import os
import uuid
import json
import threading
import subprocess
import time
from datetime import datetime
from flask import Blueprint, request, jsonify, send_file
from werkzeug.utils import secure_filename
import shutil
from src.lora_trainer import create_lora_trainer, validate_training_config

lora_bp = Blueprint('lora', __name__)

# Configurações
UPLOAD_FOLDER = '/tmp/lora_uploads'
TRAINING_FOLDER = '/tmp/lora_training'
RESULTS_FOLDER = '/tmp/lora_results'
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'webp', 'bmp'}

# Armazenamento em memória para status de treinamento
training_status = {}

def allowed_file(filename):
    return '.' in filename and filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

def ensure_directories():
    """Garante que os diretórios necessários existam"""
    for folder in [UPLOAD_FOLDER, TRAINING_FOLDER, RESULTS_FOLDER]:
        os.makedirs(folder, exist_ok=True)

def run_training_process(training_id, config):
    """Executa o processo de treinamento LoRA em thread separada"""
    try:
        # Atualizar status
        training_status[training_id]['status'] = 'preparing'
        training_status[training_id]['progress'] = 10
        training_status[training_id]['message'] = 'Preparando ambiente de treinamento...'
        
        # Criar diretório de treinamento
        training_dir = os.path.join(TRAINING_FOLDER, training_id)
        os.makedirs(training_dir, exist_ok=True)
        
        # Copiar imagens para diretório de treinamento
        images_dir = os.path.join(training_dir, 'images')
        os.makedirs(images_dir, exist_ok=True)
        
        upload_dir = os.path.join(UPLOAD_FOLDER, training_id)
        for filename in os.listdir(upload_dir):
            if allowed_file(filename):
                src = os.path.join(upload_dir, filename)
                dst = os.path.join(images_dir, filename)
                shutil.copy2(src, dst)
        
        training_status[training_id]['progress'] = 20
        training_status[training_id]['message'] = 'Preparando dataset...'
        
        # Configurar paths para treinamento
        output_dir = os.path.join(RESULTS_FOLDER, training_id)
        os.makedirs(output_dir, exist_ok=True)
        
        config['images_dir'] = images_dir
        config['output_dir'] = output_dir
        
        # Validar configuração
        is_valid, validation_message = validate_training_config(config)
        if not is_valid:
            raise Exception(f"Configuração inválida: {validation_message}")
        
        training_status[training_id]['progress'] = 30
        training_status[training_id]['message'] = 'Iniciando treinamento LoRA...'
        
        # Callback para atualizar progresso
        def progress_callback(progress, message):
            training_status[training_id]['progress'] = max(30, min(90, progress))
            training_status[training_id]['message'] = message
            training_status[training_id]['logs'] = training_status[training_id].get('logs', []) + [message]
        
        # Criar e executar trainer
        trainer = create_lora_trainer(config)
        
        # Executar treinamento
        trainer.train(progress_callback=progress_callback)
        
        # Atualizar logs
        training_status[training_id]['logs'] = trainer.training_logs
        
        training_status[training_id]['status'] = 'completed'
        training_status[training_id]['progress'] = 100
        training_status[training_id]['message'] = 'Treinamento concluído com sucesso!'
        training_status[training_id]['completed'] = True
        
        # Criar arquivos adicionais
        create_additional_files(training_id, config, output_dir)
        
        # Criar links de download
        download_links = []
        for filename in os.listdir(output_dir):
            if os.path.isfile(os.path.join(output_dir, filename)):
                download_links.append({
                    'name': filename,
                    'url': f'/api/download/{training_id}/{filename}'
                })
        
        training_status[training_id]['download_links'] = download_links
        training_status[training_id]['trigger_word'] = config['trigger_word']
        
    except Exception as e:
        training_status[training_id]['status'] = 'error'
        training_status[training_id]['error'] = str(e)
        training_status[training_id]['message'] = f'Erro durante treinamento: {str(e)}'

def create_additional_files(training_id, config, output_dir):
    """Cria arquivos adicionais de resultado"""
    
