#!/bin/env sh

# Script for installing ugit (git undo)
#
# This script can be executed via 
# curl:
#   sh -c "$(curl -fsSL https://raw.githubusercontent.com/Bhupesh-V/ugit/master/install)"
# or wget:
#   sh -c "$(wget -qO- https://raw.githubusercontent.com/Bhupesh-V/ugit/master/install)"
# or httpie:
#   sh -c "$(http --download https://raw.githubusercontent.com/Bhupesh-V/ugit/master/install)"

status_check() {
    if command -v ugit 2>&1 > /dev/null; then
        printf "\n\t%s\n" "You already have ${BOLD}ugit${RESET} installed."
        printf "\n\t%s\n" "Run ${BOLD}git undo${RESET} everytime you make a git mistake :)"
        exit 0
    fi
}

installed() {
    cmd=$(command -v "${1}")
    return ${?}
}

die() {
    >&2 echo "Fatal: $*"
    exit 1
}

# TODO
# check if correct version of fzf is there
# check if correct version of git is there
# check if correct version of bash is there

check_dependencies() {
    if ! command -v git > /dev/null 2>&1; then
        printf "\n%s\n" "${BOLD}Can't work without git 😞. Please install git version >=2.30.0${RESET}"
        exit 1
    fi
    if ! command -v fzf > /dev/null 2>&1; then
        printf "\n%s\n" "${BOLD}Can't work without fzf 😞. Please install fzf version >=0.21.0${RESET}"
        exit 1
    fi
    if ! command -v bash > /dev/null 2>&1; then
        printf "\n%s\n" "${BOLD}Can't work without bash 😞. Please install bash version >=4${RESET}"
        exit 1
    fi

    DEPS=""
    DEPS="${DEPS} awk" 
    DEPS="${DEPS} xargs"
    DEPS="${DEPS} cut"
    DEPS="${DEPS} nl"
    DEPS="${DEPS} tr"

    for DEP in ${DEPS}; do
        installed ${DEP} || die "Missing GNU Utility: '${DEP}'"
    done
}

set_permissions(){
    if [ -f ugit ] && ! chmod +x ugit; then
        printf "\n%s\n" "Unknown error while installing ugit"
        exit 1
    fi
    move_to_path
}

move_to_path(){
    printf "%s\n" "We require some permissions to move ugit to /usr/bin"

    if sudo mv ugit /usr/bin; then
        sudo ln -s ugit /usr/bin/git-undo
    else
        printf "\n%s\n" "Unknown error while installing ugit"
        exit 1
    fi
}

download_ugit(){
    UGIT_HOST="https://github.com/Bhupesh-V/ugit/releases/latest/download/ugit"

    printf "\n%s\n" "Downloading ugit from ${BOLD}$UGIT_HOST${RESET} ..."

    if curl -fsSL $UGIT_HOST -o ugit; then
        set_permissions
    else
        printf "\n%s\n" "Unknown error while downloading ugit"
        exit 1
    fi
}

config_check() {
    reflogExpire=$(git config --get gc.reflogExpire)
    if [ "$reflogExpire" = "" ] ; then
        printf "%s\n" "Setting ${BOLD}gc.reflogExpire${RESET} to 200 days"
        if ! git config --global gc.reflogExpire 200; then
            printf "%s\n" "Unexpected error while setting up gitconfig"
            exit 1
        fi
    elif [ "$reflogExpire" -lt 200 ]; then
        printf "%s\n" "ugit recommends increasing ${BOLD}gc.reflogExpire${RESET} config duration to 200 days."
    fi

    reflogExpireUnreachable=$(git config --get gc.reflogExpireUnreachable)
    if [ "$reflogExpireUnreachable" = "" ]; then
        printf "%s\n" "Setting ${BOLD}gc.reflogExpireUnreachable${RESET} to 90 days"
        if ! git config --global gc.reflogExpireUnreachable 90; then
            printf "%s\n" "Unexpected error while setting up gitconfig"
            exit 1
        fi
    elif [ "$reflogExpireUnreachable" -lt 90 ]; then
        printf "%s\n" "ugit recommends increasing ${BOLD}gc.reflogExpireUnreachable${RESET} config duration to 90 days."
    fi
}

main () {

    status_check
    check_dependencies
    download_ugit
    config_check

    printf "${BOLD}${ORANGE_FG}%s\n" ""
    printf "%s\n" "             _ _    "
    printf "%s\n" " _   _  __ _(_| |_  "
    printf "%s\n" "| | | |/ _\` | | __| "
    printf "%s\n" "| |_| | (_| | | |_  "
    printf "%s\n" " \__,_|\__, |_|\__| "
    printf "%s\n" "       |___/        "
    printf "${RESET}\n%s" ""

    printf "\t\t%s\n" ".... is now installed 👍"
    printf "\n%s" "Run ${BOLD}ugit --help${RESET} for any help & assistance"
    printf "\n%s\n" "Use ${BOLD}${ORANGE_FG}git undo${RESET} or ${BOLD}${ORANGE_FG}ugit${RESET} everytime you make a git mistake :)"

}

# check if tput exists
if ! command -v tput > /dev/null 2>&1; then
    # tput could not be found :(
    BOLD=""
    RESET=""
    ORANGE_FG=""
else
    BOLD=$(tput bold)
    RESET=$(tput sgr0)
    ORANGE_FG=$(tput setaf 208)
fi

main