#!/bin/bash

# Check if apt is free to use, or wait, until timeout.
#
# [internal]
#
# usage: ynh_wait_dpkg_free
# | exit: Return 1 if dpkg is broken
#
# Requires YunoHost version 3.3.1 or higher.
ynh_wait_dpkg_free() {
    local try
    set +o xtrace # set +x
    # With seq 1 17, timeout will be almost 30 minutes
    for try in $(seq 1 17); do
        # Check if /var/lib/dpkg/lock is used by another process
        if lsof /var/lib/dpkg/lock >/dev/null; then
            echo "apt is already in use..."
            # Sleep an exponential time at each round
            sleep $((try * try))
        else
            # Check if dpkg hasn't been interrupted and is fully available.
            # See this for more information: https://sources.debian.org/src/apt/1.4.9/apt-pkg/deb/debsystem.cc/#L141-L174
            local dpkg_dir="/var/lib/dpkg/updates/"

            # For each file in $dpkg_dir
            while read dpkg_file <&9; do
                # Check if the name of this file contains only numbers.
                if echo "$dpkg_file" | grep --perl-regexp --quiet "^[[:digit:]]+$"; then
                    # If so, that a remaining of dpkg.
                    ynh_print_err "dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem."
                    set -o xtrace # set -x
                    return 1
                fi
            done 9<<<"$(ls -1 $dpkg_dir)"
            set -o xtrace # set -x
            return 0
        fi
    done
    echo "apt still used, but timeout reached !"
    set -o xtrace # set -x
}

# Check either a package is installed or not
#
# example: ynh_package_is_installed --package=yunohost && echo "installed"
#
# usage: ynh_package_is_installed --package=name
# | arg: -p, --package=     - the package name to check
# | ret: 0 if the package is installed, 1 else.
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_is_installed() {
    # Declare an array to define the options of this helper.
    local legacy_args=p
    local -A args_array=([p]=package=)
    local package
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    dpkg-query --show --showformat='${Status}' "$package" 2>/dev/null \
        | grep --count "ok installed" &>/dev/null
}

# Get the version of an installed package
#
# example: version=$(ynh_package_version --package=yunohost)
#
# [internal]
#
# usage: ynh_package_version --package=name
# | arg: -p, --package=     - the package name to get version
# | ret: the version or an empty string
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_version() {
    # Declare an array to define the options of this helper.
    local legacy_args=p
    local -A args_array=([p]=package=)
    local package
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    if ynh_package_is_installed "$package"; then
        dpkg-query --show --showformat='${Version}' "$package" 2>/dev/null
    else
        echo ''
    fi
}

# APT wrapper for non-interactive operation
#
# [internal]
#
# usage: ynh_apt update
#
# Requires YunoHost version 2.4.0.3 or higher.
ynh_apt() {
    ynh_wait_dpkg_free
    LC_ALL=C DEBIAN_FRONTEND=noninteractive apt-get --assume-yes --quiet -o=Acquire::Retries=3 -o=Dpkg::Use-Pty=0 $@
}

# Update package index files
#
# [internal]
#
# usage: ynh_package_update
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_update() {
    ynh_apt update
}

# Install package(s)
#
# [internal]
#
# usage: ynh_package_install name [name [...]]
# | arg: name - the package name to install
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_install() {
    ynh_apt --no-remove --option Dpkg::Options::=--force-confdef \
        --option Dpkg::Options::=--force-confold install $@
}

# Remove package(s)
#
# [internal]
#
# usage: ynh_package_remove name [name [...]]
# | arg: name - the package name to remove
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_remove() {
    ynh_apt remove $@
}

# Remove package(s) and their uneeded dependencies
#
# [internal]
#
# usage: ynh_package_autoremove name [name [...]]
# | arg: name - the package name to remove
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_autoremove() {
    ynh_apt autoremove $@
}

# Purge package(s) and their uneeded dependencies
#
# [internal]
#
# usage: ynh_package_autopurge name [name [...]]
# | arg: name - the package name to autoremove and purge
#
# Requires YunoHost version 2.7.2 or higher.
ynh_package_autopurge() {
    ynh_apt autoremove --purge $@
}

# Build and install a package from an equivs control file
#
# [internal]
#
# example: generate an empty control file with `equivs-control`, adjust its
#          content and use helper to build and install the package:
#              ynh_package_install_from_equivs /path/to/controlfile
#
# usage: ynh_package_install_from_equivs controlfile
# | arg: controlfile - path of the equivs control file
#
# Requires YunoHost version 2.2.4 or higher.
ynh_package_install_from_equivs() {
    local controlfile=$1

    # retrieve package information
    local pkgname=$(grep '^Package: ' $controlfile | cut --delimiter=' ' --fields=2)    # Retrieve the name of the debian package
    local pkgversion=$(grep '^Version: ' $controlfile | cut --delimiter=' ' --fields=2) # And its version number
    [[ -z "$pkgname" || -z "$pkgversion" ]] \
        && ynh_die --message="Invalid control file" # Check if this 2 variables aren't empty.

