#!/bin/bash

# Pin a repository.
#
# usage: ynh_pin_repo --package=packages --pin=pin_filter [--priority=priority_value] [--name=name] [--append]
# | arg: -p, --package - Packages concerned by the pin. Or all, *.
# | arg: -i, --pin - Filter for the pin.
# | arg: -p, --priority - Priority for the pin
# | arg: -n, --name - Name for the files for this repo, $app as default value.
# | arg: -a, --append - Do not overwrite existing files.
#
# See https://manpages.debian.org/stretch/apt/apt_preferences.5.en.html for information about pinning.
#
ynh_pin_repo () {
	# Declare an array to define the options of this helper.
	local legacy_args=pirna
	declare -Ar args_array=( [p]=package= [i]=pin= [r]=priority= [n]=name= [a]=append )
	local package
	local pin
	local priority
	local name
	local append
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	package="${package:-*}"
	priority=${priority:-50}
	name="${name:-$app}"
	append=${append:-0}

	if [ $append -eq 1 ]
	then
		append="tee -a"
	else
		append="tee"
	fi

	mkdir -p "/etc/apt/preferences.d"
	echo "Package: $package
Pin: $pin
Pin-Priority: $priority" \
	| $append "/etc/apt/preferences.d/$name"
}

# Add a repository.
#
# usage: ynh_add_repo --uri=uri --suite=suite --component=component [--name=name] [--append]
# | arg: -u, --uri - Uri of the repository.
# | arg: -s, --suite - Suite of the repository.
# | arg: -c, --component - Component of the repository.
# | arg: -n, --name - Name for the files for this repo, $app as default value.
# | arg: -a, --append - Do not overwrite existing files.
#
# Example for a repo like deb http://forge.yunohost.org/debian/ stretch stable
#                             uri                               suite   component
# ynh_add_repo --uri=http://forge.yunohost.org/debian/ --suite=stretch --component=stable
#
ynh_add_repo () {
	# Declare an array to define the options of this helper.
	local legacy_args=uscna
	declare -Ar args_array=( [u]=uri= [s]=suite= [c]=component= [n]=name= [a]=append )
	local uri
	local suite
	local component
	local name
	local append
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	name="${name:-$app}"
	append=${append:-0}

	if [ $append -eq 1 ]
	then
		append="tee -a"
	else
		append="tee"
	fi

	mkdir -p "/etc/apt/sources.list.d"
	# Add the new repo in sources.list.d
	echo "deb $uri $suite $component" \
		| $append "/etc/apt/sources.list.d/$name.list"
}

# Add an extra repository correctly, pin it and get the key.
#
# usage: ynh_install_extra_repo --repo="repo" [--key=key_url] [--priority=priority_value] [--name=name] [--append]
# | arg: -r, --repo - Complete url of the extra repository.
# | arg: -k, --key - url to get the public key.
# | arg: -p, --priority - Priority for the pin
# | arg: -n, --name - Name for the files for this repo, $app as default value.
# | arg: -a, --append - Do not overwrite existing files.
ynh_install_extra_repo () {
	# Declare an array to define the options of this helper.
	local legacy_args=rkpna
	declare -Ar args_array=( [r]=repo= [k]=key= [p]=priority= [n]=name= [a]=append )
	local repo
	local key
	local priority
	local name
	local append
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	name="${name:-$app}"
	append=${append:-0}
	key=${key:-0}
	priority=${priority:-}

	if [ $append -eq 1 ]
	then
		append="--append"
		wget_append="tee -a"
	else
		append=""
		wget_append="tee"
	fi

	# Split the repository into uri, suite and components.
	# Remove "deb " at the beginning of the repo.
	repo="${repo#deb }"

	# Get the uri
	local uri="$(echo "$repo" | awk '{ print $1 }')"

	# Get the suite
	local suite="$(echo "$repo" | awk '{ print $2 }')"

	# Get the components
	local component="${repo##$uri $suite }"

	# Add the repository into sources.list.d
	ynh_add_repo --uri="$uri" --suite="$suite" --component="$component" --name="$name" $append

	# Pin the new repo with the default priority, so it won't be used for upgrades.
	# Build $pin from the uri without http and any sub path
	local pin="${uri#*://}"
	pin="${pin%%/*}"
	# Set a priority only if asked
	if [ -n "$priority" ]
	then
		priority="--priority=$priority"
	fi
	ynh_pin_repo --package="*" --pin="origin \"$pin\"" $priority --name="$name" $append

	# Get the public key for the repo
	if [ -n "$key" ]
	then
		mkdir -p "/etc/apt/trusted.gpg.d"
		wget -q "$key" -O - | gpg --dearmor | $wget_append /etc/apt/trusted.gpg.d/$name.gpg > /dev/null
	fi

