"""
API REST Complète - Expose toutes les fonctionnalités du core RPA Vision V3

Endpoints:
- /api/core/capture - Capture d'écran
- /api/core/detect - Détection UI
- /api/core/embed - Génération d'embeddings
- /api/core/match - Matching d'écran
- /api/core/faiss - Gestion index FAISS
- /api/core/pipeline - Pipeline complet
"""

import os
import sys
import json
import base64
import tempfile
from pathlib import Path
from datetime import datetime
from flask import Blueprint, jsonify, request, send_file
from io import BytesIO

# Add parent to path
sys.path.insert(0, str(Path(__file__).parent.parent))

api_core = Blueprint('api_core', __name__, url_prefix='/api/core')

# Lazy-loaded components
_pipeline = None
_capturer = None
_detector = None


def get_pipeline():
    global _pipeline
    if _pipeline is None:
        from core.pipeline.workflow_pipeline import WorkflowPipeline
        _pipeline = WorkflowPipeline()
    return _pipeline


def get_capturer():
    global _capturer
    if _capturer is None:
        from core.capture.screen_capturer import ScreenCapturer
        _capturer = ScreenCapturer()
    return _capturer


# =============================================================================
# Capture API
# =============================================================================

@api_core.route('/capture', methods=['GET'])
def capture_screen():
    """Capture l'écran actuel et retourne l'image."""
    try:
        capturer = get_capturer()
        frame = capturer.capture_frame()
        
        if frame is None:
            return jsonify({'error': 'Capture failed'}), 500
        
        # Convert to base64
        from PIL import Image
        img = Image.fromarray(frame.image)
        buffer = BytesIO()
        img.save(buffer, format='PNG')
        img_base64 = base64.b64encode(buffer.getvalue()).decode()
        
        return jsonify({
            'success': True,
            'frame_id': frame.frame_id,
            'timestamp': frame.timestamp.isoformat(),
            'resolution': [frame.image.shape[1], frame.image.shape[0]],
            'hash': frame.hash,
            'changed': frame.changed_from_previous,
            'window_info': frame.window_info,
            'image_base64': img_base64
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/capture/stats', methods=['GET'])
def capture_stats():
    """Statistiques de capture."""
    try:
        capturer = get_capturer()
        stats = capturer.get_stats()
        return jsonify({
            'total_captures': stats.total_captures,
            'captures_per_second': stats.captures_per_second,
            'unchanged_skipped': stats.unchanged_frames_skipped,
            'avg_capture_time_ms': stats.average_capture_time_ms,
            'buffer_size': stats.buffer_size,
            'memory_mb': stats.memory_usage_mb
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/capture/window', methods=['GET'])
def get_active_window():
    """Info sur la fenêtre active."""
    try:
        capturer = get_capturer()
        window = capturer.get_active_window()
        return jsonify({'window': window})
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# Detection API
# =============================================================================

@api_core.route('/detect', methods=['POST'])
def detect_ui():
    """Détecte les éléments UI dans une image."""
    try:
        data = request.get_json()
        
        # Accept base64 image or file path
        if 'image_base64' in data:
            import base64
            from PIL import Image
            img_data = base64.b64decode(data['image_base64'])
            img = Image.open(BytesIO(img_data))
            
            # Save to temp file
            with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as f:
                img.save(f.name)
                image_path = f.name
        elif 'image_path' in data:
            image_path = data['image_path']
        else:
            return jsonify({'error': 'image_base64 or image_path required'}), 400
        
        pipeline = get_pipeline()
        
        if pipeline.ui_detector is None:
            return jsonify({'error': 'UI detector not available'}), 503
        
        elements = pipeline.ui_detector.detect(image_path)
        
        return jsonify({
            'success': True,
            'elements_count': len(elements),
            'elements': [
                {
                    'element_id': el.element_id,
                    'type': el.type,
                    'role': el.role,
                    'label': el.label,
                    'bbox': list(el.bbox),
                    'confidence': el.confidence
                }
                for el in elements
            ]
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# Embedding API
# =============================================================================

