import { describe, it, expect, beforeEach, afterEach } from 'vitest';
import { createMigratedTestDb } from '@/tests/helpers/db';
import type { SqliteDatabase } from '@/lib/db/sqlite';
import { UserRepository } from '@/repositories/UserRepository';
import { ProjectRepository } from '@/repositories/ProjectRepository';
import { ProjectMemberRepository } from '@/repositories/ProjectMemberRepository';
import { TodoRepository } from '@/repositories/TodoRepository';
import { FileRepository } from '@/repositories/FileRepository';
import { AttachmentRepository } from '@/repositories/AttachmentRepository';
import { NotificationRepository } from '@/repositories/NotificationRepository';
import { ActivityLogRepository } from '@/repositories/ActivityLogRepository';
import { NotificationService } from '@/services/NotificationService';
import { ActivityLogService } from '@/services/ActivityLogService';
import { AttachmentService } from '@/services/AttachmentService';
import { TodoService } from '@/services/TodoService';
import { SseHub } from '@/lib/sse/hub';
import { ForbiddenError, NotFoundError } from '@/lib/errors';

function makeService(db: SqliteDatabase) {
  const hub = new SseHub();
  const members = new ProjectMemberRepository(db);
  const users = new UserRepository(db);
  return {
    hub,
    service: new TodoService(
      new TodoRepository(db),
      members,
      new NotificationService(new NotificationRepository(db)),
      new ActivityLogService(new ActivityLogRepository(db)),
      hub,
      new AttachmentService(
        new AttachmentRepository(db),
        new FileRepository(db),
        members
      ),
      db
    ),
    members,
    users,
  };
}

describe('TodoService', () => {
  let db: SqliteDatabase;
  let service: TodoService;
  let projectId: number;
  let authorId: number;
  let memberId: number;
  let outsiderId: number;

  beforeEach(() => {
    db = createMigratedTestDb();
    const ctx = makeService(db);
    service = ctx.service;
    const users = ctx.users;
    authorId = users.create({
      name: 'A',
      email: 'a@example.com',
      passwordHash: 'h',
    }).id;
    memberId = users.create({
      name: 'M',
      email: 'm@example.com',
      passwordHash: 'h',
    }).id;
    outsiderId = users.create({
      name: 'O',
      email: 'o@example.com',
      passwordHash: 'h',
    }).id;
    projectId = new ProjectRepository(db).create({
      name: 'P',
      ownerId: authorId,
    }).id;
    ctx.members.add(projectId, authorId, 'admin');
    ctx.members.add(projectId, memberId, 'member');
  });

  afterEach(() => db.close());

  it('auto-creates the 5 standard columns on first getColumns', () => {
    const cols = service.getColumns(authorId, projectId);
    expect(cols.map((c) => c.name)).toEqual([
      'Backlog',
      'To Do',
      'In Progress',
      'Review',
      'Done',
    ]);
  });

  it('forbids a non-member from accessing columns', () => {
    expect(() => service.getColumns(outsiderId, projectId)).toThrow(
      ForbiddenError
    );
  });

  it('creates an item with assignee → todo_assigned notification + todo_created activity', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(authorId, projectId, {
      title: 'task',
      columnId: col.id,
      assigneeId: memberId,
      priority: 'high',
    });
    expect(item.assigneeId).toBe(memberId);
    expect(new NotificationRepository(db).countUnreadByUser(memberId)).toBe(1);
    expect(
      new ActivityLogRepository(db)
        .findByProject(projectId)
        .items.some((l) => l.action === 'todo_created')
    ).toBe(true);
  });

  it('does not notify when assigning to self', () => {
    const col = service.getColumns(authorId, projectId)[0];
    service.createItem(authorId, projectId, {
      title: 'self',
      columnId: col.id,
      assigneeId: authorId,
    });
    expect(new NotificationRepository(db).countUnreadByUser(authorId)).toBe(0);
  });

