---@mod codetyper.autocmds Autocommands for Codetyper.nvim

local M = {}

local utils = require("codetyper.utils")

--- Autocommand group name
local AUGROUP = "Codetyper"

--- Debounce timer for tree updates
local tree_update_timer = nil
local TREE_UPDATE_DEBOUNCE_MS = 1000 -- 1 second debounce

--- Track processed prompts to avoid re-processing
---@type table<string, boolean>
local processed_prompts = {}

--- Track if we're currently asking for preferences
local asking_preference = false

--- Track if we're currently processing prompts (busy flag)
local is_processing = false

--- Track the previous mode for visual mode detection
local previous_mode = "n"

--- Debounce timer for prompt processing
local prompt_process_timer = nil
local PROMPT_PROCESS_DEBOUNCE_MS = 200 -- Wait 200ms after mode change before processing

--- Generate a unique key for a prompt
---@param bufnr number Buffer number
---@param prompt table Prompt object
---@return string Unique key
local function get_prompt_key(bufnr, prompt)
	return string.format("%d:%d:%d:%s", bufnr, prompt.start_line, prompt.end_line, prompt.content:sub(1, 50))
end

--- Schedule tree update with debounce
local function schedule_tree_update()
	if tree_update_timer then
		tree_update_timer:stop()
	end

	tree_update_timer = vim.defer_fn(function()
		local tree = require("codetyper.tree")
		tree.update_tree_log()
		tree_update_timer = nil
	end, TREE_UPDATE_DEBOUNCE_MS)
end

--- Setup autocommands
function M.setup()
	local group = vim.api.nvim_create_augroup(AUGROUP, { clear = true })

	-- Auto-check for closed prompts when leaving insert mode (works on ALL files)
	vim.api.nvim_create_autocmd("InsertLeave", {
		group = group,
		pattern = "*",
		callback = function()
			-- Skip special buffers
			local buftype = vim.bo.buftype
			if buftype ~= "" then
				return
			end
			-- Auto-save coder files only
			local filepath = vim.fn.expand("%:p")
			if utils.is_coder_file(filepath) and vim.bo.modified then
				vim.cmd("silent! write")
			end
			-- Check for closed prompts and auto-process (respects preferences)
			M.check_for_closed_prompt_with_preference()
		end,
		desc = "Check for closed prompt tags on InsertLeave",
	})

	-- Track mode changes for visual mode detection
	vim.api.nvim_create_autocmd("ModeChanged", {
		group = group,
		pattern = "*",
		callback = function(ev)
			-- Extract old mode from pattern (format: "old_mode:new_mode")
			local old_mode = ev.match:match("^(.-):")
			if old_mode then
				previous_mode = old_mode
			end
		end,
		desc = "Track previous mode for visual mode detection",
	})

	-- Auto-process prompts when entering normal mode (works on ALL files)
	vim.api.nvim_create_autocmd("ModeChanged", {
		group = group,
		pattern = "*:n",
		callback = function()
			-- Skip special buffers
			local buftype = vim.bo.buftype
			if buftype ~= "" then
				return
			end

			-- Skip if currently processing (avoid concurrent processing)
			if is_processing then
				return
			end

			-- Skip if coming from visual mode (v, V, CTRL-V) - user is still editing
			if previous_mode == "v" or previous_mode == "V" or previous_mode == "\22" then
				return
			end

			-- Cancel any pending processing timer
			if prompt_process_timer then
				prompt_process_timer:stop()
				prompt_process_timer = nil
			end

			-- Debounced processing - wait for user to truly be idle
			prompt_process_timer = vim.defer_fn(function()
				prompt_process_timer = nil
				-- Double-check we're still in normal mode
				local mode = vim.api.nvim_get_mode().mode
				if mode ~= "n" then
					return
				end
				M.check_all_prompts_with_preference()
			end, PROMPT_PROCESS_DEBOUNCE_MS)
		end,
		desc = "Auto-process closed prompts when entering normal mode",
	})

	-- Also check on CursorHold as backup (works on ALL files)
	vim.api.nvim_create_autocmd("CursorHold", {
		group = group,
		pattern = "*",
		callback = function()
			-- Skip special buffers
			local buftype = vim.bo.buftype
			if buftype ~= "" then
				return
			end
			-- Skip if currently processing
			if is_processing then
				return
			end
			local mode = vim.api.nvim_get_mode().mode
			if mode == "n" then
				M.check_all_prompts_with_preference()
			end
		end,
		desc = "Auto-process closed prompts when idle in normal mode",
	})

	-- Auto-set filetype for coder files based on extension
	vim.api.nvim_create_autocmd({ "BufRead", "BufNewFile" }, {
		group = group,
		pattern = "*.coder.*",
		callback = function()
			M.set_coder_filetype()
		end,
		desc = "Set filetype for coder files",
	})

	-- Auto-open split view when opening a coder file directly (e.g., from nvim-tree)
	vim.api.nvim_create_autocmd("BufEnter", {
		group = group,
		pattern = "*.coder.*",
		callback = function()
			-- Delay slightly to ensure buffer is fully loaded
			vim.defer_fn(function()
				M.auto_open_target_file()
			end, 50)
		end,
		desc = "Auto-open target file when coder file is opened",
	})

	-- Cleanup on buffer close
	vim.api.nvim_create_autocmd("BufWipeout", {
		group = group,
		pattern = "*.coder.*",
		callback = function(ev)
			local window = require("codetyper.window")
			if window.is_open() then
				window.close_split()
			end
			-- Clear processed prompts for this buffer
			local bufnr = ev.buf
			for key, _ in pairs(processed_prompts) do
				if key:match("^" .. bufnr .. ":") then
					processed_prompts[key] = nil
				end
			end
			-- Clear auto-opened tracking
			M.clear_auto_opened(bufnr)
		end,
		desc = "Cleanup on coder buffer close",
	})

