#!/bin/sh

set -o errexit
set -o nounset

SCRIPTS_DIR="$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)"
ROOT_DIR="$(dirname -- "$SCRIPTS_DIR")"
DATA_DIR="$ROOT_DIR/data"

. "$SCRIPTS_DIR/common"

# Get the list of PHP extensions from the data file
#
# Arguments:
# $1: the path to the data file
#
# Output:
# the list of PHP extensions
getExtensionList() {
	getExtensionList_extensions=''
	IFS='
'
	for getExtensionList_line in $(cat -- "$1" | sort); do
		getExtensionList_extension=''
		IFS=' 	'
		for getExtensionList_chunk in $getExtensionList_line; do
			if test -z "$getExtensionList_extensions"; then
				getExtensionList_extensions="$getExtensionList_chunk"
			else
				getExtensionList_extensions="$getExtensionList_extensions $getExtensionList_chunk"
			fi
			break
		done
	done
	printf '%s' "$getExtensionList_extensions"
}

# Get the list of PHP versions from the data file
#
# Arguments:
# $1: the path to the data file
#
# Output:
# the list of PHP versions
getVersionList() {
	getVersionList_versions=''
	IFS='
'
	for getVersionList_line in $(cat -- "$1" | sort); do
		getVersionList_extension=''
		IFS=' 	'
		for getVersionList_chunk in $getVersionList_line; do
			if test -z "$getVersionList_extension"; then
				getVersionList_extension="$getVersionList_chunk"
			elif test -z "$getVersionList_versions"; then
				getVersionList_versions="$getVersionList_chunk"
			elif ! stringInList "$getVersionList_chunk" "$getVersionList_versions"; then
				getVersionList_versions="$getVersionList_versions $getVersionList_chunk"
			fi
		done
	done
	sortVersionList "$getVersionList_versions"
}

# Sort the list of PHP versions
#
# Arguments:
# $1: the list of PHP versions
#
# Output:
# the sorted list of PHP versions
sortVersionList() {
	sortVersionList_list=''
	IFS='
'
	for sortVersionList_version in $(printf '%s' "$1" | tr ' ' '\n' | sort -t '.' -k 1,1n -k 2,2n -k 3,3n); do
		if test -z "$sortVersionList_list"; then
			sortVersionList_list="$sortVersionList_version"
		else
			sortVersionList_list="$sortVersionList_list $sortVersionList_version"
		fi
	done
	printf '%s' "$sortVersionList_list"
}

# Generate the markdown table with the supported PHP extensions
#
# Arguments:
# $1: the path to the data file
#
# Output:
# the markdown table
generateExtensionsTable() {
	generateExtensionsTable_data=$(cat "$1")
	generateExtensionsTable_extensions="$(getExtensionList "$1")"
	generateExtensionsTable_versions="$(getVersionList "$1")"
	generateExtensionsTable_count=0
	printf '| Extension |'
	IFS=' '
	for generateExtensionsTable_version in $generateExtensionsTable_versions; do
		printf ' PHP %s |' "$generateExtensionsTable_version"
	done
	printf '\n'
	printf '|:---:|'
	for generateExtensionsTable_version in $generateExtensionsTable_versions; do
		printf -- ':---:|'
	done
	printf '\n'
	IFS=' '
	for generateExtensionsTable_extension in $generateExtensionsTable_extensions; do
		generateExtensionsTable_count=$((generateExtensionsTable_count + 1))
		printf '| %s |' "$generateExtensionsTable_extension"
		IFS=' '
		for generateExtensionsTable_version in $generateExtensionsTable_versions; do
			printf ' '
			generateExtensionsTable_versionOk=''
			IFS='
'
			for generateExtensionsTable_dataLine in $generateExtensionsTable_data; do
				if stringInList "$generateExtensionsTable_extension" "$generateExtensionsTable_dataLine"; then
					if stringInList "$generateExtensionsTable_version" "$generateExtensionsTable_dataLine"; then
						generateExtensionsTable_versionOk='y'
					fi
					break
				fi
			done
			if test -n "$generateExtensionsTable_versionOk"; then
				printf '✓'
			fi
			printf ' |'
		done
		printf '\n'
	done
	printf '\n'
	printf '*Number of supported extensions: %s*\n' $generateExtensionsTable_count
}

# Generate the markdown table with the special requirements for the PHP extensions
#
# Arguments:
# $1: the path to the data file
#
# Output:
# the markdown table
generateSpecialRequirementsTable() {
	generateSpecialRequirementsTable_started=''
	IFS='
'
	for generateSpecialRequirementsTable_line in $(cat -- "$1" | sort); do
		if test -z "$generateSpecialRequirementsTable_started"; then
			printf '| Extension | Requirements |\n'
			printf '|:---:|:---:|\n'
			generateSpecialRequirementsTable_started='y'
		fi
		resetIFS
		generateSpecialRequirementsTable_requirement="$(echo "$generateSpecialRequirementsTable_line" | sed -E 's/^\s*\w+\s+//')"
		case "$generateSpecialRequirementsTable_requirement" in
			zts)
				generateSpecialRequirementsTable_requirement='Requires images with PHP compiled with thread-safety enabled (`zts`).'
				;;
		esac
		printf '| %s | %s |\n' \
			"$(echo "$generateSpecialRequirementsTable_line" | awk '{print $1;}')" \
			"$generateSpecialRequirementsTable_requirement"
	done
}

# Generate the contents of README.md
#
# Arguments:
# $1: the path to the README file
# $2: the path to the extensions data file
# $3: the path to the special requirements data file
#
# Output:
# the markdown table
generateReadme() {
	generateReadme_ph_ExtensionsStart='<!-- START OF EXTENSIONS TABLE -->'
	generateReadme_ph_ExtensionsEnd='<!-- END OF EXTENSIONS TABLE -->'
	generateReadme_ph_SpecialStart='<!-- START OF SPECIAL REQUIREMENTS -->'
	generateReadme_ph_SpecialEnd='<!-- END OF SPECIAL REQUIREMENTS -->'
	generateReadme_skip=''
	while IFS= read -r generateReadme_line; do
		if test "$generateReadme_line" = "$generateReadme_ph_ExtensionsEnd" || test "$generateReadme_line" = "$generateReadme_ph_SpecialEnd"; then
			generateReadme_skip=''
		fi
		if test -z "$generateReadme_skip"; then
			printf '%s\n' "$generateReadme_line"
		fi
		if test "$generateReadme_line" = "$generateReadme_ph_ExtensionsStart"; then
			generateReadme_skip='y'
			printf '<!-- ########################################################### -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- #  DO NOT EDIT THIS TABLE: IT IS GENERATED AUTOMATICALLY  # -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- #  EDIT THE data/supported-extensions FILE INSTEAD        # -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- ########################################################### -->\n'
			generateExtensionsTable "$2"
		elif test "$generateReadme_line" = "$generateReadme_ph_SpecialStart"; then
			generateReadme_skip='y'
			printf '<!-- ########################################################### -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- #  DO NOT EDIT THIS TABLE: IT IS GENERATED AUTOMATICALLY  # -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- #  EDIT THE data/special-requirements FILE INSTEAD        # -->\n'
			printf '<!-- #                                                         # -->\n'
			printf '<!-- ########################################################### -->\n'
			generateSpecialRequirementsTable "$3"
		fi
	done <"$1"
	printf '%s' "$generateReadme_line"
}

NEW_README="$(generateReadme "$ROOT_DIR/README.md" "$DATA_DIR/supported-extensions" "$DATA_DIR/special-requirements")"
printf '%s\n' "$NEW_README" >"$ROOT_DIR/README.md"