#!/usr/bin/env bash

set -u

# Following variables should be set in environment outside of this script.
# Build updated packages.
: "${BUILD_PACKAGES:=false}"
# Github Action create issue for failed updates.
: "${CREATE_ISSUE:=false}"
# Commit changes to Git.
: "${GIT_COMMIT_PACKAGES:=false}"
# Push changes to remote.
: "${GIT_PUSH_PACKAGES:=false}"

: "${TERMUX_ARCH:="aarch64"}"

export TERMUX_PKG_UPDATE_METHOD=""             # Which method to use for updating? (repology, github or gitlab)
export TERMUX_PKG_UPDATE_TAG_TYPE=""           # Whether to use latest-release-tag, latest-regex or newest-tag.
export TERMUX_PKG_AUTO_UPDATE=false            # Whether to auto-update or not. Disabled by default.
export TERMUX_PKG_UPDATE_VERSION_REGEXP=""     # Regexp to extract version with `grep -oP`.
export TERMUX_PKG_UPDATE_VERSION_SED_REGEXP="" # Regexp to extract version with `sed`.
export TERMUX_REPOLOGY_DATA_FILE
# Clean up any old repology data files
rm "${TMPDIR:-/tmp}/termux-repology".* &> /dev/null
TERMUX_REPOLOGY_DATA_FILE="$(mktemp -t termux-repology.XXXXXX)" # File to store repology data.

export TERMUX_SCRIPTDIR
TERMUX_SCRIPTDIR=$(realpath "$(dirname "$0")/../..") # Root of repository.

export TERMUX_PACKAGES_DIRECTORIES
TERMUX_PACKAGES_DIRECTORIES=$(jq --raw-output 'del(.pkg_format) | keys | .[]' "${TERMUX_SCRIPTDIR}"/repo.json)

# Define few more variables used by scripts.
# shellcheck source=scripts/properties.sh
. "${TERMUX_SCRIPTDIR}/scripts/properties.sh"

# Utility function to write error message to stderr.
# shellcheck source=scripts/build/termux_error_exit.sh
. "${TERMUX_SCRIPTDIR}/scripts/build/termux_error_exit.sh"

# Utility function to write updated version to build.sh.
# shellcheck source=scripts/updates/utils/termux_pkg_upgrade_version.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/utils/termux_pkg_upgrade_version.sh

# Utility function to check if package needs to be updated, based on version comparison.
# shellcheck source=scripts/updates/utils/termux_pkg_is_update_needed.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/utils/termux_pkg_is_update_needed.sh

# Wrapper around github api to get latest release or newest tag.
# shellcheck source=scripts/updates/api/termux_github_api_get_tag.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/api/termux_github_api_get_tag.sh

# Wrapper around gitlab api to get latest release or newest tag.
# shellcheck source=scripts/updates/api/termux_gitlab_api_get_tag.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/api/termux_gitlab_api_get_tag.sh

# Function to get latest version of a package as per repology.
# shellcheck source=scripts/updates/api/termux_repology_api_get_latest_version.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/api/termux_repology_api_get_latest_version.sh

# Default auto update script for packages hosted on github.com. Should not be overrided by build.sh.
# To use custom algorithm, one should override termux_pkg_auto_update().
# shellcheck source=scripts/updates/internal/termux_github_auto_update.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/internal/termux_github_auto_update.sh

# Default auto update script for packages hosted on hosts using gitlab-ci. Should not be overrided by build.sh.
# To use custom algorithm, one should override termux_pkg_auto_update().
# shellcheck source=scripts/updates/internal/termux_gitlab_auto_update.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/internal/termux_gitlab_auto_update.sh

# Default auto update script for rest packages. Should not be overrided by build.sh.
# To use custom algorithm, one should override termux_pkg_auto_update().
# shellcheck source=scripts/updates/internal/termux_repology_auto_update.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/internal/termux_repology_auto_update.sh

# shellcheck source=scripts/updates/internal/termux_github_graphql.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/internal/termux_github_graphql.sh