  it('toggling complete sets completedAt and logs todo_completed', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
    });
    const completed = service.toggleComplete(authorId, item.id);
    expect(completed.completedAt).not.toBeNull();
    expect(
      new ActivityLogRepository(db)
        .findByProject(projectId)
        .items.some((l) => l.action === 'todo_completed')
    ).toBe(true);
    // もう一度トグルで未完了に戻る
    const reopened = service.toggleComplete(authorId, item.id);
    expect(reopened.completedAt).toBeNull();
  });

  it('moves an item to another column', () => {
    const cols = service.getColumns(authorId, projectId);
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: cols[0].id,
    });
    const moved = service.moveItem(authorId, item.id, cols[4].id, 0);
    expect(moved.columnId).toBe(cols[4].id);
  });

  it('only creator or admin can delete an item', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(memberId, projectId, {
      title: 't',
      columnId: col.id,
    });
    expect(() => service.deleteItem(outsiderId, item.id)).toThrow(
      ForbiddenError
    );
    service.deleteItem(authorId, item.id); // admin
    expect(() => service.toggleComplete(memberId, item.id)).toThrow(
      NotFoundError
    );
  });

  it('throws NotFoundError for a non-existent item', () => {
    expect(() => service.toggleComplete(authorId, 99999)).toThrow(
      NotFoundError
    );
  });

  it('createItem persists startDate/tags and attaches files', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const fileRepo = new FileRepository(db);
    const f1 = fileRepo.create({
      projectId,
      uploaderId: authorId,
      filename: 'a.png',
      originalName: 'a.png',
      mimeType: 'image/png',
      size: 1,
      path: '/tmp/a.png',
      source: 'attachment',
    });
    const item = service.createItem(authorId, projectId, {
      title: 'rich',
      columnId: col.id,
      startDate: '2026-07-01',
      dueDate: '2026-07-31',
      tags: 'frontend,urgent',
      fileIds: [f1.id],
    });
    expect(item.startDate).toBe('2026-07-01');
    expect(item.tags).toBe('frontend,urgent');
    expect(service.getItemAttachments(authorId, item.id)).toHaveLength(1);
  });

  it('updateItem updates startDate/tags and attaches new files', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
    });
    const fileRepo = new FileRepository(db);
    const f1 = fileRepo.create({
      projectId,
      uploaderId: authorId,
      filename: 'b.png',
      originalName: 'b.png',
      mimeType: 'image/png',
      size: 1,
      path: '/tmp/b.png',
      source: 'attachment',
    });
    const updated = service.updateItem(authorId, item.id, {
      description: 'desc',
      startDate: '2026-08-01',
      tags: 'backend',
      fileIds: [f1.id],
    });
    expect(updated.description).toBe('desc');
    expect(updated.startDate).toBe('2026-08-01');
    expect(updated.tags).toBe('backend');
    expect(service.getItemAttachments(authorId, item.id)).toHaveLength(1);
  });

  it('deleteItem detaches its attachments', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const fileRepo = new FileRepository(db);
    const f1 = fileRepo.create({
      projectId,
      uploaderId: authorId,
      filename: 'a.png',
      originalName: 'a.png',
      mimeType: 'image/png',
      size: 1,
      path: '/tmp/a.png',
      source: 'attachment',
    });
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
      fileIds: [f1.id],
    });
    expect(service.getItemAttachments(authorId, item.id)).toHaveLength(1);
    service.deleteItem(authorId, item.id);
    expect(
      new AttachmentRepository(db).findByTarget('todo_item', item.id)
    ).toHaveLength(0);
  });

  it('getItem and getItemAttachments enforce membership', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
    });
    expect(service.getItem(authorId, item.id).id).toBe(item.id);
    expect(() => service.getItem(outsiderId, item.id)).toThrow(ForbiddenError);
    expect(() => service.getItemAttachments(outsiderId, item.id)).toThrow(
      ForbiddenError
    );
  });

