from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy.orm import Session
from sqlalchemy import func as sa_func
from typing import List, Optional

from ..database import get_db
from ..models import TaskConfig, TaskLog
from ..schemas import TaskConfigBase, TaskConfigUpdate, TaskConfigResponse, TaskLogResponse
from .auth import get_current_admin

router = APIRouter(prefix="/api/admin/task-configs", tags=["admin"])

DEFAULT_CONFIGS = {
    "scheduled_fetch_trends": {"name": "🔥 热点趋势", "cron": "01:10", "params": {"llm_provider": "nvidia"}},
    "scheduled_collect": {"name": "📡 内容采集", "cron": "01:30", "params": {"max_topics": 20, "llm_provider": "nvidia"}},
    "scheduled_generate": {"name": "🤖 内容创作", "cron": "02:00", "params": {"auto_review": True, "llm_provider": "nvidia"}},
    "scheduled_optimize": {"name": "🔍 合规审查", "cron": "03:00", "params": {"auto_pass_threshold": 80, "llm_provider": "sensenova"}},
    "scheduled_optimize_sources": {"name": "📡 信息源优化", "cron": "05:00", "params": {"llm_provider": "nvidia"}},
    "scheduled_metrics_sync": {"name": "📊 指标同步", "cron": "06:00", "params": {"llm_provider": "nvidia"}},
    "scheduled_task_monitor": {"name": "⏰ 任务监控", "cron": "*", "params": {"llm_provider": "nvidia"}},
}

def _attach_last_log(resp: TaskConfigResponse, db: Session, module_id: str) -> TaskConfigResponse:
    """从最近一次 TaskLog 中附加 last_run_at 和 result_data"""
    last_log = db.query(TaskLog).filter(
        TaskLog.module_id == module_id, TaskLog.status.in_(["success", "failed"])
    ).order_by(TaskLog.started_at.desc()).first()
    if last_log:
        resp.last_run_at = last_log.started_at
        resp.result_data = last_log.result_data or {}
    return resp

@router.get("", response_model=List[TaskConfigResponse])
def list_configs(db: Session = Depends(get_db), admin_user=Depends(get_current_admin)):
    configs = db.query(TaskConfig).order_by(TaskConfig.id).all()
    if not configs:
        _ensure_defaults(db)
        configs = db.query(TaskConfig).order_by(TaskConfig.id).all()
    # 批量查询各模块最近一次运行记录
    latest_ids = db.query(
        sa_func.max(TaskLog.id).label('max_id')
    ).filter(
        TaskLog.status.in_(["success", "failed"])
    ).group_by(TaskLog.module_id).subquery()
    latest_logs = db.query(TaskLog).filter(
        TaskLog.id.in_(db.query(latest_ids.c.max_id))
    ).all()
    log_by_module = {log.module_id: log for log in latest_logs}
    result = []
    for cfg in configs:
        resp = TaskConfigResponse.model_validate(cfg)
        log = log_by_module.get(cfg.module_id)
        if log:
            resp.last_run_at = log.started_at
            resp.result_data = log.result_data or {}
        result.append(resp)
    return result

@router.get("/{module_id}", response_model=TaskConfigResponse)
def get_config(module_id: str, db: Session = Depends(get_db), admin_user=Depends(get_current_admin)):
    cfg = db.query(TaskConfig).filter(TaskConfig.module_id == module_id).first()
    if not cfg:
        _ensure_defaults(db)
        cfg = db.query(TaskConfig).filter(TaskConfig.module_id == module_id).first()
    if not cfg:
        default = DEFAULT_CONFIGS.get(module_id, {})
        cfg = TaskConfig(module_id=module_id, enabled=True, params=default.get("params", {}), schedule=default.get("cron", ""))
        db.add(cfg)
        db.commit()
        db.refresh(cfg)
    resp = TaskConfigResponse.model_validate(cfg)
    return _attach_last_log(resp, db, module_id)

@router.put("/{module_id}", response_model=TaskConfigResponse)
def update_config(module_id: str, data: TaskConfigUpdate, db: Session = Depends(get_db), admin_user=Depends(get_current_admin)):
    cfg = db.query(TaskConfig).filter(TaskConfig.module_id == module_id).first()
    if not cfg:
        _ensure_defaults(db)
        cfg = db.query(TaskConfig).filter(TaskConfig.module_id == module_id).first()
    if data.enabled is not None:
        cfg.enabled = data.enabled
    if data.params is not None:
        cfg.params = data.params
    if data.schedule is not None:
        cfg.schedule = data.schedule
    if data.last_modified_by:
        cfg.last_modified_by = data.last_modified_by
    db.commit()
    db.refresh(cfg)
    return cfg

@router.get("/history/{module_id}", response_model=List[TaskLogResponse])
def get_module_history(module_id: str, db: Session = Depends(get_db), admin_user=Depends(get_current_admin), limit: int = 20):
    logs = db.query(TaskLog).filter(TaskLog.module_id == module_id).order_by(TaskLog.started_at.desc()).limit(limit).all()
    return [TaskLogResponse.model_validate(l) for l in logs]

def _ensure_defaults(db: Session):
    existing = {c.module_id for c in db.query(TaskConfig).all()}
    for mid, info in DEFAULT_CONFIGS.items():
        if mid not in existing:
            db.add(TaskConfig(module_id=mid, enabled=True, params=info.get("params", {}), schedule=info.get("cron", "")))
    db.commit()