"use client";

import { cn } from "@aur-ui/ui/lib/utils";
import * as React from "react";
import type * as RechartsPrimitive from "recharts";
import type { TooltipValueType } from "recharts";

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

const INITIAL_DIMENSION = { width: 320, height: 200 } as const;
type TooltipNameType = number | string;

function loadRecharts() {
  return import("recharts");
}

const LazyResponsiveContainer = React.lazy(() =>
  loadRecharts().then(({ ResponsiveContainer }) => ({
    default: ResponsiveContainer,
  })),
);

const ChartTooltip = React.lazy(() =>
  loadRecharts().then(({ Tooltip }) => ({ default: Tooltip })),
);

const ChartLegend = React.lazy(() =>
  loadRecharts().then(({ Legend }) => ({ default: Legend })),
);

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

type ChartContextProps = {
  config: ChartConfig;
};

function ChartFallback({
  initialDimension,
}: {
  initialDimension: { width: number; height: number };
}) {
  return (
    <div
      aria-hidden
      style={{
        minWidth: initialDimension.width,
        minHeight: initialDimension.height,
      }}
    />
  );
}

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

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

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

  return context;
}

function ChartContainer({
  id,
  className,
  children,
  config,
  initialDimension = INITIAL_DIMENSION,
  ...props
}: React.ComponentProps<"div"> & {
  config: ChartConfig;
  children: React.ComponentProps<
    typeof RechartsPrimitive.ResponsiveContainer
  >["children"];
  initialDimension?: {
    width: number;
    height: number;
  };
}) {
  const uniqueId = React.useId();
  const chartId = `chart-${id ?? uniqueId.replace(/:/g, "")}`;
  const chartContextValue = React.useMemo(() => ({ config }), [config]);

  return (
    <ChartContext.Provider value={chartContextValue}>
      <div
        data-slot="chart"
        data-chart={chartId}
        className={cn(
          "flex aspect-video justify-center text-xs [&_.recharts-cartesian-axis-tick_text]:fill-ink-500 [&_.recharts-cartesian-grid_line[stroke='#ccc']]:stroke-ink-900/10 [&_.recharts-curve.recharts-tooltip-cursor]:stroke-ink-900/10 [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-hidden [&_.recharts-polar-grid_[stroke='#ccc']]:stroke-ink-900/10 [&_.recharts-radial-bar-background-sector]:fill-ink-wash [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-ink-wash [&_.recharts-reference-line_[stroke='#ccc']]:stroke-ink-900/10 [&_.recharts-sector]:outline-hidden [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-surface]:outline-hidden",
          className,
        )}
        {...props}
      >
        <ChartStyle id={chartId} config={config} />
        <React.Suspense
          fallback={<ChartFallback initialDimension={initialDimension} />}
        >
          <LazyResponsiveContainer initialDimension={initialDimension}>
            {children}
          </LazyResponsiveContainer>
        </React.Suspense>
      </div>
    </ChartContext.Provider>
  );
}

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
      // biome-ignore lint/security/noDangerouslySetInnerHtml: ChartStyle renders typed CSS variables only; values come from config.color.
      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"),
      }}
    />
  );
};

function getVisiblePayloadItems<T extends { type?: string | undefined }>(
  payload: readonly T[] | undefined,
): T[] {
  if (!payload?.length) return [];
  const items: T[] = [];
  for (const item of payload) {
    if (item.type !== "none") items.push(item);
  }
  return items;
}

function ChartTooltipContent({
  active,
  payload,
  className,
  indicator = "dot",
  hideLabel = false,
  hideIndicator = false,
  label,
  labelFormatter,
  labelClassName,
  formatter,
  valueFormatter,
  color,
  nameKey,
  labelKey,
}: React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
  React.ComponentProps<"div"> & {
    hideLabel?: boolean;
    hideIndicator?: boolean;
    indicator?: "line" | "dot" | "dashed";
    nameKey?: string;
    labelKey?: string;
    valueFormatter?: (value: number, name?: string) => string;
  } & Omit<
    RechartsPrimitive.DefaultTooltipContentProps<
      TooltipValueType,
      TooltipNameType
    >,
    "accessibilityLayer"
  >) {
  const { config } = useChart();
  const visiblePayload = getVisiblePayloadItems(payload);

