require 'rails_helper'

RSpec.describe Post, type: :model do
  before do
    PostUrlSanitisationRule.unscoped.delete_all
  end

  describe 'URL normalisation' do
    it 'normalises the HTTP URL before applying sanitisation rules' do
      PostUrlSanitisationRule.create!(
        priority: 10,
        source_pattern: '\\Ahttps://example\\.com/videos/([^/]+)\\z',
        replacement: 'https://example.com/watch/\\1'
      )

      post = described_class.create!(
        title: 'normalised URL',
        url: '  https://EXAMPLE.com/videos/123/  '
      )

      expect(post.url).to eq('https://example.com/watch/123')
    end

    it 'does not normalise an unchanged URL when another attribute changes' do
      post = create(:post)
      post.update_column(:url, 'https://EXAMPLE.com/unchanged/')

      post.update!(title: 'updated title')

      expect(post.reload.url).to eq('https://EXAMPLE.com/unchanged/')
    end

    it 'validates the sanitised URL length' do
      path = 'a' * 375

      PostUrlSanitisationRule.create!(
        priority: 10,
        source_pattern: '\\Ahttps://example\\.com/(a+)\\z',
        replacement: 'https://example.com/\\1\\1'
      )

      post = described_class.new(
        title: 'long URL',
        url: "https://example.com/#{ path }"
      )

      expect(post).to be_invalid
      expect(post.errors.details.fetch(:url)).to include(
        error: :too_long,
        count: 768
      )
    end

    it 'validates uniqueness after sanitisation' do
      PostUrlSanitisationRule.create!(
        priority: 10,
        source_pattern: '\\Ahttps://example\\.com/alias\\z',
        replacement: 'https://example.com/canonical'
      )
      create(:post, url: 'https://example.com/canonical')

      post = described_class.new(title: 'duplicate URL', url: 'https://example.com/alias')

      expect(post).to be_invalid
      expect(post.errors.details.fetch(:url)).to include(error: :taken, value: post.url)
    end
  end
end