    # Update packages cache
    ynh_package_update

    # Build and install the package
    local TMPDIR=$(mktemp --directory)

    # Make sure to delete the legacy compat file
    # It's now handle somewhat magically through the control file
    rm -f /usr/share/equivs/template/debian/compat

    # Note that the cd executes into a sub shell
    # Create a fake deb package with equivs-build and the given control file
    # Install the fake package without its dependencies with dpkg
    # Install missing dependencies with ynh_package_install
    ynh_wait_dpkg_free
    cp "$controlfile" "${TMPDIR}/control"
    (
        cd "$TMPDIR"
        LC_ALL=C equivs-build ./control 2>&1
        LC_ALL=C dpkg --force-depends --install "./${pkgname}_${pkgversion}_all.deb" 2>&1 | tee ./dpkg_log
    )

    ynh_package_install --fix-broken \
        || { # If the installation failed
            # (the following is ran inside { } to not start a subshell otherwise ynh_die wouldnt exit the original process)
            # Parse the list of problematic dependencies from dpkg's log ...
            # (relevant lines look like: "foo-ynh-deps depends on bar; however:")
            local problematic_dependencies="$(cat $TMPDIR/dpkg_log | grep -oP '(?<=-ynh-deps depends on ).*(?=; however)' | tr '\n' ' ')"
            # Fake an install of those dependencies to see the errors
            # The sed command here is, Print only from 'Reading state info' to the end.
            [[ -n "$problematic_dependencies" ]] && ynh_package_install $problematic_dependencies --dry-run 2>&1 | sed --quiet '/Reading state info/,$p' | grep -v "fix-broken\|Reading state info" >&2
            ynh_die --message="Unable to install dependencies"
        }
    [[ -n "$TMPDIR" ]] && rm --recursive --force $TMPDIR # Remove the temp dir.

    # check if the package is actually installed
    ynh_package_is_installed "$pkgname"
}

YNH_INSTALL_APP_DEPENDENCIES_REPLACE="true"

# Define and install dependencies with a equivs control file
#
# [packagingv1]
#
# This helper can/should only be called once per app
#
# example : ynh_install_app_dependencies dep1 dep2 "dep3|dep4|dep5"
#
# usage: ynh_install_app_dependencies dep [dep [...]]
# | arg: dep - the package name to install in dependence.
# | arg: "dep1|dep2|…" - You can specify alternatives. It will require to install (dep1 or dep2, etc).
#
# Requires YunoHost version 2.6.4 or higher.
ynh_install_app_dependencies() {
    local dependencies=$@
    # Add a comma for each space between packages. But not add a comma if the space separate a version specification. (See  below)
    dependencies="$(echo "$dependencies" | sed 's/\([^\<=\>]\)\ \([^(]\)/\1, \2/g')"
    local dependencies=${dependencies//|/ | }

    local version=$(ynh_read_manifest --manifest_key="version")
    if [ -z "${version}" ] || [ "$version" == "null" ]; then
        version="1.0"
    fi
    local dep_app=${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

    # Check for specific php dependencies which requires sury
    # This grep will for example return "7.4" if dependencies is "foo bar php7.4-pwet php-gni"
    # The (?<=php) syntax corresponds to lookbehind ;)
    local specific_php_version=$(echo $dependencies | grep -oP '(?<=php)[0-9.]+(?=-|\>|)' | sort -u)

    if [[ -n "$specific_php_version" ]]
    then
        # Cover a small edge case where a packager could have specified "php7.4-pwet php5-gni" which is confusing
        [[ $(echo $specific_php_version | wc -l) -eq 1 ]] \
            || ynh_die --message="Inconsistent php versions in dependencies ... found : $specific_php_version"

        dependencies+=", php${specific_php_version}, php${specific_php_version}-fpm, php${specific_php_version}-common"

        local old_phpversion=$(ynh_app_setting_get --app=$app --key=phpversion)

