import 'package:flutter/material.dart';
import '../api/client.dart';
import '../api/models.dart';
import 'run_screen.dart';
import 'pipeline_editor.dart';

class PipelineDetailScreen extends StatefulWidget {
  final Pipeline pipeline;

  const PipelineDetailScreen({super.key, required this.pipeline});

  @override
  State<PipelineDetailScreen> createState() => _PipelineDetailScreenState();
}

class _PipelineDetailScreenState extends State<PipelineDetailScreen> {
  late APIClient _api;
  late Pipeline _pipeline;
  bool _loading = true;

  @override
  void initState() {
    super.initState();
    _pipeline = widget.pipeline;
    _api = APIClient(baseUrl: _parseBaseUrl());
    _load();
  }

  static String _parseBaseUrl() {
    final uri = Uri.base;
    return '${uri.scheme}://${uri.host}${uri.port != 80 && uri.port != 443 ? ':${uri.port}' : ''}';
  }

  Future<void> _load() async {
    try {
      final p = await _api.getPipeline(_pipeline.id);
      setState(() {
        _pipeline = p;
        _loading = false;
      });
    } catch (e) {
      setState(() => _loading = false);
      if (mounted) {
        ScaffoldMessenger.of(
          context,
        ).showSnackBar(SnackBar(content: Text(e.toString())));
      }
    }
  }

  Future<void> _runPipeline() async {
    await Navigator.push<void>(
      context,
      MaterialPageRoute(
        builder: (_) => RunScreen(pipeline: _pipeline, api: _api),
      ),
    );
    _load();
  }

  Future<void> _editPipeline() async {
    final result = await Navigator.push<Pipeline>(
      context,
      MaterialPageRoute(
        builder: (_) => PipelineEditorScreen(pipeline: _pipeline),
      ),
    );
    if (result != null) {
      setState(() => _pipeline = result);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text(_pipeline.name),
        actions: [
          IconButton(
            icon: const Icon(Icons.edit),
            onPressed: _editPipeline,
            tooltip: 'Edit',
          ),
          IconButton(
            icon: const Icon(Icons.refresh),
            onPressed: _load,
            tooltip: 'Refresh',
          ),
        ],
      ),
      body: _loading
          ? const Center(child: CircularProgressIndicator())
          : SingleChildScrollView(
              padding: const EdgeInsets.all(20),
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  SizedBox(
                    width: double.infinity,
                    height: 48,
                    child: FilledButton.icon(
                      onPressed: _runPipeline,
                      icon: const Icon(Icons.play_arrow),
                      label: const Text('Run Pipeline'),
                    ),
                  ),
                  const SizedBox(height: 24),
                  _infoRow('ID', _pipeline.id),
                  _infoRow(
                    'Working Dir',
                    _pipeline.workingDir.isNotEmpty
                        ? _pipeline.workingDir
                        : '(not set)',
                  ),
                  _infoRow('Created', _pipeline.createdAt),
                  _infoRow('Updated', _pipeline.updatedAt),
                  const SizedBox(height: 24),
                  const Text(
                    'Prompts',
                    style: TextStyle(fontSize: 20, fontWeight: FontWeight.bold),
                  ),
                  const SizedBox(height: 12),
                  ..._pipeline.prompts.asMap().entries.map((entry) {
                    final i = entry.key;
                    final p = entry.value;
                    return Card(
                      margin: const EdgeInsets.only(bottom: 12),
                      child: Padding(
                        padding: const EdgeInsets.all(16),
                        child: Column(
                          crossAxisAlignment: CrossAxisAlignment.start,
                          children: [
                            Row(
                              children: [
                                Chip(label: Text('Step ${i + 1}')),
                                const SizedBox(width: 8),
                                Text(
                                  p.title,
                                  style: const TextStyle(
                                    fontWeight: FontWeight.bold,
                                  ),
                                ),
                              ],
                            ),
                            const SizedBox(height: 8),
                            Text(p.text),
                          ],
                        ),
                      ),
                    );
                  }),
                ],
              ),
            ),
    );
  }

  Widget _infoRow(String label, String value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 100,
            child: Text(
              label,
              style: const TextStyle(
                color: Colors.grey,
                fontWeight: FontWeight.bold,
              ),
            ),
          ),
          Expanded(child: Text(value)),
        ],
      ),
    );
  }
}