"use strict";

const express = require("express"),
  config = require("config"),
  moment = require("moment"),
  crypto = require("crypto"),
  util = require("util"),
  Promise = require("bluebird"),
  { readFile, writeFile } = require("fs").promises;

let gameDB;

require("../db/games").then(function(db) {
  gameDB = db;
});

const router = express.Router();

function shuffle(array) {
  var currentIndex = array.length, temporaryValue, randomIndex;

  // While there remain elements to shuffle...
  while (0 !== currentIndex) {

    // Pick a remaining element...
    randomIndex = Math.floor(Math.random() * currentIndex);
    currentIndex -= 1;

    // And swap it with the current element.
    temporaryValue = array[currentIndex];
    array[currentIndex] = array[randomIndex];
    array[randomIndex] = temporaryValue;
  }

  return array;
}

const assetData = {
  tiles: [ 
    { type: "wood", y: 0. / 4. },
    { type: "wood", y: 1. / 4. },
    { type: "wood", y: 2. / 4. },
    { type: "wood", y: 3. / 4. },
    { type: "wheat", y: 0. / 4. },
    { type: "wheat", y: 1. / 4. },
    { type: "wheat", y: 2. / 4. },
    { type: "wheat", y: 3. / 4. },
    { type: "stone", y: 0. / 4. },
    { type: "stone", y: 1. / 4. },
    { type: "stone", y: 2. / 4. },
    { type: "sheep", y: 0. / 4. },
    { type: "sheep", y: 1. / 4. },
    { type: "sheep", y: 2. / 4. },
    { type: "sheep", y: 3. / 4. },
    { type: "brick", y: 0. / 4. },
    { type: "brick", y: 1. / 4. },
    { type: "brick", y: 2. / 4. },
    { type: "robber", y: 0 }
  ],
  pips: [
    { roll:  7, pips: 0, y: 3. / 6., x: 0. / 6. },
    { roll:  5, pips: 4, y: 0. / 6., x: 0. / 6. },
    { roll:  2, pips: 1, y: 0. / 6., x: 1. / 6. },
    { roll:  6, pips: 5, y: 0. / 6., x: 2. / 6. },
    { roll:  3, pips: 2, y: 0. / 6., x: 3. / 6. },
    { roll:  8, pips: 5, y: 0. / 6., x: 4. / 6. },
    { roll: 10, pips: 3, y: 0. / 6., x: 5. / 6. },
    { roll:  9, pips: 4, y: 1. / 6., x: 0. / 6. },
    { roll: 12, pips: 1, y: 1. / 6., x: 1. / 6. },
    { roll: 11, pips: 2, y: 1. / 6., x: 2. / 6. },
    { roll:  4, pips: 3, y: 1. / 6., x: 3. / 6. },
    { roll:  8, pips: 5, y: 1. / 6., x: 4. / 6. },
    { roll: 10, pips: 3, y: 1. / 6., x: 5. / 6. },
    { roll:  9, pips: 4, y: 2. / 6., x: 0. / 6. },
    { roll:  4, pips: 3, y: 2. / 6., x: 1. / 6. },
    { roll:  5, pips: 4, y: 2. / 6., x: 2. / 6. },
    { roll:  6, pips: 6, y: 2. / 6., x: 3. / 6. },
    { roll:  3, pips: 2, y: 2. / 6., x: 4. / 6. },
    { roll: 11, pips: 2, y: 2. / 6., x: 5. / 6. }
  ],
  borders: [
    { file: 'borders-1.6.png', left: "sheep", right: "bank" },
    { file: 'borders-2.1.png', center: "sheep" },
    { file: 'borders-3.2.png', left: "wheat", right: "bank" },
    { file: 'borders-4.3.png', center: "wood" },
    { file: 'borders-5.4.png', left: "sheep", right: "bank" },
    { file: 'borders-6.5.png', center: "bank" }
  ],
  developmentCards: []
};
for (let i = 0; i < 14; i++) {
  assetData.developmentCards.push("knight");
}
for (let i = 0; i < 6; i++) {
  assetData.developmentCards.push("progress");
}
for (let i = 0; i < 5; i++) {
  assetData.developmentCards.push("victoryPoint");
}

const games = {};

const roll = (game, player) => {
  let error;
  if (!player) {
    error = "No player active; roll has no action";
    console.log(error);
    return error;
  }

  const name = player.name;

  switch (game.state) {
    case "lobby":
      if (player.order) {
        error = `Player ${name} already rolled for order.`;
        console.log(error);
        return error;
      }
      game.dice = [ Math.ceil(Math.random() * 6) ];
      player.order = game.dice[0];
      const message = `${name} rolled ${game.dice[0]} for play order.`;
      game.chat.push({ date: Date.now(),  message: message });
      console.log(message);
      return;
  }
  
  error = `Invalid game state (${game.state}) in roll.`;
  return error;
}

const loadGame = async (id) => {
  if (/^\.|\//.exec(id)) {
    return undefined;
  }

  if (id in games) {
    return games[id];
  }

  const game = await readFile(`games/${id}`)
  .catch(() => {
    return;
  });

