'use strict';

const playerArrayContains = require('./util').playerArrayContains;

const WHITESPACE = ' ';

const VehicleClasses = Object.freeze({
  LIGHT: 'Leicht',
  HEAVY: 'Schwer',
  AIR: 'Flug',
  UNKNOWN: 'Unbekannt',
});

const playerNameRegex = /(^|,\s)(.*?)\s\(/g;

const budgetPlayerNameRegex = /\d*\.\s(.*)\s\(ver\)kaufte/;

const budgetItemNameRegex = /\(ver\)kaufte\s(.*)\"$/;

const budgetRespawnNameRegex = /Respawn\svon\s(.*)\"$/;

const vehicleNameEndRegex = /\s\(\w+:/;

const sideRegex = /(side:\s(.*?)\))/;

const magazineRegex = /(magazine:\s(.*?)\))/;

const vehicleRegex = /(vehicle:\s(.*?)\))/;

const categoryRegex = /(category:\s(.*?)\))/;

const bluforPlayerCountRegex = /NATO\s(\d*)/;

const opforPlayerCountRegex = /CSAT\s(\d*)/;

const timestampRegex = /LOG:\s(\d*:\d*:\d*)\s---/;

const singleMinFpsRegex = /Single min\. FPS for (.*):\s(\d*.\d*)"/; // group1 = entity name, group2 = value

const singleAvgFpsRegex = /Single avg\. FPS for (.*):\s(\d*.\d*)"/; // group1 = entity name, group2 = value

const minFpsRegex = /Min\. FPS for (.*):\s\[(.*)\]"/; // group1 = entity name, group2 = comma separated values

const avgFpsRegex = /Avg\. FPS for (.*):\s\[(.*)\]"/; // group1 = entity name, group2 = comma separated values

const parseWarLog = (lineArray, war) => {
  let flagBlufor = true;
  let flagOpfor = true;

  const NAME_TOO_LONG_ERROR = 'Error: ENAMETOOLONG: name too long, open \'';

  const stats = {
    war: war,
    clean: [],
    budget: [],
    points: [],
    kills: [],
    vehicles: [],
    respawn: [],
    revive: [],
    flag: [],
    transport: [],
    players: [],
    playerCount: [],
    serverFps: [],
  };

  const VEHICLE_BLACKLIST = [
    'Prowler (Unbewaffnet)', 'Prowler (Bewaffnet)', 'Hunter',
    'HEMTT Transporter', 'HEMTT Transporter (abgedeckt)', 'HEMTT Sanitätsfahrzeug',
    'Remote Designator [NATO]', 'UGV Stomper',
    'Qilin (Unbewaffnet)', 'Qilin (Bewaffnet)', 'Ifrit',
    'Tempest-Transporter', 'Tempest-Transporter (abgedeckt)', 'Tempest Sanitätsfahrzeug',
    'Remote Designator [CSAT]', 'UBF Saif',
    'Quad Bike', 'HuntIR',
  ];

  const addPlayerIfNotExists = (inputPlayer, steamUUID) => {
    const player = getPlayerInfoFromString(inputPlayer);
    if (player && player.name && player.fraction && !playerArrayContains(stats.players, player)) {
      player['warId'] = war._id;
      player['steamUUID'] = steamUUID;
      stats.players.push(player);
    }
  };

  lineArray.some((line) => {
    /**
     * sanitize nameTooLongError coming up in first line
     */
    if (line.includes(NAME_TOO_LONG_ERROR)) {
      line = line.substring(line.indexOf(NAME_TOO_LONG_ERROR) + NAME_TOO_LONG_ERROR.length);
    }

    if (line.includes('(Abschuss)')) {
      /**
       * KILLS & VEHICLE KILLS
       */
      stats.clean.push(line);

      const shooterString = line.substring(line.lastIndexOf(' von: ') + 6, line.search(/$/) - 1);
      const shooter = getPlayerInfoFromString(shooterString);

      if (line.includes('Fahrzeug:')) {
        const targetString = line.substring(line.lastIndexOf(' --- Fahrzeug: ') + 15, line.lastIndexOf(' von:'));
        const target = getVehicleAndFractionFromString(targetString);
        if (target && shooter && target.fraction !== shooter.fraction) {
          const vehicleKill = {
            war: war._id,
            time: getFullTimeDate(war.date, line.split(WHITESPACE)[5]),
            target: target ? target.name : null,
            fraction: shooter ? shooter.fraction : 'NONE',
            vehicleClass: target.vehicleClass,
          };
          if (shooter && shooter.name instanceof Array) {
            vehicleKill.shooter = shooter.name[0];
            vehicleKill.additionalShooter = shooter.name.slice(1, shooter.name.length);
          } else {
            vehicleKill.shooter = shooter ? shooter.name : null;
          }
          if (shooter.magazine) {
            vehicleKill.magazine = shooter.magazine;
          }
          if (shooter.vehicle) {
            vehicleKill.shooterVehicle = shooter.vehicle;
          }

