// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

part of game_component;

class HeartsGameComponent extends GameComponent {
  HeartsGameComponent(Game game, NoArgCb cb, {double width, double height})
      : super(game, cb, width: width, height: height);

  HeartsGameComponentState createState() => new HeartsGameComponentState();
}

class HeartsGameComponentState extends GameComponentState<HeartsGameComponent> {
  List<logic_card.Card> passingCards1 = new List<logic_card.Card>();
  List<logic_card.Card> passingCards2 = new List<logic_card.Card>();
  List<logic_card.Card> passingCards3 = new List<logic_card.Card>();

  HeartsType _lastViewType;

  @override
  void initState() {
    super.initState();
    _reset();
  }

  @override
  void _reset() {
    super._reset();
    HeartsGame game = config.game as HeartsGame;
    _lastViewType = game.viewType;
  }

  @override
  Widget build(BuildContext context) {
    HeartsGame game = config.game as HeartsGame;

    // check if we need to swap out our 's map.
    if (_lastViewType != game.viewType) {
      _reset();
    }

    // Hearts Widget
    Widget heartsWidget = new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.grey[300]),
        child: buildHearts());

    List<Widget> children = new List<Widget>();
    children.add(new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.grey[300]),
        width: config.width,
        height: config.height,
        child: heartsWidget));
    if (game.phase != HeartsPhase.Deal && game.phase != HeartsPhase.Score) {
      List<int> visibleCardCollections = new List<int>();
      int playerNum = game.playerNumber;
      if (game.viewType == HeartsType.Player) {
        switch (game.phase) {
          case HeartsPhase.Pass:
            visibleCardCollections.add(HeartsGame.OFFSET_PASS + playerNum);
            visibleCardCollections.add(HeartsGame.OFFSET_HAND + playerNum);
            break;
          case HeartsPhase.Take:
            visibleCardCollections
                .add(HeartsGame.OFFSET_PASS + game.takeTarget);
            visibleCardCollections.add(HeartsGame.OFFSET_HAND + playerNum);
            break;
          case HeartsPhase.Play:
            visibleCardCollections.add(HeartsGame.OFFSET_HAND + playerNum);
            visibleCardCollections.add(HeartsGame.OFFSET_PLAY + playerNum);
            break;
          default:
            break;
        }
      } else {
        // A board will need to see these things.
        for (int i = 0; i < 4; i++) {
          visibleCardCollections.add(HeartsGame.OFFSET_PLAY + i);
          visibleCardCollections.add(HeartsGame.OFFSET_PASS + i);
          visibleCardCollections.add(HeartsGame.OFFSET_HAND + i);
        }
      }
      children.add(this.buildCardAnimationLayer(visibleCardCollections));
    }

    return new Container(
        width: config.width, height: config.height, child: new Stack(children));
  }

  void _switchViewCallback() {
    HeartsGame game = config.game;
    setState(() {
      if (game.viewType == HeartsType.Player) {
        game.viewType = HeartsType.Board;
      } else {
        game.viewType = HeartsType.Player;
      }
    });
  }

  // Passing between the temporary pass list and the player's hand.
  // Does not actually move anything in game logic terms.
  void _uiPassCardCallback(logic_card.Card card, List<logic_card.Card> dest) {
    setState(() {
      if (passingCards1.contains(card)) {
        passingCards1.remove(card);
      }
      if (passingCards2.contains(card)) {
        passingCards2.remove(card);
      }
      if (passingCards3.contains(card)) {
        passingCards3.remove(card);
      }

      if (dest == passingCards1) {
        passingCards1.clear();
        passingCards1.add(card);
      } else if (dest == passingCards2) {
        passingCards2.clear();
        passingCards2.add(card);
      } else if (dest == passingCards3) {
        passingCards3.clear();
        passingCards3.add(card);
      }
    });
  }

  int _compareCards(logic_card.Card a, logic_card.Card b) {
    if (a == b) return 0;
    assert(a.deck == "classic" && b.deck == "classic");
    HeartsGame game = config.game as HeartsGame;
    int r = game.getCardSuit(a).compareTo(game.getCardSuit(b));
    if (r != 0) return r;
    return game.getCardValue(a) < game.getCardValue(b) ? -1 : 1;
  }

  void _clearPassing() {
    passingCards1.clear();
    passingCards2.clear();
    passingCards3.clear();
  }

