<?php

declare(strict_types=1);

use App\Models\Project;
use App\Models\SupplierProject;
use App\Models\Tenant;
use App\Services\LeadRouter;
use Illuminate\Foundation\Testing\DatabaseTransactions;
use Illuminate\Support\Facades\DB;
use Random\Engine\Mt19937;
use Random\Randomizer;
use Tests\Concerns\SharesSupplierPdo;

uses(DatabaseTransactions::class);
uses(SharesSupplierPdo::class);

beforeEach(function (): void {
    DB::statement("SELECT set_config('app.current_tenant_id', '0', true)");
});

/** Детерминированный роутер с засеянным жребием (вариант В). */
function seededRouter(int $seed = 42): LeadRouter
{
    return new LeadRouter(new Randomizer(new Mt19937($seed)));
}

/**
 * Создаёт tenant + project + pivot/snapshot для каскад-тестов.
 * regions — PG-массив-литерал ('{82}' / '{}'); remaining лимита = dailyLimit - deliveredToday.
 */
function makeCascadeProject(
    SupplierProject $sp,
    string $regions,
    int $dailyLimit = 100,
    int $deliveredToday = 0,
): Project {
    $tenant = Tenant::factory()->create(['balance_leads' => 100, 'balance_rub' => '1000.00']);
    $project = Project::factory()->create([
        'tenant_id' => $tenant->id,
        'is_active' => true,
        'daily_limit_target' => $dailyLimit,
        'delivered_today' => $deliveredToday,
        'delivery_days_mask' => 127,
        'signal_type' => $sp->signal_type,
        'signal_identifier' => $sp->unique_key,
    ]);
    linkProjectToSupplier($project, $sp);
    createRoutingSnapshotFromProject(
        $project,
        signalType: $sp->signal_type,
        signalIdentifier: $sp->unique_key,
        dailyLimit: $dailyLimit,
        regions: $regions,
    );

    return $project;
}

function b1Supplier(string $key = 'ex.ru'): SupplierProject
{
    return SupplierProject::query()->create([
        'platform' => 'B1', 'signal_type' => 'site', 'unique_key' => $key,
        'subject_code' => 82, 'current_limit' => 0, 'sync_status' => 'ok',
    ]);
}

it('step 1: exact region match wins, others excluded', function (): void {
    $sp = b1Supplier();
    $spb = makeCascadeProject($sp, regions: '{83}'); // Питер
    $msk = makeCascadeProject($sp, regions: '{82}'); // Москва

    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: 82);

    expect($matched->pluck('id')->all())->toBe([$msk->id])
        ->and($matched->first()->routing_step)->toBe(1);
});

it('step 2: falls to all-RF when no exact match', function (): void {
    $sp = b1Supplier('s2.ru');
    $allRu = makeCascadeProject($sp, regions: '{}'); // вся РФ

    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: 82);

    expect($matched->pluck('id')->all())->toBe([$allRu->id])
        ->and($matched->first()->routing_step)->toBe(2);
});

it('step 3: fallback channel when nobody subscribed to region and no all-RF', function (): void {
    $sp = b1Supplier('s3.ru');
    $spb = makeCascadeProject($sp, regions: '{83}'); // только Питер подписан

    // resolvedSubjectCode=82 (Москва): точных нет, «вся РФ» нет → запасной канал.
    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: 82);

    expect($matched->pluck('id')->all())->toBe([$spb->id])
        ->and($matched->first()->routing_step)->toBe(3);
});

it('exact + all-RF combine up to cap=3, exact taking priority', function (): void {
    $sp = b1Supplier('s4.ru');
    $e1 = makeCascadeProject($sp, regions: '{82}');
    $e2 = makeCascadeProject($sp, regions: '{82}');
    $r1 = makeCascadeProject($sp, regions: '{}');
    $r2 = makeCascadeProject($sp, regions: '{}');

    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: 82);

