import sharp from 'sharp';
import type { ImageWithAnnotations, Note, NoteDetail, ReviewStatus, WorkFeedbackBundle, WorkRound } from '../../shared/types.js';
import { notesRepository } from '../repositories/notesRepository.js';
import { imagesRepository } from '../repositories/imagesRepository.js';
import { annotationsRepository } from '../repositories/annotationsRepository.js';
import { database, databaseDialect, withTransaction, type QueryContext } from '../database.js';
import { storeExternalImageUrl, storeUploadedFile } from '../storage.js';
import { recalculateCollectionStatus } from './collectionsService.js';
import { ensureProjectCompatibilityCollection, recalculateProjectReviewStatus } from './projectsService.js';

export interface UploadedFile { filename: string; originalname?: string; mimetype?: string; path: string }
export interface UploadRound { title: string; description: string; tags: string[]; files: UploadedFile[] }
export interface UrlRound { title: string; description: string; tags: string[]; images: string[] }

type StoredImage = { url: string; width: number; height: number; storageProvider: 'local' | 'tencent_cos' | 'external'; storageKey: string };
type PreparedRound = { title: string; description: string; tags: string[]; images: StoredImage[] };

async function readImageSize(filePath: string): Promise<{ width: number; height: number }> {
  try { const meta = await sharp(filePath).metadata(); return { width: meta.width ?? 0, height: meta.height ?? 0 }; }
  catch { return { width: 0, height: 0 }; }
}

async function prepareFiles(files: UploadedFile[]): Promise<StoredImage[]> {
  return Promise.all(files.map(async (file) => ({ ...(await readImageSize(file.path)), ...(await storeUploadedFile(file)) })));
}

async function prepareExternalImages(images: string[]): Promise<StoredImage[]> {
  const prepared: StoredImage[] = [];
  for (const image of images) prepared.push(await storeExternalImageUrl(image));
  return prepared;
}

async function createRoundInTransaction(
  tx: QueryContext,
  noteId: number,
  projectId: number,
  collectionId: number,
  round: PreparedRound,
  createdBy: number | undefined,
  fromStatus: ReviewStatus,
): Promise<{ roundId: number; roundNumber: number; versionNumber: number }> {
  const note = await tx.one<{ active_round_id: number | null }>(
    `SELECT active_round_id FROM notes WHERE id = ?${databaseDialect === 'postgres' ? ' FOR NO KEY UPDATE' : ''}`,
    [noteId],
  );
  if (note?.active_round_id) {
    await tx.execute("UPDATE work_versions SET candidate_status = 'not_selected', review_status = 'draft' WHERE review_round_id = ? AND review_status != 'approved'", [note.active_round_id]);
    await tx.execute("UPDATE review_rounds SET status = 'completed', completion_reason = 'superseded', completed_at = COALESCE(completed_at, ?) WHERE id = ? AND status IN ('draft', 'reviewing')", [new Date().toISOString(), note.active_round_id]);
  }

  const maxima = await tx.one<{ max_version: number | string | null; max_round: number | string | null }>(
    `SELECT (SELECT MAX(version_number) FROM work_versions WHERE note_id = ?) AS max_version,
      (SELECT MAX(round_number) FROM review_rounds WHERE note_id = ?) AS max_round`,
    [noteId, noteId],
  );
  const versionNumber = Number(maxima?.max_version ?? 0) + 1;
  const roundNumber = Number(maxima?.max_round ?? 0) + 1;
  const roundId = await tx.insertId(
    "INSERT INTO review_rounds (note_id, round_number, status, created_by) VALUES (?, ?, 'reviewing', ?)",
    [noteId, roundNumber, createdBy ?? null],
  );
  await tx.execute(
    "INSERT INTO work_versions (note_id, version_number, title, description, tags, review_status, review_round_id, candidate_name, candidate_status, created_by) VALUES (?, ?, ?, ?, ?, 'pending', ?, '', 'pending', ?)",
    [noteId, versionNumber, round.title, round.description, JSON.stringify(round.tags), roundId, createdBy ?? null],
  );
  await imagesRepository.createMany(noteId, round.images, versionNumber, tx);
  await tx.execute(
    "INSERT INTO review_events (note_id, version_number, event_type, from_status, to_status, actor_name, actor_role) VALUES (?, ?, 'submitted', ?, 'pending', ?, 'operator')",
    [noteId, versionNumber, fromStatus, '工作台'],
  );
  await tx.execute(
    "UPDATE notes SET title = ?, description = ?, tags = ?, version_number = ?, active_round_id = ?, approved_version_number = NULL, review_status = 'pending' WHERE id = ?",
    [round.title, round.description, JSON.stringify(round.tags), versionNumber, roundId, noteId],
  );
  await recalculateCollectionStatus(collectionId, tx);
  await recalculateProjectReviewStatus(projectId, tx);
  return { roundId, roundNumber, versionNumber };
}

