import React from 'react';
import * as RechartsPrimitive from 'recharts';
import type { NameType, ValueType } from 'recharts/types/component/DefaultTooltipContent';
import { cn } from '@/lib/utils.js';

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

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

interface 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;
}

interface ChartContainerProps
  extends
    Omit<React.ComponentProps<'div'>, 'children'>,
    Pick<
      React.ComponentProps<typeof RechartsPrimitive.ResponsiveContainer>,
      | 'initialDimension'
      | 'aspect'
      | 'debounce'
      | 'minHeight'
      | 'minWidth'
      | 'maxHeight'
      | 'height'
      | 'width'
      | 'onResize'
      | 'children'
    > {
  config: ChartConfig;
  innerResponsiveContainerStyle?: React.ComponentProps<
    typeof RechartsPrimitive.ResponsiveContainer
  >['style'];
}

function ChartContainer({
  id,
  config,
  initialDimension = { width: 320, height: 200 },
  className,
  children,
  ...props
}: Readonly<ChartContainerProps>) {
  const uniqueId = React.useId();
  const chartId = `chart-${id ?? uniqueId.replace(/:/g, '')}`;

  return (
    <ChartContext.Provider value={{ config }}>
      <div
        data-slot="chart"
        data-chart={chartId}
        className={cn(
          "[&_.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-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 flex aspect-video justify-center text-xs [&_.recharts-dot[stroke='#fff']]:stroke-transparent [&_.recharts-layer]:outline-hidden [&_.recharts-sector]:outline-hidden [&_.recharts-sector[stroke='#fff']]:stroke-transparent [&_.recharts-surface]:outline-hidden",
          className,
        )}
        {...props}
      >
        <ChartStyle id={chartId} config={config} />
        <RechartsPrimitive.ResponsiveContainer initialDimension={initialDimension}>
          {children}
        </RechartsPrimitive.ResponsiveContainer>
      </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
      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;

function ChartTooltipContent({
  active,
  payload,
  className,
  indicator = 'dot',
  hideLabel = false,
  hideIndicator = false,
  label,
  labelFormatter,
  labelClassName,
  formatter,
  color,
  nameKey,
  labelKey,
}: React.ComponentProps<typeof RechartsPrimitive.Tooltip> &
  React.ComponentProps<'div'> & {
    hideLabel?: boolean;
    hideIndicator?: boolean;
    indicator?: 'line' | 'dot' | 'dashed';
    nameKey?: string;
    labelKey?: string;
  } & Omit<
    RechartsPrimitive.DefaultTooltipContentProps<ValueType, NameType>,
    'accessibilityLayer'
  >) {
  const { config } = useChart();

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

    const [item] = payload;
    const key = String(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
      className={cn(
        'border-border/50 bg-background grid min-w-[8rem] items-start gap-1.5 rounded-lg border px-2.5 py-1.5 text-xs shadow-xl',
        className,
      )}
    >
      {nestLabel ? null : tooltipLabel}
      <div className="grid gap-1.5">
        {payload
          .filter(item => item.type !== 'none')
          .map((item, index) => {
            const key = String(nameKey ?? item.name ?? item.dataKey ?? 'value');
            const itemConfig = getPayloadConfigFromPayload(config, item, key);
            const indicatorColor = color ?? item.payload?.fill ?? item.color;

            return (
              <div
                key={index}
                className={cn(
                  '[&>svg]:text-muted-foreground flex w-full flex-wrap items-stretch gap-2 [&>svg]:h-2.5 [&>svg]:w-2.5',
                  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 != null && (
                        <span className="text-foreground font-mono font-medium tabular-nums">
                          {typeof item.value === 'number'
                            ? item.value.toLocaleString()
                            : String(item.value)}
                        </span>
                      )}
                    </div>
                  </>
                )}
              </div>
            );
          })}
      </div>
    </div>
  );
}

const ChartLegend = RechartsPrimitive.Legend;

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

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

  return (
    <div
      className={cn(
        'flex items-center justify-center gap-4',
        verticalAlign === 'top' ? 'pb-3' : 'pt-3',
        className,
      )}
    >
      {payload
        .filter(item => item.type !== 'none')
        .map(item => {
          const key = String(nameKey ?? item.dataKey ?? 'value');
          const itemConfig = getPayloadConfigFromPayload(config, item, key);

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