<?php
/**
 * Token key -> semantic role -> YOOtheme/UIkit Less variables.
 *
 * This table is the product. Everything else is plumbing: it is what keeps an
 * imported design editable inside YOOtheme's style panel instead of a CSS dump.
 */

namespace Fyoo\FigmaBridge;

class Mapper
{
    /** role => [less variables it drives] */
    public const ROLES = [
        'color.primary'        => ['@global-primary-background'],
        'color.secondary'      => ['@global-secondary-background'],
        'color.background'     => ['@global-background'],
        'color.muted'          => ['@global-muted-background'],
        'color.text'           => ['@global-color'],
        'color.emphasis'       => ['@global-emphasis-color'],
        'color.text-muted'     => ['@global-muted-color'],
        'color.inverse'        => ['@global-inverse-color'],
        'color.link'           => ['@global-link-color'],
        'color.danger'         => ['@global-danger-background'],
        'color.success'        => ['@global-success-background'],
        'color.warning'        => ['@global-warning-background'],
        'color.border'         => ['@global-border'],

        'type.body'            => ['@global-font-family', '@global-font-size', '@global-line-height'],
        'type.small'           => ['@global-small-font-size'],
        'type.lead'            => ['@global-medium-font-size'],
        'type.h1'              => ['@base-h1-font-size'],
        'type.h2'              => ['@base-h2-font-size'],
        'type.h3'              => ['@base-h3-font-size'],
        'type.h4'              => ['@base-h4-font-size'],
        'type.h5'              => ['@base-h5-font-size'],
        'type.h6'              => ['@base-h6-font-size'],

        'space.xsmall'         => ['@global-small-margin'],
        'space.small'          => ['@global-margin'],
        'space.medium'         => ['@global-medium-margin'],
        'space.large'          => ['@global-large-margin'],
        'space.xlarge'         => ['@global-xlarge-margin'],
        'space.gutter'         => ['@global-gutter'],
        'space.section'        => ['@section-padding-vertical'],
        'space.container'      => ['@container-max-width'],

        'radius.default'       => ['@border-rounded-border-radius'],

        'shadow.small'         => ['@global-small-box-shadow'],
        'shadow.medium'        => ['@global-medium-box-shadow'],
        'shadow.large'         => ['@global-large-box-shadow'],
        'shadow.xlarge'        => ['@global-xlarge-box-shadow'],
    ];

    /**
     * Ordered: first pattern that matches a token key wins. Order matters —
     * "text-muted" must be tested before "text", "muted" before "background".
     */
    public const RULES = [
        'color' => [
            '~(^|-)(on-primary|inverse|contrast)(-|$)~'          => 'color.inverse',
            '~(^|-)(text|foreground|fg|ink|content)-(muted|secondary|subtle|tertiary)(-|$)~' => 'color.text-muted',
            '~(^|-)(muted|subtle)-(text|foreground|fg)(-|$)~'    => 'color.text-muted',
            '~(^|-)(heading|title|emphasis|display)(-|$)~'       => 'color.emphasis',
            '~(^|-)(text|foreground|fg|ink|body)(-|$)~'          => 'color.text',
            '~(^|-)link(-|$)~'                                   => 'color.link',
            '~(^|-)(danger|error|destructive|critical|negative)(-|$)~' => 'color.danger',
            '~(^|-)(success|positive|ok)(-|$)~'                  => 'color.success',
            '~(^|-)(warning|caution|alert)(-|$)~'                => 'color.warning',
            '~(^|-)(border|divider|outline|stroke|separator)(-|$)~' => 'color.border',
            '~(^|-)(secondary|brand-2|accent-2)(-|$)~'           => 'color.secondary',
            '~(^|-)(brand-)?(primary|accent|brand)(-|$)~'        => 'color.primary',
            '~(^|-)(muted|subtle|surface-2|neutral-alt)(-|$)~'   => 'color.muted',
            '~(^|-)(surface|background|bg|canvas|base|paper)(-|$)~' => 'color.background',
        ],
        'typography' => [
            '~(^|-)(h1|heading-(xl|1|hero|display))(-|$)~' => 'type.h1',
            '~(^|-)(h2|heading-(lg|2|large))(-|$)~'        => 'type.h2',
            '~(^|-)(h3|heading-(md|3|medium))(-|$)~'       => 'type.h3',
            '~(^|-)(h4|heading-(sm|4|small))(-|$)~'        => 'type.h4',
            '~(^|-)(h5|heading-(xs|5))(-|$)~'              => 'type.h5',
            '~(^|-)(h6|heading-(2xs|6)|overline|eyebrow)(-|$)~' => 'type.h6',
            '~(^|-)(lead|intro|subtitle|body-large)(-|$)~' => 'type.lead',
            '~(^|-)(small|caption|meta|footnote)(-|$)~'    => 'type.small',
            '~(^|-)(body|base|paragraph|text|default)(-|$)~' => 'type.body',
        ],
        'spacing' => [
            '~(^|-)(container|max-width|content|content-width|wrapper|page-width)(-|$)~' => 'space.container',
            '~(^|-)(section|block|stack-xl)(-|$)~'         => 'space.section',
            '~(^|-)(gutter|grid-gap|column-gap|gap)(-|$)~' => 'space.gutter',
            '~(^|-)(3xl|2xl|xxl|xlarge|xl)(-|$)~'          => 'space.xlarge',
            '~(^|-)(large|lg)(-|$)~'                       => 'space.large',
            '~(^|-)(md|medium)(-|$)~'                      => 'space.medium',
            '~(^|-)(xs|xxs|2xs|xsmall)(-|$)~'              => 'space.xsmall',
            '~(^|-)(sm|small|base|default)(-|$)~'          => 'space.small',
        ],
        'radius' => [
            '~(^|-)(default|base|md|medium|card|button|control)(-|$)~' => 'radius.default',
        ],
        'shadow' => [
            '~(^|-)(3xl|2xl|xxl|xlarge|xl)(-|$)~'          => 'shadow.xlarge',
            '~(^|-)(lg|large)(-|$)~'                       => 'shadow.large',
            '~(^|-)(md|medium|default|base|card)(-|$)~'     => 'shadow.medium',
            '~(^|-)(sm|xs|small)(-|$)~'                    => 'shadow.small',
        ],
    ];

