#!/bin/bash

SRC="$(realpath "${BASH_SOURCE%/*}/../")"

# Dummy function for successful source
function display_alert() { :; }
function enable_extension() { :; }
function add_packages_to_image() { :; }

function run_hook() {
	local hook_point="$1"
	while read -r hook_point_function; do
		"${hook_point_function}"
	done < <(compgen -A function | grep "^${hook_point}__" | LC_ALL=C.UTF-8 sort)
}

# $1: board config
function generate_for_board() {
	local board_config="$1"
	(
		BOARD="${board_config%.*}"
		source "${SRC}/config/boards/${board_config}"

		LINUXFAMILY="${BOARDFAMILY}"

		[[ -n "${BOARD_MAINTAINER}" ]] || return
		maintainers="$(echo "${BOARD_MAINTAINER}" | xargs -n1 | sed -E 's|^.+$|@\0|' | tr '\n' ' ')"

		while read -r BRANCH; do
			(
				source "${SRC}/config/sources/families/${LINUXFAMILY}.conf"
				source "${SRC}/config/sources/common.conf"
				source "${SRC}/config/sources/${ARCH}.conf"

				run_hook "post_family_config"
				run_hook "post_family_config_branch_${BRANCH,,}"

				[[ -z $LINUXCONFIG ]] && LINUXCONFIG="linux-${LINUXFAMILY}-${BRANCH}"
				[[ -z $KERNELPATCHDIR ]] && KERNELPATCHDIR="archive/${LINUXFAMILY}-${KERNEL_MAJOR_MINOR}"
				[[ -z $BOOTPATCHDIR ]] && BOOTPATCHDIR="u-boot-${LINUXFAMILY}"
				[[ -z $ATFPATCHDIR ]] && ATFPATCHDIR="atf-${LINUXFAMILY}"

				cat <<-EOF
					config/boards/${board_config}			${maintainers}
					config/kernel/${LINUXCONFIG%-*}-*.config	${maintainers}
					sources/families/${BOARDFAMILY}.conf		${maintainers}
					patch/kernel/${KERNELPATCHDIR%-*}-*/		${maintainers}
				EOF

				local patch_archive="$(readlink "patch/kernel/${KERNELPATCHDIR}" || true)"
				if [[ -n "${patch_archive}" ]]; then
					patch_archive="${patch_archive%/}"
					echo "patch/kernel/${patch_archive%-*}-*/	${maintainers}"
				fi

				if [[ -n "${BOOTCONFIG}" && "${BOOTCONFIG}" != "none" ]]; then
					while read -r d; do
						echo "patch/u-boot/${d}/		${maintainers}"
					done < <(echo "${BOOTPATCHDIR}" | xargs -n1)
				fi

				if [[ -n "${ATFSOURCE}" && "${ATFSOURCE}" != "none" ]]; then
					echo "patch/atf/${ATFPATCHDIR}/			${maintainers}"
				fi
			)
		done < <(echo "${KERNEL_TARGET}" | tr ',' '\n')
	)
}

function generate_for_all_board() {
	local board_config
	while read -r board_config; do
		local type="${board_config##*.}"
		[[ "conf wip csc eos tvb" == *"${type}"* ]] || continue

		generate_for_board "${board_config}"
	done < <(ls "${SRC}/config/boards/")
}

function merge() {
	local line
	declare -A codeowners
	while read -r line; do
		local file="$(echo "${line}" | tr -s '[:space:]' ' ' | cut -d' ' -f1)"
		local maintainers="$(echo "${line}" | tr -s '[:space:]' ' ' | cut -d' ' -f2-)"
		codeowners["$file"]+=" ${maintainers}"
	done

	local file
	while read -r file; do
		declare -a maintainers
		readarray -t maintainers < <(echo "${codeowners["$file"]}" | xargs -n1 | LC_ALL=C.UTF-8 sort -u)
		echo "${file}		${maintainers[*]}"
	done < <(printf "%s\n" "${!codeowners[@]}" | LC_ALL=C.UTF-8 sort)
}

cat <<-EOF >"${SRC}/.github/CODEOWNERS"
	# PLEASE DON'T EDIT THIS FILE
	# Auto generated by ".github/generate_CODEOWNERS.sh"

	# Default code owner
	*			@igorpecovnik

	# the last matching pattern takes the most

	*.md			@EvilOlaf @littlecxm @TheLinuxBug @TRSx80 @igorpecovnik
	
	.github/		@igorpecovnik @rpardini @hzyitc

	lib/			@armbian/build-scripts
	packages/		@armbian/build-scripts
	packages/bsp/jethub/	@armbian/build-scripts @adeepn
	tools/			@iav @neheb @hzyitc @mhoffrog

	# The following contents are generated by board configs
	$(generate_for_all_board | merge)
EOF