# Main script to:
# - by default, decide which update method to use,
# - but can be overridden by build.sh to use custom update method.
# - For example: see cmake's build.sh.
# shellcheck source=scripts/updates/termux_pkg_auto_update.sh
. "${TERMUX_SCRIPTDIR}"/scripts/updates/termux_pkg_auto_update.sh

# Converts milliseconds to human-readable format.
# Example: `ms_to_human_readable 123456789` => 34h 17m 36s 789ms
ms_to_human_readable() {
	local t="$1" hrs=0 mins=0 secs=0 ms=0
	(( ms = t%1000, t /= 1000, secs = t%60, t /= 60, mins = t%60, hrs = t/60 ))
	echo "${hrs}h ${mins}m ${secs}s ${ms}ms" | sed 's/0h //;s/0m //;s/0s //'
}

# Runs a command without displaying its output in the case if trace is disabled and displays output in the case if it is enabled.
# Needed only for debugging
quiet() {
	if [[ "$-" == *"x"* ]]; then
		"$@"
	else
		"$@" &> /dev/null
	fi
	return $?
}

_update() {
	export TERMUX_PKG_NAME
	TERMUX_PKG_NAME="$(basename "$1")"
	export TERMUX_PKG_BUILDER_DIR
	TERMUX_PKG_BUILDER_DIR="$(realpath "$1")" # Directory containing build.sh.

	IFS="," read -r -a EXCLUDED_ARCH <<< "${TERMUX_PKG_EXCLUDED_ARCHES:-}"
	export TERMUX_ARCH="" # Arch to test updates.
	for arch in aarch64 arm i686 x86_64; do
		if [[ " ${EXCLUDED_ARCH[*]} " != *" ${arch} "* ]]; then
			TERMUX_ARCH="${arch}"
			break
		fi
	done
	# Set +e +u to avoid:
	# - ending on errors such as $(which prog), where prog is not installed.
	# - error on unbound variable. (All global variables used should be covered by properties.sh and above.)
	set +e +u
	# shellcheck source=/dev/null
	. "${TERMUX_PKG_BUILDER_DIR}"/build.sh 2>/dev/null
	set -e -u

	echo # Newline.
	echo "INFO: Updating ${TERMUX_PKG_NAME} [Current version: ${TERMUX_PKG_VERSION}]"
	# Throw FD 3 into the FIFO for reporting
	exec {IPC_FIFO_FD}<>"$IPC_FIFO"
	termux_pkg_auto_update 3>& "${IPC_FIFO_FD}"
	exec {IPC_FIFO_FD}>&-
}

declare -A _LATEST_TAGS=()
declare -A _FAILED_UPDATES=()
declare -A _ALREADY_SEEN=() # Array of successful or packages and their old/new version.

# _fetch_and_cache_tags fetches all possible tags using termux_pkg_auto_update, but using Ninja build system.
# The key difference is that we make the process concurrent, allowing us to fetch tags simultaneously rather than one at a time.
# Once all tags are cached, the termux_pkg_auto_update function will operate much more quickly.
# We avoid packages with overwritten termux_pkg_auto_update to prevent unexpected modifications to the package`s build.sh.
# shellcheck disable=SC2015
_fetch_and_cache_tags() {
	echo "INFO: Fetching and caching tags"

	local __PACKAGES=()
	local __GITHUB_PACKAGES=()

	# Find all packages to be processed that don't have custom termux_pkg_auto_update() functions
	local pkg_dir
	for pkg_dir in "$@"; do
		# Skip packages with custom termux_pkg_auto_update() functions
		if [[ "$(<"$pkg_dir/build.sh")" =~ ^termux_pkg_auto_update ]]; then
			continue
		fi

		BUILD_PACKAGES=false quiet _should_update "${pkg_dir}" || continue # Skip if not needed.
		__PACKAGES+=("${pkg_dir}")