@api_core.route('/embed/image', methods=['POST'])
def embed_image():
    """Génère un embedding pour une image."""
    try:
        data = request.get_json()
        
        if 'image_base64' not in data:
            return jsonify({'error': 'image_base64 required'}), 400
        
        import base64
        from PIL import Image
        import numpy as np
        
        img_data = base64.b64decode(data['image_base64'])
        img = Image.open(BytesIO(img_data))
        
        pipeline = get_pipeline()
        embedding = pipeline.clip_embedder.embed_image(img)
        
        return jsonify({
            'success': True,
            'dimensions': len(embedding),
            'embedding': embedding.tolist()
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/embed/text', methods=['POST'])
def embed_text():
    """Génère un embedding pour du texte."""
    try:
        data = request.get_json()
        text = data.get('text')
        
        if not text:
            return jsonify({'error': 'text required'}), 400
        
        pipeline = get_pipeline()
        embedding = pipeline.clip_embedder.embed_text(text)
        
        return jsonify({
            'success': True,
            'dimensions': len(embedding),
            'embedding': embedding.tolist()
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/embed/similarity', methods=['POST'])
def compute_similarity():
    """Calcule la similarité entre deux embeddings."""
    try:
        data = request.get_json()
        emb1 = data.get('embedding1')
        emb2 = data.get('embedding2')
        
        if not emb1 or not emb2:
            return jsonify({'error': 'embedding1 and embedding2 required'}), 400
        
        import numpy as np
        v1 = np.array(emb1)
        v2 = np.array(emb2)
        
        # Cosine similarity
        similarity = float(np.dot(v1, v2) / (np.linalg.norm(v1) * np.linalg.norm(v2)))
        
        return jsonify({
            'success': True,
            'similarity': similarity
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# FAISS API
# =============================================================================

@api_core.route('/faiss/stats', methods=['GET'])
def faiss_stats():
    """Statistiques de l'index FAISS."""
    try:
        pipeline = get_pipeline()
        stats = pipeline.faiss_manager.get_stats()
        return jsonify(stats)
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/faiss/add', methods=['POST'])
def faiss_add():
    """Ajoute un embedding à l'index FAISS."""
    try:
        data = request.get_json()
        embedding_id = data.get('embedding_id')
        embedding = data.get('embedding')
        metadata = data.get('metadata', {})
        
        if not embedding_id or not embedding:
            return jsonify({'error': 'embedding_id and embedding required'}), 400
        
        import numpy as np
        vector = np.array(embedding, dtype=np.float32)
        
        pipeline = get_pipeline()
        pipeline.faiss_manager.add_embedding(embedding_id, vector, metadata)
        
        return jsonify({
            'success': True,
            'embedding_id': embedding_id,
            'total_embeddings': pipeline.faiss_manager.get_stats().get('total_embeddings', 0)
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/faiss/search', methods=['POST'])
def faiss_search():
    """Recherche les embeddings similaires."""
    try:
        data = request.get_json()
        query = data.get('query')
        k = data.get('k', 5)
        
        if not query:
            return jsonify({'error': 'query embedding required'}), 400
        
        import numpy as np
        query_vector = np.array(query, dtype=np.float32)
        
        pipeline = get_pipeline()
        results = pipeline.faiss_manager.search(query_vector, k=k)
        
        return jsonify({
            'success': True,
            'results': results
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# Pipeline API
# =============================================================================

@api_core.route('/pipeline/match', methods=['POST'])
def pipeline_match():
    """Match l'écran actuel avec les workflows connus."""
    try:
        data = request.get_json() or {}
        workflow_id = data.get('workflow_id')
        
        # Capture current screen
        capturer = get_capturer()
        frame = capturer.capture_frame()
        
        if frame is None:
            return jsonify({'error': 'Capture failed'}), 500
        
        # Save to temp file
        from PIL import Image
        with tempfile.NamedTemporaryFile(suffix='.png', delete=False) as f:
            img = Image.fromarray(frame.image)
            img.save(f.name)
            screenshot_path = f.name
        
        pipeline = get_pipeline()
        match = pipeline.match_current_state(
            screenshot_path,
            workflow_id=workflow_id,
            window_title=frame.window_info.get('title') if frame.window_info else None
        )
        
        return jsonify({
            'success': True,
            'match': match,
            'window_info': frame.window_info
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/pipeline/process', methods=['POST'])
def pipeline_process():
    """Traite une session complète."""
    try:
        data = request.get_json()
        session_id = data.get('session_id')
        
        if not session_id:
            return jsonify({'error': 'session_id required'}), 400
        
        # This would trigger async processing
        return jsonify({
            'success': True,
            'message': f'Processing started for {session_id}',
            'status': 'queued'
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# Workflow Export/Import API
# =============================================================================

