<?php

declare(strict_types=1);

namespace Tests\Feature\FormBuilder\Options;

use App\Models\FormBuilder\FormSchema;
use App\Models\Organisation;
use App\Support\Json\JsonCanonicalizer;
use Illuminate\Foundation\Testing\RefreshDatabaseState;
use Illuminate\Support\Facades\Artisan;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Illuminate\Support\Str;
use Tests\TestCase;

/**
 * Rolls back the WS-5d backfill migration, seeds pre-WS-5d JSON into
 * `form_fields.options`, `form_field_library.options`, and the
 * snapshot blobs, then runs the migration forward and back asserting:
 *
 *   - Forward: rows land in form_field_options with the correct
 *     owner_type/owner_id/value/label/sort_order and translations
 *     stripped from the per-locale parallel options[] arrays;
 *     snapshots rewritten to rich shape.
 *   - Backward: the rollback pair reconstructs the pre-WS-5d JSON
 *     shape on every owner row + snapshot.
 */
final class FormFieldOptionsBackfillTest extends TestCase
{
    // Migration tests run DDL inside the test body; RefreshDatabase + MySQL
    // implicit-commit the savepoint, breaking ROLLBACK TO SAVEPOINT at
    // end-of-test (1305 SAVEPOINT does not exist). Use migrate:fresh per
    // test for a clean baseline without the txn wrapper.
    //
    // RefreshDatabaseState::$migrated = false forces the NEXT RefreshDatabase
    // test to re-migrate fresh, so any data this test commits doesn't leak.
    protected function setUp(): void
    {
        parent::setUp();
        Artisan::call('migrate:fresh');
        RefreshDatabaseState::$migrated = false;
    }

    public function test_forward_migration_backfills_rows_strips_translations_and_rewrites_snapshots(): void
    {
        // Roll back only the backfill migration (latest WS-5d step).
        // Leaves the form_field_options table in place, JSON columns
        // present on the source tables, and snapshots in pre-WS-5d shape.
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->assertTrue(Schema::hasTable('form_field_options'));
        $this->assertTrue(Schema::hasColumn('form_fields', 'options'));

        [$selectId, $multiId, $libraryId] = $this->seedFieldsAndLibraryWithJson();
        $submissionId = $this->seedSubmissionWithSnapshot($selectId);
        $templateId = $this->seedTemplateWithSnapshot();

        $this->artisan('migrate')->assertSuccessful();

        // Forward state: form_field_options rows present.
        $selectOptions = DB::table('form_field_options')
            ->where('owner_type', 'form_field')
            ->where('owner_id', $selectId)
            ->orderBy('sort_order')
            ->get();
        $this->assertCount(3, $selectOptions);
        $this->assertSame(['XS', 'S', 'M'], $selectOptions->pluck('value')->all());
        $this->assertSame(['XS', 'S', 'M'], $selectOptions->pluck('label')->all());
        // Translations from form_fields.translations.{locale}.options moved
        // onto each option row, indexed by sort_order.
        $small = $selectOptions->firstWhere('sort_order', 1);
        $this->assertSame(['de' => 'Klein'], json_decode((string) $small->translations, true));
        $xs = $selectOptions->firstWhere('sort_order', 0);
        $this->assertSame(['de' => 'Größe XS'], json_decode((string) $xs->translations, true));

        $multiOptions = DB::table('form_field_options')
            ->where('owner_type', 'form_field')
            ->where('owner_id', $multiId)
            ->orderBy('sort_order')
            ->get();
        $this->assertCount(2, $multiOptions);

        $libraryOptions = DB::table('form_field_options')
            ->where('owner_type', 'form_field_library')
            ->where('owner_id', $libraryId)
            ->orderBy('sort_order')
            ->get();
        $this->assertCount(2, $libraryOptions);
        $this->assertSame(['lib_a', 'lib_b'], $libraryOptions->pluck('value')->all());

        // Per-locale options[] stripped from form_fields.translations.
        $remaining = DB::table('form_fields')->where('id', $selectId)->value('translations');
        $bag = json_decode((string) $remaining, true);
        $this->assertIsArray($bag);
        foreach ($bag as $locale => $localeBag) {
            $this->assertArrayNotHasKey('options', $localeBag, "locale {$locale} retained options key");
        }

        // Submission snapshot rewritten to rich shape.
        $submission = DB::table('form_submissions')->where('id', $submissionId)->first();
        $snapshot = json_decode((string) $submission->schema_snapshot, true);
        $field = $snapshot['fields'][0];
        // RFC-WS-6 session 2.7: this snapshot was rewritten by the
        // migration's forward() (raw DB writer, not via the canonicalizing
        // service). Compare on canonical form so the assertion is
        // engine-agnostic.
        $this->assertSame(
            JsonCanonicalizer::encode([
                ['value' => 'XS', 'label' => 'XS', 'sort_order' => 0, 'translations' => ['de' => 'Größe XS']],
                ['value' => 'S', 'label' => 'S', 'sort_order' => 1, 'translations' => ['de' => 'Klein']],
                ['value' => 'M', 'label' => 'M', 'sort_order' => 2, 'translations' => ['de' => 'Mittel']],
            ]),
            JsonCanonicalizer::encode($field['options']),
        );
        // Field-level translations bag has the {locale}.options key
        // stripped.
        if (is_array($field['translations'] ?? null)) {
            foreach ($field['translations'] as $locale => $localeBag) {
                $this->assertArrayNotHasKey('options', $localeBag);
            }
        }