async function prepareUploadRound(round: UploadRound): Promise<PreparedRound> {
  return { title: round.title, description: round.description, tags: round.tags, images: await prepareFiles(round.files) };
}

function mapRound(row: Omit<WorkRound, 'tags'> & { tags: string }): WorkRound {
  return {
    ...row,
    version_number: Number(row.version_number),
    review_round_id: Number(row.review_round_id),
    round_number: Number(row.round_number),
    tags: JSON.parse(row.tags || '[]') as string[],
  };
}

export const notesService = {
  async list(query: { sort?: string; order?: string; q?: string; collectionId?: number; status?: ReviewStatus; tag?: string; projectId?: number; groupId?: number; externalId?: string }) {
    return notesRepository.list({ sort: query.sort === 'annotations' ? 'annotations' : 'created_at', order: query.order === 'asc' ? 'asc' : 'desc', q: query.q, collectionId: query.collectionId, status: query.status, tag: query.tag, projectId: query.projectId, groupId: query.groupId, externalId: query.externalId });
  },

  async getDetail(id: number, requestedVersion?: number, requestedRound?: number): Promise<NoteDetail | null> {
    const current = await notesRepository.findById(id);
    if (!current) return null;
    const requested = requestedRound
      ? await database.one<{ version_number: number }>('SELECT v.version_number FROM work_versions v JOIN review_rounds r ON r.id = v.review_round_id WHERE v.note_id = ? AND r.round_number = ?', [id, requestedRound])
      : undefined;
    const targetVersion = requested ? Number(requested.version_number) : requestedVersion;
    const selectedVersion = targetVersion && targetVersion !== current.version_number
      ? await database.one<{ version_number: number; title: string; description: string; tags: string; review_status: ReviewStatus }>('SELECT version_number, title, description, tags, review_status FROM work_versions WHERE note_id = ? AND version_number = ?', [id, targetVersion])
      : undefined;
    if (targetVersion && targetVersion !== current.version_number && !selectedVersion) return null;
    const note: Note = selectedVersion ? { ...current, ...selectedVersion, version_number: Number(selectedVersion.version_number), tags: JSON.parse(selectedVersion.tags || '[]') as string[] } : current;
    const images = await imagesRepository.listByNote(id, note.version_number);
    const project = await database.one<{ id: number; name: string; slug: string; status: NoteDetail['project']['status']; review_status: NoteDetail['project']['review_status'] }>('SELECT p.id, p.name, p.slug, p.status, p.review_status FROM notes n JOIN projects p ON p.id = n.project_id WHERE n.id = ?', [id]);
    if (!project) return null;
    const roundRows = await database.all<Array<Omit<WorkRound, 'tags'> & { tags: string }>[number]>(`SELECT v.version_number, v.title, v.description, v.tags, v.review_status, v.review_round_id,
      v.created_at, r.round_number, r.status AS round_status, r.completion_reason
      FROM work_versions v JOIN review_rounds r ON r.id = v.review_round_id
      WHERE v.note_id = ? ORDER BY r.round_number DESC`, [id]);
    const result: NoteDetail = {
      ...note,
      images: [] as ImageWithAnnotations[],
      text_annotations: await database.all<NoteDetail['text_annotations'][number]>('SELECT * FROM text_annotations WHERE note_id = ? AND version_number = ? ORDER BY id ASC', [id, note.version_number]),
      comments: await database.all<NoteDetail['comments'][number]>('SELECT * FROM work_comments WHERE note_id = ? AND version_number = ? ORDER BY id ASC', [id, note.version_number]),
      feedback_replies: await database.all<NoteDetail['feedback_replies'][number]>('SELECT * FROM feedback_replies WHERE note_id = ? AND version_number = ? ORDER BY id ASC', [id, note.version_number]),
      rounds: roundRows.map(mapRound),
      review_events: await database.all<NoteDetail['review_events'][number]>('SELECT * FROM review_events WHERE note_id = ? AND version_number = ? ORDER BY id DESC', [id, note.version_number]),
      project: { id: Number(project.id), name: project.name, slug: project.slug, status: project.status, review_status: project.review_status },
    };
    for (const image of images) result.images.push({ ...image, annotations: await annotationsRepository.listByImage(image.id) });
    return result;
  },

