<?php

namespace App\Models\Business;

use App\Abstracts\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;

class SystemizationTodo extends Model
{
    public const STATUS_INCOMPLETE = '未完成';

    public const STATUS_COMPLETED = '已完成';

    public const STATUSES = [
        self::STATUS_INCOMPLETE,
        self::STATUS_COMPLETED,
    ];

    public const LEGACY_INCOMPLETE_STATUSES = ['待办', '进行中', '已延期'];

    // Keep old constant names for imports and existing callers without rewriting data.
    public const STATUS_PENDING = self::STATUS_INCOMPLETE;

    public const STATUS_IN_PROGRESS = self::STATUS_INCOMPLETE;

    public const STATUS_DELAYED = self::STATUS_INCOMPLETE;

    protected $table = 'business_systemization_todos';

    protected $fillable = [
        'company_id',
        'category',
        'section',
        'title',
        'owner',
        'assignee',
        'start_date',
        'start_note',
        'due_date',
        'due_note',
        'status',
        'completed_at',
        'progress',
        'notes',
        'sort_order',
        'source_key',
        'imported_at',
        'created_by',
        'updated_by',
    ];

    protected $casts = [
        'company_id' => 'integer',
        'start_date' => 'date',
        'due_date' => 'date',
        'completed_at' => 'date',
        'sort_order' => 'integer',
        'imported_at' => 'datetime',
    ];

    public function attachments(): HasMany
    {
        return $this->hasMany(SystemizationTodoAttachment::class, 'systemization_todo_id')
            ->orderBy('id');
    }

    public function isCompleted(): bool
    {
        return $this->status === self::STATUS_COMPLETED;
    }

    public function statusLabel(): string
    {
        return $this->isCompleted() ? self::STATUS_COMPLETED : self::STATUS_INCOMPLETE;
    }

    public static function mergeNotesIntoProgress(?string $progress, ?string $notes): ?string
    {
        $progress = trim(str_replace(["\r\n", "\r"], "\n", (string) $progress));
        $notes = trim(str_replace(["\r\n", "\r"], "\n", (string) $notes));
        if ($notes === '') {
            return $progress !== '' ? $progress : null;
        }
        if ($progress === '' || str_contains($progress, $notes)) {
            return $progress !== '' ? $progress : $notes;
        }

        return $progress . "\n" . $notes;
    }

    public function displayProgress(): string
    {
        $progress = trim((string) self::mergeNotesIntoProgress($this->progress, $this->notes));
        if ($progress === '') {
            return '';
        }

        $normalized = (string) preg_replace('/[\s。.]+$/u', '', $progress);

        return $this->isCompleted() && $normalized === self::STATUS_COMPLETED
            ? ''
            : $progress;
    }

    public function reminder(): array
    {
        if ($this->isCompleted()) {
            return ['label' => '—', 'tone' => 'muted'];
        }
        if ($this->due_date === null) {
            return ['label' => '时间待定', 'tone' => 'muted'];
        }

        $today = today()->startOfDay();
        $dueDate = $this->due_date->copy()->startOfDay();
        if ($dueDate->lt($today)) {
            return [
                'label' => '逾期 ' . $dueDate->diffInDays($today) . ' 天',
                'tone' => 'danger',
            ];
        }
        if ($dueDate->equalTo($today)) {
            return ['label' => '今天到期', 'tone' => 'warning'];
        }

        return [
            'label' => '剩余 ' . $today->diffInDays($dueDate) . ' 天',
            'tone' => 'info',
        ];
    }
}