import { SystemConfig, SystemConfigEntity, SystemConfigKey } from '@app/database/entities/system-config.entity';
import { Injectable } from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import * as _ from 'lodash';
import { DeepPartial, In, Repository } from 'typeorm';

const defaults: SystemConfig = Object.freeze({
  ffmpeg: {
    crf: '23',
    preset: 'ultrafast',
    targetVideoCodec: 'libx264',
    targetAudioCodec: 'mp3',
    targetScaling: '1280:-2',
  },
  oauth: {
    enabled: false,
    issuerUrl: '',
    clientId: '',
    clientSecret: '',
    scope: 'openid email profile',
    buttonText: 'Login with OAuth',
    autoRegister: true,
  },
});

@Injectable()
export class ImmichConfigService {
  constructor(
    @InjectRepository(SystemConfigEntity)
    private systemConfigRepository: Repository<SystemConfigEntity>,
  ) {}

  public getDefaults(): SystemConfig {
    return defaults;
  }

  public async getConfig() {
    const overrides = await this.systemConfigRepository.find();
    const config: DeepPartial<SystemConfig> = {};
    for (const { key, value } of overrides) {
      // set via dot notation
      _.set(config, key, value);
    }

    return _.defaultsDeep(config, defaults) as SystemConfig;
  }

  public async updateConfig(config: DeepPartial<SystemConfig> | null): Promise<void> {
    const updates: SystemConfigEntity[] = [];
    const deletes: SystemConfigEntity[] = [];

    for (const key of Object.values(SystemConfigKey)) {
      // get via dot notation
      const item = { key, value: _.get(config, key) };
      const defaultValue = _.get(defaults, key);
      const isMissing = !_.has(config, key);

      if (isMissing || item.value === null || item.value === '' || item.value === defaultValue) {
        deletes.push(item);
        continue;
      }

      updates.push(item);
    }

    if (updates.length > 0) {
      await this.systemConfigRepository.save(updates);
    }

    if (deletes.length > 0) {
      await this.systemConfigRepository.delete({ key: In(deletes.map((item) => item.key)) });
    }
  }
}