<?php

namespace App\Models;

// use Illuminate\Contracts\Auth\MustVerifyEmail;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasOne;
use Illuminate\Database\Eloquent\Relations\HasMany;
use App\Models\Conversation;
use App\Models\ConversationParticipant;
use App\Models\Message;
use Illuminate\Database\Eloquent\SoftDeletes;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Illuminate\Support\Facades\DB;
use Laravel\Scout\Searchable;

class User extends Authenticatable
{
    /** @use HasFactory<\Database\Factories\UserFactory> */
    use HasFactory, Notifiable, SoftDeletes, Searchable;

    /**
     * The attributes that are mass assignable.
     *
     * @var list<string>
     */
    protected $fillable = [
        'username',
        'username_changed_at',
        'onboarding_step',
        'name',
        'email',
        'last_verification_sent_at',
        'verification_send_count_24h',
        'verification_send_window_started_at',
        'is_active',
        'needs_password_reset',
        'password',
        'role',
        'allow_messages_from',
    ];

    /**
     * The attributes that should be hidden for serialization.
     *
     * @var list<string>
     */
    protected $hidden = [
        'password',
        'remember_token',
    ];

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'email_verified_at' => 'datetime',
            'last_verification_sent_at' => 'datetime',
            'verification_send_window_started_at' => 'datetime',
            'verification_send_count_24h' => 'integer',
            'username_changed_at' => 'datetime',
            'deleted_at' => 'datetime',
            'password' => 'hashed',
            'allow_messages_from' => 'string',
        ];
    }

    public function artworks(): HasMany
    {
        return $this->hasMany(Artwork::class);
    }

    public function profile(): HasOne
    {
        return $this->hasOne(UserProfile::class, 'user_id');
    }

    public function statistics(): HasOne
    {
        return $this->hasOne(UserStatistic::class, 'user_id');
    }

    /** Users that follow this user */
    public function followers(): BelongsToMany
    {
        return $this->belongsToMany(
            User::class,
            'user_followers',
            'user_id',
            'follower_id'
        )->withPivot('created_at');
    }

    /** Users that this user follows */
    public function following(): BelongsToMany
    {
        return $this->belongsToMany(
            User::class,
            'user_followers',
            'follower_id',
            'user_id'
        )->withPivot('created_at');
    }

    public function profileComments(): HasMany
    {
        return $this->hasMany(ProfileComment::class, 'profile_user_id');
    }

    // ── Messaging ────────────────────────────────────────────────────────────

    public function conversations(): BelongsToMany
    {
        return $this->belongsToMany(Conversation::class, 'conversation_participants')
            ->withPivot(['role', 'last_read_at', 'is_muted', 'is_archived', 'is_pinned', 'pinned_at', 'joined_at', 'left_at'])
            ->wherePivotNull('left_at')
            ->orderByPivot('joined_at', 'desc');
    }

    public function conversationParticipants(): HasMany
    {
        return $this->hasMany(ConversationParticipant::class);
    }

    public function sentMessages(): HasMany
    {
        return $this->hasMany(Message::class, 'sender_id');
    }

    /**
     * Check if this user allows receiving messages from the given user.
     */
    public function allowsMessagesFrom(User $sender): bool
    {
        $pref = $this->allow_messages_from ?? 'everyone';

        return match ($pref) {
            'everyone'         => true,
            'followers'        => $this->followers()->where('follower_id', $sender->id)->exists(),
            'mutual_followers' => $this->followers()->where('follower_id', $sender->id)->exists()
                                  && $this->following()->where('user_id', $sender->id)->exists(),
            'nobody'           => false,
            default            => true,
        };
    }

    // ────────────────────────────────────────────────────────────────────────

    /** Artworks this user has added to their favourites. */
    public function favouriteArtworks(): BelongsToMany
    {
        return $this->belongsToMany(Artwork::class, 'artwork_favourites', 'user_id', 'artwork_id')
            ->withPivot('legacy_id')
            ->withTimestamps();
    }

    public function hasRole(string $role): bool
    {
        return strtolower((string) ($this->role ?? '')) === strtolower($role);
    }

    // ─── Follow helpers ───────────────────────────────────────────────────────

    /**
     * Whether $viewerId is following this user.
     * Uses a single indexed lookup – safe to call on every profile render.
     */
    public function isFollowedBy(int $viewerId): bool
    {
        if ($viewerId === $this->id) {
            return false;
        }

        return DB::table('user_followers')
            ->where('user_id', $this->id)
            ->where('follower_id', $viewerId)
            ->exists();
    }

    /**
     * Cached follower count from user_statistics.
     * Returns 0 if the statistics row does not exist yet.
     */
    public function getFollowersCountAttribute(): int
    {
        return (int) ($this->statistics?->followers_count ?? 0);
    }

    /**
     * Cached following count from user_statistics.
     */
    public function getFollowingCountAttribute(): int
    {
        return (int) ($this->statistics?->following_count ?? 0);
    }

    public function isAdmin(): bool
    {
        return $this->hasRole('admin');
    }

    public function isModerator(): bool
    {
        return $this->hasRole('moderator');
    }

    // ─── Meilisearch ──────────────────────────────────────────────────────────

    /**
     * Only index active users (not soft-deleted, is_active = true).
     */
    public function shouldBeSearchable(): bool
    {
        return (bool) $this->is_active && ! $this->trashed();
    }

    /**
     * Data indexed in Meilisearch.
     * Includes all v2 stat counters for top-creator sorting.
     */
    public function toSearchableArray(): array
    {
        $stats = $this->statistics;

        return [
            'id'                           => $this->id,
            'username'                     => strtolower((string) ($this->username ?? '')),
            'name'                         => $this->name,
            // Upload activity
            'uploads_count'                => (int) ($stats?->uploads_count ?? 0),
            // Creator-received metrics
            'downloads_received_count'     => (int) ($stats?->downloads_received_count ?? 0),
            'artwork_views_received_count' => (int) ($stats?->artwork_views_received_count ?? 0),
            'awards_received_count'        => (int) ($stats?->awards_received_count ?? 0),
            'favorites_received_count'     => (int) ($stats?->favorites_received_count ?? 0),
            'comments_received_count'      => (int) ($stats?->comments_received_count ?? 0),
            'reactions_received_count'     => (int) ($stats?->reactions_received_count ?? 0),
            // Social
            'followers_count'              => (int) ($stats?->followers_count ?? 0),
            'following_count'              => (int) ($stats?->following_count ?? 0),
            'created_at'                   => $this->created_at?->toISOString(),
        ];
    }
}