<template>
  <BasicModal width="95%" max-width="42rem" min-width="auto" :show-close-button="true">
    <template #default="{ close }">
      <div class="add-session">
        <LineTitleBlock title="افزودن جلسه" title-en="Add" />

        <div class="add-session__search">
          <SvgIcon name="book" :size="18" color="var(--color-thd-gray)" />
          <input
            v-model="searchInput"
            type="text"
            class="add-session__search-input"
            placeholder="عنوان جلسه مورد نظر را جست‌وجو کنید"
            @input="onSearchInput"
          />
        </div>

        <SkeletonLoaderBlock v-if="isLoading" :rows="4" :cols-per-row="1" />

        <div v-else-if="sessions.length > 0" class="add-session__list">
          <div v-for="session in sessions" :key="session.id" class="add-session__row">
            <div class="add-session__main">
              <div class="add-session__image">
                <img v-if="session.image" :src="session.image" :alt="session.title" />
                <SvgIcon v-else name="book" :size="20" color="#bcbcbc" />
              </div>
              <div class="add-session__text">
                <p class="add-session__title">
                  {{ session.title || `جلسه ${session.order || ''}` }}
                </p>
                <p class="add-session__teacher">
                  <SvgIcon name="user" :size="11" color="#bcbcbc" />
                  <span class="add-session__teacher-label">استاد:</span>
                  <span class="add-session__teacher-name">{{ teacherName(session) }}</span>
                </p>
              </div>
            </div>

            <CircleButton
              v-if="isAttached(session.id)"
              tooltip="حذف از دوره"
              bg-color="rgba(104, 104, 104, 0.05)"
              size="2.25rem"
              type="button"
              :loading="pendingId === session.id"
              @click="onDetach(session)"
            >
              <template #icon>
                <SvgIcon name="trash" :size="16" color="var(--color-error)" />
              </template>
            </CircleButton>
            <CircleButton
              v-else
              tooltip="افزودن به دوره"
              bg-color="rgba(104, 104, 104, 0.05)"
              size="2.25rem"
              type="button"
              :loading="pendingId === session.id"
              @click="onAttach(session)"
            >
              <template #icon>
                <SvgIcon name="plus" :size="16" color="var(--color-sec-gray)" />
              </template>
            </CircleButton>
          </div>
        </div>

        <NoItems v-else title="بدون نتیجه" desc="جلسه‌ای یافت نشد." />

        <div class="add-session__divider" />

        <div class="add-session__footer">
          <BaseButton text="تایید" custom-class="add-session__close-btn" @click="close">
            <template #appendIcon>
              <SvgIcon name="arrow-left" :size="18" color="#fff" />
            </template>
          </BaseButton>
        </div>
      </div>
    </template>
  </BasicModal>
</template>

<script setup>
import { computed, ref, watch } from 'vue'
import { useQueryClient } from '@tanstack/vue-query'

import BasicModal from '@/components/BasicModal.vue'
import BaseButton from '@/components/BaseButton.vue'
import CircleButton from '@/components/CircleButton.vue'
import LineTitleBlock from '@/components/LineTitleBlock.vue'
import NoItems from '@/components/blocks/NoItems.vue'
import SkeletonLoaderBlock from '@/components/blocks/SkeletonLoaderBlock.vue'
import SvgIcon from '@/components/icons/SvgIcon.vue'
import useModal from '@/composables/useModal'
import useDebounce from '@/composables/useDebounce'
import { useAdminSessionsListQuery } from '@/services/query/admin-sessions'
import {
  adminCourseTemplatesKeys,
  useAdminTemplateSessionsQuery,
  useAttachAdminTemplateSessionMutation,
  useDetachAdminTemplateSessionMutation,
} from '@/services/query/admin-course-templates'

defineOptions({ name: 'AddSessionToCourseModal' })

const queryClient = useQueryClient()
const { getModal } = useModal()

const modalData = computed(() => getModal('AddSessionToCourseModal')?.data ?? {})
const templateId = computed(() => modalData.value.templateId ?? null)

const searchInput = ref('')
const searchQuery = ref('')
const sessionFilters = computed(() => ({ title: searchQuery.value }))
const sessionPagination = ref({ page: 1, perPage: 20 })

