import json
from datetime import datetime

from fastapi import APIRouter, Depends, HTTPException

from app.core.security import require_permission
from app.repositories import policy_repository
from app.schemas.policy import PolicySaveRequest
from app.services.common_service import policy_row_to_dict, validate_channel_code


router = APIRouter(tags=["admin-policy"])


@router.get("/admin/policy")
def admin_get_policy(app_id: str, channel: str, auth=Depends(require_permission("policy:view"))):
    row = policy_repository.get_policy(app_id, channel)
    result = policy_row_to_dict(row)
    result.update({"app_id": app_id, "channel": channel, "saved": bool(row)})
    return result


@router.post("/admin/policy/save")
def admin_save_policy(body: PolicySaveRequest, auth=Depends(require_permission("policy:manage"))):
    app_id = body.app_id.strip()
    channel = body.channel.strip()
    if not app_id or not validate_channel_code(channel):
        raise HTTPException(status_code=400, detail="App ID 或渠道无效")
    disabled = body.disabled_versions or []
    if any(not isinstance(v, str) for v in disabled):
        raise HTTPException(status_code=400, detail="disabled_versions 必须是版本字符串数组")
    valid_until = body.valid_until.strip()
    try:
        datetime.fromisoformat(valid_until.replace("Z", "+00:00"))
    except ValueError:
        raise HTTPException(status_code=400, detail="valid_until 必须是 ISO-8601 时间")
    result, next_seq = policy_repository.save_policy(
        app_id,
        channel,
        bool(body.force_update),
        bool(body.allow_rollback),
        bool(body.offline_allowed),
        valid_until,
        body.min_supported_version.strip(),
        json.dumps(disabled, ensure_ascii=False),
        body.message.strip(),
    )
    if result == "channel_not_found":
        raise HTTPException(status_code=400, detail={"error": "channel_not_found", "msg": f"渠道 {channel} 不存在"})
    if result == "channel_disabled":
        raise HTTPException(status_code=403, detail={"error": "channel_disabled", "msg": f"渠道 {channel} 已停用"})
    return {"msg": "策略已保存并递增 policy_seq", "policy_seq": next_seq}