"""
模型管理 API 路由
"""
import os
import pymysql
import yaml
from flask import Blueprint, request, jsonify

# 获取项目根目录 - 优先使用环境变量，否则从文件路径计算
MOUNT_BASE = os.environ.get('MOUNT_BASE', '/app/base')
PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
# 如果 PROJECT_ROOT 是 /app 或 /app/src/llamafactory，则使用挂载路径
if PROJECT_ROOT in ('/app', '/app/src/llamafactory'):
    PROJECT_ROOT = MOUNT_BASE

# 创建蓝图
model_manage_bp = Blueprint('model_manage', __name__, url_prefix='/api/model-manage')


def get_db_connection():
    """获取数据库连接"""
    CONFIG_PATH = os.path.join(PROJECT_ROOT, 'config.yaml')
    with open(CONFIG_PATH, 'r', encoding='utf-8') as f:
        CONFIG = yaml.safe_load(f)
    db_config = CONFIG['database']
    return pymysql.connect(
        host=db_config['host'],
        port=db_config['port'],
        user=db_config['username'],
        password=db_config['password'],
        database=db_config['name'],
        charset=db_config.get('charset', 'utf8mb4'),
        cursorclass=pymysql.cursors.DictCursor
    )


def generic_get_all(table_name, order_by='create_time DESC'):
    """通用查询所有"""
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute(f"SELECT * FROM {table_name} ORDER BY {order_by}")
    result = cursor.fetchall()
    cursor.close()
    conn.close()
    return result


def generic_create(table_name, data):
    """通用创建"""
    conn = get_db_connection()
    cursor = conn.cursor()
    columns = ', '.join(data.keys())
    placeholders = ', '.join(['%s'] * len(data))
    sql = f"INSERT INTO {table_name} ({columns}) VALUES ({placeholders})"
    cursor.execute(sql, list(data.values()))
    conn.commit()
    new_id = cursor.lastrowid
    cursor.close()
    conn.close()
    return new_id


def generic_update(table_name, id_val, data):
    """通用更新"""
    conn = get_db_connection()
    cursor = conn.cursor()
    set_clause = ', '.join([f"{k} = %s" for k in data.keys()])
    sql = f"UPDATE {table_name} SET {set_clause} WHERE id = %s"
    values = list(data.values()) + [id_val]
    cursor.execute(sql, values)
    conn.commit()
    cursor.close()
    conn.close()


def generic_delete(table_name, id_val):
    """通用删除"""
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute(f"DELETE FROM {table_name} WHERE id = %s", (id_val,))
    conn.commit()
    cursor.close()
    conn.close()


def generic_get_by_id(table_name, id_val):
    """通用按ID查询"""
    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute(f"SELECT * FROM {table_name} WHERE id = %s", (id_val,))
    result = cursor.fetchone()
    cursor.close()
    conn.close()
    return result


# ============ 模型管理 CRUD ============

@model_manage_bp.route('', methods=['GET'])
def get_model_manage():
    """获取所有模型"""
    return jsonify({'code': 0, 'data': generic_get_all('model_manage')})


@model_manage_bp.route('/<int:id>', methods=['GET'])
def get_model_manage_by_id(id):
    """获取单个模型"""
    model = generic_get_by_id('model_manage', id)
    if model:
        return jsonify({'code': 0, 'data': model})
    return jsonify({'code': 1, 'message': '模型不存在'})


@model_manage_bp.route('', methods=['POST'])
def create_model_manage():
    """创建模型"""
    data = request.json
    # 构建插入数据
    insert_data = {
        'name': data.get('name'),
        'type': data.get('type'),
        'model_source': data.get('model_source', 'local'),
        'description': data.get('description'),
        'purpose': data.get('purpose', 'inference')  # 默认推理用途
    }

    if data.get('model_source') == 'local':
        insert_data['path'] = data.get('path', '')
    else:
        insert_data['api_url'] = data.get('api_url', '')
        insert_data['api_key'] = data.get('api_key', '')
        insert_data['model_name'] = data.get('model_name', '')

    new_id = generic_create('model_manage', insert_data)
    return jsonify({'code': 0, 'message': '创建成功', 'id': new_id})