	-- Update tree.log when files are created/written
	vim.api.nvim_create_autocmd({ "BufWritePost", "BufNewFile" }, {
		group = group,
		pattern = "*",
		callback = function(ev)
			-- Skip coder files and tree.log itself
			local filepath = ev.file or vim.fn.expand("%:p")
			if filepath:match("%.coder%.") or filepath:match("tree%.log$") then
				return
			end
			-- Skip non-project files
			if filepath:match("node_modules") or filepath:match("%.git/") or filepath:match("%.coder/") then
				return
			end
			-- Schedule tree update with debounce
			schedule_tree_update()

			-- Trigger incremental indexing if enabled
			local ok_indexer, indexer = pcall(require, "codetyper.indexer")
			if ok_indexer then
				indexer.schedule_index_file(filepath)
			end

			-- Update brain with file patterns
			local ok_brain, brain = pcall(require, "codetyper.brain")
			if ok_brain and brain.is_initialized and brain.is_initialized() then
				vim.defer_fn(function()
					M.update_brain_from_file(filepath)
				end, 500) -- Debounce brain updates
			end
		end,
		desc = "Update tree.log, index, and brain on file creation/save",
	})

	-- Update tree.log when files are deleted (via netrw or file explorer)
	vim.api.nvim_create_autocmd("BufDelete", {
		group = group,
		pattern = "*",
		callback = function(ev)
			local filepath = ev.file or ""
			-- Skip special buffers and coder files
			if filepath == "" or filepath:match("%.coder%.") or filepath:match("tree%.log$") then
				return
			end
			schedule_tree_update()
		end,
		desc = "Update tree.log on file deletion",
	})

	-- Update tree on directory change
	vim.api.nvim_create_autocmd("DirChanged", {
		group = group,
		pattern = "*",
		callback = function()
			schedule_tree_update()
		end,
		desc = "Update tree.log on directory change",
	})

	-- Shutdown brain on Vim exit
	vim.api.nvim_create_autocmd("VimLeavePre", {
		group = group,
		pattern = "*",
		callback = function()
			local ok, brain = pcall(require, "codetyper.brain")
			if ok and brain.is_initialized and brain.is_initialized() then
				brain.shutdown()
			end
		end,
		desc = "Shutdown brain and flush pending changes",
	})

	-- Auto-index: Create/open coder companion file when opening source files
	vim.api.nvim_create_autocmd("BufEnter", {
		group = group,
		pattern = "*",
		callback = function(ev)
			-- Delay to ensure buffer is fully loaded
			vim.defer_fn(function()
				M.auto_index_file(ev.buf)
			end, 100)
		end,
		desc = "Auto-index source files with coder companion",
	})
end

--- Get config with fallback defaults
local function get_config_safe()
	local codetyper = require("codetyper")
	local config = codetyper.get_config()
	-- Return defaults if not initialized
	if not config or not config.patterns then
		return {
			patterns = {
				open_tag = "/@",
				close_tag = "@/",
				file_pattern = "*.coder.*",
			},
		}
	end
	return config
end

--- Read attached files from prompt content
---@param prompt_content string Prompt content
---@param base_path string Base path to resolve relative file paths
---@return table[] attached_files List of {path, content} tables
local function read_attached_files(prompt_content, base_path)
	local parser = require("codetyper.parser")
	local file_refs = parser.extract_file_references(prompt_content)
	local attached = {}
	local cwd = vim.fn.getcwd()
	local base_dir = vim.fn.fnamemodify(base_path, ":h")

	for _, ref in ipairs(file_refs) do
		local file_path = nil

		-- Try resolving relative to cwd first
		local cwd_path = cwd .. "/" .. ref
		if utils.file_exists(cwd_path) then
			file_path = cwd_path
		else
			-- Try resolving relative to base file directory
			local rel_path = base_dir .. "/" .. ref
			if utils.file_exists(rel_path) then
				file_path = rel_path
			end
		end

		if file_path then
			local content = utils.read_file(file_path)
			if content then
				table.insert(attached, {
					path = ref,
					full_path = file_path,
					content = content,
				})
			end
		end
	end

	return attached
end

--- Check if the buffer has a newly closed prompt and auto-process (works on ANY file)
function M.check_for_closed_prompt()
	-- Skip if already processing
	if is_processing then
		return
	end
	is_processing = true

	local config = get_config_safe()
	local parser = require("codetyper.parser")

	local bufnr = vim.api.nvim_get_current_buf()
	local current_file = vim.fn.expand("%:p")

	-- Skip if no file
	if current_file == "" then
		is_processing = false
		return
	end

	-- Get current line
	local cursor = vim.api.nvim_win_get_cursor(0)
	local line = cursor[1]
	local lines = vim.api.nvim_buf_get_lines(bufnr, line - 1, line, false)

	if #lines == 0 then
		is_processing = false
		return
	end

	local current_line = lines[1]

	-- Check if line contains closing tag
	if parser.has_closing_tag(current_line, config.patterns.close_tag) then
		-- Find the complete prompt
		local prompt = parser.get_last_prompt(bufnr)
		if prompt and prompt.content and prompt.content ~= "" then
			-- Generate unique key for this prompt
			local prompt_key = get_prompt_key(bufnr, prompt)

			-- Check if already processed
			if processed_prompts[prompt_key] then
				is_processing = false
				return
			end

