export class TimeController {
    constructor(store) {
        this.store = store;
        this.lastFrameTime = performance.now();
    }

    tick(now = performance.now()) {
        const deltaMs = now - this.lastFrameTime;
        this.lastFrameTime = now;

        this.store.setState((state) => {
            const realElapsedMs = state.time.realElapsedMs + deltaMs;
            const plotDeltaMs = state.time.paused ? 0 : deltaMs * state.time.speed;

            return {
                ...state,
                time: {
                    ...state.time,
                    realNowMs: Date.now(),
                    realElapsedMs,
                    plotTimeMs: Math.max(0, state.time.plotTimeMs + plotDeltaMs),
                },
            };
        });

        return deltaMs;
    }

    togglePause() {
        this.store.setState((state) => ({
            ...state,
            time: {
                ...state.time,
                paused: !state.time.paused,
            },
        }));
    }

    setPaused(paused) {
        this.store.setState((state) => ({
            ...state,
            time: {
                ...state.time,
                paused,
            },
        }));
    }

    setSpeed(speed) {
        const clampedSpeed = Math.max(0.1, Math.min(12, speed));
        this.store.setState((state) => ({
            ...state,
            time: {
                ...state.time,
                speed: clampedSpeed,
            },
        }));
    }

    reset() {
        this.store.setState((state) => ({
            ...state,
            time: {
                ...state.time,
                realElapsedMs: 0,
                plotTimeMs: 0,
            },
            plot: {
                ...state.plot,
                hoveredPoint: null,
                tooltip: {
                    ...state.plot.tooltip,
                    visible: false,
                    point: null,
                },
            },
        }));
        this.lastFrameTime = performance.now();
    }
}