<?php

namespace RoosterLMS\UI;

use RoosterLMS\Core\Settings;
use RoosterLMS\Orgs\Org;

defined( 'ABSPATH' ) || exit;

final class Looks {

	public const DEFAULT = 'rooster-one';

	public const KEY = '/^[a-z0-9-]{1,64}$/';

	private static array $all = array();

	public static function all(): array {
		$locale = (string) get_locale();
		if ( isset( self::$all[ $locale ] ) ) {
			return self::$all[ $locale ];
		}
		$free = array(
			self::DEFAULT         => array(
				'label'       => __( 'Rooster One', 'rooster-lms' ),
				'description' => __( 'Light and clear: the standard look.', 'rooster-lms' ),
				'tokens'      => array(),
				'dark'        => false,
				'style'       => '',
				'swatches'    => array( '#ffffff', '#3b82f6', '#09090b' ),
				'layout'      => 'default',
			),
			'rooster-one-dark'    => array(
				'label'       => __( 'Rooster One Dark', 'rooster-lms' ),
				'description' => __( 'Light text on dark backgrounds.', 'rooster-lms' ),
				'tokens'      => array(),
				'dark'        => true,
				'style'       => '',
				'swatches'    => array( '#09090b', '#2563eb', '#fafafa' ),
				'layout'      => 'default',
			),
			'rooster-one-compact' => array(
				'label'       => __( 'Rooster One Compact', 'rooster-lms' ),
				'description' => __( 'Denser lists and smaller controls, for people who work with many rows.', 'rooster-lms' ),
				'tokens'      => array(
					'--rl-control-h'    => '32px',
					'--rl-control-h-sm' => '24px',
					'--rl-space-3'      => '8px',
					'--rl-space-4'      => '12px',
					'--rl-table-pad-y'  => '6px',
				),
				'dark'        => false,
				'style'       => '',
				'swatches'    => array( '#ffffff', '#3b82f6', '#71717a' ),
				'layout'      => 'default',
			),
		);
		$looks = apply_filters( 'rooster_lms_ui_templates', $free );
		$out   = array();
		foreach ( is_array( $looks ) ? $looks : $free as $key => $look ) {
			$clean = is_string( $key ) && 1 === preg_match( self::KEY, $key ) && is_array( $look ) ? self::clean( $look ) : null;
			if ( null !== $clean ) {
				$out[ $key ] = $clean;
			}
		}
		if ( ! isset( $out[ self::DEFAULT ] ) ) {
			$out = array( self::DEFAULT => $free[ self::DEFAULT ] ) + $out;
		}
		self::$all[ $locale ] = $out;
		return $out;
	}

	public static function get( string $key ): ?array {
		return self::all()[ $key ] ?? null;
	}

	public static function exists( string $key ): bool {
		return isset( self::all()[ $key ] );
	}

	public static function for_builder(): array {
		$out = array();
		foreach ( self::all() as $key => $look ) {
			$out[] = array(
				'key'         => $key,
				'label'       => $look['label'],
				'description' => $look['description'],
				'swatches'    => $look['swatches'],
			);
		}
		return $out;
	}

