"use client";

import Link from "next/link";
import { useEffect, useState } from "react";
import { useParams } from "next/navigation";
import { AppShell } from "@/components/AppShell";
import { NoteEditor } from "@/components/NoteEditor";
import { MetadataPanel } from "@/components/MetadataPanel";
import { LinkedNotesPanel } from "@/components/LinkedNotesPanel";
import { TaskReviewPanel } from "@/components/TaskReviewPanel";
import { ArtifactPanel } from "@/components/ArtifactPanel";
import { AgentTimeline } from "@/components/AgentTimeline";
import { LinkNoteModal } from "@/components/LinkNoteModal";
import { archiveNote, createNoteArtifact, createNoteTask, getNoteDetail, restoreNote, summarizeNote, updateNoteDetail } from "@/lib/notes-client";
import type { NoteDetail } from "@/lib/types";

export default function NoteDetailPage() {
  const params = useParams<{ noteId: string }>();
  const noteId = params.noteId;
  const [note, setNote] = useState<NoteDetail | null>(null);
  const [isSaving, setIsSaving] = useState(false);
  const [isCreatingTask, setIsCreatingTask] = useState(false);
  const [isCreatingArtifact, setIsCreatingArtifact] = useState(false);
  const [error, setError] = useState<string | null>(null);
  const [showLinkNote, setShowLinkNote] = useState(false);

  useEffect(() => {
    void (async () => {
      try {
        setNote(await getNoteDetail(noteId));
      } catch (err) {
        setError(err instanceof Error ? err.message : "Unable to load note");
      }
    })();
  }, [noteId]);

  async function handleSave(updates: { title: string; body: string }) {
    if (!note) {
      return;
    }

    setIsSaving(true);

    try {
      await updateNoteDetail(note.id, note.workspaceId, updates);
      const refreshed = await getNoteDetail(note.id);
      setNote(refreshed);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to save note");
    } finally {
      setIsSaving(false);
    }
  }

  async function handleCreateArtifact(input: {
    title: string;
    artifactType: "file" | "summary" | "extraction" | "citation" | "export";
    description?: string;
    blobPath?: string;
  }) {
    if (!note) {
      return;
    }

    setIsCreatingArtifact(true);

    try {
      await createNoteArtifact({
        id: crypto.randomUUID(),
        workspaceId: note.workspaceId,
        noteId: note.id,
        artifactType: input.artifactType,
        title: input.title,
        description: input.description,
        blobPath: input.blobPath,
      });
      const refreshed = await getNoteDetail(note.id);
      setNote(refreshed);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to create artifact");
    } finally {
      setIsCreatingArtifact(false);
    }
  }

  async function handleCreateTask(input: { title: string; description?: string }) {
    if (!note) {
      return;
    }

    setIsCreatingTask(true);

    try {
      await createNoteTask({
        id: crypto.randomUUID(),
        workspaceId: note.workspaceId,
        noteId: note.id,
        title: input.title,
        description: input.description,
        source: "manual",
      });
      const refreshed = await getNoteDetail(note.id);
      setNote(refreshed);
      setError(null);
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to create task");
    } finally {
      setIsCreatingTask(false);
    }
  }

  async function handleSummarize() {
    if (!note) return;
    try {
      await summarizeNote(note.id, note.workspaceId);
      setNote(await getNoteDetail(note.id, note.workspaceId));
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to summarize note");
    }
  }

  async function handleArchive() {
    if (!note) return;
    try {
      await archiveNote(note.id, note.workspaceId);
      setNote(await getNoteDetail(note.id, note.workspaceId));
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to archive note");
    }
  }

  async function handleRestore() {
    if (!note) return;
    try {
      await restoreNote(note.id, note.workspaceId);
      setNote(await getNoteDetail(note.id, note.workspaceId));
    } catch (err) {
      setError(err instanceof Error ? err.message : "Unable to restore note");
    }
  }

  if (!note) {
    return (
      <AppShell
        title="Note detail"
        description="Editable note surface with metadata, linked context, tasks, artifacts, and review history."
        actions={<div className="badge">Loading</div>}
      >
        <section className="surface-card" style={{ padding: "var(--ml-space-6)", color: "var(--ml-text-secondary)" }}>
          {error ?? "Loading note…"}
        </section>
      </AppShell>
    );
  }

  return (
    <AppShell
      title={note.title}
      description="Editable note surface with metadata, linked context, tasks, artifacts, and review history."
      actions={
        <div style={{ display: "flex", gap: "var(--ml-space-2)", alignItems: "center" }}>
          {isSaving ? (
            <div className="badge">Saving</div>
          ) : (
            <Link href="/reviews" className="badge">
              {`Review: ${note.metadata.reviewState}`}
            </Link>
          )}
          <button className="btn btn-secondary" onClick={handleSummarize}>
            Summarize
          </button>
          <button className="btn btn-secondary" onClick={() => setShowLinkNote(true)}>
            Link Note
          </button>
          {note.status === "archived" ? (
            <button className="btn btn-primary" onClick={handleRestore}>Restore</button>
          ) : (
            <button className="btn btn-secondary" onClick={handleArchive}>Archive</button>
          )}
        </div>
      }
    >
      <div style={{ display: "grid", gridTemplateColumns: "minmax(0, 1.7fr) minmax(320px, 1fr)", gap: "var(--ml-space-4)" }}>
        <NoteEditor note={note} onSave={handleSave} isSaving={isSaving} />

        <aside style={{ display: "grid", gap: "var(--ml-space-4)" }}>
          {error ? <div className="surface-card" style={{ padding: "var(--ml-space-4)", color: "var(--ml-text-secondary)" }}>{error}</div> : null}
          <MetadataPanel note={note} />
          <LinkedNotesPanel linkedNotes={note.linkedNotes} />
          <TaskReviewPanel tasks={note.tasks} onCreate={handleCreateTask} isCreating={isCreatingTask} />
          <ArtifactPanel artifacts={note.artifacts} onCreate={handleCreateArtifact} isCreating={isCreatingArtifact} />
          <AgentTimeline items={note.timeline} />
        </aside>
      </div>
      {showLinkNote && (
        <LinkNoteModal
          noteId={note.id}
          workspaceId={note.workspaceId}
          existingLinkedIds={note.linkedNotes.map((ln) => ln.id)}
          onLinked={() => {
            setShowLinkNote(false);
            void getNoteDetail(note.id, note.workspaceId).then(setNote);
          }}
          onClose={() => setShowLinkNote(false)}
        />
      )}
    </AppShell>
  );
}