# -*- coding: utf-8 -*-
# @Time    : 2024/11/19 下午8:05
# @FileName: manage_project.py
# @Software: PyCharm
from datetime import datetime
from typing import re

from fastapi import APIRouter
from sqlalchemy import delete

from dependencies import *
from models import Project, ProjectUserLink

router = APIRouter()
TenantRole = 1


# 列举所有项目
@router.get("/api/s1/project")
async def get_project(response: Response, session: SessionDep, current_user: User = Depends(get_current_user)):
    # 只有角色为 0、1、2 或 3 的用户才可以访问
    if current_user.role == 0:
        # 角色为0，显示所有项目
        projects = session.query(Project).all()
    elif current_user.role == 1:
        # 角色为1，显示tenant_id匹配的项目（即属于当前租户的项目）
        projects = session.query(Project).filter(Project.owner_id == current_user.tenant_id).all()
    elif current_user.role in [2, 3]:
        # 角色为2或3，显示与当前用户相关联的项目
        projects = (
            session.query(Project)
            .join(ProjectUserLink)
            .filter(ProjectUserLink.user_id == current_user.id)
            .all()
        )
    else:
        raise HTTPException(status_code=403, detail="You do not have permission to view projects.")

    if not projects:
        raise HTTPException(status_code=404, detail="Project not found or you have no projects.")

    # 返回项目的基本信息
    return {
        "projects": [
            {
                "name": project.name,
                "requirement": project.requirement,
                "start_time": project.start_time,
                "deadline": project.deadline
            }
            for project in projects
        ]
    }


# 新增与修改项目
@router.post("/api/s1/project")
async def create_project(data: dict, session: SessionDep, current_user: User = Depends(get_current_user)):
    if current_user.role != 1:
        raise HTTPException(status_code=403, detail="Only Tenant admin users can add or update projects.")

    project_id = data.get("project_id")
    name = data.get("name")
    requirement = data.get("requirement")
    start_time_str = data.get("start_time")
    deadline_str = data.get("deadline")
    estimators = data.get("estimator")
    auditors = data.get("auditor")

    # 验证是否缺少必要参数
    if not name or not requirement or not start_time_str or not deadline_str:
        raise HTTPException(status_code=400, detail="Need more details")

    # 验证开始时间是否早于结束时间
    # 去掉 'Z' 和毫秒部分
    start_time_str = start_time_str.split('.')[0].rstrip('Z')
    deadline_str = deadline_str.split('.')[0].rstrip('Z')

    start_time = datetime.strptime(start_time_str, "%Y-%m-%dT%H:%M:%S")
    deadline = datetime.strptime(deadline_str, "%Y-%m-%dT%H:%M:%S")

    if start_time > deadline:
        raise HTTPException(status_code=400, detail="Start time must be before deadline")

    # 验证是否有传入评估/审核员
    if not estimators or not auditors:
        raise HTTPException(status_code=400, detail="Need more estimators or auditors")
    # 验证评估审核员是否存在
    query_estimators = select(User).where(User.username.in_(estimators))
    users_estimators = session.exec(query_estimators).all()
    query_auditors = select(User).where(User.username.in_(auditors))
    users_auditors = session.exec(query_auditors).all()
    # 提取出所有查询到的
    existing_estimators = {user.username for user in users_estimators}
    existing_auditors = {user.username for user in users_auditors}

    # 验证是否所有的username都存在于数据库中
    missing_usernames = (set(auditors) | set(estimators)) - existing_estimators - existing_auditors

    if missing_usernames:
        raise HTTPException(status_code=404, detail=f"Missing usernames:{missing_usernames}")

    # 更新项目还是新增项目
    if project_id:
        # 查找现有项目
        project = session.get(Project, project_id)
        if not project:
            raise HTTPException(status_code=404, detail="Project not found")

        # 更新项目内容
        project.name = name
        project.requirement = requirement
        project.start_time = start_time
        project.deadline = deadline
    else:
        # 新增项目
        exist_project = session.exec(select(Project).where(Project.name == name)).first()
        if exist_project:
            raise HTTPException(status_code=404, detail="Project already exists")

        project = Project(
            name=name,
            requirement=requirement,
            start_time=start_time,
            deadline=deadline,
            owner_id=current_user.tenant_id,
        )
        session.add(project)

    # 处理项目和用户的关联
    # 先清除现有的关联
    # 生成删除语句并执行
    stmt = delete(ProjectUserLink).where(ProjectUserLink.project_id == project.id)
    session.execute(stmt)
    session.commit()  # 提交事务

    # 重新建立与评估员和审核员的关系
    for username in estimators:
        user = next((user for user in users_estimators if user.username == username), None)
        if user:
            project_user_link = ProjectUserLink(project_id=project.id, user_id=user.id)
            session.add(project_user_link)

    for username in auditors:
        user = next((user for user in users_auditors if user.username == username), None)
        if user:
            project_user_link = ProjectUserLink(project_id=project.id, user_id=user.id)
            session.add(project_user_link)

    # 提交事务
    session.commit()
    session.refresh(project)

    return {"message": "Added or updated successfully",
            "information": project,
            }


# 删除项目
@router.delete("/api/s1/project")
async def delete_project(data: dict, session: SessionDep, current_user: User = Depends(get_current_user)):
    if current_user.role != 1:
        raise HTTPException(status_code=403, detail="Only Tenant admin users can delete projects.")

    project_name = data.get("name")

    if not project_name:
        raise HTTPException(status_code=400, detail="Project name is required")

    # 查找项目
    project = session.exec(
        select(Project).where(Project.name == project_name)).first()

    if not project:
        raise HTTPException(status_code=404, detail="Project not found")

    # 删除与项目相关的用户链接
    # 先清除现有的关联
    stmt = delete(ProjectUserLink).where(ProjectUserLink.project_id == project.id)
    session.execute(stmt)

    # 删除项目
    session.delete(project)
    session.commit()

    return {"detail": "Project deleted successfully"}