#!/bin/bash

# Extract a key from a plain command output
#
# example: yunohost user info tata --output-as plain | ynh_get_plain_key mail
#
# usage: ynh_get_plain_key key [subkey [subsubkey ...]]
# | ret: string - the key's value
#
# Requires YunoHost version 2.2.4 or higher.
ynh_get_plain_key() {
    local prefix="#"
    local founded=0
    local key=$1
    shift
    while read line; do
        if [[ "$founded" == "1" ]] ; then
            [[ "$line" =~ ^${prefix}[^#] ]] && return
            echo $line
        elif [[ "$line" =~ ^${prefix}${key}$ ]]; then
            if [[ -n "${1:-}" ]]; then
                prefix+="#"
                key=$1
                shift
            else
                founded=1
            fi
        fi
    done
}

# Restore a previous backup if the upgrade process failed
#
# usage:
# ynh_backup_before_upgrade
# ynh_clean_setup () {
# 	ynh_restore_upgradebackup
# }
# ynh_abort_if_errors
#
# Requires YunoHost version 2.7.2 or higher.
ynh_restore_upgradebackup () {
	ynh_print_err --message="Upgrade failed."
	local app_bck=${app//_/-}	# Replace all '_' by '-'

  	NO_BACKUP_UPGRADE=${NO_BACKUP_UPGRADE:-0}

	if [ "$NO_BACKUP_UPGRADE" -eq 0 ]
	then	
		# Check if an existing backup can be found before removing and restoring the application.
		if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$backup_number
		then
			# Remove the application then restore it
			sudo yunohost app remove $app
			# Restore the backup
			sudo yunohost backup restore $app_bck-pre-upgrade$backup_number --apps $app --force --debug
			ynh_die --message="The app was restored to the way it was before the failed upgrade."
		fi
	else
		ynh_print_warn --message="\$NO_BACKUP_UPGRADE is set, that means there's no backup to restore. You have to fix this upgrade by yourself !"
  	fi
}

# Make a backup in case of failed upgrade
#
# usage:
# ynh_backup_before_upgrade
# ynh_clean_setup () {
# 	ynh_restore_upgradebackup
# }
# ynh_abort_if_errors
#
# Requires YunoHost version 2.7.2 or higher.
ynh_backup_before_upgrade () {
	if [ ! -e "/etc/yunohost/apps/$app/scripts/backup" ]
	then
		ynh_print_warn --message="This app doesn't have any backup script."
		return
	fi
	backup_number=1
	local old_backup_number=2
	local app_bck=${app//_/-}	# Replace all '_' by '-'
	NO_BACKUP_UPGRADE=${NO_BACKUP_UPGRADE:-0}

        if [ "$NO_BACKUP_UPGRADE" -eq 0 ]
        then
		# Check if a backup already exists with the prefix 1
		if sudo yunohost backup list | grep -q $app_bck-pre-upgrade1
		then
			# Prefix becomes 2 to preserve the previous backup
			backup_number=2
			old_backup_number=1
		fi

		# Create backup
		sudo BACKUP_CORE_ONLY=1 yunohost backup create --apps $app --name $app_bck-pre-upgrade$backup_number --debug
		if [ "$?" -eq 0 ]
		then
			# If the backup succeeded, remove the previous backup
			if sudo yunohost backup list | grep -q $app_bck-pre-upgrade$old_backup_number
			then
				# Remove the previous backup only if it exists
				sudo yunohost backup delete $app_bck-pre-upgrade$old_backup_number > /dev/null
			fi
		else
			ynh_die --message="Backup failed, the upgrade process was aborted."
		fi
        else
                ynh_print_warn --message="\$NO_BACKUP_UPGRADE is set, backup will be avoided. Be careful, this upgrade is going to be operated without a security backup"
        fi
}

