#compdef yay

typeset -A opt_args
setopt extendedglob

# options for passing to _arguments: main pacman commands
_pacman_opts_commands=(
	{-D,--database}'[Modify database]'
	{-F,--files}'[Query the files database]'
	{-G,--getpkgbuild}'[Get PKGBUILD from ABS or AUR]'
	{-Q,--query}'[Query the package database]'
	{-R,--remove}'[Remove a package from the system]'
	{-S,--sync}'[Synchronize packages]'
	{-T,--deptest}'[Check if dependencies are installed]'
	{-U,--upgrade}'[Upgrade a package]'
	{-V,--version}'[Display version and exit]'
	'(-h --help)'{-h,--help}'[Display usage]'
)

# options for passing to _arguments: options common to all commands
_pacman_opts_common=(
	'--arch[Set an alternate architecture]'
	{-b,--dbpath}'[Alternate database location]:database_location:_files -/'
	'--color[colorize the output]:color options:(always never auto)'
	{-h,--help}'[Display syntax for the given operation]'
	{-r,--root}'[Set alternate installation root]:installation root:_files -/'
	{-v,--verbose}'[Be more verbose]'
	'--cachedir[Alternate package cache location]:cache_location:_files -/'
	'--config[An alternate configuration file]:config file:_files'
	'--confirm[Always ask for confirmation]'
	'--debug[Display debug messages]'
	'--gpgdir[Set an alternate directory for GnuPG (instead of /etc/pacman.d/gnupg)]: :_files -/'
	'--hookdir[Set an alternate hook location]: :_files -/'
	'--logfile[An alternate log file]:config file:_files'
	'--noconfirm[Do not ask for confirmation]'
	'--noprogressbar[Do not show a progress bar when downloading files]'
	'--noscriptlet[Do not execute the install scriptlet if one exists]'
	'--bottomup[Show AUR packages first]'
	'--topdown[Show repository packages first]'
)

# options for passing to _arguments: options for --upgrade commands
_pacman_opts_pkgfile=(
	'*-d[Skip dependency checks]'
	'*--nodeps[Skip dependency checks]'
	'*--assume-installed[Add virtual package to satisfy dependencies]'
	'--dbonly[Only remove database entry, do not remove files]'
	'--force[Overwrite conflicting files]'
	'--needed[Do not reinstall up to date packages]'
	'--asdeps[mark packages as non-explicitly installed]'
	'--asexplicit[mark packages as explicitly installed]'
	{-p,--print}'[Only print the targets instead of performing the operation]'
	'*--ignore[Ignore a package upgrade]:package: _pacman_completions_all_packages'
	'*--ignoregroup[Ignore a group upgrade]:package group:_pacman_completions_all_groups'
	'--print-format[Specify how the targets should be printed]'
	'*:package file:_files -g "*.pkg.tar*~*.sig(.,@)"'
)

# options for passing to _arguments: subactions for --query command
_pacman_opts_query_actions=(
	'(-Q --query)'{-Q,--query}
	{-g,--groups}'[View all members of a package group]:*:package groups:->query_group'
	{-o,--owns}'[Query the package that owns a file]:file:_files'
	{-p,--file}'[Package file to query]:*:package file:->query_file'
	{-s,--search}'[Search package names and descriptions]:*:search text:->query_search'
)

# options for passing to _arguments: options for --query and subcommands
_pacman_opts_query_modifiers=(
	{-c,--changelog}'[List package changelog]'
	{-d,--deps}'[List packages installed as dependencies]'
	{-e,--explicit}'[List packages explicitly installed]'
	{\*-i,\*--info}'[View package information]'
	{\*-k,\*--check}'[Check package files]'
	{-l,--list}'[List package contents]'
	{-m,--foreign}'[List installed packages not found in sync db(s)]'
	{-n,--native}'[List installed packages found in sync db(s)]'
	{-q,--quiet}'[Show less information for query and search]'
	{-t,--unrequired}'[List packages not required by any package]'
	{-u,--upgrades}'[List packages that can be upgraded]'
)

