<?php

/**
 * A1-WooCOG - Admin Menu & Pages
 *
 * @package A1_WooCOG
 * @since   1.0.0
 */
if ( !defined( 'ABSPATH' ) ) {
    exit;
}
class A1WooCOG_Admin {
    private static $instance = null;

    /** @var string Hook suffix of the reports page, set by register_menu(). */
    private $report_page_hook = '';

    public static function get_instance() {
        if ( null === self::$instance ) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    private function __construct() {
        add_action( 'admin_menu', array($this, 'register_menu') );
    }

    public function register_menu() {
        $hook = add_submenu_page(
            'woocommerce',
            __( 'Cost of Goods Report', 'a1-profit-reports-for-woocommerce' ),
            __( 'Cost of Goods', 'a1-profit-reports-for-woocommerce' ),
            'manage_woocommerce',
            'a1woocog-reports',
            array($this, 'render_reports_page')
        );
        $this->report_page_hook = $hook;
        $this->maybe_register_freemius_activation_placeholder();
        // Fires early enough to send file-download headers or redirect, before any admin page HTML is output.
        add_action( "load-{$hook}", array($this, 'maybe_export_csv') );
        add_action( "load-{$hook}", array($this, 'maybe_recalculate_cogs') );
        add_action( "load-{$hook}", array($this, 'maybe_save_settings') );
        add_action( 'admin_enqueue_scripts', array($this, 'enqueue_report_scripts') );
    }

    /**
     * Freemius's Account page is configured (see a1-woocog.php's
     * fs_dynamic_init 'menu' config) to nest under WooCommerce's top-level
     * menu at its own raw slug, 'a1woocog-account'. Freemius's SDK treats
     * that raw slug as this plugin's permanent "default page": it's what
     * override_submenu_action() looks for during the pre-connection
     * activation flow (the "Opt In" banner/link on the Plugins page), AND
     * it's what get_after_activation_url() (via _get_admin_page_url( '' ))
     * redirects back to immediately after "Allow & Continue" or "Skip"
     * complete. Unlike its top-level-menu code path (see A1-WooBay, which
     * owns its own top-level page at the exact slug Freemius uses there),
     * the submenu code path has no fallback to create this page from
     * scratch if it doesn't already exist - so with nothing in this plugin
     * ever registering that slug, every one of those transitions landed on
     * a page WordPress had never heard of, producing its generic "Sorry,
     * you are not allowed to access this page" error. Confirmed live on
     * wp.org for both the very first "Opt In" click (1.2.9) and again
     * immediately after "Allow & Continue" finishes connecting (this fix).
     *
     * Fix: register this page unconditionally (default priority, so it
     * exists before Freemius's own admin_menu hook, which runs at
     * WP_FS__LOWEST_PRIORITY) so the raw slug always resolves to something,
     * in every connection state. Only shown as a visible WooCommerce
     * submenu item while Freemius's own real Account page - a different,
     * suffixed slug, 'a1woocog-account-account', built via its own
     * get_slug( 'account' ) - doesn't exist yet (i.e. while !is_registered()).
     * Once connected, this re-registers with an empty parent slug instead:
     * WordPress still fully registers and dispatches it (the same "hidden
     * but functional" pattern Freemius's own SDK uses for its activation
     * override - see override_plugin_menu_with_activation() passing '' as
     * the parent for its own fallback page), it just isn't shown in any
     * menu, so there's no second, duplicate "A1 Profit" item alongside the
     * real one.
     */
    private function maybe_register_freemius_activation_placeholder() {
        $is_registered = a1woocog_fs()->is_registered();
        add_submenu_page(
            ( $is_registered ? '' : 'woocommerce' ),
            __( 'A1 Profit', 'a1-profit-reports-for-woocommerce' ),
            __( 'A1 Profit', 'a1-profit-reports-for-woocommerce' ),
            'manage_woocommerce',
            'a1woocog-account',
            array($this, 'render_account_placeholder')
        );
    }

    /**
     * Only reachable when Freemius doesn't hijack this page itself - either
     * pre-connection if its activation-mode override didn't fire for some
     * reason, or post-connection where it's just a safety-net redirect to
     * the real Account page (see maybe_register_freemius_activation_placeholder()).
     */
    public function render_account_placeholder() {
        if ( !current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Permission denied.', 'a1-profit-reports-for-woocommerce' ) );
        }
        $target = ( a1woocog_fs()->is_registered() ? a1woocog_fs()->get_account_url() : admin_url( 'admin.php?page=a1woocog-reports' ) );
        wp_safe_redirect( $target );
        exit;
    }

