#!/bin/sh

set -e

usage() {
    this=$1
    cat <<EOF
$this: download go binaries for akash-network/node

Usage: $this [-b] bindir [-d] [tag]
  -b sets bindir or installation directory, Defaults to ./bin
  -d turns on debug logging
   [tag] is a tag from
   https://github.com/akash-network/node/releases
   If tag is missing, then the latest will be used.

 Generated by godownloader
  https://github.com/goreleaser/godownloader

EOF
    exit 2
}

parse_args() {
    #BINDIR is ./bin unless set be ENV
    # over-ridden by flag below

    BINDIR=${BINDIR:-./bin}
    while getopts "b:dh?x" arg; do
        case "$arg" in
            b) BINDIR="$OPTARG" ;;
            d) log_set_priority 10 ;;
            h | \?) usage "$0" ;;
            x) set -x ;;
        esac
    done
    shift $((OPTIND - 1))
    TAG=$1
}
# this function wraps all the destructive operations
# if a curl|bash cuts off the end of the script due to
# network, either nothing will happen or will syntax error
# out preventing half-done work
execute() {
    tmpdir=$(mktemp -d)
    log_debug "downloading files into ${tmpdir}"
    http_download "${tmpdir}/${TARBALL}" "${TARBALL_URL}"
    http_download "${tmpdir}/${CHECKSUM}" "${CHECKSUM_URL}"
    hash_sha256_verify "${tmpdir}/${TARBALL}" "${tmpdir}/${CHECKSUM}"
    srcdir="${tmpdir}"
    (cd "${tmpdir}" && untar "${TARBALL}")
    test ! -d "${BINDIR}" && install -d "${BINDIR}"
    for binexe in ${INSTALL_ARTIFACTS}; do
        if [ "$OS" = "windows" ]; then
            binexe="${binexe}.exe"
        fi
        install "${srcdir}/${binexe}" "${BINDIR}/"
        log_info "installed ${BINDIR}/${binexe}"
    done
    rm -rf "${tmpdir}"
}

is_supported_platform() {
    platform=$1
    found=1
    case "$platform" in
        linux/amd64) found=0 ;;
        linux/arm64) found=0 ;;
        darwin/amd64) found=0 ;;
        darwin/arm64) found=0 ;;
    esac
    case "$platform" in
        darwin/386) found=1 ;;
    esac
    return $found
}
check_platform() {
    if is_supported_platform "$PLATFORM"; then
        # optional logging goes here
        true
    else
        log_crit "platform $PLATFORM is not supported.  Make sure this script is up-to-date and file request at https://github.com/${PREFIX}/issues/new"
        exit 1
    fi
}
tag_to_version() {
    if [ -z "${TAG}" ]; then
        log_info "checking GitHub for latest tag"
    else
        log_info "checking GitHub for tag '${TAG}'"
    fi
    REALTAG=$(github_release "$OWNER/$REPO" "${TAG}") && true
    if test -z "$REALTAG"; then
        log_crit "unable to find '${TAG}' - use 'latest' or see https://github.com/${PREFIX}/releases for details"
        exit 1
    fi
    # if version starts with 'v', remove it
    TAG="$REALTAG"
    VERSION=${TAG#v}
}
adjust_format() {
    # change format (tar.gz or zip) based on OS
    true
}
adjust_os() {
    # adjust archive name based on OS
    true
}
adjust_arch() {
    # adjust archive name based on ARCH
    case ${OS} in
        darwin)
            ARCH=all
            ;;
    esac
}

cat /dev/null <<EOF
------------------------------------------------------------------------
https://github.com/client9/shlib - portable posix shell functions
Public domain - http://unlicense.org
https://github.com/client9/shlib/blob/master/LICENSE.md
but credit (and pull requests) appreciated.
------------------------------------------------------------------------
EOF
is_command() {
    command -v "$1" >/dev/null
}
echoerr() {
    echo "$@" 1>&2
}