  if (!game) {
    return undefined;
  }

  try {
    games[id] = JSON.parse(game);
  } catch (error) {
    console.error(error, game);
    return null;
  }

  return games[id];
};

router.put("/:id/:action/:value?", async (req, res) => {
  const { action, id, value } = req.params;
  console.log(`PUT games/${id}/${action}/${value}`);

  const game = await loadGame(id);
  if (!game) {
    const error = `Game not found and cannot be created: ${id}`;
    return res.status(404).send(error);
  }

  const color = req.session && req.session.playerColor in game.players ?
    req.session.playerColor : undefined;

  let player;
  let error;
  
  if ('private-token' in req.headers) {
    if (req.headers['private-token'] !== req.app.get('admin')) {
      error = `Invalid admin credentials.`;
    }

    switch (action) {
    case "kick":
      error = `Unable to find player ${value}`
      for (let color in game.players) {
        player = game.players[color];
        if (player.name.toLowerCase() === value.toLowerCase()) {
          console.log(`Kicking ${value} from ${id}.`);
          game.chat.push({
            date: Date.now(),
            message: `${player.name} has been kicked from game.`
          });
          player.session = '';
          player.name = '';
          player.status = 'Not active';
          player.lastActive = 0;
          error = undefined;
          break;
        }
      }
      break;
    }

    return sendGame(res, req, game, error);
  }  
  
  if (action == "player-name") {
    const name = value ? value : "";
    if (color) {
      error = `You cannot change your name while you are in game.`;
    } else {
      if (game) for (let key in game.players) {
        player = game.players[key];
        if (player.name && player.name.toLowerCase() === name.toLowerCase()) {
          error = `${name} is already taken by ${key}`;
        }
      }
    }
  
    if (!error) {
      const old = req.session.playerName ? req.session.PlayerName : "";
      let message;
      req.session.playerName = name;
      if (name) {
        message = `${old} is no known as ${name}.`;
      } else {
        message = `${old} no longer has a name.`;
      }
      game.chat.push({
        date: Date.now(),
        message: message
      });
    }

    return sendGame(res, req, game, error);
  }

  if (action == "player-selected") {
    if (!game) {
      error = `No game found`;
      return sendGame(res, req, game, error);
    }
    
    const selected = req.params.value,
      name = req.session.playerName;

    console.log(`player-selected requested for ${selected} by ${name}`);

    /* Deselect currently active player for this session */
    for (let key in game.players) {
      if (key === color && selected !== key) {
        player = game.players[key];
        if (player.session === req.session.id) {
          player.session = '';
          player.name = '';
          player.status = 'Not active';
          req.session.playerColor = '';
          game.chat.push({
            date: Date.now(),
            message: `${key} is no longer claimed.`
          });
          break;
        }
      }
    }

    /* Verify the player has a name set */
    if (!name) {
      error = `You may only select a player when you have set your name.`;
    }
    
    /* Verify this player's name is not already active in the game */
    if (!error) {
      for (let key in game.players) {
        player = game.players[key];
        if (key === color && selected !== key && player.name == name) {
          error = `This name is already taken by ${key}`;
          break;
        }
      }
    }
    
    /* Verify selection is valid */
    if (!error && !(selected in game.players)) {
      error = `An invalid player selection was attempted.`;
    }

    /* Verify selection is not already taken */
    if (!error) {
      player = game.players[selected];
      if (player.session) {
        error = `${player.name} already has ${selected}`;
      }
    }
    
    /* All good -- set this player to requested selection */
    if (!error) {
      player.session = req.session.id;
      player.name = req.session.playerName;
      player.status = `Active`;
      player.lastActive = Date.now();
      req.session.playerColor = selected;
      game.chat.push({
        date: Date.now(),
        message: `${selected} is now '${player.name}'.`
      });
    }

    return sendGame(res, req, game, error);
  }

  if (!req.session.playerColor ||
    !(req.session.playerColor in game.players)) {
    error = `Invalid player: ${req.session.playerColor}`;
    return sendGame(res, req, game, error);
  }

  player = game.players[req.session.playerColor];
  const name = player.name;

  switch (action) {
  case "roll":
    error = roll(game, player);
    break;
  case "shuffle":
    if (game.state !== "lobby") {
      error = `Game no longer in lobby (${game.state}). Can not shuffle board.`;
    }
    if (!error && game.turns > 0) {
      error = `Game already in progress (${game.turns} so far!) and cannot be shuffled.`;
    }
    if (!error) {
      shuffleBoard(game);
      const message = `${name} requested a new board.`;
      game.chat.push({ date: Date.now(),  message: message });
      console.log(message);
    }
    break
  case "state":
    const state = req.params.value ? req.params.value : "active";
    if (state != game.state) {
      game.state = state;
      const message = `${name} set game state to ${state}.`;
      game.chat.push({ date: Date.now(),  message: message });
    }
    break;
  }

  return sendGame(res, req, game, error);
})

router.get("/:id", async (req, res/*, next*/) => {
  const { id } = req.params;
  console.log("GET games/" + id);
  let error;

  const game = await loadGame(id);
  if (game) {
    return sendGame(res, req, game)
  }

