import { ref, watchEffect, nextTick } from 'vue';
import { GetMyTaskDailyDistribution, GetMyTaskMonthDistribution } from '@/api/user';
import { useRoute } from 'vue-router/composables';

import dayjs from 'dayjs';

export const weekList = [
  {
    name: '日',
    label: 'Sun'
  },
  {
    name: '一',
    label: 'Mon'
  },
  {
    name: '二',
    label: 'Tue'
  },
  {
    name: '三',
    label: 'Wed'
  },
  {
    name: '四',
    label: 'Thu'
  },
  {
    name: '五',
    label: 'Fri'
  },
  {
    name: '六',
    label: 'Sat'
  }
];

export const monthList = ref([
  {
    name: '01月',
    label: 'Jan',
    month: '01'
  },
  {
    name: '02月',
    label: 'Feb',
    month: '02'
  },
  {
    name: '03月',
    label: 'Mar',
    month: '03'
  },
  {
    name: '04月',
    label: 'Apr',
    month: '04'
  },
  {
    name: '05月',
    label: 'May',
    month: '05'
  },
  {
    name: '06月',
    label: 'Jun',
    month: '06'
  },
  {
    name: '07月',
    label: 'Jul',
    month: '07'
  },
  {
    name: '08月',
    label: 'Aug',
    month: '08'
  },
  {
    name: '09月',
    label: 'Sep',
    month: '09'
  },
  {
    name: '10月',
    label: 'Oct',
    month: '10'
  },
  {
    name: '11月',
    label: 'Nov',
    month: '11'
  },
  {
    name: '12月',
    label: 'Dec',
    month: '12'
  }
]);

// 日历显示模式
export const modeList = [
  {
    type: 'DAY',
    name: 'Key311'
  },
  {
    type: 'MONTH',
    name: 'Key310'
  }
];

/**
 * 日历方法
 * @param {Emits} emits
 */
export function useMonthlyCalendar(emits) {
  const route = useRoute();
  const dateSta = route.query.dateStamp;
  let dateStamp = dateSta ? new Date(dateSta) : new Date();

  let focusDate = ref(dateStamp.getDate()); // 选中的当前日期
  let focusMonth = ref(0); // 选中的当前月份
  let curYear = ref(dateStamp.getFullYear()); // 当前年份
  let curMonth = ref(dateStamp.getMonth() + 1); // 当前月份

  const DAY = modeList[0].type;
  const MONTH = modeList[1].type;

  let calendar = ref([]); // 日历数组

  let taskMonthDistribution = ref({}); // 任务每月分布
  watchEffect(() => {
    GetMyTaskMonthDistribution({ year_stamp: curYear.value }).then(({ status, ...data }) => {
      if (status !== 1) return;
      const taskMonthArr = {};
      for (const [key, value] of Object.entries(data)) {
        taskMonthArr[key.slice(5)] = value;
      }
      taskMonthDistribution.value = taskMonthArr;
    });
  });

  // 得到当前日历任务每日分布
  let date = ref(`${dateStamp.getFullYear()}-${dateStamp.getMonth() + 1}`);
  let taskDailyDistribution = ref({}); // 任务每日分布
  watchEffect(() => {
    curYear.value = dayjs(date.value).year();
    curMonth.value = dayjs(date.value).month() + 1;
    focusMonth.value = dayjs(date.value).month();
    GetMyTaskDailyDistribution({ month_stamp: date.value }).then(({ status, ...data }) => {
      if (status !== 1) return;
      const taskDailyArr = {};
      for (const [key, value] of Object.entries(data)) {
        taskDailyArr[key.slice(5)] = value;
      }
      taskDailyDistribution.value = taskDailyArr;
    });
  });

  const taskDailyClass = new Map([
    [0, ''],
    [1, 'has-task'],
    [2, 'task-completed']
  ]);

  // 得到日历每日样式
  function getTaskDailyClass(month, day) {
    const date = `${month < 10 ? '0' : ''}${month}-${day < 10 ? '0' : ''}${day}`;
    return date in taskDailyDistribution.value ? taskDailyClass.get(taskDailyDistribution.value[date]) : '';
  }

  // 得到日历每月样式
  function getTaskMonthClass(month) {
    return month in taskMonthDistribution.value ? taskDailyClass.get(taskMonthDistribution.value[month]) : '';
  }