		# bash-builtin version of `grep '^TERMUX_PKG_SRCURL=' "${pkg_dir}/build.sh" | grep -q 'github.com'` without spawning extra processes
		if [[ "$(<"$pkg_dir/build.sh")" =~ TERMUX_PKG_SRCURL=[^[:space:]]*github\.com ]] &&
			[[ "$(<"$pkg_dir/build.sh")" =~ TERMUX_PKG_UPDATE_METHOD=[^[:space:]]*github || ! "$(<"$pkg_dir/build.sh")" =~ TERMUX_PKG_UPDATE_METHOD=[^[:space:]]* ]]; then
			__GITHUB_PACKAGES+=("$pkg_dir")
		fi
	done

	echo "INFO: Building GraphQL queries"

	local GITHUB_GRAPHQL_QUERIES=() COUNTER=0
	declare -A __GITHUB_GRAPHQL_PACKAGES=()
	# Ignore non-constant sources
	# shellcheck disable=SC1091
	for pkg_dir in "${__GITHUB_PACKAGES[@]}"; do
		local PKG_SRCURL="" TAG_TYPE="" REGEXP=""
		read -r PKG_SRCURL TAG_TYPE REGEXP < <(
			set +eu
			source "${pkg_dir}/build.sh"
			echo "${TERMUX_PKG_SRCURL}" "${TERMUX_PKG_UPDATE_TAG_TYPE:-"none"}" "${TERMUX_PKG_UPDATE_VERSION_REGEXP:-}"
		)

		local user="" repo=""
		IFS=/ read -r user repo _ <<< "${PKG_SRCURL#*://github.com/}"

		if [[ "${TAG_TYPE}" == "none" ]]; then # If not set, then decide on the basis of url.
			if [[ "${PKG_SRCURL:0:4}" == "git+" ]]; then
				TAG_TYPE="newest-tag" # Get newest tag.
			elif [[ -n "$REGEXP" ]]; then
				TAG_TYPE="latest-regex" # Get the latest release tag.
			else
				TAG_TYPE="latest-release-tag" # Get the latest release tag.
			fi
		fi

		# We prepare the query snippets for `termux_github_graphql` here
		# since we already have the needed information available.
		GITHUB_GRAPHQL_QUERIES+=( "_$((COUNTER++)): repository(owner: \\\"${user}\\\", name: \\\"${repo}\\\") { ..._${TAG_TYPE//-/_} }" )
	done

	# This is called indirectly in subshell
	# So silence shellcheck's unreachable code warning
	# shellcheck disable=SC2329
	__main__() {
		cd "${TERMUX_SCRIPTDIR}"
		export TERMUX_PKG_NAME="${1##*/}" TERMUX_PKG_BUILDER_DIR=${1}
		set +eu
		for i in scripts/updates/{**/,}*.sh "${1}/build.sh"; do
			# shellcheck disable=SC1090
			source "${i}"
		done
		set -eu

		# PKG means regular version to be cached normally.
		# SKIP means we know package is up to date and we can safely skip checks.
		# LOCAL is for obtaining current package version, to be compared with version obtained with GraphQL

		termux_github_api_get_tag() {
			local ver="${TERMUX_PKG_VERSION#*:}"
			echo "LOCAL|${TERMUX_PKG_NAME}|${ver}"
			exit 0
		}
		termux_pkg_upgrade_version() {
			local action; action="$( [[ "${1:-}" == "${TERMUX_PKG_VERSION#*:}" ]] && echo SKIP || echo PKG )"
			[[ "${1:-}" == "LOCAL|"* ]] && { echo "$1"; exit 0; } # Forwarded from termux_github_api_get_tag
			[[ -n "$1" ]] && echo "${action}|${TERMUX_PKG_NAME}|${1#*:}"
			exit 0
		}
		termux_repology_auto_update() {
			local ver; ver="$(termux_repology_api_get_latest_version "${TERMUX_PKG_NAME}")"
			if [[ "${ver}" == "null" ]]; then
				# it returns `null` in the case if the version is up to date so we can safely skip the package
				echo "SKIP|${TERMUX_PKG_NAME}|${TERMUX_PKG_VERSION#*:}"
			else
				# The package needs to be updated
				echo "PKG|${TERMUX_PKG_NAME}|${ver}"
			fi
			exit 0
		}
		termux_pkg_auto_update
	}

