const namingStore = require("../../store/namingStore");
const messages = require("../../constants/messages");
const { validateSurname, generateName } = require("../../services/namingService");
const { showRewardedVideoAd } = require("../../utils/adService");
const config = require("../../config/index");

const LOADING_MESSAGES = [
  "AI 正在推演八字，请稍候...",
  "结合天干地支，为您筛选契合佳名...",
  "耐心等待，吉名正在汇聚灵感..."
];

function showToast(title) {
  if (typeof tt === "undefined" || !tt.showToast) {
    console.warn("Toast:", title);
    return;
  }
  tt.showToast({
    title,
    icon: "none",
    duration: 2000
  });
}

Page({
  data: {
    surname: "",
    surnameError: "",
    gender: "male",
    birthDate: "",
    birthTime: "",
    nameLength: "double",
    isSubmitting: false,
    quotaRemaining: null,
    isLoading: false,
    loadingMessage: ""
  },
  onLoad() {
    const { form, quota } = namingStore.getState();
    this.setData({
      surname: form.surname,
      gender: form.gender,
      birthDate: form.birthDate,
      birthTime: form.birthTime,
      nameLength: form.nameLength,
      quotaRemaining: config.maxDailyQuota - quota.count
    });
  },
  handleSurnameInput(event) {
    const value = (event.detail.value || "").trim();
    this.setData({
      surname: value,
      surnameError: ""
    });
    namingStore.setForm({ surname: value });
  },
  handleSurnameBlur() {
    const surname = this.data.surname;
    if (!surname) {
      return;
    }
    validateSurname(surname)
      .then((response) => {
        const isValid = response ? response.isValid !== false : true;
        const message = response && response.message ? response.message : messages.INVALID_SURNAME;
        if (!isValid) {
          showToast(message);
          this.setData({
            surname: "",
            surnameError: message
          });
          namingStore.setForm({ surname: "" });
        } else {
          this.setData({ surnameError: "" });
        }
      })
      .catch(() => {
        showToast(messages.INVALID_SURNAME);
        this.setData({
          surname: "",
          surnameError: messages.INVALID_SURNAME
        });
        namingStore.setForm({ surname: "" });
      });
  },
  handleGenderChange(event) {
    const value = event.detail.value;
    this.setData({ gender: value });
    namingStore.setForm({ gender: value });
  },
  handleBirthDateChange(event) {
    const value = event.detail.value;
    this.setData({ birthDate: value });
    namingStore.setForm({ birthDate: value });
  },
  handleBirthTimeChange(event) {
    const value = event.detail.value;
    this.setData({ birthTime: value });
    namingStore.setForm({ birthTime: value });
  },
  handleNameLengthChange(event) {
    const value = event.detail.value;
    this.setData({ nameLength: value });
    namingStore.setForm({ nameLength: value });
  },
  handleGoFavorites() {
    if (typeof tt !== "undefined" && tt.navigateTo) {
      tt.navigateTo({ url: "/pages/favorites/index" });
    }
  },
  validateForm() {
    const { surname, gender, birthDate, nameLength } = this.data;
    if (!surname || !gender || !birthDate || !nameLength) {
      showToast(messages.FORM_INCOMPLETE);
      return false;
    }
    if (!namingStore.canGenerateToday()) {
      showToast(messages.QUOTA_EXCEEDED);
      return false;
    }
    return true;
  },
  updateQuotaState() {
    const { quota } = namingStore.getState();
    this.setData({
      quotaRemaining: Math.max(config.maxDailyQuota - quota.count, 0)
    });
  },
  handleGenerate() {
    if (this.data.isSubmitting) {
      return;
    }
    if (!this.validateForm()) {
      return;
    }
    this.setData({ isSubmitting: true });
    showRewardedVideoAd()
      .then(() => this.generateName())
      .catch((error) => {
        if (error && error.code === "ad_not_completed") {
          showToast(messages.WATCH_AD_TO_CONTINUE);
        } else {
          showToast("广告加载失败，请稍后重试");
        }
        this.hideLoadingOverlay();
        this.setData({ isSubmitting: false });
      });
  },
  generateName() {
    const payload = {
      surname: this.data.surname,
      gender: this.data.gender,
      birthDate: this.data.birthDate,
      birthTime: this.data.birthTime || "",
      nameLength: this.data.nameLength
    };
    this.showLoadingOverlay();
    return generateName(payload)
      .then((response) => {
        const results = response && Array.isArray(response.results) ? response.results : [];
        const analysis = response && response.analysis ? response.analysis : null;
        if (!results.length) {
          showToast(messages.GENERATION_FAILED);
          return;
        }
        const normalizedResults = results.reduce((accumulator, item) => {
          const name = item.name || item.Name || "";
          if (!name) {
            return accumulator;
          }
          accumulator.push({
            name,
            meaning: item.meaning || item.Meaning || "",
            elementReason: item.elementReason || item.ElementReason || ""
          });
          return accumulator;
        }, []);
        if (!normalizedResults.length) {
          showToast(messages.GENERATION_FAILED);
          return;
        }
        namingStore.setResults({
          results: normalizedResults,
          analysis
        });
        namingStore.incrementQuota();
        this.updateQuotaState();
        if (typeof tt !== "undefined" && tt.navigateTo) {
          tt.navigateTo({ url: "/pages/result/index" });
        }
      })
      .catch((error) => {
        const message = error && error.data && error.data.message;
        if (message === "CONTENT_RISK") {
          showToast(messages.CONTENT_RISK);
        } else if (message === "INVALID_SURNAME") {
          showToast(messages.INVALID_SURNAME);
        } else {
          showToast(messages.GENERATION_FAILED);
        }
      })
      .finally(() => {
        this.hideLoadingOverlay();
        this.setData({ isSubmitting: false });
      });
  },
  showLoadingOverlay() {
    const hint = LOADING_MESSAGES[Math.floor(Math.random() * LOADING_MESSAGES.length)];
    this.setData({
      isLoading: true,
      loadingMessage: hint
    });
  },
  hideLoadingOverlay() {
    if (!this.data.isLoading) {
      return;
    }
    this.setData({
      isLoading: false,
      loadingMessage: ""
    });
  }
});