<?php

namespace Tests\Feature\Prompts;

use App\Models\Prompt;
use App\Models\Tag;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Inertia\Testing\AssertableInertia as Assert;
use Tests\TestCase;

class PromptStoreUpdateTest extends TestCase
{
    use RefreshDatabase;

    /**
     * @return array<string, mixed>
     */
    private function validPayload(array $overrides = []): array
    {
        return array_merge([
            'name' => 'Code Reviewer',
            'description' => 'Review code written in {{language}}',
            'body' => 'Review this {{language}} snippet: {{snippet}}',
            'tags' => ['Coding', 'code review'],
        ], $overrides);
    }

    public function test_create_page_renders_empty_form_with_suggested_tags(): void
    {
        Tag::query()->create(['name' => 'writing']);

        $this->get('/prompts/create')
            ->assertOk()
            ->assertInertia(fn (Assert $page) => $page
                ->component('Prompts/Create')
                ->where('initial', ['name' => null, 'description' => null, 'body' => null, 'tags' => []])
                ->where('suggestedTags', ['writing']));
    }

    public function test_create_page_reflashes_old_input_after_failed_store(): void
    {
        $name = 'Too long '.str_repeat('n', 121);

        // The browser arrives from the create page, so the failed store
        // redirects back there with flashed old input.
        $this->post('/prompts', ['name' => $name, 'body' => 'b'], ['Referer' => '/prompts/create'])
            ->assertRedirect('/prompts/create')
            ->assertSessionHasErrors('name');

        $this->get('/prompts/create')
            ->assertInertia(fn (Assert $page) => $page
                ->component('Prompts/Create')
                ->where('initial.name', $name)
                ->where('initial.body', 'b'));
    }

    public function test_store_creates_prompt_with_normalized_tags(): void
    {
        $response = $this->post('/prompts', $this->validPayload([
            'tags' => [' Coding ', 'coding', '', '  '],
        ]));

        $prompt = Prompt::query()->sole();

        $response->assertRedirect(route('prompts.show', $prompt));
        $this->assertSame('Code Reviewer', $prompt->name);
        $this->assertSame('Review code written in {{language}}', $prompt->description);
        $this->assertSame('coding', $prompt->tags->first()->name);
        $this->assertSame(1, Tag::query()->count());
        $this->assertFalse($prompt->is_favorite);
        $this->assertSame(0, $prompt->usage_count);
    }

    public function test_store_without_tags_creates_prompt_without_tags(): void
    {
        $response = $this->post('/prompts', [
            'name' => 'Bare',
            'body' => 'Hello, world.',
        ]);

        $prompt = Prompt::query()->sole();

        $response->assertRedirect(route('prompts.show', $prompt));
        $this->assertCount(0, $prompt->tags);
        $this->assertNull($prompt->description);
    }

    public function test_store_reuses_existing_tags_and_dedupes_names(): void
    {
        Tag::query()->create(['name' => 'alpha']);

        $response = $this->post('/prompts', $this->validPayload(['tags' => ['ALPHA', 'alpha', 'beta']]));

        $prompt = Prompt::query()->sole();

        $response->assertRedirect();
        $this->assertSame(2, Tag::query()->count());
        $this->assertSame(['alpha', 'beta'], $prompt->tags->pluck('name')->all());
    }

    public function test_store_validates_payload(): void
    {
        $this->post('/prompts', ['description' => 'd', 'body' => 'b'])
            ->assertSessionHasErrors('name');

        $this->post('/prompts', $this->validPayload(['name' => str_repeat('n', 121)]))
            ->assertSessionHasErrors('name');

        $this->post('/prompts', $this->validPayload(['description' => str_repeat('d', 501)]))
            ->assertSessionHasErrors('description');

        $this->post('/prompts', ['name' => 'N'])
            ->assertSessionHasErrors('body');

        $this->post('/prompts', $this->validPayload(['tags' => 'nope']))
            ->assertSessionHasErrors('tags');

        $this->post('/prompts', $this->validPayload(['tags' => [123]]))
            ->assertSessionHasErrors('tags.0');

        $this->post('/prompts', $this->validPayload(['tags' => [str_repeat('t', 41)]]))
            ->assertSessionHasErrors('tags.0');

        $this->assertSame(0, Prompt::query()->count());
        $this->assertSame(0, Tag::query()->count());
    }

    public function test_update_changes_fields_and_resyncs_tags(): void
    {
        $old = Tag::query()->create(['name' => 'old']);
        $prompt = Prompt::factory()->create([
            'name' => 'Before',
            'description' => 'old description',
            'body' => 'old {{body}}',
        ]);
        $prompt->tags()->attach($old->id);

        $response = $this->put("/prompts/{$prompt->id}", $this->validPayload([
            'name' => 'After',
            'description' => 'new description',
            'body' => 'new body',
            'tags' => ['fresh'],
        ]));

        $prompt->refresh();

        $response->assertRedirect(route('prompts.show', $prompt));
        $this->assertSame('After', $prompt->name);
        $this->assertSame('new description', $prompt->description);
        $this->assertSame('new body', $prompt->body);
        $this->assertSame(['fresh'], $prompt->tags->pluck('name')->all());
        // The detached tag row survives; only the pivot is removed.
        $this->assertSame(2, Tag::query()->count());
    }

    public function test_update_without_tags_clears_existing_tags(): void
    {
        $tag = Tag::query()->create(['name' => 'old']);
        $prompt = Prompt::factory()->create(['name' => 'Before', 'body' => 'x']);
        $prompt->tags()->attach($tag->id);

        $response = $this->put("/prompts/{$prompt->id}", ['name' => 'After', 'body' => 'y']);

        $response->assertRedirect();
        $this->assertCount(0, $prompt->fresh()->tags);
    }

    public function test_update_validates_payload(): void
    {
        $prompt = Prompt::factory()->create();

        $this->put("/prompts/{$prompt->id}", ['body' => 'b'])->assertSessionHasErrors('name');
        $this->put("/prompts/{$prompt->id}", ['name' => 'N'])->assertSessionHasErrors('body');
        $this->put("/prompts/{$prompt->id}", ['name' => 'N', 'body' => 'B', 'tags' => null])
            ->assertSessionHasNoErrors();
    }
}