import {
  createTailwindMerge,
  getDefaultConfig,
  mergeConfigs,
} from 'tailwind-merge'

import { twMergeConfig } from './merge-config'

/**
 * Unity-configured tailwind-merge function for intelligent CSS class merging.
 *
 * This is a pre-configured version of tailwind-merge that includes Unity's custom
 * class definitions and merge rules. It automatically handles Unity's design tokens
 * including semantic colors, primitive colors, spacing values, typography classes,
 * border radius, shadows, and more.
 * @param classes - CSS class names to merge
 * @returns Merged and deduplicated class string with conflicts resolved
 * @example
 * ```tsx
 * import { uyMerge } from '@payfit/unity-themes'
 *
 * // Basic conflict resolution - last class wins
 * const className = uyMerge('uy:bg-surface-primary-default', 'uy:bg-surface-danger-default')
 * // → 'uy:bg-surface-danger-default'
 *
 * // Spacing conflicts
 * const className = uyMerge('uy:p-100', 'uy:px-200', 'uy:py-300')
 * // → 'uy:p-100 uy:px-200 uy:py-300' (px/py don't conflict with p)
 *
 * const className = uyMerge('uy:p-100', 'uy:p-200')
 * // → 'uy:p-200' (direct conflict resolved)
 *
 * // Typography conflicts
 * const className = uyMerge('uy:typography-h1', 'uy:typography-body')
 * // → 'uy:typography-body'
 *
 * // Complex semantic colors
 * const className = uyMerge(
 *   'uy:bg-surface-primary-default-default',
 *   'uy:bg-surface-primary-default-hover'
 * )
 * // → 'uy:bg-surface-primary-default-hover'
 *
 * // Mixed with standard Tailwind (no conflicts)
 * const className = uyMerge('flex items-center', 'uy:bg-surface-primary-default', 'justify-center')
 * // → 'flex items-center uy:bg-surface-primary-default justify-center'
 *
 * // Responsive and state variants
 * const className = uyMerge(
 *   'uy:bg-surface-neutral-default',
 *   'uy:hover:bg-surface-primary-hover',
 *   'uy:md:bg-surface-secondary-default'
 * )
 * // → 'uy:bg-surface-neutral-default uy:hover:bg-surface-primary-hover uy:md:bg-surface-secondary-default'
 * ```
 * @description
 * **Supported Unity Features:**
 * - **Primitive Colors**: `grayscale-l0`, `red-l5`, `blue-l12`, etc. (pattern: `{color}-l{number}`)
 * - **Semantic Colors**: `surface-primary-default`, `content-neutral-low`, `border-danger-default`, etc.
 * - **Spacing**: All Unity spacing values (`0`, `25`, `50`, `75`, `100`, `125`, `150`, `200`, `250`, `300`, `400`, `500`, `600`, `800`, `1000`)
 * - **Typography**: `h1`, `h2`, `body`, `action`, etc. (generated class names without `-sm` variants)
 * - **Border Radius**: Numeric (`0`, `25`, `50`, etc.) and semantic (`xs`, `sm`, `md`, `lg`, `xl`, `circle`, `pill`)
 * - **Shadows**: Unity shadow values (`canvas`, `raising`, `floating`, `flying`, `soaring`)
 * - **All Utilities**: `bg-*`, `text-*`, `border-*`, `outline-*`, `ring-*`, `divide-*`, `decoration-*`, gradients, etc.
 *
 * **Merge Rules:**
 * - Conflicting classes within the same group are resolved (last one wins)
 * - Non-conflicting classes are preserved
 * - Unity classes don't conflict with standard Tailwind classes
 * - Responsive and state variants are handled correctly
 * - Pattern matching automatically supports new Unity design tokens
 * @see {@link twMergeConfig} for the complete Unity merge configuration
 * @see {@link https://github.com/dcastil/tailwind-merge Tailwind Merge Documentation}
 */
export const uyMerge = createTailwindMerge(() =>
  mergeConfigs(getDefaultConfig(), twMergeConfig),
)