#!/usr/bin/env zsh
# vi: set expandtab ft=zsh tw=80 ts=2

runModule() {
  "$@"
}

function askNecessaryQuestions() {
  local mod= configOnlyArgs=()
  config setappname "de.astzweig.macos.system-setup"
  if [ -n "${config_only}" ]; then
    lop -- -d "Config only option given with value:" -d "${config_only}"
    config setconfigfile "${config_only}"
    configOnlyArgs=(-x)
  elif [ -n "${config}" ]; then
    config setconfigfile "${config}"
  fi
  askUserModuleQuestions ${configOnlyArgs} -c config -v moduleAnswers ${modulesToInstall}
}

function printModulesToInstall() {
  lop -- -d 'Modules that will install are:' -d "${modulesToInstall}"
  for mod in "${modulesToInstall[@]}"; do
    print "${mod}"
  done | abbreviatePaths
  exit 0
}

function generateModuleOptions() {
  local value answerKey optionKey
  for answerKey in ${(k)moduleAnswers}; do
    [[ ${answerKey} = ${mod}_* ]] || continue
    optionKey="${answerKey#${mod}_}"
    value="${moduleAnswers[${answerKey}]}"
    if [[ "${optionKey}" =~ ^[[:alpha:]]$ ]]; then
      moduleOptions+=("-${optionKey}" "${value}")
    elif [[ "${optionKey}" =~ ^[[:alpha:]][-[:alpha:]]+$ ]]; then
      moduleOptions+=("--${optionKey}" "${value}")
    else
      moduleOptions+=("${optionKey}" "${value}")
    fi
  done
}

function installModules() {
  local mod moduleOptions
  for mod in ${modulesToInstall}; do
    moduleOptions=()
    filteredOptions=()
    generateModuleOptions
    lop -- -d "Running ${mod}" -d "with ${#moduleOptions} args:" -d "${moduleOptions}"
    runModule ${mod} ${moduleOptions}
  done
}

function isMacOS() {
  autoload is-at-least
  [ "`uname -s`" = Darwin ] || return
  is-at-least "10.13" "`sw_vers -productVersion 2> /dev/null`"
}

function isPlistBuddyInstalled() {
  test -x /usr/libexec/PlistBuddy && return
  which PlistBuddy >&! /dev/null && return
}

function checkPrerequisites() {
  isMacOS || { lop -- -e 'This setup is only for macOS 10.13 and up.'; return 10 }
  isPlistBuddyInstalled || { lop -- -e 'This setup requires PlistBuddy to be either at /usr/libexec or in any of the PATH directories.'; return 11 }
  test "`id -u`" -eq 0 || { lop -- -e 'This module requires root access. Please run as root.'; return 11 }
}

function main() {
  autoloadZShLib || return
  checkPrerequisites || return
  eval "`docopts -f -V - -h - : "$@" <<- USAGE
	Usage: $0 [options] [-m PATH]... [<module>...]
	
	Install all modules in module search path. If any <module> arg is given,
	install only modules that either match any given <module> or whose path ends
	like any of the given <module>.
	
	Options:
	  -i, --inverse            Exclude the given <module> instead.
	  -m PATH, --modpath PATH  Include PATH in the module search path.
	  -c PATH, --config PATH   Read module answers from config file at PATH.
	  -l, --list               List modules that are going to be installed and
	                           exit without installation. Modules are printed in
	                           minimal but still distinct paths.
	  -d FILE, --logfile FILE  Print log message to logfile instead of stdout.
	  -v, --verbose            Be more verbose.
	  --config-only PATH       Ask module questions, generate config at PATH and
	                           exit. Useful for subsequent runs with c option.
	                           Any file at PATH will be overwritten.
	----
	$0 0.1.0
	Copyright (C) 2022 Rezart Qelibari, Astzweig GmbH & Co. KG
	License EUPL-1.2. There is NO WARRANTY, to the extent permitted by law.
	USAGE`"
  local allModules=() modulesToInstall=()
  local -A moduleAnswers
  configureLogging
  lop -- -d "Current working dir is: `pwd`"
  lop -- -d "Called main with $# args: $*"

  modpath+=("${_DIR}/modules")
  loadModules -v modulesToInstall ${$(echo -m):^^modpath} "${module[@]}"
  [ "${list}" = true ] && printModulesToInstall

  askNecessaryQuestions
  [ -z "${config_only}" ] || return 0
  installModules
}

if [[ "${ZSH_EVAL_CONTEXT}" == toplevel ]]; then
  _DIR="${0:A:h}"
  export ASTZWEIG_MACOS_SYSTEM_LIB=${_DIR}/modules/lib.sh
  export ASTZWEIG_ZSHLIB=${_DIR}/zshlib
  source "${ASTZWEIG_MACOS_SYSTEM_LIB}"
  main "$@"
fi