    /** Figma component name -> semantic role -> YOOtheme element target. */
    public const COMPONENTS = [
        '~^button\s*/\s*primary~i'   => ['action.primary', 'button-primary'],
        '~^button\s*/\s*secondary~i' => ['action.secondary', 'button-secondary'],
        '~^button~i'                 => ['action.default', 'button-default'],
        '~^card~i'                   => ['content.card', 'card-default'],
        '~^(nav|navbar|header)~i'    => ['navigation.primary', 'navbar'],
        '~^(input|field|form)~i'     => ['form.control', 'form'],
        '~^(alert|notice|banner)~i'  => ['feedback.alert', 'alert'],
        '~^(section|hero)~i'         => ['layout.section', 'section'],
    ];

    private array $overrides;

    /** @param array $overrides token key => role, saved from the admin mapping table */
    public function __construct(array $overrides = [])
    {
        $this->overrides = $overrides;
    }

    public function role(string $group, string $key): ?string
    {
        if (isset($this->overrides[$key])) {
            return $this->overrides[$key] === '-' ? null : $this->overrides[$key];
        }

        foreach (self::RULES[$group] ?? [] as $pattern => $role) {
            if (preg_match($pattern, "-$key-")) {
                return $role;
            }
        }

        return null;
    }

    public function variables(string $role): array
    {
        return self::ROLES[$role] ?? [];
    }

    public function component(string $name): array
    {
        foreach (self::COMPONENTS as $pattern => $mapping) {
            if (preg_match($pattern, $name)) {
                return ['role' => $mapping[0], 'target' => $mapping[1]];
            }
        }

        return ['role' => '', 'target' => ''];
    }

    /**
     * Full resolution table for one token graph: what maps where, and what did not
     * map at all (the admin UI shows these so a human can assign them).
     */
    public function resolve(Tokens $tokens): array
    {
        $mapped = [];
        $unmapped = [];
        $claimed = [];

        foreach (Tokens::GROUPS as $group) {
            foreach ($tokens->group($group) as $key => $value) {
                $role = $this->role($group === 'typography' ? 'typography' : $group, $key);

                // First token to claim a role wins; later ones stay available as raw vars.
                if ($role === null || isset($claimed[$role])) {
                    $unmapped[] = ['group' => $group, 'key' => $key, 'value' => $value, 'reason' => $role ? "role $role already taken" : 'no rule matched'];
                    continue;
                }

                $claimed[$role] = $key;
                $mapped[] = [
                    'group'     => $group,
                    'key'       => $key,
                    'value'     => $value,
                    'role'      => $role,
                    'variables' => $this->variables($role),
                ];
            }
        }

        return ['mapped' => $mapped, 'unmapped' => $unmapped];
    }
}