# Download, check integrity, uncompress and patch the source from app.src
#
# The file conf/app.src need to contains:
#
# SOURCE_URL=Address to download the app archive
# SOURCE_SUM=Control sum
# # (Optional) Program to check the integrity (sha256sum, md5sum...)
# # default: sha256
# SOURCE_SUM_PRG=sha256
# # (Optional) Archive format
# # default: tar.gz
# SOURCE_FORMAT=tar.gz
# # (Optional) Put false if sources are directly in the archive root
# # default: true
# # Instead of true, SOURCE_IN_SUBDIR could be the number of sub directories
# # to remove.
# SOURCE_IN_SUBDIR=false
# # (Optionnal) Name of the local archive (offline setup support)
# # default: ${src_id}.${src_format}
# SOURCE_FILENAME=example.tar.gz 
# # (Optional) If it set as false don't extract the source.
# # (Useful to get a debian package or a python wheel.)
# # default: true
# SOURCE_EXTRACT=(true|false)
#
# Details:
# This helper downloads sources from SOURCE_URL if there is no local source
# archive in /opt/yunohost-apps-src/APP_ID/SOURCE_FILENAME
#
# Next, it checks the integrity with "SOURCE_SUM_PRG -c --status" command.
#
# If it's ok, the source archive will be uncompressed in $dest_dir. If the
# SOURCE_IN_SUBDIR is true, the first level directory of the archive will be
# removed.
# If SOURCE_IN_SUBDIR is a numeric value, 2 for example, the 2 first level
# directories will be removed
#
# Finally, patches named sources/patches/${src_id}-*.patch and extra files in
# sources/extra_files/$src_id will be applied to dest_dir
#
#
# usage: ynh_setup_source --dest_dir=dest_dir [--source_id=source_id]
# | arg: -d, --dest_dir  - Directory where to setup sources
# | arg: -s, --source_id - Name of the app, if the package contains more than one app
#
# Requires YunoHost version 2.6.4 or higher.
ynh_setup_source () {
    # Declare an array to define the options of this helper.
    local legacy_args=ds
    declare -Ar args_array=( [d]=dest_dir= [s]=source_id= )
    local dest_dir
    local source_id
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    source_id="${source_id:-app}" # If the argument is not given, source_id equals "app"

    local src_file_path="$YNH_CWD/../conf/${source_id}.src"
    # In case of restore script the src file is in an other path.
    # So try to use the restore path if the general path point to no file.
    if [ ! -e "$src_file_path" ]; then
        src_file_path="$YNH_CWD/../settings/conf/${source_id}.src"
    fi

    # Load value from configuration file (see above for a small doc about this file
    # format)
    local src_url=$(grep 'SOURCE_URL=' "$src_file_path" | cut -d= -f2-)
    local src_sum=$(grep 'SOURCE_SUM=' "$src_file_path" | cut -d= -f2-)
    local src_sumprg=$(grep 'SOURCE_SUM_PRG=' "$src_file_path" | cut -d= -f2-)
    local src_format=$(grep 'SOURCE_FORMAT=' "$src_file_path" | cut -d= -f2-)
    local src_extract=$(grep 'SOURCE_EXTRACT=' "$src_file_path" | cut -d= -f2-)
    local src_in_subdir=$(grep 'SOURCE_IN_SUBDIR=' "$src_file_path" | cut -d= -f2-)
    local src_filename=$(grep 'SOURCE_FILENAME=' "$src_file_path" | cut -d= -f2-)

    # Default value
    src_sumprg=${src_sumprg:-sha256sum}
    src_in_subdir=${src_in_subdir:-true}
    src_format=${src_format:-tar.gz}
    src_format=$(echo "$src_format" | tr '[:upper:]' '[:lower:]')
    src_extract=${src_extract:-true}
    if [ "$src_filename" = "" ] ; then
        src_filename="${source_id}.${src_format}"
    fi
    local local_src="/opt/yunohost-apps-src/${YNH_APP_ID}/${src_filename}"

    if test -e "$local_src"
    then    # Use the local source file if it is present
        cp $local_src $src_filename
    else    # If not, download the source
        local out=`wget -nv -O $src_filename $src_url 2>&1` || ynh_print_err --message="$out"
    fi

    # Check the control sum
    echo "${src_sum} ${src_filename}" | ${src_sumprg} -c --status \
        || ynh_die --message="Corrupt source"

