<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Carbon;

class Report extends Model
{
    /**
     * ID метрики для среднего койко-дня
     */
    const METRIC_BED_DAYS_ID = 18;

    protected $primaryKey = 'report_id';
    public $timestamps = false;

    protected $fillable = [
        'created_at',
        'sent_at',
        'rf_department_id',
        'rf_user_id',
        'rf_lpudoctor_id'
    ];

    public function metrikaResults(): \Illuminate\Database\Eloquent\Relations\HasMany
    {
        return $this->hasMany(MetrikaResult::class, 'rf_report_id', 'report_id');
    }

    public function observationPatients(): \Illuminate\Database\Eloquent\Relations\HasMany
    {
        return $this->hasMany(ObservationPatient::class, 'rf_report_id', 'report_id');
    }

    public function unwantedEvents()
    {
        return $this->hasMany(UnwantedEvent::class, 'rf_report_id', 'report_id');
    }

    public function user()
    {
        return $this->belongsTo(User::class, 'rf_user_id');
    }

    public function lpuDoctor()
    {
        return $this->belongsTo(MisLpuDoctor::class, 'rf_lpudoctor_id');
    }

    /**
     * Связь со снапшотами
     */
    public function snapshots()
    {
        return $this->hasMany(MedicalHistorySnapshot::class, 'rf_report_id', 'report_id');
    }

    /**
     * Получить выписанных пациентов из снапшотов
     */
    public function getDischargedPatientsOnSnapshots()
    {
        return $this->snapshots()
            ->where('patient_type', MedicalHistorySnapshot::PATIENT_TYPE_DISCHARGED)
            ->distinct()
            ->with('medicalHistory')
            ->get();
    }

    /**
     * Получить текущих пациентов из снапшотов
     */
    public function getCurrentPatientsOnSnapshots()
    {
        return $this->snapshots()
            ->where('patient_type', MedicalHistorySnapshot::PATIENT_TYPE_CURRENT)
            ->with('medicalHistory')
            ->get();
    }

    /**
     * Рассчитать и сохранить средний койко-день на основе снапшотов
     */
    public function calculateAndSaveAverageBedDays()
    {
        $dischargedPatients = $this->getDischargedPatientsOnSnapshots();

        if ($dischargedPatients->isEmpty()) {
            $avgBedDays = 0;
        } else {
            $totalDays = 0;
            foreach ($dischargedPatients as $snapshot) {
                $history = $snapshot->medicalHistory;
                if ($history && $history->DateRecipient && $history->DateExtract) {
                    $start = Carbon::parse($history->DateRecipient);
                    $end = Carbon::parse($history->DateExtract);
                    $days = $start->diffInDays($end);
                    $totalDays += $days;
                }
            }
            $avgBedDays = round($totalDays / $dischargedPatients->count(), 1);
        }

        // Сохраняем результат как метрику
        MetrikaResult::updateOrCreate([
                'rf_report_id' => $this->report_id,
                'rf_metrika_item_id' => self::METRIC_BED_DAYS_ID,
            ],
            [
                'value' => $avgBedDays,
            ]);

        return $avgBedDays;
    }
}