<?php

namespace App\Services;

use App\Models\Machine;
use App\Models\PricingRule;
use App\Models\Promotion;
use Carbon\Carbon;
use Carbon\CarbonInterface;

class PricingService
{
    public function getActivePrice(Machine $machine, ?CarbonInterface $at = null): float
    {
        $at = Carbon::instance($at ?? now());
        $establishment = $machine->establishment;

        if ($establishment === null) {
            $machine->loadMissing('establishment');
            $establishment = $machine->establishment;
        }

        if ($establishment === null) {
            throw new \RuntimeException('Établissement introuvable pour la machine.');
        }

        $dayType = $this->resolveDayType($at);
        $time = $at->format('H:i:s');

        $rules = PricingRule::query()
            ->where('establishment_id', $establishment->id)
            ->where('is_active', true)
            ->where(function ($query) use ($machine) {
                $query->whereNull('machine_id')
                    ->orWhere('machine_id', $machine->id);
            })
            ->where(function ($query) use ($machine) {
                $query->whereNull('machine_type')
                    ->orWhere('machine_type', $machine->type);
            })
            ->where(function ($query) use ($dayType) {
                $query->where('day_type', 'all')
                    ->orWhere('day_type', $dayType);
            })
            ->where('slot_start', '<=', $time)
            ->where('slot_end', '>', $time)
            ->orderBy('priority')
            ->orderByRaw('CASE WHEN machine_id IS NOT NULL THEN 0 WHEN machine_type IS NOT NULL THEN 1 ELSE 2 END')
            ->get();

        $rule = $rules->first();

        if ($rule === null) {
            throw new \RuntimeException('Aucune règle tarifaire active pour cette machine.');
        }

        $basePrice = (float) $rule->price;

        return $this->applyPromotion($establishment->id, $machine->type, $at, $basePrice);
    }

    private function resolveDayType(CarbonInterface $at): string
    {
        if ($at->isWeekend()) {
            return 'weekend';
        }

        return 'weekday';
    }

    private function applyPromotion(int $establishmentId, string $machineType, CarbonInterface $at, float $basePrice): float
    {
        $promotion = Promotion::query()
            ->where('establishment_id', $establishmentId)
            ->where('is_active', true)
            ->where('starts_at', '<=', $at)
            ->where('ends_at', '>=', $at)
            ->where(function ($query) use ($machineType) {
                $query->where('machine_type', 'all')
                    ->orWhere('machine_type', $machineType);
            })
            ->orderByDesc('discount_value')
            ->first();

        if ($promotion === null) {
            return round($basePrice, 2);
        }

        $discount = $promotion->discount_type === 'percent'
            ? $basePrice * ((float) $promotion->discount_value / 100)
            : (float) $promotion->discount_value;

        return round(max(0, $basePrice - $discount), 2);
    }
}