const { requireLogin } = require("../../utils/auth");
const { del, get, post } = require("../../utils/api");
const { getEnabledModules, getActiveClassId, showError } = require("../../utils/page-helpers");
const { isModuleEnabled } = require("../../utils/modules");

function initialOf(name) {
  return String(name || "班").slice(0, 1);
}

function formatTime(value) {
  return String(value || "").replace("T", " ").slice(0, 16);
}

function sameId(left, right) {
  return Number(left) === Number(right);
}

function datasetBoolean(value) {
  return value === true || value === "true" || value === 1 || value === "1";
}

function normalizeTimeline(item, comments = [], currentUserId = null) {
  return {
    ...item,
    author_initial: initialOf(item.author_name),
    created_at_text: formatTime(item.created_at),
    like_action_text: item.has_liked ? "已赞" : "赞",
    like_action_class: item.has_liked ? "active" : "",
    comments: comments.map((comment) => ({
      ...comment,
      created_at_text: formatTime(comment.created_at),
      can_delete: sameId(currentUserId, comment.author_id)
    }))
  };
}

Page({
  data: {
    timelines: [],
    timelineEnabled: false,
    commentPostId: null,
    commentText: "",
    replyToName: "",
    commentPlaceholder: "写评论",
    commentInputFocus: false,
    keyboardOpen: false,
    loading: false,
    likingId: null,
    commenting: false
  },

  onShow() {
    if (!requireLogin()) return;
    this.load();
  },

  async load() {
    const enabledModules = getEnabledModules();
    const classId = getActiveClassId();
    const timelineEnabled = isModuleEnabled("timeline", enabledModules);
    if (!timelineEnabled) {
      this.setData({ timelines: [], timelineEnabled: false });
      return;
    }
    this.setData({ loading: true });
    try {
      const currentUser = getApp().globalData.user || wx.getStorageSync("auth_user") || {};
      const res = await get("/api/timeline/", { page_size: 20, class_id: classId });
      const commentResults = await Promise.all(
        (res.items || []).map((item) =>
          get(`/api/timeline/${item.id}/comments`, { page_size: 6 }).catch(() => ({ items: [] }))
        )
      );
      const timelines = (res.items || []).map((item, index) => (
        normalizeTimeline(item, commentResults[index].items || [], currentUser.id)
      ));
      this.setData({ timelines, timelineEnabled: true });
    } catch (error) {
      showError(error);
    } finally {
      this.setData({ loading: false });
    }
  },

  openTimeline(event) {
    wx.navigateTo({ url: `/pages/timeline-detail/index?id=${event.currentTarget.dataset.id}` });
  },

  openCompose() {
    wx.navigateTo({ url: "/pages/timeline-create/index" });
  },

  previewImage(event) {
    const current = event.currentTarget.dataset.src;
    const postId = Number(event.currentTarget.dataset.postId);
    const postItem = this.data.timelines.find((item) => item.id === postId);
    const urls = postItem && postItem.image_urls ? postItem.image_urls : [];
    if (!current || !urls.length) return;
    wx.previewImage({ current, urls });
  },

  async toggleLike(event) {
    const id = Number(event.currentTarget.dataset.id);
    if (!id || this.data.likingId) return;
    this.setData({ likingId: id });
    try {
      const result = await post(`/api/timeline/${id}/like`);
      const timelines = this.data.timelines.map((item) => {
        if (item.id !== id) return item;
        return normalizeTimeline({
          ...item,
          has_liked: Boolean(result.liked),
          like_count: Number(result.like_count || 0)
        }, item.comments || [], (getApp().globalData.user || wx.getStorageSync("auth_user") || {}).id);
      });
      this.setData({ timelines });
    } catch (error) {
      showError(error, "操作失败");
    } finally {
      this.setData({ likingId: null });
    }
  },

  openComment(event) {
    const id = Number(event.currentTarget.dataset.id);
    const postItem = this.data.timelines.find((item) => item.id === id);
    this.setData({
      commentPostId: id,
      commentText: "",
      replyToName: "",
      commentPlaceholder: postItem ? `评论 ${postItem.author_name}` : "写评论",
      commentInputFocus: false
    }, () => {
      this.focusCommentInput();
    });
  },

