"""
Flask API routes for CBCFacil dashboard
"""
import os
from datetime import datetime
from pathlib import Path
from typing import Dict, Any, List
from flask import Flask, render_template, request, jsonify, send_from_directory
from flask_cors import CORS

from config import settings
from storage import processed_registry
from services.webdav_service import webdav_service
from services import vram_manager


def create_app() -> Flask:
    """Create and configure Flask application"""
    app = Flask(__name__)
    CORS(app)

    # Configure app
    app.config['SECRET_KEY'] = settings.DASHBOARD_SECRET_KEY or os.urandom(24)
    app.config['DOWNLOADS_FOLDER'] = str(settings.LOCAL_DOWNLOADS_PATH)

    @app.route('/')
    def index():
        """Dashboard home page"""
        return render_template('index.html')

    @app.route('/api/files')
    def get_files():
        """Get list of audio files"""
        try:
            files = get_audio_files()
            return jsonify({
                'success': True,
                'files': files,
                'total': len(files),
                'processed': sum(1 for f in files if f['processed']),
                'pending': sum(1 for f in files if not f['processed'])
            })
        except Exception as e:
            app.logger.error(f"Error getting files: {e}")
            return jsonify({
                'success': False,
                'message': f"Error: {str(e)}"
            }), 500

    @app.route('/api/reprocess', methods=['POST'])
    def reprocess_file():
        """Reprocess a file"""
        try:
            data = request.get_json()
            file_path = data.get('path')
            source = data.get('source', 'local')

            if not file_path:
                return jsonify({
                    'success': False,
                    'message': "Path del archivo es requerido"
                }), 400

            # TODO: Implement file reprocessing
            # This would trigger the main processing loop

            return jsonify({
                'success': True,
                'message': f"Archivo {Path(file_path).name} enviado a reprocesamiento"
            })

        except Exception as e:
            app.logger.error(f"Error reprocessing file: {e}")
            return jsonify({
                'success': False,
                'message': f"Error: {str(e)}"
            }), 500

    @app.route('/api/mark-unprocessed', methods=['POST'])
    def mark_unprocessed():
        """Mark file as unprocessed"""
        try:
            data = request.get_json()
            file_path = data.get('path')

            if not file_path:
                return jsonify({
                    'success': False,
                    'message': "Path del archivo es requerido"
                }), 400

            success = processed_registry.remove(file_path)

            if success:
                return jsonify({
                    'success': True,
                    'message': "Archivo marcado como no procesado"
                })
            else:
                return jsonify({
                    'success': False,
                    'message': "No se pudo marcar como no procesado"
                }), 500

        except Exception as e:
            app.logger.error(f"Error marking unprocessed: {e}")
            return jsonify({
                'success': False,
                'message': f"Error: {str(e)}"
            }), 500

    @app.route('/api/refresh')
    def refresh_files():
        """Refresh file list"""
        try:
            processed_registry.load()
            files = get_audio_files()
            return jsonify({
                'success': True,
                'message': "Lista de archivos actualizada",
                'files': files
            })
        except Exception as e:
            app.logger.error(f"Error refreshing files: {e}")
            return jsonify({
                'success': False,
                'message': f"Error: {str(e)}"
            }), 500

    @app.route('/downloads/<path:filename>')
    def download_file(filename):
        """Download file"""
        try:
            # Validate path to prevent traversal and injection attacks
            normalized = Path(filename).resolve()
            base_downloads = Path(str(settings.LOCAL_DOWNLOADS_PATH)).resolve()
            base_docx = Path(str(settings.LOCAL_DOCX)).resolve()
            if '..' in filename or filename.startswith('/') or \
               normalized.parts[0] in ['..', '...'] if len(normalized.parts) > 0 else False or \
               not (normalized == base_downloads or normalized.is_relative_to(base_downloads) or
                    normalized == base_docx or normalized.is_relative_to(base_docx)):
                return jsonify({'error': 'Invalid filename'}), 400

            # Try downloads directory
            downloads_path = settings.LOCAL_DOWNLOADS_PATH / filename
            if downloads_path.exists():
                return send_from_directory(str(settings.LOCAL_DOWNLOADS_PATH), filename)

