# typed: true
# frozen_string_literal: true

require "cli/parser"

module Homebrew
  extend T::Sig

  sig { returns(CLI::Parser) }
  def self.log_args
    Homebrew::CLI::Parser.new do
      description <<~EOS
        Show the `git log` for <formula> or <cask>, or show the log for the Homebrew repository
        if no formula or cask is provided.
      EOS
      switch "-p", "-u", "--patch",
             description: "Also print patch from commit."
      switch "--stat",
             description: "Also print diffstat from commit."
      switch "--oneline",
             description: "Print only one line per commit."
      switch "-1",
             description: "Print only one commit."
      flag   "-n", "--max-count=",
             description: "Print only a specified number of commits."
      switch "--formula", "--formulae",
             description: "Treat all named arguments as formulae."
      switch "--cask", "--casks",
             description: "Treat all named arguments as casks."

      conflicts "-1", "--max-count"
      conflicts "--formula", "--cask"

      named_args [:formula, :cask], max: 1
    end
  end

  def self.log
    args = log_args.parse

    # As this command is simplifying user-run commands then let's just use a
    # user path, too.
    ENV["PATH"] = PATH.new(ORIGINAL_PATHS).to_s

    if args.no_named?
      git_log HOMEBREW_REPOSITORY, args: args
    else
      path = args.named.to_paths.first
      tap = Tap.from_path(path)
      git_log path.dirname, path, tap, args: args
    end
  end

  def self.git_log(cd_dir, path = nil, tap = nil, args:)
    cd cd_dir do
      repo = Utils.popen_read("git", "rev-parse", "--show-toplevel").chomp
      if tap
        name = tap.to_s
        git_cd = "$(brew --repo #{tap})"
      elsif cd_dir == HOMEBREW_REPOSITORY
        name = "Homebrew/brew"
        git_cd = "$(brew --repo)"
      else
        name, git_cd = cd_dir
      end

      if File.exist? "#{repo}/.git/shallow"
        opoo <<~EOS
          #{name} is a shallow clone so only partial output will be shown.
          To get a full clone, run:
            git -C "#{git_cd}" fetch --unshallow
        EOS
      end

      git_args = []
      git_args << "--patch" if args.patch?
      git_args << "--stat" if args.stat?
      git_args << "--oneline" if args.oneline?
      git_args << "-1" if args.public_send(:"1?")
      git_args << "--max-count" << args.max_count if args.max_count
      git_args += ["--follow", "--", path] if path.present?
      system "git", "log", *git_args
    end
  end
end