#!/bin/sh

set -e
set -u
#set -x

__webi_main() {

    my_date="$(date +%F_%H-%M-%S)"
    export WEBI_TIMESTAMP="${my_date}"
    export _webi_tmp="${_webi_tmp:-$(
        mktemp -d -t "webi-$WEBI_TIMESTAMP.XXXXXXXX"
    )}"

    if [ -n "${_WEBI_PARENT:-}" ]; then
        export _WEBI_CHILD=true
    else
        export _WEBI_CHILD=
    fi
    export _WEBI_PARENT=true

    my_os="$(uname -s)"
    my_arch="$(uname -m)"

    ##
    ## Detect acceptable package formats
    ##

    my_ext=""
    set +e
    # NOTE: the order here is least favorable to most favorable
    if [ -n "$(command -v pkgutil)" ]; then
        my_ext="pkg,$my_ext"
    fi
    # disable this check for the sake of building the macOS installer on Linux
    #if [ -n "$(command -v diskutil)" ]; then
    # note: could also detect via hdiutil
    my_ext="dmg,$my_ext"
    #fi
    if [ -n "$(command -v git)" ]; then
        my_ext="git,$my_ext"
    fi
    if [ -n "$(command -v unxz)" ]; then
        my_ext="xz,$my_ext"
    fi
    if [ -n "$(command -v unzip)" ]; then
        my_ext="zip,$my_ext"
    fi
    # for mac/linux 'exe' refers to the uncompressed binary without extension
    my_ext="exe,$my_ext"
    if [ -n "$(command -v tar)" ]; then
        my_ext="tar,$my_ext"
    fi
    my_ext="$(echo "$my_ext" | sed 's/,$//')" # nix trailing comma
    set -e

    ##
    ## Detect http client
    ##

    set +e
    WEBI_CURL="$(command -v curl)"
    export WEBI_URL
    WEBI_WGET="$(command -v wget)"
    export WEBI_WGET
    set -e

    my_libc=''
    if ldd /bin/ls 2> /dev/null | grep -q 'musl' 2> /dev/null; then
        my_libc='musl'
    elif uname -o | grep -q 'GNU' || uname -s | grep -q 'Linux'; then
        my_libc='gnu'
    else
        my_libc='libc'
    fi

    export WEBI_HOST="${WEBI_HOST:-https://webinstall.dev}"

    # ex: Darwin or Linux
    my_sys="$(uname -s)"
    # ex: 22.6.0
    my_rev="$(uname -r)"
    # ex: arm64
    my_machine="$(uname -m)"

    export WEBI_UA="${my_sys}/${my_rev} ${my_machine}/unknown ${my_libc}"

    webinstall() {

        my_package="${1:-}"
        if [ -z "$my_package" ]; then
            echo >&2 "Usage: webi <package>@<version> ..."
            echo >&2 "Example: webi node@lts rg"
            exit 1
        fi

        WEBI_BOOT="$(
            mktemp -d -t "$my_package-bootstrap.$WEBI_TIMESTAMP.XXXXXXXX"
        )"
        export WEBI_BOOT

        my_installer_url="$WEBI_HOST/api/installers/$my_package.sh?formats=$my_ext"
        if [ -n "$WEBI_CURL" ]; then
            if ! curl -fsSL "$my_installer_url" -H "User-Agent: curl $WEBI_UA" \
                -o "$WEBI_BOOT/$my_package-bootstrap.sh"; then
                echo >&2 "error fetching '$my_installer_url'"
                exit 1
            fi
        else
            if ! wget -q "$my_installer_url" --user-agent="wget $WEBI_UA" \
                -O "$WEBI_BOOT/$my_package-bootstrap.sh"; then
                echo >&2 "error fetching '$my_installer_url'"
                exit 1
            fi
        fi

        (
            cd "$WEBI_BOOT"
            sh "$my_package-bootstrap.sh"
        )

        rm -rf "$WEBI_BOOT"

    }

    show_path_updates() {

        if test -z "${_WEBI_CHILD}"; then
            if test -f "$_webi_tmp/.PATH.env"; then
                my_paths=$(sort -u < "$_webi_tmp/.PATH.env")
                if test -n "$my_paths"; then
                    printf 'PATH.env updated with:\n'
                    printf "%s\n" "$my_paths"
                    printf '\n'
                    printf "\e[1m\e[35mTO FINISH\e[0m: copy, paste & run the following command:\n"
                    printf "\n"
                    printf "        \e[1m\e[32msource ~/.config/envman/PATH.env\e[0m\n"
                    printf "        (newly opened terminal windows will update automatically)\n"
                fi
                rm -f "$_webi_tmp/.PATH.env"
            fi
        fi

    }

    fn_checksum() {
        cmd_shasum='sha1sum'
        if command -v shasum > /dev/null; then
            cmd_shasum='shasum'
        fi
        $cmd_shasum "${0}" | cut -d' ' -f1 | cut -c 1-8
    }

    version() {
        my_checksum="$(
            fn_checksum
        )"
        my_version=v1.2.0
        printf "\e[35mwebi\e[32m %s\e[0m Copyright 2020+ AJ ONeal\n" "${my_version} (${my_checksum})"
        printf "    \e[36mhttps://webinstall.dev/webi\e[0m\n"
    }

