import fs from 'fs';
import SquadLayers, {
  SquadLayers as SquadLayersClass
} from './squad-layers.js';

export default class SquadLayerFilter extends SquadLayersClass {
  constructor(layers, activeLayerFilter = null) {
    super(layers);

    if (activeLayerFilter === null) {
      this.activeLayerFilter = null;
    } else {
      this.activeLayerFilter = {
        historyResetTime: 5 * 60 * 60 * 1000,
        layerHistoryTolerance: 8,
        mapHistoryTolerance: 4,
        gamemodeHistoryTolerance: {
          // defaults as off
          ...activeLayerFilter.gamemodeHistoryTolerance
        },
        playerCountComplianceEnabled: true,
        ...activeLayerFilter
      };
    }
  }

  static buildFromList(layerNames, activeLayerFilter) {
    return new SquadLayerFilter(layerNames, activeLayerFilter);
  }

  static buildFromDidYouMeanList(layerNames, activeLayerFilter) {
    const layers = [];
    for (const layerName of layerNames) {
      const layer = SquadLayers.getLayerByDidYouMean(
        layerName,
        SquadLayers.getLayerNames()
      );
      if (layer) layers.push(layer);
    }
    return new SquadLayerFilter(layers, activeLayerFilter);
  }

  static buildFromFile(filename, activeLayerFilter, delimiter = '\n') {
    const lines = fs
      .readFileSync('./connectors/data/layers.json', 'utf8')
      .split(delimiter);
    const layers = [];

    const validLayerNames = SquadLayers.getLayerNames();

    for (const line of lines) {
      if (validLayerNames.contains(line))
        layers.push(SquadLayers.getLayerByLayerName(line));
    }
    return new SquadLayerFilter(layers, activeLayerFilter);
  }

  static buildFromFilter(filter = {}, activeLayerFilter) {
    const whitelistedLayers = filter.whitelistedLayers || null;
    const blacklistedLayers = filter.blacklistedLayers || null;
    const whitelistedMaps = filter.whitelistedMaps || null;
    const blacklistedMaps = filter.blacklistedMaps || null;
    const whitelistedGamemodes = filter.whitelistedGamemodes || null;
    const blacklistedGamemodes = filter.blacklistedGamemodes || ['Training'];
    const flagCountMin = filter.flagCountMin || null;
    const flagCountMax = filter.flagCountMax || null;
    const hasCommander = filter.hasCommander || null;
    const hasTanks = filter.hasTanks || null;
    const hasHelicopters = filter.hasHelicopters || null;

    const layers = [];

    for (const layer of SquadLayers.getLayers()) {
      // Whitelist / Blacklist Layers
      if (
        whitelistedLayers !== null &&
        !whitelistedLayers.includes(layer.layer)
      )
        continue;
      if (blacklistedLayers !== null && blacklistedLayers.includes(layer.layer))
        continue;

      // Whitelist / Blacklist Maps
      if (whitelistedMaps !== null && !whitelistedMaps.includes(layer.map))
        continue;
      if (blacklistedMaps !== null && blacklistedMaps.includes(layer.map))
        continue;

      // Whitelist / Blacklist Gamemodes
      if (
        whitelistedGamemodes !== null &&
        !whitelistedGamemodes.includes(layer.gamemode)
      )
        continue;
      if (
        blacklistedGamemodes !== null &&
        blacklistedGamemodes.includes(layer.gamemode)
      )
        continue;

      // Flag Count
      if (flagCountMin !== null && layer.flagCount < flagCountMin) continue;
      if (flagCountMax !== null && layer.flagCount > flagCountMax) continue;

      // Other Properties
      if (hasCommander !== null && layer.commander !== hasCommander) continue;
      if (hasTanks !== null && (layer.tanks !== 'N/A') !== hasTanks) continue;
      if (
        hasHelicopters !== null &&
        (layer.helicopters !== 'N/A') !== hasHelicopters
      )
        continue;

      layers.push(layer);
    }

    return new SquadLayerFilter(layers, activeLayerFilter);
  }

  inLayerPool(layer) {
    if (typeof layer === 'object') layer = layer.layer;
    return super.getLayerNames().includes(layer);
  }

  isLayerHistoryCompliant(server, layer) {
    if (this.activeLayerFilter === null) return true;

    if (typeof layer === 'object') layer = layer.layer;

    for (
      let i = 0;
      i <
      Math.min(
        server.layerHistory.length,
        this.activeLayerFilter.layerHistoryTolerance
      );
      i++
    ) {
      if (
        new Date() - server.layerHistory[i].time >
        this.activeLayerFilter.historyResetTime
      )
        return true;
      if (server.layerHistory[i].layer === layer) return false;
    }
    return true;
  }

  isMapHistoryCompliant(server, layer) {
    if (this.activeLayerFilter === null) return true;

    if (typeof layer === 'string')
      layer = SquadLayers.getLayerByLayerName(layer);

    for (
      let i = 0;
      i <
      Math.min(
        server.layerHistory.length,
        this.activeLayerFilter.mapHistoryTolerance
      );
      i++
    ) {
      if (
        new Date() - server.layerHistory[i].time >
        this.activeLayerFilter.historyResetTime
      )
        return true;
      if (server.layerHistory[i].map === layer.map) return false;
    }
    return true;
  }

  isGamemodeHistoryCompliant(server, layer) {
    if (this.activeLayerFilter === null) return true;

    if (typeof layer === 'string')
      layer = SquadLayers.getLayerByLayerName(layer);

    const gamemodeHistoryTolerance = this.activeLayerFilter
      .gamemodeHistoryTolerance[layer.gamemode];
    if (!gamemodeHistoryTolerance) return true;

    for (
      let i = 0;
      i < Math.min(server.layerHistory.length, gamemodeHistoryTolerance);
      i++
    ) {
      if (
        new Date() - server.layerHistory[i].time >
        this.activeLayerFilter.historyResetTime
      )
        return true;

      const historyLayer = SquadLayers.getLayerByLayerName(
        server.layerHistory[i].layer
      );
      if (historyLayer && historyLayer.gamemode === layer.gamemode)
        return false;
    }
    return true;
  }

  isPlayerCountCompliant(server, layer) {
    if (
      this.activeLayerFilter === null ||
      this.playerCountComplianceEnabled === false
    )
      return true;

    if (typeof layer === 'string')
      layer = SquadLayers.getLayerByLayerName(layer);

    return !(
      server.players.length > layer.estimatedSuitablePlayerCount.max ||
      server.players.length < layer.estimatedSuitablePlayerCount.min
    );
  }
}