<?php

namespace App\Models\Students;

use App\Models\BaseModel;
use App\Models\Students\StudentClass;
use App\Models\Schools\School;
use App\Models\Schools\SchoolClass;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Foundation\Auth\User as Authenticatable;
use Illuminate\Notifications\Notifiable;
use Laravel\Sanctum\HasApiTokens;

/**
 * 学生模型
 * @package App\Models\Students
 * @property int $id 主键ID
 * @property string $username 用户名
 * @property string|null $real_name 真实姓名
 * @property string $password 密码
 * @property string $salt 随机串
 * @property int $role 所属角色(2：学生 3：家长)
 * @property int $grade_id 年级ID
 * @property int $parent_id 家长ID
 * @property string|null $email 电子邮件
 * @property string|null $phone_number 手机号
 * @property string $title 头衔
 * @property string $avatar 头像URL
 * @property \Carbon\Carbon|null $reg_time 注册时间
 * @property string|null $reg_ip 注册IP
 * @property int $status 用户状态(0禁用1正常2欠费3未激活)
 * @property int $vip_level 常规VIP等级
 * @property int $sex 性别(1男2女0不填)
 * @property string|null $qq QQ号
 * @property string|null $examing_number 考号
 */
class Student extends Authenticatable
{
    use HasApiTokens, Notifiable;

    /**
     * 数据表名
     * @var string
     */
    protected $table = 'student';

    /**
     * 主键
     * @var string
     */
    protected $primaryKey = 'id';

    /**
     * 关闭自动时间戳
     * @var bool
     */
    public $timestamps = false;

    /**
     * 可批量赋值的字段
     * @var array
     */
    protected $fillable = [
        'username',
        'real_name',
        'password',
        'salt',
        'role',
        'grade_id',
        'parent_id',
        'email',
        'phone_number',
        'title',
        'avatar',
        'reg_time',
        'reg_ip',
        'status',
        'vip_level',
        'sex',
        'qq',
        'examing_number'
    ];

    /**
     * 隐藏的字段
     * @var array
     */
    protected $hidden = [
        'password',
        'salt',
    ];

    /**
     * 字段类型转换
     * @var array
     */
    protected $casts = [
        'reg_time' => 'datetime',
        'role' => 'integer',
        'grade_id' => 'integer',
        'parent_id' => 'integer',
        'status' => 'integer',
        'vip_level' => 'integer',
        'sex' => 'integer',
    ];

    /**
     * 角色常量
     */
    const ROLE_STUDENT = 2;  // 学生
    const ROLE_PARENT = 3;   // 家长

    /**
     * 状态常量
     */
    const STATUS_DISABLED = 0;    // 禁用
    const STATUS_NORMAL = 1;      // 正常
    const STATUS_ARREARS = 2;     // 欠费
    const STATUS_INACTIVE = 3;    // 未激活

    /**
     * 性别常量
     */
    const SEX_UNKNOWN = 0;  // 不填
    const SEX_MALE = 1;     // 男
    const SEX_FEMALE = 2;   // 女

    /**
     * 角色映射
     * @var array
     */
    public static $roleMap = [
        self::ROLE_STUDENT => '学生',
        self::ROLE_PARENT => '家长',
    ];

    /**
     * 状态映射
     * @var array
     */
    public static $statusMap = [
        self::STATUS_DISABLED => '禁用',
        self::STATUS_NORMAL => '正常',
        self::STATUS_ARREARS => '欠费',
        self::STATUS_INACTIVE => '未激活',
    ];

    /**
     * 性别映射
     * @var array
     */
    public static $sexMap = [
        self::SEX_UNKNOWN => '不填',
        self::SEX_MALE => '男',
        self::SEX_FEMALE => '女',
    ];

    /**
     * 获取学生班级关联
     * @return HasMany
     */
    public function studentClasses(): HasMany
    {
        return $this->hasMany(StudentClass::class, 'student_id', 'id');
    }

    /**
     * 获取学生所属班级（多对多）
     * @return BelongsToMany
     */
    public function classes(): BelongsToMany
    {
        return $this->belongsToMany(SchoolClass::class, 'student_class', 'student_id', 'class_id')
            ->withPivot(['join_time', 'leave_time', 'status', 'remark'])
            ->withTimestamps();
    }

    /**
     * 获取家长关联（如果是学生）
     * @return BelongsTo
     */
    public function parent(): BelongsTo
    {
        return $this->belongsTo(Student::class, 'parent_id', 'id');
    }

    /**
     * 获取子女关联（如果是家长）
     * @return HasMany
     */
    public function children(): HasMany
    {
        return $this->hasMany(Student::class, 'parent_id', 'id');
    }