	echo "$([[ "${CI-false}" == "true" ]] && echo "::group::" || :)INFO: Fetching GitHub packages via GraphQL API"

	local line
	local -a LATEST_TAGS=() LATEST_TAGS_GITHUB=()

	while IFS='' read -r line; do
		case "$line" in
			# The entries can be single or multi-line
			# but each new entry starts with 'GIT|'
			'GIT|'*) LATEST_TAGS_GITHUB+=("$line");;
			# If the line didn't start a new entry, append it to the previous entry.
			*)       LATEST_TAGS_GITHUB[-1]+=$'\n'"$line";;
		esac
	done < <(termux_github_graphql "${GITHUB_GRAPHQL_QUERIES[@]}")

	[[ "${CI-false}" == "true" ]] && echo "::endgroup::" || :

	echo "INFO: Fetching non-GitHub packages"
	while read -r line; do
		case "$line" in
			# The entries can be single or multi-line
			# but each new entry starts with 'GIT|'
			'LOCAL|'*|'SKIP|'*|'PKG|'*) LATEST_TAGS+=("$line");;
			# If the line didn't start a new entry, append it to the previous entry.
			*)       LATEST_TAGS[-1]+=$'\n'"$line";;
		esac
		# Provide a running tally for local runs.
		# Don't do this in the CI since that would spam the logs
		[[ -z "${CI:-}" ]] && printf '\rINFO: Caching tags - %s' "${#LATEST_TAGS[*]}"
	done < <(
		export -f __main__
		export TERMUX_SCRIPTDIR GITHUB_TOKEN TERMUX_REPOLOGY_DATA_FILE
		printf '%s\0' "${__PACKAGES[@]}" | xargs -0 -n1 -P"$(nproc)" bash -c '__main__ "$@"' _
	)
	# make sure the running tally gets a proper newline on local runs
	[[ -z "${CI:-}" ]] && echo

	unset -f __main__

	local -A __GITHUB_CURRENT_TAGS=()
	[[ "${CI-false}" == "true" ]] && echo "::group::INFO: Skipping the following up-to-date packages" || :
	local pkg pkg_type pkg_name pkg_version
	for pkg in "${LATEST_TAGS[@]}" "${LATEST_TAGS_GITHUB[@]}"; do
		# local -
		# PS4='+$0 \[\e[32m\]${FUNCNAME[0]:-<global scope>}${FUNCNAME[*]:+()}:$LINENO\[\e[0m\] '; set -x

		pkg_type="${pkg%%|*}"
		pkg_name="${pkg#*|}"; pkg_name="${pkg_name%|*}"
		pkg_version="${pkg##*|}"
		case "${pkg_type}" in
			"LOCAL") # Local package version for a GitHub GraphQL request.
				__GITHUB_CURRENT_TAGS["${pkg_name:-_}"]="$pkg_version"
				continue
			;;
			"GIT") # GitHub GraphQL results, can be skipped if it matches the local version.
				if [[ "${__GITHUB_CURRENT_TAGS["${pkg_name:-}"]:-}" == "${pkg_version}" ]]; then
					echo "INFO: Skipping ${pkg_name}: already at version ${pkg_version}"
					: "${_ALREADY_SEEN["${pkg_name}"]:=""}"
				fi
			;;
			"SKIP") # SKIP means we know package is up to date and we can safely skip checks.
				: "${_ALREADY_SEEN["${pkg_name}"]:=""}"
				echo "INFO: Skipping ${pkg_name}: already at version ${pkg_version}"
			;;
		esac
		_LATEST_TAGS["${pkg_name:-_}"]="$pkg_version"
	done

	[[ "${CI-false}" == "true" ]] && echo "::endgroup::" || :

	# Sum up results
	echo "INFO: Fetched ${#LATEST_TAGS[*]} tags."
	echo "INFO: GitHub - ${#LATEST_TAGS_GITHUB[*]}"
	echo "INFO: Other  - $(( ${#LATEST_TAGS[*]} - ${#LATEST_TAGS_GITHUB[*]} ))"
	echo "INFO: Cached - ${#_ALREADY_SEEN[*]}"
}

