<script lang="ts">
  import { SvelteMap } from "svelte/reactivity";
  import { invoke } from "@tauri-apps/api/core";
  import { claudeStore } from "$lib/stores/claude";
  import { agentStore, getAgentsForConversation } from "$lib/stores/agents";
  import type { AgentInfo } from "$lib/types/agents";
  import { onMount, onDestroy } from "svelte";

  interface Props {
    isOpen: boolean;
    onClose: () => void;
  }

  const { isOpen, onClose }: Props = $props();

  let now = $state(Date.now());
  let timerInterval: ReturnType<typeof setInterval> | null = null;

  // We need a reactive subscription to agents for the active conversation
  let agents: AgentInfo[] = $state([]);
  let agentsUnsubscribe: (() => void) | null = null;

  // Track active conversation reactively
  let currentConversationId = $state<string | null>("");
  const conversationIdUnsubscribe = claudeStore.activeConversationId.subscribe((id) => {
    currentConversationId = id;
  });

  $effect(() => {
    // Re-subscribe when conversation changes
    if (agentsUnsubscribe) {
      agentsUnsubscribe();
    }
    if (currentConversationId) {
      const store = getAgentsForConversation(currentConversationId);
      agentsUnsubscribe = store.subscribe((value) => {
        agents = value;
      });
    } else {
      agents = [];
    }
  });

  const runningAgents = $derived(agents.filter((a) => a.status === "running"));
  const completedAgents = $derived(agents.filter((a) => a.status === "completed"));
  const erroredAgents = $derived(agents.filter((a) => a.status === "errored"));

  // Organize agents into a tree structure based on parent_tool_use_id
  const agentTree = $derived.by(() => {
    const topLevel = agents.filter((a) => !a.parentToolUseId);
    const childrenMap = new SvelteMap<string, AgentInfo[]>();

    // Group children by their parent
    agents.forEach((agent) => {
      if (agent.parentToolUseId) {
        const siblings = childrenMap.get(agent.parentToolUseId) || [];
        siblings.push(agent);
        childrenMap.set(agent.parentToolUseId, siblings);
      }
    });

    return { topLevel, childrenMap };
  });

  onMount(() => {
    timerInterval = setInterval(() => {
      now = Date.now();
    }, 1000);
  });

  onDestroy(() => {
    if (timerInterval) clearInterval(timerInterval);
    if (agentsUnsubscribe) agentsUnsubscribe();
    conversationIdUnsubscribe();
  });

  function formatDuration(startedAt: number, endedAt?: number): string {
    const end = endedAt || now;
    const durationMs = end - startedAt;
    const seconds = Math.floor(durationMs / 1000);
    const minutes = Math.floor(seconds / 60);
    const hours = Math.floor(minutes / 60);

    if (hours > 0) {
      return `${hours}h ${minutes % 60}m ${seconds % 60}s`;
    }
    if (minutes > 0) {
      return `${minutes}m ${seconds % 60}s`;
    }
    return `${seconds}s`;
  }

  function getSubagentTypeLabel(type: string): string {
    const labels: Record<string, string> = {
      Explore: "Explorer",
      "general-purpose": "General",
      Plan: "Planner",
      Bash: "Shell",
    };
    return labels[type] || type;
  }

  function getStatusBadgeClass(status: string): string {
    switch (status) {
      case "running":
        return "bg-blue-500/20 text-blue-400 border-blue-500/30";
      case "completed":
        return "bg-green-500/20 text-green-400 border-green-500/30";
      case "errored":
        return "bg-red-500/20 text-red-400 border-red-500/30";
      default:
        return "bg-gray-500/20 text-gray-400 border-gray-500/30";
    }
  }

  async function handleKillAll() {
    if (!currentConversationId) return;

    try {
      await invoke("interrupt_claude", { conversationId: currentConversationId });
    } catch (error) {
      console.error("Failed to kill Claude process:", error);
    }
  }

  function handleClearCompleted() {
    if (currentConversationId) {
      agentStore.clearCompleted(currentConversationId);
    }
  }

  // Flatten the tree for rendering with depth information
  const flattenedAgents = $derived.by(() => {
    const result: { agent: AgentInfo; depth: number }[] = [];
    const { topLevel, childrenMap } = agentTree;

    function addAgentAndChildren(agent: AgentInfo, depth: number) {
      result.push({ agent, depth });
      const children = childrenMap.get(agent.toolUseId);
      if (children) {
        children.forEach((child) => addAgentAndChildren(child, depth + 1));
      }
    }

    topLevel.forEach((agent) => addAgentAndChildren(agent, 0));
    return result;
  });
</script>

{#if isOpen}
  <!-- svelte-ignore a11y_click_events_have_key_events -->
  <!-- svelte-ignore a11y_no_static_element_interactions -->
  <div class="fixed inset-0 z-40" onclick={onClose}></div>

