<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Support\Str;

class Product extends Model
{
    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'title',
        'slug',
        'description',
        'website_url',
        'thumbnail',
        'user_id',
        'category_id',
        'status',
        'approved_at',
        'rejected_at',
    ];

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'approved_at' => 'datetime',
            'rejected_at' => 'datetime',
        ];
    }

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

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

        static::updating(function ($product) {
            if ($product->isDirty('title')) {
                $product->slug = static::generateUniqueSlug($product->title, $product->id);
            }
        });
    }

    /**
     * Generate a unique slug from the title.
     */
    protected static function generateUniqueSlug(string $title, ?int $ignoreId = null): string
    {
        $slug = Str::slug($title);
        $originalSlug = $slug;
        $counter = 1;

        while (static::slugExists($slug, $ignoreId)) {
            $slug = $originalSlug . '-' . $counter;
            $counter++;
        }

        return $slug;
    }

    /**
     * Check if a slug exists.
     */
    protected static function slugExists(string $slug, ?int $ignoreId = null): bool
    {
        $query = static::where('slug', $slug);

        if ($ignoreId) {
            $query->where('id', '!=', $ignoreId);
        }

        return $query->exists();
    }

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

    /**
     * Get the category that owns the product.
     */
    public function category(): BelongsTo
    {
        return $this->belongsTo(Category::class);
    }

    /**
     * Scope a query to only include approved products.
     */
    public function scopeApproved(Builder $query): Builder
    {
        return $query->where('status', 'approved');
    }

    /**
     * Scope a query to only include pending products.
     */
    public function scopePending(Builder $query): Builder
    {
        return $query->where('status', 'pending');
    }

    /**
     * Scope a query to only include rejected products.
     */
    public function scopeRejected(Builder $query): Builder
    {
        return $query->where('status', 'rejected');
    }

    /**
     * Scope a query to filter by status.
     */
    public function scopeByStatus(Builder $query, string $status): Builder
    {
        return $query->where('status', $status);
    }

    /**
     * Scope a query to search products by title and description.
     */
    public function scopeSearch(Builder $query, ?string $search): Builder
    {
        if (empty($search)) {
            return $query;
        }

        return $query->where(function ($subQuery) use ($search) {
            $subQuery->where('title', 'like', '%' . $search . '%')
                ->orWhere('description', 'like', '%' . $search . '%');
        });
    }

    /**
     * Scope a query to filter by category.
     */
    public function scopeByCategory(Builder $query, ?int $categoryId): Builder
    {
        if (empty($categoryId)) {
            return $query;
        }

        return $query->where('category_id', $categoryId);
    }

    /**
     * Scope a query to filter by date range.
     */
    public function scopeDateRange(Builder $query, ?string $range): Builder
    {
        if (empty($range)) {
            return $query;
        }

        return match($range) {
            'today' => $query->whereDate('created_at', today()),
            'week' => $query->where('created_at', '>=', now()->subWeek()),
            'month' => $query->where('created_at', '>=', now()->subMonth()),
            'year' => $query->where('created_at', '>=', now()->subYear()),
            default => $query,
        };
    }

    /**
     * Scope a query to sort products by popularity (upvotes count).
     */
    public function scopePopular(Builder $query): Builder
    {
        return $query->withCount('upvotes')->orderBy('upvotes_count', 'desc');
    }

    /**
     * Scope a query to sort products.
     */
    public function scopeSortBy(Builder $query, ?string $sort): Builder
    {
        if (empty($sort)) {
            return $query->latest();
        }

        return match($sort) {
            'popular' => $query->withCount('upvotes')->orderBy('upvotes_count', 'desc'),
            'oldest' => $query->oldest(),
            'newest' => $query->latest(),
            default => $query->latest(),
        };
    }

    /**
     * Get the product's thumbnail URL.
     */
    public function getThumbnailUrlAttribute(): ?string
    {
        if ($this->thumbnail) {
            return asset('storage/' . $this->thumbnail);
        }
        return null;
    }

    /**
     * Check if the product is pending.
     */
    public function isPending(): bool
    {
        return $this->status === 'pending';
    }

    /**
     * Check if the product is approved.
     */
    public function isApproved(): bool
    {
        return $this->status === 'approved';
    }

    /**
     * Check if the product is rejected.
     */
    public function isRejected(): bool
    {
        return $this->status === 'rejected';
    }

    /**
     * Approve the product.
     */
    public function approve(): void
    {
        $this->update([
            'status' => 'approved',
            'approved_at' => now(),
            'rejected_at' => null,
        ]);
    }

    /**
     * Reject the product.
     */
    public function reject(): void
    {
        $this->update([
            'status' => 'rejected',
            'rejected_at' => now(),
            'approved_at' => null,
        ]);
    }

    /**
     * Get the upvotes for the product.
     */
    public function upvotes()
    {
        return $this->hasMany(Upvote::class);
    }

    /**
     * Get the comments for the product.
     */
    public function comments()
    {
        return $this->hasMany(Comment::class)->latest();
    }

    /**
     * Get the bookmarks for the product.
     */
    public function bookmarks()
    {
        return $this->hasMany(Bookmark::class);
    }

    /**
     * Check if a user has upvoted the product.
     */
    public function isUpvotedBy(?User $user): bool
    {
        if (!$user) {
            return false;
        }

        return $this->upvotes()->where('user_id', $user->id)->exists();
    }

    /**
     * Check if a user has bookmarked the product.
     */
    public function isBookmarkedBy(?User $user): bool
    {
        if (!$user) {
            return false;
        }

        return $this->bookmarks()->where('user_id', $user->id)->exists();
    }

    /**
     * Get the upvotes count for the product.
     */
    public function getUpvotesCountAttribute(): int
    {
        return $this->upvotes()->count();
    }

    /**
     * Get the comments count for the product.
     */
    public function getCommentsCountAttribute(): int
    {
        return $this->comments()->count();
    }
}