  async createInProject(projectId: number, title: string, description: string, files: UploadedFile[], tags: string[], externalId: string | null = null): Promise<Note> {
    const prepared = await prepareFiles(files);
    return withTransaction(async (tx) => {
      const collectionId = await ensureProjectCompatibilityCollection(projectId, tx);
      const id = await tx.insertId("INSERT INTO notes (project_id, collection_id, external_id, title, description, tags, review_status) VALUES (?, ?, ?, ?, ?, ?, 'pending')", [projectId, collectionId, externalId, title, description, JSON.stringify(tags)]);
      await createRoundInTransaction(tx, id, projectId, collectionId, { title, description, tags, images: prepared }, undefined, 'draft');
      return (await notesRepository.findById(id))!;
    });
  },

  async createInProjectFromUrls(projectId: number, title: string, description: string, imageUrls: string[], tags: string[], externalId: string | null = null): Promise<Note> {
    const prepared = await prepareExternalImages(imageUrls);
    return withTransaction(async (tx) => {
      const collectionId = await ensureProjectCompatibilityCollection(projectId, tx);
      const id = await tx.insertId("INSERT INTO notes (project_id, collection_id, external_id, title, description, tags, review_status) VALUES (?, ?, ?, ?, ?, ?, 'pending')", [projectId, collectionId, externalId, title, description, JSON.stringify(tags)]);
      await createRoundInTransaction(tx, id, projectId, collectionId, { title, description, tags, images: prepared }, undefined, 'draft');
      return (await notesRepository.findById(id))!;
    });
  },

  async create(title: string, description: string, files: UploadedFile[], collectionId: number, tags: string[], externalId: string | null = null): Promise<Note> {
    const collection = await database.one<{ project_id: number }>('SELECT project_id FROM collections WHERE id = ?', [collectionId]);
    if (!collection) throw new Error('作品交付集不存在');
    const projectId = Number(collection.project_id);
    const prepared = await prepareFiles(files);
    return withTransaction(async (tx) => {
      const id = await tx.insertId("INSERT INTO notes (project_id, collection_id, external_id, title, description, tags, review_status) VALUES (?, ?, ?, ?, ?, ?, 'pending')", [projectId, collectionId, externalId, title, description, JSON.stringify(tags)]);
      await createRoundInTransaction(tx, id, projectId, collectionId, { title, description, tags, images: prepared }, undefined, 'draft');
      return (await notesRepository.findById(id))!;
    });
  },

  async createFromUrls(title: string, description: string, imageUrls: string[], collectionId: number, tags: string[], externalId: string | null = null): Promise<Note> {
    const collection = await database.one<{ project_id: number }>('SELECT project_id FROM collections WHERE id = ?', [collectionId]);
    if (!collection) throw new Error('作品交付集不存在');
    const projectId = Number(collection.project_id);
    const prepared = await prepareExternalImages(imageUrls);
    return withTransaction(async (tx) => {
      const id = await tx.insertId("INSERT INTO notes (project_id, collection_id, external_id, title, description, tags, review_status) VALUES (?, ?, ?, ?, ?, ?, 'pending')", [projectId, collectionId, externalId, title, description, JSON.stringify(tags)]);
      await createRoundInTransaction(tx, id, projectId, collectionId, { title, description, tags, images: prepared }, undefined, 'draft');
      return (await notesRepository.findById(id))!;
    });
  },

  async findByExternalId(collectionId: number, externalId: string): Promise<Note | null> { return notesRepository.findByExternalId(collectionId, externalId); },
  async findByProjectExternalId(projectId: number, externalId: string): Promise<Note | null> { return notesRepository.findByProjectExternalId(projectId, externalId); },

  async createRound(id: number, round: UploadRound, createdBy?: number): Promise<Note> {
    const current = await notesRepository.findById(id);
    if (!current) throw new Error('作品不存在');
    const prepared = await prepareUploadRound(round);
    await withTransaction((tx) => createRoundInTransaction(tx, id, current.project_id, current.collection_id, prepared, createdBy, current.review_status));
    return (await notesRepository.findById(id))!;
  },

