package main

import (
	"fmt"
	"strconv"
	"strings"
)

type GameStatus int

const (
	StatusLobby = iota
	StatusReady
	StatusPlaying
	StatusStop
	StatusSentinalWin
	StatusScourgeWin
	StatusDraw
)

const (
	SentinalID = 1
	ScourgeID  = 2
)

func (g GameStatus) String() string {
	return []string{"Lobby", "Ready", "Playing", "Stopped"}[g]
}

type Game struct {
	GameBoard      *Board
	SentinalPlayer *Player
	ScourgePlayer  *Player
	SentinalDeck   *Deck
	ScourgeDeck    *Deck
	CurrentTurn    int
	CardBuffer     []Card
	CanDraw        bool
	HasDrawn       bool
	Status         GameStatus
}

func NewGame() *Game {
	deckA := NewDeck()
	deckB := NewDeck()
	deckA.Shuffle()
	deckB.Shuffle()
	return &Game{
		GameBoard:      NewBoard(),
		SentinalPlayer: NewPlayer("Sentinal", SentinalID),
		ScourgePlayer:  NewPlayer("Scourge", ScourgeID),
		SentinalDeck:   deckA,
		ScourgeDeck:    deckB,
		CurrentTurn:    0, //start with no turn
		CardBuffer:     []Card{},
		CanDraw:        false,
		HasDrawn:       false,
		Status:         StatusLobby,
	}
}

func (g *Game) String() string {
	return fmt.Sprintf("Sen(%v): %v\n\n%v\n\nSco(%v): %v\nStatus:%v Draw:%v Turn:%v\n%v\n", g.SentinalPlayer.Life, g.SentinalPlayer.Hand, g.GameBoard, g.ScourgePlayer.Life, g.ScourgePlayer.Hand, g.Status, g.CanDraw, g.CurrentTurn, g.CardBuffer)
}

func (g *Game) Parse(cmd *Command) *CommandResult {

	if g.Status != StatusLobby || g.Status != StatusReady || g.Status != StatusPlaying {
		return &CommandResult{
			PlayerID:     cmd.PlayerID,
			ResultType:   cmd.Type,
			StateResult:  NewView(cmd.PlayerID, g),
			ActionResult: nil,
			DebugResult:  g,
		}
	}

	var state_res *GameView
	var action_res []Card
	var debug_res *Game
	var res_type CmdType

	if cmd.Type == ActCmd {
		action_res = g.PlayerAct(cmd.PlayerID, cmd.Cmd)
		res_type = ActCmd
	} else if cmd.Type == StateCmd {
		state_res = g.PlayerStateAct(cmd.PlayerID, cmd.Cmd)
		res_type = StateCmd
	} else {
		debug_res = g
		res_type = DebugCmd
	}
	g.StateChanges()
	return &CommandResult{
		PlayerID:     cmd.PlayerID,
		ResultType:   res_type,
		StateResult:  state_res,
		ActionResult: action_res,
		DebugResult:  debug_res,
	}
}

func (g *Game) StateChanges() {
	//check for no actions first
	if len(g.SentinalPlayer.Hand) == 0 && g.SentinalDeck.Size() == 0 {
		if g.GameBoard.Empty(SentinalID) {
			g.Status = StatusScourgeWin
		}
	}

	if len(g.ScourgePlayer.Hand) == 0 && g.ScourgeDeck.Size() == 0 {
		if g.GameBoard.Empty(ScourgeID) {
			g.Status = StatusSentinalWin
		}
	}
	//check life
	//this is second on purpose so that it shadows deck out win conditions
	//if you use your last action to win the game, you should actually win
	if g.SentinalPlayer.Life < 0 {
		g.Status = StatusScourgeWin
	}
	if g.ScourgePlayer.Life < 0 {
		g.Status = StatusSentinalWin
	}
	if g.ScourgePlayer.Life < 0 && g.SentinalPlayer.Life < 0 {
		g.Status = StatusDraw
	}
}

