"""
项目管理相关 API
"""
from fastapi import APIRouter, Depends, HTTPException, Request
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, or_
from typing import List
import uuid

from app.core.database import get_db
from app.core.deps import get_current_user
from app.models.user import User
from app.models.project import Project, ProjectMember
from app.models.git_repo import ProjectGitRepo
from app.schemas.project import (
    ProjectCreate,
    ProjectUpdate,
    ProjectResponse,
    ProjectMemberAdd,
    ProjectMemberUpdate,
    ProjectMemberResponse,
    ProjectShareSettings,
    ProjectShareInfo,
)
from app.schemas.response import success_response
from app.services.storage import storage_service
from app.services.log_service import log_service
from app.services.git_service import git_service
from app.services.notification_service import notification_service
from app.core.enums import OperationType, ResourceType

router = APIRouter()


def get_document_count(storage_key: str) -> int:
    """计算项目中的文档数量（.md 和 .pdf）"""
    try:
        project_path = storage_service.get_secure_path(storage_key)
        if not project_path.exists():
            return 0
        md_count = len(list(project_path.rglob("*.md")))
        pdf_count = len(list(project_path.rglob("*.pdf")))
        # 排除 _assets 目录下的文件
        assets_md = len(list((project_path / "_assets").rglob("*.md"))) if (project_path / "_assets").exists() else 0
        assets_pdf = len(list((project_path / "_assets").rglob("*.pdf"))) if (project_path / "_assets").exists() else 0
        return md_count + pdf_count - assets_md - assets_pdf
    except Exception:
        return 0


@router.get("/", response_model=dict)
async def get_my_projects(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取我的项目列表（包括创建的和协作的）"""
    # 查询我创建的项目
    owned_result = await db.execute(
        select(Project).where(Project.owner_id == current_user.id, Project.status == 1)
    )
    owned_projects = owned_result.scalars().all()

    # 查询我协作的项目
    member_result = await db.execute(
        select(Project)
        .join(ProjectMember, ProjectMember.project_id == Project.id)
        .where(
            ProjectMember.user_id == current_user.id,
            Project.owner_id != current_user.id,
            Project.status == 1
        )
    )
    member_projects = member_result.scalars().all()

    # 合并结果
    all_projects = owned_projects + member_projects
    projects_data = []
    for p in all_projects:
        p_dict = ProjectResponse.from_orm(p).dict()
        p_dict['doc_count'] = get_document_count(p.storage_key)
        projects_data.append(p_dict)

    return success_response(data=projects_data)


@router.get("/my", response_model=dict)
async def get_owned_projects(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取我创建的项目列表"""
    result = await db.execute(
        select(Project).where(Project.owner_id == current_user.id, Project.status == 1)
    )
    projects = result.scalars().all()
    projects_data = []
    for p in projects:
        p_dict = ProjectResponse.from_orm(p).dict()
        p_dict['doc_count'] = get_document_count(p.storage_key)
        projects_data.append(p_dict)
    return success_response(data=projects_data)


@router.get("/shared", response_model=dict)
async def get_shared_projects(
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取我参与的项目列表（不包括我创建的）"""
    result = await db.execute(
        select(Project, User, ProjectMember)
        .join(ProjectMember, ProjectMember.project_id == Project.id)
        .join(User, User.id == Project.owner_id)
        .where(
            ProjectMember.user_id == current_user.id,
            Project.owner_id != current_user.id,
            Project.status == 1
        )
    )
    projects_with_info = result.all()

    projects_data = []
    for project, owner, member in projects_with_info:
        project_dict = ProjectResponse.from_orm(project).dict()
        project_dict['owner_name'] = owner.username
        project_dict['owner_nickname'] = owner.nickname
        project_dict['user_role'] = member.role  # 添加用户角色
        project_dict['doc_count'] = get_document_count(project.storage_key)
        projects_data.append(project_dict)

    return success_response(data=projects_data)


@router.post("/", response_model=dict)
async def create_project(
    project_in: ProjectCreate,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """创建新项目"""
    # 生成 UUID 作为存储键
    storage_key = str(uuid.uuid4())

    # 创建项目记录
    db_project = Project(
        name=project_in.name,
        description=project_in.description,
        storage_key=storage_key,
        owner_id=current_user.id,
        is_public=project_in.is_public,
        status=1,
    )
    db.add(db_project)
    await db.commit()
    await db.refresh(db_project)