    # show help if no params given or help flags are used
    usage() {
        echo ""
        version
        echo ""

        printf "\e[1mSUMMARY\e[0m\n"
        echo "    Webi is the best way to install the modern developer tools you love."
        echo "    It's fast, easy-to-remember, and conflict free."
        echo ""
        printf "\e[1mUSAGE\e[0m\n"
        echo "    webi <thing1>[@version] [thing2] ..."
        echo ""
        printf "\e[1mUNINSTALL\e[0m\n"
        echo "    Almost everything that is installed with webi is scoped to"
        echo "    ~/.local/opt/<thing1>, so you can remove it like so:"
        echo ""
        echo "    rm -rf ~/.local/opt/<thing1>"
        echo "    rm -f ~/.local/bin/<thing1>"
        echo ""
        echo "    Some packages have special uninstall instructions, check"
        echo "    https://webinstall.dev/<thing1> to be sure."
        echo ""
        printf "\e[1mOPTIONS\e[0m\n"
        echo "    Generic Program Information"
        echo "        --help Output a usage message and exit."
        echo ""
        echo "        -V, --version"
        echo "               Output the version number of webi and exit."
        echo ""
        echo "    Helper Utilities"
        echo "        --list Show everything webi has to offer."
        echo ""
        echo "        --info <package>"
        echo "               Show various links and example release."
        echo ""
        printf "\e[1mFAQ\e[0m\n"
        printf "    See \e[34mhttps://webinstall.dev/faq\e[0m\n"
        echo ""
        printf "\e[1mALWAYS REMEMBER\e[0m\n"
        echo "    Friends don't let friends use brew for simple, modern tools that don't need it."
        echo "    (and certainly not apt either **shudder**)"
        echo ""
    }

    if [ $# -eq 0 ] || echo "$1" | grep -q -E '^(-V|--version|version)$'; then
        version
        exit 0
    fi

    if echo "$1" | grep -q -E '^(-h|--help|help)$'; then
        usage "$@"
        exit 0
    fi

    if echo "$1" | grep -q -E '^(-l|--list|list)$'; then
        echo >&2 "[warn] the format of --list output may change"

        # because we don't have sitemap.xml for dev sites yet
        my_host="https://webinstall.dev"
        my_len="${#my_host}"

        # 6 because the field will looks like "loc>WEBI_HOST/PKG_NAME"
        # and the count is 1-indexed
        my_count="$((my_len + 6))"

        curl -fsS "${my_host}/sitemap.xml" |
            grep -F "${my_host}" |
            cut -d'<' -f2 |
            cut -c "${my_count}"-

        exit 0
    fi

    if echo "${1}" | grep -q -E '^(--info|info)$'; then
        if test -z "${2}"; then
            echo >&2 "Usage: webi --info <package>"
            exit 1
        fi

        echo >&2 "[warn] the output of --info is completely half-baked and will change"
        my_pkg="${2}"
        # TODO need a way to check that it exists at all (readme, win, lin)
        echo ""
        echo "    Cheat Sheet: ${WEBI_HOST}/${my_pkg}"
        echo "          POSIX: curl -sS ${WEBI_HOST}/${my_pkg} | sh"
        echo "        Windows: curl.exe -A MS ${WEBI_HOST}/${my_pkg} | powershell"
        echo "Releases (JSON): ${WEBI_HOST}/api/releases/${my_pkg}.json"
        echo " Releases (tsv): ${WEBI_HOST}/api/releases/${my_pkg}.tab"
        echo " (query params):     ?channel=stable&limit=10"
        echo "                     &os=${my_os}&arch=${my_arch}"
        echo " Install Script: ${WEBI_HOST}/api/installers/${my_pkg}.sh?formats=tar,zip,xz,git,dmg,pkg"
        echo "  Static Assets: ${WEBI_HOST}/packages/${my_pkg}/README.md"
        echo ""

        # TODO os=linux,macos,windows (limit to tagged releases)
        my_releases="$(
            curl -fsS "${WEBI_HOST}/api/releases/${my_pkg}.json?channel=stable&limit=1&pretty=true"
        )"

        if printf '%s\n' "${my_releases}" | grep -q "error"; then
            my_releases_beta="$(
                curl -fsS "${WEBI_HOST}/api/releases/${my_pkg}.json?&limit=1&pretty=true"
            )"
            if printf '%s\n' "${my_releases_beta}" | grep -q "error"; then
                echo >&2 "'${my_pkg}' is a special case that does not have releases"
            else
                echo >&2 "ERROR no stable releases for '${my_pkg}'!"
            fi
            exit 0
        fi

        echo >&2 "Stable '${my_pkg}' releases:"
        if command -v jq > /dev/null; then
            printf '%s\n' "${my_releases}" |
                jq
        else
            printf '%s\n' "${my_releases}"
        fi

        exit 0
    fi

    for pkgname in "$@"; do
        webinstall "$pkgname"
    done

    show_path_updates

}

__webi_main "$@"