<?php

namespace RoosterLMS\UI;

use RoosterLMS\Core\Settings;

defined( 'ABSPATH' ) || exit;

final class Tokens {

	public const DEFAULT_PRIMARY = '#3b82f6';

	public const DEFAULT_SHELL_PAD = 15;

	public const BRANDED_CLASS = 'rooster-lms-org-branded';

	public static function readable_on( string $hex ): string {
		$rgb = self::rgb( $hex );
		if ( null === $rgb ) {
			return '#fff';
		}
		$lum = ( 0.299 * $rgb[0] + 0.587 * $rgb[1] + 0.114 * $rgb[2] ) / 255;
		return $lum > 0.6 ? '#1e1e1e' : '#fff';
	}

	public static function darken( string $hex, int $percent ): string {
		$rgb = self::rgb( $hex );
		if ( null === $rgb ) {
			return '#005177';
		}
		$factor = max( 0, 1 - min( 100, max( 0, $percent ) ) / 100 );
		return sprintf( '#%02x%02x%02x', (int) ( $rgb[0] * $factor ), (int) ( $rgb[1] * $factor ), (int) ( $rgb[2] * $factor ) );
	}

	public static function brand_style( string $hex ): string {
		$hex = (string) sanitize_hex_color( $hex );
		if ( '' === $hex ) {
			return '';
		}
		return '--rl-brand:' . $hex . ';--rl-brand-fg:' . self::readable_on( $hex ) . ';--rl-brand-2:' . self::darken( $hex, 15 );
	}

	public const LOOKS_STYLE = 'rooster-lms-looks';

	private static string $applied = '';

	public static function applied_look(): string {
		return self::$applied;
	}

	public static function forget_look(): void {
		self::$applied = '';
	}

	public static function look_attributes( string $key, string $brand = '' ): array {
		$look = Looks::get( $key );
		if ( null === $look ) {
			$key  = Looks::DEFAULT;
			$look = Looks::get( $key ) ?? array(
				'tokens' => array(),
				'dark'   => false,
				'style'  => '',
			);
		}
		self::$applied = $key;
		$css           = '';
		foreach ( $look['tokens'] as $name => $value ) {
			$css .= $name . ':' . $value . ';';
		}
		if ( Looks::DEFAULT !== $key ) {
			self::enqueue_looks();
			if ( '' !== $look['style'] && wp_style_is( $look['style'], 'registered' ) ) {
				wp_enqueue_style( $look['style'] );
			}
		}
		$style = trim( $brand, ';' );
		$style = '' === $style ? rtrim( $css, ';' ) : ( '' === $css ? $style : $style . ';' . rtrim( $css, ';' ) );
		return array(
			'data-rl-look' => $key,
			'class'        => $look['dark'] ? 'rooster-lms-dark rooster-lms-look-dark' : '',
			'style'        => $style,
		);
	}

	public static function enqueue_looks(): void {
		if ( ! wp_style_is( self::LOOKS_STYLE, 'registered' ) ) {
			Assets::enqueue_part( Assets::UI_BASE );
			wp_register_style( self::LOOKS_STYLE, plugins_url( 'assets/ui/looks.css', ROOSTER_LMS_FILE ), array( Assets::UI_BASE ), Assets::ver( 'looks.css' ) );
		}
		wp_enqueue_style( self::LOOKS_STYLE );
	}

