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

# 获取模块 logger（继承 main.py 的日志配置）
logger = logging.getLogger(__name__)

# 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 get_model_path_by_name(model_name):
    """根据模型名称查询模型路径（用于获取基座模型路径）"""
    logger.info(f"[DEBUG get_model_path_by_name] 查询模型: {model_name}")

    try:
        conn = get_db_connection()
        cursor = conn.cursor()

        # 优先从训练任务表查询基座模型
        logger.info(f"[DEBUG get_model_path_by_name] 尝试从fine_tune表查询...")
        cursor.execute("""
            SELECT base_model, output_model_name FROM fine_tune
            WHERE output_model_name LIKE %s OR output_model_name LIKE %s
            LIMIT 1
        """, (f'%/{model_name}', f'%{model_name}%'))
        ft_result = cursor.fetchone()
        logger.info(f"[DEBUG get_model_path_by_name] fine_tune查询结果: {ft_result}")

        if ft_result and ft_result.get('base_model'):
            base_model_val = ft_result['base_model']
            logger.info(f"[DEBUG get_model_path_by_name] base_model_val: {base_model_val}")
            # 如果是数字ID，查询模型管理表获取路径
            if str(base_model_val).isdigit():
                cursor.execute("SELECT path FROM model_manage WHERE id = %s LIMIT 1", (base_model_val,))
                model_result = cursor.fetchone()
                logger.info(f"[DEBUG get_model_path_by_name] model_manage查询结果(数字ID): {model_result}")
                if model_result:
                    cursor.close()
                    conn.close()
                    return model_result.get('path')
            else:
                # 直接是路径
                cursor.close()
                conn.close()
                return base_model_val

        # 如果训练任务表没找到，尝试从模型管理表按名称查询
        logger.info(f"[DEBUG get_model_path_by_name] 尝试从model_manage表查询...")
        cursor.execute("SELECT path FROM model_manage WHERE name = %s LIMIT 1", (model_name,))
        result = cursor.fetchone()
        logger.info(f"[DEBUG get_model_path_by_name] model_manage查询结果: {result}")
        cursor.close()
        conn.close()
        if result:
            return result.get('path')
        logger.info(f"[DEBUG get_model_path_by_name] 未找到任何匹配，返回None")
        return None
    except Exception as e:
        logger.error(f"[ERROR] 查询模型路径失败: {e}")
        return None


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('/name/<model_name>', methods=['GET'])
def get_model_manage_by_name(model_name):
    """根据名称获取模型"""
    logger.info(f"[DEBUG] 按名称查询模型: {model_name}")

    conn = get_db_connection()
    cursor = conn.cursor()
    cursor.execute("SELECT * FROM model_manage WHERE name = %s LIMIT 1", (model_name,))
    model = cursor.fetchone()
    cursor.close()
    conn.close()

    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:
        # 多个可能的路径
        potential_paths = [
            '/app/base/saves',           # 容器内路径
            os.path.join(PROJECT_ROOT, 'saves'),  # 本地开发路径
            os.path.join(os.path.dirname(os.path.dirname(PROJECT_ROOT)), 'YG_FT_Base', 'saves'),  # 上级目录
        ]

        base_path = None
        for path in potential_paths:
            logger.info(f"[DEBUG] 检查路径: {path}, exists: {os.path.exists(path)}")
            if os.path.exists(path):
                base_path = path
                break

        logger.info(f"[DEBUG] 最终使用的路径: {base_path}")

        models = []
        if base_path and os.path.exists(base_path):
            logger.info(f"[DEBUG] 遍历目录: {base_path}")
            try:
                # 路径结构: /app/base/saves/{train_method}/{model_name}/
                # train_method: lora, full, qlora, dpo, cpt 等
                # 同时兼容老结构: /app/base/saves/{model_name}/

                train_methods = ['lora', 'full', 'qlora', 'dpo', 'cpt', 'prefix', 'adapter', 'peft']

                for item in os.listdir(base_path):
                    item_path = os.path.join(base_path, item)
                    if not os.path.isdir(item_path):
                        continue

                    # 情况1: 新结构 {train_method}/{model_name}
                    if item in train_methods:
                        logger.info(f"[DEBUG] 检查训练方法目录: {item}")
                        model_count = 0

                        for model_name in os.listdir(item_path):
                            model_path = os.path.join(item_path, model_name)
                            if not os.path.isdir(model_path):
                                continue

                            try:
                                files = os.listdir(model_path)
                                has_model = any(f.endswith('.bin') or f.endswith('.safetensors') for f in files)

