<?php

declare(strict_types=1);

namespace LIT\MCP\Tests\Unit\Integrations\Divi\Library;

use Brain\Monkey\Functions;
use LIT\MCP\Integrations\Divi\Library\GlobalUsages;
use LIT\MCP\Tests\Support\LibraryFixtures;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use WP_Post;

final class GlobalUsagesTest extends TestCase
{
    /**
     * Ruling P23 (re-review F1): candidates by a wide, fail-closed prefilter (ID, status and type
     * only), then their content in chunks, parsed in PHP (UsageMatcher) – every format Divi renders.
     */
    public function testFindsEveryFormatDiviRendersFromCandidates(): void
    {
        $bs = chr(92);
        $contents = [
            1053 => '<!-- wp:divi/global-layout {"globalModule":"1058","blockName":"divi/text"} /-->',
            1054 => '[et_pb_section global_module="01058"][/et_pb_section]',
            1055 => '<!-- wp:divi/global-layout {"' . $bs . 'u0067lobalModule":"1058"} /-->',
            1056 => '<!-- wp:divi/global-layout {"globalModule":"' . $bs . 'u00310' . '58"} /-->',
            1057 => '<!-- wp:divi/global-layout {"globalModule":"1059"} /-->',
            1061 => '<!-- wp:divi/global-layout {"' . $bs . 'u0067lobalModule":"1058",} /-->',
        ];
        $db = Mockery::mock(\wpdb::class)->makePartial();
        $queries = [];
        $db->allows('get_results')->andReturnUsing(static function (string $sql) use (&$queries, $contents): array {
            $queries[] = $sql;
            if (str_contains($sql, 'post_content FROM')) {
                preg_match('/IN \(([0-9, ]+)\)/', $sql, $in);
                $ids = array_map('intval', explode(',', $in[1]));

                return array_map(static fn (int $id): array => ['ID' => (string) $id, 'post_content' => $contents[$id]], $ids);
            }

            return array_map(
                static fn (int $id): array => ['ID' => (string) $id, 'post_status' => 'publish', 'post_type' => 'page'],
                array_keys($contents)
            );
        });

        $rows = (new GlobalUsages($db))->rows(1058);

        self::assertSame([1053, 1054, 1055, 1056, 1061], array_column($rows, 'id'), '1061: undecodable, fail closed');
        self::assertStringStartsWith('SELECT ID, post_status, post_type FROM', $queries[0]);
        self::assertStringNotContainsString('post_content,', $queries[0]);
        // Ruling P24: case-insensitive whatever the column collation.
        self::assertStringContainsString("LOWER(post_content) LIKE '%globalmodule%'", $queries[0]);
        self::assertStringContainsString("LOWER(post_content) LIKE '%global" . $bs . "_module%'", $queries[0]);
        self::assertStringContainsString("post_content REGEXP '" . $bs . $bs . 'u00[4-7][0-9a-fA-F]' . "'", $queries[0]);
        self::assertStringContainsString("post_status NOT IN ('trash', 'auto-draft', 'inherit')", $queries[0]);
        self::assertStringContainsString("post_type <> 'revision'", $queries[0]);
        self::assertCount(2, $queries, 'one candidate query, one content chunk');
    }

    /** Audit L1: contents are read in chunks; beyond the parse cap candidates count as references. */
    public function testReadsContentsInChunksAndFailsClosedBeyondTheCap(): void
    {
        $total = GlobalUsages::PARSE_CAP + 3;
        $db = Mockery::mock(\wpdb::class)->makePartial();
        $chunks = 0;
        $db->allows('get_results')->andReturnUsing(static function (string $sql) use (&$chunks, $total): array {
            if (str_contains($sql, 'post_content FROM')) {
                ++$chunks;
                preg_match('/IN \(([0-9, ]+)\)/', $sql, $in);

                return array_map(
                    static fn (string $id): array => ['ID' => trim($id), 'post_content' => 'nichts'],
                    explode(',', $in[1])
                );
            }

            return array_map(
                static fn (int $id): array => ['ID' => (string) $id, 'post_status' => 'draft', 'post_type' => 'page'],
                range(1, $total)
            );
        });

        $rows = (new GlobalUsages($db))->rows(1058);

        self::assertSame((int) ceil(GlobalUsages::PARSE_CAP / GlobalUsages::CONTENT_CHUNK), $chunks);
        self::assertSame(range(GlobalUsages::PARSE_CAP + 1, $total), array_column($rows, 'id'));
    }

