#!/bin/sh
set -e

function usage () {
    echo "Usage: update-andromeda.sh [option]"
    echo "              Update Andromeda to the latest available version (default)"
    echo "  --dev       Update the development version of Andromeda"
}


if [ "$1" = '--dev' ]; then
    f=upgrade_dev
elif [ "$#" = 0 ]; then
    f=upgrade_query
else
    usage
    exit 1
fi

opam update

PINNED="$(opam pin list | grep andromeda || true)"

function upgrade_dev () {
    if [ "x$PINNED" = "x" ]; then
        DEV_VERSION="$(opam info andromeda | \
                             sed -rn \
                                 '/available-versions/s/.*[[:space:]]([^[:space:]]+~dev).*/\1/p')"
        if ! [ "$DEV_VERSION" ]; then
            echo 'No development version of Andromeda available.'
            exit 1
        fi
        echo "Switching to development version $DEV_VERSION"
        opam pin -y -k version add andromeda "$DEV_VERSION"
    fi
}

function upgrade_query () {
    if [ "$PINNED" ]; then
        RELEASE_AVAILABLE=$(opam upgrade --dry-run --verbose andromeda | \
                                   sed -nr 's/.*andromeda\.([^[:space:]]+) is not available.*/\1/p')

        if ! [ "x$RELEASE_AVAILABLE" = "x" ]; then
            echo ""
            echo "You are currently following the development version."
            echo 'Run `update-andromeda.sh --dev'"'"' to skip this question.'
            echo "Andromeda version $RELEASE_AVAILABLE has been released."
            echo "Do you want to switch to the available release?"
            until echo "$ANSWER" | grep -q -x -e 'y' -e 'yes' -e 'n' -e 'no'; do
                echo -n "[y/n]: "
                read ANSWER
            done
            if echo "$ANSWER" | grep -q -x -e 'y' -e 'yes'; then
                opam pin remove andromeda
            fi
        fi
    fi
}

$f

opam upgrade andromeda