<?php

namespace App\Services\Brief;

final class WeeklyBriefContentBuilder
{
    /** @var list<array{type:string,text?:string,url?:string}> */
    private array $blocks = [];

    public function h1(string $text): self
    {
        $this->blocks[] = ['type' => 'h1', 'text' => $text];

        return $this;
    }

    public function h2(string $text): self
    {
        $this->blocks[] = ['type' => 'h2', 'text' => $text];

        return $this;
    }

    public function h3(string $text): self
    {
        $this->blocks[] = ['type' => 'h3', 'text' => $text];

        return $this;
    }

    public function paragraph(string $text): self
    {
        $text = trim($text);
        if ($text === '') {
            return $this;
        }
        $this->blocks[] = ['type' => 'p', 'text' => $text];

        return $this;
    }

    public function bullet(string $text): self
    {
        $this->blocks[] = ['type' => 'bullet', 'text' => $text];

        return $this;
    }

    public function link(string $label, string $url): self
    {
        $this->blocks[] = ['type' => 'link', 'text' => $label, 'url' => $url];

        return $this;
    }

    public function spacer(): self
    {
        $this->blocks[] = ['type' => 'spacer'];

        return $this;
    }

    /**
     * @return list<array{type:string,text?:string,url?:string}>
     */
    public function blocks(): array
    {
        return $this->blocks;
    }

    public function toPlainText(): string
    {
        $lines = [];
        foreach ($this->blocks as $block) {
            $type = $block['type'] ?? '';
            $text = trim((string) ($block['text'] ?? ''));

            match ($type) {
                'h1' => $lines[] = $text,
                'h2' => $lines[] = $text,
                'h3' => $lines[] = $text,
                'p' => $lines[] = $text,
                'bullet' => $lines[] = '· '.$text,
                'link' => $lines[] = $text !== '' ? $text.'：'.($block['url'] ?? '') : (string) ($block['url'] ?? ''),
                'spacer' => $lines[] = '',
                default => null,
            };
        }

        return trim(preg_replace("/\n{3,}/", "\n\n", implode("\n", $lines)) ?? '');
    }
}