/** @type {import('tailwindcss').Config} */
const defaultTheme = require('tailwindcss/defaultTheme');
const plugin = require('tailwindcss/plugin');

// Design system tokens generated from Style Dictionary
const dsTokens = require('./src/theme/generated/tailwind-tokens.js');

// ─── Split-background plugin (from production) ─────────────────────────────

function createSplitBgPlugin() {
  const result = {};
  result['.split-bg'] = {
    background:
      'linear-gradient(90deg, var(--left-color, #000) 50%, var(--right-color, #fff) 50%)',
    '--left-color': '#000',
    '--right-color': '#fff',
  };
  // Use design system palettes for split-bg utilities
  const palettes = dsTokens.colors;
  Object.entries(palettes).forEach(([colorName, shades]) => {
    if (typeof shades !== 'object') return;
    Object.entries(shades).forEach(([shade, value]) => {
      result[`.split-left-${colorName}-${shade}`] = { '--left-color': value };
      result[`.split-right-${colorName}-${shade}`] = { '--right-color': value };
    });
  });
  return result;
}

// ─── Config ─────────────────────────────────────────────────────────────────

module.exports = {
  content: [
    './src/**/*.{js,ts,jsx,tsx,mdx}',
    './.storybook/**/*.{js,ts,jsx,tsx}',
  ],
  safelist: [{ pattern: /^line-clamp-.*/ }],
  theme: {
    // ── Breakpoints (match production + MUI v5/v7 defaults) ──
    screens: {
      xs: '0px',
      sm: '600px',
      md: '960px',
      lg: '1280px',
      xl: '1536px',
    },

    // ── List style types (from production) ──
    listStyleType: {
      none: 'none',
      disc: 'disc',
      circle: 'circle',
      square: 'square',
      decimal: 'decimal',
      roman: 'lower-roman',
      alpha: 'lower-alpha',
    },

    extend: {
      // ── Colours ──
      // Production's colour tokens (preserved for backward compatibility)
      // plus design system semantic palettes
      colors: {
        // --- Production tokens (preserved for backward compatibility) ---
        // DS equivalent noted where applicable; new components should use DS names.
        'grey-1': '#f4f3ef',           // ≈ brand-50 (#fef9f5)
        'grey-2': '#D7E1E2',           // = sage-200
        'grey-3': '#b9c7c9',           // = sage-400
        'grey-4': '#4c5459',           // = sage-800
        'grey-5': '#4c5b6b',           // = sage-700
        'grey-6': '#D9D9D9',           // ≈ neutral-300 (#d4d4d4)
        'grey-7': '#EEEEEE',           // ≈ neutral-100 (#f5f5f5)
        'warning-red': '#A41623',       // ≈ red-600 (#BC2F2F) — darker crimson vs DS warm red
        'color-1': '#B0610F',           // = brand-600
        'color-1H': '#9e6f42',          // No DS match — between brand-500 and brand-600
        'color-2': '#DCC1A6',           // ≈ brand-200 (#EBDAC8) — warmer/darker than DS
        'color-2H': '#d1b79e',          // No DS match — production hover state
        'color-3': '#BA834E',           // = brand-500
        'color-4': '#D0A070',           // = brand-400
        'color-5': '#F4F3EF',           // = grey-1
        'color-6': '#51301B',           // = brand-900
        'action-orange': '#F89E53',     // ≈ amber-400 (#ffb833) — production only
        'success-green': '#76B041',     // ≈ green-500 (#4a8f4a) — lime vs DS forest green

        // --- Design system palettes (from tokens) ---
        ...dsTokens.colors,
      },

      // ── Font families ──
      fontFamily: {
        // Production names
        sans: ['Montserrat', ...defaultTheme.fontFamily.sans],
        arial: ['Arial', 'sans-serif'],
        notoSerifSC: ['"Noto Serif SC"', 'serif'],
        // Design system aliases
        display: dsTokens.fontFamily.display?.split(',').map((f) => f.trim()) || ['"Noto Serif SC"', 'serif'],
        mono: dsTokens.fontFamily.mono?.split(',').map((f) => f.trim()) || defaultTheme.fontFamily.mono,
      },

      // ── Spacing (production custom values + design system scale) ──
      space: {
        8.5: '30px',
      },
      padding: {
        1.25: '5px',
        3.1: '12px',
        3.15: '12.5px',
        3.5: '14px',
        3.75: '15px',
        7.5: '30px',
      },
      margin: {
        1.25: '5px',
        3.1: '12px',
        3.15: '12.5px',
        3.75: '15px',
        7.5: '30px',
      },

      // ── Border width (from production) ──
      borderWidth: {
        3: '3px',
        1.5: '1.5px',
        10: '10px',
      },

      // ── Aspect ratio (from production) ──
      aspectRatio: {
        '16/9': '16 / 9',
        '4/3': '3 / 2',
      },

      // ── Heights (from production) ──
      height: {
        18: '4.5rem',
        22: '5.5rem',
      },
      minHeight: {
        input: 'calc(30px + 1.5rem)',
      },

      // ── Box shadows (from production) ──
      boxShadow: {
        'br-md':
          '8px 0 15px -4px rgba(0, 0, 0, 0.15), 0 8px 15px -4px rgba(0, 0, 0, 0.15)',
        badge: '0 0 5px 4px #f4f3ef',
        'br-sm': '0 4px 6px rgba(0,0,0,0.07)',
      },

      // ── Font sizes ──
      // Production custom sizes
      fontSize: {
        xxs: '10px',
        '1.5xl': '22px',
        '2.15xl': '25px',
        '2.3xl': '26px',
        '3.3xl': '32px',
        // Design system sizes (where they add values not in Tailwind defaults)
        '2xs': dsTokens.fontSize['2xs'],
      },

      // ── Gap (from production) ──
      gap: {
        3.75: '15px',
        7.5: '30px',
      },

      // ── Border radius ──
      borderRadius: {
        // Production
        '1.5xl': '15px',
        // Design system
        ...dsTokens.borderRadius,
      },

      // ── Animation (from production) ──
      animation: {
        logoScroll: 'logoScroll 25s linear infinite',
      },
      keyframes: {
        logoScroll: {
          '0%': { transform: 'translateX(0)' },
          '100%': { transform: 'translateX(-50%)' },
        },
      },

      // ── Line height (design system) ──
      lineHeight: dsTokens.lineHeight,

      // ── Letter spacing (design system) ──
      letterSpacing: dsTokens.letterSpacing,
    },
  },
  plugins: [
    plugin(function ({ addUtilities }) {
      addUtilities(createSplitBgPlugin(), ['responsive']);
    }),
  ],
};