"""项目管理路由"""
from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from sqlalchemy import func as sa_func
from typing import List, Optional
from datetime import datetime
from database import get_db
from models import (
    User, Project, Submission, ProjectType,
    ProjectStatus, PhaseGroup, WorkType,
    ProjectMilestone, DEFAULT_MILESTONES
)
from schemas import (
    ProjectCreate, ProjectUpdate, ProjectOut,
    MilestoneOut, MilestoneCreate
)
from auth import get_current_user, require_permission

router = APIRouter(prefix="/api/projects", tags=["项目管理"])


def enrich_project(p: Project, db: Session) -> ProjectOut:
    """将项目对象转为带计算字段的输出"""
    # 累计提交秒数（仅有秒数的提交）
    total_secs = db.query(sa_func.sum(Submission.total_seconds)).filter(
        Submission.project_id == p.id,
        Submission.total_seconds > 0
    ).scalar() or 0

    target = p.target_total_seconds
    progress = round(total_secs / target * 100, 1) if target > 0 else 0

    # 损耗 = 测试损耗 + 超产损耗（排除测试秒数避免双重计数）
    test_secs = db.query(sa_func.sum(Submission.total_seconds)).filter(
        Submission.project_id == p.id,
        Submission.work_type == WorkType.TEST
    ).scalar() or 0
    production_secs = total_secs - test_secs
    overproduction = max(0, production_secs - target)
    waste = test_secs + overproduction
    waste_rate = round(waste / target * 100, 1) if target > 0 else 0

    leader_name = p.leader.name if p.leader else None

    # 里程碑数据
    ms_rows = db.query(ProjectMilestone).filter(
        ProjectMilestone.project_id == p.id
    ).order_by(ProjectMilestone.phase, ProjectMilestone.sort_order).all()

    milestones_out = [
        MilestoneOut(
            id=m.id, name=m.name,
            phase=m.phase.value if hasattr(m.phase, 'value') else m.phase,
            is_completed=bool(m.is_completed),
            completed_at=m.completed_at,
            sort_order=m.sort_order,
        )
        for m in ms_rows
    ]

    # 阶段摘要
    pre_ms = [m for m in ms_rows if (m.phase.value if hasattr(m.phase, 'value') else m.phase) == "前期"]
    post_ms = [m for m in ms_rows if (m.phase.value if hasattr(m.phase, 'value') else m.phase) == "后期"]
    pre_completed = sum(1 for m in pre_ms if m.is_completed)
    post_completed = sum(1 for m in post_ms if m.is_completed)

    phase_summary = {
        "pre": {"total": len(pre_ms), "completed": pre_completed},
        "production": {
            "progress_percent": progress,
            "submitted_seconds": round(total_secs, 1),
            "target_seconds": target,
        },
        "post": {"total": len(post_ms), "completed": post_completed},
    }

    # 自动推断当前阶段
    if len(pre_ms) > 0 and pre_completed < len(pre_ms):
        current_stage = "前期"
    elif progress < 100:
        current_stage = "制作"
    elif len(post_ms) > 0 and post_completed < len(post_ms):
        current_stage = "后期"
    else:
        current_stage = "已完成"

    return ProjectOut(
        id=p.id, name=p.name,
        project_type=p.project_type.value if hasattr(p.project_type, 'value') else p.project_type,
        status=p.status.value if hasattr(p.status, 'value') else p.status,
        leader_id=p.leader_id, leader_name=leader_name,
        current_phase=p.current_phase.value if hasattr(p.current_phase, 'value') else p.current_phase,
        episode_duration_minutes=p.episode_duration_minutes,
        episode_count=p.episode_count,
        target_total_seconds=target,
        estimated_completion_date=p.estimated_completion_date,
        actual_completion_date=p.actual_completion_date,
        contract_amount=p.contract_amount,
        created_at=p.created_at,
        total_submitted_seconds=round(total_secs, 1),
        progress_percent=progress,
        waste_seconds=round(waste, 1),
        waste_rate=waste_rate,
        milestones=milestones_out,
        phase_summary=phase_summary,
        current_stage=current_stage,
    )


@router.get("/", response_model=List[ProjectOut])
def list_projects(
    status: Optional[str] = Query(None),
    project_type: Optional[str] = Query(None),
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    q = db.query(Project)
    if status:
        q = q.filter(Project.status == ProjectStatus(status))
    if project_type:
        q = q.filter(Project.project_type == ProjectType(project_type))
    projects = q.order_by(Project.created_at.desc()).all()
    return [enrich_project(p, db) for p in projects]


@router.post("/", response_model=ProjectOut)
def create_project(
    req: ProjectCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:create"))
):
    project = Project(
        name=req.name,
        project_type=ProjectType(req.project_type),
        leader_id=req.leader_id,
        current_phase=PhaseGroup(req.current_phase),
        episode_duration_minutes=req.episode_duration_minutes,
        episode_count=req.episode_count,
        estimated_completion_date=req.estimated_completion_date,
        contract_amount=req.contract_amount,
    )
    db.add(project)
    db.flush()

    # 创建里程碑
    ms_list = req.milestones if req.milestones else DEFAULT_MILESTONES
    for ms in ms_list:
        db.add(ProjectMilestone(
            project_id=project.id,
            name=ms["name"],
            phase=PhaseGroup(ms["phase"]),
            sort_order=ms.get("sort_order", 0),
        ))
    db.commit()
    db.refresh(project)
    return enrich_project(project, db)


