import { onUnmounted, onDeactivated, ref } from "vue";
import * as os from "@/os";
import MkChartTooltip from "@/components/MkChartTooltip.vue";

export function useChartTooltip(
    opts: { position: "top" | "middle" } = { position: "top" }
) {
    const tooltipShowing = ref(false);
    const tooltipX = ref(0);
    const tooltipY = ref(0);
    const tooltipTitle = ref(null);
    const tooltipSeries = ref(null);
    let disposeTooltipComponent;

    os.popup(
        MkChartTooltip,
        {
            showing: tooltipShowing,
            x: tooltipX,
            y: tooltipY,
            title: tooltipTitle,
            series: tooltipSeries,
        },
        {}
    ).then(({ dispose }) => {
        disposeTooltipComponent = dispose;
    });

    onUnmounted(() => {
        if (disposeTooltipComponent) disposeTooltipComponent();
    });

    onDeactivated(() => {
        tooltipShowing.value = false;
    });

    function handler(context) {
        if (context.tooltip.opacity === 0) {
            tooltipShowing.value = false;
            return;
        }

        tooltipTitle.value = context.tooltip.title[0];
        tooltipSeries.value = context.tooltip.body.map((b, i) => ({
            backgroundColor: context.tooltip.labelColors[i].backgroundColor,
            borderColor: context.tooltip.labelColors[i].borderColor,
            text: b.lines[0],
        }));

        const rect = context.chart.canvas.getBoundingClientRect();

        tooltipShowing.value = true;
        tooltipX.value =
            rect.left + window.pageXOffset + context.tooltip.caretX;
        if (opts.position === "top") {
            tooltipY.value = rect.top + window.pageYOffset;
        } else if (opts.position === "middle") {
            tooltipY.value =
                rect.top + window.pageYOffset + context.tooltip.caretY;
        }
    }

    return {
        handler,
    };
}