_check_updated() {
	local latest_tag="${_LATEST_TAGS[${1##*/}]:-}"

	if [[ -z "${latest_tag}" ]]; then
		return 1
	fi

	(
	set +eu
	quiet source "${1}/build.sh"
	TERMUX_PKG_NAME="${1##*/}"
	export TERMUX_PKG_UPGRADE_VERSION_DRY_RUN=1
	# The call to `termux_pkg_upgrade_version` is delibrately
	# not wrapped by `quiet` to let warnings on stderr bubble up.
	if termux_pkg_upgrade_version "${latest_tag}" > /dev/null; then
		echo "INFO: Skipping ${1##*/}: already at version ${TERMUX_PKG_VERSION}"
		: "${_ALREADY_SEEN["${TERMUX_PKG_NAME}"]:=""}"
		return 0
	fi
	return 1
	)
}

declare -A _CACHED_ISSUES=()
# Check if an issue with same title already exists and is open.
_gh_check_issue_exists() {
	local pkg_name="$1" number

	# Check the cache.
	for number in "${!_CACHED_ISSUES[@]}"; do
		# shellcheck disable=SC2076 # We want literal match here, not regex based.
		if [[ "${_CACHED_ISSUES[$number]}" =~ "'Auto update failing for ${pkg_name}'" ]]; then
				echo "$number"
				return 0
		fi
	done
	return 1
}

_run_update() {
	local pkg_dir="$1" pkg_name
	pkg_name="$(basename "${pkg_dir}")"
	# needed for 'termux_pkg_is_update_needed'
	export TERMUX_PKG_NAME="${pkg_name}"
	# Run each package update in separate process since we include their environment variables.
	local output="" _CURRENT_VERSION _NEWEST_VERSION _ISSUE
	# shellcheck disable=SC1091 # Ignore shellcheck's inability to follow the source
	_CURRENT_VERSION="$(set +eu; . "$(realpath "$pkg_dir")/build.sh"; echo "${TERMUX_PKG_VERSION#*:}")"

	if output="$(
		set -euo pipefail
		# Pass cached tag we obtained earlier
		[[ -n "${_LATEST_TAGS[${pkg_name}]:-}" ]] && export __CACHED_TAG="${_LATEST_TAGS[${pkg_name}]}" || :
		exec > >(tee /dev/fd/2) 2>&1 # output everything on stderr to stdout as well.
		_update "${pkg_dir}"
	)"; then
		# For whatever reason reads from the FIFO are not instant even if there is data.
		# So put a 1ms timeout on it that way it doesn't wait infinitely if there's nothing in the FIFO,
		# since it only receives new data if `termux_pkg_upgrade_version()` ran.
		read -rt0.001 _NEWEST_VERSION < "$IPC_FIFO"
		# If we didn't get a version back treat it as current.
		# This mainly happens when Repology doesn't report a newer version for a package.
		# Which is returned as `null` in the API response, and which we treat as a skip.
		# See: scripts/updates/internal/termux_repology_auto_update.sh
		: "${_NEWEST_VERSION:="${_CURRENT_VERSION}"}"

		# Check associated issues if able.
		if (( ${#_CACHED_ISSUES[*]} )); then
			_ISSUE="$(_gh_check_issue_exists "${pkg_name}")"
		fi

		if termux_pkg_is_update_needed "${_CURRENT_VERSION}" "${_NEWEST_VERSION}"; then
			_ALREADY_SEEN["$pkg_name"]="${pkg_name} ${_CURRENT_VERSION} => ${_NEWEST_VERSION}${_ISSUE:+" - Open issue: #${_ISSUE}"}"
		elif termux_pkg_is_update_needed "${_NEWEST_VERSION}" "${_CURRENT_VERSION}"; then
			_ALREADY_SEEN["$pkg_name"]="${pkg_name} ${_CURRENT_VERSION} => ${_NEWEST_VERSION}${_ISSUE:+" - Open issue: #${_ISSUE}"} (Error? current version is larger than latest fetched version)"
		else
			_ALREADY_SEEN["$pkg_name"]=""
		fi
	else
		_FAILED_UPDATES["$pkg_name"]="${output}"
	fi
}

