<?php

/**
 * Resume Model
 * Professional Resume Builder - Resume Entity
 *
 * @author David Valera Melendez <david@valera-melendez.de>
 * @created 2025-08-08
 * @location Made in Germany 🇩🇪
 */

namespace App\Models;

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

/**
 * Resume Model
 * Represents user resumes with all personal and professional information
 */
class Resume extends Model
{
    use HasFactory, SoftDeletes;

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'user_id',
        'title',
        'template_id',
        'slug',
        'personal_info',
        'professional_summary',
        'work_experiences',
        'education',
        'skills',
        'languages',
        'certifications',
        'projects',
        'references',
        'custom_sections',
        'settings',
        'is_active',
        'is_completed',
        'is_public',
        'public_url',
        'created_at',
        'updated_at'
    ];

    /**
     * The attributes that should be cast.
     *
     * @var array<string, string>
     */
    protected $casts = [
        'personal_info' => 'array',
        'work_experiences' => 'array',
        'education' => 'array',
        'skills' => 'array',
        'languages' => 'array',
        'certifications' => 'array',
        'projects' => 'array',
        'references' => 'array',
        'custom_sections' => 'array',
        'settings' => 'array',
        'is_active' => 'boolean',
        'is_completed' => 'boolean',
        'is_public' => 'boolean',
    ];

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

    /**
     * Get the resume's public URL.
     */
    public function getPublicUrlAttribute(): ?string
    {
        if ($this->is_public && $this->public_url) {
            return route('public.resume', $this->public_url);
        }
        
        return null;
    }

    /**
     * Get the resume's preview URL.
     */
    public function getPreviewUrlAttribute(): string
    {
        return route('resume-builder.preview', $this);
    }

    /**
     * Get the resume's edit URL.
     */
    public function getEditUrlAttribute(): string
    {
        return route('resume-builder.edit', $this);
    }

    /**
     * Get the resume's PDF download URL.
     */
    public function getPdfUrlAttribute(): string
    {
        return route('resume-builder.download-pdf', $this);
    }

    /**
     * Calculate completion percentage of the resume.
     */
    public function getCompletionPercentageAttribute(): int
    {
        $sections = [
            'personal_info' => 25,
            'professional_summary' => 10,
            'work_experiences' => 30,
            'education' => 15,
            'skills' => 10,
            'languages' => 5,
            'certifications' => 5,
        ];

        $completed = 0;
        foreach ($sections as $section => $weight) {
            if ($this->isSectionCompleted($section)) {
                $completed += $weight;
            }
        }

        return min(100, $completed);
    }

    /**
     * Check if a specific section is completed.
     */
    public function isSectionCompleted(string $section): bool
    {
        $data = $this->$section;
        
        if (empty($data)) {
            return false;
        }

        switch ($section) {
            case 'personal_info':
                $required = ['first_name', 'last_name', 'email', 'phone'];
                foreach ($required as $field) {
                    if (empty($data[$field] ?? null)) {
                        return false;
                    }
                }
                return true;

            case 'professional_summary':
                return !empty($data) && strlen($data) >= 50;

            case 'work_experiences':
                return is_array($data) && count($data) > 0 && !empty($data[0]['company'] ?? null);

            case 'education':
                return is_array($data) && count($data) > 0 && !empty($data[0]['institution'] ?? null);

            case 'skills':
                return is_array($data) && count($data) > 0;

            default:
                return !empty($data);
        }
    }

    /**
     * Generate a unique slug for the resume.
     */
    public function generateSlug(): string
    {
        $baseSlug = str()->slug($this->title);
        $slug = $baseSlug;
        $counter = 1;

        while (static::where('slug', $slug)->where('id', '!=', $this->id)->exists()) {
            $slug = $baseSlug . '-' . $counter;
            $counter++;
        }

        return $slug;
    }

    /**
     * Generate a unique public URL for the resume.
     */
    public function generatePublicUrl(): string
    {
        return str()->random(32);
    }

    /**
     * Mark the resume as completed.
     */
    public function markAsCompleted(): void
    {
        $this->update(['is_completed' => true]);
    }

    /**
     * Scope a query to only include active resumes.
     */
    public function scopeActive($query)
    {
        return $query->where('is_active', true);
    }

    /**
     * Scope a query to only include completed resumes.
     */
    public function scopeCompleted($query)
    {
        return $query->where('is_completed', true);
    }

    /**
     * Scope a query to only include public resumes.
     */
    public function scopePublic($query)
    {
        return $query->where('is_public', true);
    }

    /**
     * Boot the model.
     */
    protected static function boot()
    {
        parent::boot();

        static::creating(function ($resume) {
            if (empty($resume->slug)) {
                $resume->slug = $resume->generateSlug();
            }
        });

        static::updating(function ($resume) {
            if ($resume->isDirty('title')) {
                $resume->slug = $resume->generateSlug();
            }
        });
    }
}