"""首页聚合统计路由。"""

from fastapi import APIRouter, Depends
from sqlalchemy import func
from sqlalchemy.orm import Session

from ..database import get_db
from ..deps import get_current_user
from ..models import (
    Account,
    HuyaAccount,
    HuyaGoodsSnapshot,
    HuyaRechargeGoodsSnapshot,
    HuyaTask,
    LoginTask,
    User,
)
from ..permissions import user_has_permission


router = APIRouter(prefix="/api/dashboard", tags=["首页概览"])


def _task_summary(query, task_model) -> dict:
    """按状态汇总任务，避免首页读取任务列表。"""
    rows = (
        query.order_by(None)
        .with_entities(task_model.status, func.count(task_model.id))
        .group_by(task_model.status)
        .all()
    )
    status_counts = {status or "": count for status, count in rows}
    return {
        "total": sum(status_counts.values()),
        "success": status_counts.get("success", 0),
        "failed": sum(status_counts.get(status, 0) for status in ("failed", "error")),
        "status_counts": status_counts,
    }


def _empty_task_summary() -> dict:
    return {"total": 0, "success": 0, "failed": 0, "status_counts": {}}


def _can_view_huya_all(user: User) -> bool:
    """兼容旧 huya:account 全量权限。"""
    return user_has_permission(user, "huya:view_all") or user_has_permission(user, "huya:account")


@router.get("/summary")
def dashboard_summary(
    db: Session = Depends(get_db),
    current: User = Depends(get_current_user),
):
    """返回首页所需的全部轻量统计。"""
    douyu_accounts = 0
    if user_has_permission(current, "account:view_all"):
        douyu_accounts = db.query(Account).count()
    elif user_has_permission(current, "account:view_assigned"):
        douyu_accounts = db.query(Account).filter(Account.assigned_to == current.id).count()

    login_tasks = _empty_task_summary()
    if any(user_has_permission(current, permission) for permission in (
        "login:batch",
        "login:view_all",
        "login:view_assigned",
    )):
        login_query = db.query(LoginTask).join(Account, LoginTask.account_id == Account.id)
        if not user_has_permission(current, "login:view_all"):
            login_query = login_query.filter(Account.assigned_to == current.id)
        login_tasks = _task_summary(login_query, LoginTask)

    cookies = 0
    if user_has_permission(current, "cookie:view"):
        cookie_query = (
            db.query(LoginTask)
            .join(Account, LoginTask.account_id == Account.id)
            .filter(LoginTask.status == "success")
        )
        if not user_has_permission(current, "login:view_all"):
            cookie_query = cookie_query.filter(Account.assigned_to == current.id)
        cookies = cookie_query.count()

    huya_accounts = 0
    can_view_huya_accounts = any(user_has_permission(current, permission) for permission in (
        "huya:account",
        "huya:view_all",
        "huya:view_assigned",
    ))
    if can_view_huya_accounts:
        huya_account_query = db.query(HuyaAccount)
        if not _can_view_huya_all(current):
            huya_account_query = huya_account_query.filter(HuyaAccount.assigned_to == current.id)
        huya_accounts = huya_account_query.count()

    huya_tasks = _empty_task_summary()
    huya_goods = 0
    huya_recharge_goods = 0
    if user_has_permission(current, "huya:task"):
        huya_task_query = db.query(HuyaTask).join(HuyaAccount, HuyaTask.account_id == HuyaAccount.id)
        if not _can_view_huya_all(current):
            huya_task_query = huya_task_query.filter(HuyaAccount.assigned_to == current.id)
        huya_tasks = _task_summary(huya_task_query, HuyaTask)
        huya_goods = db.query(HuyaGoodsSnapshot).count()
        huya_recharge_goods = db.query(HuyaRechargeGoodsSnapshot).count()

    return {
        "douyu": {
            "accounts": douyu_accounts,
            "tasks": login_tasks["total"],
            "success": login_tasks["success"],
            "failed": login_tasks["failed"],
            "cookies": cookies,
        },
        "huya": {
            "accounts": huya_accounts,
            "tasks": huya_tasks["total"],
            "success": huya_tasks["success"],
            "failed": huya_tasks["failed"],
            "goods": huya_goods,
            "rechargeGoods": huya_recharge_goods,
        },
    }