        # If the PHP version changed, remove the old fpm conf
        if [ -n "$old_phpversion" ] && [ "$old_phpversion" != "$specific_php_version" ]; then
            local old_php_fpm_config_dir=$(ynh_app_setting_get --app=$app --key=fpm_config_dir)
            local old_php_finalphpconf="$old_php_fpm_config_dir/pool.d/$app.conf"

            if [[ -f "$old_php_finalphpconf" ]]
            then
                ynh_backup_if_checksum_is_different --file="$old_php_finalphpconf"
                ynh_remove_fpm_config
            fi
        fi
        # Store phpversion into the config of this app
        ynh_app_setting_set --app=$app --key=phpversion --value=$specific_php_version

        # Set the default php version back as the default version for php-cli.
        if test -e /usr/bin/php$YNH_DEFAULT_PHP_VERSION
        then
            update-alternatives --set php /usr/bin/php$YNH_DEFAULT_PHP_VERSION
        fi
    elif grep --quiet 'php' <<< "$dependencies"; then
        ynh_app_setting_set --app=$app --key=phpversion --value=$YNH_DEFAULT_PHP_VERSION
    fi

    local psql_installed="$(ynh_package_is_installed "postgresql-$PSQL_VERSION" && echo yes || echo no)"

    # The first time we run ynh_install_app_dependencies, we will replace the
    # entire control file (This is in particular meant to cover the case of
    # upgrade script where ynh_install_app_dependencies is called with this
    # expected effect) Otherwise, any subsequent call will add dependencies
    # to those already present in the equivs control file.
    if [[ $YNH_INSTALL_APP_DEPENDENCIES_REPLACE == "true" ]]
    then
        YNH_INSTALL_APP_DEPENDENCIES_REPLACE="false"
    else
        local current_dependencies=""
        if ynh_package_is_installed --package="${dep_app}-ynh-deps"
        then
            current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
            current_dependencies=${current_dependencies// | /|}
        fi
        dependencies="$current_dependencies, $dependencies"
    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

    # Trigger postgresql regenconf if we may have just installed postgresql
    local psql_installed2="$(ynh_package_is_installed "postgresql-$PSQL_VERSION" && echo yes || echo no)"
    if [[ "$psql_installed" != "$psql_installed2" ]]
    then
        yunohost tools regen-conf postgresql
    fi

}

# Add dependencies to install with ynh_install_app_dependencies
#
# [packagingv1]
#
# usage: ynh_add_app_dependencies --package=phpversion [--replace]
# | arg: -p, --package=     - Packages to add as dependencies for the app.
#
# Requires YunoHost version 3.8.1 or higher.
ynh_add_app_dependencies() {
    # Declare an array to define the options of this helper.
    local legacy_args=pr
    local -A args_array=([p]=package= [r]=replace)
    local package
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"

    ynh_print_warn --message="Packagers: ynh_add_app_dependencies is deprecated and is now only an alias to ynh_install_app_dependencies"
    ynh_install_app_dependencies "${package}"
}

# Remove fake package and its dependencies
#
# [packagingv1]
#
# Dependencies will removed only if no other package need them.
#
# usage: ynh_remove_app_dependencies
#
# Requires YunoHost version 2.6.4 or higher.
ynh_remove_app_dependencies() {
    local dep_app=${app//_/-}	# Replace all '_' by '-'

    local current_dependencies=""
    if ynh_package_is_installed --package="${dep_app}-ynh-deps"; then
        current_dependencies="$(dpkg-query --show --showformat='${Depends}' ${dep_app}-ynh-deps) "
        current_dependencies=${current_dependencies// | /|}
    fi

    # Edge case where the app dep may be on hold,
    # cf https://forum.yunohost.org/t/migration-error-cause-of-ffsync/20675/4
    if apt-mark showhold | grep -q -w ${dep_app}-ynh-deps
    then
        apt-mark unhold ${dep_app}-ynh-deps
    fi

    # Remove the fake package and its dependencies if they not still used.
    # (except if dpkg doesn't know anything about the package,
    # which should be symptomatic of a failed install, and we don't want bash to report an error)
    if dpkg-query --show ${dep_app}-ynh-deps &>/dev/null
    then
        ynh_package_autopurge ${dep_app}-ynh-deps
    fi
}