    # Criar README com instruções detalhadas
    readme_content = f'''# LoRA: {config['character_name']}

## Informações do Treinamento
- **Personagem**: {config['character_name']}
- **Trigger Word**: {config['trigger_word']}
- **Resolução**: {config['resolution']}x{config['resolution']}
- **Rank**: {config['rank']}
- **Learning Rate**: {config['learning_rate']}
- **Épocas**: {config['epochs']}
- **Data de Treinamento**: {datetime.now().strftime('%Y-%m-%d %H:%M:%S')}

## Como Usar

### ComfyUI
1. Coloque o arquivo `pytorch_lora_weights.safetensors` na pasta `models/loras/` do ComfyUI
2. No workflow, adicione um nó "Load LoRA"
3. Selecione o arquivo LoRA
4. Use a trigger word "{config['trigger_word']}" em seus prompts
5. Ajuste o peso entre 0.7 e 1.0

### Automatic1111
1. Coloque o arquivo `pytorch_lora_weights.safetensors` na pasta `models/Lora/`
2. Use a sintaxe `<lora:pytorch_lora_weights:0.8>` no prompt
3. Inclua a trigger word "{config['trigger_word']}" no prompt

### SeaArt
1. Faça upload do arquivo LoRA na plataforma
2. Selecione o LoRA em suas gerações
3. Use a trigger word "{config['trigger_word']}" no prompt

## Exemplos de Prompts
- "{config['trigger_word']}, portrait, high quality"
- "{config['trigger_word']}, full body, standing, detailed"
- "{config['trigger_word']}, close-up, beautiful lighting"
- "{config['trigger_word']}, anime style, colorful"
- "{config['trigger_word']}, realistic, photographic"

## Dicas de Uso
- Use peso entre 0.7-1.0 para melhores resultados
- Combine com outros LoRAs para estilos específicos
- Experimente diferentes CFG scales (7-12)
- Para resultados mais consistentes, use a trigger word no início do prompt
- Ajuste o peso do LoRA conforme necessário para cada geração

## Compatibilidade
Este LoRA é compatível com:
- Stable Diffusion 1.5
- ComfyUI
- Automatic1111 WebUI
- SeaArt
- Fooocus
- InvokeAI
- E outras ferramentas que suportam LoRA

## Suporte
Para dúvidas ou problemas, consulte a documentação da ferramenta utilizada.
'''
    
    readme_file = os.path.join(output_dir, 'README.md')
    with open(readme_file, 'w', encoding='utf-8') as f:
        f.write(readme_content)
    
    # Criar arquivo de metadados
    metadata = {
        "model_name": config['character_name'],
        "trigger_word": config['trigger_word'],
        "base_model": "runwayml/stable-diffusion-v1-5",
        "training_config": config,
        "created_at": datetime.now().isoformat(),
        "version": "1.0",
        "type": "character_lora",
        "tags": ["character", "lora", "consistent", config['character_name']],
        "description": f"LoRA treinado para o personagem {config['character_name']} usando a trigger word '{config['trigger_word']}'",
        "usage_instructions": {
            "trigger_word": config['trigger_word'],
            "recommended_weight": "0.7-1.0",
            "compatible_models": ["SD1.5"],
            "example_prompts": [
                f"{config['trigger_word']}, portrait, high quality",
                f"{config['trigger_word']}, full body, detailed",
                f"{config['trigger_word']}, close-up, beautiful lighting"
            ]
        }
    }
    
    metadata_file = os.path.join(output_dir, 'metadata.json')
    with open(metadata_file, 'w', encoding='utf-8') as f:
        json.dump(metadata, f, indent=2, ensure_ascii=False)

@lora_bp.route('/train', methods=['POST'])
def start_training():
    """Inicia o treinamento LoRA"""
    try:
        ensure_directories()
        
        # Gerar ID único para o treinamento
        training_id = str(uuid.uuid4())
        
        # Verificar se há imagens
        if 'images' not in request.files:
            return jsonify({'success': False, 'message': 'Nenhuma imagem foi enviada'}), 400
        
        files = request.files.getlist('images')
        if len(files) < 5:
            return jsonify({'success': False, 'message': 'Mínimo de 5 imagens necessárias'}), 400
        
