import cloud from "@lafjs/cloud";
import Utils from "@/Utils";
import {
  WUCAI_TYPE_AUTO_MIGRATED,
  WUCAI_TYPE_CHOSE_CURRENT,
  WUCAI_TYPE_CHOSE_WUCAI,
  WUCAI_TYPE_PENDING_CHOICE,
  addWucaiReward,
  fetchWucaiUser,
  hasWucaiRewardGranted,
  isValidWucaiType,
  normalizeWucaiUser,
  wucaiMatch,
  wucaiState,
} from "./wucaiMigration";

const db = cloud.database();

export default async function wucaiTransfer(ctx: FunctionContext) {
  const body = ctx.body || {};
  const uid = body.uid;
  const action = String(body.action || "");

  if (body.gameName === "iaa") {
    return fail("WUCAI_UNSUPPORTED_GAME", "五彩账号迁移仅支持主用户库");
  }
  if (!uid) {
    return fail("WUCAI_UID_REQUIRED", "未获取到uid");
  }
  if (!isSupportedAction(action)) {
    return fail("WUCAI_INVALID_ACTION", "无效的五彩迁移动作");
  }

  const userResult = await db.collection("users").where({ _id: uid }).getOne();
  const user = userResult.data;
  if (!user) {
    return fail("WUCAI_USER_NOT_FOUND", "未获取到玩家信息");
  }
  if (!user.token || !body.token || !Utils.checkToken(body.token, user.token)) {
    return fail("TOKEN_INVALID", "token校验失败");
  }
  if (!isValidWucaiType(user.wucai_type)) {
    return fail("WUCAI_INVALID_STATE", "五彩迁移状态异常");
  }

  const rewardGranted = hasWucaiRewardGranted(user);
  // A delayed claim response must not finish or reward a later selection round.
  if (action === "claim_reward" && rewardGranted) {
    return success(user, true);
  }
  if ((body.wucai_entry_id || "") !== (user.wucai_entry_id || "")) {
    return fail("WUCAI_STATE_CHANGED", "迁移轮次已经变化，请重新登录", wucaiState(user));
  }

  const expectedType = action === "claim_reward"
    ? WUCAI_TYPE_AUTO_MIGRATED
    : WUCAI_TYPE_PENDING_CHOICE;
  const nextType = action === "choose_current"
    ? WUCAI_TYPE_CHOSE_CURRENT
    : WUCAI_TYPE_CHOSE_WUCAI;
  const currentType = Number(user.wucai_type);

  if (action === "ack_reward_popup") {
    return acknowledgeRewardPopup(uid, currentType, user);
  }

  if (currentType === nextType) {
    return success(user, action === "claim_reward");
  }
  if (currentType !== expectedType) {
    return fail("WUCAI_INVALID_STATE", "当前状态不能执行该迁移动作", { wucai_type: currentType });
  }

  let update: any;
  if (action === "choose_wucai") {
    const source = await fetchWucaiUser(user.unionid);
    if (!source) {
      return fail("WUCAI_SOURCE_UNAVAILABLE", "五彩数据获取失败，请重新进入游戏后重试");
    }
    const migratedUser = normalizeWucaiUser(source);
    update = {
      ...migratedUser,
      monthCardReward: Math.max(migratedUser.monthCardReward, Number(user.monthCardReward) || 0),
      ...(!rewardGranted ? addWucaiReward(migratedUser) : {}),
    };
  } else {
    update = !rewardGranted ? addWucaiReward(user) : {};
  }
  Object.assign(update, {
    wucai_type: nextType,
    wucai_reward_granted: true,
    wucai_reward_popup_pending: user.wucai_reward_popup_pending === true
      || (!rewardGranted && action !== "claim_reward"),
    forcedUpdate: true,
  });

  const updateResult = await (cloud.mongo.db as any).collection("users").updateOne(
    wucaiMatch(user, Object.keys(update)), { $set: update },
  );
  if (!updateResult.matchedCount) {
    const latestResult = await db.collection("users").where({ _id: uid }).getOne();
    const latestType = Number(latestResult.data?.wucai_type);
    if (latestResult.data && (latestResult.data.wucai_entry_id || "") === (user.wucai_entry_id || "")
      && latestType === nextType) {
      return success(latestResult.data, action === "claim_reward");
    }
    return fail("WUCAI_STATE_CHANGED", "迁移状态已经变化，请重新登录", { wucai_type: latestType });
  }

  return success({ ...user, ...update }, action === "claim_reward");
}

function isSupportedAction(action: string): boolean {
  return action === "claim_reward"
    || action === "choose_wucai"
    || action === "choose_current"
    || action === "ack_reward_popup";
}

async function acknowledgeRewardPopup(uid: any, currentType: number, user: any) {
  if (currentType !== WUCAI_TYPE_CHOSE_WUCAI && currentType !== WUCAI_TYPE_CHOSE_CURRENT) {
    return fail("WUCAI_INVALID_STATE", "当前状态不能确认迁移奖励弹窗", { wucai_type: currentType });
  }
  if (user.wucai_reward_popup_pending !== true) {
    return popupAcknowledged(user);
  }

  const updateResult = await (cloud.mongo.db as any).collection("users").updateOne(
    wucaiMatch(user), { $set: { wucai_reward_popup_pending: false } },
  );
  if (!updateResult.matchedCount) {
    const latestResult = await db.collection("users").where({ _id: uid }).getOne();
    const latestType = Number(latestResult.data?.wucai_type);
    if (latestResult.data && (latestResult.data.wucai_entry_id || "") === (user.wucai_entry_id || "")
      && (latestType === WUCAI_TYPE_CHOSE_WUCAI || latestType === WUCAI_TYPE_CHOSE_CURRENT)
      && latestResult.data?.wucai_reward_popup_pending !== true) {
      return popupAcknowledged(latestResult.data);
    }
    return fail("WUCAI_STATE_CHANGED", "迁移奖励弹窗状态已经变化，请重新登录", {
      wucai_type: latestType,
    });
  }
  return popupAcknowledged({ ...user, wucai_reward_popup_pending: false });
}

function success(user: any, includeResources = false) {
  const rewardData = includeResources
    ? {
      coinAmount: Number(user.coinAmount),
      freezeAmount: Number(user.freezeAmount),
      hammerAmount: Number(user.hammerAmount),
      magicAmount: Number(user.magicAmount),
    }
    : {};
  return {
    code: 1,
    data: {
      ...wucaiState(user),
      forcedUpdate: true,
      ...rewardData,
    },
    msg: "五彩账号迁移处理成功",
  };
}

function popupAcknowledged(user: any) {
  return {
    code: 1,
    data: wucaiState(user),
    msg: "迁移奖励弹窗已确认",
  };
}

function fail(errorCode: string, msg: string, data: any = null) {
  return { code: 0, errorCode, data, msg };
}