			-- Mark as processed
			processed_prompts[prompt_key] = true

			-- Check if scheduler is enabled
			local codetyper = require("codetyper")
			local ct_config = codetyper.get_config()
			local scheduler_enabled = ct_config and ct_config.scheduler and ct_config.scheduler.enabled

			if scheduler_enabled then
				-- Event-driven: emit to queue
				vim.schedule(function()
					local queue = require("codetyper.agent.queue")
					local patch_mod = require("codetyper.agent.patch")
					local intent_mod = require("codetyper.agent.intent")
					local scope_mod = require("codetyper.agent.scope")
					local logs_panel = require("codetyper.logs_panel")

					-- Open logs panel to show progress
					logs_panel.ensure_open()

					-- Take buffer snapshot
					local snapshot = patch_mod.snapshot_buffer(bufnr, {
						start_line = prompt.start_line,
						end_line = prompt.end_line,
					})

					-- Get target path - for coder files, get the target; for regular files, use self
					local target_path
					if utils.is_coder_file(current_file) then
						target_path = utils.get_target_path(current_file)
					else
						target_path = current_file
					end

					-- Read attached files before cleaning
					local attached_files = read_attached_files(prompt.content, current_file)

					-- Clean prompt content (strip file references)
					local cleaned = parser.clean_prompt(parser.strip_file_references(prompt.content))

					-- Check if we're working from a coder file
					local is_from_coder_file = utils.is_coder_file(current_file)

					-- Resolve scope in target file FIRST (need it to adjust intent)
					-- Only resolve scope if NOT from coder file (line numbers don't apply)
					local target_bufnr = vim.fn.bufnr(target_path)
					local scope = nil
					local scope_text = nil
					local scope_range = nil

					if not is_from_coder_file then
						-- Prompt is in the actual source file, use line position for scope
						if target_bufnr == -1 then
							target_bufnr = bufnr
						end
						scope = scope_mod.resolve_scope(target_bufnr, prompt.start_line, 1)
						if scope and scope.type ~= "file" then
							scope_text = scope.text
							scope_range = {
								start_line = scope.range.start_row,
								end_line = scope.range.end_row,
							}
						end
					else
						-- Prompt is in coder file - load target if needed, but don't use scope
						-- Code from coder files should append to target by default
						if target_bufnr == -1 then
							target_bufnr = vim.fn.bufadd(target_path)
							if target_bufnr ~= 0 then
								vim.fn.bufload(target_bufnr)
							end
						end
					end

					-- Detect intent from prompt
					local intent = intent_mod.detect(cleaned)

					-- IMPORTANT: If prompt is inside a function/method and intent is "add",
					-- override to "complete" since we're completing the function body
					-- But NOT for coder files - they should use "add/append" by default
					if not is_from_coder_file and scope and (scope.type == "function" or scope.type == "method") then
						if intent.type == "add" or intent.action == "insert" or intent.action == "append" then
							-- Override to complete the function instead of adding new code
							intent = {
								type = "complete",
								scope_hint = "function",
								confidence = intent.confidence,
								action = "replace",
								keywords = intent.keywords,
							}
						end
					end

					-- For coder files, default to "add" with "append" action
					if is_from_coder_file and (intent.action == "replace" or intent.type == "complete") then
						intent = {
							type = intent.type == "complete" and "add" or intent.type,
							confidence = intent.confidence,
							action = "append",
							keywords = intent.keywords,
						}
					end

					-- Determine priority based on intent
					local priority = 2 -- Normal
					if intent.type == "fix" or intent.type == "complete" then
						priority = 1 -- High priority for fixes and completions
					elseif intent.type == "test" or intent.type == "document" then
						priority = 3 -- Lower priority for tests and docs
					end

					-- Enqueue the event
					queue.enqueue({
						id = queue.generate_id(),
						bufnr = bufnr,
						range = { start_line = prompt.start_line, end_line = prompt.end_line },
						timestamp = os.clock(),
						changedtick = snapshot.changedtick,
						content_hash = snapshot.content_hash,
						prompt_content = cleaned,
						target_path = target_path,
						priority = priority,
						status = "pending",
						attempt_count = 0,
						intent = intent,
						scope = scope,
						scope_text = scope_text,
						scope_range = scope_range,
						attached_files = attached_files,
					})

					local scope_info = scope
							and scope.type ~= "file"
							and string.format(" [%s: %s]", scope.type, scope.name or "anonymous")
						or ""
					utils.notify(string.format("Prompt queued: %s%s", intent.type, scope_info), vim.log.levels.INFO)
				end)
			else
				-- Legacy: direct processing
				utils.notify("Processing prompt...", vim.log.levels.INFO)
				vim.schedule(function()
					vim.cmd("CoderProcess")
				end)
			end
		end
	end
	is_processing = false
end

--- Process a single prompt through the scheduler
--- This is the core processing logic used by both automatic and manual modes
---@param bufnr number Buffer number
---@param prompt table Prompt object with start_line, end_line, content
---@param current_file string Current file path
---@param skip_processed_check? boolean Skip the processed check (for manual mode)
function M.process_single_prompt(bufnr, prompt, current_file, skip_processed_check)
	local parser = require("codetyper.parser")
	local scheduler = require("codetyper.agent.scheduler")

	if not prompt.content or prompt.content == "" then
		return
	end

	-- Ensure scheduler is running
	if not scheduler.status().running then
		scheduler.start()
	end

	-- Generate unique key for this prompt
	local prompt_key = get_prompt_key(bufnr, prompt)

	-- Skip if already processed (unless overridden for manual mode)
	if not skip_processed_check and processed_prompts[prompt_key] then
		return
	end

	-- Mark as processed
	processed_prompts[prompt_key] = true

	-- Process this prompt
	vim.schedule(function()
		local queue = require("codetyper.agent.queue")
		local patch_mod = require("codetyper.agent.patch")
		local intent_mod = require("codetyper.agent.intent")
		local scope_mod = require("codetyper.agent.scope")
		local logs_panel = require("codetyper.logs_panel")

