// @ts-ignore
import {$} from "@fwdekker/template";
import {Display} from "./Display";
import {Field} from "./Field";
import {Solver} from "./Solver";


/**
 * Controls the interaction with a game of Minesweeper.
 */
export class Game {
    private readonly canvas: HTMLCanvasElement;
    private readonly solveForm: HTMLFormElement;
    private readonly controlForm: HTMLFormElement;
    private readonly displayScale: HTMLInputElement;
    private readonly settingsForm: HTMLFormElement;
    private readonly widthInput: HTMLInputElement;
    private readonly heightInput: HTMLInputElement;
    private readonly minesInput: HTMLInputElement;
    private readonly seedInput: HTMLInputElement;
    private field: Field;
    private display: Display;
    private leftDown: boolean;
    private rightDown: boolean;
    private holdsAfterChord: boolean;


    /**
     * Constructs and starts a new game of Minesweeper.
     */
    constructor() {
        this.canvas = $("#canvas");

        this.solveForm = $("#solveForm");
        this.controlForm = $("#controlForm");
        this.displayScale = $("#displayScale");

        this.settingsForm = $("#settingsForm");
        this.widthInput = $("#settingsWidth");
        this.heightInput = $("#settingsHeight");
        this.minesInput = $("#settingsMines");
        this.seedInput = $("#settingsSeed");

        this.field = this.createNewField();
        this.display = new Display(this.canvas, this.field);
        this.display.setScale(+this.displayScale.value);
        this.display.startDrawLoop();

        this.leftDown = false;
        this.rightDown = false;
        this.holdsAfterChord = false;


        this.solveForm.addEventListener(
            "submit",
            event => {
                event.preventDefault();
                new Solver().solve(this.field);
            }
        );
        this.controlForm.addEventListener(
            "submit",
            event => event.preventDefault()
        );
        this.displayScale.addEventListener(
            "change",
            event => {
                event.preventDefault();
                this.display.setScale(+this.displayScale.value);
            }
        );

        this.settingsForm.addEventListener(
            "submit",
            event => {
                event.preventDefault();
                if (+this.widthInput.value * +this.heightInput.value < +this.minesInput.value + 9) {
                    window.alert("Field must contain at least 9 empty squares.")
                    return;
                }

                this.field = this.createNewField();
                this.display.field = this.field;
                this.display.setScale(+this.displayScale.value);
            }
        );
        this.canvas.addEventListener(
            "mousemove",
            event => this.display.mouseSquare = this.display.posToSquare({x: event.clientX, y: event.clientY})
        );
        this.canvas.addEventListener(
            "mouseleave",
            _ => {
                this.display.mouseSquare = null;
                this.leftDown = false;
                this.rightDown = false;
                this.holdsAfterChord = false;
                this.display.mouseHoldChord = false;
            }
        );
        this.canvas.addEventListener(
            "contextmenu",
            event => event.preventDefault()
        );
        this.canvas.addEventListener(
            "mousedown",
            event => {
                event.preventDefault()

                const square = this.display.posToSquare({x: event.clientX, y: event.clientY});
                switch (event.button) {
                    case 0:
                        this.leftDown = true;
                        break;
                    case 2:
                        if (!this.leftDown && square !== null) square.flag();

                        this.rightDown = true;
                        break;
                }

                this.display.mouseHoldChord = this.leftDown && this.rightDown;
            }
        );
        this.canvas.addEventListener(
            "mouseup",
            event => {
                event.preventDefault();

                const square = this.display.posToSquare({x: event.clientX, y: event.clientY});
                switch (event.button) {
                    case 0:
                        if (square !== null && this.leftDown && this.rightDown)
                            square.chord();
                        else if (square !== null && !this.holdsAfterChord && this.leftDown)
                            square.uncover();

                        this.leftDown = false;
                        this.holdsAfterChord = this.rightDown;
                        break;
                    case 1:
                        if (square !== null) square.chord();
                        break;
                    case 2:
                        if (square !== null && this.leftDown && this.rightDown)
                            square.chord();

                        this.rightDown = false;
                        this.holdsAfterChord = this.leftDown;
                        break;
                }

                this.display.mouseHoldChord = this.leftDown && this.rightDown;
            }
        );
    }


    /**
     * Creates a new field according to the current settings.
     *
     * @return the newly created field
     */
    createNewField(): Field {
        return new Field(
            +this.widthInput.value,
            +this.heightInput.value,
            +this.minesInput.value,
            +this.seedInput.value
        );
    }
}