go-tetris/boards.go

package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"os"

	"github.com/nsf/termbox-go"
)

// loadBoards loads the internal boards
func loadBoards() error {
	logger.Println("loadBoards start")

	var boardsJSON []BoardsJSON
	err := json.Unmarshal(boardsInternal, &boardsJSON)
	if err != nil {
		return fmt.Errorf("unmarshal error: %v", err)
	}

	numInternalBoards = len(boardsJSON)
	boards = make([]Boards, numInternalBoards)

	for boardNum, boardLoad := range boardsJSON {
		aBoards := Boards{name: boardLoad.Name}
		aBoards.colors = make([][]termbox.Attribute, len(boardLoad.Mino))
		aBoards.rotation = boardLoad.Rotation

		for i := 0; i < len(boardLoad.Mino); i++ {
			aBoards.colors[i] = make([]termbox.Attribute, len(boardLoad.Mino[i]))
			for j := 0; j < len(boardLoad.Mino[i]); j++ {
				switch boardLoad.Mino[i][j] {
				case "b":
					aBoards.colors[i][j] = blankColor
				case "i":
					aBoards.colors[i][j] = termbox.ColorCyan
				case "j":
					aBoards.colors[i][j] = termbox.ColorBlue
				case "l":
					aBoards.colors[i][j] = termbox.ColorWhite
				case "o":
					aBoards.colors[i][j] = termbox.ColorYellow
				case "s":
					aBoards.colors[i][j] = termbox.ColorGreen
				case "t":
					aBoards.colors[i][j] = termbox.ColorMagenta
				case "z":
					aBoards.colors[i][j] = termbox.ColorRed
				}
			}
		}
		boards[boardNum] = aBoards
	}

	boardsJSON = nil

	logger.Println("loadBoards end")

	return nil
}

// loadUserBoards loads the user boards from file
func loadUserBoards() error {
	_, err := os.Stat(baseDir + settingsFileName)
	if os.IsNotExist(err) {
		return nil
	}

	logger.Println("loadUserBoards start")

	if err != nil {
		return fmt.Errorf("stat error: %v", err)
	}

	var settingsJSON []byte
	settingsJSON, err = ioutil.ReadFile(baseDir + settingsFileName)
	if err != nil {
		return fmt.Errorf("read file error: %v", err)
	}
	if len(settingsJSON) < 2 {
		return nil
	}

	var settings Settings
	err = json.Unmarshal(settingsJSON, &settings)
	if err != nil {
		return fmt.Errorf("unmarshal error: %v", err)
	}

	for _, boardLoad := range settings.Boards {
		aBoards := Boards{name: boardLoad.Name}
		aBoards.colors = make([][]termbox.Attribute, len(boardLoad.Mino))
		aBoards.rotation = boardLoad.Rotation

		for i := 0; i < len(boardLoad.Mino); i++ {
			aBoards.colors[i] = make([]termbox.Attribute, len(boardLoad.Mino[i]))
			for j := 0; j < len(boardLoad.Mino[i]); j++ {
				switch boardLoad.Mino[i][j] {
				case "b":
					aBoards.colors[i][j] = blankColor
				case "i":
					aBoards.colors[i][j] = termbox.ColorCyan
				case "j":
					aBoards.colors[i][j] = termbox.ColorBlue
				case "l":
					aBoards.colors[i][j] = termbox.ColorWhite
				case "o":
					aBoards.colors[i][j] = termbox.ColorYellow
				case "s":
					aBoards.colors[i][j] = termbox.ColorGreen
				case "t":
					aBoards.colors[i][j] = termbox.ColorMagenta
				case "z":
					aBoards.colors[i][j] = termbox.ColorRed
				}
			}
		}

		boards = append(boards, aBoards)
	}

	logger.Println("loadUserBoards end")

	return nil
}

// saveUserBoards saves the user boards to file
func saveUserBoards() error {
	logger.Println("saveUserBoards start")

	boardsJSON := make([]BoardsJSON, len(boards)-numInternalBoards)

	for x := numInternalBoards; x < len(boards); x++ {
		aBoards := BoardsJSON{Name: boards[x].name}
		aBoards.Mino = make([][]string, len(boards[x].colors))
		aBoards.Rotation = boards[x].rotation

