<script lang="ts">
  // One tool call inside AgentTrace's expanded list. Renders as a borderless
  // row (the trace supplies the container/border) whose own click reveals the
  // raw args/result — so the trace stays a readable thinking log by default
  // and the JSON is one more click away, not stacked inline.
  import { Check, ChevronRight, Loader2, X } from '@lucide/svelte'
  import type { ToolCallResult } from '$lib/types'
  import { toolActivityLabel } from '$lib/stores/activity'

  let { tool }: { tool: ToolCallResult } = $props()
  let expanded = $state(false)

  const status = $derived.by(() => {
    if (tool.type === 'tool_use') return 'running'
    if (tool.error) return 'error'
    return 'done'
  })

  const label = $derived(toolActivityLabel(tool))

  const argsSummary = $derived.by(() => {
    if (!tool.args) return ''
    const entries = Object.entries(tool.args)
    if (entries.length === 0) return ''
    const first = entries[0]
    const val = typeof first[1] === 'string' ? first[1] : JSON.stringify(first[1])
    return `${first[0]}: ${val.length > 60 ? val.slice(0, 60) + '…' : val}`
  })

  const hasDetail = $derived(
    !!tool.args || (tool.result !== undefined && tool.result !== null) || !!tool.error
  )
</script>

<div class="tool-row">
  <button
    class="flex w-full items-start gap-2 rounded-md px-2 py-1.5 text-left transition-colors hover:bg-muted/40 disabled:cursor-default"
    onclick={() => (expanded = !expanded)}
    aria-expanded={expanded}
    disabled={!hasDetail}
  >
    <span class="mt-px shrink-0 {status === 'error' ? 'text-destructive' : 'text-primary'}">
      {#if status === 'running'}
        <Loader2 class="size-3 animate-spin" />
      {:else if status === 'error'}
        <X class="size-3" />
      {:else}
        <Check class="size-3" />
      {/if}
    </span>
    <span class="min-w-0 flex-1">
      <span class="block truncate text-xs text-foreground/90">{label}</span>
      {#if argsSummary}
        <span class="block truncate font-mono text-[10px] text-muted-foreground/60"
          >{argsSummary}</span
        >
      {/if}
    </span>
    <span class="shrink-0 font-mono text-[10px] text-muted-foreground/50">{tool.name}</span>
    {#if hasDetail}
      <ChevronRight
        class="mt-px size-3 shrink-0 text-muted-foreground/50 transition-transform {expanded
          ? 'rotate-90'
          : ''}"
      />
    {/if}
  </button>

  {#if expanded}
    <div class="space-y-2 px-2 pb-2 pl-7">
      {#if tool.args}
        <div>
          <div
            class="mb-1 text-[10px] font-semibold uppercase tracking-wider text-muted-foreground"
          >
            Args
          </div>
          <pre
            class="max-h-48 overflow-x-auto rounded-md bg-muted/60 p-2 text-[11px]">{JSON.stringify(
              tool.args,
              null,
              2
            )}</pre>
        </div>
      {/if}
      {#if tool.result !== undefined && tool.result !== null}
        <div>
          <div
            class="mb-1 text-[10px] font-semibold uppercase tracking-wider text-muted-foreground"
          >
            Result
          </div>
          <pre
            class="max-h-48 overflow-x-auto rounded-md bg-muted/60 p-2 text-[11px]">{JSON.stringify(
              tool.result,
              null,
              2
            )}</pre>
        </div>
      {/if}
      {#if tool.error}
        <div>
          <div class="mb-1 text-[10px] font-semibold uppercase tracking-wider text-destructive">
            Error
          </div>
          <pre
            class="max-h-48 overflow-x-auto rounded-md border border-destructive/20 bg-destructive/5 p-2 text-[11px] text-destructive">{tool.error}</pre>
        </div>
      {/if}
    </div>
  {/if}
</div>
