<script setup lang="ts">
import { computed, ref } from 'vue'
import { BarChart3, CheckCircle2, ExternalLink, TrendingUp } from '@lucide/vue'
import { RouterLink } from 'vue-router'

import AdminPageHeader from '../../components/admin/AdminPageHeader.vue'
import AdminSeasonToolbar from '../../components/admin/AdminSeasonToolbar.vue'
import { useAdminAnalyticsManager } from '../../components/admin/useAdminAnalyticsManager'
import Card from '../../components/ui/Card.vue'
import NativeSelect from '../../components/ui/NativeSelect.vue'

const {
  categoryHealth,
  categoryGroups,
  metricCards,
  readinessCards,
  insightCards,
  attentionItems,
  topCategoriesEnriched,
  winnerCoveragePct,
  readinessPct,
  healthSummary,
  totalVotes,
} = useAdminAnalyticsManager()

const healthFilter = ref<string>('Alle')
const groupFilter = ref<string>('Alle')

const groupOptions = computed(() => ['Alle', ...categoryGroups.value.map((g) => g.name)])

const filteredHealth = computed(() => {
  let list = categoryHealth.value
  if (healthFilter.value !== 'Alle') list = list.filter((c) => c.status === healthFilter.value)
  if (groupFilter.value !== 'Alle') list = list.filter((c) => (c.groupName || 'Ohne Gruppe') === groupFilter.value)
  return list
})

const healthStatusOptions = [
  { key: 'Alle', label: 'Alle' },
  { key: 'Leer', label: 'Leer', dot: 'bg-rose-400' },
  { key: 'Review offen', label: 'Review offen', dot: 'bg-amber-400' },
  { key: 'Bereit', label: 'Bereit', dot: 'bg-sky-400' },
  { key: 'Gewinner gesetzt', label: 'Gewinner', dot: 'bg-emerald-400' },
]
</script>

<template>
  <div class="space-y-6">
    <AdminPageHeader
      eyebrow="Analytics"
      description="Jahresmetriken, Readiness und Kategoriegesundheit auf einen Blick."
      :icon="BarChart3"
    />

    <AdminSeasonToolbar />

    <!-- Metric cards -->
    <section class="grid gap-4 md:grid-cols-2 xl:grid-cols-4">
      <Card v-for="metric in metricCards" :key="metric.label" class="p-5">
        <div class="flex items-start justify-between gap-4">
          <div>
            <p class="text-xs font-semibold uppercase tracking-[0.18em] text-slate-500">{{ metric.label }}</p>
            <strong class="mt-2 block text-3xl text-slate-950">{{ metric.value.toLocaleString('de-DE') }}</strong>
            <p class="mt-1 text-sm text-slate-500">{{ metric.note }}</p>
          </div>
          <span class="grid h-11 w-11 shrink-0 place-items-center rounded-2xl border" :class="metric.tone">
            <component :is="metric.icon" class="h-5 w-5" />
          </span>
        </div>
      </Card>
    </section>

    <!-- Readiness + Attention row -->
    <section class="grid gap-6 xl:grid-cols-[minmax(0,1fr)_minmax(0,1fr)]">
      <!-- Readiness -->
      <Card class="p-6">
        <div class="flex items-start justify-between gap-4">
          <div>
            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Readiness</p>
            <h2 class="mt-1 text-xl font-bold text-slate-900">Finale Vollständigkeit</h2>
          </div>
          <div class="text-right">
            <div class="text-2xl font-black text-violet-700">{{ winnerCoveragePct }}%</div>
            <div class="text-xs font-semibold text-slate-500">Gewinner</div>
          </div>
        </div>

        <!-- Progress bar -->
        <div class="mt-4 space-y-2">
          <div class="flex items-center justify-between text-xs font-semibold text-slate-500">
            <span>Gesamt-Readiness</span><span>{{ readinessPct }}%</span>
          </div>
          <div class="h-2.5 overflow-hidden rounded-full bg-slate-100">
            <div
              class="h-full rounded-full bg-[linear-gradient(90deg,#8b5cf6,#22c55e)] transition-all duration-500"
              :style="{ width: `${readinessPct}%` }"
            />
          </div>
          <!-- Health segments legend -->
          <div class="flex flex-wrap gap-x-4 gap-y-1 pt-1">
            <span class="flex items-center gap-1.5 text-[11px] font-semibold text-rose-600">
              <span class="h-2 w-2 rounded-full bg-rose-400" />{{ healthSummary.leer }} Leer
            </span>
            <span class="flex items-center gap-1.5 text-[11px] font-semibold text-amber-600">
              <span class="h-2 w-2 rounded-full bg-amber-400" />{{ healthSummary.reviewOffen }} Review offen
            </span>
            <span class="flex items-center gap-1.5 text-[11px] font-semibold text-sky-600">
              <span class="h-2 w-2 rounded-full bg-sky-400" />{{ healthSummary.bereit }} Bereit
            </span>
            <span class="flex items-center gap-1.5 text-[11px] font-semibold text-emerald-600">
              <span class="h-2 w-2 rounded-full bg-emerald-400" />{{ healthSummary.gewinner }} Gewinner
            </span>
          </div>
        </div>