		-- Open logs panel to show progress
		logs_panel.ensure_open()

		-- Take buffer snapshot
		local snapshot = patch_mod.snapshot_buffer(bufnr, {
			start_line = prompt.start_line,
			end_line = prompt.end_line,
		})

		-- Get target path - for coder files, get the target; for regular files, use self
		local target_path
		local is_from_coder_file = utils.is_coder_file(current_file)
		if is_from_coder_file then
			target_path = utils.get_target_path(current_file)
		else
			target_path = current_file
		end

		-- Read attached files before cleaning
		local attached_files = read_attached_files(prompt.content, current_file)

		-- Clean prompt content (strip file references)
		local cleaned = parser.clean_prompt(parser.strip_file_references(prompt.content))

		-- Resolve scope in target file FIRST (need it to adjust intent)
		-- Only resolve scope if NOT from coder file (line numbers don't apply)
		local target_bufnr = vim.fn.bufnr(target_path)
		local scope = nil
		local scope_text = nil
		local scope_range = nil

		if not is_from_coder_file then
			-- Prompt is in the actual source file, use line position for scope
			if target_bufnr == -1 then
				target_bufnr = bufnr
			end
			scope = scope_mod.resolve_scope(target_bufnr, prompt.start_line, 1)
			if scope and scope.type ~= "file" then
				scope_text = scope.text
				scope_range = {
					start_line = scope.range.start_row,
					end_line = scope.range.end_row,
				}
			end
		else
			-- Prompt is in coder file - load target if needed
			if target_bufnr == -1 then
				target_bufnr = vim.fn.bufadd(target_path)
				if target_bufnr ~= 0 then
					vim.fn.bufload(target_bufnr)
				end
			end
		end

		-- Detect intent from prompt
		local intent = intent_mod.detect(cleaned)

		-- IMPORTANT: If prompt is inside a function/method and intent is "add",
		-- override to "complete" since we're completing the function body
		-- But NOT for coder files - they should use "add/append" by default
		if not is_from_coder_file and scope and (scope.type == "function" or scope.type == "method") then
			if intent.type == "add" or intent.action == "insert" or intent.action == "append" then
				-- Override to complete the function instead of adding new code
				intent = {
					type = "complete",
					scope_hint = "function",
					confidence = intent.confidence,
					action = "replace",
					keywords = intent.keywords,
				}
			end
		end

		-- For coder files, default to "add" with "append" action
		if is_from_coder_file and (intent.action == "replace" or intent.type == "complete") then
			intent = {
				type = intent.type == "complete" and "add" or intent.type,
				confidence = intent.confidence,
				action = "append",
				keywords = intent.keywords,
			}
		end

		-- Determine priority based on intent
		local priority = 2
		if intent.type == "fix" or intent.type == "complete" then
			priority = 1
		elseif intent.type == "test" or intent.type == "document" then
			priority = 3
		end

		-- Enqueue the event
		queue.enqueue({
			id = queue.generate_id(),
			bufnr = bufnr,
			range = { start_line = prompt.start_line, end_line = prompt.end_line },
			timestamp = os.clock(),
			changedtick = snapshot.changedtick,
			content_hash = snapshot.content_hash,
			prompt_content = cleaned,
			target_path = target_path,
			priority = priority,
			status = "pending",
			attempt_count = 0,
			intent = intent,
			scope = scope,
			scope_text = scope_text,
			scope_range = scope_range,
			attached_files = attached_files,
		})

		local scope_info = scope
				and scope.type ~= "file"
				and string.format(" [%s: %s]", scope.type, scope.name or "anonymous")
			or ""
		utils.notify(string.format("Prompt queued: %s%s", intent.type, scope_info), vim.log.levels.INFO)
	end)
end

--- Check and process all closed prompts in the buffer (works on ANY file)
function M.check_all_prompts()
	local parser = require("codetyper.parser")
	local bufnr = vim.api.nvim_get_current_buf()
	local current_file = vim.fn.expand("%:p")

	-- Skip if no file
	if current_file == "" then
		return
	end

	-- Find all prompts in buffer
	local prompts = parser.find_prompts_in_buffer(bufnr)

	if #prompts == 0 then
		return
	end

	-- Check if scheduler is enabled
	local codetyper = require("codetyper")
	local ct_config = codetyper.get_config()
	local scheduler_enabled = ct_config and ct_config.scheduler and ct_config.scheduler.enabled

	if not scheduler_enabled then
		return
	end

	for _, prompt in ipairs(prompts) do
		M.process_single_prompt(bufnr, prompt, current_file)
	end
end

--- Check for closed prompt with preference check
--- If user hasn't chosen auto/manual mode, ask them first
function M.check_for_closed_prompt_with_preference()
	local preferences = require("codetyper.preferences")
	local parser = require("codetyper.parser")

	-- First check if there are any prompts to process
	local bufnr = vim.api.nvim_get_current_buf()
	local prompts = parser.find_prompts_in_buffer(bufnr)
	if #prompts == 0 then
		return
	end

	-- Check user preference
	local auto_process = preferences.is_auto_process_enabled()

	if auto_process == nil then
		-- Not yet decided - ask the user (but only once per session)
		if not asking_preference then
			asking_preference = true
			preferences.ask_auto_process_preference(function(enabled)
				asking_preference = false
				if enabled then
					-- User chose automatic - process now
					M.check_for_closed_prompt()
				else
					-- User chose manual - show hint
					utils.notify("Use :CoderProcess to process prompt tags manually", vim.log.levels.INFO)
				end
			end)
		end
		return
	end

	if auto_process then
		-- Automatic mode - process prompts
		M.check_for_closed_prompt()
	end
	-- Manual mode - do nothing, user will run :CoderProcess
end

