<?php

namespace App\Models;

use App\Support\TeacherLibraryStatus;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Teacher extends Model
{
    use SoftDeletes;

    protected $fillable = [
        'name',
        'university_id',
        'university_text',
        'department',
        'bio',
        'city',
        'title',
        'phone',
        'email',
        'miniapp_user_id',
        'source_dict_item_id',
        'star_level_dict_item_id',
        'status_dict_item_id',
        'library_status',
        'approved_at',
        'approved_by',
        'next_follow_date',
        'next_follow_subject',
        'is_partner',
        'converted_at',
        'remark',
        'sort',
    ];

    protected $casts = [
        'university_id' => 'integer',
        'miniapp_user_id' => 'integer',
        'source_dict_item_id' => 'integer',
        'star_level_dict_item_id' => 'integer',
        'status_dict_item_id' => 'integer',
        'library_status' => 'string',
        'approved_at' => 'datetime',
        'approved_by' => 'integer',
        'next_follow_date' => 'date',
        'is_partner' => 'boolean',
        'converted_at' => 'datetime',
        'sort' => 'integer',
    ];

    protected $attributes = [
        'library_status' => TeacherLibraryStatus::Active,
    ];

    public function approvedBy(): BelongsTo
    {
        return $this->belongsTo(AdminUser::class, 'approved_by');
    }

    public function scopeInLibrary(Builder $query): Builder
    {
        return $query->where('library_status', TeacherLibraryStatus::Active);
    }

    public function scopeLinkable(Builder $query): Builder
    {
        return $query->whereIn('library_status', TeacherLibraryStatus::linkable());
    }

    public function isInLibrary(): bool
    {
        return $this->library_status === TeacherLibraryStatus::Active;
    }

    public function university(): BelongsTo
    {
        return $this->belongsTo(University::class);
    }

    /** 列表/详情展示用：优先高校库名称，否则抓取原文 */
    public function displayUniversityName(): ?string
    {
        $linked = $this->university?->name;
        if ($linked !== null && $linked !== '') {
            return $linked;
        }

        $text = trim((string) ($this->university_text ?? ''));

        return $text !== '' ? $text : null;
    }

    public function miniappUser(): BelongsTo
    {
        return $this->belongsTo(MiniappUser::class);
    }

    public function sourceItem(): BelongsTo
    {
        return $this->belongsTo(DictItem::class, 'source_dict_item_id');
    }

    public function starLevelItem(): BelongsTo
    {
        return $this->belongsTo(DictItem::class, 'star_level_dict_item_id');
    }

    public function statusItem(): BelongsTo
    {
        return $this->belongsTo(DictItem::class, 'status_dict_item_id');
    }

    public function followRecords(): HasMany
    {
        return $this->hasMany(TeacherFollowRecord::class)->orderByDesc('followed_at')->orderByDesc('id');
    }

    public function researchDirections(): BelongsToMany
    {
        return $this->belongsToMany(
            ResearchDirection::class,
            'teacher_research_direction',
            'teacher_id',
            'research_direction_id'
        )->orderBy('research_directions.sort')->orderBy('research_directions.name');
    }

    public function papers(): BelongsToMany
    {
        return $this->belongsToMany(Paper::class, 'teacher_papers')->withTimestamps();
    }

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