import 'package:flutter/material.dart';
import 'package:flutter_code_editor/flutter_code_editor.dart';

import 'code_editor_language.dart';

export 'code_editor_language.dart';

/// A generic code editor widget with syntax highlighting.
///
/// Supports multiple languages via [CodeEditorLanguage] configuration.
class CodeEditor extends StatefulWidget {
  const CodeEditor({
    super.key,
    required this.language,
    this.initialValue = '',
    this.onChanged,
    this.readOnly = false,
    this.showLineNumbers = true,
  });

  /// The programming language for syntax highlighting.
  final CodeEditorLanguage language;

  /// Initial content of the editor.
  final String initialValue;

  /// Called when the content changes.
  final ValueChanged<String>? onChanged;

  /// Whether the editor is read-only.
  final bool readOnly;

  /// Whether to show line numbers.
  final bool showLineNumbers;

  @override
  State<CodeEditor> createState() => CodeEditorState();
}

class CodeEditorState extends State<CodeEditor> {
  late CodeController _controller;

  @override
  void initState() {
    super.initState();
    _initController();
  }

  void _initController() {
    _controller = CodeController(
      text: widget.initialValue,
      language: widget.language.mode,
    );

    _controller.addListener(_onTextChanged);
  }

  void _onTextChanged() {
    widget.onChanged?.call(_controller.text);
  }

  @override
  void didUpdateWidget(CodeEditor oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.language != widget.language) {
      // Language changed, recreate controller
      _controller.removeListener(_onTextChanged);
      final currentText = _controller.text;
      _controller.dispose();
      _controller = CodeController(
        text: currentText,
        language: widget.language.mode,
      );
      _controller.addListener(_onTextChanged);
    }
  }

  @override
  void dispose() {
    _controller.removeListener(_onTextChanged);
    _controller.dispose();
    super.dispose();
  }

  /// Gets the current text content.
  String get text => _controller.text;

  /// Sets the text content programmatically.
  set text(String value) {
    _controller.text = value;
  }

  @override
  Widget build(BuildContext context) {
    final colorScheme = Theme.of(context).colorScheme;
    final isDark = Theme.of(context).brightness == Brightness.dark;

    return CodeTheme(
      data: isDark ? _darkTheme(colorScheme) : _lightTheme(colorScheme),
      child: SingleChildScrollView(
        child: CodeField(
          controller: _controller,
          readOnly: widget.readOnly,
          minLines: 1,
          gutterStyle: widget.showLineNumbers
              ? GutterStyle(
                  showLineNumbers: true,
                  showErrors: false,
                  showFoldingHandles: false,
                  margin: 0,
                  textStyle: TextStyle(
                    fontFamily: 'monospace',
                    fontSize: 12,
                    color: colorScheme.outline,
                  ),
                  background: colorScheme.surfaceContainerLow,
                )
              : GutterStyle.none,
          textStyle: TextStyle(
            fontFamily: 'monospace',
            fontSize: 13,
            height: 1.5,
            color: colorScheme.onSurface,
          ),
          padding: const EdgeInsets.all(16),
          background: colorScheme.surfaceContainerLowest,
        ),
      ),
    );
  }

  CodeThemeData _lightTheme(ColorScheme colorScheme) {
    return CodeThemeData(
      styles: {
        'root': TextStyle(
          color: colorScheme.onSurface,
          backgroundColor: colorScheme.surfaceContainerLowest,
        ),
        'keyword': TextStyle(color: Colors.purple.shade700),
        'string': TextStyle(color: Colors.green.shade700),
        'number': TextStyle(color: Colors.blue.shade700),
        'comment': TextStyle(
          color: Colors.grey.shade600,
          fontStyle: FontStyle.italic,
        ),
        'attr': TextStyle(color: Colors.orange.shade800),
        'literal': TextStyle(color: Colors.teal.shade700),
        'built_in': TextStyle(color: Colors.indigo.shade600),
        'type': TextStyle(color: Colors.cyan.shade800),
        'variable': TextStyle(color: Colors.brown.shade600),
        'symbol': TextStyle(color: Colors.red.shade700),
        'section': TextStyle(color: Colors.deepPurple.shade700),
        'meta': TextStyle(color: Colors.pink.shade700),
      },
    );
  }

  CodeThemeData _darkTheme(ColorScheme colorScheme) {
    return CodeThemeData(
      styles: {
        'root': TextStyle(
          color: colorScheme.onSurface,
          backgroundColor: colorScheme.surfaceContainerLowest,
        ),
        'keyword': const TextStyle(color: Color(0xFFC792EA)),
        'string': const TextStyle(color: Color(0xFFC3E88D)),
        'number': const TextStyle(color: Color(0xFFF78C6C)),
        'comment': TextStyle(
          color: Colors.grey.shade500,
          fontStyle: FontStyle.italic,
        ),
        'attr': const TextStyle(color: Color(0xFFFFCB6B)),
        'literal': const TextStyle(color: Color(0xFF82AAFF)),
        'built_in': const TextStyle(color: Color(0xFF89DDFF)),
        'type': const TextStyle(color: Color(0xFFFFCB6B)),
        'variable': const TextStyle(color: Color(0xFFEEFFFF)),
        'symbol': const TextStyle(color: Color(0xFFF07178)),
        'section': const TextStyle(color: Color(0xFF82AAFF)),
        'meta': const TextStyle(color: Color(0xFFF78C6C)),
      },
    );
  }
}