<?php

namespace App\Models\Admin;

use App\Models\Department;
use App\Models\User;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\SoftDeletes;

/**
 * 프로젝트 관리 - 이슈 모델
 *
 * @property int $id
 * @property int $project_id
 * @property int|null $task_id
 * @property string $title
 * @property string|null $description
 * @property string $type
 * @property string $status
 * @property int|null $created_by
 * @property int|null $updated_by
 * @property int|null $deleted_by
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 * @property \Carbon\Carbon|null $deleted_at
 */
class AdminPmIssue extends Model
{
    use SoftDeletes;

    protected $table = 'admin_pm_issues';

    protected $fillable = [
        'project_id',
        'task_id',
        'title',
        'description',
        'type',
        'status',
        'start_date',
        'due_date',
        'estimated_hours',
        'is_urgent',
        // 팀/담당자/고객사 (하이브리드)
        'department_id',
        'team',
        'assignee_id',
        'assignee_name',
        'client',
        'created_by',
        'updated_by',
        'deleted_by',
    ];

    protected $casts = [
        'project_id' => 'integer',
        'task_id' => 'integer',
        'start_date' => 'date',
        'due_date' => 'date',
        'estimated_hours' => 'integer',
        'is_urgent' => 'boolean',
        'department_id' => 'integer',
        'assignee_id' => 'integer',
        'created_by' => 'integer',
        'updated_by' => 'integer',
        'deleted_by' => 'integer',
    ];

    /**
     * 타입 상수
     */
    public const TYPE_BUG = 'bug';

    public const TYPE_FEATURE = 'feature';

    public const TYPE_IMPROVEMENT = 'improvement';

    /**
     * 상태 상수
     */
    public const STATUS_OPEN = 'open';

    public const STATUS_IN_PROGRESS = 'in_progress';

    public const STATUS_RESOLVED = 'resolved';

    public const STATUS_CLOSED = 'closed';

    /**
     * 타입 목록
     */
    public static function getTypes(): array
    {
        return [
            self::TYPE_BUG => '버그',
            self::TYPE_FEATURE => '기능',
            self::TYPE_IMPROVEMENT => '개선',
        ];
    }

    /**
     * 상태 목록
     */
    public static function getStatuses(): array
    {
        return [
            self::STATUS_OPEN => '대기중',
            self::STATUS_IN_PROGRESS => '처리중',
            self::STATUS_RESOLVED => '해결됨',
            self::STATUS_CLOSED => '종료',
        ];
    }

    /**
     * 타입별 필터
     */
    public function scopeType($query, string $type)
    {
        return $query->where('type', $type);
    }

    /**
     * 상태별 필터
     */
    public function scopeStatus($query, string $status)
    {
        return $query->where('status', $status);
    }

    /**
     * 열린 이슈 (open, in_progress)
     */
    public function scopeOpen($query)
    {
        return $query->whereIn('status', [self::STATUS_OPEN, self::STATUS_IN_PROGRESS]);
    }

    /**
     * 마감일 지난 이슈 (미해결)
     */
    public function scopeOverdue($query)
    {
        return $query->whereNotNull('due_date')
            ->where('due_date', '<', now()->startOfDay())
            ->whereIn('status', [self::STATUS_OPEN, self::STATUS_IN_PROGRESS]);
    }

    /**
     * 마감일 임박 (N일 이내, 미해결)
     */
    public function scopeDueSoon($query, int $days = 3)
    {
        return $query->whereNotNull('due_date')
            ->whereBetween('due_date', [now()->startOfDay(), now()->addDays($days)->endOfDay()])
            ->whereIn('status', [self::STATUS_OPEN, self::STATUS_IN_PROGRESS]);
    }

    /**
     * 주의 필요 이슈 (마감 초과 + 마감 임박 + 긴급)
     */
    public function scopeNeedsAttention($query)
    {
        return $query->whereIn('status', [self::STATUS_OPEN, self::STATUS_IN_PROGRESS])
            ->where(function ($q) {
                $q->where('is_urgent', true)
                    ->orWhere(function ($q2) {
                        $q2->whereNotNull('due_date')
                            ->where('due_date', '<=', now()->addDays(3)->endOfDay());
                    });
            });
    }

    /**
     * D-day 계산
     */
    public function getDdayAttribute(): ?int
    {
        if (! $this->due_date) {
            return null;
        }

        return now()->startOfDay()->diffInDays($this->due_date, false);
    }

    /**
     * 마감 상태 (overdue, due_soon, normal, null)
     */
    public function getDueStatusAttribute(): ?string
    {
        if (! $this->due_date || in_array($this->status, [self::STATUS_RESOLVED, self::STATUS_CLOSED])) {
            return null;
        }

        $dday = $this->dday;

        if ($dday < 0) {
            return 'overdue';
        }
        if ($dday <= 3) {
            return 'due_soon';
        }

        return 'normal';
    }

    /**
     * 관계: 프로젝트
     */
    public function project(): BelongsTo
    {
        return $this->belongsTo(AdminPmProject::class, 'project_id');
    }

    /**
     * 관계: 연결된 작업
     */
    public function task(): BelongsTo
    {
        return $this->belongsTo(AdminPmTask::class, 'task_id');
    }

    /**
     * 관계: 생성자
     */
    public function creator(): BelongsTo
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    /**
     * 관계: 수정자
     */
    public function updater(): BelongsTo
    {
        return $this->belongsTo(User::class, 'updated_by');
    }

    /**
     * 관계: 부서 (연동 시)
     */
    public function department(): BelongsTo
    {
        return $this->belongsTo(Department::class, 'department_id');
    }

    /**
     * 관계: 담당자 (연동 시)
     */
    public function assignee(): BelongsTo
    {
        return $this->belongsTo(User::class, 'assignee_id');
    }

    /**
     * 팀/부서 표시명 (FK 우선, 없으면 문자열)
     */
    public function getTeamDisplayAttribute(): ?string
    {
        if ($this->department_id && $this->department) {
            return $this->department->name;
        }

        return $this->team;
    }

    /**
     * 담당자 표시명 (FK 우선, 없으면 문자열)
     */
    public function getAssigneeDisplayAttribute(): ?string
    {
        if ($this->assignee_id && $this->assignee) {
            return $this->assignee->name;
        }

        return $this->assignee_name;
    }

    /**
     * 타입 아이콘
     */
    public function getTypeIconAttribute(): string
    {
        return match ($this->type) {
            self::TYPE_BUG => 'bug',
            self::TYPE_FEATURE => 'sparkles',
            self::TYPE_IMPROVEMENT => 'arrow-trending-up',
            default => 'question-mark-circle',
        };
    }

    /**
     * 상태 색상
     */
    public function getStatusColorAttribute(): string
    {
        return match ($this->status) {
            self::STATUS_OPEN => 'red',
            self::STATUS_IN_PROGRESS => 'yellow',
            self::STATUS_RESOLVED => 'green',
            self::STATUS_CLOSED => 'gray',
            default => 'gray',
        };
    }
}