<?php
declare(strict_types=1);

namespace WebCalendar\WP\Bridge;

defined( 'ABSPATH' ) || exit;

use WebCalendar\Core\Domain\Entity\User;
use WebCalendar\Core\Domain\Repository\UserRepositoryInterface;
use WebCalendar\Core\Domain\ValueObject\UserPreference;
use WP_User;

/**
 * WordPress implementation of the UserRepositoryInterface.
 */
class WpUserRepository implements UserRepositoryInterface {

	/**
	 * Finds a user by their unique login.
	 *
	 * @param string $login Unique login identifier.
	 * @return User|null
	 */
	public function findByLogin( string $login ): ?User {
		$wp_user = get_user_by( 'login', $login );
		if ( ! $wp_user ) {
			return null;
		}

		return $this->map_wp_user_to_entity( $wp_user );
	}

	/**
	 * Returns all users in the system.
	 *
	 * @return User[]
	 */
	public function findAll(): array {
		$wp_users = get_users();
		return array_map( [ $this, 'map_wp_user_to_entity' ], $wp_users );
	}

	/**
	 * Returns only enabled users.
	 *
	 * In WordPress, all existing users are considered enabled,
	 * so this delegates to findAll().
	 *
	 * @return User[]
	 */
	#[\Override]
	public function findAllEnabled(): array {
		return $this->findAll();
	}

	/**
	 * Persists a user.
	 *
	 * @param User $user User entity.
	 */
	public function save( User $user ): void {
		// In MVP, we might not want to create WP users from here.
		// But we could if needed using wp_insert_user.
	}

	/**
	 * Deletes a user by their login.
	 *
	 * The successor becomes WordPress's reassign target, so UserLifecycle
	 * moves the deleted user's calendar rows to them. Without one (or when
	 * it names no user, or the deleted user), the rows go to the tombstone
	 * login as before.
	 *
	 * @param string      $login     User login.
	 * @param string|null $successor Login to take over the user's calendar data.
	 */
	#[\Override]
	public function delete( string $login, ?string $successor = null ): void {
		$wp_user = get_user_by( 'login', $login );
		if ( ! $wp_user ) {
			return;
		}

		$reassign = null;
		if ( null !== $successor && $successor !== $login ) {
			$heir = get_user_by( 'login', $successor );
			if ( $heir ) {
				$reassign = $heir->ID;
			}
		}

		wp_delete_user( $wp_user->ID, $reassign );
	}

	/**
	 * Returns all preferences for a user.
	 *
	 * @param string $login User login.
	 * @return UserPreference[]
	 */
	public function getPreferences( string $login ): array {
		$wp_user = get_user_by( 'login', $login );
		if ( ! $wp_user ) {
			return [];
		}

		$prefs = get_user_meta( $wp_user->ID, 'webcal_prefs', true );
		if ( ! is_array( $prefs ) ) {
			return [];
		}

		$results = [];
		foreach ( $prefs as $key => $value ) {
			$results[] = new UserPreference( $key, is_scalar( $value ) ? (string) $value : '' );
		}

		return $results;
	}

	/**
	 * Saves a preference for a user.
	 *
	 * @param string $login User login.
	 * @param UserPreference $preference User preference.
	 */
	public function savePreference( string $login, UserPreference $preference ): void {
		$wp_user = get_user_by( 'login', $login );
		if ( ! $wp_user ) {
			return;
		}

		$prefs = get_user_meta( $wp_user->ID, 'webcal_prefs', true );
		if ( ! is_array( $prefs ) ) {
			$prefs = [];
		}

		$prefs[ $preference->key() ] = $preference->value();
		update_user_meta( $wp_user->ID, 'webcal_prefs', $prefs );
	}

	/**
	 * Gets the password hash for a user.
	 *
	 * @param string $login User login.
	 * @return string|null
	 */
	public function getPasswordHash( string $login ): ?string {
		$wp_user = get_user_by( 'login', $login );
		if ( ! $wp_user ) {
			return null;
		}
		/** @phpstan-ignore-next-line */
		return is_scalar( $wp_user->user_pass ) ? (string) $wp_user->user_pass : null;
	}

	/**
	 * Sets the password hash for a user.
	 *
	 * @param string $login User login.
	 * @param string $hash Password hash.
	 */
	public function setPassword( string $login, string $hash ): void {
		$wp_user = get_user_by( 'login', $login );
		if ( $wp_user ) {
			wp_set_password( $hash, $wp_user->ID );
		}
	}

	/**
	 * Maps a WP_User object to a WebCalendar User entity.
	 *
	 * @param WP_User $wp_user WordPress user object.
	 * @return User
	 */
	private function map_wp_user_to_entity( WP_User $wp_user ): User {
		return new User(
			$wp_user->user_login,
			$wp_user->first_name ?: $wp_user->display_name,
			$wp_user->last_name ?: '',
			$wp_user->user_email,
			user_can( $wp_user, 'manage_options' ),
			true // WP users are generally enabled if they exist
		);
	}
}