import cloud from '@lafjs/cloud'
import {
  buildClaimId,
  getActiveSignInConfig,
  getChinaDateKey,
  getChinaDayStart,
  getSignInClaims,
  normalizeSignInState,
} from "@/SignInActivity";

const db = cloud.database();
const USERS_COLLECTION = "users";
const CLAIM_COLLECTION = "sign_in_activity_claims";
const DAY_MS = 24 * 60 * 60 * 1000;

export default async function (ctx: FunctionContext) {
  const adminToken = ctx.body?.adminToken || ctx.query?.adminToken;
  if (!checkAdminToken(adminToken)) {
    return { code: 0, data: null, msg: "测试接口未启用或管理密钥错误" };
  }

  const action = String(ctx.body?.action || ctx.query?.action || "inspect");
  const uid = ctx.body?.uid || ctx.query?.uid;
  if (!uid) {
    return { code: 0, data: null, msg: "未获取到uid" };
  }
  const userResult = await db.collection(USERS_COLLECTION).where({ _id: uid }).getOne();
  const user = userResult.data;
  if (!user) {
    return { code: 0, data: null, msg: "未获取到用户信息" };
  }

  switch (action) {
    case "inspect":
      return await inspectUser(user);
    case "reset":
      await clearClaims(uid);
      await updateUser(uid, { signInActivity: null });
      return await inspectUser({ ...user, signInActivity: null });
    case "set_level":
      return await setLevel(user, ctx.body?.levelAmount);
    case "prepare":
      return await prepareScenario(user, String(ctx.body?.scenario || ""));
    default:
      return { code: 0, data: null, msg: "无效action，请使用 inspect、reset、set_level 或 prepare" };
  }
}

function checkAdminToken(adminToken: string) {
  const env = (globalThis as any).process?.env || {};
  const expected = String(env.SIGN_IN_TEST_ADMIN_TOKEN || "");
  return !!expected && !!adminToken && adminToken === expected;
}

async function setLevel(user: any, rawLevel: any) {
  const levelAmount = Number(rawLevel);
  if (!Number.isInteger(levelAmount) || levelAmount < 0) {
    return { code: 0, data: null, msg: "levelAmount必须是大于等于0的整数" };
  }
  await updateUser(user._id, { levelAmount });
  return await inspectUser({ ...user, levelAmount });
}

async function prepareScenario(user: any, scenario: string) {
  const config = await getActiveSignInConfig();
  if (!config) {
    return { code: 0, data: null, msg: "签到活动配置不存在或配置无效" };
  }
  const now = Date.now();
  const triggerLevel = Number(config.triggerLevel);

  if (scenario === "locked" || scenario === "eligible") {
    const levelAmount = scenario === "locked" ? Math.max(0, triggerLevel - 1) : triggerLevel;
    await clearClaims(user._id);
    await updateUser(user._id, { levelAmount, signInActivity: null });
    return await inspectUser({ ...user, levelAmount, signInActivity: null }, scenario);
  }

  const dayReadyMatch = /^day_([1-7])_ready$/.exec(scenario);
  if (dayReadyMatch) {
    const claimedCount = Number(dayReadyMatch[1]) - 1;
    return await prepareActivity(user, config, now, scenario, claimedCount, false, false);
  }
  if (scenario === "claimed_today") {
    return await prepareActivity(user, config, now, scenario, 1, true, false);
  }
  if (scenario === "expired") {
    return await prepareActivity(user, config, now, scenario, 0, false, true);
  }
  if (scenario === "completed") {
    return await prepareActivity(user, config, now, scenario, 7, false, false, true);
  }
  return {
    code: 0,
    data: null,
    msg: "无效scenario，请使用 locked、eligible、day_1_ready至day_7_ready、claimed_today、expired或completed",
  };
}

async function prepareActivity(
  user: any,
  config: any,
  now: number,
  scenario: string,
  claimedCount: number,
  todayClaimed: boolean,
  expired: boolean,
  completed = false,
) {
  await clearClaims(user._id);
  const todayStart = getChinaDayStart(now);
  const startAt = expired
    ? todayStart - Number(config.durationDays) * DAY_MS
    : todayStart - Math.min(claimedCount, 7) * DAY_MS;
  const endAt = expired
    ? todayStart
    : startAt + Number(config.durationDays) * DAY_MS;
  const signInActivity = {
    activityId: config.activityId,
    startAt,
    endAt,
    activatedAt: startAt,
    completedAt: completed ? now : null,
  };
  await updateUser(user._id, {
    levelAmount: Number(config.triggerLevel),
    signInActivity: JSON.stringify(signInActivity),
  });

  for (let index = 0; index < claimedCount; index++) {
    const rewardDay = index + 1;
    const daysAgo = todayClaimed && index === claimedCount - 1
      ? 0
      : claimedCount - index;
    const claimedAt = now - daysAgo * DAY_MS;
    const dateKey = getChinaDateKey(claimedAt);
    const claimId = buildClaimId(user._id, config.activityId, dateKey);
    await db.collection(CLAIM_COLLECTION).add({
      _id: claimId,
      claimId,
      uid: user._id,
      activityId: config.activityId,
      dateKey,
      rewardDay,
      rewards: config.rewards[index].items,
      claimedAt,
      testPrepared: true,
    });
  }
  return await inspectUser({
    ...user,
    levelAmount: Number(config.triggerLevel),
    signInActivity,
  }, scenario);
}

async function inspectUser(user: any, scenario?: string) {
  const state = normalizeSignInState(user.signInActivity);
  const claims = state ? await getSignInClaims(user._id, state.activityId) : [];
  return {
    code: 1,
    data: {
      scenario: scenario || null,
      uid: user._id,
      levelAmount: Number(user.levelAmount) || 0,
      signInActivity: state,
      claimedCount: claims.length,
      claims,
    },
    msg: "测试状态准备成功",
  };
}

async function clearClaims(uid: string) {
  await db.collection(CLAIM_COLLECTION).where({ uid }).remove({ multi: true });
}

async function updateUser(uid: string, data: any) {
  await db.collection(USERS_COLLECTION).where({ _id: uid }).update(data);
}