    # 创建物理文件夹结构
    try:
        storage_service.create_project_structure(storage_key)
    except Exception as e:
        # 如果文件夹创建失败，回滚数据库记录
        await db.delete(db_project)
        await db.commit()
        raise HTTPException(status_code=500, detail=f"项目文件夹创建失败: {str(e)}")

    # 添加项目所有者为管理员成员
    db_member = ProjectMember(
        project_id=db_project.id,
        user_id=current_user.id,
        role="admin",
    )
    db.add(db_member)
    await db.commit()

    # 记录操作日志
    await log_service.log_project_operation(
        db=db,
        operation_type=OperationType.CREATE_PROJECT,
        project_id=db_project.id,
        user=current_user,
        detail={"project_name": project_in.name},
        request=request,
    )

    project_data = ProjectResponse.from_orm(db_project)
    return success_response(data=project_data.dict(), message="项目创建成功")


@router.get("/{project_id}", response_model=dict)
async def get_project(
    project_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取项目详情"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查权限（项目所有者或成员可访问）
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id
            )
        )
        member = member_result.scalar_one_or_none()
        if not member and project.is_public != 1:
            raise HTTPException(status_code=403, detail="无权访问该项目")

    # 增加访问次数 (简单计数)
    project.visit_count += 1
    await db.commit()

    project_data = ProjectResponse.from_orm(project)
    return success_response(data=project_data.dict())


@router.put("/{project_id}", response_model=dict)
async def update_project(
    project_id: int,
    project_in: ProjectUpdate,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """更新项目信息"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 只有项目所有者可以更新
    if project.owner_id != current_user.id:
        raise HTTPException(status_code=403, detail="无权修改该项目")

    # 更新字段
    update_data = project_in.dict(exclude_unset=True)
    for field, value in update_data.items():
        setattr(project, field, value)

    await db.commit()
    await db.refresh(project)

    # 记录操作日志
    await log_service.log_project_operation(
        db=db,
        operation_type=OperationType.UPDATE_PROJECT,
        project_id=project_id,
        user=current_user,
        detail={"updated_fields": list(update_data.keys())},
        request=request,
    )

    project_data = ProjectResponse.from_orm(project)
    return success_response(data=project_data.dict(), message="项目更新成功")


@router.delete("/{project_id}", response_model=dict)
async def delete_project(
    project_id: int,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """删除项目"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 只有项目所有者可以删除
    if project.owner_id != current_user.id:
        raise HTTPException(status_code=403, detail="无权删除该项目")

    # 检查项目目录下是否有文件（排除_assets目录和隐藏文件）
    project_root = storage_service.get_secure_path(project.storage_key)

    has_files = False
    if project_root.exists() and project_root.is_dir():
        for item in project_root.iterdir():
            # 跳过 _assets 目录和以.开头的隐藏文件（如.DS_Store）
            if item.name == "_assets" or item.name.startswith("."):
                continue
            has_files = True
            break

    if has_files:
        raise HTTPException(
            status_code=400,
            detail="项目目录下存在文件，无法删除。请先清空项目文件。"
        )

    # 删除物理目录
    if project_root.exists():
        import shutil
        try:
            shutil.rmtree(project_root)
        except Exception as e:
            raise HTTPException(
                status_code=500,
                detail=f"删除项目目录失败: {str(e)}"
            )

    project_name = project.name

    # 删除数据库记录
    await db.delete(project)
    await db.commit()

    # 记录操作日志
    await log_service.log_project_operation(
        db=db,
        operation_type=OperationType.DELETE_PROJECT,
        project_id=project_id,
        user=current_user,
        detail={"project_name": project_name},
        request=request,
    )

    return success_response(message="项目已删除")


@router.get("/{project_id}/members", response_model=dict)
async def get_project_members(
    project_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取项目成员列表"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查权限
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id
            )
        )
        member = member_result.scalar_one_or_none()
        if not member:
            raise HTTPException(status_code=403, detail="无权访问该项目")

    # 查询成员列表并关联用户信息
    members_result = await db.execute(
        select(ProjectMember, User)
        .join(User, ProjectMember.user_id == User.id)
        .where(ProjectMember.project_id == project_id)
    )
    members_with_users = members_result.all()

    # 构建返回数据，包含用户名信息
    members_data = []
    for member, user in members_with_users:
        members_data.append({
            "id": member.id,
            "project_id": member.project_id,
            "user_id": member.user_id,
            "role": member.role,
            "joined_at": member.joined_at.isoformat() if member.joined_at else None,
            "username": user.username,
            "nickname": user.nickname,
        })

    return success_response(data=members_data)


