<?php

declare(strict_types=1);

namespace FlexatechTableReservations\Setup;

use DateTimeImmutable;
use DateTimeZone;

defined( 'ABSPATH' ) || exit;

/**
 * What the sample pages say. Core blocks only, so any theme shows them, and
 * text in [brackets] is for the owner to replace. The pages link to each
 * other, so each is built once the pages it links to have their address.
 */
final class StarterPages {

	/** The order the pages are made in: a page comes after the ones it links to. */
	public const KEYS = [ 'policy', 'booking', 'menu', 'about', 'contact' ];

	public static function title( string $key ): string {
		return match ( $key ) {
			'policy'  => __( 'Cancellation policy', 'flexatech-table-reservations' ),
			'booking' => __( 'Book a table', 'flexatech-table-reservations' ),
			'menu'    => __( 'Menu', 'flexatech-table-reservations' ),
			'about'   => __( 'About us', 'flexatech-table-reservations' ),
			'contact' => __( 'Contact', 'flexatech-table-reservations' ),
			default   => '',
		};
	}

	/**
	 * @param array<string,string>                                                        $links     Page key to the address of a page made already.
	 * @param list<array{name:string,days:list<int>,opens:string,last_seating:string}>    $shifts    The active shifts, for the opening hours.
	 * @param int                                                                         $party_max Largest party that books online.
	 */
	public static function content( string $key, array $links, array $shifts, int $party_max ): string {
		return match ( $key ) {
			'policy'  => self::policy(),
			'booking' => self::booking( $links, $party_max ),
			'menu'    => self::menu( $links ),
			'about'   => self::about( $links ),
			'contact' => self::contact( $links, $shifts ),
			default   => '',
		};
	}

	/**
	 * @param array<string,string> $links
	 */
	private static function booking( array $links, int $party_max ): string {
		$out = self::p( esc_html__( 'Pick a day and how many of you are coming, then choose a time. We email you as soon as your table is booked.', 'flexatech-table-reservations' ) )
			. "<!-- wp:fxtr/reservation-form /-->\n\n"
			. self::p(
				esc_html(
					sprintf(
						/* translators: %d: largest party that books online */
						__( 'For a party of more than %d, or for a private event, call us on [phone number].', 'flexatech-table-reservations' ),
						$party_max
					)
				)
			);

		if ( isset( $links['policy'] ) ) {
			$out .= self::p(
				sprintf(
					/* translators: %s: link to the cancellation policy page */
					esc_html__( 'Plans change. Read our %s before you book.', 'flexatech-table-reservations' ),
					self::a( $links['policy'], __( 'cancellation policy', 'flexatech-table-reservations' ) )
				)
			);
		}

		return $out;
	}

	/**
	 * @param array<string,string> $links
	 */
	private static function menu( array $links ): string {
		$sections = [
			__( 'Starters', 'flexatech-table-reservations' ) => [
				[ __( 'Seasonal soup', 'flexatech-table-reservations' ), '[6.50]', __( 'Made fresh each morning, served with warm bread.', 'flexatech-table-reservations' ) ],
				[ __( 'Garden salad', 'flexatech-table-reservations' ), '[7.00]', __( 'Leaves, herbs, toasted seeds and a lemon dressing.', 'flexatech-table-reservations' ) ],
			],
			__( 'Mains', 'flexatech-table-reservations' ) => [
				[ __( 'Grilled fish of the day', 'flexatech-table-reservations' ), '[18.00]', __( 'With new potatoes and green beans.', 'flexatech-table-reservations' ) ],
				[ __( 'Slow-cooked beef', 'flexatech-table-reservations' ), '[21.00]', __( 'Braised for six hours, with mash and greens.', 'flexatech-table-reservations' ) ],
				[ __( 'Mushroom risotto', 'flexatech-table-reservations' ), '[15.00]', __( 'Vegetarian. Ask us for a vegan version.', 'flexatech-table-reservations' ) ],
			],
			__( 'Desserts', 'flexatech-table-reservations' ) => [
				[ __( 'Chocolate tart', 'flexatech-table-reservations' ), '[7.50]', __( 'With vanilla ice cream.', 'flexatech-table-reservations' ) ],
				[ __( 'Fruit plate', 'flexatech-table-reservations' ), '[6.00]', __( 'Whatever is ripe this week.', 'flexatech-table-reservations' ) ],
			],
		];

		$out = self::p( esc_html__( '[A line about your food: where it comes from, how often the menu changes.] These dishes and prices are samples. Replace them with your own.', 'flexatech-table-reservations' ) );
		foreach ( $sections as $section => $dishes ) {
			$out .= self::h( esc_html( $section ) );
			foreach ( $dishes as [ $name, $price, $about ] ) {
				$out .= self::p( '<strong>' . esc_html( $name ) . '</strong> ' . esc_html( $price ) . '<br>' . esc_html( $about ) );
			}
		}
		$out .= self::p( esc_html__( 'Tell us about any allergy when you book. There is a box for it on the form.', 'flexatech-table-reservations' ) );

		return $out . self::book_line( $links );
	}

	/**
	 * @param array<string,string> $links
	 */
	private static function about( array $links ): string {
		return self::p( esc_html__( '[Who you are and how the restaurant started. Two or three sentences are enough.]', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'Our kitchen', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( '[What you cook, who cooks it and where the produce comes from.]', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'The room', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( '[Inside, the terrace, the bar: what it is like to sit there, and whether children and dogs are welcome.]', 'flexatech-table-reservations' ) )
			. self::book_line( $links );
	}