    # Extract source into the app dir
    mkdir -p "$dest_dir"

    if ! "$src_extract"
    then
        mv $src_filename $dest_dir
    elif [ "$src_format" = "zip" ]
    then 
        # Zip format
        # Using of a temp directory, because unzip doesn't manage --strip-components
        if $src_in_subdir ; then
            local tmp_dir=$(mktemp -d)
            unzip -quo $src_filename -d "$tmp_dir"
            cp -a $tmp_dir/*/. "$dest_dir"
            ynh_secure_remove --file="$tmp_dir"
        else
            unzip -quo $src_filename -d "$dest_dir"
        fi
    else
        local strip=""
        if [ "$src_in_subdir" != "false" ]
        then
            if [ "$src_in_subdir" == "true" ]; then
                local sub_dirs=1
            else
                local sub_dirs="$src_in_subdir"
            fi
            strip="--strip-components $sub_dirs"
        fi
        if [[ "$src_format" =~ ^tar.gz|tar.bz2|tar.xz$ ]] ; then
            tar -xf $src_filename -C "$dest_dir" $strip
        else
            ynh_die --message="Archive format unrecognized."
        fi
    fi

    # Apply patches
    if (( $(find $YNH_CWD/../sources/patches/ -type f -name "${source_id}-*.patch" 2> /dev/null | wc -l) > "0" )); then
        local old_dir=$(pwd)
        (cd "$dest_dir" \
            && for p in $YNH_CWD/../sources/patches/${source_id}-*.patch; do \
                patch -p1 < $p; done) \
            || ynh_die --message="Unable to apply patches"
        cd $old_dir
    fi

    # Add supplementary files
    if test -e "$YNH_CWD/../sources/extra_files/${source_id}"; then
        cp -a $YNH_CWD/../sources/extra_files/$source_id/. "$dest_dir"
    fi
}

# Curl abstraction to help with POST requests to local pages (such as installation forms)
#
# $domain and $path_url should be defined externally (and correspond to the domain.tld and the /path (of the app?))
#
# example: ynh_local_curl "/install.php?installButton" "foo=$var1" "bar=$var2"
# 
# usage: ynh_local_curl "page_uri" "key1=value1" "key2=value2" ...
# | arg: page_uri    - Path (relative to $path_url) of the page where POST data will be sent
# | arg: key1=value1 - (Optionnal) POST key and corresponding value
# | arg: key2=value2 - (Optionnal) Another POST key and corresponding value
# | arg: ...         - (Optionnal) More POST keys and values
#
# Requires YunoHost version 2.6.4 or higher.
ynh_local_curl () {
	# Define url of page to curl
	local local_page=$(ynh_normalize_url_path $1)
	local full_path=$path_url$local_page
	
	if [ "${path_url}" == "/" ]; then 
		full_path=$local_page
	fi
	
	local full_page_url=https://localhost$full_path

	# Concatenate all other arguments with '&' to prepare POST data
	local POST_data=""
	local arg=""
	for arg in "${@:2}"
	do
		POST_data="${POST_data}${arg}&"
	done
	if [ -n "$POST_data" ]
	then
		# Add --data arg and remove the last character, which is an unecessary '&'
		POST_data="--data ${POST_data::-1}"
	fi
	
	# Wait untils nginx has fully reloaded (avoid curl fail with http2)
	sleep 2

	# Curl the URL
	curl --silent --show-error -kL -H "Host: $domain" --resolve $domain:443:127.0.0.1 $POST_data "$full_page_url"
}

# Render templates with Jinja2
# 
# Attention : Variables should be exported before calling this helper to be
# accessible inside templates.
#
# usage: ynh_render_template some_template output_path
# | arg: some_template - Template file to be rendered
# | arg: output_path   - The path where the output will be redirected to
ynh_render_template() {
   local template_path=$1
   local output_path=$2
   mkdir -p "$(dirname $output_path)"
   # Taken from https://stackoverflow.com/a/35009576
   python2.7 -c 'import os, sys, jinja2; sys.stdout.write(
                    jinja2.Template(sys.stdin.read()
                 ).render(os.environ));' < $template_path > $output_path
}