  it('only the creator or an admin can delete an item (member-but-not-creator cannot)', () => {
    const col = service.getColumns(authorId, projectId)[0];
    // authorId(admin)が作成したアイテムを memberId(非管理者・非作成者)は削除できない
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
    });
    expect(() => service.deleteItem(memberId, item.id)).toThrow(ForbiddenError);
    // admin(作成者)は削除可
    service.deleteItem(authorId, item.id);
    expect(() => service.getItem(authorId, item.id)).toThrow(NotFoundError);
  });

  it('deleteColumn: admin can delete, non-admin member cannot', () => {
    const col = service.getColumns(authorId, projectId)[0];
    // memberId(非管理者)はカラム削除不可
    expect(() => service.deleteColumn(memberId, col.id)).toThrow(
      ForbiddenError
    );
    // authorId(admin)は削除可
    service.deleteColumn(authorId, col.id);
    expect(() => service.updateColumn(authorId, col.id, { name: 'x' })).toThrow(
      NotFoundError
    );
  });

  it('clears startDate/tags/assigneeId via null on update', () => {
    const col = service.getColumns(authorId, projectId)[0];
    const item = service.createItem(authorId, projectId, {
      title: 't',
      columnId: col.id,
      startDate: '2026-07-01',
      tags: 'a,b',
      assigneeId: memberId,
    });
    const cleared = service.updateItem(authorId, item.id, {
      startDate: null,
      tags: null,
      assigneeId: null,
    });
    expect(cleared.startDate).toBeNull();
    expect(cleared.tags).toBeNull();
    expect(cleared.assigneeId).toBeNull();
  });

  describe('reorderItems', () => {
    it('renumbers items within a column in the given order', () => {
      const cols = service.getColumns(authorId, projectId);
      const col = cols[0];
      const a = service.createItem(authorId, projectId, {
        title: 'A',
        columnId: col.id,
      });
      const b = service.createItem(authorId, projectId, {
        title: 'B',
        columnId: col.id,
      });
      const c = service.createItem(authorId, projectId, {
        title: 'C',
        columnId: col.id,
      });
      // 逆順に並べ替え
      const result = service.reorderItems(authorId, projectId, col.id, [
        c.id,
        b.id,
        a.id,
      ]);
      expect(result.map((i) => i.title)).toEqual(['C', 'B', 'A']);
      expect(result.map((i) => i.orderIndex)).toEqual([0, 1, 2]);
    });

    it('moves an item from another column into the target position', () => {
      const cols = service.getColumns(authorId, projectId);
      const src = cols[0];
      const dest = cols[1];
      const a = service.createItem(authorId, projectId, {
        title: 'A',
        columnId: dest.id,
      });
      const b = service.createItem(authorId, projectId, {
        title: 'B',
        columnId: dest.id,
      });
      const x = service.createItem(authorId, projectId, {
        title: 'X',
        columnId: src.id,
      });
      // X を A と B の間に挿入
      service.reorderItems(authorId, projectId, dest.id, [a.id, x.id, b.id]);
      const destItems = service
        .getItems(authorId, projectId)
        .filter((i) => i.columnId === dest.id);
      expect(destItems.map((i) => i.title)).toEqual(['A', 'X', 'B']);
      // X は元のカラムからいなくなる
      const srcItems = service
        .getItems(authorId, projectId)
        .filter((i) => i.columnId === src.id);
      expect(srcItems.find((i) => i.id === x.id)).toBeUndefined();
    });

    it('forbids a non-member from reordering', () => {
      const col = service.getColumns(authorId, projectId)[0];
      expect(() =>
        service.reorderItems(outsiderId, projectId, col.id, [])
      ).toThrow(ForbiddenError);
    });

    it('rejects an unknown column or item', () => {
      const col = service.getColumns(authorId, projectId)[0];
      expect(() =>
        service.reorderItems(authorId, projectId, 99999, [])
      ).toThrow(NotFoundError);
      expect(() =>
        service.reorderItems(authorId, projectId, col.id, [99999])
      ).toThrow(NotFoundError);
    });
  });
});