        // Template snapshot rewritten the same way.
        $template = DB::table('form_templates')->where('id', $templateId)->first();
        $tplSnap = json_decode((string) $template->schema_snapshot, true);
        // RFC-WS-6 session 2.7: snapshot rewritten by migration; compare
        // on canonical form to be engine-agnostic.
        $this->assertSame(
            JsonCanonicalizer::encode([
                ['value' => 'A', 'label' => 'A', 'sort_order' => 0],
                ['value' => 'B', 'label' => 'B', 'sort_order' => 1],
            ]),
            JsonCanonicalizer::encode($tplSnap['fields'][0]['options']),
        );
    }

    public function test_rollback_reconstructs_json_columns_and_snapshots(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        [$selectId, $multiId, $libraryId] = $this->seedFieldsAndLibraryWithJson();
        $submissionId = $this->seedSubmissionWithSnapshot($selectId);

        $this->artisan('migrate')->assertSuccessful();
        $this->assertSame(
            7,
            DB::table('form_field_options')->count(),
            '3 + 2 + 2 owner rows',
        );

        // Step back over only the backfill migration → JSON columns repopulate
        // and snapshots revert to flat-string-array shape.
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->assertSame(0, DB::table('form_field_options')->count());

        $select = DB::table('form_fields')->where('id', $selectId)->first();
        $this->assertSame(['XS', 'S', 'M'], json_decode((string) $select->options, true));
        $bag = json_decode((string) $select->translations, true);
        $this->assertSame(['Größe XS', 'Klein', 'Mittel'], $bag['de']['options']);

        $library = DB::table('form_field_library')->where('id', $libraryId)->first();
        $this->assertSame(['lib_a', 'lib_b'], json_decode((string) $library->options, true));

        $submission = DB::table('form_submissions')->where('id', $submissionId)->first();
        $snapshot = json_decode((string) $submission->schema_snapshot, true);
        $this->assertSame(['XS', 'S', 'M'], $snapshot['fields'][0]['options']);
        $this->assertSame(['Größe XS', 'Klein', 'Mittel'], $snapshot['fields'][0]['translations']['de']['options']);
    }

    public function test_fails_when_options_present_on_non_option_field_type(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->seedFieldWithOptions('TAG_PICKER', ['Veiligheid', 'Horeca']);

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Stale options on form_fields.*type=TAG_PICKER/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_when_options_contains_non_string_entry(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();

        $this->seedFieldWithOptionsRaw('SELECT', json_encode([
            ['label' => 'A'],
            ['label' => 'B'],
        ]));

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Expected flat string array/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_when_options_is_object_shape(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();

        $this->seedFieldWithOptionsRaw('SELECT', json_encode([
            'XS' => 'Extra small',
            'S' => 'Small',
        ]));

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Expected flat string array/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_on_translations_length_mismatch(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->seedFieldWithOptionsRaw('SELECT', json_encode(['XS', 'S', 'M']), json_encode([
            'de' => ['options' => ['Klein', 'Mittel']], // 2 vs 3
        ]));

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Translations length mismatch/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_on_non_string_translation(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->seedFieldWithOptionsRaw('SELECT', json_encode(['XS', 'S']), json_encode([
            'de' => ['options' => ['Klein', 42]],
        ]));

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Invalid translated label/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_on_oversized_translation(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->seedFieldWithOptionsRaw('SELECT', json_encode(['XS']), json_encode([
            'de' => ['options' => [str_repeat('x', 256)]],
        ]));

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Invalid translated label/');
        $this->artisan('migrate')->assertSuccessful();
    }

    public function test_fails_when_snapshot_options_present_on_non_option_field_type(): void
    {
        $this->artisan('migrate:rollback', ['--step' => 6])->assertSuccessful();
        $this->seedTemplateWithSnapshotRaw([
            'fields' => [[
                'id' => (string) Str::ulid(),
                'slug' => 'tags',
                'field_type' => 'TAG_PICKER',
                'label' => 'Tags',
                'options' => ['Veiligheid'],
            ]],
        ]);

        $this->expectException(\RuntimeException::class);
        $this->expectExceptionMessageMatches('/Snapshot.*field_type is TAG_PICKER/');
        $this->artisan('migrate')->assertSuccessful();
    }

    /** @return array{0:string,1:string,2:string} */
    private function seedFieldsAndLibraryWithJson(): array
    {
        $org = Organisation::factory()->create();
        $schema = FormSchema::factory()->create(['organisation_id' => $org->id]);