--- Check all prompts with preference check
function M.check_all_prompts_with_preference()
	local preferences = require("codetyper.preferences")
	local parser = require("codetyper.parser")

	-- First check if there are any prompts to process
	local bufnr = vim.api.nvim_get_current_buf()
	local prompts = parser.find_prompts_in_buffer(bufnr)
	if #prompts == 0 then
		return
	end

	-- Check if any prompts are unprocessed
	local has_unprocessed = false
	for _, prompt in ipairs(prompts) do
		local prompt_key = get_prompt_key(bufnr, prompt)
		if not processed_prompts[prompt_key] then
			has_unprocessed = true
			break
		end
	end

	if not has_unprocessed then
		return
	end

	-- Check user preference
	local auto_process = preferences.is_auto_process_enabled()

	if auto_process == nil then
		-- Not yet decided - ask the user (but only once per session)
		if not asking_preference then
			asking_preference = true
			preferences.ask_auto_process_preference(function(enabled)
				asking_preference = false
				if enabled then
					-- User chose automatic - process now
					M.check_all_prompts()
				else
					-- User chose manual - show hint
					utils.notify("Use :CoderProcess to process prompt tags manually", vim.log.levels.INFO)
				end
			end)
		end
		return
	end

	if auto_process then
		-- Automatic mode - process prompts
		M.check_all_prompts()
	end
	-- Manual mode - do nothing, user will run :CoderProcess
end

--- Reset processed prompts for a buffer (useful for re-processing)
---@param bufnr? number Buffer number (default: current)
---@param silent? boolean Suppress notification (default: false)
function M.reset_processed(bufnr, silent)
	bufnr = bufnr or vim.api.nvim_get_current_buf()
	for key, _ in pairs(processed_prompts) do
		if key:match("^" .. bufnr .. ":") then
			processed_prompts[key] = nil
		end
	end
	if not silent then
		utils.notify("Prompt history cleared - prompts can be re-processed")
	end
end

--- Track if we already opened the split for this buffer
---@type table<number, boolean>
local auto_opened_buffers = {}

--- Auto-open target file when a coder file is opened directly
function M.auto_open_target_file()
	local window = require("codetyper.window")

	-- Skip if split is already open
	if window.is_open() then
		return
	end

	local bufnr = vim.api.nvim_get_current_buf()

	-- Skip if we already handled this buffer
	if auto_opened_buffers[bufnr] then
		return
	end

	local current_file = vim.fn.expand("%:p")

	-- Skip empty paths
	if not current_file or current_file == "" then
		return
	end

	-- Verify it's a coder file
	if not utils.is_coder_file(current_file) then
		return
	end

	-- Skip if we're in a special buffer (nvim-tree, etc.)
	local buftype = vim.bo[bufnr].buftype
	if buftype ~= "" then
		return
	end

	-- Mark as handled
	auto_opened_buffers[bufnr] = true

	-- Get the target file path
	local target_path = utils.get_target_path(current_file)

	-- Check if target file exists
	if not utils.file_exists(target_path) then
		utils.notify("Target file not found: " .. vim.fn.fnamemodify(target_path, ":t"), vim.log.levels.WARN)
		return
	end

	-- Get config with fallback defaults
	local codetyper = require("codetyper")
	local config = codetyper.get_config()

	-- Fallback width if config not fully loaded (percentage, e.g., 25 = 25%)
	local width_pct = (config and config.window and config.window.width) or 25
	local width = math.ceil(vim.o.columns * (width_pct / 100))

	-- Store current coder window
	local coder_win = vim.api.nvim_get_current_win()
	local coder_buf = bufnr

	-- Open target file in a vertical split on the right
	local ok, err = pcall(function()
		vim.cmd("vsplit " .. vim.fn.fnameescape(target_path))
	end)

	if not ok then
		utils.notify("Failed to open target file: " .. tostring(err), vim.log.levels.ERROR)
		auto_opened_buffers[bufnr] = nil -- Allow retry
		return
	end

	-- Now we're in the target window (right side)
	local target_win = vim.api.nvim_get_current_win()
	local target_buf = vim.api.nvim_get_current_buf()

	-- Set the coder window width (left side)
	pcall(vim.api.nvim_win_set_width, coder_win, width)

	-- Update window module state
	window._coder_win = coder_win
	window._coder_buf = coder_buf
	window._target_win = target_win
	window._target_buf = target_buf

	-- Set up window options for coder window
	pcall(function()
		vim.wo[coder_win].number = true
		vim.wo[coder_win].relativenumber = true
		vim.wo[coder_win].signcolumn = "yes"
	end)

	utils.notify("Opened target: " .. vim.fn.fnamemodify(target_path, ":t"))
end

--- Clear auto-opened tracking for a buffer
---@param bufnr number Buffer number
function M.clear_auto_opened(bufnr)
	auto_opened_buffers[bufnr] = nil
end

--- Set appropriate filetype for coder files
function M.set_coder_filetype()
	local filepath = vim.fn.expand("%:p")

	-- Extract the actual extension (e.g., index.coder.ts -> ts)
	local ext = filepath:match("%.coder%.(%w+)$")

	if ext then
		-- Map extension to filetype
		local ft_map = {
			ts = "typescript",
			tsx = "typescriptreact",
			js = "javascript",
			jsx = "javascriptreact",
			py = "python",
			lua = "lua",
			go = "go",
			rs = "rust",
			rb = "ruby",
			java = "java",
			c = "c",
			cpp = "cpp",
			cs = "cs",
			json = "json",
			yaml = "yaml",
			yml = "yaml",
			md = "markdown",
			html = "html",
			css = "css",
			scss = "scss",
			vue = "vue",
			svelte = "svelte",
		}

		local filetype = ft_map[ext] or ext
		vim.bo.filetype = filetype
	end
end

--- Clear all autocommands
function M.clear()
	vim.api.nvim_del_augroup_by_name(AUGROUP)
end

