"use client";

import * as React from "react";
import * as RechartsPrimitive from "recharts";

import cn from "clsx";

// Format: { THEME_NAME: CSS_SELECTOR }
const THEMES = { light: "", dark: ".dark" } as const;

export type ChartConfig = {
    [k in string]: {
        label?: React.ReactNode;
        icon?: React.ComponentType;
    } & ({ color?: string; theme?: never } | { color?: never; theme: Record<keyof typeof THEMES, string> });
};

type ChartContextProps = {
    config: ChartConfig;
};

const ChartContext = React.createContext<ChartContextProps | null>(null);

function useChart() {
    const context = React.useContext(ChartContext);

    if (!context) {
        throw new Error("useChart must be used within a <ChartContainer />");
    }

    return context;
}

const ChartContainer = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<"div"> & {
        config: ChartConfig;
        children: React.ComponentProps<typeof RechartsPrimitive.ResponsiveContainer>["children"];
    }
>(({ id, className, children, config, ...props }, ref) => {
    const uniqueId = React.useId();
    const chartId = `chart-${id || uniqueId.replace(/:/g, "")}`;

    return (
        <ChartContext.Provider value={{ config }}>
            <div
                data-chart={chartId}
                ref={ref}
                className={cn(
                    "flex aspect-video justify-center text-xs [&_.recharts-cartesian-axis-tick_text]:fill-muted-foreground [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-hidden [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-reference-line_[stroke='#ccc']]:stroke-border [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-sector]:outline-hidden [&_.recharts-surface]:outline-hidden",
                    className
                )}
                {...props}
            >
                <ChartStyle id={chartId} config={config} />
                <RechartsPrimitive.ResponsiveContainer>{children}</RechartsPrimitive.ResponsiveContainer>
            </div>
        </ChartContext.Provider>
    );
});
ChartContainer.displayName = "Chart";

const ChartStyle = ({ id, config }: { id: string; config: ChartConfig }) => {
    const colorConfig = Object.entries(config).filter(([, config]) => config.theme || config.color);

    if (!colorConfig.length) {
        return null;
    }

    return (
        <style
            dangerouslySetInnerHTML={{
                __html: Object.entries(THEMES)
                    .map(
                        ([theme, prefix]) => `
${prefix} [data-chart=${id}] {
${colorConfig
    .map(([key, itemConfig]) => {
        const color = itemConfig.theme?.[theme as keyof typeof itemConfig.theme] || itemConfig.color;
        return color ? `  --color-${key}: ${color};` : null;
    })
    .join("\n")}
}
`
                    )
                    .join("\n"),
            }}
        />
    );
};

const ChartTooltip = RechartsPrimitive.Tooltip;

const ChartTooltipContent = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
        React.ComponentProps<"div"> & {
            hideLabel?: boolean;
            hideIndicator?: boolean;
            indicator?: "line" | "dot" | "dashed";
            nameKey?: string;
            labelKey?: string;
        }
>(
    (
        {
            active,
            payload,
            className,
            indicator = "dot",
            hideLabel = false,
            hideIndicator = false,
            label,
            labelFormatter,
            labelClassName,
            formatter,
            color,
            nameKey,
            labelKey,
        },
        ref
    ) => {
        const { config } = useChart();

        const tooltipLabel = React.useMemo(() => {
            if (hideLabel || !payload?.length) {
                return null;
            }

            const [item] = payload;
            const key = `${labelKey || item.dataKey || item.name || "value"}`;
            const itemConfig = getPayloadConfigFromPayload(config, item, key);
            const value =
                !labelKey && typeof label === "string"
                    ? config[label as keyof typeof config]?.label || label
                    : itemConfig?.label;

            if (labelFormatter) {
                return <div className={cn("font-medium", labelClassName)}>{labelFormatter(value, payload)}</div>;
            }

            if (!value) {
                return null;
            }

            return <div className={cn("font-medium", labelClassName)}>{value}</div>;
        }, [label, labelFormatter, payload, hideLabel, labelClassName, config, labelKey]);

        if (!active || !payload?.length) {
            return null;
        }

        const nestLabel = payload.length === 1 && indicator !== "dot";

        return (
            <div
                ref={ref}
                className={cn(
                    "grid min-w-[8rem] items-start gap-1.5 rounded-lg border border-border/50 bg-background !px-2.5 !py-1.5 text-xs shadow-xl",
                    className
                )}
            >
                {!nestLabel ? tooltipLabel : null}
                <div className="grid gap-1.5">
                    {payload.map((item, index) => {
                        const key = `${nameKey || item.name || item.dataKey || "value"}`;
                        const itemConfig = getPayloadConfigFromPayload(config, item, key);
                        const indicatorColor = color || item.payload.fill || item.color;

