<script setup lang="ts">
import { computed, onMounted, ref } from 'vue'
import { FileText, AlertTriangle, AlertCircle, Info, Activity, ArrowLeft, Clock, Loader2 } from '@lucide/vue'
import { apiFetch } from '../services/api'
import { renderMarkdown } from '../utils/markdown'
import { useRouter } from 'vue-router'

interface IncidentFile {
  name: string
  title: string
  date: string | null
  severity: string
  excerpt: string
  size: number
}

interface IncidentDetail extends IncidentFile {
  content: string
}

const router = useRouter()

// State
const incidents = ref<IncidentFile[]>([])
const loading = ref(false)
const error = ref('')

const selectedIncident = ref<IncidentDetail | null>(null)
const contentLoading = ref(false)

// Sorted incidents (newest first by date)
const sortedIncidents = computed(() => {
  return [...incidents.value].sort((a, b) => {
    if (a.date && b.date) return b.date.localeCompare(a.date)
    if (a.date) return -1
    if (b.date) return 1
    return a.name.localeCompare(b.name)
  })
})

// Severity badge mapping
function severityClass(s: string): string {
  const lower = s.toLowerCase()
  if (lower.includes('critical')) return 'sev-critical'
  if (lower.includes('major')) return 'sev-major'
  if (lower.includes('minor')) return 'sev-minor'
  return 'sev-unknown'
}

function severityIcon(s: string) {
  const lower = s.toLowerCase()
  if (lower.includes('critical')) return AlertCircle
  if (lower.includes('major')) return AlertTriangle
  return Info
}

async function loadIncidents() {
  loading.value = true
  error.value = ''
  try {
    const response = await apiFetch('/api/v1/incidents')
    if (!response.ok) throw new Error('Failed to load incidents')
    incidents.value = await response.json()
  } catch (e) {
    error.value = e instanceof Error ? e.message : 'Failed to load incidents'
  } finally {
    loading.value = false
  }
}

async function loadIncidentContent(name: string) {
  contentLoading.value = true
  selectedIncident.value = null
  try {
    const response = await apiFetch(`/api/v1/incidents/${encodeURIComponent(name)}`)
    if (!response.ok) throw new Error('Failed to load incident')
    selectedIncident.value = await response.json()
  } catch (e) {
    error.value = e instanceof Error ? e.message : 'Failed to load incident'
  } finally {
    contentLoading.value = false
  }
}

function selectIncident(name: string) {
  loadIncidentContent(name)
}

function goBack() {
  selectedIncident.value = null
}

function formatDate(dateStr: string): string {
  return new Date(dateStr + 'T00:00:00').toLocaleDateString('de-DE', {
    year: 'numeric', month: 'short', day: 'numeric',
  })
}

function formatSize(bytes: number): string {
  if (bytes < 1024) return `${bytes} B`
  if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(1)} KB`
  return `${(bytes / (1024 * 1024)).toFixed(1)} MB`
}

onMounted(loadIncidents)
</script>

<template>
  <div class="page-heading">
    <div>
      <span class="eyebrow">OPERATIONS</span>
      <h1>Incidents</h1>
      <p>Post-mortem reports and operational incidents across Noveria.</p>
    </div>
  </div>

  <div class="incident-layout">
    <!-- Left column: incident list -->
    <aside class="incident-sidebar">
      <template v-if="loading">
        <div class="incident-status">
          <Loader2 :size="16" class="spin" />
          Loading incidents...
        </div>
      </template>
      <template v-else-if="error">
        <div class="incident-status error">{{ error }}</div>
      </template>
      <template v-else-if="sortedIncidents.length">
        <div class="incident-list-header">{{ sortedIncidents.length }} reports</div>
        <button
          v-for="inc in sortedIncidents"
          :key="inc.name"
          :class="['incident-file-item', { active: selectedIncident?.name === inc.name }]"
          @click="selectIncident(inc.name)"
        >
          <div class="incident-file-icon" :class="severityClass(inc.severity)">
            <component :is="severityIcon(inc.severity)" :size="14" />
          </div>
          <div class="incident-file-info">
            <strong>{{ inc.title }}</strong>
            <span class="incident-file-meta">
              <Clock :size="10" />
              {{ inc.date ? formatDate(inc.date) : 'Unknown date' }}
              <span :class="['severity-badge', severityClass(inc.severity)]">{{ inc.severity }}</span>
            </span>
            <span class="incident-file-excerpt">{{ inc.excerpt }}</span>
          </div>
        </button>
      </template>
      <div v-else class="incident-status">No incidents recorded</div>
    </aside>

    <!-- Right column: detail view -->
    <main class="incident-content">
      <template v-if="contentLoading">
        <div class="incident-status">
          <Loader2 :size="20" class="spin" />
          Loading incident...
        </div>
      </template>
      <template v-else-if="selectedIncident">
        <header class="incident-content-header">
          <button class="incident-back-btn" @click="goBack">
            <ArrowLeft :size="14" />
            Back
          </button>
          <div>
            <div class="incident-content-title-row">
              <strong>{{ selectedIncident.title }}</strong>
              <span :class="['severity-badge', severityClass(selectedIncident.severity)]">{{ selectedIncident.severity }}</span>
            </div>
            <span class="incident-content-meta">
              <Clock :size="10" />
              {{ selectedIncident.date ? formatDate(selectedIncident.date) : 'Unknown date' }}
              · {{ formatSize(selectedIncident.size) }}
            </span>
          </div>
        </header>
        <article
          class="incident-rendered"
          v-html="renderMarkdown(selectedIncident.content)"
        ></article>
      </template>
      <template v-else>
        <div class="incident-empty-state">
          <AlertTriangle :size="28" />
          <h3>Select an incident report</h3>
          <p>Choose a report from the list to view its post-mortem details.</p>
        </div>
      </template>
    </main>
  </div>
</template>

