<?php

namespace App\Services\Document;

use App\Enums\DocumentStatusEnum;
use App\Enums\InvoiceStatusEnum;
use App\Enums\MediaCollectionEnum;
use App\Enums\ReportStatusEnum;
use App\Enums\UserEnum;
use App\Enums\WalletTransactionReasonEnum;
use App\Models\Document;
use App\Models\Medium;
use App\Models\Report;
use App\Models\User;
use App\Services\FileStorageService;
use App\Services\Shift\ShiftScheduleService;
use App\Services\Sms\SmsNotificationService;
use App\Services\Wallet\WalletService;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\ValidationException;

class CaseService
{
    protected FileStorageService $fileStorageService;

    protected WalletService $walletService;

    protected ShiftScheduleService $shiftScheduleService;

    protected SmsNotificationService $smsNotificationService;

    public function __construct(FileStorageService $fileStorageService, WalletService $walletService, ShiftScheduleService $shiftScheduleService, SmsNotificationService $smsNotificationService)
    {
        $this->fileStorageService = $fileStorageService;
        $this->walletService = $walletService;
        $this->shiftScheduleService = $shiftScheduleService;
        $this->smsNotificationService = $smsNotificationService;
    }

    public function pendingForUser(User $user): Builder
    {
        $statuses = $this->isDoctor($user)
            ? [DocumentStatusEnum::InProgress->value]
            : [DocumentStatusEnum::Registered->value, DocumentStatusEnum::InProgress->value];

        return Document::with(['pet', 'requester'])
            ->whereIn('status', $statuses)
            ->where(fn ($query) => $this->scopeVisibleTo($query, $user))
            ->latest('submitted_at');
    }

    public function canAccess(Document $document, User $user): bool
    {
        return $document->requester_id === $user->id
            || $document->assignments()->where('user_id', $user->id)->exists();
    }

    public function canAccessMedium(Medium $medium, User $user): bool
    {
        $documents = $medium->documents()->get()
            ->merge($medium->reports()->with('document')->get()->pluck('document'));

        return $documents->contains(fn ($document) => $this->canAccess($document, $user));
    }

    public function canReport(Document $document, User $user): bool
    {
        return $this->isDoctor($user)
            && $document->status === DocumentStatusEnum::InProgress
            && $document->assignments()->where('user_id', $user->id)->exists();
    }

    public function submitReport(Document $document, User $doctor, array $data, array $files = []): Report
    {
        return DB::transaction(function () use ($document, $doctor, $data, $files) {
            if (!$this->canReport($document, $doctor)) {
                throw ValidationException::withMessages(['document' => 'امکان ثبت گزارش برای این پرونده وجود ندارد.']);
            }

            $report = $document->reports()->create([
                'doctor_id' => $doctor->id,
                'status' => ReportStatusEnum::Approved->value,
                'technique' => $data['technique'] ?? null,
                'finding' => $data['finding'] ?? null,
                'diagnose' => $data['diagnose'] ?? null,
                'recommendation' => $data['recommendation'] ?? null,
                'submitted_at' => now(),
            ]);

            foreach ($files as $file) {
                $medium = $this->fileStorageService->storeFile($file);
                $report->media()->attach($medium->id, ['collection' => MediaCollectionEnum::Attachments->value]);
            }

            $document->update([
                'status' => DocumentStatusEnum::Completed->value,
                'finalized_at' => now(),
                'finalized_by' => $doctor->id,
            ]);

            $this->smsNotificationService->reportReady($document);

            return $report;
        });
    }

    public function reject(Document $document, User $doctor, string $reason): Document
    {
        return DB::transaction(function () use ($document, $doctor, $reason) {
            if (!$this->canReport($document, $doctor)) {
                throw ValidationException::withMessages(['document' => 'امکان رد این پرونده وجود ندارد.']);
            }

            $document->update([
                'status' => DocumentStatusEnum::Rejected->value,
                'finalized_at' => now(),
                'finalized_by' => $doctor->id,
                'rejection_reason' => $reason,
            ]);

            $invoice = $document->invoice;

            if ($invoice && $invoice->status === InvoiceStatusEnum::Paid) {
                $invoice->update(['status' => InvoiceStatusEnum::Canceled->value]);
                $this->walletService->deposit($document->requester, $invoice->amount, WalletTransactionReasonEnum::Refund);
            }

            return $document;
        });
    }

    public function statsForUser(User $user): array
    {
        $monthStart = now()->startOfMonth();
        $isDoctor = $this->isDoctor($user);

        $reviewedQuery = Document::where('status', DocumentStatusEnum::Completed->value)
            ->where('finalized_at', '>=', $monthStart);

        if ($isDoctor) {
            $reviewedQuery->where('finalized_by', $user->id);
        } else {
            $reviewedQuery->where('requester_id', $user->id);
        }

        $amountQuery = $isDoctor
            ? Document::where('documents.finalized_by', $user->id)
                ->where('documents.status', DocumentStatusEnum::Completed->value)
                ->where('documents.finalized_at', '>=', $monthStart)
                ->join('invoices', 'invoices.document_id', '=', 'documents.id')
                ->where('invoices.status', InvoiceStatusEnum::Paid->value)
            : Document::where('documents.requester_id', $user->id)
                ->join('invoices', 'invoices.document_id', '=', 'documents.id')
                ->where('invoices.status', InvoiceStatusEnum::Paid->value)
                ->where('invoices.paid_at', '>=', $monthStart);

        $nextShift = $isDoctor ? $this->shiftScheduleService->nextShiftStart($user, now()) : null;
        $onShift = $isDoctor && $this->shiftScheduleService->isOnShift($user, now());

        return [
            'pending_cases' => $this->pendingForUser($user)->count(),
            'monthly_reviewed' => $reviewedQuery->count(),
            'monthly_amount' => (int) $amountQuery->sum('invoices.amount'),
            'next_shift_hours' => $onShift ? 0 : ($nextShift ? (int) ceil(now()->diffInMinutes($nextShift, true) / 60) : null),
            'is_doctor' => $isDoctor,
        ];
    }

    protected function scopeVisibleTo($query, User $user): void
    {
        if ($this->isDoctor($user)) {
            $query->whereHas('assignments', fn ($assignmentQuery) => $assignmentQuery->where('user_id', $user->id));
            return;
        }

        $query->where('requester_id', $user->id)
            ->orWhereHas('assignments', fn ($assignmentQuery) => $assignmentQuery->where('user_id', $user->id));
    }

    public function isDoctor(User $user): bool
    {
        return $user->level === UserEnum::Doctor->value;
    }
}