_should_update() {
	local pkg_dir="$1"

	if [[ ! -f "${pkg_dir}/build.sh" ]]; then
		# Fail if detected a non-package directory.
		termux_error_exit "directory '${pkg_dir}' is not a package."
	fi

	# `[[ "$(<"$file")" =~ regex ]]` is bash builtin solution for `grep -q` without spawning extra process
	# it is needed to pre-fetch and filter packages as fast as possible (it is 6.5 times faster than `grep`)
	case "${PACKAGES_OPT_OUT:-}" in
		"true") [[ $'\n'"$(<"$pkg_dir/build.sh")"$'\n' != *$'\n'TERMUX_PKG_AUTO_UPDATE=false$'\n'* ]] || return 1 ;; # Skip.
			*) [[ $'\n'"$(<"$pkg_dir/build.sh")"$'\n' == *$'\n'TERMUX_PKG_AUTO_UPDATE=true$'\n'* ]] || return 1 ;; # Skip.
	esac

	if [[ " ${!_ALREADY_SEEN[*]} ${!_FAILED_UPDATES[*]} " == *" ${pkg_dir##*/} "* ]]; then
		return 1 # Skip.
	fi

	local _ISSUE
	if [[ "${BUILD_PACKAGES}${GITHUB_ACTIONS:-}" == "truetrue" ]] && _ISSUE="$(_gh_check_issue_exists "${pkg_dir##*/}")"; then
		echo "INFO: Skipping '${pkg_dir##*/}', an update issue (#${_ISSUE}) for it hasn't been resolved yet."
		return 1
	fi

	return 0
}

shopt -s extglob
_update_dependencies() {
	local pkg_dir="$1"

	if ! grep -qE "^(TERMUX_PKG_DEPENDS|TERMUX_PKG_BUILD_DEPENDS|TERMUX_SUBPKG_DEPENDS)=" \
		"${pkg_dir}"/+(build|*.subpackage).sh; then
		return 0
	fi
	# shellcheck disable=SC2086 # Allow splitting of TERMUX_PACKAGES_DIRECTORIES.
	while read -r dep dep_dir; do
		if [[ -z "${dep}" ]]; then
			continue
		elif [[ "${dep}" == "ERROR" ]]; then
			termux_error_exit "Obtaining update order failed for ${pkg_dir##*/}"
		fi
		_should_update "${dep_dir}" && ! _check_updated "${dep_dir}" && _run_update "${dep_dir}"
	done < <("${TERMUX_SCRIPTDIR}"/scripts/buildorder.py "${pkg_dir}" $TERMUX_PACKAGES_DIRECTORIES || echo "ERROR")
}

echo "INFO: Running updates for: $*"

# If we have `gh` and a GitHub token,
# cache the open auto-update issues for `_gh_check_issue_exists`
if [[ -n "$GITHUB_TOKEN" ]] && command -v gh &> /dev/null; then
	_start_time="$(date +%10s%3N)"

	while read -r number title; do
		_CACHED_ISSUES["$number"]="'${title}'" # An extra quote ('') is added to avoid false positive matches.
	done < <(
		gh issue list \
			--limit 10000 \
			--label "auto update failing" --label "bot" \
			--state open \
			--search "Auto update failing for in:title type:issue" \
			--json number,title | jq -r '.[] | "\(.number) \(.title)"' | sort | uniq
	)
	printf "Cached %s existing issues - took %s\n" \
		"${#_CACHED_ISSUES[*]}" \
		"$(ms_to_human_readable $(( $(date +%10s%3N) - _start_time )))"
fi
_start_time="$(date +%10s%3N)"

