class Byebug::BreakCommand

def self.description
  <<-DESCRIPTION
    b[reak] [<file>:]<line> [if <expr>]
    b[reak] [<module>::...]<class>(.|#)<method> [if <expr>]
    They can be specified by line or method and an expression can be added
    for conditionally enabled breakpoints.
    #{short_description}
  DESCRIPTION
end

def self.regexp
  /^\s* b(?:reak)? (?:\s+ (.+?))? (?:\s+ if \s+(.+))? \s*$/x
end

def self.short_description
  "Sets breakpoints in the source code"
end

def add_line_breakpoint(file, line)
  raise(pr("break.errors.source", file: file)) unless File.exist?(file)
  fullpath = File.realpath(file)
  raise(pr("break.errors.far_line", lines: n_lines(file), file: fullpath)) if line > n_lines(file)
  unless Breakpoint.potential_line?(fullpath, line)
    msg = pr(
      "break.errors.line",
      file: fullpath,
      line: line,
      valid_breakpoints: valid_breakpoints_for(fullpath, line)
    )
    raise(msg)
  end
  Breakpoint.add(fullpath, line, @match[2])
end

def execute
  return puts(help) unless @match[1]
  b = line_breakpoint(@match[1]) || method_breakpoint(@match[1])
  return errmsg(pr("break.errors.location")) unless b
  return puts(pr("break.created", id: b.id, file: b.source, line: b.pos)) if syntax_valid?(@match[2])
  errmsg(pr("break.errors.expression", expr: @match[2]))
  b.enabled = false
end

def line_breakpoint(location)
  line_match = location.match(/^(\d+)$/)
  file_line_match = location.match(/^(.+):(\d+)$/)
  return unless line_match || file_line_match
  file = line_match ? frame.file : file_line_match[1]
  line = line_match ? line_match[1].to_i : file_line_match[2].to_i
  add_line_breakpoint(file, line)
end

def method_breakpoint(location)
  location.match(/([^.#]+)[.#](.+)/) do |match|
    klass = target_object(match[1])
    method = match[2].intern
    Breakpoint.add(klass, method, @match[2])
  end
end

def target_object(str)
  k = error_eval(str)
  k&.is_a?(Module) ? k.name : str
rescue StandardError
  errmsg("Warning: breakpoint source is not yet defined")
  str
end

def valid_breakpoints_for(path, line)
  potential_lines = Breakpoint.potential_lines(path)
  annotator = ->(n) { potential_lines.include?(n) ? "[B]" : "   " }
  source_file_formatter = SourceFileFormatter.new(path, annotator)
  source_file_formatter.lines_around(line).join.chomp
end