import { Injectable, Logger, OnModuleInit } from "@nestjs/common";
import { InjectModel } from "@nestjs/mongoose";
import { Model } from "mongoose";
import {
  FANAVARAN_CLIENT_KEYS,
  SEED_FANAVARAN_CLIENT_PROFILES,
  setFanavaranClientProfilesCache,
  type FanavaranClientKey,
  type FanavaranClientProfile,
} from "src/core/config/fanavaran-client.config";
import {
  FanavaranClientConfig,
  FanavaranClientConfigDocument,
} from "./schema/fanavaran-client-config.schema";

/**
 * Loads / seeds per-tenant Fanavaran auth+defaults from Mongo and exposes them
 * through the sync helpers in fanavaran-client.config.ts.
 *
 * Boot behaviour: for each known client key, if no document exists, insert the
 * seed profile. Existing documents are never overwritten (ops can edit Mongo).
 */
@Injectable()
export class FanavaranClientConfigService implements OnModuleInit {
  private readonly logger = new Logger(FanavaranClientConfigService.name);

  constructor(
    @InjectModel(FanavaranClientConfig.name)
    private readonly configModel: Model<FanavaranClientConfigDocument>,
  ) {}

  async onModuleInit(): Promise<void> {
    await this.seedMissingProfiles();
    await this.reloadCache();
  }

  async seedMissingProfiles(): Promise<void> {
    for (const key of FANAVARAN_CLIENT_KEYS) {
      const seed = SEED_FANAVARAN_CLIENT_PROFILES[key];
      const existing = await this.configModel
        .findOne({ key })
        .select({ _id: 1 })
        .lean()
        .exec();
      if (existing) {
        continue;
      }
      await this.configModel.create({
        key: seed.key,
        auth: seed.auth,
        defaults: seed.defaults,
      });
      this.logger.log(
        `Seeded fanavaranClientConfigs for client "${key}" (ClaimExpertId=${seed.defaults.ClaimExpertId}, ExpertiseClaimExpertId=${seed.defaults.ExpertiseClaimExpertId})`,
      );
    }
  }

  async reloadCache(): Promise<void> {
    const docs = await this.configModel.find().lean().exec();
    const cache: Partial<Record<FanavaranClientKey, FanavaranClientProfile>> =
      {};

    for (const key of FANAVARAN_CLIENT_KEYS) {
      const doc = docs.find((row) => row.key === key);
      if (doc?.auth && doc?.defaults) {
        cache[key] = {
          key,
          auth: {
            appName: doc.auth.appName,
            secret: doc.auth.secret,
            username: doc.auth.username,
            password: doc.auth.password,
            corpId: doc.auth.corpId,
            contractId: doc.auth.contractId,
            location: doc.auth.location,
          },
          defaults: { ...doc.defaults },
        };
      } else {
        cache[key] = SEED_FANAVARAN_CLIENT_PROFILES[key];
      }
    }

    setFanavaranClientProfilesCache(cache);
    this.logger.log(
      `Loaded ${docs.length} Fanavaran client config(s) from Mongo into runtime cache`,
    );
  }

  async findByKey(key: FanavaranClientKey) {
    return this.configModel.findOne({ key }).lean().exec();
  }

  async list() {
    return this.configModel.find().lean().exec();
  }
}