            # Try resumenes_docx directory
            docx_path = settings.LOCAL_DOCX / filename
            if docx_path.exists():
                return send_from_directory(str(settings.LOCAL_DOCX), filename)

            return jsonify({'error': 'File not found'}), 404

        except Exception as e:
            app.logger.error(f"Error downloading file: {e}")
            return jsonify({'error': 'File not found'}), 404

    @app.route('/health')
    def health_check():
        """Health check endpoint"""
        gpu_info = vram_manager.get_usage()

        return jsonify({
            'status': 'healthy',
            'timestamp': datetime.now().isoformat(),
            'processed_files_count': processed_registry.count(),
            'gpu': gpu_info,
            'config': {
                'webdav_configured': settings.has_webdav_config,
                'ai_configured': settings.has_ai_config,
                'debug': settings.DEBUG
            }
        })

    return app


def get_audio_files() -> List[Dict[str, Any]]:
    """Get list of audio files from WebDAV and local"""
    files = []

    # Get files from WebDAV
    if settings.has_webdav_config:
        try:
            webdav_files = webdav_service.list(settings.REMOTE_AUDIOS_FOLDER)
            for file_path in webdav_files:
                normalized_path = webdav_service.normalize_path(file_path)
                base_name = Path(normalized_path).name

                if any(normalized_path.lower().endswith(ext) for ext in settings.AUDIO_EXTENSIONS):
                    is_processed = processed_registry.is_processed(normalized_path)

                    files.append({
                        'filename': base_name,
                        'path': normalized_path,
                        'source': 'webdav',
                        'processed': is_processed,
                        'size': 'Unknown',
                        'last_modified': 'Unknown',
                        'available_formats': get_available_formats(base_name)
                    })
        except Exception as e:
            app.logger.error(f"Error getting WebDAV files: {e}")

    # Get local files
    try:
        if settings.LOCAL_DOWNLOADS_PATH.exists():
            for ext in settings.AUDIO_EXTENSIONS:
                for file_path in settings.LOCAL_DOWNLOADS_PATH.glob(f"*{ext}"):
                    stat = file_path.stat()
                    is_processed = processed_registry.is_processed(file_path.name)

                    files.append({
                        'filename': file_path.name,
                        'path': str(file_path),
                        'source': 'local',
                        'processed': is_processed,
                        'size': format_size(stat.st_size),
                        'last_modified': datetime.fromtimestamp(stat.st_mtime).strftime('%Y-%m-%d %H:%M:%S'),
                        'available_formats': get_available_formats(file_path.name)
                    })
    except Exception as e:
        app.logger.error(f"Error getting local files: {e}")

    # Remove duplicates (WebDAV takes precedence)
    unique_files = {}
    for file in files:
        key = file['filename']
        if key not in unique_files or file['source'] == 'webdav':
            unique_files[key] = file

    return sorted(unique_files.values(), key=lambda x: x['filename'])


def get_available_formats(audio_filename: str) -> Dict[str, bool]:
    """Check which output formats are available for an audio file"""
    base_name = Path(audio_filename).stem

    formats = {
        'txt': False,
        'md': False,
        'pdf': False,
        'docx': False
    }

    directories_to_check = [
        settings.LOCAL_DOWNLOADS_PATH,
        settings.LOCAL_DOCX
    ]

    for directory in directories_to_check:
        if not directory.exists():
            continue

        for ext in formats.keys():
            name_variants = [
                base_name,
                f"{base_name}_unificado",
                base_name.replace(' ', '_'),
                f"{base_name.replace(' ', '_')}_unificado",
            ]

            for name_variant in name_variants:
                file_path = directory / f"{name_variant}.{ext}"
                if file_path.exists():
                    formats[ext] = True
                    break

    return formats


def format_size(size_bytes: int) -> str:
    """Format size in human-readable format"""
    for unit in ['B', 'KB', 'MB', 'GB']:
        if size_bytes < 1024.0:
            return f"{size_bytes:.1f} {unit}"
        size_bytes /= 1024.0
    return f"{size_bytes:.1f} TB"