<?php

declare(strict_types=1);

namespace Tests\Unit\FormBuilder\Bindings;

use App\Enums\FormBuilder\BindingTargetType;
use App\Enums\FormBuilder\FormFieldBindingMergeStrategy;
use App\FormBuilder\Bindings\BindingConflictResolver;
use App\FormBuilder\Bindings\ResolvedBinding;
use App\Models\FormBuilder\FormField;
use App\Models\FormBuilder\FormSchema;
use App\Models\FormBuilder\FormSubmission;
use App\Models\FormBuilder\FormValue;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Tests\TestCase;

final class BindingConflictResolverTest extends TestCase
{
    use RefreshDatabase;

    public function test_single_binding_wins_trivially(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('email', 'person', 'email', trustLevel: 80, value: 'a@example.nl'),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(1, $resolved);
        $this->assertSame('a@example.nl', $resolved[0]->value);
        $this->assertSame('person', $resolved[0]->targetEntity);
        $this->assertSame(BindingTargetType::SCALAR, $resolved[0]->targetType);
    }

    public function test_higher_trust_wins(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('email_low', 'person', 'email', trustLevel: 30, value: 'low@example.nl'),
            $this->fieldRow('email_high', 'person', 'email', trustLevel: 90, value: 'high@example.nl'),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(1, $resolved);
        $this->assertSame('high@example.nl', $resolved[0]->value);
    }

    public function test_equal_trust_breaks_by_sort_order(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('first_email', 'person', 'email', trustLevel: 50, value: 'first@example.nl', sortOrder: 1),
            $this->fieldRow('second_email', 'person', 'email', trustLevel: 50, value: 'second@example.nl', sortOrder: 0),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(1, $resolved);
        // sort_order 0 wins over sort_order 1 at equal trust
        $this->assertSame('second@example.nl', $resolved[0]->value);
    }

    public function test_field_absent_from_form_values_is_not_a_candidate(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('email_skipped', 'person', 'email', trustLevel: 90, writeValue: false),
            $this->fieldRow('first_name', 'person', 'first_name', trustLevel: 50, value: 'Jan'),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(1, $resolved);
        $this->assertSame('person.first_name', $resolved[0]->targetEntity . '.' . $resolved[0]->targetAttribute);
    }

    public function test_explicit_null_value_is_a_candidate(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('email', 'person', 'email', trustLevel: 80, value: ''),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(1, $resolved);
        $this->assertTrue($resolved[0]->valueIsExplicit);
    }

    public function test_section_filter_includes_only_matching_section(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('a_email', 'person', 'email', trustLevel: 80, value: 'a@example.nl', sectionSlug: 'section-a'),
            $this->fieldRow('b_first_name', 'person', 'first_name', trustLevel: 80, value: 'Jan', sectionSlug: 'section-b'),
        ]);
        $submission->schema_snapshot = array_merge($submission->schema_snapshot, [
            'sections' => [
                ['id' => 'sec-a-id', 'slug' => 'section-a'],
                ['id' => 'sec-b-id', 'slug' => 'section-b'],
            ],
        ]);
        $submission->save();

        $resolved = $this->resolver()->resolve($submission, sectionId: 'sec-a-id');
        $this->assertCount(1, $resolved);
        $this->assertSame('person.email', $resolved[0]->targetEntity . '.' . $resolved[0]->targetAttribute);
    }

    public function test_null_section_id_returns_all_candidates(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('a_email', 'person', 'email', trustLevel: 80, value: 'a@example.nl', sectionSlug: 'section-a'),
            $this->fieldRow('b_first_name', 'person', 'first_name', trustLevel: 80, value: 'Jan', sectionSlug: 'section-b'),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(2, $resolved);
    }

    public function test_different_target_groups_resolved_independently(): void
    {
        $submission = $this->makeSubmission([
            $this->fieldRow('email', 'person', 'email', trustLevel: 80, value: 'a@example.nl'),
            $this->fieldRow('first_name', 'person', 'first_name', trustLevel: 70, value: 'Jan'),
            $this->fieldRow('last_name', 'person', 'last_name', trustLevel: 60, value: 'Jansen'),
        ]);

        $resolved = $this->resolver()->resolve($submission);
        $this->assertCount(3, $resolved);
        $attributes = array_map(fn (ResolvedBinding $r): string => $r->targetAttribute, $resolved);
        $this->assertContains('email', $attributes);
        $this->assertContains('first_name', $attributes);
        $this->assertContains('last_name', $attributes);
    }

    public function test_empty_form_values_returns_empty(): void
    {
        $submission = $this->makeSubmission([]);
        $this->assertSame([], $this->resolver()->resolve($submission));
    }

    private function resolver(): BindingConflictResolver
    {
        return $this->app->make(BindingConflictResolver::class);
    }

    /**
     * @param  list<array<string, mixed>>  $fieldRows
     */
    private function makeSubmission(array $fieldRows): FormSubmission
    {
        $schema = FormSchema::factory()->create();
        $submission = FormSubmission::factory()->create([
            'form_schema_id' => $schema->id,
            'organisation_id' => $schema->organisation_id,
        ]);

        $snapshotFields = [];
        foreach ($fieldRows as $row) {
            $field = FormField::factory()->create([
                'form_schema_id' => $schema->id,
                'slug' => $row['slug'],
                'sort_order' => $row['sort_order'],
            ]);

            $snapshotFields[] = [
                'id' => (string) $field->id,
                'slug' => (string) $row['slug'],
                'sort_order' => (int) $row['sort_order'],
                'section_slug' => $row['section_slug'] ?? null,
                'bindings' => [[
                    'id' => 'bnd-' . $row['slug'],
                    'mode' => 'entity_owned',
                    'entity' => $row['entity'],
                    'column' => $row['column'],
                    'merge_strategy' => FormFieldBindingMergeStrategy::Overwrite->value,
                    'trust_level' => $row['trust_level'],
                    'is_identity_key' => false,
                ]],
            ];

            if ($row['write_value'] ?? true) {
                $val = new FormValue();
                $val->form_submission_id = $submission->id;
                $val->form_field_id = $field->id;
                $val->setAttribute('value', $row['value']);
                $val->value_anonymised = false;
                $val->save();
            }
        }

        $submission->schema_snapshot = ['fields' => $snapshotFields];
        $submission->save();

        return $submission->fresh();
    }

    /**
     * @return array<string, mixed>
     */
    private function fieldRow(
        string $slug,
        string $entity,
        string $column,
        int $trustLevel,
        mixed $value = null,
        int $sortOrder = 0,
        bool $writeValue = true,
        ?string $sectionSlug = null,
    ): array {
        return [
            'slug' => $slug,
            'entity' => $entity,
            'column' => $column,
            'trust_level' => $trustLevel,
            'value' => $value ?? '',
            'sort_order' => $sortOrder,
            'write_value' => $writeValue,
            'section_slug' => $sectionSlug,
        ];
    }
}