"use server";

import { and, eq } from "drizzle-orm";
import { revalidatePath } from "next/cache";
import { db } from "@/db";
import { photos, taskInstances } from "@/db/schema";
import { todayStr } from "@/lib/dates";
import { photoKey, uploadUrl } from "@/lib/oss";
import { getSessionUser } from "@/lib/auth";
import { awardPoints } from "@/lib/points";

// 取当前孩子会话,非法则抛错(客户端会显示)
async function requireChild() {
  const user = await getSessionUser();
  if (!user || user.role !== "child") throw new Error("会话无效,请重新激活设备");
  return user;
}

async function ownedTask(childId: number, instanceId: number) {
  const [task] = await db
    .select()
    .from(taskInstances)
    .where(and(eq(taskInstances.id, instanceId), eq(taskInstances.childUserId, childId)))
    .limit(1);
  if (!task) throw new Error("任务不存在");
  return task;
}

// 勾选 / 取消勾选(仅限今天;需凭证的任务必须有照片才能勾);首次勾选发积分
export async function toggleTask(instanceId: number, done: boolean): Promise<{ pointsEarned: number }> {
  const child = await requireChild();
  const task = await ownedTask(child.id, instanceId);
  if (task.date !== todayStr()) throw new Error("只能给今天的任务打卡");

  if (done && task.requiresPhoto) {
    const [photo] = await db
      .select({ id: photos.id })
      .from(photos)
      .where(eq(photos.taskInstanceId, instanceId))
      .limit(1);
    if (!photo) throw new Error("这个任务要先拍照凭证哦");
  }

  await db
    .update(taskInstances)
    .set({ status: done ? "done" : "pending", doneAt: done ? new Date() : null })
    .where(eq(taskInstances.id, instanceId));

  // xuchao: 首次完成才发分(唯一键防刷),分值取任务快照上的设置
  const pointsEarned = done
    ? await awardPoints(child.id, "checkin", `inst-${instanceId}`, task.points, task.title)
    : 0;

  revalidatePath("/kid");
  revalidatePath("/points");
  return { pointsEarned };
}

// 签发照片直传地址(浏览器 PUT 到对象存储)
export async function getUploadUrl(instanceId: number) {
  const child = await requireChild();
  const task = await ownedTask(child.id, instanceId);
  const count = await db
    .select({ id: photos.id })
    .from(photos)
    .where(eq(photos.taskInstanceId, instanceId));
  if (count.length >= 3) throw new Error("最多上传 3 张照片");

  const key = photoKey(child.id, task.date);
  return { url: uploadUrl(key, "image/jpeg"), key };
}

// 直传完成后登记照片
export async function confirmPhoto(instanceId: number, key: string) {
  const child = await requireChild();
  await ownedTask(child.id, instanceId);
  if (!key.startsWith(`photos/${child.id}/`)) throw new Error("照片路径非法");
  await db.insert(photos).values({ taskInstanceId: instanceId, ossKey: key });
  revalidatePath("/kid");
}