  async createRoundFromUrls(id: number, round: UrlRound, createdBy?: number): Promise<Note> {
    const current = await notesRepository.findById(id);
    if (!current) throw new Error('作品不存在');
    const prepared = { ...round, images: await prepareExternalImages(round.images) };
    await withTransaction((tx) => createRoundInTransaction(tx, id, current.project_id, current.collection_id, prepared, createdBy, current.review_status));
    return (await notesRepository.findById(id))!;
  },

  async createVersion(id: number, title: string, description: string, files: UploadedFile[], tags: string[], createdBy?: number): Promise<Note> {
    return this.createRound(id, { title, description, tags, files }, createdBy);
  },

  async createVersionFromUrls(id: number, title: string, description: string, imageUrls: string[], tags: string[], createdBy?: number): Promise<Note> {
    return this.createRoundFromUrls(id, { title, description, tags, images: imageUrls }, createdBy);
  },

  async getFeedback(id: number): Promise<WorkFeedbackBundle | null> {
    const rounds = await database.all<{ round_number: number; version_number: number }>('SELECT r.round_number, v.version_number FROM review_rounds r JOIN work_versions v ON v.review_round_id = r.id WHERE r.note_id = ? ORDER BY r.round_number DESC', [id]);
    if (!rounds.length && !await notesRepository.findById(id)) return null;
    const imageAnnotations = await database.all<Array<WorkFeedbackBundle['rounds'][number]['image_annotations'][number] & { version_number: number }>[number]>(`SELECT a.*, i.id AS image_id, i.url AS image_url, i.version_number FROM annotations a JOIN images i ON i.id = a.image_id WHERE i.note_id = ? ORDER BY a.id`, [id]);
    const textAnnotations = await database.all<Array<NoteDetail['text_annotations'][number] & { version_number: number }>[number]>('SELECT * FROM text_annotations WHERE note_id = ? ORDER BY id', [id]);
    const comments = await database.all<NoteDetail['comments'][number]>('SELECT * FROM work_comments WHERE note_id = ? ORDER BY id', [id]);
    const replies = await database.all<NoteDetail['feedback_replies'][number]>('SELECT * FROM feedback_replies WHERE note_id = ? ORDER BY id', [id]);
    const events = await database.all<NoteDetail['review_events'][number]>('SELECT * FROM review_events WHERE note_id = ? ORDER BY id', [id]);
    return {
      work_id: id,
      rounds: rounds.map((round) => ({
        round_number: Number(round.round_number),
        version_number: Number(round.version_number),
        image_annotations: imageAnnotations.filter((item) => Number(item.version_number) === Number(round.version_number)),
        text_annotations: textAnnotations.filter((item) => Number(item.version_number) === Number(round.version_number)),
        comments: comments.filter((item) => Number(item.version_number) === Number(round.version_number)),
        feedback_replies: replies.filter((item) => Number(item.version_number) === Number(round.version_number)),
        review_events: events.filter((item) => Number(item.version_number) === Number(round.version_number)),
      })),
    };
  },

  async remove(id: number) {
    return withTransaction(async (tx) => {
      const note = await tx.one<{ collection_id: number; project_id: number }>('SELECT collection_id, project_id FROM notes WHERE id = ?', [id]);
      if (!note) return false;
      const removed = (await tx.execute('DELETE FROM notes WHERE id = ?', [id])).changes > 0;
      if (removed) {
        await recalculateCollectionStatus(Number(note.collection_id), tx);
        await recalculateProjectReviewStatus(Number(note.project_id), tx);
      }
      return removed;
    });
  },

  async setStatus(id: number, status: ReviewStatus) {
    return withTransaction(async (tx) => {
      const note = await tx.one<{ collection_id: number; project_id: number; active_round_id: number | null }>('SELECT collection_id, project_id, active_round_id FROM notes WHERE id = ?', [id]);
      if (!note) return false;
      await tx.execute('UPDATE notes SET review_status = ? WHERE id = ?', [status, id]);
      if (note.active_round_id) {
        await tx.execute("UPDATE work_versions SET review_status = ?, candidate_status = ? WHERE review_round_id = ?", [status, status === 'draft' ? 'draft' : 'pending', note.active_round_id]);
        await tx.execute("UPDATE review_rounds SET status = ?, completion_reason = '', selected_version_number = NULL, completed_at = NULL WHERE id = ?", [status === 'draft' ? 'draft' : 'reviewing', note.active_round_id]);
      }
      await recalculateCollectionStatus(Number(note.collection_id), tx);
      await recalculateProjectReviewStatus(Number(note.project_id), tx);
      return true;
    });
  },
};