import 'dart:math';

import 'package:fl_lib/fl_lib.dart';
import 'package:flutter/material.dart';
import 'package:re_editor/re_editor.dart';

const EdgeInsetsGeometry _kDefaultFindMargin = EdgeInsets.only(right: 10);
const double _kDefaultFindPanelWidth = 360;
const double _kDefaultFindPanelHeight = 36;
const double _kDefaultReplacePanelHeight = _kDefaultFindPanelHeight * 2;
const double _kDefaultFindIconSize = 16;
const double _kDefaultFindIconWidth = 30;
const double _kDefaultFindIconHeight = 30;
const double _kDefaultFindInputFontSize = 13;
const double _kDefaultFindResultFontSize = 12;
const EdgeInsetsGeometry _kDefaultFindPadding = EdgeInsets.only(left: 5, right: 5, top: 2.5, bottom: 2.5);
const EdgeInsetsGeometry _kDefaultFindInputContentPadding = EdgeInsets.only(left: 5, right: 5);

class CodeFindPanelView extends StatelessWidget implements PreferredSizeWidget {
  final CodeFindController controller;
  final EdgeInsetsGeometry margin;
  final bool readOnly;
  final Color? iconColor;
  final Color? iconSelectedColor;
  final double iconSize;
  final double inputFontSize;
  final double resultFontSize;
  final Color? inputTextColor;
  final Color? resultFontColor;
  final EdgeInsetsGeometry padding;
  final InputDecoration decoration;

  const CodeFindPanelView({
    super.key,
    required this.controller,
    this.margin = _kDefaultFindMargin,
    required this.readOnly,
    this.iconSelectedColor,
    this.iconColor,
    this.iconSize = _kDefaultFindIconSize,
    this.inputFontSize = _kDefaultFindInputFontSize,
    this.resultFontSize = _kDefaultFindResultFontSize,
    this.inputTextColor,
    this.resultFontColor,
    this.padding = _kDefaultFindPadding,
    this.decoration = const InputDecoration(
      filled: true,
      contentPadding: _kDefaultFindInputContentPadding,
      border: OutlineInputBorder(borderRadius: BorderRadius.all(Radius.circular(0)), gapPadding: 0),
    ),
  });

  @override
  Size get preferredSize {
    final value = controller.value;
    final height = value == null
        ? 0.0
        : (value.replaceMode ? _kDefaultReplacePanelHeight : _kDefaultFindPanelHeight) + margin.vertical;
    return Size(double.infinity, height);
  }

  @override
  Widget build(BuildContext context) {
    if (controller.value == null) return UIs.placeholder;

    return Container(
      margin: margin,
      alignment: Alignment.topRight,
      height: preferredSize.height,
      child: SingleChildScrollView(
        scrollDirection: Axis.horizontal,
        child: SizedBox(
          width: _kDefaultFindPanelWidth,
          child: Column(
            children: [
              _buildFindInputView(context),
              if (controller.value!.replaceMode) _buildReplaceInputView(context),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildFindInputView(BuildContext context) {
    final CodeFindValue value = controller.value!;
    final String result;
    if (value.result == null) {
      result = libL10n.empty;
    } else {
      final index = value.result?.index;
      final count = value.result?.matches.length;
      result = '$index/$count';
    }
    return Row(
      children: [
        SizedBox(
            width: _kDefaultFindPanelWidth / 1.75,
            height: _kDefaultFindPanelHeight,
            child: Stack(
              alignment: Alignment.center,
              children: [
                _buildTextField(
                  context: context,
                  controller: controller.findInputController,
                  focusNode: controller.findInputFocusNode,
                  iconsWidth: _kDefaultFindIconWidth * 1.5,
                ),
                Row(
                  mainAxisAlignment: MainAxisAlignment.end,
                  children: [
                    _buildCheckText(
                      context: context,
                      text: 'Aa',
                      checked: value.option.caseSensitive,
                      onPressed: controller.toggleCaseSensitive,
                    ),
                    _buildCheckText(
                      context: context,
                      text: '.*',
                      checked: value.option.regex,
                      onPressed: controller.toggleRegex,
                    )
                  ],
                )
              ],
            )),
        Text(result, style: TextStyle(color: resultFontColor, fontSize: resultFontSize)),
        Expanded(
          child: Row(
            mainAxisAlignment: MainAxisAlignment.end,
            children: [
              _buildIconButton(
                onPressed: value.result == null ? null : controller.previousMatch,
                icon: Icons.arrow_upward,
                tooltip: libL10n.previous,
              ),
              _buildIconButton(
                onPressed: value.result == null ? null : controller.nextMatch,
                icon: Icons.arrow_downward,
                tooltip: libL10n.next,
              ),
              _buildIconButton(
                onPressed: controller.close,
                icon: Icons.close,
                tooltip: libL10n.close,
              )
            ],
          ),
        )
      ],
    );
  }

  Widget _buildReplaceInputView(BuildContext context) {
    final CodeFindValue value = controller.value!;
    return Row(
      children: [
        SizedBox(
          width: _kDefaultFindPanelWidth / 1.75,
          height: _kDefaultFindPanelHeight,
          child: _buildTextField(
            context: context,
            controller: controller.replaceInputController,
            focusNode: controller.replaceInputFocusNode,
          ),
        ),
        _buildIconButton(
          onPressed: value.result == null ? null : controller.replaceMatch,
          icon: Icons.done,
          tooltip: libL10n.replace,
        ),
        _buildIconButton(
          onPressed: value.result == null ? null : controller.replaceAllMatches,
          icon: Icons.done_all,
          tooltip: libL10n.replaceAll,
        )
      ],
    );
  }

  Widget _buildTextField({
    required BuildContext context,
    required TextEditingController controller,
    required FocusNode focusNode,
    double iconsWidth = 0,
  }) {
    return Padding(
      padding: padding,
      child: TextField(
        maxLines: 1,
        focusNode: focusNode,
        style: TextStyle(color: inputTextColor, fontSize: inputFontSize),
        decoration: decoration.copyWith(
            contentPadding:
                (decoration.contentPadding ?? EdgeInsets.zero).add(EdgeInsets.only(right: iconsWidth))),
        controller: controller,
      ),
    );
  }

  Widget _buildCheckText({
    required BuildContext context,
    required String text,
    required bool checked,
    required VoidCallback onPressed,
  }) {
    final Color selectedColor = iconSelectedColor ?? Theme.of(context).primaryColor;
    return GestureDetector(
      onTap: onPressed,
      child: MouseRegion(
        cursor: SystemMouseCursors.click,
        child: SizedBox(
          width: _kDefaultFindIconWidth * 0.75,
          child: Text(
            text,
            style: TextStyle(
              color: checked ? selectedColor : iconColor,
              fontSize: inputFontSize,
            ),
          ),
        ),
      ),
    );
  }

  Widget _buildIconButton({required IconData icon, VoidCallback? onPressed, String? tooltip}) {
    return IconButton(
      onPressed: onPressed,
      icon: Icon(
        icon,
        size: iconSize,
      ),
      constraints: const BoxConstraints(maxWidth: _kDefaultFindIconWidth, maxHeight: _kDefaultFindIconHeight),
      tooltip: tooltip,
      splashRadius: max(_kDefaultFindIconWidth, _kDefaultFindIconHeight) / 2,
    );
  }
}