        <div class="mt-5 grid gap-3">
          <RouterLink
            v-for="item in readinessCards"
            :key="item.label"
            :to="item.to"
            class="flex items-start gap-4 rounded-[22px] border border-violet-100 bg-white p-4 transition hover:bg-violet-50/60"
          >
            <span class="grid h-11 w-11 shrink-0 place-items-center rounded-2xl bg-violet-100 text-violet-700">
              <component :is="item.icon" class="h-5 w-5" />
            </span>
            <span class="min-w-0">
              <span class="block text-sm font-semibold text-slate-500">{{ item.label }}</span>
              <strong class="mt-1 block text-2xl leading-tight text-slate-950">{{ item.value }}</strong>
              <span class="mt-1 block text-sm leading-5 text-slate-500">{{ item.note }}</span>
            </span>
          </RouterLink>
        </div>
      </Card>

      <!-- Attention + Insights -->
      <div class="space-y-6">
        <!-- Attention items -->
        <Card class="p-6">
          <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Aufmerksamkeit</p>
          <h2 class="mt-1 text-xl font-bold text-slate-900">Was zuerst prüfen</h2>
          <div class="mt-5 grid gap-3 sm:grid-cols-3">
            <RouterLink
              v-for="item in attentionItems"
              :key="item.key"
              :to="item.to"
              class="rounded-[22px] border p-4 transition hover:translate-y-[-1px]"
              :class="item.tone"
            >
              <strong class="block text-3xl leading-none">{{ item.value }}</strong>
              <span class="mt-3 block text-sm font-bold">{{ item.label }}</span>
              <span class="mt-1 block text-xs leading-5 opacity-80">{{ item.note }}</span>
            </RouterLink>
          </div>
        </Card>

        <!-- Insight cards -->
        <Card class="p-6">
          <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Einblicke</p>
          <h2 class="mt-1 text-xl font-bold text-slate-900">Kennzahlen</h2>
          <div class="mt-5 grid gap-3 sm:grid-cols-3">
            <div v-for="insight in insightCards" :key="insight.label" class="rounded-[22px] border border-violet-100 bg-violet-50/50 p-4">
              <component :is="insight.icon" class="h-5 w-5 text-violet-600" />
              <p class="mt-3 text-xs font-semibold uppercase tracking-[0.16em] text-slate-500">{{ insight.label }}</p>
              <strong class="mt-1 block text-2xl text-slate-950">{{ insight.value }}</strong>
              <p class="mt-1 text-xs leading-5 text-slate-500">{{ insight.note }}</p>
            </div>
          </div>
        </Card>
      </div>
    </section>

    <!-- Vote distribution bar chart (improved) -->
    <Card class="overflow-hidden">
      <div class="border-b border-violet-100 bg-gradient-to-br from-white via-violet-50/40 to-[#f7eef8] p-5">
        <div class="flex items-center justify-between gap-4">
          <div>
            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Stimmenverteilung</p>
            <h2 class="mt-1 text-xl font-bold text-slate-900">Top Kategorien nach Votes</h2>
          </div>
          <div class="flex items-center gap-2 rounded-2xl border border-violet-100 bg-white px-4 py-2.5">
            <TrendingUp class="h-4 w-4 text-violet-600" />
            <span class="text-sm font-bold text-violet-800">{{ totalVotes.toLocaleString('de-DE') }} Gesamt</span>
          </div>
        </div>
      </div>

      <div v-if="topCategoriesEnriched.length > 0" class="divide-y divide-violet-50">
        <div
          v-for="(cat, index) in topCategoriesEnriched"
          :key="cat.category"
          class="group/bar px-6 py-4 transition hover:bg-violet-50/40"
        >
          <div class="flex items-center gap-4">
            <!-- Rank -->
            <span class="w-6 shrink-0 text-center text-xs font-black text-slate-400">{{ index + 1 }}</span>

