from fastapi import APIRouter, HTTPException, Depends
from app.models.models import (
    ClientDownload,
    CreateClientDownloadRequest,
    UpdateClientDownloadRequest,
    ClientDownloadListResponse
)
from app.core.database import get_db_connection
from app.core.auth import get_current_user, get_current_admin_user
from app.core.response import create_api_response
from typing import Optional

router = APIRouter()

@router.get("/downloads", response_model=dict)
async def get_client_downloads(
    platform_type: Optional[str] = None,
    platform_name: Optional[str] = None,
    is_active: Optional[bool] = None,
    page: int = 1,
    size: int = 50
):
    """
    获取客户端下载列表（公开接口，所有用户可访问）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor(dictionary=True)

            # 构建查询条件
            where_clauses = []
            params = []

            if platform_type:
                where_clauses.append("platform_type = %s")
                params.append(platform_type)

            if platform_name:
                where_clauses.append("platform_name = %s")
                params.append(platform_name)

            if is_active is not None:
                where_clauses.append("is_active = %s")
                params.append(is_active)

            where_clause = " AND ".join(where_clauses) if where_clauses else "1=1"

            # 获取总数
            count_query = f"SELECT COUNT(*) as total FROM client_downloads WHERE {where_clause}"
            cursor.execute(count_query, params)
            total = cursor.fetchone()['total']

            # 获取列表数据
            offset = (page - 1) * size
            list_query = f"""
                SELECT * FROM client_downloads
                WHERE {where_clause}
                ORDER BY platform_type, platform_name, version_code DESC
                LIMIT %s OFFSET %s
            """
            cursor.execute(list_query, params + [size, offset])
            clients = cursor.fetchall()

            cursor.close()

            return create_api_response(
                code="200",
                message="获取成功",
                data={
                    "clients": clients,
                    "total": total,
                    "page": page,
                    "size": size
                }
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"获取客户端下载列表失败: {str(e)}"
        )


@router.get("/downloads/latest", response_model=dict)
async def get_latest_clients():
    """
    获取所有平台的最新版本客户端（公开接口，用于首页下载）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor(dictionary=True)

            query = """
                SELECT * FROM client_downloads
                WHERE is_active = TRUE AND is_latest = TRUE
                ORDER BY platform_type, platform_name
            """
            cursor.execute(query)
            clients = cursor.fetchall()
            cursor.close()

            # 按平台类型分组
            mobile_clients = []
            desktop_clients = []

            for client in clients:
                if client['platform_type'] == 'mobile':
                    mobile_clients.append(client)
                else:
                    desktop_clients.append(client)

            return create_api_response(
                code="200",
                message="获取成功",
                data={
                    "mobile": mobile_clients,
                    "desktop": desktop_clients
                }
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"获取最新客户端失败: {str(e)}"
        )


@router.get("/downloads/{platform_name}/latest", response_model=dict)
async def get_latest_version_by_platform(platform_name: str):
    """
    获取指定平台的最新版本（公开接口，用于客户端版本检查）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor(dictionary=True)

            query = """
                SELECT * FROM client_downloads
                WHERE platform_name = %s AND is_active = TRUE AND is_latest = TRUE
                LIMIT 1
            """
            cursor.execute(query, (platform_name,))
            client = cursor.fetchone()
            cursor.close()

            if not client:
                return create_api_response(
                    code="404",
                    message=f"未找到平台 {platform_name} 的客户端"
                )

            return create_api_response(
                code="200",
                message="获取成功",
                data=client
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"获取客户端版本失败: {str(e)}"
        )


@router.get("/downloads/{id}", response_model=dict)
async def get_client_download_by_id(id: int):
    """
    获取指定ID的客户端详情（公开接口）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor(dictionary=True)

            query = "SELECT * FROM client_downloads WHERE id = %s"
            cursor.execute(query, (id,))
            client = cursor.fetchone()
            cursor.close()

            if not client:
                return create_api_response(
                    code="404",
                    message="客户端不存在"
                )

            return create_api_response(
                code="200",
                message="获取成功",
                data=client
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"获取客户端详情失败: {str(e)}"
        )


@router.post("/downloads", response_model=dict)
async def create_client_download(
    request: CreateClientDownloadRequest,
    current_user: dict = Depends(get_current_admin_user)
):
    """
    创建新的客户端版本（仅管理员）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor()