  List<logic_card.Card> _combinePassing() {
    List<logic_card.Card> ls = new List<logic_card.Card>();
    ls.addAll(passingCards1);
    ls.addAll(passingCards2);
    ls.addAll(passingCards3);
    return ls;
  }

  // This shouldn't always be here, but for now, we have little choice.
  void _switchPlayersCallback() {
    setState(() {
      config.game.playerNumber = (config.game.playerNumber + 1) % 4;
      _clearPassing(); // Just for sanity.
    });
  }

  void _makeGamePassCallback() {
    setState(() {
      try {
        HeartsGame game = config.game as HeartsGame;
        game.passCards(_combinePassing());
      } catch (e) {
        print("You can't do that! ${e.toString()}");
        config.game.debugString = e.toString();
      }
    });
  }

  void _makeGameTakeCallback() {
    setState(() {
      try {
        // TODO(alexfandrianto): Another way to clear these passing cards is to
        // do so upon the transition from the pass phase to the take phase.
        // However, since they are never seen outside of the Pass phase, it is
        // also valid to clear them upon taking any cards.
        _clearPassing();
        HeartsGame game = config.game as HeartsGame;
        game.takeCards();
      } catch (e) {
        print("You can't do that! ${e.toString()}");
        config.game.debugString = e.toString();
      }
    });
  }

  void _makeGameMoveCallback(logic_card.Card card, List<logic_card.Card> dest) {
    setState(() {
      HeartsGame game = config.game;
      String reason = game.canPlay(game.playerNumber, card);
      if (reason == null) {
        game.move(card, dest);
      } else {
        print("You can't do that! ${reason}");
        game.debugString = reason;
      }
    });
  }

  void _endRoundDebugCallback() {
    setState(() {
      HeartsGame game = config.game as HeartsGame;
      game.jumpToScorePhaseDebug();
    });
  }

  Widget _makeDebugButtons() => new Container(
      width: config.width,
      child: new Flex([
        new Flexible(flex: 1, child: new Text('P${config.game.playerNumber}')),
        new Flexible(
            flex: 5,
            child: _makeButton('Switch Player', _switchPlayersCallback)),
        new Flexible(
            flex: 5, child: _makeButton('Switch View', _switchViewCallback)),
        new Flexible(
            flex: 5, child: _makeButton('End Round', _endRoundDebugCallback)),
        new Flexible(flex: 4, child: _makeButton('Quit', _quitGameCallback))
      ]));

  @override
  Widget _makeButton(String text, NoArgCb callback, {bool inactive: false}) {
    var borderColor = inactive ? Colors.grey[500] : Colors.white;
    var backgroundColor = inactive ? Colors.grey[500] : null;
    return new FlatButton(
        child: new Container(
            decoration: new BoxDecoration(
                border: new Border.all(width: 1.0, color: borderColor),
                backgroundColor: backgroundColor),
            padding: new EdgeDims.all(10.0),
            child: new Text(text)),
        onPressed: inactive ? null : callback);
  }

  Widget buildHearts() {
    HeartsGame game = config.game as HeartsGame;

    if (game.viewType == HeartsType.Board) {
      return buildHeartsBoard();
    }

    switch (game.phase) {
      case HeartsPhase.Deal:
        return showDeal();
      case HeartsPhase.Pass:
        return showPass();
      case HeartsPhase.Take:
        return showTake();
      case HeartsPhase.Play:
        return showPlay();
      case HeartsPhase.Score:
        return showScore();
      default:
        assert(false);
        return null;
    }
  }

