<?php

namespace App\Models\HR;

use App\Models\Tenants\Department;
use App\Models\User;
use App\Traits\ModelTrait;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Employee extends Model
{
    use ModelTrait;

    const EMPLOYMENT_TYPES = [
        'regular' => '정규직',
        'contract' => '계약직',
        'daily' => '일용직',
        'freelancer' => '프리랜서',
    ];

    protected $table = 'tenant_user_profiles';

    protected $fillable = [
        'tenant_id',
        'user_id',
        'department_id',
        'position_key',
        'job_title_key',
        'work_location_key',
        'employment_type_key',
        'employee_status',
        'worker_type',
        'manager_user_id',
        'json_extra',
        'profile_photo_path',
        'display_name',
    ];

    protected static function booted(): void
    {
        static::addGlobalScope('employee', function (Builder $builder) {
            $builder->where(function ($q) {
                $q->where('worker_type', 'employee')
                    ->orWhereNull('worker_type');
            });
        });
    }

    protected $casts = [
        'json_extra' => 'array',
        'tenant_id' => 'int',
        'user_id' => 'int',
        'department_id' => 'int',
        'manager_user_id' => 'int',
    ];

    protected $appends = [
        'hire_date',
        'resign_date',
        'position_label',
        'job_title_label',
    ];

    // =========================================================================
    // 관계 정의
    // =========================================================================

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

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

    public function manager(): BelongsTo
    {
        return $this->belongsTo(User::class, 'manager_user_id');
    }

    // =========================================================================
    // json_extra Accessor
    // =========================================================================

    public function getHireDateAttribute(): ?string
    {
        return $this->json_extra['hire_date'] ?? null;
    }

    public function getResignDateAttribute(): ?string
    {
        return $this->json_extra['resign_date'] ?? null;
    }

    public function getAddressAttribute(): ?string
    {
        return $this->json_extra['address'] ?? null;
    }

    public function getEmergencyContactAttribute(): ?string
    {
        return $this->json_extra['emergency_contact'] ?? null;
    }

    public function getResidentNumberAttribute(): ?string
    {
        return $this->json_extra['resident_number'] ?? null;
    }

    public function getPersonalEmailAttribute(): ?string
    {
        return $this->json_extra['personal_email'] ?? null;
    }

    public function getBankAccountAttribute(): ?array
    {
        return $this->json_extra['bank_account'] ?? null;
    }

    public function getDependentsAttribute(): array
    {
        return $this->json_extra['dependents'] ?? [];
    }

    public function getPositionLabelAttribute(): ?string
    {
        if (! $this->position_key || ! $this->tenant_id) {
            return $this->position_key;
        }

        $position = Position::where('tenant_id', $this->tenant_id)
            ->where('type', Position::TYPE_RANK)
            ->where('key', $this->position_key)
            ->first();

        return $position?->name ?? $this->position_key;
    }

    public function getJobTitleLabelAttribute(): ?string
    {
        if (! $this->job_title_key || ! $this->tenant_id) {
            return $this->job_title_key;
        }

        $position = Position::where('tenant_id', $this->tenant_id)
            ->where('type', Position::TYPE_TITLE)
            ->where('key', $this->job_title_key)
            ->first();

        return $position?->name ?? $this->job_title_key;
    }

    // =========================================================================
    // json_extra 헬퍼
    // =========================================================================

    public function getJsonExtraValue(string $key, mixed $default = null): mixed
    {
        return $this->json_extra[$key] ?? $default;
    }

    public function setJsonExtraValue(string $key, mixed $value): void
    {
        $extra = $this->json_extra ?? [];
        if ($value === null) {
            unset($extra[$key]);
        } else {
            $extra[$key] = $value;
        }
        $this->json_extra = $extra;
    }

    // =========================================================================
    // 연봉 정보 (salary_info) — 민감 데이터, 별도 접근 제어
    // =========================================================================

    public function getSalaryInfo(): array
    {
        $defaults = [
            'annual_salary' => null,
            'effective_date' => null,
            'notes' => null,
            'fixed_overtime_hours' => null,
            'meal_allowance' => 200000,
            'monthly_salary' => null,
            'base_salary' => null,
            'fixed_overtime_pay' => null,
            'hourly_wage' => null,
            'monthly_work_hours' => 209,
            'overtime_multiplier' => 1.5,
            'history' => [],
        ];