  replyComment(event) {
    const postId = Number(event.currentTarget.dataset.postId);
    const commentId = Number(event.currentTarget.dataset.commentId);
    const name = event.currentTarget.dataset.name || "";
    const canDelete = datasetBoolean(event.currentTarget.dataset.canDelete);
    if (canDelete && commentId) {
      this.openOwnCommentActions(postId, commentId, name);
      return;
    }
    this.startReply(postId, name);
  },

  startReply(postId, name) {
    this.setData({
      commentPostId: postId,
      commentText: "",
      replyToName: name,
      commentPlaceholder: name ? `回复 ${name}` : "写评论",
      commentInputFocus: false
    }, () => {
      this.focusCommentInput();
    });
  },

  closeComment() {
    if (this.data.commenting) return;
    this.setData({
      commentPostId: null,
      commentText: "",
      replyToName: "",
      commentInputFocus: false,
      keyboardOpen: false
    });
  },

  noop() {},

  onCommentInput(event) {
    this.setData({ commentText: event.detail.value });
  },

  onCommentFocus(event) {
    const height = event.detail.height || 0;
    this.setData({
      commentInputFocus: true,
      keyboardOpen: height > 0
    });
  },

  onKeyboardHeightChange(event) {
    const height = event.detail.height || 0;
    this.setData({ keyboardOpen: height > 0 });
  },

  onCommentBlur() {
    this.setData({ commentInputFocus: false, keyboardOpen: false });
  },

  focusCommentInput() {
    const focus = () => {
      if (this.data.commentPostId) {
        this.setData({ commentInputFocus: true });
      }
    };
    if (wx.nextTick) {
      wx.nextTick(() => setTimeout(focus, 120));
      return;
    }
    setTimeout(focus, 120);
  },

  async submitComment() {
    const postId = this.data.commentPostId;
    const text = this.data.commentText.trim();
    if (!postId || !text) {
      wx.showToast({ title: "请输入评论", icon: "none" });
      return;
    }
    const content = this.data.replyToName ? `回复 @${this.data.replyToName}：${text}` : text;
    this.setData({ commenting: true });
    try {
      await post(`/api/timeline/${postId}/comments`, { content });
      const detail = await get(`/api/timeline/${postId}`);
      const currentUser = getApp().globalData.user || wx.getStorageSync("auth_user") || {};
      const timelines = this.data.timelines.map((item) => (
        item.id === postId ? normalizeTimeline(detail, detail.comments || [], currentUser.id) : item
      ));
      this.setData({
        timelines,
        commentPostId: null,
        commentText: "",
        replyToName: "",
        commentInputFocus: false,
        keyboardOpen: false
      });
      wx.showToast({ title: "已评论", icon: "success" });
    } catch (error) {
      showError(error, "评论失败");
    } finally {
      this.setData({ commenting: false });
    }
  },

  deleteComment(postId, commentId) {
    wx.showModal({
      title: "删除评论",
      content: "确认删除这条评论？",
      confirmText: "删除",
      confirmColor: "#b42318",
      success: async (res) => {
        if (!res.confirm) return;
        try {
          await del(`/api/timeline/comments/${commentId}`);
          const detail = await get(`/api/timeline/${postId}`);
          const currentUser = getApp().globalData.user || wx.getStorageSync("auth_user") || {};
          const timelines = this.data.timelines.map((item) => (
            item.id === postId ? normalizeTimeline(detail, detail.comments || [], currentUser.id) : item
          ));
          this.setData({ timelines });
          wx.showToast({ title: "已删除", icon: "success" });
        } catch (error) {
          showError(error, "删除失败");
        }
      }
    });
  },

  openOwnCommentActions(postId, commentId, name) {
    wx.showActionSheet({
      itemList: ["回复", "删除评论"],
      itemColor: "#6b1f2b",
      success: (res) => {
        if (res.tapIndex === 0) {
          this.startReply(postId, name);
        }
        if (res.tapIndex === 1) {
          this.deleteComment(postId, commentId);
        }
      }
    });
  }
});