--- Debounce timers for brain updates per file
---@type table<string, uv_timer_t>
local brain_update_timers = {}

--- Update brain with patterns from a file
---@param filepath string
function M.update_brain_from_file(filepath)
	local ok_brain, brain = pcall(require, "codetyper.brain")
	if not ok_brain or not brain.is_initialized() then
		return
	end

	-- Read file content
	local content = utils.read_file(filepath)
	if not content or content == "" then
		return
	end

	local ext = vim.fn.fnamemodify(filepath, ":e")
	local lines = vim.split(content, "\n")

	-- Extract key patterns from the file
	local functions = {}
	local classes = {}
	local imports = {}

	for i, line in ipairs(lines) do
		-- Functions
		local func = line:match("^%s*function%s+([%w_:%.]+)%s*%(")
			or line:match("^%s*local%s+function%s+([%w_]+)%s*%(")
			or line:match("^%s*def%s+([%w_]+)%s*%(")
			or line:match("^%s*func%s+([%w_]+)%s*%(")
			or line:match("^%s*async%s+function%s+([%w_]+)%s*%(")
			or line:match("^%s*public%s+.*%s+([%w_]+)%s*%(")
			or line:match("^%s*private%s+.*%s+([%w_]+)%s*%(")
		if func then
			table.insert(functions, { name = func, line = i })
		end

		-- Classes
		local class = line:match("^%s*class%s+([%w_]+)")
			or line:match("^%s*public%s+class%s+([%w_]+)")
			or line:match("^%s*interface%s+([%w_]+)")
			or line:match("^%s*struct%s+([%w_]+)")
		if class then
			table.insert(classes, { name = class, line = i })
		end

		-- Imports
		local imp = line:match("import%s+.*%s+from%s+[\"']([^\"']+)[\"']")
			or line:match("require%([\"']([^\"']+)[\"']%)")
			or line:match("from%s+([%w_.]+)%s+import")
		if imp then
			table.insert(imports, imp)
		end
	end

	-- Only store if file has meaningful content
	if #functions == 0 and #classes == 0 then
		return
	end

	-- Build summary
	local parts = {}
	if #functions > 0 then
		local func_names = {}
		for i, f in ipairs(functions) do
			if i <= 5 then
				table.insert(func_names, f.name)
			end
		end
		table.insert(parts, "functions: " .. table.concat(func_names, ", "))
	end
	if #classes > 0 then
		local class_names = {}
		for _, c in ipairs(classes) do
			table.insert(class_names, c.name)
		end
		table.insert(parts, "classes: " .. table.concat(class_names, ", "))
	end

	local summary = vim.fn.fnamemodify(filepath, ":t") .. " - " .. table.concat(parts, "; ")

	-- Learn this pattern - use "pattern_detected" type to match the pattern learner
	brain.learn({
		type = "pattern_detected",
		file = filepath,
		timestamp = os.time(),
		data = {
			name = summary,
			description = #functions .. " functions, " .. #classes .. " classes",
			language = ext,
			symbols = vim.tbl_map(function(f) return f.name end, functions),
			example = nil,
		},
	})
end

--- Track buffers that have been auto-indexed
---@type table<number, boolean>
local auto_indexed_buffers = {}

--- Supported file extensions for auto-indexing
local supported_extensions = {
	"ts",
	"tsx",
	"js",
	"jsx",
	"py",
	"lua",
	"go",
	"rs",
	"rb",
	"java",
	"c",
	"cpp",
	"cs",
	"json",
	"yaml",
	"yml",
	"md",
	"html",
	"css",
	"scss",
	"vue",
	"svelte",
	"php",
	"sh",
	"zsh",
}

--- Check if extension is supported
---@param ext string File extension
---@return boolean
local function is_supported_extension(ext)
	for _, supported in ipairs(supported_extensions) do
		if ext == supported then
			return true
		end
	end
	return false
end

--- Auto-index a file by creating/opening its coder companion
---@param bufnr number Buffer number
--- Directories to ignore for coder file creation
local ignored_directories = {
	".git",
	".coder",
	".claude",
	".vscode",
	".idea",
	"node_modules",
	"vendor",
	"dist",
	"build",
	"target",
	"__pycache__",
	".cache",
	".npm",
	".yarn",
	"coverage",
	".next",
	".nuxt",
	".svelte-kit",
	"out",
	"bin",
	"obj",
}

--- Files to ignore for coder file creation (exact names or patterns)
local ignored_files = {
	-- Git files
	".gitignore",
	".gitattributes",
	".gitmodules",
	-- Lock files
	"package-lock.json",
	"yarn.lock",
	"pnpm-lock.yaml",
	"Cargo.lock",
	"Gemfile.lock",
	"poetry.lock",
	"composer.lock",
	-- Config files that don't need coder companions
	".env",
	".env.local",
	".env.development",
	".env.production",
	".eslintrc",
	".eslintrc.json",
	".prettierrc",
	".prettierrc.json",
	".editorconfig",
	".dockerignore",
	"Dockerfile",
	"docker-compose.yml",
	"docker-compose.yaml",
	".npmrc",
	".yarnrc",
	".nvmrc",
	"tsconfig.json",
	"jsconfig.json",
	"babel.config.js",
	"webpack.config.js",
	"vite.config.js",
	"rollup.config.js",
	"jest.config.js",
	"vitest.config.js",
	".stylelintrc",
	"tailwind.config.js",
	"postcss.config.js",
	-- Other non-code files
	"README.md",
	"CHANGELOG.md",
	"LICENSE",
	"LICENSE.md",
	"CONTRIBUTING.md",
	"Makefile",
	"CMakeLists.txt",
}