            <!-- Name + bar -->
            <div class="min-w-0 flex-1">
              <div class="flex items-center justify-between gap-4">
                <span class="truncate text-sm font-semibold text-slate-800">{{ cat.category }}</span>
                <div class="flex shrink-0 items-center gap-3">
                  <!-- Pct badge -->
                  <span class="min-w-[44px] text-right text-xs font-bold text-violet-600 opacity-0 transition group-hover/bar:opacity-100">
                    {{ cat.pct }}%
                  </span>
                  <!-- Vote count -->
                  <span class="min-w-[56px] text-right text-sm font-semibold text-slate-600">
                    {{ cat.votes.toLocaleString('de-DE') }}
                  </span>
                </div>
              </div>
              <div class="relative mt-2 h-2.5 overflow-hidden rounded-full bg-violet-100">
                <div
                  class="h-full rounded-full bg-[linear-gradient(90deg,#8b5cf6,#a78bfa)] transition-all duration-500"
                  :style="{ width: `${cat.barWidth}%` }"
                />
              </div>
            </div>
          </div>
        </div>
      </div>

      <div v-else class="px-6 py-12 text-center text-sm text-slate-500">
        Noch keine Stimmenverteilung vorhanden.
      </div>
    </Card>

    <!-- Category health -->
    <Card class="overflow-hidden">
      <div class="border-b border-violet-100 p-5">
        <div class="flex flex-wrap items-start justify-between gap-4">
          <div>
            <p class="text-xs font-semibold uppercase tracking-[0.24em] text-violet-500">Kategoriegesundheit</p>
            <h2 class="mt-1 text-xl font-bold text-slate-900">Status aller Kategorien</h2>
          </div>
          <!-- Filters -->
          <div class="flex flex-wrap gap-2">
            <NativeSelect
              v-model="groupFilter"
              class="w-44"
              :options="groupOptions.map((group) => ({ label: group, value: group }))"
            />
            <div class="flex flex-wrap gap-1.5">
              <button
                v-for="opt in healthStatusOptions"
                :key="opt.key"
                type="button"
                class="flex h-9 items-center gap-1.5 rounded-xl border px-3 text-xs font-semibold transition"
                :class="healthFilter === opt.key ? 'border-violet-200 bg-violet-100 text-violet-800' : 'border-violet-100 bg-white text-slate-600 hover:bg-violet-50'"
                @click="healthFilter = opt.key"
              >
                <span v-if="opt.dot" class="h-2 w-2 rounded-full" :class="opt.dot" />
                {{ opt.label }}
              </button>
            </div>
          </div>
        </div>
      </div>

      <div v-if="filteredHealth.length > 0" class="divide-y divide-violet-50">
        <RouterLink
          v-for="category in filteredHealth"
          :key="category.id"
          to="/admin/categories"
          class="grid items-center gap-3 px-5 py-3.5 transition hover:bg-violet-50/50 sm:grid-cols-[minmax(0,1fr)_80px_80px_100px_140px]"
        >
          <!-- Name + group -->
          <span class="min-w-0">
            <span class="flex items-center gap-2">
              <span class="h-2 w-2 shrink-0 rounded-full" :class="category.statusDot" />
              <strong class="truncate text-sm text-slate-900">{{ category.name }}</strong>
            </span>
            <span class="mt-0.5 block truncate text-xs text-slate-500 pl-4">{{ category.groupName || 'Ohne Gruppe' }}</span>
          </span>

          <!-- Candidates -->
          <span class="text-sm text-slate-500">
            <strong class="block text-slate-900">{{ category.candidates }}</strong>
            Kandidaten
          </span>

          <!-- Reviews -->
          <span class="text-sm" :class="category.reviews > 0 ? 'text-amber-600 font-semibold' : 'text-slate-500'">
            <strong class="block" :class="category.reviews > 0 ? 'text-amber-700' : 'text-slate-900'">{{ category.reviews }}</strong>
            Reviews
          </span>

          <!-- Votes + pct -->
          <span class="text-sm text-slate-500">
            <strong class="block text-slate-900">{{ category.votes.toLocaleString('de-DE') }}</strong>
            <span class="text-violet-600 font-semibold">{{ category.votePct }}%</span>
          </span>

          <!-- Status badge -->
          <span class="inline-flex items-center gap-1.5 rounded-full border px-3 py-1 text-xs font-bold" :class="category.statusClass">
            <CheckCircle2 v-if="category.status === 'Gewinner gesetzt'" class="h-3 w-3" />
            {{ category.status }}
          </span>
        </RouterLink>
      </div>

      <div v-else class="px-5 py-12 text-center text-sm text-slate-500">
        Keine Kategorien für diesen Filter.
      </div>

      <div class="flex items-center gap-2 border-t border-violet-100 bg-emerald-50/60 px-5 py-3 text-sm text-emerald-800">
        <CheckCircle2 class="h-4 w-4 shrink-0 text-emerald-500" />
        Analytics nutzt dieselben Admin-Daten wie Dashboard, Jahre und Kategorien.
        <RouterLink to="/admin/categories" class="ml-auto flex items-center gap-1 text-xs font-semibold text-violet-600 hover:text-violet-800">
          Kategorien bearbeiten <ExternalLink class="h-3 w-3" />
        </RouterLink>
      </div>
    </Card>
  </div>
</template>
