<?php

namespace Longyi\Feishu\Messages;

/**
 * 构造飞书交互卡片。
 *
 * 卡片比纯文本贵不了多少，但值班的人一眼就能看到订单号、金额和原因，
 * 并且能直接点进后台，所以告警统一走卡片。
 */
class AlertCard
{
    protected array $fields = [];

    protected ?string $description = null;

    protected ?string $buttonUrl = null;

    protected ?string $buttonText = null;

    protected ?string $footer = null;

    public function __construct(
        protected string $title,
        protected string $color = 'red',
    ) {}

    public static function make(string $title, string $color = 'red'): static
    {
        return new static($title, $color);
    }

    /**
     * 正文首段，一般写这条告警发生了什么、需要人做什么。
     */
    public function description(?string $description): static
    {
        $this->description = $description;

        return $this;
    }

    /**
     * 追加一个「字段名: 值」。值为空时自动跳过，避免卡片出现空行。
     */
    public function field(string $label, mixed $value): static
    {
        if ($value === null || $value === '') {
            return $this;
        }

        $this->fields[] = ['label' => $label, 'value' => (string) $value];

        return $this;
    }

    public function button(?string $text, ?string $url): static
    {
        if ($text && $url) {
            $this->buttonText = $text;
            $this->buttonUrl = $url;
        }

        return $this;
    }

    public function footer(?string $footer): static
    {
        $this->footer = $footer;

        return $this;
    }

    /**
     * 输出可直接 POST 给 webhook 的消息体。
     */
    public function toMessage(): array
    {
        $elements = [];

        if ($this->description) {
            $elements[] = [
                'tag'  => 'div',
                'text' => ['tag' => 'lark_md', 'content' => $this->description],
            ];
        }

        if ($this->fields) {
            $elements[] = [
                'tag'    => 'div',
                'fields' => array_map(fn (array $field) => [
                    'is_short' => true,
                    'text'     => [
                        'tag'     => 'lark_md',
                        'content' => "**{$field['label']}**\n{$field['value']}",
                    ],
                ], $this->fields),
            ];
        }

        if ($this->buttonUrl) {
            $elements[] = [
                'tag'     => 'action',
                'actions' => [[
                    'tag'  => 'button',
                    'text' => ['tag' => 'plain_text', 'content' => $this->buttonText],
                    'url'  => $this->buttonUrl,
                    'type' => 'primary',
                ]],
            ];
        }

        if ($this->footer) {
            $elements[] = [
                'tag'      => 'note',
                'elements' => [['tag' => 'plain_text', 'content' => $this->footer]],
            ];
        }

        return [
            'msg_type' => 'interactive',
            'card'     => [
                'config' => ['wide_screen_mode' => true],
                'header' => [
                    'template' => $this->color,
                    'title'    => ['tag' => 'plain_text', 'content' => $this->title],
                ],
                'elements' => $elements,
            ],
        ];
    }
}