    // Всего 3 (cap). Оба точных (step 1) обязаны быть; добор — ровно 1 «вся РФ» (step 2).
    expect($matched)->toHaveCount(3);
    $byStep = $matched->groupBy(fn ($p) => $p->routing_step);
    expect($byStep->get(1)->pluck('id')->sort()->values()->all())->toBe(collect([$e1->id, $e2->id])->sort()->values()->all())
        ->and($byStep->get(2))->toHaveCount(1);
    expect(in_array($byStep->get(2)->first()->id, [$r1->id, $r2->id], true))->toBeTrue();
});

it('null resolvedSubjectCode skips exact, uses all-RF', function (): void {
    $sp = b1Supplier('s5.ru');
    $allRu = makeCascadeProject($sp, regions: '{}');
    $exact = makeCascadeProject($sp, regions: '{82}');

    // Резолвер не сработал → шаг 1 пропускается; матчит только «вся РФ».
    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: null);

    expect($matched->pluck('id')->all())->toBe([$allRu->id])
        ->and($matched->first()->routing_step)->toBe(2);
});

it('cascade works for DIRECT supplier_project path too', function (): void {
    $sp = SupplierProject::query()->create([
        'platform' => 'DIRECT', 'signal_type' => 'site', 'unique_key' => 'cashmotor.ru',
        'subject_code' => 82, 'current_limit' => 0, 'sync_status' => 'ok',
    ]);
    $msk = makeCascadeProject($sp, regions: '{82}');
    $spb = makeCascadeProject($sp, regions: '{83}');

    $matched = seededRouter()->matchEligibleProjects($sp, resolvedSubjectCode: 82);

    expect($matched->pluck('id')->all())->toBe([$msk->id])
        ->and($matched->first()->routing_step)->toBe(1);
});

it('backward compat: no second arg behaves as all-RF/any (existing call shape)', function (): void {
    $sp = b1Supplier('s7.ru');
    $allRu = makeCascadeProject($sp, regions: '{}');

    // Старая сигнатура (без 2-го аргумента) — дефолт null → шаг 2 all-RF матчит '{}'.
    $matched = seededRouter()->matchEligibleProjects($sp);

    expect($matched->pluck('id')->all())->toBe([$allRu->id]);
});

it('variant В: weighted pick — small client never starved, big client wins more often', function (): void {
    $sp = b1Supplier('fair.ru');
    // 5 клиентов на Москву, разный остаток лимита.
    $a = makeCascadeProject($sp, regions: '{82}', dailyLimit: 100); // остаток 100
    $b = makeCascadeProject($sp, regions: '{82}', dailyLimit: 50);
    $c = makeCascadeProject($sp, regions: '{82}', dailyLimit: 30);
    $d = makeCascadeProject($sp, regions: '{82}', dailyLimit: 20);
    $e = makeCascadeProject($sp, regions: '{82}', dailyLimit: 10);  // остаток 10 — самый маленький

    $wins = [];
    $seedCount = 120;
    for ($seed = 0; $seed < $seedCount; $seed++) {
        $matched = seededRouter($seed)->matchEligibleProjects($sp, resolvedSubjectCode: 82);
        expect($matched)->toHaveCount(3); // лид всегда раздаётся ровно троим
        foreach ($matched as $p) {
            $wins[$p->id] = ($wins[$p->id] ?? 0) + 1;
        }
    }

    // (1) Мелкого не отрезаем: за 120 розыгрышей хотя бы раз получил лид.
    expect($wins[$e->id] ?? 0)->toBeGreaterThan(0);
    // (2) Вес уважается: крупный клиент выигрывает строго чаще мелкого.
    expect($wins[$a->id] ?? 0)->toBeGreaterThan($wins[$e->id] ?? 0);
});

it('variant В: deterministic — same seed yields same recipients', function (): void {
    $sp = b1Supplier('det.ru');
    makeCascadeProject($sp, regions: '{82}', dailyLimit: 100);
    makeCascadeProject($sp, regions: '{82}', dailyLimit: 50);
    makeCascadeProject($sp, regions: '{82}', dailyLimit: 30);
    makeCascadeProject($sp, regions: '{82}', dailyLimit: 20);

    $first = seededRouter(7)->matchEligibleProjects($sp, resolvedSubjectCode: 82)->pluck('id')->all();
    $second = seededRouter(7)->matchEligibleProjects($sp, resolvedSubjectCode: 82)->pluck('id')->all();

    expect($first)->toBe($second)->and($first)->toHaveCount(3);
});