//
//  main.swift
//  tetriscli
//
//  Created by Shadowfacts on 10/13/19.
//  Copyright © 2019 Shadowfacts. All rights reserved.
//

import Foundation

class TwoDimString: CustomStringConvertible {
    var width: Int
    var height: Int
    var rows: [String]
    
    var description: String {
        return rows.joined(separator: "\n")
    }
    
    init(width: Int, height: Int) {
        self.width = width
        self.height = height
        self.rows = []
        
        let empty = String(repeating: " ", count: width)
        for _ in 1...height {
            rows.append(empty)
        }
    }
    
    subscript(column: Int, row: Int) -> Character {
        get {
            guard column >= 0 && column < width,
                row >= 0 && row < height else { fatalError("Out of bounds position \(column), \(row) for TwoDimString(width: \(width), height: \(height))") }
            let rowStr = rows[row]
            return rowStr[rowStr.index(rowStr.startIndex, offsetBy: column)]
        }
        set {
            guard column >= 0 && column < width,
                row >= 0 && row < height else { fatalError("Out of bounds position \(column), \(row) for TwoDimString(width: \(width), height: \(height))") }
            let rowStr = rows[row]
            
            rows[row] = String(rowStr.prefix(column)) + String(newValue) + String(rowStr.dropFirst(column + 1))
        }
    }
    
    func setRow(_ row: Int, to str: String) {
        guard row >= 0 && row < height else { fatalError("Can't set row \(row) for TwoDimString(width: \(width), height: \(height))") }
        guard str.count == width else { fatalError("Can't set row with count \(str.count) for TwoDimString(width: \(width), height: \(height))") }
        
        rows[row] = str
    }
    
    func setColumn(_ col: Int, to str: String) {
        guard col >= 0 && col < width else { fatalError("Can't set column \(col) for TwoDimString(width: \(width), height: \(height))") }
        guard str.count == height else { fatalError("Can't set row with count \(str.count) for TwoDimString(width: \(width), height: \(height))") }
        
        for row in 0..<height {
            self[col, row] = str[str.index(str.startIndex, offsetBy: row)]
        }
    }
    
    func setSubString(at column: Int, row: Int, string: TwoDimString) {
        guard column >= 0 && column + string.width <= width,
            row >= 0 && row + string.height <= height else { fatalError("Can't set TwoDimString(width: \(string.width), height: \(string.height)) at (\(column), \(row))") }
        
        for subCol in 0..<string.width {
            for subRow in 0..<string.height {
                self[subCol + column, subRow + row] = string[subCol, subRow]
            }
        }
    }
}

extension TwoDimString {
    convenience init(controller: GameController) {
        self.init(width: controller.width + 2, height: controller.height + 2)
        
        setRow(0, to: "+" + String(repeating: "-", count: controller.width) + "+")
        setRow(controller.height + 1, to: "+" + String(repeating: "-", count: controller.width) + "+")
        setColumn(0, to: "+" + String(repeating: "|", count: controller.height) + "+")
        setColumn(controller.width + 1, to: "+" + String(repeating: "|", count: controller.height) + "+")
        
        for y in 0..<controller.height {
            for x in 0..<controller.width where controller.board[x, y] {
                self[x + 1, y + 1] = "X"
            }
        }
        
        if let currentPiece = controller.currentPiece {
            let (left, top) = currentPiece.topLeft
            for y in 0..<currentPiece.tiles.count where y + top + 1 >= 0 && y + top + 1 < height {
                for x in 0..<currentPiece.tiles.first!.count where x + left + 1 >= 0 && x + left + 1 < width {
                    self[x + left + 1, y + top + 1] = currentPiece.tiles[y][x] ? "X" : "-"
                }
            }
        }
    }
}

let controller = GameController()
controller.start()

func readMove() {
    print(TwoDimString(controller: controller))
    print("Move: ", terminator: "")
    let input = readLine()!.trimmingCharacters(in: .whitespacesAndNewlines)
    
    switch input {
    case "", "s", "step":
        controller.step()
    case "cw":
        controller.rotate(direction: .clockwise)
    case "ccw":
        controller.rotate(direction: .counterClockwise)
    case "l", "left":
        controller.left()
    case "r", "right":
        controller.right()
    case "drop":
        controller.drop()
    case "hold":
        break
    default:
        break
    }
}

while true {
    readMove()
}