  Widget buildHeartsBoard() {
    HeartsGame game = config.game as HeartsGame;
    List<Widget> kids = new List<Widget>();
    switch (game.phase) {
      case HeartsPhase.Deal:
        kids.add(new Text("DEAL PHASE"));
        kids.add(_makeButton('Deal', game.dealCards));
        break;
      case HeartsPhase.Pass:
        kids.add(new Text("PASS PHASE"));
        kids.add(showBoard());
        break;
      case HeartsPhase.Take:
        kids.add(new Text("TAKE PHASE"));
        kids.add(showBoard());
        break;
      case HeartsPhase.Play:
        kids.add(new Text("PLAY PHASE"));
        kids.add(showBoard());
        break;
      case HeartsPhase.Score:
        kids.add(new Text("SCORE PHASE"));
        break;
      default:
        assert(false);
        return null;
    }
    kids.add(_makeDebugButtons());
    return new Column(kids, justifyContent: FlexJustifyContent.spaceBetween);
  }

  Widget showBoard() {
    HeartsGame game = config.game;
    return new HeartsBoard(game,
        width: config.width, height: 0.80 * config.height);
  }

  Widget showPlay() {
    HeartsGame game = config.game as HeartsGame;

    List<Widget> cardCollections = new List<Widget>();

    // Note that this shouldn't normally be shown.
    // Since this is a duplicate card collection, it will not have keyed cards.
    List<Widget> plays = new List<Widget>();
    for (int i = 0; i < 4; i++) {
      plays.add(new CardCollectionComponent(
          game.cardCollections[i + HeartsGame.OFFSET_PLAY],
          true,
          CardCollectionOrientation.show1,
          width: config.width));
    }
    cardCollections.add(new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.teal[600]),
        width: config.width,
        child:
            new Flex(plays, justifyContent: FlexJustifyContent.spaceAround)));

    int p = game.playerNumber;

    Widget playArea = new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.teal[500]),
        width: config.width,
        child: new Center(
            child: new CardCollectionComponent(
                game.cardCollections[p + HeartsGame.OFFSET_PLAY],
                true,
                CardCollectionOrientation.show1,
                useKeys: true,
                acceptCallback: _makeGameMoveCallback,
                acceptType: p == game.whoseTurn ? DropType.card : DropType.none,
                width: config.width,
                backgroundColor:
                    p == game.whoseTurn ? Colors.white : Colors.grey[500],
                altColor: p == game.whoseTurn
                    ? Colors.grey[200]
                    : Colors.grey[600])));
    cardCollections.add(playArea);

    List<logic_card.Card> cards = game.cardCollections[p];
    CardCollectionComponent c = new CardCollectionComponent(
        cards, game.playerNumber == p, CardCollectionOrientation.suit,
        dragChildren: game.whoseTurn == p,
        comparator: _compareCards,
        width: config.width,
        useKeys: true);
    cardCollections.add(c); // flex

    cardCollections.add(new Text("Player ${game.whoseTurn}'s turn"));
    cardCollections.add(new Text(game.debugString));
    cardCollections.add(_makeDebugButtons());

    return new Column(cardCollections,
        justifyContent: FlexJustifyContent.spaceBetween);
  }

  Widget showScore() {
    HeartsGame game = config.game as HeartsGame;

    Widget w;
    if (game.hasGameEnded) {
      w = new Text("Game Over!");
    } else if (game.ready[game.playerNumber]) {
      w = new Text("Waiting for other players...");
    } else {
      w = _makeButton('Ready?', game.setReadyUI);
    }

    return new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.pink[500]),
        child: new Flex([
          new Text('Player ${game.playerNumber}'),
          // TODO(alexfandrianto): we want to show round by round, deltas too, don't we?
          new Text('${game.scores}'),
          w,
          _makeButton("Return to Lobby", _quitGameCallback),
          _makeDebugButtons()
        ], direction: FlexDirection.vertical));
  }

  Widget showDeal() {
    HeartsGame game = config.game as HeartsGame;

    return new Container(
        decoration: new BoxDecoration(backgroundColor: Colors.pink[500]),
        child: new Flex([
          new Text('Player ${game.playerNumber}'),
          _makeButton('Deal', game.dealCards),
          _makeDebugButtons()
        ],
            direction: FlexDirection.vertical,
            justifyContent: FlexJustifyContent.spaceBetween));
  }

