// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/widgets.dart';

import 'colors.dart';
import 'icon.dart';
import 'ink_well.dart';
import 'theme.dart';

class DrawerItem extends StatelessComponent {
  const DrawerItem({
    Key key,
    this.icon,
    this.child,
    this.onPressed,
    this.selected: false
  }) : super(key: key);

  final String icon;
  final Widget child;
  final VoidCallback onPressed;
  final bool selected;

  ColorFilter _getIconColorFilter(ThemeData themeData) {
    if (selected) {
      if (themeData.brightness == ThemeBrightness.dark)
        return new ColorFilter.mode(themeData.accentColor, TransferMode.srcATop);
      return new ColorFilter.mode(themeData.primaryColor, TransferMode.srcATop);
    }
    return new ColorFilter.mode(Colors.black45, TransferMode.dstIn);
  }

  TextStyle _getTextStyle(ThemeData themeData) {
    TextStyle result = themeData.text.body2;
    if (selected) {
      if (themeData.brightness == ThemeBrightness.dark)
        result = result.copyWith(color: themeData.accentColor);
      else
        result = result.copyWith(color: themeData.primaryColor);
    }
    return result;
  }

  Widget build(BuildContext context) {
    ThemeData themeData = Theme.of(context);

    List<Widget> flexChildren = new List<Widget>();
    if (icon != null) {
      flexChildren.add(
        new Padding(
          padding: const EdgeDims.symmetric(horizontal: 16.0),
          child: new Icon(
            icon: icon,
            colorFilter: _getIconColorFilter(themeData)
          )
        )
      );
    }
    flexChildren.add(
      new Flexible(
        child: new Padding(
          padding: const EdgeDims.symmetric(horizontal: 16.0),
          child: new DefaultTextStyle(
            style: _getTextStyle(themeData),
            child: child
          )
        )
      )
    );

    return new Container(
      height: 48.0,
      child: new InkWell(
        onTap: onPressed,
        child: new Row(flexChildren)
      )
    );
  }

}