#!/usr/bin/env ruby
# frozen_string_literal: true

require "rubygems"
require "bundler/setup"
require "find"
require "haml"

error_count = 0
warning_count = 0

# Patterns that compile but produce wrong HTML in Haml 7.
# e.g. `.text-base-content\\/60` creates class "text-base-content" with text "\/60"
# instead of class "text-base-content/60".  Use {class: "..."} attribute hashes.
SUSPECT_CLASS_PATTERNS = [
  %r{^\s*[%.]\S*\\/}, # escaped slash in dot-notation:  .foo\/bar
  /^\s*[%.]\S*\\:/, # escaped colon in dot-notation:  .hover\:bg-red
].freeze

Find.find(File.expand_path("../../app/views", __dir__)) do |path|
  next unless path.end_with?(".haml")

  source = File.read(path)

  # --- Errors ---
  begin
    compiled = Haml::Engine.new.call(source)
    # Check for Ruby syntax errors in the compiled code
    # Wrapping in a `def` so `yield` and `return` in templates don't trigger syntax errors.
    RubyVM::InstructionSequence.compile("def _haml_compilation_test\n#{compiled}\nend\n")
  rescue Haml::SyntaxError => e
    $stderr.puts "\nFile: #{path}"
    $stderr.puts e.message
    error_count += 1
    next
  rescue SyntaxError => e
    $stderr.puts "\nFile: #{path}"
    $stderr.puts "Ruby syntax error in compiled Haml:"
    $stderr.puts e.message
    error_count += 1
    next
  end

  # Haml 7 defers certain errors (e.g. illegal nesting) into the compiled
  # Ruby source as `raise Haml::SyntaxError.new(...)` instead of failing at
  # parse time.  Detect those deferred errors by scanning the output.
  if compiled.include?("Haml::SyntaxError")
    if (match = compiled.match(/Haml::SyntaxError\.new\(%q\[(.+?)\]/))
      message = match[1]
    end
    if (line_match = compiled.match(/Haml::SyntaxError\.new\(%q\[.+?\],\s*(\d+)\)/))
      line = line_match[1]
    end

    $stderr.puts "\nFile: #{path}#{line ? ":#{line}" : ""}"
    $stderr.puts message || "Deferred Haml::SyntaxError detected in compiled output"
    error_count += 1
  end

  # --- Recommendations ---
  # Detect escaped class patterns that compile but produce incorrect HTML.
  source.each_line.with_index(1) do |line, lineno|
    SUSPECT_CLASS_PATTERNS.each do |pattern|
      next unless line.match?(pattern)

      $stderr.puts "\n[warning] File: #{path}:#{lineno}"
      $stderr.puts "  Escaped class in dot-notation produces incorrect HTML in Haml 7."
      $stderr.puts "  Use {class: \"...\"} attribute hash instead."
      $stderr.puts "  > #{line.strip}"
      warning_count += 1
    end
  end
end

if warning_count > 0
  $stderr.puts "\n#{warning_count} warning(s) found (do not cause build failure)"
end

exit(error_count.zero? ? 0 : 1)