# options for passing to _arguments: options for --remove command
_pacman_opts_remove=(
	{-c,--cascade}'[Remove all dependent packages]'
	{-d,--nodeps}'[Skip dependency checks]'
	'*--assume-installed[Add virtual package to satisfy dependencies]'
	{-n,--nosave}'[Remove protected configuration files]'
	{-p,--print}'[Only print the targets instead of performing the operation]'
	{\*-s,\*--recursive}'[Remove dependencies not required by other packages]'
	{-u,--unneeded}'[Remove unneeded packages]'
	'--dbonly[Only remove database entry, do not remove files]'
	'--print-format[Specify how the targets should be printed]'
	'*:installed package:_pacman_completions_installed_packages'
)

_pacman_opts_database=(
	'--asdeps[mark packages as non-explicitly installed]'
	'--asexplicit[mark packages as explicitly installed]'
	'*:installed package:_pacman_completions_installed_packages'
)

_pacman_opts_files=(
	{-l,--list}'[List the files owned by the queried package]:package:_pacman_completions_all_packages'
	{-o,--owns}'[Query the package that owns]:files:_files'
	{-s,--search}'[Search package file names for matching strings]:files:_files'
	{-x,--regex}'[Enable searching using regluar expressions]:regex:'
	{-y,--refresh}'[Download fresh files databases from the server]'
	'--machinereadable[Produce machine-readable output]'
	{-q,--quiet}'[Show less information for query and search]'
)

# options for passing to _arguments: options for --sync command
_pacman_opts_sync_actions=(
	'(-S --sync)'{-S,--sync}
	{\*-c,\*--clean}'[Remove old packages from cache]:\*:clean:->sync_clean'
	{-g,--groups}'[View all members of a package group]:*:package groups:->sync_group'
	{-s,--search}'[Search package names and descriptions]:*:search text:->sync_search'
	'--dbonly[Only remove database entry, do not remove files]'
	'--needed[Do not reinstall up to date packages]'
	'--recursive[Reinstall all dependencies of target packages]'
)

# options for passing to _arguments: options for --sync command
_pacman_opts_sync_modifiers=(
	{\*-d,\*--nodeps}'[Skip dependency checks]'
	'*--assume-installed[Add virtual package to satisfy dependencies]'
	{\*-i,\*--info}'[View package information]'
	{-l,--list}'[List all packages in a repository]'
	{-p,--print}'[Print download URIs for each package to be installed]'
	{-q,--quiet}'[Show less information for query and search]'
	{\*-u,\*--sysupgrade}'[Upgrade all out-of-date packages]'
	{-w,--downloadonly}'[Download packages only]'
	{\*-y,\*--refresh}'[Download fresh package databases]'
	'*--ignore[Ignore a package upgrade]:package: _pacman_completions_all_packages'
	'*--ignoregroup[Ignore a group upgrade]:package group:_pacman_completions_all_groups'
	'--asdeps[Install packages as non-explicitly installed]'
	'--asexplicit[Install packages as explicitly installed]'
	'--force[Overwrite conflicting files]'
	'--print-format[Specify how the targets should be printed]'
)

# handles --help subcommand
_pacman_action_help() {
	_arguments -s : \
		"$_pacman_opts_commands[@]"
}

# handles cases where no subcommand has yet been given
_pacman_action_none() {
	_arguments -s : \
		"$_pacman_opts_commands[@]"
}

# handles --query subcommand
_pacman_action_query() {
	local context state line
	typeset -A opt_args

	case $state in
		query_file)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:package file:_files -g "*.pkg.tar*~*.sig(.,@)"'
			;;
		query_group)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:groups:_pacman_completions_installed_groups'
			;;
		query_owner)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:file:_files'
			;;
		query_search)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:search text: '
			;;
		*)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_actions[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:package:_pacman_completions_installed_packages'
			;;
	esac
}

