<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Support\Str;

class Job extends Model
{
    use SoftDeletes;

    protected static function boot()
    {
        parent::boot();

        static::creating(function ($job) {
            if (empty($job->slug)) {
                $job->slug = static::generateUniqueSlug($job->title, $job->company);
            }
        });

        static::updating(function ($job) {
            if ($job->isDirty('title') && empty($job->slug)) {
                $job->slug = static::generateUniqueSlug($job->title, $job->company);
            }
        });
    }

    protected $fillable = [
        'external_id',
        'slug',
        'title',
        'company',
        'description',
        'location',
        'salary_min',
        'salary_max',
        'salary_currency',
        'job_type',
        'job_source_id',
        'source_url',
        'apply_url',
        'posted_at',
        'expires_at',
        'remote_allowed',
        'is_curated',
        'experience_level',
        'job_category_id',
        'job_location_id',
        'fingerprint',
    ];

    protected $casts = [
        'posted_at' => 'datetime',
        'expires_at' => 'datetime',
        'remote_allowed' => 'boolean',
        'is_curated' => 'boolean',
        'salary_min' => 'decimal:2',
        'salary_max' => 'decimal:2',
    ];

    /**
     * Get the source that provides this job.
     */
    public function source(): BelongsTo
    {
        return $this->belongsTo(JobSource::class, 'job_source_id');
    }

    /**
     * Get the category that this job belongs to.
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(JobCategory::class, 'job_category_id');
    }

    /**
     * Get the location of this job.
     */
    public function jobLocation(): BelongsTo
    {
        return $this->belongsTo(JobLocation::class, 'job_location_id');
    }

    /**
     * Get the users who saved this job.
     */
    public function savedByUsers(): BelongsToMany
    {
        return $this->belongsToMany(User::class, 'user_saved_jobs')
            ->withTimestamps();
    }

    /**
     * Get the tags for this job.
     */
    public function tags(): BelongsToMany
    {
        return $this->belongsToMany(Tag::class);
    }

    /**
     * Scope a query to only include active jobs.
     */
    public function scopeActive($query)
    {
        return $query->where(function ($q) {
            $q->whereNull('expires_at')
                ->orWhere('expires_at', '>', now());
        });
    }

    /**
     * Scope a query to only include uncurated jobs.
     */
    public function scopeUncurated($query)
    {
        return $query->where('is_curated', false);
    }

    /**
     * Scope a query to only include remote jobs.
     */
    public function scopeRemote($query)
    {
        return $query->where('remote_allowed', true);
    }

    /**
     * Scope a query to filter by job type.
     */
    public function scopeOfType($query, string $type)
    {
        return $query->where('job_type', $type);
    }

    /**
     * Scope a query to filter by experience level.
     */
    public function scopeExperienceLevel($query, string $level)
    {
        return $query->where('experience_level', $level);
    }

    /**
     * Scope a query to search by keywords in title, company, and description.
     */
    public function scopeSearchKeywords($query, string $keywords)
    {
        return $query->where(function ($q) use ($keywords) {
            $q->where('title', 'LIKE', "%{$keywords}%")
              ->orWhere('company', 'LIKE', "%{$keywords}%")
              ->orWhere('description', 'LIKE', "%{$keywords}%");
        });
    }

    /**
     * Scope a query to filter by category.
     */
    public function scopeInCategory($query, int $categoryId)
    {
        return $query->where('job_category_id', $categoryId);
    }

    /**
     * Scope a query to filter by location.
     */
    public function scopeInLocation($query, string $location)
    {
        return $query->where(function ($q) use ($location) {
            $q->where('location', 'LIKE', "%{$location}%")
              ->orWhereHas('jobLocation', function ($q2) use ($location) {
                  $q2->where('city', 'LIKE', "%{$location}%")
                     ->orWhere('state', 'LIKE', "%{$location}%")
                     ->orWhere('country', 'LIKE', "%{$location}%");
              });
        });
    }

    /**
     * Scope a query to filter by salary range.
     */
    public function scopeWithinSalaryRange($query, ?float $minSalary = null, ?float $maxSalary = null)
    {
        if ($minSalary) {
            $query->where(function ($q) use ($minSalary) {
                $q->where('salary_max', '>=', $minSalary)
                  ->orWhereNull('salary_max');
            });
        }

        if ($maxSalary) {
            $query->where(function ($q) use ($maxSalary) {
                $q->where('salary_min', '<=', $maxSalary)
                  ->orWhereNull('salary_min');
            });
        }

        return $query;
    }

    /**
     * Scope a query to filter by posted date.
     */
    public function scopePostedWithin($query, int $days)
    {
        return $query->where(function ($q) use ($days) {
            $q->where('posted_at', '>=', now()->subDays($days))
              ->orWhere(function ($q2) use ($days) {
                  $q2->whereNull('posted_at')
                     ->where('created_at', '>=', now()->subDays($days));
              });
        });
    }

    /**
     * Scope a query to filter by company.
     */
    public function scopeByCompany($query, string $company)
    {
        return $query->where('company', 'LIKE', "%{$company}%");
    }

    /**
     * Generate a unique slug for the job.
     */
    public static function generateUniqueSlug(string $title, ?string $company = null): string
    {
        // Create base slug from title
        $baseSlug = Str::slug($title);

        // Add company to slug if provided for better uniqueness
        if ($company) {
            $baseSlug .= '-' . Str::slug(Str::limit($company, 30, ''));
        }

        // Limit slug length to avoid database issues
        $baseSlug = Str::limit($baseSlug, 200, '');

        $slug = $baseSlug;
        $counter = 1;

        // Check if slug exists and append counter if needed
        while (static::withTrashed()->where('slug', $slug)->exists()) {
            $slug = $baseSlug . '-' . $counter;
            $counter++;
        }

        return $slug;
    }

    /**
     * Get the route key for the model.
     */
    public function getRouteKeyName(): string
    {
        return 'slug';
    }
}