#!/usr/bin/env ruby

require 'getoptlong'

require File.expand_path('../lib/nesta/commands', File.dirname(__FILE__))

module Nesta
  class Cli
    def self.usage(exitcode=1)
      puts <<EOF
USAGE: #{File.basename($0)} [GLOBAL OPTIONS] <command> [COMMAND OPTIONS]

GLOBAL OPTIONS
    --help, -h            Display this message.
    --version, -v         Display version number.
    --bash-completion     Output command completion setup for Bash.
    --zsh-completion      Output command completion setup for Zsh.

COMMANDS
    new <path>            Create a new Nesta project.
    edit <path>           Edit a document (path relative to content/pages).
    demo:content          Install example pages in ./content-demo.
    plugin:create <name>  Create a gem called nesta-plugin-name.
    theme:install <url>   Install a theme from a git repository.
    theme:enable <name>   Make the theme active, updating config.yml.
    theme:create <name>   Makes a template for a new theme in ./themes.

OPTIONS FOR new
    --git                 Create a new git repository for the project.
    --vlad                Include config/deploy.rb.

EOF
      exit exitcode
    end

    def self.version
      puts "Nesta #{Nesta::VERSION}"
      exit 0
    end

    def self.parse_command_line
      opts = GetoptLong.new(
        ['--bash-completion', GetoptLong::NO_ARGUMENT],
        ['--git', GetoptLong::NO_ARGUMENT],
        ['--help', '-h', GetoptLong::NO_ARGUMENT],
        ['--version', '-v', GetoptLong::NO_ARGUMENT],
        ['--vlad', GetoptLong::NO_ARGUMENT],
        ['--zsh-completion', GetoptLong::NO_ARGUMENT]
      )
      options = {}
      opts.each do |opt, arg|
        case opt
        when '--bash-completion'
          bash_completion
        when '--help'
          usage(exitcode=0)
        when '--version'
          version
        when '--zsh-completion'
          zsh_completion
        else
          options[opt.sub(/^--/, '')] = arg
        end
      end
      options
    rescue GetoptLong::InvalidOption => e
      $stderr.puts
      usage
    end

    def self.require_bundled_gems
      if File.exist?('Gemfile')
        require 'bundler'
        Bundler.setup(:default)
        Bundler.require(:default)
      end
    end

    def self.class_for_command(command)
      const_names = command.split(':').map { |word| word.capitalize }
      const_names.inject(Nesta::Commands) do |namespace, const|
        namespace.const_get(const)
      end
    end

    def self.main(options)
      command = ARGV.shift
      command.nil? && usage
      begin
        command_cls = class_for_command(command)
      rescue NameError
        usage
      else
        command_cls.new(ARGV[0], options).execute
      end
    rescue RuntimeError => e
      $stderr.puts "ERROR: #{e}"
      exit 1
    rescue Nesta::Commands::UsageError => e
      $stderr.puts "ERROR: #{e}"
      usage
    end

    def self.bash_completion
      puts <<-EOF
# Bash completion configuration for the nesta command.
#
# Install it with these commands:
#
# $ nesta --bash-completion > ~/.nesta-completion.sh
# $ echo '[ -f ~/.nesta-completion.sh ] && source ~/.nesta-completion.sh' \
#       >> ~/.bash_profile
# $ source ~/.nesta-completion.sh

_nesta() {
    local cur prev opts pages
    COMPREPLY=()
    cur="${COMP_WORDS[COMP_CWORD]}"
    prev="${COMP_WORDS[COMP_CWORD-1]}"

    opts="new 'demo:content' edit 'plugin:create' 'theme:install' 'theme:enable' 'theme:create'"

    case "${cur}" in
        theme:*)
            COMPREPLY=( $(compgen -W "enable install" -- ${cur##*:}) )
            return 0
            ;;
    esac

    case "${prev}" in
        edit)
            local pages_path="content/pages"
            local pages="$(find $pages_path -type f | sed s,$pages_path/,,)"
            COMPREPLY=( $(compgen -W "$pages" -- $cur) )
            return 0
            ;;
        *)
            ;;
    esac

    COMPREPLY=( $(compgen -W "$opts" -- $cur) )
    return 0
}
complete -F _nesta nesta
      EOF
      exit 0
    end

    def self.zsh_completion
      puts <<-EOF
# Zsh completion configuration for the nesta command.
#
# Install it with these commands:
#
# $ nesta --zsh-completion > <somewhere/in/your/$fpath>/nesta-completion.sh
#
# Source form somewhere in your $fpath

#compdef nesta


_nesta_content() {
  content=(`ls content/pages/**/*`)
}


local -a _1st_arguments
_1st_arguments=(
  'new:Create a new Nesta project'
  'edit:Edit a document'
  'demo\:content:Install example pages in ./content-demo'
  'theme\:install:Install a theme from a git repository'
  'theme\:enable:Make the theme active, updating config.yml'
  'theme\:create:Makes a template for a new theme in ./themes'
)

local expl
local -a content

_arguments \
  '(-h)'{-h,--help}'[Display usage]' \
  '(-v)'{-v,--version}'[Display Nesta version]' \
  '(--bash-completion)--bash-completion[Output command for Bash completion]' \
  '(--zsh-completion)--zsh-completion[Output command for Zsh completion]' \
  '*:: :->subcmds' && return 0

if (( CURRENT == 1 )); then
  _describe -t commands "nesta subcommand" _1st_arguments
  return
fi

case "$words[1]" in
  edit)
    _nesta_content
    _wanted content expl 'all content' compadd -a content ;;
esac
      EOF
      exit 0
    end
  end
end

Nesta::Cli.require_bundled_gems
Nesta::Plugin.initialize_plugins
Nesta::Cli.main(Nesta::Cli.parse_command_line)