"""工作负载 API。"""

from __future__ import annotations

from typing import Optional

from fastapi import APIRouter, Depends, HTTPException, Query
from pydantic import BaseModel, Field
from sqlalchemy.ext.asyncio import AsyncSession

from ..core.database import get_db
from ..dependencies import (
    get_current_user,
    get_tenant_id,
    require_manager_user,
    require_roles,
    require_self_or_manager,
)
from ..models import User
from ..services import workload as workload_service

router = APIRouter(prefix="/workloads", tags=["workloads"])


class WorkloadHoursUpdateRequest(BaseModel):
    max_weekly_hours: float = Field(..., gt=0, le=120)


class AIOptimizePreviewRequest(BaseModel):
    project_id: Optional[int] = None
    max_moves: int = Field(default=20, ge=1, le=100)


class AIOptimizeApplyRequest(BaseModel):
    proposals: list[dict]

@router.get("/")
async def get_team_workloads(
    project_id: Optional[int] = Query(None),
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_roles("BOSS", "ADMIN")),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user
    rows = await workload_service.get_team_workload_board(
        db,
        tenant_id=tenant_id,
        project_id=project_id,
    )
    total = len(rows)
    avg_ratio = round(sum(float(r.get("workload_ratio", 0)) for r in rows) / total, 2) if total else 0.0
    overloaded = sum(1 for r in rows if float(r.get("workload_ratio", 0)) > 100)
    idle = sum(1 for r in rows if float(r.get("workload_ratio", 0)) < 70)

    return {
        "items": rows,
        "total": total,
        "summary": {
            "avg_ratio": avg_ratio,
            "overloaded_count": overloaded,
            "idle_count": idle,
            "normal_count": max(0, total - overloaded - idle),
        },
    }


@router.get("/summary")
async def get_workload_summary(
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user
    rows = await workload_service.get_team_workload_board(db, tenant_id=tenant_id)
    total = len(rows)
    avg_ratio = round(sum(float(r.get("workload_ratio", 0)) for r in rows) / total, 2) if total else 0.0
    return {
        "team_size": total,
        "avg_ratio": avg_ratio,
        "overloaded_count": sum(1 for r in rows if float(r.get("workload_ratio", 0)) > 100),
        "normal_count": sum(
            1
            for r in rows
            if 70 <= float(r.get("workload_ratio", 0)) <= 100
        ),
        "idle_count": sum(1 for r in rows if float(r.get("workload_ratio", 0)) < 70),
    }


@router.get("/{user_id}")
async def get_user_workload(
    user_id: int,
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_self_or_manager),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user

    item = await workload_service.get_user_personal_workload(db, tenant_id, user_id)
    if not item:
        raise HTTPException(status_code=404, detail="User workload not found")
    return item


@router.put("/{user_id}")
async def update_weekly_hours(
    user_id: int,
    body: WorkloadHoursUpdateRequest,
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_self_or_manager),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user

    result = await workload_service.update_user_max_weekly_hours(
        db,
        tenant_id=tenant_id,
        user_id=user_id,
        max_weekly_hours=body.max_weekly_hours,
    )
    if not result:
        raise HTTPException(status_code=404, detail="User not found")
    return result


@router.get("/{user_id}/tasks")
async def get_user_workload_tasks(
    user_id: int,
    status_value: Optional[str] = Query(None, alias="status"),
    priority: Optional[str] = Query(None),
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_self_or_manager),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user

    items = await workload_service.list_user_assigned_tasks(
        db,
        tenant_id=tenant_id,
        user_id=user_id,
        status=status_value,
        priority=priority,
    )
    return {"items": items, "total": len(items)}


@router.get("/{user_id}/trend")
async def get_user_workload_trend(
    user_id: int,
    days: int = Query(7, ge=1, le=30),
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_self_or_manager),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user

    items = await workload_service.get_user_workload_trend(
        db,
        tenant_id=tenant_id,
        user_id=user_id,
        days=days,
    )
    return {"items": items, "total": len(items)}


@router.post("/ai-optimize")
async def ai_optimize_preview(
    body: AIOptimizePreviewRequest,
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_manager_user),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user
    proposals = await workload_service.build_ai_optimize_preview(
        db,
        tenant_id=tenant_id,
        project_id=body.project_id,
        max_moves=body.max_moves,
    )
    return {"proposals": proposals, "total": len(proposals)}


@router.post("/ai-optimize/apply")
async def apply_ai_optimize(
    body: AIOptimizeApplyRequest,
    tenant_id: int = Depends(get_tenant_id),
    current_user: User = Depends(require_manager_user),
    db: AsyncSession = Depends(get_db),
):
    _ = current_user
    result = await workload_service.apply_ai_optimize_plan(
        db,
        tenant_id=tenant_id,
        proposals=body.proposals,
    )
    return result