<?php

declare(strict_types=1);

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

use Brain\Monkey\Functions;
use LIT\MCP\Abilities\Rev;
use LIT\MCP\Integrations\Divi\Library\GlobalEdits;
use LIT\MCP\Integrations\Divi\Library\GlobalUsages;
use LIT\MCP\Integrations\Divi\Pages\DiviDeleteAbility;
use LIT\MCP\Integrations\Divi\Pages\DiviDuplicateNodeAbility;
use LIT\MCP\Integrations\Divi\Pages\DiviReplaceTextAbility;
use LIT\MCP\Integrations\Divi\Pages\DiviSaver;
use LIT\MCP\Integrations\Divi\Pages\DiviUpdateAbility;
use LIT\MCP\Integrations\Divi\Pages\DiviWriter;
use LIT\MCP\Integrations\Divi\Pages\SaveScope;
use LIT\MCP\Tests\Support\DiviFixtures;
use LIT\MCP\Tests\Support\DiviWriterFixture;
use LIT\MCP\Tests\Support\LibraryFixtures;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use WP_Post;

/** The Divi write tools on library entries (E2, answer F2). */
final class GlobalEditsTest extends TestCase
{
    /** @var list<array{string, SaveScope}> Content and scope handed to the saver. */
    private array $saved = [];

    private int $backups = 0;

    /** @var list<int> Published pages that show the global entry (ruling P8). */
    private array $published = [1053];

    private bool $trash = true;

    protected function setUp(): void
    {
        parent::setUp();
        Functions\when('wp_revisions_enabled')->justReturn(true);
    }

    private function usages(): GlobalUsages
    {
        $usages = Mockery::mock(GlobalUsages::class);
        $usages->allows('of')->andReturn([
            'items' => [
                ['post_id' => 1053, 'title' => 'Globale Instanzen', 'status' => 'publish', 'type' => 'page'],
                ['post_id' => 1070, 'title' => '(nicht lesbar)', 'status' => 'draft', 'type' => 'page'],
            ],
            'count' => 2,
        ]);
        $usages->allows('publishedIds')->andReturnUsing(fn (): array => $this->published);

        return $usages;
    }

    /** @param list<string> $deniedRoles */
    private function writer(bool $writable = true, array $deniedRoles = []): DiviWriter
    {
        $saver = Mockery::mock(DiviSaver::class);
        $saver->allows('save')->andReturnUsing(function (WP_Post $post, string $content, SaveScope $scope): array {
            $this->saved[] = [$content, $scope];
            $post->post_content = $content;

            return ['revision_id' => 811, 'warnings' => []];
        });
        $access = LibraryFixtures::access($deniedRoles, $writable);
        $design = DiviWriterFixture::designReader();
        $globals = new GlobalEdits(
            $access,
            $this->usages(),
            function (WP_Post $item): int {
                ++$this->backups;

                return 1071;
            },
            trashEnabled: fn (): bool => $this->trash
        );

        return new DiviWriter(
            LibraryFixtures::loader($access),
            $saver,
            DiviWriterFixture::log(),
            $design,
            DiviWriterFixture::composition($design),
            $globals
        );
    }

    private static function rev(int $id): string
    {
        return Rev::of((string) LibraryFixtures::item($id)->post_content);
    }

    /** @return array<string, mixed> */
    private static function relabel(int $id, bool $confirm = false): array
    {
        return array_merge(
            ['post_id' => $id, 'tree_rev' => self::rev($id), 'changes' => [['id' => 'm0', 'label' => 'Neu']]],
            $confirm ? ['confirm' => true] : []
        );
    }

    /** A user with every capability but $cap on the posts $ids. */
    private static function denyOn(string $cap, array $ids): void
    {
        Functions\when('current_user_can')->alias(
            static fn (string $asked, mixed ...$args): bool => ! ($asked === $cap
                && ($ids === [] || in_array((int) ($args[0] ?? 0), $ids, true)))
        );
    }

    public function testPlainLibraryItemIsSavedWithoutConfirmAndWithoutDiviFlags(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1057)]);

