<script setup lang="ts">
import { computed, onMounted, ref } from 'vue'
import { useI18n } from 'vue-i18n'
import { useRouter } from 'vue-router'
import { useToast } from 'gnexus-ui-kit/vue'
import { api, type Project } from '../api'
import { useRealtimeRefresh } from '../realtime'
import { relevanceLabel } from '../taskui'
import PriorityBadge from '../components/PriorityBadge.vue'
import ConfirmDialog from '../components/ConfirmDialog.vue'
import Pagination from '../components/Pagination.vue'

// Архив (ТЗ 3.11): история проектов. Архивный проект виден со всей
// историей задач (страница проекта доступна на чтение), его можно
// восстановить как был или удалить навсегда.

const { t } = useI18n()
const router = useRouter()
const toast = useToast()

const projects = ref<Project[]>([])
const error = ref('')
const loading = ref(false)

// Счётчики задач по проектам: всего / завершено (как на «Проектах»)
const taskCounts = ref(new Map<number, { total: number; done: number }>())

async function load() {
  loading.value = true
  error.value = ''
  try {
    const [archived, tasks] = await Promise.all([
      api.listProjects(true),
      api.listTasks({ include_archived: 'true' }),
    ])
    projects.value = archived
    const map = new Map<number, { total: number; done: number }>()
    tasks.forEach((task) => {
      if (!task.project) return
      const entry = map.get(task.project.id) ?? { total: 0, done: 0 }
      entry.total += 1
      if (task.status === 'done') entry.done += 1
      map.set(task.project.id, entry)
    })
    taskCounts.value = map
  } catch (e) {
    error.value = String(e)
  } finally {
    loading.value = false
  }
}

onMounted(load)

// Реактивность (ТЗ 3.14): архив/восстановление из другой вкладки или MCP
useRealtimeRefresh(load, ['project.changed', 'project.deleted'])

// Пагинация: по 30 проектов на страницу
const page = ref(1)
const pagedProjects = computed(() =>
  projects.value.slice((page.value - 1) * 30, page.value * 30),
)

function countsOf(id: number): { total: number; done: number } {
  return taskCounts.value.get(id) ?? { total: 0, done: 0 }
}

// Восстановить: проект возвращается в «Проекты» со всеми задачами
async function restore(project: Project) {
  try {
    await api.restoreProject(project.id)
    toast.success({ title: t('archive.restored', { name: project.name }) })
    await load()
  } catch (e) {
    toast.error({ title: t('common.error'), text: String(e) })
  }
}

// Удалить навсегда — через подтверждение
const deleteTarget = ref<Project | null>(null)
const confirmOpen = ref(false)

function askDelete(project: Project) {
  deleteTarget.value = project
  confirmOpen.value = true
}

async function remove() {
  const project = deleteTarget.value
  if (!project) return
  confirmOpen.value = false
  try {
    await api.deleteProject(project.id)
    toast.success({ title: t('common.projectDeleted') })
    await load()
  } catch (e) {
    toast.error({ title: t('common.error'), text: String(e) })
  }
}

const headerMeta = computed(() =>
  projects.value.length ? t('archive.count', { n: projects.value.length }) : '',
)
</script>

<template>
  <section>
    <GnPageHeader kicker="GNexus Tasks" :title="t('archive.title')">
      <template #meta>{{ headerMeta }}</template>
    </GnPageHeader>

    <GnAlert v-if="error" variant="error">{{ error }}</GnAlert>

    <GnSkeleton v-if="loading && projects.length === 0" type="block" stack :count="2" class="list-skeleton" />

    <GnEmptyState
      v-else-if="projects.length === 0"
      icon="ph-archive"
      :title="t('archive.emptyTitle')"
      :text="t('archive.emptyText')"
    />

    <div class="archive-list">
      <GnCard v-for="project in pagedProjects" :key="project.id" class="archive-card">
        <template #title>
          <RouterLink class="card-link" :to="`/projects/${project.id}`">{{ project.name }}</RouterLink>
        </template>

        <div class="archive-meta">
          <GnBadge variant="neutral"><i class="ph ph-activity" aria-hidden="true" />
            {{ relevanceLabel(project.relevance_status) }}
          </GnBadge>
          <PriorityBadge v-if="project.priority !== null" :priority="project.priority" />
          <GnBadge variant="neutral"><i class="ph ph-list-checks" aria-hidden="true" />
            {{ t('projects.taskCounts', countsOf(project.id)) }}
          </GnBadge>
        </div>

        <div class="form-actions">
          <GnButton variant="secondary" size="sm" icon="ph-arrow-square-out" @click="router.push(`/projects/${project.id}`)">
            {{ t('common.open') }}
          </GnButton>
          <GnButton variant="success" size="sm" icon="ph-arrow-counter-clockwise" @click="restore(project)">
            {{ t('archive.restore') }}
          </GnButton>
          <GnIconButton icon="ph-trash" :label="t('archive.deleteForever')" @click="askDelete(project)" />
        </div>
      </GnCard>
    </div>

    <Pagination v-model:page="page" :total="projects.length" />

    <ConfirmDialog
      v-model:open="confirmOpen"
      :title="t('common.confirmTitle')"
      :message="t('archive.deleteConfirm', { name: deleteTarget?.name ?? '' })"
      :confirm-text="t('archive.deleteForever')"
      :cancel-text="t('common.cancel')"
      confirm-variant="danger"
      confirm-icon="ph-trash"
      @confirm="remove"
    />
  </section>
</template>

<style scoped>
.archive-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.card-link {
  color: inherit;
  text-decoration: none;
}
.card-link:hover {
  color: var(--accent, #7aa2f7);
}
.list-skeleton {
  margin-bottom: 1rem;
}
.archive-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
}
.form-actions {
  display: flex;
  gap: 0.75rem;
  align-items: center;
}
</style>