class FSMDocument {

    constructor(name) {
        this.id = guid();
        this.name = null;
        this.createdAt = Date.now();
        this.lastModified = Date.now();
        this.element = null;
        this.unsaved = true;
        this.lastSavedHash = '';
        this.states = [];
        this.connections = [];
    }

    tick() {
        this.states.forEach(stateA => {
            this.states.forEach(stateB => {
                if (stateA !== stateB && stateA.intersects(stateB)) {
                    const inter = stateA.intersection(stateB);
                    const angle1 = stateA.directionTo(stateB);
                    const angle2 = angle1 + Math.PI;

                    const x1 = Math.cos(angle1) * inter + stateA.x;
                    const y1 = Math.sin(angle1) * inter + stateA.y;
                    const x2 = Math.cos(angle2) * inter + stateB.x;
                    const y2 = Math.sin(angle2) * inter + stateB.y;

                    stateA.moveTo(x1, y1);
                    stateB.moveTo(x2, y2);
                }
            });
        });

        this.states.forEach(state => {
            if (state.v) {
                state.moveToStep();
            }
        });

        if(!this.unsaved) {
            if(this.hashCode() !== this.lastSavedHash) {
                this.unsaved = true;
                this.element.classList.add('unsaved');
            }
        }
    }

    draw() {
        this.states.forEach(state => state.draw());
        this.connections.forEach(connection => connection.draw());
    }

    onDblClick(x, y) {
        if (!selectedObject) {
            selectedObject = new State(x, y);
            this.states.push(selectedObject);
            resetCaret();
        } else if (selectedObject instanceof State) {
            selectedObject.isAcceptState = !selectedObject.isAcceptState;
        }
    }

    onRightClick(x, y) {
        if(!selectedObject) {

        }
    }

    deleteCurrentObject() {
        if (!!selectedObject) {
            if (selectedObject instanceof State) {
                this.states.splice(this.states.findIndex(state => state === selectedObject), 1);
            }

            for (let i = 0; i < this.connections.length; i++) {
                const con = this.connections[i];
                if (con === selectedObject || con.state === selectedObject || con.stateA === selectedObject || con.stateB === selectedObject) {
                    this.connections.splice(i--, 1);
                }
            }

            selectedObject = null;
        }
    }

}