// Copyright (c) 2026 Gordon Bolton. MIT License.
const { logToFile } = require('./logger');
const {
  getSonarrInstances,
  getRadarrInstances
} = require('./config');

// Import retriever classes
const PollingSonarrRetriever = require('../clients/PollingSonarrRetriever');
const PollingRadarrRetriever = require('../clients/PollingRadarrRetriever');

// Retriever type mapping
const retrieverClasses = {
  sonarr: PollingSonarrRetriever,
  radarr: PollingRadarrRetriever
};

/**
 * Singleton registry for *arr data retrievers
 */
const arrRetrieverRegistry = {
  retrievers: new Map(),
  initialized: false,

  /**
   * Initialize all configured *arr retrievers
   */
  async initialize() {
    if (this.initialized) {
      return;
    }

    logToFile('[ArrRetrieverRegistry] Initializing *arr retrievers...');

    // Get all instance configurations
    const sonarrInstances = getSonarrInstances();
    const radarrInstances = getRadarrInstances();

    // Create retriever instances
    const instanceConfigs = [
      ...sonarrInstances.map(inst => ({ ...inst, type: 'sonarr' })),
      ...radarrInstances.map(inst => ({ ...inst, type: 'radarr' }))
    ];

    for (const config of instanceConfigs) {
      try {
        const RetrieverClass = retrieverClasses[config.type];
        if (!RetrieverClass) {
          logToFile(`[ArrRetrieverRegistry] Unknown retriever type: ${config.type}`);
          continue;
        }

        const retriever = new RetrieverClass(config);
        this.retrievers.set(config.id, retriever);
        logToFile(`[ArrRetrieverRegistry] Created ${config.type} retriever: ${config.name} (${config.id})`);
      } catch (error) {
        logToFile(`[ArrRetrieverRegistry] Failed to create retriever ${config.id}: ${error.message}`);
      }
    }

    this.initialized = true;
    logToFile(`[ArrRetrieverRegistry] Initialized ${this.retrievers.size} *arr retrievers`);
  },

  /**
   * Get all registered retrievers
   * @returns {Array<ArrRetriever>} Array of retriever instances
   */
  getAllRetrievers() {
    return Array.from(this.retrievers.values());
  },

  /**
   * Get retriever by instance ID
   * @param {string} instanceId - The instance ID
   * @returns {ArrRetriever|null} Retriever instance or null if not found
   */
  getRetriever(instanceId) {
    return this.retrievers.get(instanceId) || null;
  },

  /**
   * Get retrievers by type
   * @param {string} type - Retriever type ('sonarr', 'radarr')
   * @returns {Array<ArrRetriever>} Array of retriever instances
   */
  getRetrieversByType(type) {
    return this.getAllRetrievers().filter(retriever => retriever.getRetrieverType() === type);
  },

  /**
   * Get tags from all retrievers
   * @returns {Promise<Array<Object>>} Array of tag results with instance info
   */
  async getAllTags() {
    const retrievers = this.getAllRetrievers();
    if (retrievers.length === 0) {
      return [];
    }

    // Fetch tags from all retrievers in parallel
    const results = await Promise.allSettled(
      retrievers.map(async (retriever) => {
        try {
          const tags = await retriever.getTags();
          logToFile(`[ArrRetrieverRegistry] ${retriever.name}: ${tags.length} tags`);
          return { instance: retriever.getInstanceId(), data: tags };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching tags from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: [] };
        }
      })
    );

    return results
      .filter(result => result.status === 'fulfilled')
      .map(result => result.value);
  },

  /**
   * Get queue from all retrievers
   * @returns {Promise<Array<Object>>} Array of queue results with instance info
   */
  async getAllQueues() {
    const retrievers = this.getAllRetrievers();
    if (retrievers.length === 0) {
      return [];
    }

    // Fetch queues from all retrievers in parallel
    const results = await Promise.allSettled(
      retrievers.map(async (retriever) => {
        try {
          const queue = await retriever.getQueue();
          logToFile(`[ArrRetrieverRegistry] ${retriever.name}: ${(queue.records || []).length} queue items`);
          return { instance: retriever.getInstanceId(), data: queue };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching queue from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    return results
      .filter(result => result.status === 'fulfilled')
      .map(result => result.value);
  },