    /** Audit L4: readable posts with title, unreadable ones only counted. */
    public function testListsReadablePostsAndCountsTheOthers(): void
    {
        $usages = LibraryFixtures::usages([
            ['id' => 1053, 'status' => 'draft', 'type' => 'page'],
            ['id' => 1061, 'status' => 'private', 'type' => 'et_header_layout'],
        ]);
        Functions\when('get_post')->alias(
            static fn (int $id): WP_Post => new WP_Post(['ID' => $id, 'post_title' => 'Titel ' . $id])
        );
        Functions\when('current_user_can')->alias(
            static fn (string $cap, ?int $id = null): bool => $id !== 1061
        );

        $report = $usages->report(1058);

        self::assertSame(2, $report->count);
        self::assertSame(
            [['post_id' => 1053, 'title' => 'Titel 1053', 'status' => 'draft', 'type' => 'page']],
            $report->items
        );
        self::assertSame(1, $report->hidden);
        self::assertSame(1, $report->live);
        self::assertSame([], $report->blocked);
        self::assertSame(1, $report->blockedHidden);
        self::assertSame(
            ['affected' => $report->items, 'affected_count' => 2, 'hidden_count' => 1, 'blocked_hidden_count' => 1],
            $report->details()
        );
    }

    /** Audit L1: rights are checked in chunks, each with its own primed cache that is dropped afterwards. */
    public function testChecksLargeSetsInChunksAndReleasesTheCache(): void
    {
        $usages = LibraryFixtures::usages(LibraryFixtures::rows(range(1, 450)));
        $primed = [];
        Functions\when('_prime_post_caches')->alias(static function (array $ids) use (&$primed): void {
            $primed[] = count($ids);
        });
        $deleted = 0;
        Functions\when('wp_cache_delete')->alias(static function () use (&$deleted): bool {
            ++$deleted;

            return true;
        });
        Functions\when('get_post')->justReturn(null);
        Functions\when('current_user_can')->alias(static fn (string $cap, int $id): bool => $id % 100 !== 0);

        $report = $usages->report(1058);

        self::assertSame([GlobalUsages::CHUNK, GlobalUsages::CHUNK, 50], $primed);
        self::assertSame(450, $deleted);
        self::assertSame(450, $report->count);
        self::assertCount(GlobalUsages::LIMIT, $report->items);
        self::assertSame(4, $report->hidden);
        self::assertSame(4, $report->blockedHidden);
        self::assertTrue($report->blocks());
    }

    /** Audit L1: above the hard cap nothing is checked for edit_post, and the report blocks. */
    public function testAboveTheHardCapNoPostIsCheckedForEditing(): void
    {
        $usages = LibraryFixtures::usages(LibraryFixtures::rows(range(1, GlobalUsages::HARD_CAP + 1)));
        Functions\when('get_post')->justReturn(null);
        $asked = [];
        Functions\when('current_user_can')->alias(static function (string $cap) use (&$asked): bool {
            $asked[$cap] = ($asked[$cap] ?? 0) + 1;

            return true;
        });

        $report = $usages->report(1058);

        self::assertTrue($report->tooMany);
        self::assertTrue($report->blocks());
        self::assertArrayNotHasKey('edit_post', $asked);
        self::assertSame(GlobalUsages::CHECK_CAP, $asked['read_post']);
    }

    /** @return list<array{id: int, status: string, type: string}> */
    private static function themeBuilderRows(): array
    {
        return [
            ['id' => 1053, 'status' => 'publish', 'type' => 'page'],
            ['id' => 1061, 'status' => 'publish', 'type' => 'et_header_layout'],
            ['id' => 1062, 'status' => 'publish', 'type' => 'et_body_layout'],
            ['id' => 1063, 'status' => 'publish', 'type' => 'et_footer_layout'],
            ['id' => 1064, 'status' => 'publish', 'type' => 'et_template'],
        ];
    }

    /**
     * Audit L6, ruling Q17 M1 (review I-2): without an injected Theme Builder access, Theme Builder rows need what
     * ThemeBuilderAccess::canUse() needs – Divi's role option theme_builder, edit_others_posts and
     * edit_theme_options; without them they are neither listed nor named, only counted – and still block.
     */
    public function testThemeBuilderRowsNeedTheThemeBuilderRightsByDefault(): void
    {
        Functions\when('get_post')->justReturn(null);
        Functions\when('current_user_can')->justReturn(true);

        $with = LibraryFixtures::usages(self::themeBuilderRows(), LibraryFixtures::roles())->report(1058);
        self::assertSame([], $with->blocked);
        self::assertCount(5, $with->items);

        $without = LibraryFixtures::usages(self::themeBuilderRows(), LibraryFixtures::roles(['theme_builder']))
            ->report(1058);
        self::assertSame([1053], array_column($without->items, 'post_id'));
        self::assertSame([], $without->blocked);
        self::assertSame(4, $without->hidden);
        self::assertSame(4, $without->blockedHidden);
        self::assertTrue($without->blocks());

