import React, { useState } from 'react';

import {

  View,

  Text,

  StyleSheet,

  ViewStyle,

} from 'react-native';

import Slider from '@react-native-community/slider';

import { useThemeColor } from '@/hooks/use-theme-color';

import { Theme } from '@/constants/theme';

type SliderVariant = 'rich' | 'compact';

interface ScaleSliderProps {

  label: string;

  value: number;

  onValueChange: (value: number) => void;

  min?: number;

  max?: number;

  step?: number;

  minLabel?: string;

  maxLabel?: string;

  icon?: React.ReactNode;      // rich variant only

  showMax?: boolean;           // shows "x/10" format instead of just "x"

  variant?: SliderVariant;

  style?: ViewStyle;

}

export const ScaleSlider: React.FC<ScaleSliderProps> = ({

  label,

  value,

  onValueChange,

  min = 0,

  max = 10,

  step = 1,

  minLabel,

  maxLabel,

  icon,

  showMax,

  variant = 'compact',

  style,

}) => {

  const textColor = useThemeColor({}, 'text');

  const secondaryColor = useThemeColor({}, 'textSecondary');

  const tintColor = useThemeColor({}, 'tint');

  const trackingColor = useThemeColor({}, 'sliderTracking');

  const sliderLabelsColor = useThemeColor({}, 'sliderLabels');

  const isRich = variant === 'rich';

  const valueDisplay = showMax || !isRich

    ? `${value}/${max}`

    : `${value}`;

  return (

    <View style={[styles.container, style]}>

      {/* Header row */}

      <View style={styles.header}>

        <View style={styles.labelRow}>

          {isRich && icon && (

            <View style={styles.iconWrapper}>{icon}</View>

          )}

          <Text style={[

            isRich ? styles.labelRich : styles.labelCompact,

            { color: textColor },

          ]}>

            {label}

          </Text>

        </View>

        <Text style={[

          isRich ? styles.valueRich : styles.valueCompact,

          { color: textColor },

        ]}>

          {valueDisplay}

        </Text>

      </View>

      <View style={{ marginRight: -10, marginLeft: -10 }}>

        {/* Slider */}

        <Slider

          style={styles.slider}

          minimumValue={min}

          maximumValue={max}

          step={step}

          value={value}

          onValueChange={onValueChange}

          minimumTrackTintColor={trackingColor}

          maximumTrackTintColor={trackingColor}

          thumbTintColor={tintColor}

        />

      </View>

      {/* Min / Max labels */}

      {(minLabel || maxLabel) && (

        <View style={styles.rangeLabels}>

          {minLabel && (

            <Text style={[styles.rangeLabel, { color: sliderLabelsColor }]}>

              {minLabel.toUpperCase()}

            </Text>

          )}

          {maxLabel && (

            <Text style={[styles.rangeLabel, { color: sliderLabelsColor }]}>

              {maxLabel.toUpperCase()}

            </Text>

          )}

        </View>

      )}

    </View>

  );

};

// ============================================================================

// STYLES

// ============================================================================

const styles = StyleSheet.create({

  container: {

    width: '100%',

  },

  header: {

    flexDirection: 'row',

    justifyContent: 'space-between',

    alignItems: 'center',

    marginBottom: 4,

  },

  labelRow: {

    flexDirection: 'row',

    alignItems: 'center',

    gap: 8,

  },

  iconWrapper: {

    justifyContent: 'center',

    alignItems: 'center',

  },

  // Rich variant

  labelRich: {

    fontSize: 14,

    fontWeight: 500

  },

  valueRich: {

    fontSize: 18,

    lineHeight: 28,

    fontWeight: 600

  },

  // Compact variant

  labelCompact: {

    fontSize: Theme.typography.bodyLg.fontSize,

  },

  valueCompact: {

    fontSize: Theme.typography.bodyMd.fontSize,

    fontWeight: Theme.typography.bodyMd.fontWeight,

    color: secondaryColor,

  },

  slider: {

    width: '100%',

    height: 40,

  },

  rangeLabels: {

    flexDirection: 'row',

    justifyContent: 'space-between',

    marginTop: -4,

  },

  rangeLabel: {

    ...Theme.typography.labelXs,

    fontWeight: 500,

  },

});