<style scoped>
.incident-layout {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 12px;
  min-height: 480px;
}
.incident-sidebar {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  padding: 8px;
  max-height: 640px;
  overflow-y: auto;
}
.incident-list-header {
  font-size: 9px;
  font-weight: 700;
  color: var(--a-mid);
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 10px 8px 6px;
}
.incident-file-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  width: 100%;
  padding: 10px;
  border: none;
  border-radius: 7px;
  background: transparent;
  color: var(--tx);
  text-align: left;
  cursor: pointer;
  font: inherit;
}
.incident-file-item:hover,
.incident-file-item.active {
  background: var(--accent-soft);
}
.incident-file-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: grid;
  place-items: center;
  border-radius: 6px;
}
.incident-file-icon.sev-critical {
  color: var(--st-block);
  background: rgba(231, 76, 60, 0.12);
}
.incident-file-icon.sev-major {
  color: var(--st-queue);
  background: rgba(230, 126, 34, 0.12);
}
.incident-file-icon.sev-minor {
  color: var(--st-queue);
  background: rgba(241, 196, 15, 0.12);
}
.incident-file-icon.sev-unknown {
  color: var(--tx-3);
  background: rgba(126, 135, 153, 0.12);
}
.incident-file-info strong {
  display: block;
  font-size: 11px;
  margin-bottom: 3px;
  word-break: break-word;
}
.incident-file-meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  color: var(--tx-3);
  margin-bottom: 4px;
}
.incident-file-excerpt {
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  font-size: 9px;
  color: var(--tx-3);
  line-height: 1.5;
}
.severity-badge {
  font-size: 8px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 2px 6px;
  border-radius: 4px;
}
.severity-badge.sev-critical {
  background: rgba(231, 76, 60, 0.15);
  color: var(--st-block);
}
.severity-badge.sev-major {
  background: rgba(230, 126, 34, 0.15);
  color: var(--st-queue);
}
.severity-badge.sev-minor {
  background: rgba(241, 196, 15, 0.15);
  color: var(--st-queue);
}
.severity-badge.sev-unknown {
  background: rgba(126, 135, 153, 0.15);
  color: var(--tx-3);
}
.incident-content {
  border: 1px solid var(--line);
  border-radius: var(--r);
  background: var(--panel);
  padding: 24px;
  min-height: 480px;
  overflow-y: auto;
}
.incident-content-header {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 20px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.incident-content-title-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 3px;
}
.incident-content-title-row strong {
  font-size: 13px;
}
.incident-content-meta {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 9px;
  color: var(--tx-3);
}
.incident-back-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: transparent;
  color: var(--tx-2);
  font-size: 10px;
  cursor: pointer;
  flex-shrink: 0;
}
.incident-back-btn:hover {
  color: var(--tx);
  background: var(--accent-soft);
}
.incident-status {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 32px;
  color: var(--tx-3);
  font-size: 11px;
}
.incident-status.error {
  color: var(--st-block);
}
.incident-empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  min-height: 360px;
  color: var(--tx-3);
}
.incident-empty-state h3 {
  margin: 12px 0 6px;
  font-size: 14px;
  color: var(--tx-2);
}
.incident-empty-state p {
  margin: 0;
  font-size: 10px;
  color: var(--tx-3);
}
.incident-rendered {
  font-size: 12px;
  line-height: 1.7;
  color: var(--tx-2);
}
.incident-rendered :deep(h1),
.incident-rendered :deep(h2),
.incident-rendered :deep(h3) {
  color: var(--tx);
  margin: 1.2em 0 0.5em;
}
.incident-rendered :deep(h1) { font-size: 1.3rem; }
.incident-rendered :deep(h2) { font-size: 1.1rem; }
.incident-rendered :deep(h3) { font-size: 1rem; }
.incident-rendered :deep(p) { margin: 0.6em 0; }
.incident-rendered :deep(code) {
  padding: 2px 5px;
  background: rgba(139,124,246,.08);
  border-radius: 4px;
  font-size: 11px;
}
.incident-rendered :deep(pre) {
  padding: 12px;
  border-radius: 8px;
  background: var(--space-2);
  border: 1px solid var(--line);
  overflow-x: auto;
}
.incident-rendered :deep(pre code) {
  background: none;
  padding: 0;
}
.incident-rendered :deep(a) {
  color: var(--a-mid);
  text-decoration: none;
}
.incident-rendered :deep(a:hover) {
  text-decoration: underline;
}
.incident-rendered :deep(ul) {
  padding-left: 20px;
}
.incident-rendered :deep(li) {
  margin: 0.3em 0;
}
.incident-rendered :deep(hr) {
  border: none;
  border-top: 1px solid var(--line);
  margin: 1.2em 0;
}
.incident-rendered :deep(strong) {
  color: var(--tx);
}
.spin {
  animation: spin 1s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

@media (max-width: 900px) {
  .incident-layout {
    grid-template-columns: 1fr;
  }
  .incident-sidebar {
    max-height: 280px;
  }
}
</style>
