import React, { useMemo } from 'react'
import { useParams } from 'react-router-dom'
import { Box, Heading, Tooltip, Text } from '@chakra-ui/react'
import dayjs from 'dayjs'

import { api } from '../../__data__/api/api'
import { PageLoader } from '../../components/page-loader/page-loader'

export const Attendance = () => {
  const { courseId } = useParams()
  const { data: attendance, isLoading } = api.useLessonListQuery(courseId, {
    selectFromResult: ({ data, isLoading }) => ({
      data: data?.body,
      isLoading,
    }),
  })
  const { data: courseInfo, isLoading: courseInfoIssLoading } =
    api.useGetCourseByIdQuery(courseId)

  const data = useMemo(() => {
    if (!attendance) return null

    const studentsMap = new Map()
    const teachersMap = new Map()

    attendance.forEach((lesson) => {
      lesson.teachers?.map((teacher: any) => {
        teachersMap.set(teacher.sub, {  id: teacher.sub, ...teacher, value: teacher.value || (teacher.family_name && teacher.given_name
          ? `${teacher.family_name} ${teacher.given_name}`
          : teacher.name || teacher.email || teacher.preferred_username || teacher.family_name || teacher.given_name), })
      })

      lesson.students.forEach((student) => {
        const current = studentsMap.get(student.sub) || {}

        studentsMap.set(student.sub, {
          ...student,
          id: student.sub,
          value: current.value || (student.family_name && student.given_name
              ? `${student.family_name} ${student.given_name}`
              : student.name || student.email || student.preferred_username || student.family_name || student.given_name),
        })
      })
    })

    const compare = Intl.Collator('ru').compare

    const students = [...studentsMap.values()]
    const taechers = [...teachersMap.values()]
    students.sort(({ family_name: name }, { family_name: nname }) =>
      compare(name, nname),
    )
    return {
      students,
      taechers,
    }
  }, [attendance])

  if (!data || isLoading || courseInfoIssLoading) {
    return <PageLoader />
  }

  return (
    <Box>
      <Box mt={12} mb={12}>
        <Heading>{courseInfo.name}</Heading>
      </Box>
      <Box>
        <table>
          <thead>
            <tr>
              {data.taechers.map(teacher => (
                <th id={teacher.id} key={teacher.id}>{teacher.value}</th>
              ))}
              <th>Дата</th>
              <th>Название занятия</th>
              {data.students.map((student) => (
                <th id={student.id || student.sub} key={student.sub}>{student.name || student.value || 'Имя не определено'}</th>
              ))}
            </tr>
          </thead>
          <tbody>
            {attendance.map((lesson, index) => (
              <tr key={lesson.name}>
                {data?.taechers?.map((teacher) => {

                  const wasThere = Boolean(lesson.teachers) &&
                    lesson?.teachers?.findIndex((u) => u.sub === teacher.sub) !== -1
                  return (
                    <td
                      style={{
                        textAlign: 'center',
                        backgroundColor: wasThere ? '#8ef78a' : '#e09797',
                      }}
                      key={teacher.sub}
                    >
                      {wasThere ? '+' : '-'}
                    </td>
                  )
                })}
                <td>{dayjs(lesson.date).format('DD.MM.YYYY')}</td>
                <td>{<ShortText text={lesson.name} />}</td>

                {data.students.map((st) => {
                  const wasThere =
                    lesson.students.findIndex((u) => u.sub === st.sub) !== -1
                  return (
                    <td
                      style={{
                        textAlign: 'center',
                        backgroundColor: wasThere ? '#8ef78a' : '#e09797',
                      }}
                      key={st.sub}
                    >
                      {wasThere ? '+' : '-'}
                    </td>
                  )
                })}
              </tr>
            ))}
          </tbody>
        </table>
      </Box>
    </Box>
  )
}

const ShortText = ({ text }: { text: string }) => {
  const needShortText = text.length > 20

  if (needShortText) {
    return (
      <Tooltip label="На страницу с лекциями" fontSize="12px" top="16px">
        <Text>{text.slice(0, 20)}...</Text>
      </Tooltip>
    )
  }

  return text
}