<?php

namespace Tests\Feature;

use App\Enums\ChatSessionStatus;
use App\Models\User;
use App\Services\ChatService;
use Illuminate\Support\Carbon;
use Illuminate\Foundation\Testing\RefreshDatabase;
use PHPOpenSourceSaver\JWTAuth\Facades\JWTAuth;
use Tests\TestCase;

class ChatSessionTest extends TestCase
{
    use RefreshDatabase;

    private function authHeader(User $user): array
    {
        return ['Authorization' => 'Bearer '.JWTAuth::fromUser($user)];
    }

    public function test_append_messages_sequential_seq_and_last_seq(): void
    {
        $service = app(ChatService::class);
        $session = $service->createSession('Test Session');

        $messages = collect(range(1, 20))->map(function ($i) use ($service, $session) {
            return $service->appendMessage([
                'session_id' => $session->session_id,
                'role' => 'USER',
                'type' => 'user.prompt',
                'content' => 'msg '.$i,
            ]);
        });

        $seqs = $messages->pluck('seq')->all();
        $this->assertEquals(range(1, 20), $seqs);

        $session->refresh();
        $this->assertEquals(20, $session->last_seq);
    }

    public function test_dedupe_returns_existing_message(): void
    {
        $service = app(ChatService::class);
        $session = $service->createSession('Test Session');

        $first = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'hello',
            'dedupe_key' => 'k1',
        ]);

        $second = $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'hello again',
            'dedupe_key' => 'k1',
        ]);

        $this->assertEquals($first->message_id, $second->message_id);
        $this->assertEquals($first->seq, $second->seq);
        $this->assertCount(1, $session->messages()->get());
    }

    public function test_closed_session_blocks_append_except_whitelisted(): void
    {
        $service = app(ChatService::class);
        $session = $service->createSession('Test Session');
        $session->update(['status' => ChatSessionStatus::CLOSED]);

        $this->expectExceptionMessage('Session is closed');
        $service->appendMessage([
            'session_id' => $session->session_id,
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'blocked',
        ]);
    }

    public function test_http_append_and_list_messages(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);

        $createSession = $this->withHeaders($headers)->postJson('/api/sessions', [
            'session_name' => 'API Session',
        ])->assertCreated();

        $sessionId = $createSession->json('data.session_id');

        $append = $this->withHeaders($headers)->postJson("/api/sessions/{$sessionId}/messages", [
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'hello api',
        ])->assertCreated();

        $this->assertEquals(1, $append->json('data.seq'));

        $list = $this->withHeaders($headers)->getJson("/api/sessions/{$sessionId}/messages?after_seq=0&limit=10")
            ->assertOk();

        $this->assertEquals(1, $list->json('data.0.seq'));
        $this->assertEquals('hello api', $list->json('data.0.content'));
    }

    public function test_session_list_sorted_and_last_message_preview(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);

        Carbon::setTestNow('2025-01-01 00:00:00');
        $s1 = $service->createSession('First');
        $service->appendMessage([
            'session_id' => $s1->session_id,
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'hello first',
        ]);

        Carbon::setTestNow('2025-01-01 00:00:10');
        $s2 = $service->createSession('Second');
        $service->appendMessage([
            'session_id' => $s2->session_id,
            'role' => 'USER',
            'type' => 'user.prompt',
            'content' => 'hello second',
        ]);

        Carbon::setTestNow();

        $resp = $this->withHeaders($headers)->getJson('/api/sessions?per_page=10')
            ->assertOk();

        $this->assertEquals($s2->session_id, $resp->json('data.0.session_id'));
        $this->assertEquals('hello second', $resp->json('data.0.last_message_preview'));
        $this->assertEquals('hello first', $resp->json('data.1.last_message_preview'));
        $this->assertNotNull($resp->json('data.0.last_message_at'));
    }

    public function test_session_list_filters_status_and_query(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);

        $open = $service->createSession('Alpha');
        $locked = $service->createSession('Beta');
        $locked->update(['status' => ChatSessionStatus::LOCKED]);
        $closed = $service->createSession('Gamma');
        $closed->update(['status' => ChatSessionStatus::CLOSED]);

        $respStatus = $this->withHeaders($headers)->getJson('/api/sessions?status=LOCKED')
            ->assertOk();
        $this->assertCount(1, $respStatus->json('data'));
        $this->assertEquals($locked->session_id, $respStatus->json('data.0.session_id'));

        $respQuery = $this->withHeaders($headers)->getJson('/api/sessions?q=Alpha')
            ->assertOk();
        $this->assertCount(1, $respQuery->json('data'));
        $this->assertEquals($open->session_id, $respQuery->json('data.0.session_id'));
    }

    public function test_patch_updates_session_name(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);
        $session = $service->createSession('Old Name');

        $resp = $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
            'session_name' => 'New Name',
        ])->assertOk();

        $this->assertEquals('New Name', $resp->json('data.session_name'));
    }

    public function test_patch_updates_status_transitions(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);
        $session = $service->createSession('Status Session');

        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
            'status' => ChatSessionStatus::LOCKED,
        ])->assertOk()->assertJsonFragment(['status' => ChatSessionStatus::LOCKED]);

        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
            'status' => ChatSessionStatus::OPEN,
        ])->assertOk()->assertJsonFragment(['status' => ChatSessionStatus::OPEN]);
    }

    public function test_closed_session_cannot_reopen(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);
        $session = $service->createSession('Closed Session');
        $session->update(['status' => ChatSessionStatus::CLOSED]);

        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [
            'status' => ChatSessionStatus::OPEN,
        ])->assertStatus(403);
    }

    public function test_empty_patch_rejected(): void
    {
        $user = User::factory()->create();
        $headers = $this->authHeader($user);
        $service = app(ChatService::class);
        $session = $service->createSession('Patch Empty');

        $this->withHeaders($headers)->patchJson("/api/sessions/{$session->session_id}", [])
            ->assertStatus(422);
    }
}