module SpaceTac.View {
    "use strict";

    // Targetting system
    //  Allows to pick a target for an action
    export class Targetting {
        // Initial target (as pointed by the user)
        target_initial: Game.Target;
        line_initial: Phaser.Graphics;

        // Corrected target (applying action rules)
        target_corrected: Game.Target;
        line_corrected: Phaser.Graphics;

        // Circle for effect radius
        blast_radius: number;
        blast: Phaser.Graphics;

        // Signal to receive hovering events
        targetHovered: Phaser.Signal;

        // Signal to receive targetting events
        targetSelected: Phaser.Signal;

        // Access to the parent battle view
        private battleview: BattleView;

        // Source of the targetting
        private source: PIXI.DisplayObject;

        // Create a default targetting mode
        constructor(battleview: BattleView) {
            this.battleview = battleview;
            this.targetHovered = new Phaser.Signal();
            this.targetSelected = new Phaser.Signal();

            // Visual effects
            if (battleview) {
                this.blast = new Phaser.Graphics(battleview.game, 0, 0);
                this.blast.visible = false;
                battleview.arena.add(this.blast);
                this.line_initial = new Phaser.Graphics(battleview.game, 0, 0);
                this.line_initial.visible = false;
                battleview.arena.add(this.line_initial);
                this.line_corrected = new Phaser.Graphics(battleview.game, 0, 0);
                this.line_corrected.visible = false;
                battleview.arena.add(this.line_corrected);
            }

            this.source = null;
            this.target_initial = null;
            this.target_corrected = null;
        }

        // Destructor
        destroy(): void {
            this.targetHovered.dispose();
            this.targetSelected.dispose();
            if (this.line_initial) {
                this.line_initial.destroy();
            }
            if (this.line_corrected) {
                this.line_corrected.destroy();
            }
            if (this.blast) {
                this.blast.destroy();
            }
        }

        // Update visual effects for current targetting
        update(): void {
            if (this.battleview) {
                if (this.source && this.target_initial) {
                    this.line_initial.clear();
                    this.line_initial.lineStyle(2, 0xFF0000);
                    this.line_initial.moveTo(this.source.x, this.source.y);
                    this.line_initial.lineTo(this.target_initial.x, this.target_initial.y);
                    this.line_initial.visible = true;
                } else {
                    this.line_initial.visible = false;
                }

                if (this.source && this.target_corrected) {
                    this.line_corrected.clear();
                    this.line_corrected.lineStyle(3, 0x00FF00);
                    this.line_corrected.moveTo(this.source.x, this.source.y);
                    this.line_corrected.lineTo(this.target_corrected.x, this.target_corrected.y);
                    this.line_corrected.visible = true;
                } else {
                    this.line_corrected.visible = false;
                }

                if (this.target_corrected && this.blast_radius) {
                    this.blast.clear();
                    this.blast.lineStyle(5, 0x208620, 0.4);
                    this.blast.beginFill(0x60D860, 0.2);
                    this.blast.drawCircle(this.target_corrected.x, this.target_corrected.y, this.blast_radius * 2);
                    this.blast.endFill();
                    this.blast.visible = true;
                } else {
                    this.blast.visible = false;
                }
            }
        }

        // Set the source sprite for the targetting (for visual effects)
        setSource(sprite: PIXI.DisplayObject) {
            this.source = sprite;
        }

        // Set a target from a target object
        setTarget(target: Game.Target, dispatch: boolean = true, blast_radius: number = 0): void {
            this.target_corrected = target;
            this.blast_radius = blast_radius;
            if (dispatch) {
                this.target_initial = target ? Game.Tools.copyObject(target) : null;
                this.targetHovered.dispatch(this.target_corrected);
            }
            this.update();
        }

        // Set no target
        unsetTarget(dispatch: boolean = true): void {
            this.setTarget(null, dispatch);
        }

        // Set the current target ship (when hovered)
        setTargetShip(ship: Game.Ship, dispatch: boolean = true): void {
            this.setTarget(Game.Target.newFromShip(ship), dispatch);
        }

        // Set the current target in space (when hovered)
        setTargetSpace(x: number, y: number, dispatch: boolean = true): void {
            this.setTarget(Game.Target.newFromLocation(x, y));
        }

        // Validate the current target (when clicked)
        //  This will broadcast the targetSelected signal
        validate(): void {
            this.targetSelected.dispatch(this.target_corrected);
        }
    }
}