	public static function overrides( bool $admin ): array {
		$out = array();
		$primary = ! $admin && Theme::designs() ? self::DEFAULT_PRIMARY : (string) Settings::get( 'ui_primary' );
		$hex     = (string) sanitize_hex_color( $primary );
		if ( '' !== $hex && strtolower( $hex ) !== self::DEFAULT_PRIMARY ) {
			$out['--rl-primary']         = $hex;
			$out['--rl-primary-fg']      = self::readable_on( $hex );
			$out['--rl-primary-soft']    = 'color-mix(in srgb,' . $hex . ' 14%,#fff)';
			$out['--rl-primary-soft-fg'] = 'color-mix(in srgb,' . $hex . ' 70%,#000)';
		} elseif ( 'theme' === $primary && ! $admin ) {
			$out['--rl-primary'] = 'var(--wp--preset--color--primary,var(--wp--preset--color--accent-1,' . self::DEFAULT_PRIMARY . '))';
			$theme               = self::theme_primary();
			if ( '' !== $theme ) {
				$out['--rl-primary-fg'] = self::readable_on( $theme );
			}
		}
		if ( ! $admin ) {
			$max = (int) Settings::get( 'ui_shell_max' );
			if ( $max > 0 ) {
				$out['--rl-shell-max'] = $max . 'px';
			}
			$pad = (int) Settings::get( 'ui_shell_pad' );
			if ( self::DEFAULT_SHELL_PAD !== $pad ) {
				$out['--rl-shell-pad'] = $pad . 'px';
			}
		}
		$out   = apply_filters( 'rooster_lms_ui_tokens', $out, $admin );
		$clean = array();
		foreach ( is_array( $out ) ? $out : array() as $name => $value ) {
			$name  = (string) $name;
			$value = is_scalar( $value ) ? trim( (string) $value ) : '';
			if ( 1 === preg_match( '/^--rl-[a-z0-9-]+$/', $name ) && '' !== $value && 1 !== preg_match( '/[;{}<>\\\\]|\/\*/', $value ) ) {
				$clean[ $name ] = $value;
			}
		}
		return $clean;
	}

	public static function inline_css( ?bool $admin = null ): string {
		$admin   = $admin ?? is_admin();
		$mapping = $admin ? '' : self::theme_mapping();
		$out     = self::overrides( $admin );
		if ( array() === $out ) {
			return $mapping;
		}
		$css = '';
		foreach ( $out as $name => $value ) {
			$css .= $name . ':' . $value . ';';
		}
		return $mapping . ( '' === $mapping ? ':root' : self::C2_SELECTOR ) . '{' . rtrim( $css, ';' ) . '}';
	}

	public const C2_SELECTOR = ':root,html[data-rooster-scheme="dark"]';

	public const C2_PRESETS = array(
		'--rl-background'        => 'bg',
		'--rl-card'              => 'bg',
		'--rl-tab-active-bg'     => 'bg',
		'--rl-foreground'        => 'fg',
		'--rl-card-fg'           => 'fg',
		'--rl-accent-fg'         => 'fg',
		'--rl-secondary-fg'      => 'fg',
		'--rl-secondary-soft-fg' => 'fg',
		'--rl-mono-soft-fg'      => 'fg',
		'--rl-tab-fg'            => 'fg',
		'--rl-muted-fg'          => 'muted',
		'--rl-tab-edge'          => 'muted',
		'--rl-muted'             => 'subtle',
		'--rl-accent'            => 'subtle',
		'--rl-secondary'         => 'subtle',
		'--rl-secondary-soft'    => 'subtle',
		'--rl-mono-soft'         => 'subtle',
		'--rl-tab-bg'            => 'subtle',
		'--rl-thead-bg'          => 'neutral-50',
		'--rl-row-hover'         => 'neutral-50',
		'--rl-border'            => 'line',
		'--rl-input'             => 'line',
		'--rl-mono'              => 'fg',
		'--rl-mono-fg'           => 'bg',
		'--rl-primary'           => 'accent',
		'--rl-primary-fg'        => 'on-accent',
		'--rl-primary-text'      => 'accent-text',
	);