            # 如果设置为最新版本,先将同平台的其他版本设为非最新
            if request.is_latest:
                update_query = """
                    UPDATE client_downloads
                    SET is_latest = FALSE
                    WHERE platform_name = %s
                """
                cursor.execute(update_query, (request.platform_name,))

            # 插入新版本
            insert_query = """
                INSERT INTO client_downloads (
                    platform_type, platform_name, version, version_code,
                    download_url, file_size, release_notes, is_active,
                    is_latest, min_system_version, created_by
                ) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)
            """
            cursor.execute(insert_query, (
                request.platform_type,
                request.platform_name,
                request.version,
                request.version_code,
                request.download_url,
                request.file_size,
                request.release_notes,
                request.is_active,
                request.is_latest,
                request.min_system_version,
                current_user['user_id']
            ))

            new_id = cursor.lastrowid
            conn.commit()
            cursor.close()

            return create_api_response(
                code="200",
                message="客户端版本创建成功",
                data={"id": new_id}
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"创建客户端版本失败: {str(e)}"
        )


@router.put("/downloads/{id}", response_model=dict)
async def update_client_download(
    id: int,
    request: UpdateClientDownloadRequest,
    current_user: dict = Depends(get_current_admin_user)
):
    """
    更新客户端版本信息（仅管理员）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor(dictionary=True)

            # 检查客户端是否存在
            cursor.execute("SELECT * FROM client_downloads WHERE id = %s", (id,))
            existing = cursor.fetchone()
            if not existing:
                cursor.close()
                return create_api_response(
                    code="404",
                    message="客户端不存在"
                )

            # 如果设置为最新版本,先将同平台的其他版本设为非最新
            if request.is_latest:
                update_query = """
                    UPDATE client_downloads
                    SET is_latest = FALSE
                    WHERE platform_name = %s AND id != %s
                """
                cursor.execute(update_query, (existing['platform_name'], id))

            # 构建更新语句
            update_fields = []
            params = []

            if request.version is not None:
                update_fields.append("version = %s")
                params.append(request.version)

            if request.version_code is not None:
                update_fields.append("version_code = %s")
                params.append(request.version_code)

            if request.download_url is not None:
                update_fields.append("download_url = %s")
                params.append(request.download_url)

            if request.file_size is not None:
                update_fields.append("file_size = %s")
                params.append(request.file_size)

            if request.release_notes is not None:
                update_fields.append("release_notes = %s")
                params.append(request.release_notes)

            if request.is_active is not None:
                update_fields.append("is_active = %s")
                params.append(request.is_active)

            if request.is_latest is not None:
                update_fields.append("is_latest = %s")
                params.append(request.is_latest)

            if request.min_system_version is not None:
                update_fields.append("min_system_version = %s")
                params.append(request.min_system_version)

            if not update_fields:
                cursor.close()
                return create_api_response(
                    code="400",
                    message="没有要更新的字段"
                )

            # 执行更新
            update_query = f"""
                UPDATE client_downloads
                SET {', '.join(update_fields)}
                WHERE id = %s
            """
            params.append(id)
            cursor.execute(update_query, params)
            conn.commit()
            cursor.close()

            return create_api_response(
                code="200",
                message="客户端版本更新成功"
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"更新客户端版本失败: {str(e)}"
        )


@router.delete("/downloads/{id}", response_model=dict)
async def delete_client_download(
    id: int,
    current_user: dict = Depends(get_current_admin_user)
):
    """
    删除客户端版本（仅管理员）
    """
    try:
        with get_db_connection() as conn:
            cursor = conn.cursor()

            # 检查是否存在
            cursor.execute("SELECT * FROM client_downloads WHERE id = %s", (id,))
            if not cursor.fetchone():
                cursor.close()
                return create_api_response(
                    code="404",
                    message="客户端不存在"
                )

            # 执行删除
            cursor.execute("DELETE FROM client_downloads WHERE id = %s", (id,))
            conn.commit()
            cursor.close()

            return create_api_response(
                code="200",
                message="客户端版本删除成功"
            )

    except Exception as e:
        return create_api_response(
            code="500",
            message=f"删除客户端版本失败: {str(e)}"
        )