	public static function for_viewer( Org $org, int $user_id, ?array $tree = null ): string {
		$settings = $org->settings;
		$unit     = $user_id > 0 ? \RoosterLMS\Orgs\OrgScope::for_user( $user_id )->member_unit( $org->id ) : 0;
		$ar = \RoosterLMS\Orgs\ApparentRoot::unit_in( $org->id );
		if ( $ar > 0 && ( $unit <= 0 || ! \RoosterLMS\Orgs\ApparentRoot::in_branch( $org->id, $unit ) ) ) {
			$unit = $ar;
		}
		$candidates = array();
		if ( $unit > 0 && $settings->unit_looks ) {
			$repo = \RoosterLMS\Domain\Services::unit_settings();
			if ( null !== $tree ) {
				$parents = array();
				foreach ( $tree as $id => $row ) {
					if ( $row instanceof \RoosterLMS\Orgs\OrgUnit ) {
						$parents[ $row->id ] = $row->parent_id;
					} elseif ( is_int( $row ) || ( is_string( $row ) && ctype_digit( $row ) ) ) {
						$parents[ (int) $id ] = (int) $row;
					}
				}
				$looks = $repo->looks( $org->id );
				$seen  = array();
				for ( $id = $unit; $id > 0 && ! isset( $seen[ $id ] ); $id = (int) ( $parents[ $id ] ?? 0 ) ) {
					$seen[ $id ] = true;
					if ( isset( $looks[ $id ] ) ) {
						$candidates[] = $looks[ $id ];
					}
				}
			} else {
				$near = $repo->look_of( $unit );
				if ( '' !== $near ) {
					$candidates[] = $near;
				}
				if ( '' !== $near && ! self::exists( $near ) ) {
					$looks = $repo->looks( $org->id );
					foreach ( array_reverse( \RoosterLMS\Domain\Services::org_unit_repo()->ancestor_ids( $unit ) ) as $id ) {
						if ( isset( $looks[ (int) $id ] ) ) {
							$candidates[] = $looks[ (int) $id ];
						}
					}
				}
			}
		}
		$candidates[] = $settings->ui_template;
		$candidates[] = self::site();
		$key          = self::DEFAULT;
		foreach ( $candidates as $candidate ) {
			if ( '' !== $candidate && self::exists( $candidate ) ) {
				$key = $candidate;
				break;
			}
		}
		$filtered = apply_filters(
			'rooster_lms_ui_look',
			$key,
			array(
				'org'  => $org,
				'unit' => $unit,
				'user' => $user_id,
			)
		);
		return is_string( $filtered ) && self::exists( $filtered ) ? $filtered : $key;
	}

	public static function current(): string {
		$applied = Tokens::applied_look();
		return '' !== $applied && self::exists( $applied ) ? $applied : self::site();
	}

	public static function site(): string {
		$key = (string) Settings::get( 'ui_look' );
		return self::exists( $key ) ? $key : self::DEFAULT;
	}

	public static function forget(): void {
		self::$all = array();
	}

	private static function clean( array $look ): ?array {
		$label = is_string( $look['label'] ?? null ) ? sanitize_text_field( $look['label'] ) : '';
		if ( '' === $label ) {
			return null;
		}
		$tokens = array();
		foreach ( is_array( $look['tokens'] ?? null ) ? $look['tokens'] : array() as $name => $value ) {
			$value = is_scalar( $value ) ? trim( (string) $value ) : '';
			if ( is_string( $name ) && 1 === preg_match( '/^--rl-[a-z0-9-]+$/', $name ) && '' !== $value && 1 !== preg_match( '/[;{}<>\\\\]|\/\*/', $value ) ) {
				$tokens[ $name ] = $value;
			}
		}
		$swatches = array();
		foreach ( is_array( $look['swatches'] ?? null ) ? $look['swatches'] : array() as $colour ) {
			$hex = is_string( $colour ) ? (string) sanitize_hex_color( $colour ) : '';
			if ( '' !== $hex ) {
				$swatches[] = $hex;
			}
		}
		$layout = is_string( $look['layout'] ?? null ) ? sanitize_key( $look['layout'] ) : '';
		return array(
			'label'       => $label,
			'description' => is_string( $look['description'] ?? null ) ? sanitize_text_field( $look['description'] ) : '',
			'tokens'      => $tokens,
			'dark'        => ! empty( $look['dark'] ),
			'style'       => is_string( $look['style'] ?? null ) ? sanitize_key( $look['style'] ) : '',
			'swatches'    => array_slice( $swatches, 0, 3 ),
			'layout'      => '' !== $layout ? $layout : 'default',
		);
	}
}