--- Check if a file path contains an ignored directory
---@param filepath string Full file path
---@return boolean
local function is_in_ignored_directory(filepath)
	for _, dir in ipairs(ignored_directories) do
		-- Check for /dirname/ or /dirname at end
		if filepath:match("/" .. dir .. "/") or filepath:match("/" .. dir .. "$") then
			return true
		end
		-- Also check for dirname/ at start (relative paths)
		if filepath:match("^" .. dir .. "/") then
			return true
		end
	end
	return false
end

--- Check if a file should be ignored for coder companion creation
---@param filepath string Full file path
---@return boolean
local function should_ignore_for_coder(filepath)
	local filename = vim.fn.fnamemodify(filepath, ":t")

	-- Check exact filename matches
	for _, ignored in ipairs(ignored_files) do
		if filename == ignored then
			return true
		end
	end

	-- Check if file starts with dot (hidden/config files)
	if filename:match("^%.") then
		return true
	end

	-- Check if in ignored directory
	if is_in_ignored_directory(filepath) then
		return true
	end

	return false
end

function M.auto_index_file(bufnr)
	-- Skip if buffer is invalid
	if not vim.api.nvim_buf_is_valid(bufnr) then
		return
	end

	-- Skip if already indexed
	if auto_indexed_buffers[bufnr] then
		return
	end

	-- Get file path
	local filepath = vim.api.nvim_buf_get_name(bufnr)
	if not filepath or filepath == "" then
		return
	end

	-- Skip coder files
	if utils.is_coder_file(filepath) then
		return
	end

	-- Skip special buffers
	local buftype = vim.bo[bufnr].buftype
	if buftype ~= "" then
		return
	end

	-- Skip unsupported file types
	local ext = vim.fn.fnamemodify(filepath, ":e")
	if ext == "" or not is_supported_extension(ext) then
		return
	end

	-- Skip ignored directories and files (node_modules, .git, config files, etc.)
	if should_ignore_for_coder(filepath) then
		return
	end

	-- Skip if auto_index is disabled in config
	local codetyper = require("codetyper")
	local config = codetyper.get_config()
	if config and config.auto_index == false then
		return
	end

	-- Mark as indexed
	auto_indexed_buffers[bufnr] = true

	-- Get coder companion path
	local coder_path = utils.get_coder_path(filepath)

	-- Check if coder file already exists
	local coder_exists = utils.file_exists(coder_path)

	-- Create coder file with pseudo-code context if it doesn't exist
	if not coder_exists then
		local filename = vim.fn.fnamemodify(filepath, ":t")
		local ext = vim.fn.fnamemodify(filepath, ":e")

		-- Determine comment style based on extension
		local comment_prefix = "--"
		local comment_block_start = "--[["
		local comment_block_end = "]]"
		if ext == "ts" or ext == "tsx" or ext == "js" or ext == "jsx" or ext == "java" or ext == "c" or ext == "cpp" or ext == "cs" or ext == "go" or ext == "rs" then
			comment_prefix = "//"
			comment_block_start = "/*"
			comment_block_end = "*/"
		elseif ext == "py" or ext == "rb" or ext == "yaml" or ext == "yml" then
			comment_prefix = "#"
			comment_block_start = '"""'
			comment_block_end = '"""'
		end

		-- Read target file to analyze its structure
		local content = ""
		pcall(function()
			local lines = vim.fn.readfile(filepath)
			if lines then
				content = table.concat(lines, "\n")
			end
		end)

		-- Extract structure from the file
		local functions = extract_functions(content, ext)
		local classes = extract_classes(content, ext)
		local imports = extract_imports(content, ext)

		-- Build pseudo-code context
		local pseudo_code = {}

		-- Header
		table.insert(pseudo_code, comment_prefix .. " ═══════════════════════════════════════════════════════════")
		table.insert(pseudo_code, comment_prefix .. " CODER COMPANION: " .. filename)
		table.insert(pseudo_code, comment_prefix .. " ═══════════════════════════════════════════════════════════")
		table.insert(pseudo_code, comment_prefix .. " This file describes the business logic and behavior of " .. filename)
		table.insert(pseudo_code, comment_prefix .. " Edit this pseudo-code to guide code generation.")
		table.insert(pseudo_code, comment_prefix .. " Use /@ @/ tags for specific generation requests.")
		table.insert(pseudo_code, comment_prefix .. "")

		-- Module purpose
		table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
		table.insert(pseudo_code, comment_prefix .. " MODULE PURPOSE:")
		table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
		table.insert(pseudo_code, comment_prefix .. " TODO: Describe what this module/file is responsible for")
		table.insert(pseudo_code, comment_prefix .. " Example: \"Handles user authentication and session management\"")
		table.insert(pseudo_code, comment_prefix .. "")

		-- Dependencies section
		if #imports > 0 then
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			table.insert(pseudo_code, comment_prefix .. " DEPENDENCIES:")
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			for _, imp in ipairs(imports) do
				table.insert(pseudo_code, comment_prefix .. " • " .. imp)
			end
			table.insert(pseudo_code, comment_prefix .. "")
		end

		-- Classes section
		if #classes > 0 then
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			table.insert(pseudo_code, comment_prefix .. " CLASSES:")
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			for _, class in ipairs(classes) do
				table.insert(pseudo_code, comment_prefix .. "")
				table.insert(pseudo_code, comment_prefix .. " class " .. class.name .. ":")
				table.insert(pseudo_code, comment_prefix .. "   PURPOSE: TODO - describe what this class represents")
				table.insert(pseudo_code, comment_prefix .. "   RESPONSIBILITIES:")
				table.insert(pseudo_code, comment_prefix .. "     - TODO: list main responsibilities")
			end
			table.insert(pseudo_code, comment_prefix .. "")
		end