@router.post("/{project_id}/members", response_model=dict)
async def add_project_member(
    project_id: int,
    member_in: ProjectMemberAdd,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """添加项目成员"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 只有项目所有者和管理员可以添加成员
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id,
                ProjectMember.role == "admin"
            )
        )
        member = member_result.scalar_one_or_none()
        if not member:
            raise HTTPException(status_code=403, detail="无权添加成员")

    # 检查用户是否已是成员
    existing_result = await db.execute(
        select(ProjectMember).where(
            ProjectMember.project_id == project_id,
            ProjectMember.user_id == member_in.user_id
        )
    )
    existing_member = existing_result.scalar_one_or_none()
    if existing_member:
        raise HTTPException(status_code=400, detail="用户已是项目成员")

    # 添加成员
    db_member = ProjectMember(
        project_id=project_id,
        user_id=member_in.user_id,
        role=member_in.role,
        invited_by=current_user.id,
    )
    db.add(db_member)
    await db.commit()
    await db.refresh(db_member)

    # 发送通知给被邀请人
    await notification_service.create_notification(
        db=db,
        user_id=member_in.user_id,
        title=f"新项目协作邀请",
        content=f"用户 {current_user.nickname or current_user.username} 邀请您参与项目 [{project.name}] 的协作。",
        category="collaboration",
        link=f"/projects/{project_id}/docs",
        type="info"
    )
    await db.commit()

    # 记录操作日志
    await log_service.log_member_operation(
        db=db,
        operation_type=OperationType.ADD_MEMBER,
        project_id=project_id,
        target_user_id=member_in.user_id,
        user=current_user,
        detail={"role": member_in.role},
        request=request,
    )

    member_data = ProjectMemberResponse.from_orm(db_member)
    return success_response(data=member_data.dict(), message="成员添加成功")


@router.delete("/{project_id}/members/{user_id}", response_model=dict)
async def remove_project_member(
    project_id: int,
    user_id: int,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """删除项目成员"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 只有项目所有者和管理员可以删除成员
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id,
                ProjectMember.role == "admin"
            )
        )
        member = member_result.scalar_one_or_none()
        if not member:
            raise HTTPException(status_code=403, detail="无权删除成员")

    # 不能删除项目所有者
    if user_id == project.owner_id:
        raise HTTPException(status_code=400, detail="不能删除项目所有者")

    # 查询要删除的成员
    member_result = await db.execute(
        select(ProjectMember).where(
            ProjectMember.project_id == project_id,
            ProjectMember.user_id == user_id
        )
    )
    member = member_result.scalar_one_or_none()

    if not member:
        raise HTTPException(status_code=404, detail="成员不存在")

    # 删除成员
    await db.delete(member)
    await db.commit()

    # 记录操作日志
    await log_service.log_member_operation(
        db=db,
        operation_type=OperationType.REMOVE_MEMBER,
        project_id=project_id,
        target_user_id=user_id,
        user=current_user,
        request=request,
    )

    return success_response(message="成员删除成功")


@router.get("/{project_id}/share", response_model=dict)
async def get_project_share_info(
    project_id: int,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """获取项目分享信息"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查是否是项目所有者或成员
    is_owner = project.owner_id == current_user.id
    if not is_owner:
        # 检查是否是项目成员
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id
            )
        )
        member = member_result.scalar_one_or_none()
        if not member:
            raise HTTPException(status_code=403, detail="无权访问该项目")

    # 构建分享链接
    share_url = f"/preview/{project_id}"

    # 只有项目所有者可以看到实际密码，成员只能知道是否设置了密码
    share_info = ProjectShareInfo(
        share_url=share_url,
        has_password=bool(project.access_pass),
        access_pass=project.access_pass if is_owner else None
    )

    return success_response(data=share_info.dict())


@router.post("/{project_id}/share/settings", response_model=dict)
async def update_share_settings(
    project_id: int,
    settings: ProjectShareSettings,
    request: Request,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """更新分享设置（设置或取消访问密码）"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 只有项目所有者可以修改分享设置
    if project.owner_id != current_user.id:
        raise HTTPException(status_code=403, detail="只有项目所有者可以修改分享设置")

    # 更新访问密码
    project.access_pass = settings.access_pass
    await db.commit()

    # 记录操作日志
    await log_service.log_operation(
        db=db,
        operation_type=OperationType.UPDATE_SHARE_SETTINGS,
        resource_type=ResourceType.SHARE,
        user=current_user,
        resource_id=project_id,
        detail={
            "has_password": bool(settings.access_pass),
            "project_name": project.name,
        },
        request=request,
    )

    message = "访问密码已取消" if not settings.access_pass else "访问密码已设置"
    return success_response(message=message)