const { data: sessionsResponse, isLoading } = useAdminSessionsListQuery(
  sessionFilters,
  sessionPagination
)
const sessions = computed(() => sessionsResponse.value?.data ?? [])

const attachedFilters = computed(() => ({}))
const attachedPagination = ref({ page: 1, perPage: 200 })
const { data: attachedResponse } = useAdminTemplateSessionsQuery(
  templateId,
  attachedFilters,
  attachedPagination,
  { enabled: () => !!templateId.value }
)
const attachedIds = computed(() => new Set((attachedResponse.value?.data ?? []).map((s) => s.id)))

const isAttached = (id) => attachedIds.value.has(id)

const teacherName = (session) => {
  const t = session.teacher || session.defaultTeacher
  if (!t) return '—'
  return `${t.firstName || ''} ${t.lastName || ''}`.trim() || t.fullName || '—'
}

const onSearchInput = useDebounce(() => {
  searchQuery.value = searchInput.value || ''
  sessionPagination.value = { ...sessionPagination.value, page: 1 }
}, 400)

const pendingId = ref(null)

const attachMutation = useAttachAdminTemplateSessionMutation()
const detachMutation = useDetachAdminTemplateSessionMutation()

const invalidate = () => queryClient.invalidateQueries({ queryKey: adminCourseTemplatesKeys.all })

const onAttach = async (session) => {
  if (!templateId.value) return
  pendingId.value = session.id
  try {
    await attachMutation.mutateAsync({
      templateId: templateId.value,
      payload: { sessionIds: [session.id] },
    })
    invalidate()
  } finally {
    pendingId.value = null
  }
}

const onDetach = async (session) => {
  if (!templateId.value) return
  pendingId.value = session.id
  try {
    await detachMutation.mutateAsync({ templateId: templateId.value, sessionId: session.id })
    invalidate()
  } finally {
    pendingId.value = null
  }
}

watch(templateId, () => {
  searchInput.value = ''
  searchQuery.value = ''
  pendingId.value = null
})
</script>

<style lang="scss" scoped>
.add-session {
  width: 100%;
  text-align: start;
  padding: 0.5rem 0.25rem;

  &__search {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-block: 1rem;
    padding: 0 1rem;
    height: 2.75rem;
    border: 1px solid var(--color-thd-gray);
    border-radius: 9999px;
    background: #fff;
  }

  &__search-input {
    flex: 1;
    border: none;
    outline: none;
    background: transparent;
    font-family: var(--font-family-fa);
    font-size: 0.875rem;
    color: #4b4b4b;
    text-align: start;

    &::placeholder {
      color: var(--color-prim-gray);
    }
  }

  &__list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    max-height: 22rem;
    overflow-y: auto;
    padding-inline-end: 0.25rem;
  }

  &__row {
    display: flex;
    align-items: center;
    gap: 0.625rem;
    padding: 0.625rem 0.875rem;
    background: rgba(255, 255, 255, 85%);
    border-radius: 0.875rem;
    box-shadow: 0 4px 10px -6px rgba(241, 241, 241, 70%);
  }

  &__main {
    flex: 1;
    display: flex;
    align-items: center;
    gap: 0.625rem;
    min-width: 0;
  }

  &__image {
    width: 2.5rem;
    height: 2.5rem;
    border-radius: 0.5rem;
    overflow: hidden;
    background: #f5f5f5;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;

    img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
  }

  &__text {
    min-width: 0;
  }

  &__title {
    font-family: var(--font-family-fa);
    font-size: 0.95rem;
    color: #4b4b4b;
    margin: 0 0 0.25rem;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  &__teacher {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-family: var(--font-family-fa);
    font-size: 0.75rem;
    color: #848484;
    margin: 0;
  }

  &__teacher-label {
    color: #b7b7b7;
  }

  &__divider {
    border-block-end: 1px solid var(--color-thd-gray);
    margin-block: 1rem;
  }

  &__footer {
    display: flex;
    justify-content: flex-start;
  }

  &__close-btn {
    min-width: 12rem;
  }
}
</style>
