/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
import {SecurityContext} from '@angular/core';

import {isPresent} from '../facade/lang';
import {Identifiers, createIdentifier} from '../identifiers';
import * as o from '../output/output_ast';
import {EMPTY_STATE as EMPTY_ANIMATION_STATE} from '../private_import_core';
import {BoundElementPropertyAst, BoundEventAst, PropertyBindingType} from '../template_parser/template_ast';

import {createEnumExpression} from './identifier_util';

export function writeToRenderer(
    view: o.Expression, boundProp: BoundElementPropertyAst, renderElement: o.Expression,
    renderValue: o.Expression, logBindingUpdate: boolean,
    securityContextExpression?: o.Expression): o.Statement[] {
  const updateStmts: o.Statement[] = [];
  const renderer = view.prop('renderer');
  renderValue = sanitizedValue(view, boundProp, renderValue, securityContextExpression);
  switch (boundProp.type) {
    case PropertyBindingType.Property:
      if (logBindingUpdate) {
        updateStmts.push(
            o.importExpr(createIdentifier(Identifiers.setBindingDebugInfo))
                .callFn([renderer, renderElement, o.literal(boundProp.name), renderValue])
                .toStmt());
      }
      updateStmts.push(
          renderer
              .callMethod(
                  'setElementProperty', [renderElement, o.literal(boundProp.name), renderValue])
              .toStmt());
      break;
    case PropertyBindingType.Attribute:
      renderValue =
          renderValue.isBlank().conditional(o.NULL_EXPR, renderValue.callMethod('toString', []));
      updateStmts.push(
          renderer
              .callMethod(
                  'setElementAttribute', [renderElement, o.literal(boundProp.name), renderValue])
              .toStmt());
      break;
    case PropertyBindingType.Class:
      updateStmts.push(
          renderer
              .callMethod(
                  'setElementClass', [renderElement, o.literal(boundProp.name), renderValue])
              .toStmt());
      break;
    case PropertyBindingType.Style:
      let strValue: o.Expression = renderValue.callMethod('toString', []);
      if (isPresent(boundProp.unit)) {
        strValue = strValue.plus(o.literal(boundProp.unit));
      }

      renderValue = renderValue.isBlank().conditional(o.NULL_EXPR, strValue);
      updateStmts.push(
          renderer
              .callMethod(
                  'setElementStyle', [renderElement, o.literal(boundProp.name), renderValue])
              .toStmt());
      break;
    case PropertyBindingType.Animation:
      throw new Error('Illegal state: Should not come here!');
  }
  return updateStmts;
}

function sanitizedValue(
    view: o.Expression, boundProp: BoundElementPropertyAst, renderValue: o.Expression,
    securityContextExpression?: o.Expression): o.Expression {
  if (boundProp.securityContext === SecurityContext.NONE) {
    return renderValue;  // No sanitization needed.
  }
  if (!boundProp.needsRuntimeSecurityContext) {
    securityContextExpression =
        createEnumExpression(Identifiers.SecurityContext, boundProp.securityContext);
  }
  if (!securityContextExpression) {
    throw new Error(`internal error, no SecurityContext given ${boundProp.name}`);
  }
  const ctx = view.prop('viewUtils').prop('sanitizer');
  const args = [securityContextExpression, renderValue];
  return ctx.callMethod('sanitize', args);
}

export function triggerAnimation(
    view: o.Expression, componentView: o.Expression, boundProp: BoundElementPropertyAst,
    boundOutputs: BoundEventAst[], eventListener: o.Expression, renderElement: o.Expression,
    renderValue: o.Expression, lastRenderValue: o.Expression) {
  const detachStmts: o.Statement[] = [];
  const updateStmts: o.Statement[] = [];

  const animationName = boundProp.name;

  const animationFnExpr =
      componentView.prop('componentType').prop('animations').key(o.literal(animationName));

  // it's important to normalize the void value as `void` explicitly
  // so that the styles data can be obtained from the stringmap
  const emptyStateValue = o.literal(EMPTY_ANIMATION_STATE);
  const unitializedValue = o.importExpr(createIdentifier(Identifiers.UNINITIALIZED));
  const animationTransitionVar = o.variable('animationTransition_' + animationName);

  updateStmts.push(
      animationTransitionVar
          .set(animationFnExpr.callFn([
            view, renderElement,
            lastRenderValue.equals(unitializedValue).conditional(emptyStateValue, lastRenderValue),
            renderValue.equals(unitializedValue).conditional(emptyStateValue, renderValue)
          ]))
          .toDeclStmt());

  detachStmts.push(
      animationTransitionVar
          .set(animationFnExpr.callFn([view, renderElement, lastRenderValue, emptyStateValue]))
          .toDeclStmt());

  const registerStmts: o.Statement[] = [];
  const animationStartMethodExists = boundOutputs.find(
      event => event.isAnimation && event.name == animationName && event.phase == 'start');
  if (animationStartMethodExists) {
    registerStmts.push(
        animationTransitionVar
            .callMethod(
                'onStart',
                [eventListener.callMethod(
                    o.BuiltinMethod.Bind,
                    [view, o.literal(BoundEventAst.calcFullName(animationName, null, 'start'))])])
            .toStmt());
  }

  const animationDoneMethodExists = boundOutputs.find(
      event => event.isAnimation && event.name == animationName && event.phase == 'done');
  if (animationDoneMethodExists) {
    registerStmts.push(
        animationTransitionVar
            .callMethod(
                'onDone',
                [eventListener.callMethod(
                    o.BuiltinMethod.Bind,
                    [view, o.literal(BoundEventAst.calcFullName(animationName, null, 'done'))])])
            .toStmt());
  }

  updateStmts.push(...registerStmts);
  detachStmts.push(...registerStmts);

  return {updateStmts, detachStmts};
}