        $selectId = (string) Str::ulid();
        $multiId = (string) Str::ulid();

        DB::table('form_fields')->insert([
            'id' => $selectId,
            'form_schema_id' => $schema->id,
            'field_type' => 'SELECT',
            'slug' => 'shirtmaat',
            'label' => 'Shirtmaat',
            'options' => json_encode(['XS', 'S', 'M']),
            'translations' => json_encode([
                'de' => ['label' => 'Größe', 'options' => ['Größe XS', 'Klein', 'Mittel']],
                'en' => ['label' => 'Size'],
            ]),
            'value_storage_hint' => 'string',
            'sort_order' => 0,
            'created_at' => now(),
            'updated_at' => now(),
        ]);
        DB::table('form_fields')->insert([
            'id' => $multiId,
            'form_schema_id' => $schema->id,
            'field_type' => 'MULTISELECT',
            'slug' => 'dieet',
            'label' => 'Dieet',
            'options' => json_encode(['Vegan', 'Halal']),
            'translations' => null,
            'value_storage_hint' => 'json',
            'sort_order' => 1,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        $libraryId = (string) Str::ulid();
        DB::table('form_field_library')->insert([
            'id' => $libraryId,
            'organisation_id' => $org->id,
            'name' => 'Lib Select',
            'slug' => 'lib-select',
            'field_type' => 'SELECT',
            'label' => 'Library',
            'options' => json_encode(['lib_a', 'lib_b']),
            'default_is_required' => false,
            'default_is_filterable' => false,
            'usage_count' => 0,
            'is_system' => false,
            'is_active' => true,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        return [$selectId, $multiId, $libraryId];
    }

    private function seedSubmissionWithSnapshot(string $fieldId): string
    {
        $org = Organisation::factory()->create();
        $schema = FormSchema::factory()->create(['organisation_id' => $org->id]);

        $submissionId = (string) Str::ulid();
        DB::table('form_submissions')->insert([
            'id' => $submissionId,
            'organisation_id' => $org->id,
            'form_schema_id' => $schema->id,
            'subject_type' => 'person',
            'subject_id' => (string) Str::ulid(),
            'status' => 'submitted',
            'is_test' => false,
            'submitted_in_locale' => 'nl',
            'schema_snapshot' => json_encode([
                'fields' => [[
                    'id' => $fieldId,
                    'slug' => 'shirtmaat',
                    'field_type' => 'SELECT',
                    'label' => 'Shirtmaat',
                    'options' => ['XS', 'S', 'M'],
                    'translations' => [
                        'de' => ['label' => 'Größe', 'options' => ['Größe XS', 'Klein', 'Mittel']],
                    ],
                ]],
            ]),
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        return $submissionId;
    }

    private function seedTemplateWithSnapshot(): string
    {
        $org = Organisation::factory()->create();

        $templateId = (string) Str::ulid();
        DB::table('form_templates')->insert([
            'id' => $templateId,
            'organisation_id' => $org->id,
            'name' => 'Tpl',
            'slug' => 'tpl',
            'purpose' => 'event_registration',
            'description' => null,
            'schema_snapshot' => json_encode([
                'fields' => [[
                    'id' => (string) Str::ulid(),
                    'slug' => 'choice',
                    'field_type' => 'RADIO',
                    'label' => 'Choice',
                    'options' => ['A', 'B'],
                ]],
            ]),
            'is_active' => true,
            'is_system' => false,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        return $templateId;
    }

    private function seedFieldWithOptions(string $fieldType, array $options): string
    {
        return $this->seedFieldWithOptionsRaw($fieldType, json_encode($options));
    }

    private function seedFieldWithOptionsRaw(string $fieldType, string $optionsJson, ?string $translationsJson = null): string
    {
        $org = Organisation::factory()->create();
        $schema = FormSchema::factory()->create(['organisation_id' => $org->id]);

        $id = (string) Str::ulid();
        DB::table('form_fields')->insert([
            'id' => $id,
            'form_schema_id' => $schema->id,
            'field_type' => $fieldType,
            'slug' => 'fld-'.Str::lower(Str::random(4)),
            'label' => 'Test',
            'options' => $optionsJson,
            'translations' => $translationsJson,
            'value_storage_hint' => 'string',
            'sort_order' => 0,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        return $id;
    }

    private function seedTemplateWithSnapshotRaw(array $snapshot): string
    {
        $org = Organisation::factory()->create();
        $id = (string) Str::ulid();
        DB::table('form_templates')->insert([
            'id' => $id,
            'organisation_id' => $org->id,
            'name' => 'Tpl',
            'slug' => 'tpl-'.Str::lower(Str::random(4)),
            'purpose' => 'event_registration',
            'description' => null,
            'schema_snapshot' => json_encode($snapshot),
            'is_active' => true,
            'is_system' => false,
            'created_at' => now(),
            'updated_at' => now(),
        ]);

        return $id;
    }
}