# handles --remove subcommand
_pacman_action_remove() {
	_arguments -s : \
		'(--remove -R)'{-R,--remove} \
		"$_pacman_opts_common[@]" \
		"$_pacman_opts_remove[@]"
}

# handles --database subcommand
_pacman_action_database() {
	_arguments -s : \
		'(--database -D)'{-D,--database} \
		"$_pacman_opts_common[@]" \
		"$_pacman_opts_database[@]"
}

# handles --files subcommand
_pacman_action_files() {
	_arguments -s : \
		'(--files -F)'{-F,--files} \
		"$_pacman_opts_common[@]" \
		"$_pacman_opts_files[@]"
}

_pacman_action_deptest () {
	_arguments -s : \
		'(--deptest)-T' \
		"$_pacman_opts_common[@]" \
		":packages:_pacman_all_packages"
}


# handles --sync subcommand
_pacman_action_sync() {
	local context state line
	typeset -A opt_args
	if (( $+words[(r)--clean] )); then
		state=sync_clean
	elif (( $+words[(r)--groups] )); then
		state=sync_group
	elif (( $+words[(r)--search] )); then
		state=sync_search
	fi

	case $state in
		sync_clean)
			_arguments -s : \
				{\*-c,\*--clean}'[Remove old packages from cache]' \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]"
				;;
		sync_group)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'(-g --group)'{-g,--groups} \
				'*:package group:_pacman_completions_all_groups'
			;;
		sync_search)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'*:search text: '
			;;
		*)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_actions[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'*:package:_pacman_completions_all_packages'
			;;
	esac
}

# handles --upgrade subcommand
_pacman_action_upgrade() {
	_arguments -s : \
		'(-U --upgrade)'{-U,--upgrade} \
		"$_pacman_opts_common[@]" \
		"$_pacman_opts_pkgfile[@]"
}

# handles --version subcommand
_pacman_action_version() {
	# no further arguments
	return 0
}

# provides completions for package groups
_pacman_completions_all_groups() {
	local -a cmd groups
	_pacman_get_command
	groups=( $(_call_program groups $cmd[@] -Sg) )
	typeset -U groups

	if [[ ${words[CURRENT-1]} == '--ignoregroup' ]]; then
		_sequence compadd -S ',' "$@" -a groups
	else
		compadd "$@" -a groups
	fi
}

# provides completions for packages available from repositories
# these can be specified as either 'package' or 'repository/package'
_pacman_completions_all_packages() {
	local -a seq sep cmd packages repositories packages_long

	if [[ ${words[CURRENT-1]} == '--ignore' ]]; then
		seq='_sequence'
		sep=(-S ',')
	else
		seq=
		sep=()
	fi

	if compset -P1 '*/*'; then
		packages=( $(_call_program packages yay --complete zsh ${words[CURRENT]%/*}) )
		typeset -U packages
		${seq} _wanted repo_packages expl "repository/package" compadd ${sep[@]} ${(@)packages}
	else
		packages=( $(_call_program packages yay --complete zsh) )
		typeset -U packages
		${seq} _wanted packages expl "packages" compadd ${sep[@]} - "${(@)packages}"

		repositories=(${(o)${${${(M)${(f)"$(</etc/pacman.conf)"}:#\[*}/\[/}/\]/}:#options})
		typeset -U repositories
		_wanted repo_packages expl "repository/package" compadd -S "/" $repositories
	fi
}

# provides completions for package groups
_pacman_completions_installed_groups() {
	local -a cmd groups
	_pacman_get_command
	groups=(${(o)${(f)"$(_call_program groups $cmd[@] -Qg)"}% *})
	typeset -U groups
	compadd "$@" -a groups
}

# provides completions for installed packages
_pacman_completions_installed_packages() {
	local -a cmd packages packages_long
	packages_long=(/var/lib/pacman/local/*(/))
	packages=( ${${packages_long#/var/lib/pacman/local/}%-*-*} )
	compadd "$@" -a packages
}