          stats.vehicles.push(vehicleKill);
        }
      } else {
        const targetString = line.substring(line.lastIndexOf(' --- Einheit: ') + 14, line.lastIndexOf(' von:'));
        const target = getPlayerInfoFromString(targetString);
        const kill = {
          war: war._id,
          time: getFullTimeDate(war.date, line.split(WHITESPACE)[5]),
          friendlyFire: false,
        };
        if (shooter) {
          kill.shooter = shooter.name;
          kill.fraction = shooter.fraction;
          if (target) {
            kill.friendlyFire = (target.fraction === shooter.fraction);
          }
          if (shooter.magazine) {
            kill.magazine = shooter.magazine;
          }
          if (shooter.vehicle) {
            kill.shooterVehicle = shooter.vehicle;
          }
        } else {
          kill.fraction = 'NONE';
        }

        if (target) {
          kill.target = target.name;
          if (target.vehicle) {
            kill.targetVehicle = target.vehicle;
          }
        }
        stats.kills.push(kill);
      }
    } else if (line.includes('(Budget)')) {
      /**
       * BUDGET
       */
      stats.clean.push(line);
      const budg = line.split(WHITESPACE);
      if (line.includes('Startbudget')) {
        stats.war['budgetBlufor'] = transformMoneyString(budg[9]);
        stats.war['budgetOpfor'] = transformMoneyString(budg[12].slice(0, -1));

        // this date needs to be assigned in first place !important
        const dateString = budg[0].slice(0, -1).split('/').map((s) => parseInt(s));
        stats.war.date = new Date(dateString[0], dateString[1] - 1, dateString[2]);
      } else if (line.includes('Endbudget')) {
        stats.war['endBudgetBlufor'] = transformMoneyString(budg[9]);
        stats.war['endBudgetOpfor'] = transformMoneyString(budg[12].slice(0, -2));
        stats.war.endDate = getFullTimeDate(war.date, budg[5]);
      } else {
        if (line.includes('Respawn von ')) {
          /**
           * RESPAWN
           */
          const playerName = line.substring(line.lastIndexOf('Respawn von ') + 12, line.lastIndexOf('"'));
          stats.respawn.push(getRespawnEntry(budg, playerName, war._id, war.date));
        }
        stats.budget.push(getBudgetEntry(line, budg, war._id, war.date));
      }
    } else if (line.includes('(Fahne)') && !line.includes('Dominator')) {
      /**
       * FLAG
       */
      const flagFraction = line.includes('NATO Flagge') ? 'BLUFOR' : 'OPFOR';
      const capture = !!line.includes('Flagge erobert');

      if ((flagFraction === 'BLUFOR' && ((capture && flagBlufor) || (!capture && !flagBlufor))) ||
        (flagFraction === 'OPFOR' && ((capture && flagOpfor) || (!capture && !flagOpfor)))) {
        stats.clean.push(line);

        const playerName = line.substring(line.lastIndexOf('rt von ') + 7).slice(0, -1);

        if (flagFraction === 'BLUFOR') {
          flagBlufor = !capture;
        } else if (flagFraction === 'OPFOR') {
          flagOpfor = !capture;
        }

        stats.flag.push({
          war: war._id,
          time: getFullTimeDate(war.date, line.split(WHITESPACE)[5]),
          player: playerName,
          flagFraction: flagFraction,
          capture: capture,
        });
      }
    } else if (line.includes('(Punkte)')) {
      /**
       * POINTS
       */
      stats.clean.push(line);

      const pt = line.split(WHITESPACE);

      if (line.includes('Endpunktestand')) {
        stats.war['ptBlufor'] = parseInt(pt[9]);
        stats.war['ptOpfor'] = parseInt(pt[12].slice(0, -1));
        // EXIT LOOP
        return true;
      } else {
        stats.points.push(getPointsEntry(pt, line, war._id, war.date));
      }
    } else if (line.includes('(Revive)')) {
      /**
       * REVIVE
       */
      stats.clean.push(line);
      const stabilized = !!line.includes('stabilisiert."');
      const medicName = line.substring(line.lastIndexOf('wurde von ') + 10,
        line.lastIndexOf(stabilized ? ' stabilisiert' : ' wiederbelebt'));
      const medic = getPlayerInfoFromString(medicName);
      const patientName = line.substring(line.lastIndexOf('--- ') + 4, line.lastIndexOf(' wurde von'));
      const patient = getPlayerInfoFromString(patientName);

