<?php

declare(strict_types=1);

namespace Agent001\Admin;

\defined( 'ABSPATH' ) || exit;

use Agent001\Config\Settings;

final class Onboarding
{
    public const OPTION = 'agent001_onboarding';
    public const REDIRECT_TRANSIENT = 'agent001_onboarding_redirect';
    public const ACTION = 'agent001_onboarding';

    private Settings $settings;
    private SyncProgress $progress;

    public function __construct( Settings $settings, ?SyncProgress $progress = null )
    {
        $this->settings = $settings;
        $this->progress = $progress ?? new SyncProgress();
    }

    public function register(): void
    {
        \add_action( 'admin_init', [ $this, 'redirectAfterActivation' ] );
        \add_action( 'admin_post_' . self::ACTION, [ $this, 'handleAction' ] );
    }

    public function isActive(): bool
    {
        return \get_option( self::OPTION, '' ) === 'active';
    }

    public function isPaused(): bool
    {
        return \get_option( self::OPTION, '' ) === 'paused';
    }

    public function step(): int
    {
        if ( ! $this->settings->hasApiKey() ) {
            return 1;
        }

        return $this->settings->hasSelectedAgents() && $this->settings->selectedAgentEmbedToken() !== '' ? 3 : 2;
    }

    public function canFinish(): bool
    {
        $progress = $this->progress->current();

        return $this->step() === 3 && ! $progress['running'] && $progress['phase'] === SyncProgress::PHASE_DONE;
    }

    public function settingsUrl(): string
    {
        return \add_query_arg(
            [ 'page' => SettingsPage::PAGE_SLUG ],
            \admin_url( 'admin.php' )
        );
    }

    public function redirectAfterActivation(): void
    {
        $userId = \get_transient( self::REDIRECT_TRANSIENT );
        if ( ! $userId || (int) $userId !== \get_current_user_id() ) {
            return;
        }
        if ( ! \current_user_can( SettingsPage::CAPABILITY )
            || \wp_doing_ajax()
            || \wp_doing_cron()
            || \is_network_admin()
            || ( \defined( 'WP_CLI' ) && \WP_CLI )
            || ( $GLOBALS['pagenow'] ?? '' ) === 'admin-post.php'
        ) {
            return;
        }

        \delete_transient( self::REDIRECT_TRANSIENT );
        if ( ! $this->isActive() ) {
            return;
        }

        \wp_safe_redirect( $this->settingsUrl() );
        exit;
    }

    public function handleAction(): void
    {
        if ( ! \current_user_can( SettingsPage::CAPABILITY ) ) {
            \wp_die( \esc_html__( 'Permission denied.', 'agent001-support-assistant-for-woocommerce' ), '', [ 'response' => 403 ] );
        }

        \check_admin_referer( self::ACTION, '_agent001_onboarding_nonce' );

        $operation = isset( $_POST['operation'] ) && is_string( $_POST['operation'] )
            ? \sanitize_key( \wp_unslash( $_POST['operation'] ) )
            : '';
        if ( ! \in_array( $operation, [ 'pause', 'resume', 'finish' ], true ) ) {
            \wp_die( \esc_html__( 'Invalid setup action.', 'agent001-support-assistant-for-woocommerce' ), '', [ 'response' => 400 ] );
        }

        if ( $operation === 'finish' && ! $this->canFinish() ) {
            \wp_die( \esc_html__( 'Complete the first synchronization before finishing setup.', 'agent001-support-assistant-for-woocommerce' ), '', [ 'response' => 409 ] );
        }

        \update_option( self::OPTION, $operation === 'pause' ? 'paused' : ( $operation === 'finish' ? 'complete' : 'active' ), false );

        \wp_safe_redirect( $this->settingsUrl() );
        exit;
    }
}