                                if has_model:
                                    logger.info(f"[DEBUG] 找到模型: {item}/{model_name}")
                                    # 获取文件创建时间
                                    try:
                                        import time
                                        stat = os.stat(model_path)
                                        create_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(stat.st_mtime))
                                    except:
                                        create_time = None

                                    # 查询基座模型路径
                                    base_model_path = get_model_path_by_name(model_name)

                                    models.append({
                                        'name': model_name,
                                        'path': model_path,
                                        'base_model_path': base_model_path,
                                        'create_time': create_time,
                                        'train_methods': [{
                                            'name': item,
                                            'path': model_path
                                        }]
                                    })
                                    model_count += 1
                            except Exception as file_err:
                                logger.error(f"[DEBUG] 读取 {model_path} 失败: {file_err}")

                        logger.info(f"[DEBUG] {item} 找到 {model_count} 个模型")

                    # 情况2: 老结构 {model_name} 直接在 saves 下
                    else:
                        logger.info(f"[DEBUG] 检查老结构模型目录: {item}")
                        try:
                            files = os.listdir(item_path)
                            has_model = any(f.endswith('.bin') or f.endswith('.safetensors') for f in files)

                            if has_model:
                                logger.info(f"[DEBUG] 找到模型: {item}")

                                # 尝试从 adapter_config.json 推断 train_method
                                inferred_method = 'lora'  # 默认
                                config_file = os.path.join(item_path, 'adapter_config.json')
                                if os.path.exists(config_file):
                                    try:
                                        import json
                                        with open(config_file, 'r', encoding='utf-8') as f:
                                            config = json.load(f)
                                            if 'peft_type' in config:
                                                peft_type = config['peft_type'].lower()
                                                if 'lora' in peft_type:
                                                    inferred_method = 'lora'
                                                elif 'full' in peft_type or 'pt' in peft_type:
                                                    inferred_method = 'full'
                                    except:
                                        pass

                                # 获取文件创建时间
                                try:
                                    import time
                                    stat = os.stat(item_path)
                                    create_time = time.strftime('%Y-%m-%d %H:%M:%S', time.localtime(stat.st_mtime))
                                except:
                                    create_time = None

                                # 查询基座模型路径
                                base_model_path = get_model_path_by_name(item)

                                models.append({
                                    'name': item,
                                    'path': item_path,
                                    'base_model_path': base_model_path,
                                    'create_time': create_time,
                                    'train_methods': [{
                                        'name': inferred_method,
                                        'path': item_path
                                    }]
                                })
                        except Exception as file_err:
                            logger.error(f"[DEBUG] 读取 {item_path} 失败: {file_err}")

            except Exception as list_err:
                logger.error(f"[DEBUG] 遍历目录失败: {list_err}")

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

        # 检查每个模型是否已合并或正在合并
        local_trained_path = os.path.join(PROJECT_ROOT, 'local_trained_models')
        for model in models:
            model_name = model['name']
            merged_path = os.path.join(local_trained_path, model_name)
            lock_file = os.path.join(local_trained_path, f'.merging_{model_name}.lock')
            model['merged'] = os.path.exists(merged_path)
            model['merging'] = os.path.exists(lock_file)
            logger.info(f"[DEBUG] 模型 {model_name} 已合并: {model['merged']}, 正在合并: {model['merging']}")

        return jsonify({
            'code': 0,
            'data': {
                'models': models,
                'base_path': base_path or ''
            }
        })
    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)})


# ============ 合并权重接口 ============

@model_manage_bp.route('/merge', methods=['POST'])
def merge_model():
    """合并模型权重（将LoRA适配器合并到基座模型）"""
    import subprocess
    import sys
    import logging
    logger = logging.getLogger(__name__)

    data = request.json
    model_name = data.get('model_name')  # 模型名称
    train_method = data.get('train_method', 'lora')  # 训练方法
    base_model_path = data.get('base_model_path')  # 基座模型路径

    if not model_name:
        return jsonify({'code': 1, 'message': '缺少模型名称'})

    logger.info(f"[MERGE] 开始合并模型: {model_name}, 方法: {train_method}")

    # 如果没有提供基座模型路径，从数据库查询
    if not base_model_path:
        try:
            conn = get_db_connection()
            cursor = conn.cursor()

            # 优先从训练任务表查询
            cursor.execute("""
                SELECT base_model FROM fine_tune
                WHERE output_model_name LIKE %s OR output_model_name LIKE %s
                LIMIT 1
            """, (f'%/{model_name}', f'%{model_name}%'))
            ft_result = cursor.fetchone()

            if ft_result and ft_result.get('base_model'):
                base_model_val = ft_result['base_model']
                if str(base_model_val).isdigit():
                    cursor.execute("SELECT path FROM model_manage WHERE id = %s LIMIT 1", (base_model_val,))
                    model_result = cursor.fetchone()
                    if model_result:
                        base_model_path = model_result.get('path')
                else:
                    base_model_path = base_model_val