  error = `Game ${id} not found -- returning invalid game state.`;
  const invalid = {
    id: id,
    players: {},
    state: 'invalid'
  };
  return sendGame(res, req, invalid, error);
});

router.put("/:id", (req, res/*, next*/) => {
  console.log("PUT games/" + req.params.id);
  if (req.params.id in games) {
    const game = games[req.params.id],
      changes = req.body;

    console.log(req.session.id, req.session.playerColor);
    console.log(JSON.stringify(changes, null, 2));

    for (let change in changes) {
      switch (change) {
      case "players":
        break;
      case "chat":
        console.log("Chat change.");
        game.chat.push({
          from: changes.chat.player,
          date: Date.now(),
          message: changes.chat.message
        });
        if (game.chat.length > 10) {
          game.chat.splice(0, game.chat.length - 10);
        }
        break;
      }
    }
    return sendGame(res, req, game);
  } else {
    const error = `Game not found: ${req.params.id}`;
    return res.status(404).send(error);
  }
});

const sendGame = async (res, req, game, error) => {
  let active = 0;
  for (let player in game.players) {
    player = game.players[player];
    active += ((player.status && player.status != 'Not active') ? 1 : 0);
  }
  if (active < 2 && game.state != 'lobby' && game.state != 'invalid') {
    let message = "Insufficient players in game. Setting back to lobby."
    game.chat.push({ date: Date.now(),  message: message });
    console.log(message);
    game.state = 'lobby';
  }
  const playerColor = (req.session && req.session.playerColor) ? req.session.playerColor : "",
    playerName = (req.session && req.session.playerName) ? req.session.playerName : "";
  if (playerColor in game.players) {
    game.players[playerColor].lastActive = Date.now();
  }

  await writeFile(`games/${game.id}`, JSON.stringify(game, null, 2))
  .catch((error) => {
    console.error(`Unable to write to games/${game.id}`);
    console.error(error);
  });
  const playerGame = Object.assign({}, game, {
    timestamp: Date.now(),
    status: error ? error : "success",
    activePlayerName: playerName,
    activePlayer: playerColor
  });
  if (game.id == 'b3c4bd15efe212a2') {
//    console.log(req.session);
  }
  return res.status(200).send(playerGame);
}

router.post("/:id?", (req, res/*, next*/) => {
  console.log("POST games/");
  const { id } = req.params;
  if (id && id in games) {
    const error = `Can not create new game for ${id} -- it already exists.`
    console.error(error);
    return res.status(400).send(error);
  }

  const game = {
    startTime: Date.now(),
    turns: 0,
    state: "lobby", /* lobby, in-game, finished */
    tiles: [],
    pips: [],
    borders: [],
    tokens: [],
    players: {
      R: { roads: 15, cities: 4, settlements: 5, points: 0, name: "", status: "Not active" },
      O: { roads: 15, cities: 4, settlements: 5, points: 0, name: "", status: "Not active" },
      B: { roads: 15, cities: 4, settlements: 5, points: 0, name: "", status: "Not active" },
      W: { roads: 15, cities: 4, settlements: 5, points: 0, name: "", status: "Not active" }
    },
    developmentCards: assetData.developmentCards.slice(),
    dice: [ 0, 0 ],
    sheep: 19,
    ore: 19,
    wool: 19,
    brick: 19,
    wheat: 19,
    longestRoad: null,
    largestArmy: null,
    chat: [ { from: "R", date: Date.now(), message: "Server initialized!" } ],
    id: id ? id : crypto.randomBytes(8).toString('hex')
  };

  games[game.id] = game;
  req.session.playerColor = null;
  shuffleBoard(game);
  console.log(`New game created: ${game.id}`);
  return sendGame(res, req, game);
});

const shuffleBoard = (game) => {
  [ "tiles", "pips", "borders" ].forEach((field) => {
    game[field] = []
    for (let i = 0; i < assetData[field].length; i++) {
      game[field].push(i);
    }
    /* Shuffle an array of indexes */
    shuffle(game[field]);
    /* Convert from an index array to a full array */
    for (let i = 0; i < assetData[field].length; i++) {
      game[field][i] = assetData[field][game[field][i]];
    }
  });

  shuffle(game.developmentCards)
}

/*
  return gameDB.sequelize.query("SELECT " +
    "photos.*,albums.path AS path,photohashes.hash,modified,(albums.path || photos.filename) AS filepath FROM photos " +
    "LEFT JOIN albums ON albums.id=photos.albumId " +
    "LEFT JOIN photohashes ON photohashes.photoId=photos.id " +
    "WHERE photos.id=:id", {
    replacements: {
      id: id
    }, type: gameDB.Sequelize.QueryTypes.SELECT,
    raw: true
  }).then(function(photos) {
    if (photos.length == 0) {
      return null;
    }
    */
if (0) {
router.get("/*", (req, res/*, next*/) => {
  return gameDB.sequelize.query(query, {
    replacements: replacements, type: gameDB.Sequelize.QueryTypes.SELECT
  }).then((photos) => {
  });
});
}

module.exports = router;