<?php

declare(strict_types=1);

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

use Brain\Monkey\Functions;
use Closure;
use LIT\MCP\Abilities\Errors;
use LIT\MCP\Integrations\Divi\Design\DesignChange;
use LIT\MCP\Integrations\Divi\Design\DesignSystemWriter;
use LIT\MCP\Integrations\Divi\Design\DetachRewrite;
use LIT\MCP\Integrations\Divi\Design\DiviDesignDetachAbility;
use LIT\MCP\Integrations\Divi\Design\PageRewriter;
use LIT\MCP\Integrations\Divi\Design\PresetBook;
use LIT\MCP\Integrations\Divi\Design\PresetUsageQuery;
use LIT\MCP\Integrations\Divi\Design\SnapshotStore;
use LIT\MCP\Integrations\Divi\Library\GlobalUsages;
use LIT\MCP\Integrations\Divi\Library\UsageReport;
use LIT\MCP\Tests\Support\FakeChangeLog;
use LIT\MCP\Tests\Unit\TestCase;
use Mockery;
use Mockery\MockInterface;
use ReflectionProperty;

final class DiviDesignDetachAbilityTest extends TestCase
{
    private const LESETEXT = ['group' => 'font-body', 'preset' => 'Lesetext'];

    protected function setUp(): void
    {
        parent::setUp();
        Functions\when('current_user_can')->justReturn(true);
        // DesignLock (final review I-5): the lock is always free here.
        Functions\when('add_option')->justReturn(true);
        Functions\when('delete_option')->justReturn(true);
    }

    private function ability(
        PageRewriter $pages,
        ?DesignSystemWriter $writer = null,
        ?SnapshotStore $snapshots = null,
        ?FakeChangeLog $log = null
    ): DiviDesignDetachAbility {
        $usages = Mockery::mock(GlobalUsages::class);
        $usages->allows('reportFor')->andReturn(new UsageReport(0, [], 0, 0, [], 0, false));

        return new DiviDesignDetachAbility(
            $writer ?? self::readOnlyWriter(),
            new DesignChange($snapshots ?? Mockery::mock(SnapshotStore::class), $log ?? FakeChangeLog::forbidden()),
            $usages,
            $pages,
            static fn (): bool => true
        );
    }

    /** Reads PresetBookTest::stored(), never saves. */
    private static function readOnlyWriter(): DesignSystemWriter&MockInterface
    {
        $writer = Mockery::mock(DesignSystemWriter::class);
        $writer->allows('presets')->andReturn(PresetBookTest::stored());
        $writer->allows('canUseVisualBuilder')->andReturn(true);
        $writer->expects('savePresets')->never();

        return $writer;
    }

    private static function untouched(): PageRewriter&MockInterface
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')->never();
        $pages->expects('apply')->never();

        return $pages;
    }

    /** Matches the explicit-only query and a DetachRewrite strategy of a preview()/apply() call. */
    private static function explicitQuery(): Closure
    {
        return static function (PresetUsageQuery $query): bool {
            $targets = (new ReflectionProperty(PresetUsageQuery::class, 'targets'))->getValue($query);

            return array_column($targets, 'default') === [false];
        };
    }

    private static function detaching(): Closure
    {
        return static fn (Closure $rewrite): bool => $rewrite() instanceof DetachRewrite;
    }

    public function testNeedsEditThemeOptionsAndTheVisualBuilder(): void
    {
        $ability = $this->ability(self::untouched());
        Functions\when('current_user_can')->justReturn(false);

        self::assertToolError($ability->permission(['preset' => self::LESETEXT]), 'forbidden');
        self::assertToolError($ability->execute(['preset' => self::LESETEXT]), 'forbidden');
    }

    public function testVariablesFollowWithStage4c(): void
    {
        $error = self::assertToolError(
            $this->ability(self::untouched())->execute(['variable' => 'Eckenradius']),
            'unsupported'
        );

        self::assertStringContainsString('Variablen folgen mit Etappe 4c.', $error['hint']);
    }

    public function testUnknownAndAmbiguousPresets(): void
    {
        $ability = $this->ability(self::untouched());

