<?php

namespace App\Models;

use AdamWathan\EloquentOAuth\OAuthIdentity;
use App\Models\Concerns\InstanceCache;
use App\Models\Concerns\Reportable;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Notifications\Notifiable;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notification;
use MightyPork\Exceptions\ArgumentException;
use MightyPork\Exceptions\NotExistException;

/**
 * A user in the application
 *
 * @property int $id
 * @property \Carbon\Carbon $created_at
 * @property \Carbon\Carbon $updated_at
 * @property string $name - unique, for vanity URL
 * @property string $title - for display
 * @property string $bio - user bio
 * @property string $website - custom url
 * @property string $email - unique, for login and social auth chaining
 * @property string $password - hashed pw
 * @property bool $confirmed - user e-mail is confirmed
 * @property-read Proposal[]|Collection $proposals
 * @property-read Table[]|Collection $tables
 * @property-read OAuthIdentity[]|Collection $socialIdentities
 * @property-read TableComment[]|Collection $tableComments
 * @property-read Table[]|Collection $favouriteTables
 * @property-read Table[]|Collection $followedDiscussions
 * @property-read ContentReport[]|Collection $authoredReports
 * @property-read Notification[]|Collection $notifications
 * @property-read Notification[]|Collection $readNotifications
 * @property-read Notification[]|Collection $unreadNotifications
 * @property-read string $handle - user handle, including @
 */
class User extends Authenticatable
{
    use Reportable;
    use Notifiable;
    use InstanceCache;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name', 'title', 'email', 'password', 'bio', 'website'
    ];

    /**
     * The attributes that should be hidden for arrays.
     *
     * @var array
     */
    protected $hidden = [
        'password', 'remember_token',
    ];

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

        static::deleting(function(User $self) {
            // comments are deleted via cascade

            $self->reportsOf()->delete();

            // manually delete proposals to ensure row refcounts are updated
            foreach ($self->proposals as $proposal) {
                $proposal->delete();
            }

            foreach ($self->tables as $table) {
                $table->delete();
            }
        });
    }

    /** Owned tables */
    public function tables()
    {
        return $this->hasMany(Table::class, 'owner_id');
    }

    /** Assigned OAuth identities */
    public function socialIdentities()
    {
        return $this->hasMany(OAuthIdentity::class);
    }

    /** Authored proposals */
    public function proposals()
    {
        return $this->hasMany(Proposal::class, 'author_id');
    }

    /** Authored comments */
    public function tableComments()
    {
        return $this->hasMany(TableComment::class, 'author_id');
    }

    /** User's favourite tables (personal collection) */
    public function favouriteTables()
    {
        return $this->belongsToMany(Table::class, 'table_favourites');
    }

    /** Tables whose discussions user follows (this is similar to favourites) */
    public function followedDiscussions()
    {
        return $this->belongsToMany(Table::class, 'discussion_follows');
    }

    /** Reports sent by this user */
    public function authoredReports()
    {
        return $this->hasMany(ContentReport::class, 'author_id');
    }

    // --------- Relation Helpers ---------

    public function addFavourite(Table $table)
    {
        $this->favouriteTables()->attach($table);
    }

    public function removeFavourite(Table $table)
    {
        $this->favouriteTables()->detach($table);
    }

    public function followDiscussion(Table $table)
    {
        $this->followedDiscussions()->attach($table);
    }

    public function unfollowDiscussion(Table $table)
    {
        $this->followedDiscussions()->detach($table);
    }

    /**
     * Resolve user by a given name, id, or e-mail
     *
     * @param string $ident
     * @return User
     */
    public static function resolve($ident)
    {
        $ident = "$ident";
        if (strlen($ident) == 0) throw new ArgumentException("Can't find user by empty string.");

        if (is_numeric($ident)) {
            $u = static::find((int)$ident);
        }
        else if ($ident[0] == '@') {
            $u = static::where('name', substr($ident, 1))->first();
        }
        else {
            $u = static::where('email', $ident)->first();
        }

        if (!$u) throw new NotExistException("No user found matching \"$ident\"");

        return $u;
    }

    public function __get($name)
    {
        if ($name == 'handle') return "@$this->name";

        return parent::__get($name);
    }

    public function ownsTable(Table $table)
    {
        return $table->owner_id == $this->id;
    }

    public function favouritesTable(Table $table)
    {
        return \DB::table('table_favourites')
            ->where('user_id', $this->id)
            ->where('table_id', $table->id)->exists();
    }
}