		-- Functions section
		if #functions > 0 then
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			table.insert(pseudo_code, comment_prefix .. " FUNCTIONS:")
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			for _, func in ipairs(functions) do
				table.insert(pseudo_code, comment_prefix .. "")
				table.insert(pseudo_code, comment_prefix .. " " .. func.name .. "():")
				table.insert(pseudo_code, comment_prefix .. "   PURPOSE: TODO - what does this function do?")
				table.insert(pseudo_code, comment_prefix .. "   INPUTS: TODO - describe parameters")
				table.insert(pseudo_code, comment_prefix .. "   OUTPUTS: TODO - describe return value")
				table.insert(pseudo_code, comment_prefix .. "   BEHAVIOR:")
				table.insert(pseudo_code, comment_prefix .. "     - TODO: describe step-by-step logic")
			end
			table.insert(pseudo_code, comment_prefix .. "")
		end

		-- If empty file, provide starter template
		if #functions == 0 and #classes == 0 then
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			table.insert(pseudo_code, comment_prefix .. " PLANNED STRUCTURE:")
			table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
			table.insert(pseudo_code, comment_prefix .. " TODO: Describe what you want to build in this file")
			table.insert(pseudo_code, comment_prefix .. "")
			table.insert(pseudo_code, comment_prefix .. " Example pseudo-code:")
			table.insert(pseudo_code, comment_prefix .. " /@")
			table.insert(pseudo_code, comment_prefix .. " Create a module that:")
			table.insert(pseudo_code, comment_prefix .. " 1. Exports a main function")
			table.insert(pseudo_code, comment_prefix .. " 2. Handles errors gracefully")
			table.insert(pseudo_code, comment_prefix .. " 3. Returns structured data")
			table.insert(pseudo_code, comment_prefix .. " @/")
			table.insert(pseudo_code, comment_prefix .. "")
		end

		-- Business rules section
		table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
		table.insert(pseudo_code, comment_prefix .. " BUSINESS RULES:")
		table.insert(pseudo_code, comment_prefix .. " ─────────────────────────────────────────────────────────────")
		table.insert(pseudo_code, comment_prefix .. " TODO: Document any business rules, constraints, or requirements")
		table.insert(pseudo_code, comment_prefix .. " Example:")
		table.insert(pseudo_code, comment_prefix .. "   - Users must be authenticated before accessing this feature")
		table.insert(pseudo_code, comment_prefix .. "   - Data must be validated before saving")
		table.insert(pseudo_code, comment_prefix .. "   - Errors should be logged but not exposed to users")
		table.insert(pseudo_code, comment_prefix .. "")

		-- Footer with generation tags example
		table.insert(pseudo_code, comment_prefix .. " ═══════════════════════════════════════════════════════════")
		table.insert(pseudo_code, comment_prefix .. " Use /@ @/ tags below to request code generation:")
		table.insert(pseudo_code, comment_prefix .. " ═══════════════════════════════════════════════════════════")
		table.insert(pseudo_code, "")

		utils.write_file(coder_path, table.concat(pseudo_code, "\n"))
	end

	-- Notify user about the coder companion
	local coder_filename = vim.fn.fnamemodify(coder_path, ":t")
	if coder_exists then
		utils.notify("Coder companion available: " .. coder_filename, vim.log.levels.DEBUG)
	else
		utils.notify("Created coder companion: " .. coder_filename, vim.log.levels.INFO)
	end
end

--- Open the coder companion for the current file
---@param open_split? boolean Whether to open in split view (default: true)
function M.open_coder_companion(open_split)
	open_split = open_split ~= false -- Default to true

	local filepath = vim.fn.expand("%:p")
	if not filepath or filepath == "" then
		utils.notify("No file open", vim.log.levels.WARN)
		return
	end

	if utils.is_coder_file(filepath) then
		utils.notify("Already in coder file", vim.log.levels.INFO)
		return
	end

	local coder_path = utils.get_coder_path(filepath)

	-- Create if it doesn't exist
	if not utils.file_exists(coder_path) then
		local filename = vim.fn.fnamemodify(filepath, ":t")
		local ext = vim.fn.fnamemodify(filepath, ":e")
		local comment_prefix = "--"
		if vim.tbl_contains({ "js", "jsx", "ts", "tsx", "java", "c", "cpp", "cs", "go", "rs", "php" }, ext) then
			comment_prefix = "//"
		elseif vim.tbl_contains({ "py", "sh", "zsh", "yaml", "yml" }, ext) then
			comment_prefix = "#"
		elseif vim.tbl_contains({ "html", "md" }, ext) then
			comment_prefix = "<!--"
		end

		local close_comment = comment_prefix == "<!--" and " -->" or ""
		local template = string.format(
			[[%s Coder companion for %s%s
%s Use /@ @/ tags to write pseudo-code prompts%s
%s Example:%s
%s /@%s
%s Add a function that validates user input%s
%s - Check for empty strings%s
%s - Validate email format%s
%s @/%s

]],
			comment_prefix,
			filename,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment,
			comment_prefix,
			close_comment
		)
		utils.write_file(coder_path, template)
	end

	if open_split then
		-- Use the window module to open split view
		local window = require("codetyper.window")
		window.open_split(coder_path, filepath)
	else
		-- Just open the coder file
		vim.cmd("edit " .. vim.fn.fnameescape(coder_path))
	end
end

--- Clear auto-indexed tracking for a buffer
---@param bufnr number Buffer number
function M.clear_auto_indexed(bufnr)
	auto_indexed_buffers[bufnr] = nil
end

return M