@router.get("/{project_id}", response_model=ProjectOut)
def get_project(
    project_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    p = db.query(Project).filter(Project.id == project_id).first()
    if not p:
        raise HTTPException(status_code=404, detail="项目不存在")
    return enrich_project(p, db)


@router.put("/{project_id}", response_model=ProjectOut)
def update_project(
    project_id: int,
    req: ProjectUpdate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:edit"))
):
    p = db.query(Project).filter(Project.id == project_id).first()
    if not p:
        raise HTTPException(status_code=404, detail="项目不存在")
    if req.name is not None:
        p.name = req.name
    if req.project_type is not None:
        p.project_type = ProjectType(req.project_type)
    if req.status is not None:
        new_status = ProjectStatus(req.status)
        p.status = new_status
        if new_status in (ProjectStatus.IN_PROGRESS, ProjectStatus.ABANDONED):
            p.actual_completion_date = None
    if req.leader_id is not None:
        p.leader_id = req.leader_id
    if req.current_phase is not None:
        p.current_phase = PhaseGroup(req.current_phase)
    if req.episode_duration_minutes is not None:
        p.episode_duration_minutes = req.episode_duration_minutes
    if req.episode_count is not None:
        p.episode_count = req.episode_count
    if req.estimated_completion_date is not None:
        p.estimated_completion_date = req.estimated_completion_date
    if req.actual_completion_date is not None:
        p.actual_completion_date = req.actual_completion_date
    if req.contract_amount is not None:
        p.contract_amount = req.contract_amount
    db.commit()
    db.refresh(p)
    return enrich_project(p, db)


@router.delete("/{project_id}")
def delete_project(
    project_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:delete"))
):
    """删除项目及其关联数据"""
    from models import OutsourceCost, AIToolCostAllocation, CostOverride, SubmissionHistory
    p = db.query(Project).filter(Project.id == project_id).first()
    if not p:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 删除关联数据
    subs = db.query(Submission).filter(Submission.project_id == project_id).all()
    for s in subs:
        db.query(SubmissionHistory).filter(SubmissionHistory.submission_id == s.id).delete()
    db.query(Submission).filter(Submission.project_id == project_id).delete()
    db.query(OutsourceCost).filter(OutsourceCost.project_id == project_id).delete()
    db.query(AIToolCostAllocation).filter(AIToolCostAllocation.project_id == project_id).delete()
    db.query(CostOverride).filter(CostOverride.project_id == project_id).delete()
    db.query(ProjectMilestone).filter(ProjectMilestone.project_id == project_id).delete()
    db.delete(p)
    db.commit()
    return {"message": "项目已删除"}


@router.post("/{project_id}/complete")
def complete_project(
    project_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:complete"))
):
    """Owner 手动确认项目完成"""
    p = db.query(Project).filter(Project.id == project_id).first()
    if not p:
        raise HTTPException(status_code=404, detail="项目不存在")
    from datetime import date as date_today
    p.status = ProjectStatus.COMPLETED
    p.actual_completion_date = date_today.today()
    db.commit()
    return {"message": "项目已标记为完成", "project_id": project_id}


# ──────────────────── 里程碑管理 ────────────────────

@router.get("/{project_id}/milestones", response_model=List[MilestoneOut])
def list_milestones(
    project_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_user)
):
    ms = db.query(ProjectMilestone).filter(
        ProjectMilestone.project_id == project_id
    ).order_by(ProjectMilestone.phase, ProjectMilestone.sort_order).all()
    return [
        MilestoneOut(
            id=m.id, name=m.name,
            phase=m.phase.value if hasattr(m.phase, 'value') else m.phase,
            is_completed=bool(m.is_completed),
            completed_at=m.completed_at,
            sort_order=m.sort_order,
        )
        for m in ms
    ]


@router.post("/{project_id}/milestones", response_model=MilestoneOut)
def add_milestone(
    project_id: int,
    req: MilestoneCreate,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:edit"))
):
    p = db.query(Project).filter(Project.id == project_id).first()
    if not p:
        raise HTTPException(status_code=404, detail="项目不存在")
    # 找到同阶段最大 sort_order
    max_order = db.query(sa_func.max(ProjectMilestone.sort_order)).filter(
        ProjectMilestone.project_id == project_id,
        ProjectMilestone.phase == PhaseGroup(req.phase),
    ).scalar() or 0
    m = ProjectMilestone(
        project_id=project_id,
        name=req.name,
        phase=PhaseGroup(req.phase),
        sort_order=max_order + 1,
    )
    db.add(m)
    db.commit()
    db.refresh(m)
    return MilestoneOut(
        id=m.id, name=m.name,
        phase=m.phase.value, is_completed=False,
        completed_at=None, sort_order=m.sort_order,
    )


@router.put("/milestones/{milestone_id}/toggle")
def toggle_milestone(
    milestone_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:edit"))
):
    m = db.query(ProjectMilestone).filter(ProjectMilestone.id == milestone_id).first()
    if not m:
        raise HTTPException(status_code=404, detail="里程碑不存在")
    m.is_completed = 0 if m.is_completed else 1
    m.completed_at = datetime.now() if m.is_completed else None
    db.commit()
    return {"id": m.id, "is_completed": bool(m.is_completed)}


@router.delete("/milestones/{milestone_id}")
def delete_milestone(
    milestone_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(require_permission("project:edit"))
):
    m = db.query(ProjectMilestone).filter(ProjectMilestone.id == milestone_id).first()
    if not m:
        raise HTTPException(status_code=404, detail="里程碑不存在")
    db.delete(m)
    db.commit()
    return {"message": "已删除"}