            # 如果没找到，尝试从模型管理表按名称查询
            if not base_model_path:
                cursor.execute("SELECT path FROM model_manage WHERE name = %s LIMIT 1", (model_name,))
                model_result = cursor.fetchone()
                if model_result:
                    base_model_path = model_result.get('path')

            conn.close()

            if not base_model_path:
                return jsonify({'code': 1, 'message': f'未找到模型 {model_name} 的基座模型配置'})
        except Exception as e:
            logger.error(f"[MERGE] 查询模型配置失败: {e}")
            return jsonify({'code': 1, 'message': f'查询模型配置失败: {str(e)}'})

    # 训练后的模型路径（LoRA适配器）
    adapter_path = f"/app/base/saves/{train_method}/{model_name}"

    # 检查路径是否存在
    if not os.path.exists(adapter_path):
        return jsonify({'code': 1, 'message': f'训练模型不存在: {adapter_path}'})

    # 合并后的输出路径
    output_path = f"/app/base/local_trained_models/{model_name}"

    # 合并状态锁文件
    lock_file = f"/app/base/local_trained_models/.merging_{model_name}.lock"

    # 创建输出目录
    os.makedirs(output_path, exist_ok=True)

    # 创建锁文件表示正在合并中
    try:
        with open(lock_file, 'w') as f:
            f.write('merging')

        work_dir = '/app/base'

        # 设置环境变量
        env = {**os.environ, 'CUDA_VISIBLE_DEVICES': '0'}

        # 使用 llamafactory-cli export 命令（假设已在系统 PATH 中，与训练命令一致）
        cli_cmd = ['llamafactory-cli', 'export']

        # 检查 llamafactory-cli 是否存在
        try:
            # 尝试使用 which 命令（Linux/Mac）
            subprocess.run(['which', 'llamafactory-cli'], capture_output=True, check=True)
        except (subprocess.CalledProcessError, FileNotFoundError):
            # Windows 上没有 which 命令，直接尝试执行
            logger.info("[MERGE] which 命令不可用，直接尝试执行 llamafactory-cli")

        # 构建完整命令参数
        export_args = [
            '--model_name_or_path', base_model_path,
            '--adapter_name_or_path', adapter_path,
            '--export_dir', output_path
        ]

        logger.info(f"[MERGE] 执行合并命令: {' '.join(cli_cmd)} {' '.join(export_args)}")

        # 直接执行 llamafactory-cli export 命令
        result = subprocess.run(
            cli_cmd + export_args,
            capture_output=True,
            text=True,
            timeout=600,
            cwd=work_dir or '/app/base',
            env=env
        )

        logger.info(f"[MERGE] 命令返回码: {result.returncode}")
        logger.info(f"[MERGE] stdout: {result.stdout[:500] if result.stdout else 'empty'}")
        logger.info(f"[MERGE] stderr: {result.stderr[:500] if result.stderr else 'empty'}")

        # 等待输出目录完全创建
        import time
        max_wait = 5  # 最多等待5秒
        waited = 0
        while not os.path.exists(output_path) and waited < max_wait:
            time.sleep(0.5)
            waited += 0.5

        # 无论成功失败，都删除锁文件
        if os.path.exists(lock_file):
            os.remove(lock_file)

        if result.returncode == 0:
            # 确保目录存在才返回成功
            if os.path.exists(output_path):
                return jsonify({
                    'code': 0,
                    'message': f'模型权重已成功合并到 {output_path}',
                    'data': {
                        'model_name': model_name,
                        'output_path': output_path
                    }
                })
            else:
                return jsonify({'code': 1, 'message': '合并失败：输出目录未创建'})
        else:
            error_msg = result.stderr.strip() if result.stderr else result.stdout.strip()
            if not error_msg:
                error_msg = f'命令执行失败，返回码: {result.returncode}'
            return jsonify({'code': 1, 'message': f'合并失败: {error_msg}'})

    except subprocess.TimeoutExpired:
        logger.error("[MERGE] 合并超时")
        # 删除锁文件
        if os.path.exists(lock_file):
            os.remove(lock_file)
        return jsonify({'code': 1, 'message': '合并超时，请稍后重试'})
    except Exception as e:
        logger.error(f"[MERGE] 合并异常: {str(e)}")
        return jsonify({'code': 1, 'message': f'合并异常: {str(e)}'})


