angular.module('kenkenApp')
  .controller('KenkenController', function($scope, $interval, $window, $document, KenkenService, KenkenSolver) {

    var timer;
    var undos;

    function loadValues() {
      var kenken = $window.localStorage.getItem('kenken');
      //console.log('loadValues %O', kenken);
      kenken = JSON.parse(kenken);
      if (!kenken) kenken = {};
      $scope.boardSize = kenken.boardSize || '4';
      $scope.ops = kenken.ops || '+-x/';
      if (kenken.board) {
        $scope.board = kenken.board;
        $scope.cages = kenken.cages;
        $scope.cursor = kenken.cursor || [0, 0];
        $scope.time = kenken.time || 0;
        $scope.showPossibles = kenken.showPossibles == true;
        $scope.solved = KenkenService.isSolved($scope.board);
        undos = kenken.undos || [];
        $scope.solver = KenkenSolver.getSolver($scope);
        if (!$scope.solved) startTimer();
      } else {
        $scope.newBoard();
      }
    }

    function storeValues() {
      var s = $scope;
      var kenken = { boardSize: s.boardSize, ops: s.ops, board: s.board, cages: s.cages, cursor: s.cursor,
        time: s.time, showPossibles: s.showPossibles };
      $window.localStorage.setItem('kenken', JSON.stringify(kenken));
      //console.log('storeValues %O', JSON.stringify(kenken));
    }

    function startTimer() {
      $interval.cancel(timer);
      timer = $interval(function() {
        $scope.time += 1;
        storeValues();
      }, 1000);
    }

    function guess(i, j, x) {
      var b = $scope.board;
      if (x !== b[i][j].guess) {
        undos.push({ action:'guess', i: i, j: j, guess: (b[i][j].guess || '') });
      }
      b[i][j].guess = x;
      storeValues();
      if (KenkenService.isSolved(b)) {
        $interval.cancel(timer);
        $scope.solved = true;
      }
    }
    $scope.guess = guess;

    function peek(i, j) {
      var cell = $scope.board[i][j];
      guess(i, j, cell.ans);
      cell.peeked = true;
    }

    function undo() {
      var u = undos.pop();
      console.log('undo! %O', u);
      if (u) {
        if (u.action === 'guess') {
          $scope.board[u.i][u.j].guess = u.guess;
          $scope.cursor = [u.i, u.j];
        } else if (u.action === 'reset') {
          $scope.board = u.board;
          $scope.time = u.time;
          $scope.solved = KenkenService.isSolved($scope.board);
          if (!$scope.solved) startTimer();
        }
      }
    }

    function resetBoard() {
      undos.push({ action:'reset', time: $scope.time, board: angular.copy($scope.board) });
      $scope.board.forEach(function(row) {
        row.forEach(function(cell) {
            cell.guess = '';
            delete cell.possible;
        });
      });
      $scope.time = 0;
      $scope.solved = false;
      $scope.solver.reset();
      storeValues();
      console.log('reset! undos %O', undos);
    }

    $scope.newBoard = function() {
      console.log('reset board');
      var board = KenkenService.getBoard($scope.boardSize, $scope.ops);
      $scope.board = board.cells;
      $scope.cages = board.cages;
      $scope.cursor = [0,0];
      $scope.time = 0;
      $scope.showPossibles = false;
      $scope.solved = false;
      undos = [];
      $scope.solver = KenkenSolver.getSolver($scope);
      $scope.solver.reset();

      storeValues();
      startTimer();
    };

    $scope.cursorAt = function(i, j) {
      return !$scope.solved && !$scope.cursorHidden && $scope.cursor[0] === i && $scope.cursor[1] === j;
    };

    $scope.setCursor = function(i, j) {
      $scope.cursor = [i, j];
      $scope.cursorHidden = false;
      storeValues();
    };

    $scope.checksRight = function(cell) {
      return $scope.checking && cell.guess && cell.guess === cell.ans;
    };

    $scope.checksWrong = function(cell) {
      return $scope.checking && cell.guess && cell.guess !== cell.ans;
    };

    $scope.cellWalls = function(i, j) {
      return KenkenService.cellWalls($scope.board, i, j);
    };

    $scope.isCursorShadow = function(cell) {
      return $scope.cursorShadow && $scope.cursorShadow.indexOf(cell) > -1;
    };

    $scope.isLit = function(cell) {
      return $scope.lit && $scope.lit.indexOf(cell) > -1;
    };

    $scope.isSoftLit = function(cell) {
      return $scope.softLit && $scope.softLit.indexOf(cell) > -1;
    };

    $scope.keydown = function($event) {
      // console.log('keydown: %d', $event.which);

      var b = $scope.board;
      var n = b.length;
      var c = $scope.cursor;
      var i = c[0], j = c[1];
      var k = $event.which;

      // arrow keys
      if (k === 37) j = (j + n - 1) % n;
      else if (k === 39) j = (j + 1) % n;
      else if (k === 38) i = (i + n - 1) % n;
      else if (k === 40) i = (i + 1) % n;

      $scope.setCursor(i, j);

      // n: new board
      if (k === 78) $scope.newBoard();

      // p: show/hide possible values
      if (k === 80) $scope.showPossibles = !$scope.showPossibles;

      // r: reset board
      if (k === 82) resetBoard();

      // s: attempt to solve
      if (k === 83) {
        $scope.showPossibles = true;
        if ($event.shiftKey) $scope.solver.step();
        else $scope.solver.solve();
      }

      if ($scope.solved) return;

      // numbers: set guess, or alter possibilities
      if (k - 48 >= 1 && k - 48 <= n) {
        var value = k - 48;
        var possible = b[i][j].possible;
        if ($event.shiftKey) {
          if (!possible[value]) {
            possible[value] = true;
            possible[0]++;
          }
        } else if ($event.altKey) {
          if (possible[value]) {
            possible[value] = false;
            possible[0]--;
          }
        } else {
          guess(i, j, value);
        }
      }


      // space: erase guess
      else if (k === 32) guess(i, j, '');

      // return: check guesses
      else if (k === 13) $scope.checking = true;

      // ?: peek
      else if (k === 191 && $event.shiftKey) peek(i, j);

      // esc: undo
      else if (k === 27) undo();


    };

    $scope.keyup = function($event) {
      if ($scope.solved) return;
      var k = $event.which;
      if (k === 13) $scope.checking = false;
    };

    $document.ready(function() { $document[0].getElementById('board').focus(); });

    // TODO: move to filter
    $scope.timerSeconds = function() {
      var t = $scope.time;
      var hours   = Math.floor(t / 3600);
      var minutes = Math.floor((t - (hours * 3600)) / 60);
      var seconds = t - (hours * 3600) - (minutes * 60);

      if (hours   < 10) {hours   = "0"+hours;}
      if (minutes < 10 && hours > 0) {minutes = "0"+minutes;}
      if (seconds < 10) {seconds = "0"+seconds;}
      var time    = hours+':'+minutes+':'+seconds;
      return time;
    };

    loadValues();

  });