# Remove any leftover FIFOs that may not have been cleaned up.
rm "${TMPDIR:-/tmp}/termux_ipc_"*.fifo &> /dev/null
# Set up a side channel FIFO for reporting parsed latest versions
export IPC_FIFO="${TMPDIR:-/tmp}/termux_ipc_$$.fifo"
mkfifo "$IPC_FIFO"
exec {IPC_FIFO_FD}<>"$IPC_FIFO"

# If the dependencies for the 'dump-repology-data' script are not yet present,
# create a venv, activate the venv, and install them in the venv before running the
# 'dump-repology-data' script
if ! python3 -c "import requests" 2>/dev/null; then
	dump_repology_data_venv_dir="$(mktemp -d)"
	python3 -m venv --system-site-packages "$dump_repology_data_venv_dir"
	source "$dump_repology_data_venv_dir/bin/activate"
	echo "INFO: Installing the dependencies of the 'dump-repology-data' script"
	pip3 install requests
fi
echo "INFO: Running the 'dump-repology-data' script"
if python3 "${TERMUX_SCRIPTDIR}"/scripts/updates/api/dump-repology-data "${TERMUX_REPOLOGY_DATA_FILE}"; then
	echo "INFO: The 'dump-repology-data' script was successful"
else
	echo "INFO: The 'dump-repology-data' script was unsuccessful, so an empty json is being placed in \${TERMUX_REPOLOGY_DATA_FILE}"
	echo "{}" > "${TERMUX_REPOLOGY_DATA_FILE}"
fi

if [[ "$1" == "@all" ]]; then
	declare -a PACKAGE_LIST=()
	for channel in $(jq --raw-output 'del(.pkg_format) | keys | .[]' "${TERMUX_SCRIPTDIR}/repo.json"); do
		for pkg_dir in "${channel}"/*; do
			PACKAGE_LIST+=("$pkg_dir")
		done
	done
	set -- "${PACKAGE_LIST[@]}"
	unset PACKAGE_LIST
fi

declare -a PACKAGE_DIRS_LIST=()
for pkg in "$@"; do
	pkg_dir="${pkg}"
	if [[ ! -d "${pkg}" ]]; then # If only package name is given, try to find its directory.
		for channel in $(jq --raw-output 'del(.pkg_format) | keys | .[]' "${TERMUX_SCRIPTDIR}/repo.json"); do
			if [[ -d "${channel}/${pkg}" ]]; then
				pkg_dir="${channel}/${pkg}"
				break
			fi
		done
	fi
	PACKAGE_DIRS_LIST+=("$pkg_dir")
done

# To conserve API limits and speed up update checking,
# pre-cache the latest tags
_fetch_and_cache_tags "${PACKAGE_DIRS_LIST[@]}"

for pkg_dir in "${PACKAGE_DIRS_LIST[@]}"; do
	_unix_millis="$(date +%10s%3N)"
	# eliminate packages without updates
	# when it is possible to determine that from the API response alone.
	# Check if we should be updating this package.
	# Skip it if:
	# - it doesn't have auto-updates enabled
	# - it was already cached by _fetch_and_cache_tags
	# - or there is an open auto-update issue for it
	_should_update "${pkg_dir}" || continue
	_update_dependencies "${pkg_dir}"
	_run_update "${pkg_dir}"
	echo "termux - took $(ms_to_human_readable $(( $(date +%10s%3N) - _unix_millis )))"
done

exec {IPC_FIFO_FD}<&- # close the FIFO
# Clean up our FIFO and repology data file
rm "$IPC_FIFO" "$TERMUX_REPOLOGY_DATA_FILE"

