<?php

namespace Tests\Feature;

use App\Models\Central\Company;
use App\Models\Central\Plan;
use App\Models\Tenant\AiChat;
use App\Models\Tenant\AiMessage;
use App\Models\Tenant\Client;
use App\Models\Tenant\Part;
use App\Models\Tenant\User;
use App\Services\Ai\AiAssistantService;
use App\Services\Ai\AiToolExecutor;
use App\Tenancy\TenantManager;
use Illuminate\Foundation\Testing\RefreshDatabase;
use Illuminate\Support\Facades\Http;
use Tests\TestCase;

class AiToolUseTest extends TestCase
{
    use RefreshDatabase;

    public function test_tool_use_round_executes_tool_then_returns_final_text(): void
    {
        $ctx = $this->makeCtx();
        // Seed a part that the AI will "find" via the tool.
        Part::create([
            'name' => 'Filtru ulei MANN', 'article' => 'W811/80', 'brand' => 'MANN',
            'category' => 'Filtre', 'qty' => 5, 'min_qty' => 2, 'unit' => 'buc',
            'sell_price' => 75, 'buy_price' => 50, 'is_active' => true,
        ]);

        // First API response: Claude requests the tool.
        // Second: Claude returns the final answer.
        Http::fakeSequence('api.anthropic.com/*')
            ->push([
                'content' => [
                    ['type' => 'text', 'text' => 'Caut piesa…'],
                    ['type' => 'tool_use', 'id' => 'toolu_1', 'name' => 'find_parts', 'input' => ['query' => 'MANN']],
                ],
                'stop_reason' => 'tool_use',
                'usage' => ['input_tokens' => 100, 'output_tokens' => 20],
                'model' => 'claude-sonnet-4-5',
            ])
            ->push([
                'content' => [['type' => 'text', 'text' => 'Am găsit Filtru ulei MANN, stoc 5 buc la 75 MDL.']],
                'stop_reason' => 'end_turn',
                'usage' => ['input_tokens' => 120, 'output_tokens' => 35],
                'model' => 'claude-sonnet-4-5',
            ]);

        $chat = AiChat::create([
            'user_id' => $ctx['user']->id, 'provider' => 'claude',
        ]);

        $reply = app(AiAssistantService::class)->ask($chat, 'Ai filtru de ulei MANN?');

        $this->assertEquals('assistant', $reply->role);
        $this->assertStringContainsString('MANN', $reply->content);
        $this->assertStringContainsString('75', $reply->content);
        $this->assertEquals('find_parts', $reply->meta['tools'][0]['name']);
        $this->assertEquals(220, $reply->meta['tokens_in']);   // 100 + 120 cumulated
        $this->assertEquals(55, $reply->meta['tokens_out']);

        // Verify both API rounds happened with tools defined.
        $rounds = 0;
        Http::assertSent(function ($req) use (&$rounds) {
            if (! str_contains($req->url(), 'api.anthropic.com')) return false;
            $body = json_decode($req->body(), true);
            $this->assertArrayHasKey('tools', $body);
            $this->assertCount(5, $body['tools']);
            $rounds++;
            return true;
        });
        $this->assertEquals(2, $rounds);
    }

    public function test_executor_finds_parts_by_brand(): void
    {
        $this->makeCtx();
        Part::create(['name' => 'X', 'brand' => 'MANN', 'qty' => 1, 'unit' => 'buc',
            'sell_price' => 10, 'buy_price' => 5, 'is_active' => true]);
        Part::create(['name' => 'Y', 'brand' => 'Bosch', 'qty' => 1, 'unit' => 'buc',
            'sell_price' => 10, 'buy_price' => 5, 'is_active' => true]);

        $r = app(AiToolExecutor::class)->execute('find_parts', ['query' => 'MANN']);
        $this->assertEquals(1, $r['count']);
        $this->assertEquals('X', $r['rows'][0]['name']);
    }

    public function test_executor_unknown_tool_returns_error(): void
    {
        $this->makeCtx();
        $r = app(AiToolExecutor::class)->execute('does_not_exist', []);
        $this->assertArrayHasKey('error', $r);
    }

    private function makeCtx(): array
    {
        $plan = Plan::firstOrCreate(['slug' => 'test'], ['name' => 'T', 'price' => 0, 'features' => []]);
        $company = Company::create([
            'plan_id' => $plan->id, 'slug' => 'tool-' . uniqid(),
            'name' => 'Tool Co', 'city' => 'Chișinău', 'status' => 'active',
            'settings' => ['ai' => ['default_provider' => 'claude', 'claude_key' => 'sk-fake']],
        ]);
        app(TenantManager::class)->setCurrent($company);

        $user = User::create([
            'company_id' => $company->id, 'name' => 'Op', 'email' => 'op-' . uniqid() . '@example.com',
            'password' => bcrypt('x'), 'role' => 'admin', 'status' => 'active',
        ]);
        $this->actingAs($user);

        return compact('company', 'user');
    }
}