      stats.revive.push({
        war: war._id,
        time: getFullTimeDate(war.date, line.split(WHITESPACE)[5]),
        stabilized: stabilized,
        medic: medic.name,
        patient: patient.name,
        fraction: medic.fraction,
      });
    } else if (line.includes('(Transport)')) {
      /**
       * TRANSPORT
       */
      stats.clean.push(line);
      const driverString = line.substring(line.lastIndexOf('wurde von ') + 10, line.lastIndexOf(' eingeflogen'));
      const driver = getPlayerInfoFromString(driverString);
      const passengerString = line.substring(line.lastIndexOf('--- ') + 3, line.lastIndexOf(' wurde von'));
      const passenger = getPlayerInfoFromString(passengerString);
      const distance = parseInt(line.substring(line.lastIndexOf('eingeflogen (') + 13, line.lastIndexOf('m)') - 1));

      stats.transport.push({
        war: war._id,
        time: getFullTimeDate(war.date, line.split(WHITESPACE)[5]),
        driver: driver ? driver.name : null,
        passenger: passenger ? passenger.name : null,
        fraction: driver ? driver.fraction : 'NONE',
        distance: distance,
      });
    } else if (line.includes('(Spieleranzahl)')) {
      stats.clean.push(line);

      const timestamp = (timestampRegex.exec(line))[1];
      const countBlufor = (bluforPlayerCountRegex.exec(line))[1];
      const countOpfor = (opforPlayerCountRegex.exec(line))[1];

      stats.playerCount.push({
        war: war.id,
        time: getFullTimeDate(war.date, timestamp),
        countBlufor: countBlufor,
        countOpfor: countOpfor,
      });
    } else if (line.includes('(FPS)')) {
      stats.clean.push(line);

      const updateServerFpsLogEntry = (entityName, addKey, addValue) => {
        const idx = stats.serverFps.findIndex((entry) => entry.entityName === entityName);
        if (idx === -1) {
          stats.serverFps.push({
            war: war.id,
            entityName: entityName,
            [addKey]: addValue,
          });
          return;
        }
        const entity = stats.serverFps[idx];
        entity[addKey] = addValue;
        stats.serverFps[idx] = entity;
      };

      const singleMinMatch = singleMinFpsRegex.exec(line);
      if (singleMinMatch) {
        updateServerFpsLogEntry(singleMinMatch[1], 'singleMinFps', singleMinMatch[2]);
      } else {
        const singleAvgMatch = singleAvgFpsRegex.exec(line);
        if (singleAvgMatch) {
          updateServerFpsLogEntry(singleAvgMatch[1], 'singleAvgFps', singleAvgMatch[2]);
        } else {
          const minCollectionMatch = minFpsRegex.exec(line);
          if (minCollectionMatch) {
            updateServerFpsLogEntry(minCollectionMatch[1], 'minFps', minCollectionMatch[2].split(','));
          } else {
            const avgCollectionMatch = avgFpsRegex.exec(line);
            if (avgCollectionMatch) {
              updateServerFpsLogEntry(avgCollectionMatch[1], 'avgFps', avgCollectionMatch[2].split(','));
            }
          }
        }
      }
    } else if (line.includes('(Fraktionsuebersicht)') || line.includes('Fraktionsübersicht')) {
      /**
       * PLAYERS
       */
      const playerString = line.substring(line.lastIndexOf('--- ') + 4, line.lastIndexOf(', PUID'));
      const playerUUID = line.substring(line.lastIndexOf('PUID ') + 5, line.lastIndexOf('"'));
      addPlayerIfNotExists(playerString, playerUUID);
    }
  });

  for (let i = 0; i < stats.players.length; i++) {
    const playerName = stats.players[i].name;
    stats.players[i]['respawn'] = stats.respawn.filter((res) => res.player === playerName).length;

    stats.players[i]['kill'] = stats.kills.filter(
      (kill) => kill.shooter === playerName && !kill.friendlyFire).length;