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1057));

        self::assertTrue($result['ok']);
        self::assertSame(SaveScope::LibraryItem, $this->saved[0][1]);
        self::assertStringStartsWith('<!-- wp:divi/placeholder --><!-- wp:divi/blurb ', $this->saved[0][0]);
        self::assertArrayNotHasKey('affected', $result);
    }

    public function testGlobalItemDryRunNamesTheAffectedPagesAndSavesNothing(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059));

        self::assertToolError($result, 'confirm_required');
        self::assertStringContainsString('wirkt sofort auf 2 Seiten', $result->get_error_message());
        self::assertSame(1053, $result->get_error_data()['affected'][0]['post_id']);
        self::assertSame(2, $result->get_error_data()['affected_count']);
        self::assertSame([], $this->saved);
    }

    public function testConfirmedGlobalEditClearsEveryPageAndKeepsARevision(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertTrue($result['ok']);
        self::assertSame(SaveScope::GlobalItem, $this->saved[0][1]);
        self::assertSame(811, $result['revision_id']);
        self::assertSame(2, $result['affected_count']);
        self::assertArrayNotHasKey('backup_id', $result);
        self::assertSame(0, $this->backups);
    }

    public function testWithoutRevisionsABackupIsMadeFirst(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        LibraryFixtures::given([LibraryFixtures::item(1059)]);

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertSame(1071, $result['backup_id']);
        self::assertSame(1, $this->backups);
    }

    /** Ruling P9 (M-6): PostCloner's backup goes through kses – for these users it would not be byte-faithful. */
    public function testWithoutRevisionsAUserWithoutUnfilteredHtmlIsRefused(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        LibraryFixtures::given([LibraryFixtures::item(1059)]);
        self::denyOn('unfiltered_html', []);

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertToolError($result, 'unsupported');
        self::assertStringContainsString('Revisionen', $result->get_error_message());
        self::assertSame(0, $this->backups);
        self::assertSame([], $this->saved);
    }

    /** Ruling P9 (M-7): with the trash disabled the backup would be deleted at once. */
    public function testWithoutRevisionsADisabledTrashIsRefused(): void
    {
        Functions\when('wp_revisions_enabled')->justReturn(false);
        LibraryFixtures::given([LibraryFixtures::item(1059)]);
        $this->trash = false;

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertToolError($result, 'unsupported');
        self::assertStringContainsString('Papierkorb', $result->get_error_message());
        self::assertSame(0, $this->backups);
        self::assertSame([], $this->saved);
    }

    /** Revisions on: neither unfiltered_html nor the trash matter (the revision is taken in the kses window). */
    public function testWithRevisionsAFilteredUserMayConfirm(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);
        self::denyOn('unfiltered_html', []);
        $this->trash = false;

        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertTrue($result['ok']);
        self::assertSame(SaveScope::GlobalItem, $this->saved[0][1]);
    }

    /** Ruling P8: a confirmed global edit needs edit_post on every published page that shows the entry. */
    public function testConfirmIsRefusedWhenAPublishedPageShowingTheEntryIsNotEditable(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);
        $this->published = [1053, 1080];
        self::denyOn('edit_post', [1080]);

        $dryRun = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059));
        $result = (new DiviUpdateAbility($this->writer()))->execute(self::relabel(1059, true));

        self::assertToolError($dryRun, 'confirm_required', 'the dry run stays unchanged');
        self::assertToolError($result, 'forbidden');
        self::assertStringContainsString('1080', $result->get_error_message());
        self::assertStringNotContainsString('1053', $result->get_error_message());
        self::assertSame([], $this->saved);
        self::assertSame(0, $this->backups);
    }

    public function testRefusesToEmptyOrDoubleTheRoot(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1058)]);

        $emptied = (new DiviDeleteAbility($this->writer()))->execute(
            ['post_id' => 1058, 'tree_rev' => self::rev(1058), 'ids' => ['s0'], 'confirm' => true]
        );
        $doubled = (new DiviDuplicateNodeAbility($this->writer()))->execute(
            ['post_id' => 1058, 'tree_rev' => self::rev(1058), 'id' => 's0', 'confirm' => true]
        );

        self::assertToolError($emptied, 'validation_failed');
        self::assertStringContainsString('nicht leer', $emptied->get_error_message());
        self::assertToolError($doubled, 'validation_failed');
        self::assertStringContainsString('genau ein divi/section', $doubled->get_error_message());
        self::assertSame([], $this->saved);
    }

    public function testDeleteInAGlobalItemNamesTheAffectedPagesBeforeConfirm(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1058)]);