	# Update the list of package with the new repo
	ynh_package_update
}

# Remove an extra repository and the assiociated configuration.
#
# usage: ynh_remove_extra_repo [--name=name]
# | arg: -n, --name - Name for the files for this repo, $app as default value.
ynh_remove_extra_repo () {
	# Declare an array to define the options of this helper.
	local legacy_args=n
	declare -Ar args_array=( [n]=name= )
	local name
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	name="${name:-$app}"

	ynh_secure_remove "/etc/apt/sources.list.d/$name.list"
	ynh_secure_remove "/etc/apt/preferences.d/$name"
	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.gpg"
	ynh_secure_remove "/etc/apt/trusted.gpg.d/$name.asc"

	# Update the list of package to exclude the old repo
	ynh_package_update
}

# Install packages from an extra repository properly.
#
# usage: ynh_install_extra_app_dependencies --repo="repo" --package="dep1 dep2" [--key=key_url] [--name=name]
# | arg: -r, --repo - Complete url of the extra repository.
# | arg: -p, --package - The packages to install from this extra repository
# | arg: -k, --key - url to get the public key.
# | arg: -n, --name - Name for the files for this repo, $app as default value.
ynh_install_extra_app_dependencies () {
	# Declare an array to define the options of this helper.
	local legacy_args=rpkn
	declare -Ar args_array=( [r]=repo= [p]=package= [k]=key= [n]=name= )
	local repo
	local package
	local key
	local name
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	name="${name:-$app}"
	key=${key:-0}

	# Set a key only if asked
	if [ -n "$key" ]
	then
		key="--key=$key"
	fi
	# Add an extra repository for those packages
	ynh_install_extra_repo --repo="$repo" $key --priority=995 --name=$name

	# Install requested dependencies from this extra repository.
	ynh_add_app_dependencies --package="$package"

	# Remove this extra repository after packages are installed
	ynh_remove_extra_repo --name=$app
}

#=================================================

# patched version of ynh_install_app_dependencies to be used with ynh_add_app_dependencies

# Define and install dependencies with a equivs control file
# This helper can/should only be called once per app
#
# usage: ynh_install_app_dependencies dep [dep [...]]
# | arg: dep - the package name to install in dependence
#   You can give a choice between some package with this syntax : "dep1|dep2"
#   Example : ynh_install_app_dependencies dep1 dep2 "dep3|dep4|dep5"
#   This mean in the dependence tree : dep1 & dep2 & (dep3 | dep4 | dep5)
#
# Requires YunoHost version 2.6.4 or higher.
ynh_install_app_dependencies () {
    local dependencies=$@
    dependencies="$(echo "$dependencies" | sed 's/\([^\<=\>]\)\ \([^(]\)/\1, \2/g')"
    dependencies=${dependencies//|/ | }
    local manifest_path="../manifest.json"
    if [ ! -e "$manifest_path" ]; then
    	manifest_path="../settings/manifest.json"	# Into the restore script, the manifest is not at the same place
    fi

    local version=$(grep '\"version\": ' "$manifest_path" | cut -d '"' -f 4)	# Retrieve the version number in the manifest file.
    if [ ${#version} -eq 0 ]; then
        version="1.0"
    fi
    local dep_app=${app//_/-}	# Replace all '_' by '-'

    # Handle specific versions
    if [[ "$dependencies" =~ [\<=\>] ]]
    then
        # Replace version specifications by relationships syntax
        # https://www.debian.org/doc/debian-policy/ch-relationships.html
        # Sed clarification
        # [^(\<=\>] ignore if it begins by ( or < = >. To not apply twice.
        # [\<=\>] matches < = or >
        # \+ matches one or more occurence of the previous characters, for >= or >>.
        # [^,]\+ matches all characters except ','
        # Ex: package>=1.0 will be replaced by package (>= 1.0)
        dependencies="$(echo "$dependencies" | sed 's/\([^(\<=\>]\)\([\<=\>]\+\)\([^,]\+\)/\1 (\2 \3)/g')"
    fi

    cat > /tmp/${dep_app}-ynh-deps.control << EOF	# Make a control file for equivs-build
Section: misc
Priority: optional
Package: ${dep_app}-ynh-deps
Version: ${version}
Depends: ${dependencies}
Architecture: all
Description: Fake package for $app (YunoHost app) dependencies
 This meta-package is only responsible of installing its dependencies.
EOF
    ynh_package_install_from_equivs /tmp/${dep_app}-ynh-deps.control \
        || ynh_die --message="Unable to install dependencies"	# Install the fake package and its dependencies
    rm /tmp/${dep_app}-ynh-deps.control
    ynh_app_setting_set --app=$app --key=apt_dependencies --value="$dependencies"
}

ynh_add_app_dependencies () {
	# Declare an array to define the options of this helper.
	local legacy_args=pr
	declare -Ar args_array=( [p]=package= [r]=replace)
	local package
	local replace
	# Manage arguments with getopts
	ynh_handle_getopts_args "$@"
	replace=${replace:-0}

	local current_dependencies=""
	if [ $replace -eq 0 ]
	then
		local dep_app=${app//_/-}	# Replace all '_' by '-'
		if ynh_package_is_installed --package="${dep_app}-ynh-deps"
		then
			current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
		fi

		current_dependencies=${current_dependencies// | /|}
	fi

	ynh_install_app_dependencies "${current_dependencies}${package}"
}