func (g *Game) PlayerStateAct(id int, cmd string) *GameView {
	switch cmd {
	case "g":
		//game state
		return NewView(id, g)
	case "b":
		//begin game
		g.Status = StatusReady
		//TODO check for ready on both accounts first
		g.SentinalPlayer.Hand = g.SentinalDeck.Cards[len(g.SentinalDeck.Cards)-5 : len(g.SentinalDeck.Cards)]
		g.SentinalDeck.Cards = g.SentinalDeck.Cards[0 : len(g.SentinalDeck.Cards)-5]
		g.ScourgePlayer.Hand = g.ScourgeDeck.Cards[len(g.ScourgeDeck.Cards)-5 : len(g.ScourgeDeck.Cards)]
		g.SentinalDeck.Cards = g.ScourgeDeck.Cards[0 : len(g.ScourgeDeck.Cards)-5]
	case "s":
		//start turn
		if g.Status == StatusReady { //first turn
			g.Status = StatusPlaying
			g.CurrentTurn = id
			g.CanDraw = false
			g.HasDrawn = true
		} else {
			g.CanDraw = true
			g.HasDrawn = false
		}
		if id != g.CurrentTurn {
			return nil
		}
		if id == SentinalID {
			for _, v := range g.GameBoard.Sentinal {
				v.Upkeep(g)
			}
		} else {
			for _, v := range g.GameBoard.Scourge {
				v.Upkeep(g)
			}
		}
	case "e":
		//end turn and clean up
		if id != g.CurrentTurn {
			return nil
		}
		g.CardBuffer = []Card{}
		if id == SentinalID {
			for _, v := range g.GameBoard.Sentinal {
				v.Endstep(g)
			}
		} else {
			for _, v := range g.GameBoard.Scourge {
				v.Endstep(g)
			}
		}
		if g.CurrentTurn == SentinalID {
			g.CurrentTurn = ScourgeID
		} else {
			g.CurrentTurn = SentinalID
		}
	}
	return NewView(id, g)
}

func (g *Game) PlayerAct(id int, cmd string) []Card {
	if id != g.CurrentTurn {
		return nil
	}
	var curr *Player
	var opp *Player
	var currD *Deck
	if id == g.SentinalPlayer.Id {
		curr = g.SentinalPlayer
		opp = g.ScourgePlayer
		currD = g.SentinalDeck
	} else {
		curr = g.ScourgePlayer
		opp = g.SentinalPlayer
		currD = g.ScourgeDeck
	}
	cmd_s := strings.Split(cmd, " ")
	if len(cmd_s) < 1 {
		return nil
	}
	switch cmd_s[0] {
	case "s":
		//scry: return scry options off top of deck
		if !g.CanDraw || len(g.CardBuffer) > 0 {
			return nil
		}
		g.CardBuffer = currD.Scry(curr.Life)
		return g.CardBuffer
	case "d":
		//draw: return player hand
		if !g.CanDraw {
			return nil
		}
		if len(cmd_s) != 2 || !g.CanDraw {
			return nil
		}
		x_i, err := strconv.Atoi(cmd_s[1])
		if err != nil {
			panic(err)
		}
		x := g.CardBuffer[x_i]
		buf := g.CardBuffer
		for i, v := range buf {
			if v == x {
				buf = append(buf[:i], buf[i+1:]...)
			}
		}
		currD.Bottom(buf)
		curr.Hand = append(curr.Hand, x)
		g.CanDraw = false
		g.HasDrawn = true
		return curr.Hand

	case "m":
		//move: return player board or [] if invalid
		if len(cmd_s) != 3 {
			return nil
		}
		if !g.HasDrawn {
			return nil
		}
		x_i, _ := strconv.Atoi(cmd_s[1])
		y_i, _ := strconv.Atoi(cmd_s[2])
		res := g.GameBoard.Move(g.CurrentTurn, x_i, y_i)
		if res {
			return g.GameBoard.GetRow(g.CurrentTurn)
		} else {
			return []Card{}
		}
	case "a":
		//attack
		if len(cmd_s) != 3 {
			return nil
		}
		if !g.HasDrawn {
			return nil
		}
		x_i, _ := strconv.Atoi(cmd_s[1])
		y_i, _ := strconv.Atoi(cmd_s[2])
		res := g.GameBoard.Attack(g.CurrentTurn, x_i, y_i)
		if res == 1 {
			opp.Life = opp.Life - 1
			return g.GameBoard.GetRow(g.CurrentTurn)
		} else if res == 0 {
			return g.GameBoard.GetRow(g.CurrentTurn)
		} else {
			fmt.Println("can't attack")
			return []Card{}
		}
	case "p":
		//play: return player boad or [] if invalid
		if len(cmd_s) != 3 {
			fmt.Println("not enough arguments")
			return nil
		}
		if !g.HasDrawn {
			return nil
		}
		x_i, _ := strconv.Atoi(cmd_s[1])
		y_i, _ := strconv.Atoi(cmd_s[2])
		card := curr.Hand[x_i]
		if g.GameBoard.CanPlay(g.CurrentTurn, &card, y_i) {
			curr.Hand[x_i].Cast(g)
		}
		res := g.GameBoard.Play(g.CurrentTurn, &card, y_i)
		if res {
			curr.Hand[x_i].Enters(g)
			curr.Hand = append(curr.Hand[:x_i], curr.Hand[x_i+1:]...)
			return g.GameBoard.GetRow(g.CurrentTurn)
		} else {
			fmt.Println("couldn't play")
			return []Card{}
		}
	default:
		fmt.Println("Invalid act command")
		return nil
	}
	return nil
}