	public const C2_V2 = array(
		'--rl-shape-button'        => 'var(--wp--custom--rooster--shape--button,var(--rl-radius-md))',
		'--rl-shape-control'       => 'var(--wp--custom--rooster--shape--control,var(--rl-radius-md))',
		'--rl-shape-card'          => 'var(--wp--custom--rooster--shape--card,var(--rl-radius-lg))',
		'--rl-shape-panel'         => 'var(--wp--custom--rooster--shape--panel,var(--rl-radius-lg))',
		'--rl-shape-media'         => 'var(--wp--custom--rooster--shape--media,var(--rl-radius-lg))',
		'--rl-shape-chip'          => 'var(--wp--custom--rooster--shape--chip,var(--rl-radius-pill))',
		'--rl-success'             => 'var(--wp--preset--color--success,#22c55e)',
		'--rl-warning'             => 'var(--wp--preset--color--warning,#facc15)',
		'--rl-destructive'         => 'var(--wp--preset--color--danger,#dc2626)',
		'--rl-tone-success'        => 'var(--wp--preset--color--success,#166534)',
		'--rl-tone-warning'        => 'var(--wp--preset--color--warning,#a16207)',
		'--rl-tone-danger'         => 'var(--wp--preset--color--danger,#b91c1c)',
		'--rl-tone-info'           => 'var(--wp--preset--color--accent,#6d28d9)',
		'--rl-tone-success-fill'   => 'var(--wp--preset--color--success,#22c55e)',
		'--rl-tone-warning-fill'   => 'var(--wp--preset--color--warning,#facc15)',
		'--rl-tone-danger-fill'    => 'var(--wp--preset--color--danger,#ef4444)',
		'--rl-tone-info-fill'      => 'var(--wp--preset--color--accent,#8b5cf6)',
		'--rl-success-soft'        => 'color-mix(in srgb,var(--wp--preset--color--success,#22c55e) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-warning-soft'        => 'color-mix(in srgb,var(--wp--preset--color--warning,#facc15) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-destructive-soft'    => 'color-mix(in srgb,var(--wp--preset--color--danger,#dc2626) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-info-soft'           => 'color-mix(in srgb,var(--wp--preset--color--accent,#8b5cf6) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-success-wash'   => 'color-mix(in srgb,var(--wp--preset--color--success,#22c55e) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-warning-wash'   => 'color-mix(in srgb,var(--wp--preset--color--warning,#facc15) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-danger-wash'    => 'color-mix(in srgb,var(--wp--preset--color--danger,#dc2626) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-info-wash'      => 'color-mix(in srgb,var(--wp--preset--color--accent,#8b5cf6) 12%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-success-pale'   => 'color-mix(in srgb,var(--wp--preset--color--success,#22c55e) 6%,var(--wp--preset--color--bg,#fff))',
		'--rl-tone-danger-pale'    => 'color-mix(in srgb,var(--wp--preset--color--danger,#dc2626) 6%,var(--wp--preset--color--bg,#fff))',
		'--rl-success-soft-fg'     => 'var(--wp--preset--color--fg,#09090b)',
		'--rl-warning-soft-fg'     => 'var(--wp--preset--color--fg,#09090b)',
		'--rl-destructive-soft-fg' => 'var(--wp--preset--color--fg,#09090b)',
		'--rl-info-soft-fg'        => 'var(--wp--preset--color--fg,#09090b)',
		'--rl-primary-soft'        => 'color-mix(in srgb,var(--wp--preset--color--accent,#3b82f6) 10%,var(--wp--preset--color--bg,#fff))',
		'--rl-primary-soft-fg'     => 'var(--wp--preset--color--accent-text,var(--wp--preset--color--accent,#3b82f6))',
		'--rl-track'               => 'var(--rooster-lms-track,var(--wp--preset--color--line,#e4e4e7))',
		'--rl-tone-secondary'      => 'var(--wp--preset--color--muted,#52525b)',
		'--rl-tone-muted'          => 'var(--wp--preset--color--line,#a1a1aa)',
		'--rl-font'                => 'var(--wp--preset--font-family--rooster-body,var(--wp--preset--font-family--body,inherit))',
		'--rl-shadow-sm'           => 'var(--wp--custom--rooster--shadow--sm,0 1px 2px rgba(0,0,0,.05))',
		'--rl-ring'                => 'var(--wp--preset--color--muted,#a1a1aa)',
		'--rl-field-focus'         => 'inset 0 0 0 .5px var(--wp--preset--color--muted,#a1a1aa)',
		'--rl-focus'               => 'var(--wp--custom--rooster--focus-ring,0 0 0 3px rgba(161,161,170,.3))',
		'--rl-check-size'          => 'var(--wp--custom--rooster--field--check,1.25rem)',
		'--rl-shadow-md'           => 'var(--wp--custom--rooster--shadow--md,0 8px 24px rgba(0,0,0,.12))',
	);