        $result = (new DiviDeleteAbility($this->writer()))->execute(
            ['post_id' => 1058, 'tree_rev' => self::rev(1058), 'ids' => ['s0.r0.c0.m1']]
        );

        self::assertToolError($result, 'confirm_required');
        self::assertStringContainsString('Globaler Bibliothekseintrag: wirkt auf 2 Seiten', $result->get_error_message());
        self::assertSame(['s0.r0.c0.m1'], $result->get_error_data()['nodes']);
        self::assertCount(2, $result->get_error_data()['affected']);
    }

    public function testConfirmWithAStaleTreeRevWritesNothing(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);

        $result = (new DiviUpdateAbility($this->writer()))->execute(
            ['tree_rev' => 'abcdef012345'] + self::relabel(1059, true)
        );

        self::assertToolError($result, 'rev_mismatch');
        self::assertSame([], $this->saved);
    }

    public function testGlobalItemsNeedEditGlobalLibraryAndAWritableGroup(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059), LibraryFixtures::item(1057)]);

        self::assertToolError(
            (new DiviUpdateAbility($this->writer(true, ['edit_global_library'])))->permission(self::relabel(1059)),
            'forbidden'
        );
        self::assertToolError((new DiviUpdateAbility($this->writer(false)))->permission(self::relabel(1057)), 'forbidden');
        self::assertTrue(
            (new DiviUpdateAbility($this->writer(true, ['edit_global_library'])))->permission(self::relabel(1057))
        );
    }

    public function testTheOutputSchemaDeclaresTheGlobalFields(): void
    {
        $properties = (new DiviUpdateAbility($this->writer()))->outputSchema()['properties'];

        self::assertSame('array', $properties['affected']['type']);
        self::assertSame('integer', $properties['affected_count']['type']);
        self::assertSame('integer', $properties['backup_id']['type']);
    }

    /** Ruling P1: lit-divi-replace-text saves library entries through DiviWriter::commit(). */
    public function testReplaceTextSavesAPlainLibraryItemWithoutDiviFlags(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1057)]);

        $result = $this->replaceText('Library-Modul', 'Bibliotheksmodul', 1057);

        self::assertTrue($result['results'][0]['ok'], (string) ($result['results'][0]['error'] ?? ''));
        self::assertSame(1, $result['results'][0]['count']);
        self::assertSame(SaveScope::LibraryItem, $this->saved[0][1]);
        self::assertStringContainsString('Bibliotheksmodul', $this->saved[0][0]);
    }

    /** Ruling P1 / answer F2: a global entry is never changed without the dry run that names its pages. */
    public function testReplaceTextNeverChangesAGlobalItemAndNamesItsPages(): void
    {
        LibraryFixtures::given([LibraryFixtures::item(1059)]);

        $result = $this->replaceText('Öffnungszeiten', 'Zeiten', 1059);

        $entry = $result['results'][0];
        self::assertFalse($entry['ok']);
        self::assertStringContainsString('wirkt sofort auf 2 Seiten', $entry['error']);
        self::assertStringContainsString('lit-divi-update', $entry['error']);
        self::assertSame(2, $entry['affected_count']);
        self::assertSame(1053, $entry['affected'][0]['post_id']);
        self::assertSame([], $this->saved);
        self::assertSame(0, $this->backups);
    }

    /** @return array<string, mixed> */
    private function replaceText(string $search, string $replace, int $id): array
    {
        Functions\when('get_post_type_object')->justReturn(
            (object) ['cap' => (object) ['edit_posts' => 'edit_pages', 'edit_others_posts' => 'edit_others_pages']]
        );
        $writer = $this->writer();
        $ability = new DiviReplaceTextAbility(
            DiviFixtures::schema(),
            LibraryFixtures::loader(LibraryFixtures::access()),
            $writer,
            Mockery::mock(\wpdb::class)->makePartial()
        );

        return $ability->execute([
            'search' => $search,
            'replace' => $replace,
            'dry_run' => false,
            'confirm' => true,
            'targets' => [['post_id' => $id, 'tree_rev' => self::rev($id)]],
        ]);
    }
}