@model_manage_bp.route('/<int:id>', methods=['PUT'])
def update_model_manage(id):
    """更新模型"""
    data = request.json
    generic_update('model_manage', id, data)
    return jsonify({'code': 0, 'message': '更新成功'})


@model_manage_bp.route('/<int:id>/purpose', methods=['PUT'])
def update_model_purpose(id):
    """更新模型用途"""
    data = request.json
    purpose = data.get('purpose')
    if purpose not in ['training', 'inference', 'evaluation']:
        return jsonify({'code': 1, 'message': '无效的用途类型'})
    generic_update('model_manage', id, {'purpose': purpose})
    return jsonify({'code': 0, 'message': '更新成功'})


@model_manage_bp.route('/<int:id>', methods=['DELETE'])
def delete_model_manage(id):
    """删除模型"""
    generic_delete('model_manage', id)
    return jsonify({'code': 0, 'message': '删除成功'})


# ============ 本地模型列表接口 ============

@model_manage_bp.route('/local-models', methods=['GET'])
def get_local_models():
    """获取本地模型列表（从YG_FT_Base/local_models目录）"""
    import logging
    logger = logging.getLogger(__name__)

    try:
        # 使用 YG_FT_Base/local_models 目录
        base_path = os.path.join(PROJECT_ROOT, 'local_models')

        models = []
        if os.path.exists(base_path):
            for item in os.listdir(base_path):
                item_path = os.path.join(base_path, item)
                if os.path.isdir(item_path):
                    models.append({
                        'name': item,
                        'path': item_path
                    })

        return jsonify({
            'code': 0,
            'data': {
                'models': models,
                'base_path': base_path
            }
        })
    except Exception as e:
        logger.error(f"获取本地模型列表失败: {e}")
        return jsonify({'code': 1, 'message': str(e)})


# ============ 已训练模型列表接口 ============

@model_manage_bp.route('/trained-models', methods=['GET'])
def get_trained_models():
    """获取已训练模型列表（从/app/base/saves目录）"""
    import logging
    logger = logging.getLogger(__name__)

    try:
        # 使用 /app/base/saves 目录（容器内路径）
        saves_base_path = '/app/base/saves'
        # 本地开发时的备用路径
        local_saves_path = os.path.join(PROJECT_ROOT, 'saves')

        # 选择存在的路径
        base_path = saves_base_path if os.path.exists(saves_base_path) else local_saves_path

        logger.info(f"[DEBUG] 已训练模型目录: {base_path}, exists: {os.path.exists(base_path)}")

        models = []
        if os.path.exists(base_path):
            for item in os.listdir(base_path):
                item_path = os.path.join(base_path, item)
                if os.path.isdir(item_path):
                    # 检查是否是模板目录（包含训练方法的子目录）
                    sub_items = []
                    if os.path.exists(item_path):
                        for sub_item in os.listdir(item_path):
                            sub_path = os.path.join(item_path, sub_item)
                            if os.path.isdir(sub_path):
                                # 检查是否包含模型文件（adapter_model.bin 或 pytorch_model.bin 等）
                                has_model = False
                                for f in os.listdir(sub_path):
                                    if f.endswith('.bin') or f.endswith('.safetensors'):
                                        has_model = True
                                        break
                                if has_model:
                                    sub_items.append({
                                        'name': sub_item,
                                        'path': sub_path
                                    })

                    models.append({
                        'name': item,
                        'path': item_path,
                        'train_methods': sub_items
                    })

        logger.info(f"[DEBUG] 找到 {len(models)} 个已训练模型")

        return jsonify({
            'code': 0,
            'data': {
                'models': models,
                'base_path': base_path
            }
        })
    except Exception as e:
        logger.error(f"获取已训练模型列表失败: {e}")
        return jsonify({'code': 1, 'message': str(e)})