  /**
   * Get history from all retrievers
   * @param {Object} options - Optional parameters for history fetch
   * @returns {Promise<Array<Object>>} Array of history results with instance info
   */
  async getAllHistory(options = {}) {
    const retrievers = this.getAllRetrievers();
    if (retrievers.length === 0) {
      return [];
    }

    // Fetch history from all retrievers in parallel
    const results = await Promise.allSettled(
      retrievers.map(async (retriever) => {
        try {
          const history = await retriever.getHistory(options);
          logToFile(`[ArrRetrieverRegistry] ${retriever.name}: ${(history.records || []).length} history records`);
          return { instance: retriever.getInstanceId(), data: history };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching history from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    return results
      .filter(result => result.status === 'fulfilled')
      .map(result => result.value);
  },

  /**
   * Get tags grouped by retriever type
   * @returns {Promise<Object>} Tags grouped by retriever type (array of { instance, data } objects)
   */
  async getTagsByType() {
    const sonarrRetrievers = this.getRetrieversByType('sonarr');
    const radarrRetrievers = this.getRetrieversByType('radarr');

    const sonarrTags = await Promise.allSettled(
      sonarrRetrievers.map(async (retriever) => {
        try {
          const tags = await retriever.getTags();
          return { instance: retriever.getInstanceId(), data: tags };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching tags from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: [] };
        }
      })
    );

    const radarrTags = await Promise.allSettled(
      radarrRetrievers.map(async (retriever) => {
        try {
          const tags = await retriever.getTags();
          return { instance: retriever.getInstanceId(), data: tags };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching tags from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: [] };
        }
      })
    );

    return {
      sonarr: sonarrTags
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value),
      radarr: radarrTags
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value)
    };
  },

  /**
   * Get queue grouped by retriever type
   * @returns {Promise<Object>} Queue grouped by retriever type
   */
  async getQueuesByType() {
    const sonarrRetrievers = this.getRetrieversByType('sonarr');
    const radarrRetrievers = this.getRetrieversByType('radarr');

    const sonarrQueues = await Promise.allSettled(
      sonarrRetrievers.map(async (retriever) => {
        try {
          const queue = await retriever.getQueue();
          return { instance: retriever.getInstanceId(), data: queue };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching queue from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    const radarrQueues = await Promise.allSettled(
      radarrRetrievers.map(async (retriever) => {
        try {
          const queue = await retriever.getQueue();
          return { instance: retriever.getInstanceId(), data: queue };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching queue from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    return {
      sonarr: sonarrQueues
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value),
      radarr: radarrQueues
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value)
    };
  },

  /**
   * Get history grouped by retriever type
   * @param {Object} options - Optional parameters for history fetch
   * @returns {Promise<Object>} History grouped by retriever type
   */
  async getHistoryByType(options = {}) {
    const sonarrRetrievers = this.getRetrieversByType('sonarr');
    const radarrRetrievers = this.getRetrieversByType('radarr');

    const sonarrHistory = await Promise.allSettled(
      sonarrRetrievers.map(async (retriever) => {
        try {
          const history = await retriever.getHistory(options);
          return { instance: retriever.getInstanceId(), data: history };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching history from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    const radarrHistory = await Promise.allSettled(
      radarrRetrievers.map(async (retriever) => {
        try {
          const history = await retriever.getHistory(options);
          return { instance: retriever.getInstanceId(), data: history };
        } catch (error) {
          logToFile(`[ArrRetrieverRegistry] Error fetching history from ${retriever.name}: ${error.message}`);
          return { instance: retriever.getInstanceId(), data: { records: [] } };
        }
      })
    );

    return {
      sonarr: sonarrHistory
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value),
      radarr: radarrHistory
        .filter(result => result.status === 'fulfilled')
        .map(result => result.value)
    };
  }
};

module.exports = arrRetrieverRegistry;