  // 得到日历所需数组
  function getDateArr() {
    const daysInMonth = dayjs(date.value).daysInMonth();
    const dayOfWeek = dayjs(`${date.value}-1`).day();
    const curMonth = dayjs(date.value).month();
    const curYear = dayjs(date.value).year();
    const lastDays = dayjs(curMonth === 0 ? `${curYear - 1}-12` : `${curYear}-${curMonth}`).daysInMonth();

    const cDate = new Date();
    const curDate = cDate.getDate();
    const isThisMonth = curMonth === cDate.getMonth() && curYear === cDate.getFullYear();

    let arr = [];
    // 是否有上个月
    for (let i = 0; i < dayOfWeek; i++) {
      arr[i] = {
        key: `last-${i}`,
        month: (curMonth === 0 ? 11 : curMonth - 1) + 1,
        day: lastDays - dayOfWeek + i + 1,
        isCurMonth: false,
        isToday: false
      };
    }
    // 本月
    for (let j = 1; j <= daysInMonth; j++) {
      arr[j + dayOfWeek - 1] = {
        key: `cur-${j}`,
        month: curMonth + 1,
        day: j,
        isCurMonth: true,
        isToday: j === curDate && isThisMonth
      };
    }
    if (arr.length === 35) return (calendar.value = arr);
    // 下月
    let next = (arr.length < 35 ? 35 : 42) - dayOfWeek - daysInMonth;
    for (let k = 1; k <= next; k++) {
      arr.push({
        key: `next-${k}`,
        month: (curMonth === 11 ? 1 : curMonth + 1) + 1,
        day: k,
        isCurMonth: false,
        isToday: false
      });
    }
    calendar.value = arr;
  }
  getDateArr();

  // 返回今天
  function backToday() {
    const curDate = new Date();
    date.value = `${curDate.getFullYear()}-${curDate.getMonth() + 1}`;
    focusDate.value = curDate.getDate();
    focusMonth.value = curDate.getMonth();
    emits('changeDate');
    getDateArr();
  }

  /**
   * 日历模式切换
   */
  let time_unit = ref(modeList[0].type); // 当前日历模式
  let calendarStyle = ref(''); // 日历样式
  // 根据日历模式切换样式
  watchEffect(() => {
    if (time_unit.value === DAY) {
      return (calendarStyle.value = `40px repeat(${calendar.value.length > 35 ? 6 : 5}, 1fr) / repeat(7, 1fr)`);
    }
    if (time_unit.value === MONTH) return (calendarStyle.value = `repeat(4, 1fr) / repeat(3, 1fr)`);
  });

  // 月份向前或向后
  function changeMonth(type) {
    const curMonth = dayjs(date.value).month();
    const curYear = dayjs(date.value).year();
    if (type === 'pre' && time_unit.value === DAY) {
      date.value = curMonth === 0 ? `${curYear - 1}-12` : `${curYear}-${curMonth}`;
    }
    if (type === 'pre' && time_unit.value === MONTH) {
      date.value = `${curYear - 1}-${curMonth + 1}`;
    }

    if (type === 'next' && time_unit.value === DAY) {
      date.value = curMonth === 11 ? `${curYear + 1}-1` : `${curYear}-${curMonth + 2}`;
    }
    if (type === 'next' && time_unit.value === MONTH) {
      date.value = `${curYear + 1}-${curMonth + 1}`;
    }
    nextTick(() => {
      emits('changeDate');
    });
    getDateArr();
  }

  /**
   * 改变显示方式 日/月
   */
  function changeMenu(type) {
    time_unit.value = type;
    emits('changeTimeUnit');
  }

  // 日模式 -> 选择日期
  function selectDate(number, isCurMonth) {
    if (time_unit.value === DAY) {
      focusDate.value = number;
    }
    if (!isCurMonth) {
      return changeMonth(number < 7 ? 'next' : 'pre');
    }
    emits('changeDate');
  }

  // 月模式 -> 选择月份
  function selectMonth(number) {
    date.value = `${curYear.value}-${number + 1}`;
    focusMonth.value = number;
    nextTick(() => {
      emits('changeDate');
    });
    getDateArr();
  }

  return {
    DAY,
    MONTH,
    time_unit,
    curYear,
    curMonth,
    focusDate,
    calendarStyle,
    calendar,
    taskDailyDistribution,
    taskMonthDistribution,
    focusMonth,
    getTaskDailyClass,
    getTaskMonthClass,
    backToday,
    changeMonth,
    changeMenu,
    selectDate,
    selectMonth
  };
}