	private const C2_FALLBACKS = array(
		'bg'          => '#fff',
		'fg'          => '#09090b',
		'muted'       => '#52525b',
		'subtle'      => '#f4f4f5',
		'neutral-50'  => '#fbfbfc',
		'line'        => '#ececee',
		'accent'      => self::DEFAULT_PRIMARY,
		'on-accent'   => 'var(--wp--preset--color--bg,#fff)',
		'accent-text' => 'var(--wp--preset--color--accent,' . self::DEFAULT_PRIMARY . ')',
	);

	public static function theme_mapping(): string {
		if ( ! Theme::designs() ) {
			return '';
		}
		$css = '';
		foreach ( self::C2_PRESETS as $token => $slug ) {
			$css .= $token . ':var(--wp--preset--color--' . $slug . ',' . self::C2_FALLBACKS[ $slug ] . ');';
		}
		$sizes = '';
		if ( Theme::version( 'C2' ) >= 2 ) {
			foreach ( self::C2_V2 as $token => $value ) {
				$css .= $token . ':' . $value . ';';
			}
			$sizes = 'body:not(.wp-admin) .rooster-lms{--rl-text-base:var(--wp--preset--font-size--md,1rem);--rl-text-sm:var(--wp--preset--font-size--sm,.875rem);--rl-text-xs:var(--wp--preset--font-size--xs,.8125rem);--rl-control-h:var(--wp--custom--rooster--field--height,2.5rem)}';
		}
		return self::C2_SELECTOR . '{' . rtrim( $css, ';' ) . '}' . $sizes;
	}

	public static function body_classes(): array {
		$docks = Theme::declares( 'C11' ) ? array( Dock::THEMED ) : array();
		if ( Theme::designs() ) {
			return array_merge( array( 'rooster-lms-theme-buttons' ), $docks );
		}
		$out  = $docks;
		$dark = (string) Settings::get( 'ui_dark' );
		if ( 'on' === $dark ) {
			$out[] = 'rooster-lms-dark';
		} elseif ( 'auto' === $dark ) {
			$out[] = 'rooster-lms-dark-auto';
		}
		if ( 'theme' === Settings::get( 'ui_buttons' ) ) {
			$out[] = 'rooster-lms-theme-buttons';
		}
		return $out;
	}

	public static function theme_primary(): string {
		$palette = wp_get_global_settings( array( 'color', 'palette', 'theme' ) );
		if ( ! is_array( $palette ) ) {
			return '';
		}
		$found = array();
		foreach ( $palette as $entry ) {
			if ( is_array( $entry ) && isset( $entry['slug'], $entry['color'] ) && is_string( $entry['color'] ) ) {
				$found[ (string) $entry['slug'] ] = (string) sanitize_hex_color( $entry['color'] );
			}
		}
		foreach ( array( 'primary', 'accent-1', 'accent' ) as $slug ) {
			if ( ! empty( $found[ $slug ] ) ) {
				return $found[ $slug ];
			}
		}
		return '';
	}

	private static function rgb( string $hex ): ?array {
		$hex = ltrim( trim( $hex ), '#' );
		if ( 3 === strlen( $hex ) ) {
			$hex = $hex[0] . $hex[0] . $hex[1] . $hex[1] . $hex[2] . $hex[2];
		}
		if ( 6 !== strlen( $hex ) || ! ctype_xdigit( $hex ) ) {
			return null;
		}
		return array( (int) hexdec( substr( $hex, 0, 2 ) ), (int) hexdec( substr( $hex, 2, 2 ) ), (int) hexdec( substr( $hex, 4, 2 ) ) );
	}
}