_pacman_all_packages() {
	_alternative : \
		'localpkgs:local packages:_pacman_completions_installed_packages' \
		'repopkgs:repository packages:_pacman_completions_all_packages'
}

# provides completions for repository names
_pacman_completions_repositories() {
	local -a cmd repositories
	repositories=(${(o)${${${(M)${(f)"$(</etc/pacman.conf)"}:#\[*}/\[/}/\]/}:#options})
	# Uniq the array
	typeset -U repositories
	compadd "$@" -a repositories
}

# builds command for invoking pacman in a _call_program command - extracts
# relevant options already specified (config file, etc)
# $cmd must be declared by calling function
_pacman_get_command() {
	# this is mostly nicked from _perforce
	cmd=( "pacman" "2>/dev/null")
	integer i
	for (( i = 2; i < CURRENT - 1; i++ )); do
		if [[ ${words[i]} = "--config" || ${words[i]} = "--root" ]]; then
			cmd+=( ${words[i,i+1]} )
		fi
	done
}

# main dispatcher
_pacman_zsh_comp() {
	local -a args cmds;
	local tmp
	args=( ${${${(M)words:#-*}#-}:#-*} )
	for tmp in $words; do
		cmds+=("${${_pacman_opts_commands[(r)*$tmp\[*]%%\[*}#*\)}")
	done
	case $args in #$words[2] in
		h*)
			if (( ${(c)#args} <= 1 && ${(w)#cmds} <= 1 )); then
				_pacman_action_help
			else
				_message "no more arguments"
			fi
			;;
		*h*)
			_message "no more arguments"
			;;
		D*)
			_pacman_action_database
			;;
		F*)
			_pacman_action_files
			;;
		Q*g*) # ipkg groups
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:groups:_pacman_completions_installed_groups'
			;;
		Q*o*) # file
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:package file:_files'
			;;
		Q*p*) # file *.pkg.tar*
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_query_modifiers[@]" \
				'*:package file:_files -g "*.pkg.tar*~*.sig(.,@)"'
			;;
		T*)
			_pacman_action_deptest
			;;
		Q*)
			_pacman_action_query
			;;
		R*)
			_pacman_action_remove
			;;
		S*c*) # no completion
			_arguments -s : \
				'(-c --clean)'{\*-c,\*--clean}'[Remove all files from the cache]' \
				"$_pacman_opts_common[@]"
			;;
		S*l*) # repos
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'*:package repo:_pacman_completions_repositories' \
			;;
		S*g*) # pkg groups
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'*:package group:_pacman_completions_all_groups'
			;;
		S*s*)
			_arguments -s : \
				"$_pacman_opts_common[@]" \
				"$_pacman_opts_sync_modifiers[@]" \
				'*:search text: '
				;;
		S*)
			_pacman_action_sync
			;;
		T*)
			 _arguments -s : \
				'-T' \
				"$_pacman_opts_common[@]" \
				":packages:_pacman_all_packages"
			;;
		U*)
			_pacman_action_upgrade
			;;
		V*)
			_pacman_action_version
			;;
		*)

			case ${(M)words:#--*} in
				*--help*)
					if (( ${(w)#cmds} == 1 )); then
						_pacman_action_help
					else
						return 0;
					fi
					;;
				*--sync*)
					_pacman_action_sync
					;;
				*--query*)
					_pacman_action_query
					;;
				*--remove*)
					_pacman_action_remove
					;;
				*--deptest*)
					_pacman_action_deptest
					;;
				*--database*)
					_pacman_action_database
					;;
				*--files*)
					_pacman_action_files
					;;
				*--version*)
					_pacman_action_version
					;;
				*--upgrade*)
					_pacman_action_upgrade
					;;
				*)
					_pacman_action_none
					;;
			esac
			;;
	esac
}
_pacman_comp() {
	case "$service" in
		yay)
			_pacman_zsh_comp "$@"
			;;
		*)
			_message "Error"
			;;
	esac
}

_pacman_comp "$@"