    // TODO: use vehicle class description from enum
    stats.players[i]['vehicleLight'] = stats.vehicles.filter(
      (vehicle) => (vehicle.shooter === playerName ||
        (vehicle.additionalShooter && vehicle.additionalShooter.indexOf(playerName)) > -1) && vehicle.vehicleClass ===
        'LIGHT' && VEHICLE_BLACKLIST.indexOf(vehicle.target) < 0).length;

    stats.players[i]['vehicleHeavy'] = stats.vehicles.filter(
      (vehicle) => (vehicle.shooter === playerName ||
        (vehicle.additionalShooter && vehicle.additionalShooter.indexOf(playerName)) > -1) && vehicle.vehicleClass ===
        'HEAVY' && VEHICLE_BLACKLIST.indexOf(vehicle.target) < 0).length;

    stats.players[i]['vehicleAir'] = stats.vehicles.filter(
      (vehicle) => (vehicle.shooter === playerName ||
        (vehicle.additionalShooter && vehicle.additionalShooter.indexOf(playerName)) > -1) && vehicle.vehicleClass ===
        'AIR' && VEHICLE_BLACKLIST.indexOf(vehicle.target) < 0).length;

    stats.players[i]['friendlyFire'] = stats.kills.filter(
      (kill) => kill.shooter === playerName && kill.friendlyFire).length;

    stats.players[i]['death'] = stats.kills.filter((kill) => kill.target === playerName).length;

    stats.players[i]['revive'] = stats.revive.filter((rev) => rev.medic === playerName && !rev.stabilized).length;

    stats.players[i]['flagTouch'] = stats.flag.filter((flag) => flag.player === playerName).length;

    let playerTravelDistance = stats.transport.filter((transport) => transport.passenger === playerName)
                                    .map((transport) => transport.distance)
                                    .reduce((total, num) => total + Math.round(num), 0);
    if (playerTravelDistance > 0) {
      stats.players[i]['travelDistance'] = playerTravelDistance;
    }

    let driverDistance = 0;
    const driverTransports = stats.transport.filter((transport) => transport.driver === playerName);
    for (let i = 0; i < driverTransports.length; i++) {
      const curr = driverTransports[i];
      if (i < driverTransports.length - 1) {
        const next = driverTransports[i + 1];
        if ((next.time.getTime() - curr.time.getTime()) < 2 * 60000) { // only track once in 2 min range
          continue;
        }
        driverDistance += curr.distance;
      } else {
        driverDistance += curr.distance;
      }
    }

    if (driverDistance > 0) {
      stats.players[i]['driverDistance'] = driverDistance;
    }
  }

  stats.war.playersBlufor = stats.players.filter((player) => player.fraction === 'BLUFOR').length;
  stats.war.playersOpfor = stats.players.filter((player) => player.fraction === 'OPFOR').length;

  return stats;
};

const getRespawnEntry = (respawn, playerName, warId, warDate) => {
  return {
    war: warId,
    time: getFullTimeDate(warDate, respawn[5]),
    player: playerName,
  };
};

const getPointsEntry = (pt, line, warId, warDate) => {
  return {
    war: warId,
    time: getFullTimeDate(warDate, pt[5]),
    ptBlufor: parseInt(pt[10]),
    ptOpfor: parseInt(pt[13].slice(0, -2)),
    fraction: line.includes('Kein Dominator') ? 'NONE' : line.includes('NATO +1') ? 'BLUFOR' : 'OPFOR',
  };
};

const getBudgetEntry = (line, budg, warId, warDate) => {
  const timestamp = getFullTimeDate(warDate, budg[5]);
  const oldBudget = transformMoneyString(budg[9]);
  const newBudget = transformMoneyString(budg[12]);
  const fraction = budg[7] === 'NATO' ? 'BLUFOR' : 'OPFOR';

  const budgetEntry = {
    war: warId,
    time: timestamp,
    fraction: fraction,
    oldBudget: oldBudget,
    newBudget: newBudget,
    buy: oldBudget <= newBudget,
  };

  const budgetRespawnMatch = budgetRespawnNameRegex.exec(line);
  if (budgetRespawnMatch && budgetRespawnMatch.length > 1) {
    budgetEntry.player = budgetRespawnMatch[1];
    budgetEntry.item = "Respawn";
  } else {
    const itemNameMatch = budgetItemNameRegex.exec(line);
    const playerNameMatch = budgetPlayerNameRegex.exec(line);
    if (playerNameMatch && playerNameMatch.length > 1) {
      budgetEntry.player = playerNameMatch[1];
    }
    if (itemNameMatch && itemNameMatch.length > 1) {
      budgetEntry.item = itemNameMatch[1];
    }
  }

  return budgetEntry;
};

const getPlayerInfoFromString = (inputString) => {
  const resPlayer = {};
  let playerNameRegexMatch = playerNameRegex.exec(inputString);