        $unknown = $ability->execute(['preset' => ['module' => 'button', 'preset' => 'Fehlt']]);
        self::assertToolError($unknown, 'not_found');
        $ambiguous = $ability->execute(['preset' => ['module' => 'button', 'preset' => 'Doppelt']]);
        self::assertToolError($ambiguous, 'validation_failed');
        self::assertStringContainsString('bbbbbbbbbb, cccccccccc', self::errorFields($ambiguous)['preset.preset']);
        $form = $ability->execute(['preset' => ['preset' => 'Lesetext']]);
        self::assertArrayHasKey('preset', self::errorFields($form));
    }

    public function testDryRunListsPagesAndTheDiffOfTheNestingPresets(): void
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')
            ->with(Mockery::on(self::explicitQuery()), Mockery::on(self::detaching()), null)
            ->andReturn(PageRewriteReportTest::preview(1));
        $pages->expects('apply')->never();

        $dry = self::assertToolError($this->ability($pages)->execute(['preset' => self::LESETEXT]), 'confirm_required');

        self::assertSame(12, $dry['pages'][0]['post_id']);
        self::assertSame([['dddddddddd', 'changed']], array_map(
            static fn (array $row): array => [$row['id'], $row['action']],
            $dry['diff']
        ));
        self::assertSame(PresetBook::fromDivi(PresetBookTest::stored())->rev(), $dry['design_rev']);
        self::assertStringContainsString('design_rev', $dry['message']);
        self::assertSame([], $dry['warnings']);
    }

    public function testConfirmWithAStaleDesignRevWritesNeitherPresetsNorPages(): void
    {
        $error = self::assertToolError(
            $this->ability(self::untouched())->execute([
                'preset' => self::LESETEXT,
                'confirm' => true,
                'design_rev' => 'veraltet',
            ]),
            'rev_mismatch'
        );

        self::assertStringContainsString('nichts wurde gespeichert', $error['message']);
    }

    public function testConfirmRemovesTheNestedReferencesFirstThenThePages(): void
    {
        $calls = [];
        $writer = Mockery::mock(DesignSystemWriter::class);
        $writer->allows('presets')->andReturn(PresetBookTest::stored());
        $writer->allows('canUseVisualBuilder')->andReturn(true);
        $writer->expects('savePresets')
            ->with(
                Mockery::on(static fn (array $rest): bool => $rest['module'][1]['items'][0]['groupPresets'] === []),
                false
            )
            ->andReturnUsing(static function () use (&$calls): array {
                $calls[] = 'presets';

                return PresetBook::fromDivi(PresetBookTest::stored())->withoutNestedRef('gggggggggg')->data();
            });
        $snapshots = Mockery::mock(SnapshotStore::class);
        $snapshots->expects('save')->andReturn('presets-4');
        $snapshots->expects('attachLog');
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')->andReturn(PageRewriteReportTest::preview(1));
        $pages->expects('apply')
            ->with(
                'lit/divi-design-detach',
                Mockery::on(self::explicitQuery()),
                Mockery::on(self::detaching()),
                null,
                'Entkoppeln von Gruppen-Preset divi/font-body „Lesetext“'
            )
            ->andReturnUsing(static function () use (&$calls): array {
                $calls[] = 'pages';

                return PageRewriteReportTest::applied(1, 0);
            });
        $ability = $this->ability($pages, $writer, $snapshots, new FakeChangeLog(7));

        $dry = self::assertToolError($ability->execute(['preset' => self::LESETEXT]), 'confirm_required');
        $result = $ability->execute([
            'preset' => self::LESETEXT,
            'confirm' => true,
            'design_rev' => $dry['design_rev'],
        ]);

        self::assertSame(['presets', 'pages'], $calls);
        self::assertSame('presets-4', $result['snapshot_id']);
        self::assertSame(7, $result['log_id']);
        self::assertSame('dddddddddd', $result['diff'][0]['id']);
        self::assertSame(12, $result['saved'][0]['post_id']);
        self::assertStringStartsWith('Presets: 1 geändert.', $result['summary']);
        self::assertStringEndsWith('Jetzt kann lit/divi-presets-delete das Preset löschen.', $result['summary']);
    }

    public function testAPageErrorAfterThePresetStepSaysThePresetsAreChanged(): void
    {
        $writer = Mockery::mock(DesignSystemWriter::class);
        $writer->allows('presets')->andReturn(PresetBookTest::stored());
        $writer->allows('canUseVisualBuilder')->andReturn(true);
        $writer->expects('savePresets')
            ->andReturn(PresetBook::fromDivi(PresetBookTest::stored())->withoutNestedRef('gggggggggg')->data());
        $snapshots = Mockery::mock(SnapshotStore::class);
        $snapshots->expects('save')->andReturn('presets-4');
        $snapshots->expects('attachLog');
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('apply')->andReturn(Errors::partialWrite('Seite 13 nicht gespeichert.', 13));
        $rev = PresetBook::fromDivi(PresetBookTest::stored())->rev();