        $data = $this->json_extra['salary_info'] ?? [];

        return array_merge($defaults, $data);
    }

    public function setSalaryInfo(array $data): void
    {
        $current = $this->getSalaryInfo();
        $history = $current['history'] ?? [];

        // 기존 연봉이 있으면 이력에 추가
        if ($current['annual_salary'] !== null) {
            $history[] = [
                'annual_salary' => $current['annual_salary'],
                'fixed_overtime_hours' => $current['fixed_overtime_hours'],
                'meal_allowance' => $current['meal_allowance'],
                'base_salary' => $current['base_salary'],
                'fixed_overtime_pay' => $current['fixed_overtime_pay'],
                'effective_date' => $current['effective_date'],
                'notes' => $current['notes'],
                'recorded_at' => now()->format('Y-m-d H:i:s'),
                'recorded_by' => auth()->user()?->name ?? '-',
            ];
        }

        $annualSalary = $data['annual_salary'] ?? null;
        $mealAllowance = $data['meal_allowance'] ?? 200000;
        $fixedOvertimeHours = $data['fixed_overtime_hours'] ?? null;
        $breakdown = $this->calculateSalaryBreakdown($annualSalary, $mealAllowance, $fixedOvertimeHours);

        $this->setJsonExtraValue('salary_info', array_merge([
            'annual_salary' => $annualSalary,
            'effective_date' => $data['effective_date'] ?? null,
            'notes' => $data['notes'] ?? null,
            'fixed_overtime_hours' => $fixedOvertimeHours,
            'meal_allowance' => $mealAllowance,
        ], $breakdown, ['history' => $history]));
    }

    /**
     * 급여 산정 계산
     *
     * 공식: (기본급 + 식대) = 월급여 × 209 / (209 + 고정연장근로시간 × 1.5)
     */
    private function calculateSalaryBreakdown(?int $annualSalary, int $mealAllowance, ?int $fixedOvertimeHours): array
    {
        $monthlyWorkHours = 209;
        $overtimeMultiplier = 1.5;

        if (! $annualSalary) {
            return [
                'monthly_salary' => null,
                'base_salary' => null,
                'fixed_overtime_pay' => null,
                'hourly_wage' => null,
                'monthly_work_hours' => $monthlyWorkHours,
                'overtime_multiplier' => $overtimeMultiplier,
            ];
        }

        $monthlySalary = (int) round($annualSalary / 12);
        $otFactor = ($fixedOvertimeHours ?? 0) * $overtimeMultiplier;
        $basePlusMeal = (int) round($monthlySalary * $monthlyWorkHours / ($monthlyWorkHours + $otFactor));
        $baseSalary = $basePlusMeal - $mealAllowance;
        $hourlyWage = (int) floor($basePlusMeal / $monthlyWorkHours);
        $fixedOvertimePay = $monthlySalary - $baseSalary - $mealAllowance;

        return [
            'monthly_salary' => $monthlySalary,
            'base_salary' => $baseSalary,
            'fixed_overtime_pay' => $fixedOvertimePay,
            'hourly_wage' => $hourlyWage,
            'monthly_work_hours' => $monthlyWorkHours,
            'overtime_multiplier' => $overtimeMultiplier,
        ];
    }

    /**
     * toArray 시 salary_info 제거 (일반 API 응답에서 연봉 정보 노출 방지)
     */
    public function toArray(): array
    {
        $array = parent::toArray();

        if (isset($array['json_extra']['salary_info'])) {
            unset($array['json_extra']['salary_info']);
        }

        return $array;
    }

    // =========================================================================
    // 스코프
    // =========================================================================

    public function scopeForTenant($query, ?int $tenantId = null)
    {
        $tenantId = $tenantId ?? session('selected_tenant_id');
        if ($tenantId) {
            return $query->where('tenant_id', $tenantId);
        }

        return $query;
    }

    public function scopeActiveEmployees($query)
    {
        return $query->where('employee_status', 'active');
    }

    public function scopeOnLeave($query)
    {
        return $query->where('employee_status', 'leave');
    }

    public function scopeResigned($query)
    {
        return $query->where('employee_status', 'resigned');
    }
}