# Install packages from an extra repository properly.
#
# [packagingv1]
#
# 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, $app as default value.
#
# Requires YunoHost version 3.8.1 or higher.
ynh_install_extra_app_dependencies() {
    # Declare an array to define the options of this helper.
    local legacy_args=rpkn
    local -A args_array=([r]=repo= [p]=package= [k]=key= [n]=name=)
    local repo
    local package
    local key
    local name
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    name="${name:-$app}"
    key=${key:-}

    # 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_install_app_dependencies "$package"

    # Force to upgrade to the last version...
    # Without doing apt install, an already installed dep is not upgraded
    local apps_auto_installed="$(apt-mark showauto $package)"
    ynh_package_install "$package"
    [ -z "$apps_auto_installed" ] || apt-mark auto $apps_auto_installed

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

# Add an extra repository correctly, pin it and get the key.
#
# [internal]
#
# 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, $app as default value.
# | arg: -a, --append       - Do not overwrite existing files.
#
# Requires YunoHost version 3.8.1 or higher.
ynh_install_extra_repo() {
    # Declare an array to define the options of this helper.
    local legacy_args=rkpna
    local -A args_array=([r]=repo= [k]=key= [p]=priority= [n]=name= [a]=append)
    local repo
    local key
    local priority
    local name
    local append
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    name="${name:-$app}"
    append=${append:-0}
    key=${key:-}
    priority=${priority:-}

    if [ $append -eq 1 ]; then
        append="--append"
        wget_append="tee --append"
    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 "$key" ]; then
        mkdir --parents "/etc/apt/trusted.gpg.d"
        # Timeout option is here to enforce the timeout on dns query and tcp connect (c.f. man wget)
        wget --timeout 900 --quiet "$key" --output-document=- | 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.
#
# [internal]
#
# usage: ynh_remove_extra_repo [--name=name]
# | arg: -n, --name=    - Name for the files for this repo, $app as default value.
#
# Requires YunoHost version 3.8.1 or higher.
ynh_remove_extra_repo() {
    # Declare an array to define the options of this helper.
    local legacy_args=n
    local -A args_array=([n]=name=)
    local name
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    name="${name:-$app}"

    ynh_secure_remove --file="/etc/apt/sources.list.d/$name.list"
    # Sury pinning is managed by the regenconf in the core...
    [[ "$name" == "extra_php_version" ]] || ynh_secure_remove "/etc/apt/preferences.d/$name"
    if [ -e /etc/apt/trusted.gpg.d/$name.gpg ]; then
        ynh_secure_remove --file="/etc/apt/trusted.gpg.d/$name.gpg"
    fi

    # (Do we even create a .asc file anywhere ...?)
    if [ -e /etc/apt/trusted.gpg.d/$name.asc ]; then
        ynh_secure_remove --file="/etc/apt/trusted.gpg.d/$name.asc"
    fi

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

# Add a repository.
#
# [internal]
#
# 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, $app as default value.
# | arg: -a, --append       - Do not overwrite existing files.
#
# Example for a repo like deb http://forge.yunohost.org/debian/ stretch stable
#                             uri                               suite   component
# ynh_add_repo --uri=http://forge.yunohost.org/debian/ --suite=stretch --component=stable
#
# Requires YunoHost version 3.8.1 or higher.
ynh_add_repo() {
    # Declare an array to define the options of this helper.
    local legacy_args=uscna
    local -A args_array=([u]=uri= [s]=suite= [c]=component= [n]=name= [a]=append)
    local uri
    local suite
    local component
    local name
    local append
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    name="${name:-$app}"
    append=${append:-0}

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

    mkdir --parents "/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"
}

# Pin a repository.
#
# [internal]
#
# 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, $app as default value.
# | arg: -a, --append       - Do not overwrite existing files.
#
# See https://manpages.debian.org/stretch/apt/apt_preferences.5.en.html#How_APT_Interprets_Priorities for information about pinning.
#
# Requires YunoHost version 3.8.1 or higher.
ynh_pin_repo() {
    # Declare an array to define the options of this helper.
    local legacy_args=pirna
    local -A args_array=([p]=package= [i]=pin= [r]=priority= [n]=name= [a]=append)
    local package
    local pin
    local priority
    local name
    local append
    # Manage arguments with getopts
    ynh_handle_getopts_args "$@"
    package="${package:-*}"
    priority=${priority:-50}
    name="${name:-$app}"
    append=${append:-0}

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

    # Sury pinning is managed by the regenconf in the core...
    [[ "$name" != "extra_php_version" ]] || return 0

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