#!/bin/bash

### Variables
DIALIN_FOLDER="../dialin"
DIALIN_SYMLINK="dialin"
DIALIN_SOURCE="$DIALIN_FOLDER/leahi_dialin"
DIALIN_REPO="git@bitbucket.org:diality-cloud/leahi-dialin.git"
DIALIN_BRANCH="staging"

### Errors
ERR_MISSING_PARAM_FOLDERNAME=1
ERR_MISSING_PARAM_FILENAME=2
ERR_FAILED_CLONE=3
ERR_FAILED_EXISTS_FOLDER=4
ERR_FAILED_EXISTS_FILE=5
ERR_FAILED_TEST_REPOSITORY=6
ERR_FAILED_SYMLINK=7
ERR_FAILED_CHECKOUT=8
ERR_FAILED_SPARSE_INIT=9
ERR_FAILED_SPARSE_SET=10

### Notifications
TXT_EXIST_ALREADY="Already exists"
TXT_SUCCEED_CLONE="The repository cloned successfully"
TXT_SUCCEED_SETUP="The repository successfully set up"
TXT_CHECKOUT_BRANCH="The repository set to chekout on"

### Functions
function succeed() {
    if ! (( $? )); then
        echo true
        return
    fi
    echo false
}

function existsFolder() {
    local foldername="$1"
    if [ "$foldername" == "" ]; then
        echo "ERR_MISSING_PARAM_FOLDERNAME"
        exit $ERR_MISSING_PARAM_FOLDERNAME
    fi
    if [ -d "$foldername" ]; then
        echo true
        return
    fi
    echo false
}

function existsLink() {
    local filename="$1"
    if [ "$filename" == "" ]; then
        echo "ERR_MISSING_PARAM_FILENAME"
        exit $ERR_MISSING_PARAM_FILENAME
    fi
    if [ -L "$filename" ]; then
        echo true
        return
    fi
    echo false
}

function validLink() {
    if [ $( readlink $DIALIN_SYMLINK ) == "$DIALIN_SOURCE" ]; then
        echo true
    fi
    echo false
}

function realPath() {
    local filename="$1"
    if $( existsLink $filename ); then
        if [ -L "$filename" ]; then
            local linkinfo=$(readlink $filename)
            local filepath=$(dirname  $linkinfo)
            echo $filepath
            return
        fi
    fi
    echo $(dirname "$0")
}

function isRepo() {
    if ! $(existsFolder "$1"); then
        echo "ERR_FAILED_EXISTS_FOLDER"
        exit $ERR_FAILED_EXISTS_FOLDER
    fi
    git -C "$1" status > /dev/null 2>&1
    echo $(succeed)
}

### dialin specific
function clone() {
    if $( existsFolder $DIALIN_FOLDER ); then
        echo "$TXT_EXIST_ALREADY $DIALIN_SOURCE"
        return
    fi
    echo "Clonning ..."
    git clone "$DIALIN_REPO" "$DIALIN_FOLDER" -b "$DIALIN_BRANCH"
    if ! $( succeed ); then
        echo "ERR_FAILED_CLONE"
        exit $ERR_FAILED_CLONE
    fi
}

function setup() {
    if ! $( isRepo "$DIALIN_FOLDER" ); then
        echo "ERR_FAILED_TEST_REPOSITORY"
        exit $ERR_FAILED_TEST_REPOSITORY
    fi

    if ! $( existsFolder $DIALIN_SOURCE ); then
        echo "$ERR_FAILED_EXISTS_FOLDER $DIALIN_SOURCE"
        exit $ERR_FAILED_EXISTS_FOLDER
    fi

    pushd "$DIALIN_FOLDER" > /dev/null 2>&1

    git sparse-checkout init
    if ! $( succeed ); then
        echo "ERR_FAILED_SPARSE_INIT"
        exit $ERR_FAILED_SPARSE_INIT
    fi

    git sparse-checkout set                 \
        'leahi_dialin/ui'                   \
        'leahi_dialin/common'               \
        'leahi_dialin/protocols'            \
        'leahi_dialin/utils/conversions.py' \
       '!leahi_dialin/common/__init__.py'
    if ! $( succeed ); then
        echo "ERR_FAILED_SPARSE_SET"
        exit $ERR_FAILED_SPARSE_SET
    fi

    popd > /dev/null 2>&1
}

function link() {
    if $( existsLink $DIALIN_SYMLINK ); then
        if ! $( validLink ); then
            rm $DIALIN_SYMLINK
        else
            return
        fi
    fi

    ln -s $DIALIN_SOURCE $DIALIN_SYMLINK
    if ! $( succeed ); then
        echo "ERR_FAILED_SYMLINK"
        exit $ERR_FAILED_SYMLINK
    fi
}

### Main
if [ "$1" != "" ]; then
    DIALIN_BRANCH="$1"
    echo "$TXT_CHECKOUT_BRANCH $DIALIN_BRANCH"
fi

cd "$(realPath "$0")"

clone
setup
link

echo "$TXT_SUCCEED_SETUP in $DIALIN_SYMLINK"
exit 0