                        return (
                            <div
                                key={item.dataKey}
                                className={cn(
                                    "flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5 [&>svg]:text-muted-foreground",
                                    indicator === "dot" && "items-center"
                                )}
                            >
                                {formatter && item?.value !== undefined && item.name ? (
                                    formatter(item.value, item.name, item, index, item.payload)
                                ) : (
                                    <>
                                        {itemConfig?.icon ? (
                                            <itemConfig.icon />
                                        ) : (
                                            !hideIndicator && (
                                                <div
                                                    className={cn(
                                                        "shrink-0 rounded-[2px] border-(--color-border) bg-(--color-bg)",
                                                        {
                                                            "h-2.5 w-2.5": indicator === "dot",
                                                            "w-1": indicator === "line",
                                                            "w-0 border-[1.5px] border-dashed bg-transparent":
                                                                indicator === "dashed",
                                                            "my-0.5": nestLabel && indicator === "dashed",
                                                        }
                                                    )}
                                                    style={
                                                        {
                                                            "--color-bg": indicatorColor,
                                                            "--color-border": indicatorColor,
                                                        } as React.CSSProperties
                                                    }
                                                />
                                            )
                                        )}
                                        <div
                                            className={cn(
                                                "flex flex-1 justify-between leading-none",
                                                nestLabel ? "items-end" : "items-center"
                                            )}
                                        >
                                            <div className="grid gap-1.5">
                                                {nestLabel ? tooltipLabel : null}
                                                <span className="text-muted-foreground">
                                                    {itemConfig?.label || item.name}
                                                </span>
                                            </div>
                                            {item.value && (
                                                <span className="font-mono font-medium tabular-nums text-foreground">
                                                    {item.value.toLocaleString()}
                                                </span>
                                            )}
                                        </div>
                                    </>
                                )}
                            </div>
                        );
                    })}
                </div>
            </div>
        );
    }
);
ChartTooltipContent.displayName = "ChartTooltip";

const ChartLegend = RechartsPrimitive.Legend;

const ChartLegendContent = React.forwardRef<
    HTMLDivElement,
    React.ComponentProps<"div"> &
        Pick<RechartsPrimitive.LegendProps, "payload" | "verticalAlign"> & {
            hideIcon?: boolean;
            nameKey?: string;
        }
>(({ className, hideIcon = false, payload, verticalAlign = "bottom", nameKey }, ref) => {
    const { config } = useChart();

    if (!payload?.length) {
        return null;
    }

    return (
        <div
            ref={ref}
            className={cn(
                "flex items-center justify-center gap-4",
                verticalAlign === "top" ? "pb-3" : "pt-3",
                className
            )}
        >
            {payload.map((item) => {
                const key = `${nameKey || item.dataKey || "value"}`;
                const itemConfig = getPayloadConfigFromPayload(config, item, key);

                return (
                    <div
                        key={item.value}
                        className={cn(
                            "flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3 [&>svg]:text-muted-foreground"
                        )}
                    >
                        {itemConfig?.icon && !hideIcon ? (
                            <itemConfig.icon />
                        ) : (
                            <div
                                className="h-2 w-2 shrink-0 rounded-[2px]"
                                style={{
                                    backgroundColor: item.color,
                                }}
                            />
                        )}
                        {itemConfig?.label}
                    </div>
                );
            })}
        </div>
    );
});
ChartLegendContent.displayName = "ChartLegend";

// Helper to extract item config from a payload.
function getPayloadConfigFromPayload(config: ChartConfig, payload: unknown, key: string) {
    if (typeof payload !== "object" || payload === null) {
        return undefined;
    }

    const payloadPayload =
        "payload" in payload && typeof payload.payload === "object" && payload.payload !== null
            ? payload.payload
            : undefined;

    let configLabelKey: string = key;

    if (key in payload && typeof payload[key as keyof typeof payload] === "string") {
        configLabelKey = payload[key as keyof typeof payload] as string;
    } else if (
        payloadPayload &&
        key in payloadPayload &&
        typeof payloadPayload[key as keyof typeof payloadPayload] === "string"
    ) {
        configLabelKey = payloadPayload[key as keyof typeof payloadPayload] as string;
    }

    return configLabelKey in config ? config[configLabelKey] : config[key as keyof typeof config];
}

export { ChartContainer, ChartLegend, ChartLegendContent, ChartStyle, ChartTooltip, ChartTooltipContent };