<?php
namespace Strikewise\Admin;

use Strikewise\Calculator\ReferenceCalculator;
use Strikewise\Licensing\Licensing;
use Strikewise\Pricing\Perishable;

defined( 'ABSPATH' ) || exit;

/**
 * Settings section under WooCommerce -> Settings -> Products -> Strikewise.
 */
final class Settings {

	const SECTION = 'strikewise';

	public function register(): void {
		add_filter( 'woocommerce_get_sections_products', array( $this, 'add_section' ) );
		add_filter( 'woocommerce_get_settings_products', array( $this, 'get_settings' ), 10, 2 );
		add_action( 'woocommerce_admin_field_strikewise_intro', array( $this, 'render_intro' ) );
		add_filter( 'plugin_action_links_' . plugin_basename( STRIKEWISE_FILE ), array( $this, 'action_links' ) );
	}

	/**
	 * @param array<string,string> $sections
	 * @return array<string,string>
	 */
	public function add_section( $sections ) {
		$sections[ self::SECTION ] = __( 'Strikewise', 'strikewise' );
		return $sections;
	}

	/**
	 * @param array<int,array<string,mixed>> $settings
	 * @param string                         $current_section
	 * @return array<int,array<string,mixed>>
	 */
	public function get_settings( $settings, $current_section ) {
		if ( self::SECTION !== $current_section ) {
			return $settings;
		}

		$fields = array(
			array(
				'type' => 'strikewise_intro',
				'id'   => 'strikewise_intro',
			),
			array(
				'title' => __( 'Display in the shop', 'strikewise' ),
				'type'  => 'title',
				'desc'  => __( 'Shows the lowest price of the 30 days before a price reduction, as required by Art. 6a of Directive 98/6/EC (in Germany § 11 PAngV). This is not legal advice.', 'strikewise' ),
				'id'    => 'strikewise_display',
			),
			array(
				'title'   => __( 'When to show', 'strikewise' ),
				'id'      => 'strikewise_mode',
				'type'    => 'select',
				'default' => ReferenceCalculator::MODE_REDUCTION,
				'options' => array(
					ReferenceCalculator::MODE_REDUCTION => __( 'Only for reduced products (legal requirement)', 'strikewise' ),
					ReferenceCalculator::MODE_ALWAYS    => __( 'Always: lowest price of the last 30 days', 'strikewise' ),
				),
			),
			array(
				'title'         => __( 'Show on', 'strikewise' ),
				'desc'          => __( 'Single product page', 'strikewise' ),
				'id'            => 'strikewise_show_single',
				'type'          => 'checkbox',
				'default'       => 'yes',
				'checkboxgroup' => 'start',
			),
			array(
				'desc'          => __( 'Shop, category and other product lists', 'strikewise' ),
				'id'            => 'strikewise_show_loop',
				'type'          => 'checkbox',
				'default'       => 'yes',
				'checkboxgroup' => 'end',
			),
			array(
				'title'       => __( 'Text', 'strikewise' ),
				'desc'        => __( '{price} is replaced with the lowest price.', 'strikewise' ),
				'id'          => 'strikewise_text',
				'type'        => 'text',
				'default'     => '',
				'placeholder' => self::default_text(),
				'css'         => 'min-width: 400px;',
			),
			array(
				'title'   => __( 'Notice without price history', 'strikewise' ),
				'desc'    => __( 'What to show for a reduced product when no price from before the reduction is known, e.g. directly after installing Strikewise.', 'strikewise' ),
				'id'      => 'strikewise_fallback',
				'type'    => 'select',
				'default' => 'hide',
				'options' => array(
					'hide' => __( 'Show nothing', 'strikewise' ),
					'text' => __( 'Show a custom text', 'strikewise' ),
				),
			),
			array(
				'title'       => __( 'Custom text', 'strikewise' ),
				'id'          => 'strikewise_fallback_text',
				'type'        => 'text',
				'default'     => '',
				'placeholder' => self::default_fallback_text(),
				'css'         => 'min-width: 400px;',
			),
			Perishable::setting(),
			array(
				'type' => 'sectionend',
				'id'   => 'strikewise_display',
			),
		);