  // https://stackoverflow.com/questions/18462784/why-is-javascript-regex-matching-every-second-time
  if (!playerNameRegexMatch) {
    playerNameRegexMatch = playerNameRegex.exec(inputString);
  }
  const sideMatch = sideRegex.exec(inputString);

  // SINGLE PLAYER NAME
  let name;
  if (playerNameRegexMatch && playerNameRegexMatch.length >= 2) {
    name = playerNameRegexMatch[2].trim();
    // do not return player for 'unbekannt' or 'Error: No unit'
    if (!name || name === 'unbekannt' || name === 'Error: No unit' || name === 'Selbstverschulden.') {
      return {name: 'UNKNOWN', fraction: 'NONE'};
    }
    resPlayer.name = name;
  } else {
    return {name: 'UNKNOWN', fraction: 'NONE'};
  }

  // ADDITIONAL PLAYER NAMES
  let additionalPlayerMatch;
  while ((additionalPlayerMatch = playerNameRegex.exec(inputString)) !== null) {
    const addPlayer = additionalPlayerMatch[0].replace(/^,\s/, '').replace(/\s\($/, '').trim();
    if (name instanceof Array) {
      name.push(addPlayer);
    } else {
      name = [name, addPlayer];
    }
  }

  // PLAYER FRACTION
  let side;
  if (sideMatch && sideMatch.length >= 3) {
    side = sideMatch[2];
  } else {
    const inputArray = inputString.split(WHITESPACE);
    if (inputArray) {
      side = inputArray[inputArray.length - 1].replace('(', '').replace(')', '');
    }
  }

  if (side && side !== 'ENEMY') {
    resPlayer.fraction = (side === 'WEST') ? 'BLUFOR' : 'OPFOR';
  }

  // MAGAZINE
  const magazineMatch = magazineRegex.exec(inputString);
  if (magazineMatch && magazineMatch.length >= 3) {
    let magazine = magazineMatch[2];
    if (new RegExp('\\(.*$').test(magazine)) {
      magazine = magazine.concat(')');
    }
    resPlayer.magazine = magazine;
  }

  // VEHICLE
  const vehicleMatch = vehicleRegex.exec(inputString);
  if (vehicleMatch && vehicleMatch.length >= 3 && vehicleMatch[2]) {
    let vehicle = vehicleMatch[2];
    if (new RegExp('\\(.*$').test(vehicle)) {
      vehicle = vehicle.concat(')');
    }
    resPlayer.vehicle = vehicle;
  }

  return resPlayer;
};

const getVehicleAndFractionFromString = (nameClassFractionString) => {
  const sideMatch = sideRegex.exec(nameClassFractionString);
  const categoryMatch = categoryRegex.exec(nameClassFractionString);

  // NAME
  const vehicleName = nameClassFractionString.substring(0,
    nameClassFractionString.indexOf(vehicleNameEndRegex.exec(nameClassFractionString)));

  let fraction;
  if (sideMatch && sideMatch.length >= 3) {
    // SIDE
    const side = sideMatch[2];
    fraction = side === 'OPT_NATO' || side === 'OPT_NATO_T' || side === 'WEST' ? 'BLUFOR' : 'OPFOR';
  }

  let vehicleClassString;
  if (categoryMatch && categoryMatch.length >= 3) {
    // CATEGORY
    vehicleClassString = categoryMatch[2];
  }

  // skip logging here - this is some basic equipment identifier (i.e. parachute)
  if (fraction === 'OPF_F' || fraction === 'BLU_F' || vehicleClassString === VehicleClasses.UNKNOWN) {
    return;
  }

  let vehicleClass;
  for (const key in VehicleClasses) {
    if (VehicleClasses.hasOwnProperty(key) && VehicleClasses[key] === vehicleClassString) {
      vehicleClass = key;
    }
  }

  if (vehicleName && fraction && vehicleClass) {
    return {
      name: vehicleName,
      fraction: fraction,
      vehicleClass: vehicleClass,
    };
  }
};

const transformMoneyString = (budgetString) => {
  if (!budgetString.includes('e+')) {
    return parseInt(budgetString);
  }
  const budget = budgetString.split('e+');
  return Math.round(parseFloat(budget[0]) * Math.pow(10, parseInt(budget[1])));
};

const getFullTimeDate = (date, timeString) => {
  const returnDate = new Date(date);
  const time = timeString.split(':');
  returnDate.setHours(time[0]);
  returnDate.setMinutes(time[1]);
  returnDate.setSeconds(time[2]);
  return returnDate;
};

module.exports = parseWarLog;