        $error = self::assertToolError(
            $this->ability($pages, $writer, $snapshots, new FakeChangeLog(7))->execute([
                'preset' => self::LESETEXT,
                'confirm' => true,
                'design_rev' => $rev,
            ]),
            'partial_write'
        );

        self::assertStringContainsString('bereits entfernt (Snapshot presets-4)', $error['message']);
        self::assertSame('presets-4', $error['snapshot_id']);
        self::assertSame(13, $error['post_id']);
    }

    public function testPostIdsTouchOnlyThePages(): void
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')
            ->with(Mockery::on(self::explicitQuery()), Mockery::on(self::detaching()), [12])
            ->andReturn(PageRewriteReportTest::preview(1));
        $pages->expects('apply')
            ->with('lit/divi-design-detach', Mockery::any(), Mockery::any(), [12], Mockery::type('string'))
            ->andReturn(PageRewriteReportTest::applied(1, 0));
        $ability = $this->ability($pages);
        $input = ['preset' => self::LESETEXT, 'post_ids' => [12]];

        $dry = self::assertToolError($ability->execute($input), 'confirm_required');
        self::assertArrayNotHasKey('diff', $dry);

        $result = $ability->execute($input + ['confirm' => true]);
        self::assertSame([], $result['diff']);
        self::assertNull($result['design_rev']);
        self::assertNull($result['snapshot_id']);
        self::assertStringNotContainsString('lit/divi-presets-delete', $result['summary']);
    }

    public function testADefaultPresetLosesOnlyItsExplicitReferences(): void
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')
            ->with(Mockery::on(self::explicitQuery()), Mockery::on(self::detaching()), null)
            ->andReturn(PageRewriteReportTest::preview(1));

        $dry = self::assertToolError(
            $this->ability($pages)->execute(['preset' => ['module' => 'text', 'preset' => 'Fließtext']]),
            'confirm_required'
        );

        self::assertSame(
            ['„Fließtext“ ist das Standard-Preset von divi/text: Divi wendet es weiter auf Module ohne eigenes '
                . 'Preset an; entfernt werden nur die ausdrücklichen Verweise.'],
            $dry['warnings']
        );
        self::assertArrayNotHasKey('diff', $dry, 'module presets are never nested');
    }

    public function testNothingLeftIsNoConfirmAndPointsToDelete(): void
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('preview')->andReturn(PageRewriteReportTest::preview(0));

        $result = $this->ability($pages)->execute(['preset' => ['module' => 'button', 'preset' => 'CTA primär']]);

        self::assertTrue($result['ok']);
        self::assertSame(
            'Keine Verweise auf Modul-Preset divi/button „CTA primär“ gefunden – nichts zu tun. Jetzt kann '
                . 'lit/divi-presets-delete das Preset löschen.',
            $result['summary']
        );
    }

    public function testRemainingPagesAskForAnotherCallWithoutTheDeleteHint(): void
    {
        $pages = Mockery::mock(PageRewriter::class);
        $pages->expects('apply')->andReturn(PageRewriteReportTest::applied(2, 2));

        $result = $this->ability($pages)->execute([
            'preset' => ['module' => 'button', 'preset' => 'CTA primär'],
            'confirm' => true,
        ]);

        self::assertSame(2, $result['remaining']);
        self::assertStringContainsString('Noch 2 Seiten offen', $result['summary']);
        self::assertStringNotContainsString('lit/divi-presets-delete', $result['summary']);
    }

    public function testSchemaAndMeta(): void
    {
        $ability = $this->ability(self::untouched());
        $schema = $ability->inputSchema();

        self::assertSame('lit/divi-design-detach', $ability->name());
        self::assertFalse($ability->isDirect());
        self::assertSame(['readonly' => false, 'destructive' => false, 'idempotent' => true], $ability->annotations());
        self::assertFalse($schema['additionalProperties']);
        self::assertSame(['preset'], $schema['properties']['preset']['required']);
        self::assertArrayHasKey('design_rev', $schema['properties']);
        self::assertArrayHasKey('variable', $schema['properties']);
        self::assertSame(['saved', 'remaining', 'skipped'], array_slice($ability->outputSchema()['required'], -3));
        self::assertStringContainsString('lit/divi-presets-delete', $ability->description());
    }
}