Charts Introduction

"use client";

import * as React from "react";
import * as RechartsPrimitive from "recharts";
import type {
  NameType,
  Payload as TooltipPayload,
  ValueType,
} from "recharts/types/component/DefaultTooltipContent";
import type { Payload as LegendPayload } from "recharts/types/component/DefaultLegendContent";

import { cn } from "~/utils/tailwind";

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-3",
          "[&_.recharts-cartesian-axis-tick_text]:fill-muted-foreground [&_.recharts-cartesian-grid_line]:stroke-border/50 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-none [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-border [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-reference-line-line]:stroke-border [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-sector]:outline-none [&_.recharts-surface]:outline-none",
          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")}
}
`,
        ),
      }}
    />
  );
};

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;

      if (!item) {
        return null;
      }

      const key = `${labelKey ?? item.dataKey ?? item.name ?? "value"}`;
      const itemConfig = getPayloadConfigFromPayload(config, item, key);
      const value =
        !labelKey && typeof label === "string"
          ? config[label]?.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-32 items-start gap-1.5 rounded-1.5 border border-border/50 bg-background px-2.5 py-1.5 text-3",
          className,
        )}
      >
        {!nestLabel ? tooltipLabel : null}
        <div className="grid gap-1.5">
          {payload.map(
            (item: TooltipPayload<ValueType, NameType>, index: number) => {
              const key = `${nameKey ?? item.name ?? item.dataKey ?? "value"}`;
              const itemConfig = getPayloadConfigFromPayload(config, item, key);
              const indicatorColor =
                color ?? (item.payload as { fill: string }).fill ?? item.color;

              return (
                <div
                  key={item.dataKey}
                  className={cn(
                    "flex w-full items-stretch gap-x-2",
                    "[&>svg]:size-2.5 [&>svg]:text-muted-foreground",
                    indicator === "dot" && "items-center",
                  )}
                >
                  {formatter && item.value && item.name ? (
                    formatter(
                      item.value,
                      item.name,
                      item,
                      index,
                      item.payload as TooltipPayload<ValueType, NameType>[],
                    )
                  ) : (
                    <>
                      {itemConfig?.icon ? (
                        <itemConfig.icon />
                      ) : (
                        !hideIndicator && (
                          <div
                            className={cn(
                              "shrink-0 rounded-0.5 border-[--color-border] bg-[--color-bg]",
                              {
                                "size-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(
                          "leading-none flex flex-1 justify-between",
                          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" ? "mb-6" : "mt-6",
          className,
        )}
      >
        {payload.map((item: LegendPayload) => {
          const key = `${nameKey ?? (item.dataKey as string) ?? "value"}`;
          const itemConfig = getPayloadConfigFromPayload(config, item, key);

          return (
            <div
              key={item.value as string}
              className={cn(
                "flex items-center gap-x-1.5",
                "[&>svg]:size-3 [&>svg]:text-muted-foreground",
              )}
            >
              {itemConfig?.icon && !hideIcon ? (
                <itemConfig.icon />
              ) : (
                <div
                  className="size-2 shrink-0 rounded-0.5"
                  style={{
                    backgroundColor: item.color,
                  }}
                />
              )}
              {itemConfig?.label}
            </div>
          );
        })}
      </div>
    );
  },
);
ChartLegendContent.displayName = "ChartLegend";

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];
}

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