#!/usr/bin/env bash

#----------------------------------------------------------
# Repository:  https://github.com/iterative/dvc
#
# References:
#   - https://www.gnu.org/software/bash/manual/html_node/Programmable-Completion.html
#   - https://opensource.com/article/18/3/creating-bash-completion-script
#----------------------------------------------------------

_dvc_commands='add cache checkout commit config destroy diff fetch get-url get gc \
              import-url import init install lock metrics move pipeline pull push \
              remote remove repro root run status unlock unprotect version update'

_dvc_options='-h --help -V --version'
_dvc_global_options='-h --help -q --quiet -v --verbose'

_dvc_add='-R --recursive -f --file --no-commit $(compgen -G *)'
_dvc_cache=''
_dvc_checkout='-f --force -d --with-deps -R --recursive $(compgen -G *.dvc)'
_dvc_commit='-f --force -d --with-deps -R --recursive $(compgen -G *.dvc)'
_dvc_config='-u --unset --local --system --global'
_dvc_destroy='-f --force'
_dvc_diff='-t --target'
_dvc_fetch='--show-checksums -j --jobs -r --remote -a --all-branches -T --all-tags -d --with-deps -R --recursive $(compgen -G *.dvc)'
_dvc_get_url=''
_dvc_get='-o --out --rev'
_dvc_gc='-a --all-branches -T --all-tags -c --cloud -r --remote -f --force -p --projects -j --jobs'
_dvc_import_url='--resume -f --file'
_dvc_import='-o --out --rev'
_dvc_init='--no-scm -f --force'
_dvc_install=''
_dvc_lock='$(compgen -G *.dvc)'
_dvc_metrics=''
_dvc_move='$(compgen -G *)'
_dvc_pipeline=''
_dvc_pull='--show-checksums -j --jobs -r --remote -a --all-branches -T --all-tags -f --force -d --with-deps -R --recursive $(compgen -G *.dvc)'
_dvc_push='--show-checksums -j --jobs -r --remote -a --all-branches -T --all-tags -d --with-deps -R --recursive $(compgen -G *.dvc)'
_dvc_remote=''
_dvc_remove='-o --outs -p --purge -f --force $(compgen -G *.dvc)'
_dvc_repro='-f --force -s --single-item -c --cwd -m --metrics --dry -i --interactive -p --pipeline -P --all-pipelines --ignore-build-cache --no-commit -R --recursive --downstream $(compgen -G *.dvc)'
_dvc_root=''
_dvc_run='--no-exec -f --file -c --cwd -d --deps -o --outs -O --outs-no-cache --outs-persist --outs-persist-no-cache -m --metrics -M --metrics-no-cache -y --yes --overwrite-dvcfile --ignore-build-cache --remove-outs --no-commit -w --wdir'
_dvc_status='--show-checksums -j --jobs -r --remote -a --all-branches -T --all-tags -d --with-deps -c --cloud $(compgen -G *.dvc)'
_dvc_unlock='$(compgen -G *.dvc)'
_dvc_unprotect='$(compgen -G *)'
_dvc_version=''
_dvc_update='$(compgen -G *.dvc)'

# Notes:
#
# `COMPREPLY` contains what will be rendered after completion is triggered
#
# `word` refers to the current typed word
#
# `${!var}` is to evaluate the content of `var` and expand its content as a variable
#
#       hello="world"
#       x="hello"
#       ${!x} ->  ${hello} ->  "world"
#
_dvc () {
  local word="${COMP_WORDS[COMP_CWORD]}"

  COMPREPLY=()

  if [ "${COMP_CWORD}" -eq 1 ]; then
    case "$word" in
      -*) COMPREPLY=($(compgen -W "$_dvc_options" -- "$word")) ;;
      *)  COMPREPLY=($(compgen -W "$_dvc_commands" -- "$word")) ;;
    esac
  elif [ "${COMP_CWORD}" -eq 2 ]; then
    local options_list="_dvc_${COMP_WORDS[1]}"

    COMPREPLY=($(compgen -W "$_dvc_global_options ${!options_list}" -- "$word"))
  fi

  return 0
}

complete -F _dvc dvc