@router.post("/{project_id}/git/pull", response_model=dict)
async def git_pull(
    project_id: int,
    request: Request,
    repo_id: int = None,
    force: bool = False,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """执行 Git Pull"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 权限检查：需要是所有者或管理员/编辑者
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id,
                ProjectMember.role.in_(['admin', 'editor'])
            )
        )
        if not member_result.scalar_one_or_none():
            raise HTTPException(status_code=403, detail="无权执行Git操作")

    # 获取Git仓库配置
    query = select(ProjectGitRepo).where(ProjectGitRepo.project_id == project_id)
    if repo_id:
        query = query.where(ProjectGitRepo.id == repo_id)
    else:
        # 优先使用默认仓库，然后按创建时间倒序（最新的）
        query = query.order_by(ProjectGitRepo.is_default.desc(), ProjectGitRepo.created_at.desc())
    
    result = await db.execute(query)
    repos = result.scalars().all()
    
    if not repos:
        raise HTTPException(status_code=400, detail="未配置Git仓库")
    
    target_repo = repos[0]

    project_path = storage_service.get_secure_path(project.storage_key)
    
    success, msg = await git_service.pull(
        project_path=project_path,
        repo_url=target_repo.repo_url,
        branch=target_repo.branch or "main",
        username=target_repo.username,
        token=target_repo.token,
        force=force
    )

    if not success:
        raise HTTPException(status_code=500, detail=f"Git Pull失败: {msg}")

    # 记录日志
    await log_service.log_project_operation(
        db=db,
        operation_type=OperationType.GIT_PULL,
        project_id=project_id,
        user=current_user,
        detail={"repo": target_repo.repo_url, "branch": target_repo.branch, "repo_alias": target_repo.name, "force": force},
        request=request,
    )

    # 发送通知给其他成员
    await notification_service.notify_project_members(
        db=db,
        project_id=project_id,
        exclude_user_id=current_user.id,
        title=f"项目文档已通过 Git 同步",
        content=f"{current_user.nickname or current_user.username} 执行了 Git Pull，项目 [{project.name}] 的内容已从远程仓库同步更新。",
        link=f"/projects/{project_id}/docs",
        category="project"
    )
    await db.commit()

    return success_response(message=f"Git Pull 成功 ({target_repo.name})")


@router.post("/{project_id}/git/push", response_model=dict)
async def git_push(
    project_id: int,
    request: Request,
    repo_id: int = None,
    force: bool = False,
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db)
):
    """执行 Git Push"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 权限检查：需要是所有者或管理员/编辑者
    if project.owner_id != current_user.id:
        member_result = await db.execute(
            select(ProjectMember).where(
                ProjectMember.project_id == project_id,
                ProjectMember.user_id == current_user.id,
                ProjectMember.role.in_(['admin', 'editor'])
            )
        )
        if not member_result.scalar_one_or_none():
            raise HTTPException(status_code=403, detail="无权执行Git操作")

    # 获取Git仓库配置
    query = select(ProjectGitRepo).where(ProjectGitRepo.project_id == project_id)
    if repo_id:
        query = query.where(ProjectGitRepo.id == repo_id)
    else:
        # 优先使用默认仓库
        query = query.order_by(ProjectGitRepo.is_default.desc(), ProjectGitRepo.created_at.desc())
    
    result = await db.execute(query)
    repos = result.scalars().all()
    
    if not repos:
        raise HTTPException(status_code=400, detail="未配置Git仓库")
    
    target_repo = repos[0]

    project_path = storage_service.get_secure_path(project.storage_key)
    
    success, msg = await git_service.push(
        project_path=project_path,
        repo_url=target_repo.repo_url,
        branch=target_repo.branch or "main",
        username=target_repo.username,
        token=target_repo.token,
        force=force
    )

    if not success:
        raise HTTPException(status_code=500, detail=f"Git Push失败: {msg}")

    # 记录日志
    await log_service.log_project_operation(
        db=db,
        operation_type=OperationType.GIT_PUSH,
        project_id=project_id,
        user=current_user,
        detail={"repo": target_repo.repo_url, "branch": target_repo.branch, "repo_alias": target_repo.name, "force": force},
        request=request,
    )

    return success_response(message=f"Git Push 成功 ({target_repo.name})")