	/**
	 * @param array<string,string>                                                     $links
	 * @param list<array{name:string,days:list<int>,opens:string,last_seating:string}> $shifts
	 */
	private static function contact( array $links, array $shifts ): string {
		$out = self::h( esc_html__( 'Find us', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( '[Street and number]', 'flexatech-table-reservations' ) . '<br>' . esc_html__( '[Postcode and city]', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( 'Phone: [phone number]', 'flexatech-table-reservations' ) . '<br>' . esc_html__( 'Email: [email address]', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'Opening hours', 'flexatech-table-reservations' ) );

		$hours = array_map( [ self::class, 'hours_line' ], $shifts );
		$out  .= self::p(
			[] === $hours
				? esc_html__( '[Your opening hours. Add your shifts in Flexatech Table Reservations and the booking form shows the same times.]', 'flexatech-table-reservations' )
				: implode( '<br>', array_map( 'esc_html', $hours ) )
		);

		return $out . self::book_line( $links );
	}

	private static function policy(): string {
		return self::p( esc_html__( 'We keep your table for you, so please tell us if you cannot come. [Edit this page to match how your restaurant works.]', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'Changing or cancelling', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( 'Your confirmation email has a link where you can move your table to another time or cancel it. You can also call us.', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'Arriving late', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( 'We hold your table for [15] minutes. After that it may go to guests who are waiting.', 'flexatech-table-reservations' ) )
			. self::h( esc_html__( 'Deposits and no-shows', 'flexatech-table-reservations' ) )
			. self::p( esc_html__( '[If you take a deposit or keep a card on file: how much, for which parties or dates, until when it is refunded on a cancellation, and the fee for not coming. Delete this part if you do not.]', 'flexatech-table-reservations' ) );
	}

	/**
	 * "Dinner: Monday to Saturday, tables from 5:30 pm to 9:30 pm".
	 *
	 * @param array{name:string,days:list<int>,opens:string,last_seating:string} $shift
	 */
	public static function hours_line( array $shift ): string {
		return sprintf(
			/* translators: 1: shift name, 2: days, such as "Monday to Friday", 3: first time, 4: last time a party sits down */
			__( '%1$s: %2$s, tables from %3$s to %4$s', 'flexatech-table-reservations' ),
			$shift['name'],
			self::days( $shift['days'] ),
			self::time( $shift['opens'] ),
			self::time( $shift['last_seating'] )
		);
	}

	/**
	 * Weekdays (0 Sunday to 6 Saturday) in a week that starts on Monday, with
	 * runs of three or more days written as a range.
	 *
	 * @param list<int> $days
	 */
	public static function days( array $days ): string {
		if ( 7 === count( array_unique( $days ) ) ) {
			return __( 'every day', 'flexatech-table-reservations' );
		}

		$runs = [];
		foreach ( [ 1, 2, 3, 4, 5, 6, 0 ] as $day ) {
			if ( ! in_array( $day, $days, true ) ) {
				continue;
			}
			$last = array_key_last( $runs );
			if ( null !== $last && end( $runs[ $last ] ) === self::before( $day ) ) {
				$runs[ $last ][] = $day;
			} else {
				$runs[] = [ $day ];
			}
		}

		$parts = [];
		foreach ( $runs as $run ) {
			if ( count( $run ) >= 3 ) {
				/* translators: 1: first weekday, 2: last weekday */
				$parts[] = sprintf( __( '%1$s to %2$s', 'flexatech-table-reservations' ), self::weekday( $run[0] ), self::weekday( (int) end( $run ) ) );
			} else {
				foreach ( $run as $day ) {
					$parts[] = self::weekday( $day );
				}
			}
		}

		return implode( ', ', $parts );
	}

	/** The weekday before this one in a week from Monday to Sunday; Monday has none. */
	private static function before( int $day ): int {
		return match ( $day ) {
			1       => -1,
			0       => 6,
			default => $day - 1,
		};
	}

	private static function weekday( int $day ): string {
		global $wp_locale;

		return isset( $wp_locale ) ? (string) $wp_locale->get_weekday( $day ) : gmdate( 'l', gmmktime( 0, 0, 0, 1, 4 + $day, 1970 ) );
	}

	/** "HH:MM" in the site's time format. */
	private static function time( string $time ): string {
		$at = DateTimeImmutable::createFromFormat( '!H:i', substr( $time, 0, 5 ), new DateTimeZone( 'UTC' ) );
		if ( false === $at ) {
			return $time;
		}

		return (string) wp_date( (string) get_option( 'time_format', 'g:i a' ), $at->getTimestamp(), new DateTimeZone( 'UTC' ) );
	}

	/**
	 * @param array<string,string> $links
	 */
	private static function book_line( array $links ): string {
		if ( ! isset( $links['booking'] ) ) {
			return '';
		}

		return self::p( self::a( $links['booking'], __( 'Book a table', 'flexatech-table-reservations' ) ) );
	}

	/** A paragraph block around HTML that is already escaped. */
	private static function p( string $html ): string {
		return "<!-- wp:paragraph -->\n<p>{$html}</p>\n<!-- /wp:paragraph -->\n\n";
	}

	/** A level 2 heading block around text that is already escaped. */
	private static function h( string $html ): string {
		return "<!-- wp:heading -->\n<h2 class=\"wp-block-heading\">{$html}</h2>\n<!-- /wp:heading -->\n\n";
	}

	private static function a( string $url, string $text ): string {
		return '<a href="' . esc_url( $url ) . '">' . esc_html( $text ) . '</a>';
	}
}