'use client';

import type { LegendProps } from 'recharts';
import * as React from 'react';
import { Legend, ResponsiveContainer, Tooltip } from 'recharts';

import { cn } from '@/lib/utils';

// 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.use(ChartContext);

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

  return context;
}

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

  return (
    <ChartContext 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-curve.recharts-tooltip-cursor]:stroke-border [&_.recharts-layer]:outline-none [&_.recharts-radial-bar-background-sector]:fill-muted [&_.recharts-rectangle.recharts-tooltip-cursor]:fill-muted [&_.recharts-sector]:outline-none [&_.recharts-surface]:outline-none',
          className,
        )}
        {...props}
      >
        <ChartStyle id={chartId} config={config} />
        <ResponsiveContainer>
          {children}
        </ResponsiveContainer>
      </div>
    </ChartContext>
  );
};
ChartContainer.displayName = 'Chart';

const ChartTooltip = Tooltip;

const ChartTooltipContent = (
  { ref, active, payload, className, indicator = 'dot', hideLabel = false, hideIndicator = false, label, labelFormatter, labelClassName, formatter, color, nameKey, labelKey }: React.ComponentProps<typeof Tooltip>
    & React.ComponentProps<'div'> & {
      hideLabel?: boolean;
      hideIndicator?: boolean;
      indicator?: 'line' | 'dot' | 'dashed';
      nameKey?: string;
      labelKey?: string;
    } & { ref?: React.RefObject<HTMLDivElement | null> },
) => {
  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
          .filter(item => item.type !== 'none')
          .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 = Legend;

const ChartLegendContent = (
  { ref, className, hideIcon = false, payload, verticalAlign = 'bottom', nameKey }: React.ComponentProps<'div'>
    & Pick<LegendProps, 'payload' | 'verticalAlign'> & {
      hideIcon?: boolean;
      nameKey?: string;
    } & { ref?: React.RefObject<HTMLDivElement | null> },
) => {
  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
        .filter(item => item.type !== 'none')
        .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,
};