        Functions\when('current_user_can')->alias(static fn (string $cap): bool => $cap !== 'edit_theme_options');
        $noThemeOptions = LibraryFixtures::usages(self::themeBuilderRows(), LibraryFixtures::roles())->report(1058);
        self::assertSame(4, $noThemeOptions->blockedHidden);
        self::assertSame([], $noThemeOptions->blocked);
    }

    /** Ruling Q17 M1: a Theme Builder row the account may see but not use (no edit right in the TB) blocks by ID. */
    public function testAVisibleButUnusableThemeBuilderRowBlocksByItsId(): void
    {
        Functions\when('get_post')->justReturn(null);
        Functions\when('current_user_can')->justReturn(true);
        $asked = 0;
        $themeBuilder = static function () use (&$asked): array {
            ++$asked;

            return ['visible' => true, 'usable' => false];
        };

        $report = LibraryFixtures::usages(self::themeBuilderRows(), null, $themeBuilder)->report(1058);

        self::assertCount(5, $report->items);
        self::assertSame([1061, 1062, 1063, 1064], $report->blocked);
        self::assertSame(1, $asked, 'evaluated once per report');
    }

    /** Review I-2 scenario B: without Theme Builder visibility a TB row is only counted – never its ID, title or type. */
    public function testWithoutThemeBuilderVisibilityRowsAreOnlyCounted(): void
    {
        Functions\when('get_post')->alias(
            static fn (int $id): WP_Post => new WP_Post(['ID' => $id, 'post_title' => 'Titel ' . $id])
        );
        Functions\when('current_user_can')->justReturn(true);

        $report = LibraryFixtures::usages(
            self::themeBuilderRows(),
            null,
            static fn (): array => ['visible' => false, 'usable' => false]
        )->report(1058);

        self::assertSame(
            [['post_id' => 1053, 'title' => 'Titel 1053', 'status' => 'publish', 'type' => 'page']],
            $report->items
        );
        self::assertSame(4, $report->hidden);
        self::assertSame([], $report->blocked);
        self::assertSame(4, $report->blockedHidden);
        $json = (string) json_encode($report->details());
        self::assertStringNotContainsString('1061', $json);
        self::assertStringNotContainsString('et_header_layout', $json);
    }

    /** A page row is unaffected by the Theme Builder access. */
    public function testPageRowsIgnoreTheThemeBuilderAccess(): void
    {
        Functions\when('get_post')->justReturn(null);
        Functions\when('current_user_can')->alias(static fn (string $cap, mixed $id = null): bool => $cap !== 'edit_post');
        $asked = 0;
        $themeBuilder = static function () use (&$asked): array {
            ++$asked;

            return ['visible' => false, 'usable' => false];
        };

        $report = LibraryFixtures::usages(LibraryFixtures::rows([1053]), null, $themeBuilder)->report(1058);

        self::assertSame([1053], array_column($report->items, 'post_id'));
        self::assertSame([1053], $report->blocked);
        self::assertSame(0, $asked, 'no Theme Builder row, no Theme Builder check');
    }

    public function testAListingSkipsTheEditChecks(): void
    {
        $usages = LibraryFixtures::usages(LibraryFixtures::rows([1053]));
        Functions\when('get_post')->justReturn(null);
        Functions\when('current_user_can')->alias(static fn (string $cap): bool => $cap !== 'edit_post');

        $report = $usages->report(1058, false);

        self::assertFalse($report->blocks());
        self::assertSame(['affected', 'affected_count'], array_keys($report->listing()));
    }

    public function testRowsForUsesTheConditionAndMatcherOfTheQuery(): void
    {
        $db = Mockery::mock(\wpdb::class)->makePartial();
        $queries = [];
        $db->allows('get_results')->andReturnUsing(static function (string $sql) use (&$queries): array {
            $queries[] = $sql;

            return str_contains($sql, 'post_content FROM')
                ? [['ID' => '5', 'post_content' => 'treffer'], ['ID' => '6', 'post_content' => 'nichts']]
                : [['ID' => '5', 'post_status' => 'draft', 'post_type' => 'page'],
                    ['ID' => '6', 'post_status' => 'draft', 'post_type' => 'page']];
        });
        $query = new class implements \LIT\MCP\Integrations\Divi\Library\UsageQuery {
            public function candidateCondition(\wpdb $db): string
            {
                return '(MARKER)';
            }

            public function matches(string $content): bool
            {
                return $content === 'treffer';
            }
        };

        $rows = (new GlobalUsages($db))->rowsFor($query);

        self::assertSame([['id' => 5, 'status' => 'draft', 'type' => 'page']], $rows);
        self::assertStringContainsString('WHERE (MARKER) AND post_type', $queries[0]);
    }
}