    /**
     * The date-preset <select> on the (Pro-only) report page needs a bit of
     * JS to compute From/To and auto-submit — registered/enqueued here
     * instead of a hardcoded <script> tag in the view.
     */
    public function enqueue_report_scripts( $hook_suffix ) {
        if ( $hook_suffix !== $this->report_page_hook ) {
            return;
        }
        if ( !a1woocog_fs()->is__premium_only() || !A1WooCOG_License::allow_reports() ) {
            return;
        }
        wp_register_script(
            'a1woocog-reports',
            false,
            array(),
            A1WOOCOG_VERSION,
            true
        );
        wp_enqueue_script( 'a1woocog-reports' );
        wp_add_inline_script( 'a1woocog-reports', "function a1woocogSetDatePreset( preset ) {\r\n\t\t\tif ( ! preset ) {\r\n\t\t\t\treturn;\r\n\t\t\t}\r\n\r\n\t\t\tfunction pad( n ) { return n < 10 ? '0' + n : String( n ); }\r\n\t\t\tfunction fmt( d ) { return d.getFullYear() + '-' + pad( d.getMonth() + 1 ) + '-' + pad( d.getDate() ); }\r\n\r\n\t\t\tvar today = new Date();\r\n\t\t\tvar y     = today.getFullYear();\r\n\t\t\tvar m     = today.getMonth(); // 0-indexed\r\n\t\t\tvar from, to;\r\n\r\n\t\t\tswitch ( preset ) {\r\n\t\t\t\tcase 'last30':\r\n\t\t\t\t\tto   = new Date( today );\r\n\t\t\t\t\tfrom = new Date( today );\r\n\t\t\t\t\tfrom.setDate( from.getDate() - 29 );\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase 'this_month':\r\n\t\t\t\t\tfrom = new Date( y, m, 1 );\r\n\t\t\t\t\tto   = new Date( today );\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase 'this_quarter':\r\n\t\t\t\t\tvar qStart = Math.floor( m / 3 ) * 3;\r\n\t\t\t\t\tfrom = new Date( y, qStart, 1 );\r\n\t\t\t\t\tto   = new Date( today );\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase 'last_quarter':\r\n\t\t\t\t\tvar lastQStart = Math.floor( m / 3 ) * 3 - 3;\r\n\t\t\t\t\tvar lastQYear  = y;\r\n\t\t\t\t\tif ( lastQStart < 0 ) {\r\n\t\t\t\t\t\tlastQStart += 12;\r\n\t\t\t\t\t\tlastQYear  -= 1;\r\n\t\t\t\t\t}\r\n\t\t\t\t\tfrom = new Date( lastQYear, lastQStart, 1 );\r\n\t\t\t\t\tto   = new Date( lastQYear, lastQStart + 3, 0 ); // last day of that quarter\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase 'this_year':\r\n\t\t\t\t\tfrom = new Date( y, 0, 1 );\r\n\t\t\t\t\tto   = new Date( today );\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tcase 'last_year':\r\n\t\t\t\t\tfrom = new Date( y - 1, 0, 1 );\r\n\t\t\t\t\tto   = new Date( y - 1, 11, 31 );\r\n\t\t\t\t\tbreak;\r\n\t\t\t\tdefault:\r\n\t\t\t\t\treturn;\r\n\t\t\t}\r\n\r\n\t\t\tdocument.getElementById( 'date_from' ).value = fmt( from );\r\n\t\t\tdocument.getElementById( 'date_to' ).value   = fmt( to );\r\n\t\t\tdocument.getElementById( 'a1woocog_preset' ).form.submit();\r\n\t\t}" );
    }

    public function render_reports_page() {
        if ( !current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Permission denied.', 'a1-profit-reports-for-woocommerce' ) );
        }
        // Stripped entirely from the free/wp.org build by Freemius's
        // code-stripping build step (the is__premium_only() naming
        // convention) — reports-page__premium_only.php doesn't exist in
        // that build either, so the free build always falls through to the
        // upsell screen below, regardless of license state.
        if ( a1woocog_fs()->is__premium_only() && A1WooCOG_License::allow_reports() ) {
            include A1WOOCOG_PLUGIN_DIR . 'admin/views/reports-page__premium_only.php';
            return;
        }
        include A1WOOCOG_PLUGIN_DIR . 'admin/views/reports-page-upsell.php';
    }

    /**
     * Stream the report as a CSV download when the "Export CSV" button was used.
     */
    public function maybe_export_csv() {
        if ( !isset( $_GET['a1woocog_export'] ) || 'csv' !== $_GET['a1woocog_export'] ) {
            return;
        }
        if ( !current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Permission denied.', 'a1-profit-reports-for-woocommerce' ) );
        }
        wp_die( esc_html( A1WooCOG_License::reports_upsell_message() ) );
    }

    /**
     * Force-recalculate Cost of Goods for every order in the submitted date
     * range, using each product's current cost — for orders that predate the
     * feature (or this plugin) and would otherwise silently show $0 cost.
     */
    public function maybe_recalculate_cogs() {
        if ( empty( $_POST['a1woocog_recalculate'] ) ) {
            return;
        }
        if ( !current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Permission denied.', 'a1-profit-reports-for-woocommerce' ) );
        }
        wp_die( esc_html( A1WooCOG_License::reports_upsell_message() ) );
    }

    /**
     * Save which order statuses count as a sale for reporting purposes.
     */
    public function maybe_save_settings() {
        if ( empty( $_POST['a1woocog_save_settings'] ) ) {
            return;
        }
        if ( !current_user_can( 'manage_woocommerce' ) ) {
            wp_die( esc_html__( 'Permission denied.', 'a1-profit-reports-for-woocommerce' ) );
        }
        wp_die( esc_html( A1WooCOG_License::reports_upsell_message() ) );
    }

}