  Widget _helpPassTake(
      String name,
      List<logic_card.Card> c1,
      List<logic_card.Card> c2,
      List<logic_card.Card> c3,
      List<logic_card.Card> hand,
      AcceptCb cb,
      NoArgCb buttoncb) {
    HeartsGame game = config.game as HeartsGame;

    bool draggable = (cb != null);
    bool completed = (buttoncb == null);

    List<Widget> topCardWidgets = new List<Widget>();
    topCardWidgets.add(_topCardWidget(c1, cb));
    topCardWidgets.add(_topCardWidget(c2, cb));
    topCardWidgets.add(_topCardWidget(c3, cb));
    topCardWidgets.add(_makeButton(name, buttoncb, inactive: completed));

    Color bgColor = completed ? Colors.teal[600] : Colors.teal[500];

    Widget topArea = new Container(
        decoration: new BoxDecoration(backgroundColor: bgColor),
        padding: new EdgeDims.all(10.0),
        width: config.width,
        child: new Flex(topCardWidgets,
            justifyContent: FlexJustifyContent.spaceBetween));

    Widget handArea = new CardCollectionComponent(
        hand, true, CardCollectionOrientation.suit,
        acceptCallback: cb,
        dragChildren: draggable,
        acceptType: draggable ? DropType.card : null,
        comparator: _compareCards,
        width: config.width,
        backgroundColor: Colors.grey[500],
        altColor: Colors.grey[700],
        useKeys: true);

    return new Column(<Widget>[
      topArea,
      handArea,
      new Text(game.debugString),
      _makeDebugButtons()
    ], justifyContent: FlexJustifyContent.spaceBetween);
  }

  Widget _topCardWidget(List<logic_card.Card> cards, AcceptCb cb) {
    Widget ccc = new CardCollectionComponent(
        cards, true, CardCollectionOrientation.show1,
        acceptCallback: cb,
        dragChildren: cb != null,
        acceptType: cb != null ? DropType.card : null,
        backgroundColor: Colors.white,
        altColor: Colors.grey[200],
        useKeys: true);

    if (cb == null) {
      ccc = new Container(child: ccc);
    }

    return ccc;
  }

  // Pass Phase Screen: Show the cards being passed and the player's remaining cards.
  Widget showPass() {
    HeartsGame game = config.game as HeartsGame;

    List<logic_card.Card> passCards =
        game.cardCollections[game.playerNumber + HeartsGame.OFFSET_PASS];

    List<logic_card.Card> playerCards = game.cardCollections[game.playerNumber];
    List<logic_card.Card> remainingCards = new List<logic_card.Card>();
    playerCards.forEach((logic_card.Card c) {
      if (!passingCards1.contains(c) &&
          !passingCards2.contains(c) &&
          !passingCards3.contains(c)) {
        remainingCards.add(c);
      }
    });

    bool hasPassed = passCards.length != 0;

    return _helpPassTake(
        "Pass",
        passingCards1,
        passingCards2,
        passingCards3,
        remainingCards,
        _uiPassCardCallback,
        hasPassed ? null : _makeGamePassCallback);
  }

  // Take Phase Screen: Show the cards the player has received and the player's hand.
  Widget showTake() {
    HeartsGame game = config.game as HeartsGame;

    List<logic_card.Card> playerCards = game.cardCollections[game.playerNumber];
    List<logic_card.Card> takeCards =
        game.cardCollections[game.takeTarget + HeartsGame.OFFSET_PASS];

    bool hasTaken = takeCards.length == 0;

    List<logic_card.Card> take1 =
        takeCards.length != 0 ? takeCards.sublist(0, 1) : [];
    List<logic_card.Card> take2 =
        takeCards.length != 0 ? takeCards.sublist(1, 2) : [];
    List<logic_card.Card> take3 =
        takeCards.length != 0 ? takeCards.sublist(2, 3) : [];

    return _helpPassTake("Take", take1, take2, take3, playerCards, null,
        hasTaken ? null : _makeGameTakeCallback);
  }
}