@api_core.route('/workflows/export/<workflow_id>', methods=['GET'])
def export_workflow(workflow_id):
    """Exporte un workflow en JSON."""
    try:
        pipeline = get_pipeline()
        workflow = pipeline.load_workflow(workflow_id)
        
        if not workflow:
            return jsonify({'error': 'Workflow not found'}), 404
        
        # Return as downloadable JSON
        workflow_json = workflow.to_json()
        
        return jsonify({
            'success': True,
            'workflow_id': workflow_id,
            'workflow': json.loads(workflow_json)
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/workflows/export/<workflow_id>/download', methods=['GET'])
def download_workflow(workflow_id):
    """Télécharge un workflow en fichier JSON."""
    try:
        pipeline = get_pipeline()
        workflow = pipeline.load_workflow(workflow_id)
        
        if not workflow:
            return jsonify({'error': 'Workflow not found'}), 404
        
        workflow_json = workflow.to_json()
        
        buffer = BytesIO(workflow_json.encode('utf-8'))
        buffer.seek(0)
        
        return send_file(
            buffer,
            mimetype='application/json',
            as_attachment=True,
            download_name=f'{workflow_id}.json'
        )
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/workflows/import', methods=['POST'])
def import_workflow():
    """Importe un workflow depuis JSON."""
    try:
        data = request.get_json()
        workflow_data = data.get('workflow')
        overwrite = data.get('overwrite', False)
        
        if not workflow_data:
            return jsonify({'error': 'workflow data required'}), 400
        
        from core.models.workflow_graph import Workflow
        
        workflow = Workflow.from_dict(workflow_data)
        workflow_id = workflow.workflow_id
        
        # Check if exists
        workflows_dir = Path('data/training/workflows')
        workflows_dir.mkdir(parents=True, exist_ok=True)
        workflow_path = workflows_dir / f'{workflow_id}.json'
        
        if workflow_path.exists() and not overwrite:
            return jsonify({
                'error': f'Workflow {workflow_id} already exists. Set overwrite=true to replace.'
            }), 409
        
        # Save
        workflow.save_to_file(workflow_path)
        
        return jsonify({
            'success': True,
            'workflow_id': workflow_id,
            'message': 'Workflow imported successfully'
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


@api_core.route('/workflows/clone/<workflow_id>', methods=['POST'])
def clone_workflow(workflow_id):
    """Clone un workflow avec un nouveau nom."""
    try:
        data = request.get_json() or {}
        new_id = data.get('new_id', f'{workflow_id}_copy')
        new_name = data.get('new_name')
        
        pipeline = get_pipeline()
        workflow = pipeline.load_workflow(workflow_id)
        
        if not workflow:
            return jsonify({'error': 'Workflow not found'}), 404
        
        # Clone
        workflow_dict = workflow.to_dict()
        workflow_dict['workflow_id'] = new_id
        if new_name:
            workflow_dict['name'] = new_name
        workflow_dict['created_at'] = datetime.now().isoformat()
        workflow_dict['updated_at'] = datetime.now().isoformat()
        
        from core.models.workflow_graph import Workflow
        new_workflow = Workflow.from_dict(workflow_dict)
        
        # Save
        workflows_dir = Path('data/training/workflows')
        new_workflow.save_to_file(workflows_dir / f'{new_id}.json')
        
        return jsonify({
            'success': True,
            'original_id': workflow_id,
            'new_id': new_id
        })
    except Exception as e:
        return jsonify({'error': str(e)}), 500


# =============================================================================
# Health & Info
# =============================================================================

@api_core.route('/health', methods=['GET'])
def health():
    """Health check."""
    return jsonify({
        'status': 'healthy',
        'timestamp': datetime.now().isoformat()
    })


@api_core.route('/info', methods=['GET'])
def info():
    """Informations sur l'API."""
    return jsonify({
        'name': 'RPA Vision V3 Core API',
        'version': '1.0.0',
        'endpoints': [
            '/api/core/capture',
            '/api/core/capture/stats',
            '/api/core/capture/window',
            '/api/core/detect',
            '/api/core/embed/image',
            '/api/core/embed/text',
            '/api/core/embed/similarity',
            '/api/core/faiss/stats',
            '/api/core/faiss/add',
            '/api/core/faiss/search',
            '/api/core/pipeline/match',
            '/api/core/pipeline/process',
            '/api/core/workflows/export/<id>',
            '/api/core/workflows/export/<id>/download',
            '/api/core/workflows/import',
            '/api/core/workflows/clone/<id>',
            '/api/core/health',
            '/api/core/info'
        ]
    })