  <div
    class="fixed top-12 right-0 bottom-0 w-80 bg-[var(--bg-primary)] border-l border-[var(--border-color)] shadow-xl z-50 flex flex-col overflow-hidden"
  >
    <!-- Header -->
    <div class="flex items-center justify-between p-4 border-b border-[var(--border-color)]">
      <div class="flex items-center gap-2">
        <svg
          class="w-5 h-5 text-[var(--accent-primary)]"
          fill="none"
          stroke="currentColor"
          viewBox="0 0 24 24"
        >
          <path
            stroke-linecap="round"
            stroke-linejoin="round"
            stroke-width="2"
            d="M9 3v2m6-2v2M9 19v2m6-2v2M5 9H3m2 6H3m18-6h-2m2 6h-2M7 19h10a2 2 0 002-2V7a2 2 0 00-2-2H7a2 2 0 00-2 2v10a2 2 0 002 2zM9 9h6v6H9V9z"
          />
        </svg>
        <h3 class="text-sm font-semibold text-[var(--text-primary)]">Agent Monitor</h3>
        {#if runningAgents.length > 0}
          <span
            class="px-1.5 py-0.5 text-xs rounded-full bg-blue-500/20 text-blue-400 animate-pulse"
          >
            {runningAgents.length} running
          </span>
        {/if}
      </div>
      <button
        onclick={onClose}
        class="p-1 text-[var(--text-secondary)] hover:text-[var(--text-primary)] transition-colors"
        aria-label="Close agent monitor"
      >
        <svg class="w-4 h-4" fill="none" stroke="currentColor" viewBox="0 0 24 24">
          <path
            stroke-linecap="round"
            stroke-linejoin="round"
            stroke-width="2"
            d="M6 18L18 6M6 6l12 12"
          />
        </svg>
      </button>
    </div>

    <!-- Action buttons -->
    <div class="flex gap-2 px-4 py-2 border-b border-[var(--border-color)]">
      <button
        onclick={handleKillAll}
        disabled={runningAgents.length === 0}
        class="flex-1 px-2 py-1 text-xs bg-red-500/20 hover:bg-red-500/30 text-red-400 rounded transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
        title="Kills the entire Claude Code process to stop all agents"
      >
        Kill All
      </button>
      <button
        onclick={handleClearCompleted}
        disabled={completedAgents.length === 0 && erroredAgents.length === 0}
        class="flex-1 px-2 py-1 text-xs bg-[var(--bg-secondary)] hover:bg-[var(--bg-hover,var(--bg-secondary))] text-[var(--text-secondary)] rounded transition-colors disabled:opacity-40 disabled:cursor-not-allowed"
      >
        Clear Finished
      </button>
    </div>

    <!-- Agent list -->
    <div class="flex-1 overflow-y-auto p-4 space-y-2">
      {#if agents.length === 0}
        <div
          class="flex flex-col items-center justify-center h-full text-[var(--text-secondary)] text-sm"
        >
          <svg
            class="w-8 h-8 mb-2 opacity-50"
            fill="none"
            stroke="currentColor"
            viewBox="0 0 24 24"
          >
            <path
              stroke-linecap="round"
              stroke-linejoin="round"
              stroke-width="2"
              d="M9 3v2m6-2v2M9 19v2m6-2v2M5 9H3m2 6H3m18-6h-2m2 6h-2M7 19h10a2 2 0 002-2V7a2 2 0 00-2-2H7a2 2 0 00-2 2v10a2 2 0 002 2zM9 9h6v6H9V9z"
            />
          </svg>
          <p>No agents detected yet</p>
          <p class="text-xs mt-1 opacity-70">
            Agents will appear here when Claude uses the Task tool
          </p>
        </div>
      {:else}
        {#each flattenedAgents as { agent, depth } (agent.toolUseId)}
          <div
            class="p-3 rounded-lg border border-[var(--border-color)] bg-[var(--bg-secondary)] {agent.status ===
            'running'
              ? 'border-l-2 border-l-blue-500'
              : agent.status === 'errored'
                ? 'border-l-2 border-l-red-500'
                : 'border-l-2 border-l-green-500'}"
            style="margin-left: {depth * 12}px; width: calc(100% - {depth * 12}px);"
          >
            <!-- Agent header -->
            <div class="flex items-center justify-between mb-1">
              <div class="flex items-center gap-1.5">
                {#if depth > 0}
                  <svg
                    class="w-3 h-3 text-[var(--text-secondary)]"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      stroke-linecap="round"
                      stroke-linejoin="round"
                      stroke-width="2"
                      d="M9 5l7 7-7 7"
                    />
                  </svg>
                {/if}
                <span
                  class="px-1.5 py-0.5 text-[10px] rounded border {getStatusBadgeClass(
                    agent.status
                  )}"
                >
                  {getSubagentTypeLabel(agent.subagentType)}
                </span>
              </div>
              <span
                class="text-[10px] {agent.status === 'running'
                  ? 'text-blue-400'
                  : 'text-[var(--text-secondary)]'}"
              >
                {#if agent.durationMs !== undefined}
                  {Math.floor(agent.durationMs / 1000)}s
                {:else}
                  {formatDuration(agent.startedAt, agent.endedAt)}
                {/if}
                {#if agent.status === "running"}
                  <span class="inline-block w-1 h-1 bg-blue-400 rounded-full animate-pulse ml-1"
                  ></span>
                {/if}
              </span>
            </div>

            <!-- Agent description -->
            <p class="text-xs text-[var(--text-primary)] truncate" title={agent.description}>
              {agent.description}
            </p>

            <!-- Status indicator -->
            <div class="mt-1 flex items-center gap-1">
              {#if agent.status === "running"}
                <span class="text-[10px] text-blue-400">Running...</span>
              {:else if agent.status === "completed"}
                <span class="text-[10px] text-green-400">Completed</span>
              {:else}
                <span class="text-[10px] text-red-400">Errored / Killed</span>
              {/if}
            </div>
          </div>
        {/each}
      {/if}
    </div>

    <!-- Footer summary -->
    {#if agents.length > 0}
      <div
        class="px-4 py-2 border-t border-[var(--border-color)] text-[10px] text-[var(--text-secondary)]"
      >
        {agents.length} total &middot;
        {runningAgents.length} running &middot;
        {completedAgents.length} completed &middot;
        {erroredAgents.length} errored
      </div>
    {/if}
  </div>
{/if}
