<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Carbon\Carbon;

class KpiAchievement extends Model
{
    use HasFactory;
    
    protected $fillable = [
        'user_id',
        'kpi_target_id',
        'target_value',
        'actual_value',
        'achievement_percentage',
        'year',
        'month',
        'notes'
    ];

    protected $casts = [
        'achievement_percentage' => 'decimal:2',
        'year' => 'integer',
        'month' => 'integer'
    ];

    protected $attributes = [
        'actual_value' => 0,
        'achievement_percentage' => 0
    ];

    /**
     * Get the user that owns the achievement
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    /**
     * Get the KPI target for this achievement
     */
    public function kpiTarget(): BelongsTo
    {
        return $this->belongsTo(KpiTarget::class);
    }

    /**
     * Scope to get achievements for specific year and month
     */
    public function scopeForPeriod($query, $year, $month)
    {
        return $query->where('year', $year)->where('month', $month);
    }

    /**
     * Scope to get achievements for current month
     */
    public function scopeCurrentMonth($query)
    {
        return $query->where('year', now()->year)->where('month', now()->month);
    }

    /**
     * Scope to get achievements within year range
     */
    public function scopeWithinYearRange($query, $startYear, $endYear)
    {
        return $query->whereBetween('year', [$startYear, $endYear]);
    }

    /**
     * Scope to get achievements for specific user
     */
    public function scopeForUser($query, $userId)
    {
        return $query->where('user_id', $userId);
    }

    /**
     * Get achievement status
     */
    public function getStatusAttribute(): string
    {
        if ($this->achievement_percentage >= 100) {
            return 'exceeded';
        } elseif ($this->achievement_percentage >= 80) {
            return 'good';
        } elseif ($this->achievement_percentage >= 60) {
            return 'fair';
        } else {
            return 'poor';
        }
    }

    /**
     * Get status color for display
     */
    public function getStatusColorAttribute(): string
    {
        return match($this->status) {
            'exceeded' => 'success',
            'good' => 'info',
            'fair' => 'warning',
            'poor' => 'danger',
            default => 'secondary'
        };
    }

    /**
     * Get period display name (e.g., "Januari 2024")
     */
    public function getPeriodDisplayName(): string
    {
        $monthNames = [
            1 => 'Januari', 2 => 'Februari', 3 => 'Maret', 4 => 'April',
            5 => 'Mei', 6 => 'Juni', 7 => 'Juli', 8 => 'Agustus',
            9 => 'September', 10 => 'Oktober', 11 => 'November', 12 => 'Desember'
        ];
        
        return $monthNames[$this->month] . ' ' . $this->year;
    }

    /**
     * Get period start date
     */
    public function getPeriodStartDate(): Carbon
    {
        return Carbon::createFromDate($this->year, $this->month, 1);
    }

    /**
     * Get period end date
     */
    public function getPeriodEndDate(): Carbon
    {
        return Carbon::createFromDate($this->year, $this->month, 1)->endOfMonth();
    }

    /**
     * Get target value (from stored value or from relation)
     */
    public function getTargetValueAttribute(): int
    {
        // Return stored target value if available, otherwise get from relation
        return $this->target_value ?? $this->kpiTarget?->target_value ?? 0;
    }

    /**
     * Get current target value from relation (for comparison)
     */
    public function getCurrentTargetValueAttribute(): int
    {
        return $this->kpiTarget?->target_value ?? 0;
    }

    /**
     * Check if stored target value differs from current target value
     */
    public function hasTargetValueChanged(): bool
    {
        return $this->target_value !== $this->current_target_value;
    }
}