import { Injectable } from '@nestjs/common';
import { InjectModel } from '@nestjs/mongoose';
import { UserRegistry } from '@task-stream/api/identity/application';
import { User, UserFactory } from '@task-stream/api/identity/domain';
import { Model } from 'mongoose';
import { UserDocument } from './user.schema';

@Injectable()
export class MongoUserRegistry extends UserRegistry {
  constructor(
    @InjectModel(UserDocument.name) private readonly users: Model<UserDocument>,
    private readonly factory: UserFactory,
  ) {
    super();
  }

  async upsert(user: User): Promise<void> {
    await this.users.updateOne(
      { id: user.id },
      { $set: { name: user.name, email: user.email, isActive: user.isActive } },
      { upsert: true },
    );
  }

  async findById(id: string): Promise<User | null> {
    const doc = await this.users.findOne({ id }).lean();
    return doc ? this.toUser(doc) : null;
  }

  async findByIds(ids: string[]): Promise<User[]> {
    if (ids.length === 0) return [];
    const docs = await this.users.find({ id: { $in: ids } }).lean();
    return docs.map((d) => this.toUser(d));
  }

  async search(term: string, limit: number): Promise<User[]> {
    const pattern = new RegExp(
      term.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'),
      'i',
    );
    const docs = await this.users
      .find(term ? { $or: [{ name: pattern }, { email: pattern }] } : {})
      .sort({ name: 1 })
      .limit(limit)
      .lean();
    return docs.map((d) => this.toUser(d));
  }

  private toUser(doc: UserDocument): User {
    return this.factory.restore({
      id: doc.id,
      name: doc.name,
      email: doc.email,
      isActive: doc.isActive,
    });
  }
}