# ============ 删除已训练模型接口 ============

@model_manage_bp.route('/trained-models/<model_name>', methods=['DELETE'])
def delete_trained_model(model_name):
    """删除已训练模型
    type=merged: 删除合并模型（local_trained_models目录）
    type=lora: 删除权重（saves目录下的lora等权重文件）
    """
    import shutil
    import logging
    logger = logging.getLogger(__name__)

    # 获取删除类型参数
    delete_type = request.args.get('type', 'merged')  # 默认删除合并模型

    try:
        if delete_type == 'lora':
            # 删除权重：删除 saves 目录下的权重
            saves_path = os.path.join(PROJECT_ROOT, 'saves')
            train_methods = ['lora', 'full', 'qlora', 'dpo', 'cpt', 'prefix', 'adapter', 'peft']

            deleted = False
            for method in train_methods:
                weight_path = os.path.join(saves_path, method, model_name)
                if os.path.exists(weight_path):
                    shutil.rmtree(weight_path)
                    logger.info(f"[DELETE] 已删除权重: {weight_path}")
                    deleted = True

            if not deleted:
                # 也可能是老结构，直接在 saves 下的 model_name 目录
                old_path = os.path.join(saves_path, model_name)
                if os.path.exists(old_path):
                    shutil.rmtree(old_path)
                    logger.info(f"[DELETE] 已删除老结构权重: {old_path}")
                    deleted = True

            if deleted:
                return jsonify({'code': 0, 'message': '权重已删除'})
            else:
                return jsonify({'code': 1, 'message': f'权重不存在: {model_name}'})
        else:
            # 默认删除合并模型（local_trained_models目录）
            model_path = os.path.join(PROJECT_ROOT, 'local_trained_models', model_name)

            if not os.path.exists(model_path):
                return jsonify({'code': 1, 'message': f'合并模型不存在: {model_name}'})

            # 删除目录
            shutil.rmtree(model_path)
            logger.info(f"[DELETE] 已删除合并模型: {model_path}")

            return jsonify({'code': 0, 'message': '合并模型已删除'})
    except Exception as e:
        logger.error(f"[DELETE] 删除失败: {str(e)}")
        return jsonify({'code': 1, 'message': f'删除失败: {str(e)}'})


# ============ 导出已训练模型接口 ============

@model_manage_bp.route('/trained-models/<model_name>/export', methods=['GET'])
def export_trained_model(model_name):
    """导出已训练模型（打包成zip下载）"""
    import shutil
    import logging
    from flask import send_file
    logger = logging.getLogger(__name__)

    try:
        # 优先从 local_trained_models 目录查找（合并后的模型）
        model_path = os.path.join(PROJECT_ROOT, 'local_trained_models', model_name)

        # 如果本地模型目录不存在，尝试从 saves 目录查找（未合并的模型）
        if not os.path.exists(model_path):
            # 查找 saves 目录下的模型
            saves_path = os.path.join(PROJECT_ROOT, 'saves')
            train_methods = ['lora', 'full', 'qlora', 'dpo', 'cpt', 'prefix', 'adapter', 'peft']

            for method in train_methods:
                potential_path = os.path.join(saves_path, method, model_name)
                if os.path.exists(potential_path):
                    model_path = potential_path
                    logger.info(f"[EXPORT] 从 saves/{method} 目录找到模型: {model_path}")
                    break

        # 如果还是找不到，返回错误
        if not os.path.exists(model_path):
            return jsonify({'code': 1, 'message': f'模型不存在: {model_name}'})

        # 创建临时 zip 文件
        zip_path = os.path.join(PROJECT_ROOT, 'temp_exports')
        os.makedirs(zip_path, exist_ok=True)

        zip_file = os.path.join(zip_path, f'{model_name}.zip')

        # 如果已存在先删除
        if os.path.exists(zip_file):
            os.remove(zip_file)

        # 打包成 zip
        shutil.make_archive(zip_file[:-4], 'zip', model_path)
        logger.info(f"[EXPORT] 已打包模型: {zip_file}")

        # 发送文件给前端
        response = send_file(
            zip_file,
            as_attachment=True,
            download_name=f'{model_name}.zip',
            mimetype='application/zip'
        )

        # 注册回调，删除临时文件
        def cleanup():
            try:
                if os.path.exists(zip_file):
                    os.remove(zip_file)
                    logger.info(f"[EXPORT] 已清理临时文件: {zip_file}")
            except:
                pass

        # 使用 after_request 清理
        @response.call_on_close
        def cleanup_after_request():
            cleanup()

        return response

    except Exception as e:
        logger.error(f"[EXPORT] 导出模型失败: {str(e)}")
        return jsonify({'code': 1, 'message': f'导出失败: {str(e)}'})