    /**
     * 只查询学生
     * @param $query
     * @return mixed
     */
    public function scopeStudents($query)
    {
        return $query->where('role', self::ROLE_STUDENT);
    }

    /**
     * 只查询家长
     * @param $query
     * @return mixed
     */
    public function scopeParents($query)
    {
        return $query->where('role', self::ROLE_PARENT);
    }

    /**
     * 只查询正常状态
     * @param $query
     * @return mixed
     */
    public function scopeNormal($query)
    {
        return $query->where('status', self::STATUS_NORMAL);
    }

    /**
     * 按年级过滤
     * @param $query
     * @param int $gradeId
     * @return mixed
     */
    public function scopeByGrade($query, int $gradeId)
    {
        return $query->where('grade_id', $gradeId);
    }

    /**
     * 按性别过滤
     * @param $query
     * @param int $sex
     * @return mixed
     */
    public function scopeBySex($query, int $sex)
    {
        return $query->where('sex', $sex);
    }

    /**
     * 获取角色名称
     * @return string
     */
    public function getRoleNameAttribute(): string
    {
        return self::$roleMap[$this->role] ?? '未知';
    }

    /**
     * 获取状态名称
     * @return string
     */
    public function getStatusNameAttribute(): string
    {
        return self::$statusMap[$this->status] ?? '未知';
    }

    /**
     * 获取性别名称
     * @return string
     */
    public function getSexNameAttribute(): string
    {
        return self::$sexMap[$this->sex] ?? '未知';
    }

    /**
     * 获取头像URL（如果为空则返回默认头像）
     * @return string
     */
    public function getAvatarUrlAttribute(): string
    {
        return $this->avatar ?: '/images/default-avatar.png';
    }

    /**
     * 检查是否为学生
     * @return bool
     */
    public function isStudent(): bool
    {
        return $this->role === self::ROLE_STUDENT;
    }

    /**
     * 检查是否为家长
     * @return bool
     */
    public function isParent(): bool
    {
        return $this->role === self::ROLE_PARENT;
    }

    /**
     * 检查是否为正常状态
     * @return bool
     */
    public function isNormal(): bool
    {
        return $this->status === self::STATUS_NORMAL;
    }

    /**
     * 检查是否为男性
     * @return bool
     */
    public function isMale(): bool
    {
        return $this->sex === self::SEX_MALE;
    }

    /**
     * 检查是否为女性
     * @return bool
     */
    public function isFemale(): bool
    {
        return $this->sex === self::SEX_FEMALE;
    }

    /**
     * 获取当前所在班级
     * @return SchoolClass|null
     */
    public function getCurrentClass(): ?SchoolClass
    {
        $studentClass = $this->studentClasses()
            ->where('status', StudentClass::STATUS_NORMAL)
            ->whereNull('leave_time')
            ->first();

        return $studentClass ? $studentClass->schoolClass : null;
    }

    /**
     * 获取所有历史班级
     * @return \Illuminate\Database\Eloquent\Collection
     */
    public function getHistoryClasses()
    {
        return $this->classes()
            ->orderBy('student_class.join_time', 'desc')
            ->get();
    }

    /**
     * 密码加密
     * @param string $password
     * @param string $salt
     * @return string
     */
    public static function encryptPassword(string $password, string $salt): string
    {
        return md5($password . $salt);
    }

    /**
     * 验证密码
     * @param string $password
     * @return bool
     */
    public function verifyPassword(string $password): bool
    {
        return $this->password === self::encryptPassword($password, $this->salt);
    }

    /**
     * 生成随机盐值
     * @return string
     */
    public static function generateSalt(): string
    {
        return substr(md5(time() . mt_rand()), 0, 6);
    }

    /**
     * 获取完整信息（包含班级、家长等）
     * @return array
     */
    public function getFullInfo(): array
    {
        $info = $this->toArray();

        // 添加角色名称
        $info['role_name'] = $this->role_name;
        $info['status_name'] = $this->status_name;
        $info['sex_name'] = $this->sex_name;
        $info['avatar_url'] = $this->avatar_url;

        // 添加当前班级信息
        $currentClass = $this->getCurrentClass();
        $info['current_class'] = $currentClass ? $currentClass->toArray() : null;

        // 添加家长信息（如果是学生）
        if ($this->isStudent() && $this->parent_id) {
            $info['parent'] = $this->parent ? $this->parent->toArray() : null;
        }

        // 添加子女信息（如果是家长）
        if ($this->isParent()) {
            $info['children'] = $this->children->toArray();
        }

        return $info;
    }
}