const { API } = require('../../../utils/constants');
const { request } = require('../../../utils/http');

function toNumber(v, fallback = 0) {
  const n = Number(v);
  return Number.isFinite(n) ? n : fallback;
}

function formatMoney(v) {
  const n = toNumber(v, 0);
  return (Math.round(n * 100) / 100).toFixed(2).replace(/\.00$/, '');
}

function genderText(v) {
  if (v == null) return '';
  const s = String(v).toLowerCase();
  if (s === 'male' || s === 'm' || s === '1') return '男';
  if (s === 'female' || s === 'f' || s === '2') return '女';
  return '';
}

Page({
  data: {
    registrationId: null,
    loading: true,
    calculating: false,

    refundRulesText: '退款规则以赛事说明为准',

    items: [],
    selectAll: false,
    selectedCount: 0,
    refundAmount: '0',
    refundableAmount: '0',
    actualPaidAmount: '',
    refundedAmount: '0'
  },

  onLoad(options) {
    const registrationId = Number(options.registrationId);
    this.setData({ registrationId });
    if (!registrationId) {
      this.setData({ loading: false });
      wx.showToast({ title: '参数错误', icon: 'none' });
      return;
    }
    this.fetchRegistrationDetail(registrationId);
  },

  fetchRegistrationDetail(registrationId) {
    this.setData({ loading: true });
    request({
      path: API.myRegistrationDetail(registrationId),
      method: 'GET',
      needAuth: true
    })
      .then((detail) => {
        const d = detail && typeof detail === 'object' ? detail : {};
        
        const paymentStatus = d.paymentStatus != null ? Number(d.paymentStatus) : null;
        if (paymentStatus === 3) {
          wx.showModal({
            title: '提示',
            content: '该报名已取消，无法继续操作',
            showCancel: false,
            confirmText: '确定',
            success: () => {
              wx.navigateBack();
            }
          });
          this.setData({ loading: false });
          return;
        }

        const rawItems = Array.isArray(d.items) ? d.items : [];

        const items = rawItems.map((it, idx) => {
          const projectName = it.projectName || it.ProjectName || `项目${idx + 1}`;
          const groupName = it.groupName || it.GroupName || '';
          const price = it.price != null ? toNumber(it.price, 0) : 0;
          const persons = Array.isArray(it.persons) ? it.persons : [];

          const pills =
            persons.length > 0
              ? persons.map((p, pi) => {
                  const gender = genderText(p.gender);
                  const label = [groupName, gender].filter(Boolean).join(' | ') || groupName || '参赛人';
                  return {
                    pillKey: `i-${idx}-p-${pi}`,
                    personId: p.id,
                    label,
                    price,
                    selected: false
                  };
                })
              : [
                  {
                    pillKey: `i-${idx}-g`,
                    groupId: it.id,
                    label: groupName || '组别',
                    price,
                    selected: false
                  }
                ];

          return {
            itemKey: `it-${idx}`,
            projectName,
            pills
          };
        });

        const refundRulesText = d.refundRulesText || d.RefundRulesText || '退款规则以赛事说明为准';

        this.setData({
          items,
          selectAll: false,
          refundRulesText,
          loading: false
        });
        
        this.recalcFromBackend();
      })
      .catch((err) => {
        this.setData({ loading: false, items: [] });
        wx.showToast({ title: (err && err.message) || '加载失败', icon: 'none' });
      });
  },

  onTogglePill(e) {
    const pillKey = e.currentTarget.dataset.pillkey;
    if (!pillKey) return;
    const items = this.data.items.map((it) => ({
      ...it,
      pills: it.pills.map((p) => (p.pillKey === pillKey ? { ...p, selected: !p.selected } : p))
    }));
    this.setData({ items });
    this.recalcFromBackend();
  },

  onToggleAll() {
    const next = !this.data.selectAll;
    const items = this.data.items.map((it) => ({
      ...it,
      pills: it.pills.map((p) => ({ ...p, selected: next }))
    }));
    this.setData({ items, selectAll: next });
    this.recalcFromBackend();
  },

  recalcFromBackend() {
    const all = [];
    this.data.items.forEach((it) => it.pills.forEach((p) => all.push(p)));
    const selected = all.filter((p) => p.selected);
    const selectAll = all.length > 0 && selected.length === all.length;
    
    this.setData({
      selectedCount: selected.length,
      selectAll
    });

    const personIds = [];
    const cancelTeams = [];
    selected.forEach((p) => {
      if (p.personId) {
        personIds.push(p.personId);
      } else if (p.groupId) {
        cancelTeams.push(`${p.groupId}_team`);
      }
    });

    this.setData({ calculating: true });
    request({
      path: API.calculateRefundAmount,
      method: 'POST',
      needAuth: true,
      data: {
        registrationId: this.data.registrationId,
        cancelType: selectAll ? 0 : 1,
        personIds: personIds.length > 0 ? personIds : null,
        cancelTeams: cancelTeams.length > 0 ? cancelTeams : null
      }
    })
      .then((result) => {
        const r = result && typeof result === 'object' ? result : {};
        this.setData({
          calculating: false,
          // 如果没有选择项目，退款金额显示为 0
          refundAmount: selected.length > 0 ? formatMoney(r.refundAmount) : '0',
          refundableAmount: formatMoney(r.refundableAmount),
          actualPaidAmount: formatMoney(r.actualPaidAmount),
          refundedAmount: formatMoney(r.refundedAmount)
        });
      })
      .catch((err) => {
        this.setData({ calculating: false });
        wx.showToast({ title: (err && err.message) || '计算退款金额失败', icon: 'none' });
      });
  },

  onConfirmCancel() {
    if (this.data.selectedCount === 0) return;
    wx.showModal({
      title: '确认取消报名？',
      content: `本次预计退款金额 ¥${this.data.refundAmount}`,
      cancelText: '取消',
      confirmText: '确定',
      success: (res) => {
        if (!res || !res.confirm) return;
        this.submitCancelRegistration();
      }
    });
  },

  submitCancelRegistration() {
    const all = [];
    this.data.items.forEach((it) => it.pills.forEach((p) => all.push(p)));
    const selected = all.filter((p) => p.selected);
    const selectAll = all.length > 0 && selected.length === all.length;
    
    const personIds = [];
    const cancelTeams = [];
    selected.forEach((p) => {
      if (p.personId) {
        personIds.push(p.personId);
      } else if (p.groupId) {
        cancelTeams.push(`${p.groupId}_team`);
      }
    });

    wx.showLoading({ title: '提交中...' });
    request({
      path: API.cancelRegistrationRefund,
      method: 'POST',
      needAuth: true,
      data: {
        registrationId: this.data.registrationId,
        cancelType: selectAll ? 0 : 1,
        personIds: personIds.length > 0 ? personIds : null,
        cancelTeams: cancelTeams.length > 0 ? cancelTeams : null,
        refundReason: '用户取消报名'
      }
    })
      .then(() => {
        wx.hideLoading();
        wx.showToast({ title: '退款申请已提交', icon: 'success' });
        setTimeout(() => {
          const pages = getCurrentPages();
          if (pages.length > 1) {
            const prevPage = pages[pages.length - 2];
            if (prevPage && prevPage.route && prevPage.route.includes('records')) {
              if (prevPage.initData) {
                prevPage.initData(true);
              }
            }
          }
          wx.navigateBack();
        }, 1500);
      })
      .catch((err) => {
        wx.hideLoading();
        wx.showToast({ title: (err && err.message) || '提交失败，请稍后重试', icon: 'none' });
      });
  }
});