<script lang="ts">
  import { onMount } from 'svelte'
  import { fetchSignals, ackSignal, resolveSignal, muteSignal, type Signal } from '$lib/api'
  import { liveEvents, subscribeEvents } from '$lib/stores/events'
  import * as Tabs from '$lib/components/ui/tabs'
  import { Badge } from '$lib/components/ui/badge'
  import * as Select from '$lib/components/ui/select'
  import { toast } from 'svelte-sonner'
  import DataTable from '$lib/components/data-table/DataTable.svelte'
  import type { DataTableColumn } from '$lib/components/data-table/types'
  import SignalActions from '$lib/components/data-table/renderers/SignalActions.svelte'

  let signals = $state<Signal[]>([])
  let severityFilter = $state('all')
  let acting = $state<string | null>(null)

  async function load() {
    signals = await fetchSignals()
  }

  onMount(() => {
    load()
    const unsubscribe = subscribeEvents()
    return unsubscribe
  })

  $effect(() => {
    const ev = $liveEvents[0]
    if (!ev || !ev.type.startsWith('signal.')) return
    load()
  })

  async function ack(id: string) {
    acting = id
    const result = await ackSignal(id)
    acting = null
    if (result) {
      toast.success('Signal acknowledged')
      load()
    } else {
      toast.error('Acknowledge failed')
    }
  }

  async function resolve(id: string) {
    acting = id
    const result = await resolveSignal(id)
    acting = null
    if (result) {
      toast.success('Signal resolved')
      load()
    } else {
      toast.error('Resolve failed')
    }
  }

  async function mute(id: string) {
    acting = id
    const muteUntil = new Date(Date.now() + 60 * 60 * 1000).toISOString()
    const result = await muteSignal(id, muteUntil)
    acting = null
    if (result) {
      toast.success('Signal muted for 1h')
      load()
    } else {
      toast.error('Mute failed')
    }
  }

  function bySeverity(list: Signal[]) {
    return severityFilter === 'all' ? list : list.filter((s) => s.severity === severityFilter)
  }

  const open = $derived(bySeverity(signals.filter((s) => ['raised', 'acknowledged', 'acting'].includes(s.state))))
  const muted = $derived(bySeverity(signals.filter((s) => s.state === 'muted')))
  const resolved = $derived(bySeverity(signals.filter((s) => ['resolved', 'failed'].includes(s.state))))

  function makeColumns(showActions: boolean, actingVal: string | null): DataTableColumn<Signal>[] {
    const base: DataTableColumn<Signal>[] = [
      { key: 'target', header: 'Target', class: 'font-mono text-xs', width: '180px', accessor: (s) => s.target ?? '—', truncate: true },
      { key: 'kind', header: 'Kind', width: '120px' },
      { key: 'severity', header: 'Severity', render: 'status-badge', renderProps: { kind: 'severity' }, width: '100px' },
      { key: 'state', header: 'State', render: 'status-badge', renderProps: { kind: 'state' }, width: '110px' },
      { key: 'occurrence_count', header: 'Occurrences', width: '100px', align: 'right' },
      { key: 'last_seen_at', header: 'Last seen', render: 'date', width: '170px' },
    ]
    if (showActions) {
      base.push({
        key: '_actions', header: '', render: SignalActions,
        renderProps: { acting: actingVal, onAck: ack, onMute: mute, onResolve: resolve },
        align: 'right', headerClass: 'text-right', width: '220px'
      })
    }
    return base
  }

  const columnsWithActions = $derived(makeColumns(true, acting))
  const columnsWithoutActions = makeColumns(false, null)
</script>

<div class="flex h-full flex-col gap-4 p-4 md:p-6">
  <div class="flex items-center justify-between">
    <h1 class="text-lg font-semibold">Signals</h1>
    <Select.Root type="single" bind:value={severityFilter}>
      <Select.Trigger class="w-40">
        {severityFilter === 'all' ? 'All severities' : severityFilter}
      </Select.Trigger>
      <Select.Content>
        <Select.Item value="all">All severities</Select.Item>
        <Select.Item value="critical">Critical</Select.Item>
        <Select.Item value="warning">Warning</Select.Item>
        <Select.Item value="info">Info</Select.Item>
      </Select.Content>
    </Select.Root>
  </div>

  <Tabs.Root value="open" class="flex flex-1 flex-col overflow-hidden">
    <Tabs.List>
      <Tabs.Trigger value="open">
        Open {#if open.length}<Badge variant="destructive" class="ml-1">{open.length}</Badge>{/if}
      </Tabs.Trigger>
      <Tabs.Trigger value="muted">Muted</Tabs.Trigger>
      <Tabs.Trigger value="resolved">Resolved</Tabs.Trigger>
    </Tabs.List>
    <Tabs.Content value="open" class="flex-1 overflow-auto">
      <DataTable columns={columnsWithActions} data={open} />
    </Tabs.Content>
    <Tabs.Content value="muted" class="flex-1 overflow-auto">
      <DataTable columns={columnsWithActions} data={muted} />
    </Tabs.Content>
    <Tabs.Content value="resolved" class="flex-1 overflow-auto">
      <DataTable columns={columnsWithoutActions} data={resolved} />
    </Tabs.Content>
  </Tabs.Root>
</div>