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

  const nestLabel = visiblePayload.length === 1 && indicator !== "dot";
  let tooltipLabel: React.ReactNode = null;

  if (!hideLabel) {
    const [item] = visiblePayload;
    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) {
      tooltipLabel = (
        <div className={cn("font-medium", labelClassName)}>
          {labelFormatter(value, visiblePayload)}
        </div>
      );
    } else if (value) {
      tooltipLabel = (
        <div className={cn("font-medium", labelClassName)}>{value}</div>
      );
    }
  }

  return (
    <div
      className={cn(
        "grid min-w-44 items-start gap-1.5 rounded-overlay bg-surface px-2.5 py-1.5 text-xs text-ink-700 shadow-section",
        className,
      )}
    >
      {!nestLabel ? tooltipLabel : null}
      <div className="grid gap-1.5">
        {visiblePayload.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;
          const payloadKey = [key, item.dataKey, item.name, item.color]
            .filter(Boolean)
            .join("-");

          return (
            <div
              key={payloadKey || key}
              className={cn(
                "flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5 [&>svg]:text-ink-500",
                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-mark border-(--color-border) bg-(--color-bg)",
                          {
                            "h-2.5 w-2.5": indicator === "dot",
                            "w-1": indicator === "line",
                            "w-0 border 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 gap-4 leading-none",
                      nestLabel ? "items-end" : "items-center",
                    )}
                  >
                    <div className="grid gap-1.5">
                      {nestLabel ? tooltipLabel : null}
                      <span className="text-ink-500">
                        {itemConfig?.label ?? item.name}
                      </span>
                    </div>
                    {item.value != null && (
                      <span className="font-mono font-medium text-ink-900 tabular-nums">
                        {typeof item.value === "number"
                          ? valueFormatter
                            ? valueFormatter(
                                item.value,
                                item.name as string | undefined,
                              )
                            : item.value.toLocaleString()
                          : String(item.value)}
                      </span>
                    )}
                  </div>
                </>
              )}
            </div>
          );
        })}
      </div>
    </div>
  );
}

function ChartLegendContent({
  className,
  hideIcon = false,
  payload,
  verticalAlign = "bottom",
  nameKey,
}: React.ComponentProps<"div"> & {
  hideIcon?: boolean;
  nameKey?: string;
} & RechartsPrimitive.DefaultLegendContentProps) {
  const { config } = useChart();
  const visiblePayload = getVisiblePayloadItems(payload);

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

  return (
    <div
      className={cn(
        "flex items-center justify-center gap-4",
        verticalAlign === "top" ? "pb-3" : "pt-3",
        className,
      )}
    >
      {visiblePayload.map((item) => {
        const key = `${nameKey ?? item.dataKey ?? "value"}`;
        const itemConfig = getPayloadConfigFromPayload(config, item, key);
        const payloadKey = [key, item.dataKey, item.value, item.color]
          .filter(Boolean)
          .join("-");

        return (
          <div
            key={payloadKey || key}
            className={cn(
              "flex items-center gap-1.5 [&>svg]:h-3 [&>svg]:w-3 [&>svg]:text-ink-500",
            )}
          >
            {itemConfig?.icon && !hideIcon ? (
              <itemConfig.icon />
            ) : (
              <div
                className="h-2 w-2 shrink-0 rounded-mark"
                style={{
                  backgroundColor: item.color,
                }}
              />
            )}
            {itemConfig?.label}
          </div>
        );
      })}
    </div>
  );
}

// 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];
}

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