#################################################REPORT CHANGES##################################################

total="${#_ALREADY_SEEN[*]}"
direct="$#"
indirect="$(( total - direct ))"

echo ""
echo "SUMMARY: Checked ${total} packages - took $(ms_to_human_readable $(( $(date +%10s%3N) - _start_time ))) in total."
echo "SUMMARY: ${direct} (Directly passed), ${indirect} (Dependencies)"
echo ""
echo "=================================================="
echo ""
echo "SUMMARY: Detected updates"
printf '%s\n' "${_ALREADY_SEEN[@]}" | grep -ve '^$' | sort
echo ""
echo "SUMMARY: ${#_FAILED_UPDATES[*]} failed updates."
echo "${!_FAILED_UPDATES[@]}"

unset IPC_FIFO IPC_FIFO_FD _unix_millis _start_time _pkg total direct indirect

################################################FAILURE HANDLING#################################################

_gh_create_new_issue() {
	local pkg_name="$1"
	local max_body_length=65536 # Max length of the body for one request.
	local issue_number
	local body
	local link
	local assignee=""
	[[ "${GITHUB_ACTOR:-termuxbot2}" != "termuxbot2" ]] && assignee="--assignee $GITHUB_ACTOR"

	if [[ "${CREATE_ISSUE}" != "true" ]]; then
		echo "INFO: CREATE_ISSUE set to '${CREATE_ISSUE}'. Not creating new issue."
		return 1
	fi
	if _gh_check_issue_exists "${pkg_name}"; then
		echo "INFO: An existing update issue for '${pkg_name}' hasn't been resolved yet."
		return
	fi

	# Extract origin URL, commit hash and builder directory and put everything together
	link="$(git config --get remote.origin.url | sed -E 's|\.git$||; s|git@([^:]+):(.+)|https://\1/\2|')/blob/$(git rev-parse HEAD)/$(echo */"$1")"

	body="$(
		cat <<-EOF
			Hi, I'm Termux 🤖.

			I'm here to help you update your Termux packages.

			I've tried to update the [${pkg_name}](${link}) package, but it failed.

			Here's the output of the update script:
			<details>
				<summary>Show log</summary>
				<pre lang="console">${_FAILED_UPDATES["${pkg_name}"]}</pre>
			</details>

			<hr>
			<i>
			Above error occurred when I last tried to update at $(date -u +"%Y-%m-%d %H:%M:%S UTC").<br>
			Run ID: <a href="${GITHUB_SERVER_URL}/${GITHUB_REPOSITORY}/actions/runs/${GITHUB_RUN_ID}">${GITHUB_RUN_ID}</a><br><br>
			<b>Note:</b> Automatic updates will be disabled until this issue is resolved.<br>
			</i>
		EOF
	)"
	# shellcheck disable=SC2086
	issue_number=$(
		gh issue create \
			--title "Auto update failing for ${pkg_name}" \
			--body "${body:0:${max_body_length}}" \
			--label "auto update failing" --label "bot" \
			$assignee |
			grep -oE "[0-9]+" # Last component of the URL returned is the issue number.
	)
	if [ -z "${issue_number}" ]; then
		echo "ERROR: Failed to create issue."
		return 1
	fi

	echo "INFO: Created issue ${issue_number} for ${pkg_name}."

	if [[ -n "${body:${max_body_length}}" ]]; then
		# The body was too long, so we need to append the rest.
		while true; do
			body="${body:${max_body_length}}"
			if [[ -z "${body}" ]]; then
				break
			fi
			sleep 5 # Otherwise we might get rate limited.
			gh issue edit "$issue_number" \
				--body-file - <<<"$(
					gh issue view "$issue_number" \
						--json body \
						--jq '.body'
				)${body:0:${max_body_length}}" >/dev/null
			# NOTE: we use --body-file instead of --body to avoid shell error 'argument list too long'.
		done
	fi
}

_handle_failure() {
	echo # Newline.
	if [[ "${GITHUB_ACTIONS:-}" == "true" ]]; then
		echo "INFO: Creating issue for failed updates...(if any)"
		for pkg_name in "${!_FAILED_UPDATES[@]}"; do
			_gh_create_new_issue "${pkg_name}"
		done
	else
		echo "==> Failed updates:"
		local count=0
		for pkg_name in "${!_FAILED_UPDATES[@]}"; do
			count=$((count + 1))
			echo "${count}. ${pkg_name}"
		done
		exit 1
	fi
}

if [[ ${#_FAILED_UPDATES[@]} -gt 0 ]]; then
	_handle_failure
fi