<?php

namespace App\Models;

use App\Models\Concerns\BelongsToOwner;
use Carbon\CarbonInterface;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class StaffAssignment extends Model
{
    use BelongsToOwner, SoftDeletes;

    protected $table = 'care_staff_assignments';

    protected $fillable = [
        'owner_ref',
        'organization_id',
        'member_id',
        'department_id',
        'care_unit_id',
        'kind',
        'assignment_role',
        'shift_code',
        'starts_on',
        'ends_on',
        'status',
        'notes',
    ];

    protected function casts(): array
    {
        return [
            'starts_on' => 'date',
            'ends_on' => 'date',
        ];
    }

    public function organization(): BelongsTo
    {
        return $this->belongsTo(Organization::class, 'organization_id');
    }

    public function member(): BelongsTo
    {
        return $this->belongsTo(Member::class, 'member_id');
    }

    public function department(): BelongsTo
    {
        return $this->belongsTo(Department::class, 'department_id');
    }

    public function careUnit(): BelongsTo
    {
        return $this->belongsTo(CareUnit::class, 'care_unit_id');
    }

    /**
     * Legacy link from when duty roster auto-created unit placements.
     * Shift assignments live on RosterEntry; new roster rows do not set this.
     */
    public function rosterEntries(): HasMany
    {
        return $this->hasMany(RosterEntry::class, 'staff_assignment_id');
    }

    public function scopeUnitPlacements(Builder $query): Builder
    {
        return $query->whereDoesntHave('rosterEntries');
    }

    public function scopeEffectiveOn(Builder $query, CarbonInterface|string|null $date = null): Builder
    {
        $day = $date
            ? (\Illuminate\Support\Carbon::parse($date)->toDateString())
            : now()->toDateString();

        return $query
            ->whereDate('starts_on', '<=', $day)
            ->where(function (Builder $q) use ($day) {
                $q->whereNull('ends_on')->orWhereDate('ends_on', '>=', $day);
            });
    }

    public function scopeActiveStatus(Builder $query): Builder
    {
        return $query->where('status', 'active');
    }

    public function isEffectiveOn(CarbonInterface|string|null $date = null): bool
    {
        $day = $date
            ? \Illuminate\Support\Carbon::parse($date)->startOfDay()
            : now()->startOfDay();

        if ($this->starts_on->gt($day)) {
            return false;
        }

        if ($this->ends_on !== null && $this->ends_on->lt($day)) {
            return false;
        }

        return $this->status === 'active';
    }
}