<?php

namespace App\Models;

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

class Assegnazione extends Model
{
    protected $table = 'assegnazioni';

    protected $fillable = [
        'territorio_id',
        'proclamatore_id',
        'anno_teocratico_id',
        'assigned_at',
        'returned_at',
        'counted_in_campaign',
        'campaign_id',
        'pdf_access_code',
        'note',
        'created_by',
        'returned_by',
    ];

    protected function casts(): array
    {
        return [
            'assigned_at' => 'date',
            'returned_at' => 'date',
            'counted_in_campaign' => 'boolean',
        ];
    }

    // ─── Relationships ─────────────────────────────────────────

    public function territorio()
    {
        return $this->belongsTo(Territorio::class, 'territorio_id')->withTrashed();
    }

    public function proclamatore()
    {
        return $this->belongsTo(Proclamatore::class, 'proclamatore_id')->withTrashed();
    }

    public function annoTeocratico()
    {
        return $this->belongsTo(AnnoTeocratico::class, 'anno_teocratico_id');
    }

    public function campagna()
    {
        return $this->belongsTo(Campagna::class, 'campaign_id');
    }

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

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

    // ─── Computed ───────────────────────────────────────────────

    /**
     * Number of days between assignment and return (or today if still open).
     */
    public function getGiorniAttribute(): int
    {
        $end = $this->returned_at ?? now();
        return Carbon::parse($this->assigned_at)->diffInDays($end);
    }

    public function getIsApertaAttribute(): bool
    {
        return is_null($this->returned_at);
    }

    public function ensurePdfAccessCode(): string
    {
        if ($this->pdf_access_code) {
            return $this->pdf_access_code;
        }

        do {
            $code = strtoupper(Str::random(12));
        } while (static::query()->where('pdf_access_code', $code)->exists());

        $this->forceFill(['pdf_access_code' => $code])->saveQuietly();

        return $code;
    }

    public function temporaryPdfViewerUrl(): ?string
    {
        if (! $this->is_aperta || ! $this->territorio?->pdf_path) {
            return null;
        }

        return route('assignments.pdf.viewer', [
            'assignment' => $this->id,
            'code'       => $this->ensurePdfAccessCode(),
        ]);
    }

    public function shortPdfUrl(): ?string
    {
        if (! $this->is_aperta || ! $this->territorio?->pdf_path) {
            return null;
        }

        return route('assignments.pdf.short', ['code' => $this->ensurePdfAccessCode()]);
    }

    // ─── Scopes ─────────────────────────────────────────────────

    public function scopeAperte($query)
    {
        return $query->whereNull('returned_at');
    }

    public function scopeChiuse($query)
    {
        return $query->whereNotNull('returned_at');
    }

    public function scopePerAnnoTeocratico($query, $annoId)
    {
        return $query->where('anno_teocratico_id', $annoId);
    }

    // ─── Business Logic ─────────────────────────────────────────

    /**
     * Check if a campaign prompt should be shown when returning this assignment.
     * Returns the matching campaign or null.
     */
    public function campagnaApplicabile(?\Carbon\Carbon $returnDate = null): ?Campagna
    {
        $returnDate = $returnDate ?? now();

        return Campagna::where('start_date', '<=', $returnDate)
            ->where('end_date', '>=', $this->assigned_at)
            ->first();
    }
}