		for i := 0; i < len(boards[x].colors); i++ {
			aBoards.Mino[i] = make([]string, len(boards[x].colors[i]))
			for j := 0; j < len(boards[x].colors[i]); j++ {
				switch boards[x].colors[i][j] {
				case blankColor:
					aBoards.Mino[i][j] = "b"
				case termbox.ColorCyan:
					aBoards.Mino[i][j] = "i"
				case termbox.ColorBlue:
					aBoards.Mino[i][j] = "j"
				case termbox.ColorWhite:
					aBoards.Mino[i][j] = "l"
				case termbox.ColorYellow:
					aBoards.Mino[i][j] = "o"
				case termbox.ColorGreen:
					aBoards.Mino[i][j] = "s"
				case termbox.ColorMagenta:
					aBoards.Mino[i][j] = "t"
				case termbox.ColorRed:
					aBoards.Mino[i][j] = "z"
				}
			}
		}

		boardsJSON[x-numInternalBoards] = aBoards
	}

	settings := Settings{Boards: boardsJSON}

	settingsJSON, err := json.Marshal(settings)
	if err != nil {
		return fmt.Errorf("marshal error: %v", err)
	}

	err = ioutil.WriteFile(baseDir+settingsFileName, settingsJSON, 0644)
	if err != nil {
		return fmt.Errorf("write file error: %v", err)
	}

	logger.Println("saveUserBoards end")

	return nil
}

var boardsInternal = []byte(`
[
	{
		"name":"10 x 20 blank",
		"mino":[
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"]
		],
		"rotation":[
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
		]
	},
	{
		"name":"10 x 20 checkerboard double",
		"mino":[
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"],
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"],
			["b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z","b","b"],
			["b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z","b","b"],
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"],
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"],
			["b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z","b","b"],
			["b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z","b","b"],
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"],
			["b","b","b","b","b","b","z","z","b","b","z","z","b","b","z","z","b","b","z","z"]
		],
		"rotation":[
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
		]
	},
	{
		"name":"10 x 20 checkerboard single",
		"mino":[
			["b","b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z"],
			["b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b"],
			["b","b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z"],
			["b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b"],
			["b","b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z"],
			["b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b"],
			["b","b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z"],
			["b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b"],
			["b","b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z"],
			["b","b","b","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b","z","b"]
		],
		"rotation":[
			[0,0,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2,0,2],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
		]
	},
	{
		"name":"20 x 20 blank",
		"mino":[
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"]
		],
		"rotation":[
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
		]
	},
	{
		"name":"20 x 20 heart",
		"mino":[
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","l","l","l","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","z","z","t","l","o","o","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","z","z","t","t","t","o","o","j","b","b","b","b","b"],
			["b","b","b","b","b","b","b","l","l","l","i","i","i","i","j","b","b","b","b","b"],
			["b","b","b","b","b","b","b","s","s","l","l","l","z","z","j","j","b","b","b","b"],
			["b","b","b","b","b","b","b","b","s","s","l","z","z","i","i","i","i","b","b","b"],
			["b","b","b","b","b","b","b","b","j","j","l","s","s","t","t","t","z","z","b","b"],
			["b","b","b","b","b","b","b","b","s","j","o","o","s","s","t","z","z","b","b","b"],
			["b","b","b","b","b","b","b","s","s","j","o","o","o","o","l","l","b","b","b","b"],
			["b","b","b","b","b","b","b","s","z","z","s","s","o","o","l","b","b","b","b","b"],
			["b","b","b","b","b","b","b","z","z","t","j","s","s","j","l","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","t","t","j","j","j","j","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","t","j","j","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"],
			["b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b","b"]
		],
		"rotation":[
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,0,1,1,1,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,0,1,1,3,1,0,0,0,0,0,0,0,0],
			[0,0,0,0,0,0,0,1,1,3,3,3,0,0,2,0,0,0,0,0],
			[0,0,0,0,0,0,0,1,1,1,3,3,3,3,2,0,0,0,0,0],
			[0,0,0,0,0,0,0,1,1,1,2,2,1,1,2,2,0,0,0,0],
			[0,0,0,0,0,0,0,0,1,1,2,1,1,1,1,1,1,0,0,0],
			[0,0,0,0,0,0,0,0,0,0,2,1,1,1,1,1,1,1,0,0],
			[0,0,0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0],
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