		/**
		 * Filters the Strikewise settings. Premium features add complete groups
		 * (a "title" row, their fields and a "sectionend" row).
		 *
		 * @param array<int,array<string,mixed>> $fields
		 */
		$fields = (array) apply_filters( 'strikewise_settings', $fields );

		if ( Licensing::show_upsell() ) {
			$fields[] = array(
				'title' => __( 'Premium', 'strikewise' ),
				'type'  => 'title',
				'desc'  => esc_html__( 'The compliance scanner checks your shop every week, the sale planner checks discounts before they start, and the UVP mode labels manufacturer price comparisons.', 'strikewise' )
					. ' <a href="' . esc_url( Licensing::upgrade_url() ) . '">' . esc_html__( 'See plans', 'strikewise' ) . '</a>',
				'id'    => 'strikewise_premium_teaser',
			);
			$fields[] = array(
				'type' => 'sectionend',
				'id'   => 'strikewise_premium_teaser',
			);
		}

		$fields[] = array(
			'title' => __( 'Data', 'strikewise' ),
			'type'  => 'title',
			'id'    => 'strikewise_data',
		);
		$fields[] = array(
			'title'   => __( 'Delete data on uninstall', 'strikewise' ),
			'desc'    => __( 'Remove the price history and all settings when the plugin is deleted. Leave this off if you may need the history as evidence.', 'strikewise' ),
			'id'      => 'strikewise_delete_data',
			'type'    => 'checkbox',
			'default' => 'no',
		);
		$fields[] = array(
			'type' => 'sectionend',
			'id'   => 'strikewise_data',
		);

		return $fields;
	}

	public function render_intro(): void {
		echo '<div class="sw-settings-intro"><img src="' . esc_url( Assets::icon_url() ) . '" alt="">';
		echo '<p><strong>Strikewise</strong><br>' . esc_html__( 'Key figures, compliance report and import are on the overview page.', 'strikewise' );
		echo ' <a href="' . esc_url( admin_url( 'admin.php?page=' . AdminPage::SLUG ) ) . '">' . esc_html__( 'Open overview', 'strikewise' ) . ' →</a></p></div>';
	}

	/**
	 * @param string[] $links
	 * @return string[]
	 */
	public function action_links( $links ) {
		$url = admin_url( 'admin.php?page=wc-settings&tab=products&section=' . self::SECTION );
		array_unshift( $links, '<a href="' . esc_url( $url ) . '">' . esc_html__( 'Settings', 'strikewise' ) . '</a>' );
		return $links;
	}

	public static function mode(): string {
		$mode = get_option( 'strikewise_mode', ReferenceCalculator::MODE_REDUCTION );
		return ReferenceCalculator::MODE_ALWAYS === $mode ? ReferenceCalculator::MODE_ALWAYS : ReferenceCalculator::MODE_REDUCTION;
	}

	/**
	 * The legal minimum is 30 days. Filterable for markets with longer periods.
	 */
	public static function window_days(): int {
		return max( 30, (int) apply_filters( 'strikewise_window_days', 30 ) );
	}

	/**
	 * How long closed history rows are kept. Rows a running reduction needs are always kept.
	 */
	public static function retention_days(): int {
		// Evidence for disputes: keep more than a year (claims under § 11 UWG become time-barred after 6 months from knowledge).
		return max( self::window_days() + 1, (int) apply_filters( 'strikewise_retention_days', 400 ) );
	}

	public static function show_single(): bool {
		return 'yes' === get_option( 'strikewise_show_single', 'yes' );
	}

	public static function show_loop(): bool {
		return 'yes' === get_option( 'strikewise_show_loop', 'yes' );
	}

	public static function text(): string {
		$text = trim( (string) get_option( 'strikewise_text', '' ) );
		return '' === $text ? self::default_text() : $text;
	}

	public static function fallback(): string {
		return 'text' === get_option( 'strikewise_fallback', 'hide' ) ? 'text' : 'hide';
	}

	public static function fallback_text(): string {
		$text = trim( (string) get_option( 'strikewise_fallback_text', '' ) );
		return '' === $text ? self::default_fallback_text() : $text;
	}

	public static function default_text(): string {
		if ( ReferenceCalculator::MODE_ALWAYS === self::mode() ) {
			/* translators: {price} is a placeholder, keep it as is. */
			return __( 'Lowest price in the last 30 days: {price}', 'strikewise' );
		}
		// During a reduction "the last 30 days" would include the sale itself.
		/* translators: {price} is a placeholder, keep it as is. */
		return __( 'Lowest price of the 30 days before the reduction: {price}', 'strikewise' );
	}

	public static function default_fallback_text(): string {
		return __( 'No earlier price available for the last 30 days.', 'strikewise' );
	}
}