        # Criar diretório para upload
        upload_dir = os.path.join(UPLOAD_FOLDER, training_id)
        os.makedirs(upload_dir, exist_ok=True)
        
        # Salvar imagens
        saved_files = []
        for file in files:
            if file and allowed_file(file.filename):
                filename = secure_filename(file.filename)
                filepath = os.path.join(upload_dir, filename)
                file.save(filepath)
                saved_files.append(filename)
        
        if len(saved_files) < 5:
            return jsonify({'success': False, 'message': 'Pelo menos 5 imagens válidas são necessárias'}), 400
        
        # Obter configurações
        config = {
            'character_name': request.form.get('character_name', '').strip(),
            'trigger_word': request.form.get('trigger_word', '').strip(),
            'resolution': request.form.get('resolution', '512'),
            'learning_rate': request.form.get('learning_rate', '1e-4'),
            'rank': request.form.get('rank', '16'),
            'epochs': request.form.get('epochs', '20'),
            'description': request.form.get('description', '').strip(),
            'images': saved_files,
            'training_id': training_id,
            'created_at': datetime.now().isoformat()
        }
        
        # Validar configurações obrigatórias
        if not config['character_name']:
            return jsonify({'success': False, 'message': 'Nome do personagem é obrigatório'}), 400
        
        if not config['trigger_word']:
            return jsonify({'success': False, 'message': 'Trigger word é obrigatória'}), 400
        
        # Inicializar status do treinamento
        training_status[training_id] = {
            'status': 'starting',
            'progress': 0,
            'message': 'Iniciando treinamento...',
            'logs': [],
            'completed': False,
            'error': None,
            'config': config
        }
        
        # Iniciar treinamento em thread separada
        training_thread = threading.Thread(
            target=run_training_process,
            args=(training_id, config)
        )
        training_thread.daemon = True
        training_thread.start()
        
        return jsonify({
            'success': True,
            'training_id': training_id,
            'message': 'Treinamento iniciado com sucesso'
        })
        
    except Exception as e:
        return jsonify({'success': False, 'message': f'Erro interno: {str(e)}'}), 500

@lora_bp.route('/training-status/<training_id>', methods=['GET'])
def get_training_status(training_id):
    """Retorna o status do treinamento"""
    if training_id not in training_status:
        return jsonify({'error': 'Treinamento não encontrado'}), 404
    
    return jsonify(training_status[training_id])

@lora_bp.route('/download/<training_id>/<filename>', methods=['GET'])
def download_file(training_id, filename):
    """Download de arquivos de resultado"""
    try:
        result_dir = os.path.join(RESULTS_FOLDER, training_id)
        file_path = os.path.join(result_dir, filename)
        
        if not os.path.exists(file_path):
            return jsonify({'error': 'Arquivo não encontrado'}), 404
        
        return send_file(file_path, as_attachment=True, download_name=filename)
        
    except Exception as e:
        return jsonify({'error': f'Erro ao baixar arquivo: {str(e)}'}), 500

@lora_bp.route('/trainings', methods=['GET'])
def list_trainings():
    """Lista todos os treinamentos"""
    trainings = []
    for training_id, status in training_status.items():
        trainings.append({
            'id': training_id,
            'character_name': status.get('config', {}).get('character_name', 'Desconhecido'),
            'status': status.get('status', 'unknown'),
            'progress': status.get('progress', 0),
            'created_at': status.get('config', {}).get('created_at', '')
        })
    
    return jsonify({'trainings': trainings})

@lora_bp.route('/delete-training/<training_id>', methods=['DELETE'])
def delete_training(training_id):
    """Remove um treinamento e seus arquivos"""
    try:
        # Remover do status
        if training_id in training_status:
            del training_status[training_id]
        
        # Remover diretórios
        for base_dir in [UPLOAD_FOLDER, TRAINING_FOLDER, RESULTS_FOLDER]:
            training_dir = os.path.join(base_dir, training_id)
            if os.path.exists(training_dir):
                shutil.rmtree(training_dir)
        
        return jsonify({'success': True, 'message': 'Treinamento removido com sucesso'})
        
    except Exception as e:
        return jsonify({'success': False, 'message': f'Erro ao remover treinamento: {str(e)}'}), 500