refactor(llm): cleanup providers for future ops (closes #134) (#147)

support allow_insecure and proxy ops

Signed-off-by: Aaron Pham <contact@aarnphm.xyz>

lua/avante/providers/gemini.lua

@@ -0,0 +1,79 @@
+local Utils = require("avante.utils")
+local Config = require("avante.config")
+local P = require("avante.providers")
+
+---@class AvanteProviderFunctor
+local M = {}
+
+M.API_KEY = "GROQ_API_KEY"
+
+M.has = function()
+  return os.getenv(M.API_KEY) and true or false
+end
+
+M.parse_message = function(opts)
+  local code_prompt_obj = {
+    text = string.format("<code>```%s\n%s```</code>", opts.code_lang, opts.code_content),
+  }
+
+  if opts.selected_code_content then
+    code_prompt_obj.text = string.format("<code_context>```%s\n%s```</code_context>", opts.code_lang, opts.code_content)
+  end
+
+  -- parts ready
+  local message_content = {
+    code_prompt_obj,
+  }
+
+  if opts.selected_code_content then
+    local selected_code_obj = {
+      text = string.format("<code>```%s\n%s```</code>", opts.code_lang, opts.selected_code_content),
+    }
+
+    table.insert(message_content, selected_code_obj)
+  end
+
+  -- insert a part into parts
+  table.insert(message_content, {
+    text = string.format("<question>%s</question>", opts.question),
+  })
+
+  return {
+    systemInstruction = {
+      role = "user",
+      parts = {
+        {
+          text = opts.system_prompt .. "\n" .. opts.base_prompt,
+        },
+      },
+    },
+    contents = {
+      {
+        role = "user",
+        parts = message_content,
+      },
+    },
+  }
+end
+M.parse_response = function(data_stream, _, opts)
+  local json = vim.json.decode(data_stream)
+  opts.on_chunk(json.candidates[1].content.parts[1].text)
+end
+
+M.parse_curl_args = function(provider, code_opts)
+  local base, body_opts = P.parse_config(provider)
+
+  return {
+    url = Utils.trim(base.endpoint, { suffix = "/" })
+      .. "/"
+      .. base.model
+      .. ":streamGenerateContent?alt=sse&key="
+      .. os.getenv(M.API_KEY),
+    proxy = base.proxy,
+    insecure = base.allow_insecure,
+    headers = { ["Content-Type"] = "application/json" },
+    body = vim.tbl_deep_extend("force", {}, M.parse_message(code_opts), body_opts),
+  }
+end
+
+return M