#shellcheck disable=SC2329
log_prefix() {
    echo "$0"
}

_logp=6
log_set_priority() {
    _logp="$1"
}
log_priority() {
    if test -z "$1"; then
        echo "$_logp"
        return
    fi
    [ "$1" -le "$_logp" ]
}
log_tag() {
    case $1 in
        0) echo "emerg" ;;
        1) echo "alert" ;;
        2) echo "crit" ;;
        3) echo "err" ;;
        4) echo "warning" ;;
        5) echo "notice" ;;
        6) echo "info" ;;
        7) echo "debug" ;;
        *) echo "$1" ;;
    esac
}
log_debug() {
    log_priority 7 || return 0
    echoerr "$(log_prefix)" "$(log_tag 7)" "$@"
}
log_info() {
    log_priority 6 || return 0
    echoerr "$(log_prefix)" "$(log_tag 6)" "$@"
}
log_err() {
    log_priority 3 || return 0
    echoerr "$(log_prefix)" "$(log_tag 3)" "$@"
}
log_crit() {
    log_priority 2 || return 0
    echoerr "$(log_prefix)" "$(log_tag 2)" "$@"
}
uname_os() {
    os=$(uname -s | tr '[:upper:]' '[:lower:]')
    case "$os" in
        msys_nt) os="windows" ;;
    esac
    echo "$os"
}
uname_arch() {
    arch=$(uname -m)
    case $arch in
        x86_64) arch="amd64" ;;
        x86) arch="386" ;;
        i686) arch="386" ;;
        i386) arch="386" ;;
        aarch64) arch="arm64" ;;
        armv5*) arch="armv5" ;;
        armv6*) arch="armv6" ;;
        armv7*) arch="armv7" ;;
    esac
    echo "${arch}"
}
uname_os_check() {
    os=$(uname_os)
    case "$os" in
        darwin) return 0 ;;
        dragonfly) return 0 ;;
        freebsd) return 0 ;;
        linux) return 0 ;;
        android) return 0 ;;
        nacl) return 0 ;;
        netbsd) return 0 ;;
        openbsd) return 0 ;;
        plan9) return 0 ;;
        solaris) return 0 ;;
        windows) return 0 ;;
    esac
    log_crit "uname_os_check '$(uname -s)' got converted to '$os' which is not a GOOS value. Please file bug at https://github.com/client9/shlib"
    return 1
}
uname_arch_check() {
    arch=$(uname_arch)
    case "$arch" in
        386) return 0 ;;
        amd64) return 0 ;;
        arm64) return 0 ;;
        armv5) return 0 ;;
        armv6) return 0 ;;
        armv7) return 0 ;;
        ppc64) return 0 ;;
        ppc64le) return 0 ;;
        mips) return 0 ;;
        mipsle) return 0 ;;
        mips64) return 0 ;;
        mips64le) return 0 ;;
        s390x) return 0 ;;
        amd64p32) return 0 ;;
    esac
    log_crit "uname_arch_check '$(uname -m)' got converted to '$arch' which is not a GOARCH value.  Please file bug report at https://github.com/client9/shlib"
    return 1
}
untar() {
    tarball=$1
    case "${tarball}" in
        *.tar.gz | *.tgz) tar -xzf "${tarball}" ;;
        *.tar) tar -xf "${tarball}" ;;
        *.zip) unzip "${tarball}" ;;
        *)
            log_err "untar unknown archive format for ${tarball}"
            return 1
            ;;
    esac
}
http_download_curl() {
    local_file=$1
    source_url=$2
    header=$3
    if [ -z "$header" ]; then
        code=$(curl -w '%{http_code}' -sL -o "$local_file" "$source_url")
    else
        code=$(curl -w '%{http_code}' -sL -H "$header" -o "$local_file" "$source_url")
    fi
    if [ "$code" != "200" ]; then
        log_debug "http_download_curl received HTTP status $code"
        return 1
    fi
    return 0
}
http_download_wget() {
    local_file=$1
    source_url=$2
    header=$3
    if [ -z "$header" ]; then
        wget -q -O "$local_file" "$source_url"
    else
        wget -q --header "$header" -O "$local_file" "$source_url"
    fi
}
http_download() {
    log_debug "http_download $2"
    if is_command curl; then
        http_download_curl "$@"
        return
    elif is_command wget; then
        http_download_wget "$@"
        return
    fi
    log_crit "http_download unable to find wget or curl"
    return 1
}
http_copy() {
    tmp=$(mktemp)
    http_download "${tmp}" "$1" "$2" || return 1
    body=$(cat "$tmp")
    rm -f "${tmp}"
    echo "$body"
}
github_release() {
    owner_repo=$1
    version=$2
    test -z "$version" && version="latest"
    giturl="https://github.com/${owner_repo}/releases/${version}"
    json=$(http_copy "$giturl" "Accept:application/json")
    test -z "$json" && return 1
    version=$(echo "$json" | tr -s '\n' ' ' | sed 's/.*"tag_name":"//' | sed 's/".*//')
    test -z "$version" && return 1
    echo "$version"
}
hash_sha256() {
    TARGET=${1:-/dev/stdin}
    if is_command gsha256sum; then
        hash=$(gsha256sum "$TARGET") || return 1
        echo "$hash" | cut -d ' ' -f 1
    elif is_command sha256sum; then
        hash=$(sha256sum "$TARGET") || return 1
        echo "$hash" | cut -d ' ' -f 1
    elif is_command shasum; then
        hash=$(shasum -a 256 "$TARGET" 2>/dev/null) || return 1
        echo "$hash" | cut -d ' ' -f 1
    elif is_command openssl; then
        hash=$(openssl -dst openssl dgst -sha256 "$TARGET") || return 1
        echo "$hash" | cut -d ' ' -f a
    else
        log_crit "hash_sha256 unable to find command to compute sha-256 hash"
        return 1
    fi
}
hash_sha256_verify() {
    TARGET=$1
    checksums=$2
    if [ -z "$checksums" ]; then
        log_err "hash_sha256_verify checksum file not specified in arg2"
        return 1
    fi
    BASENAME=${TARGET##*/}
    want=$(grep "${BASENAME}" "${checksums}" 2>/dev/null | tr '\t' ' ' | cut -d ' ' -f 1)
    if [ -z "$want" ]; then
        log_err "hash_sha256_verify unable to find checksum for '${TARGET}' in '${checksums}'"
        return 1
    fi
    got=$(hash_sha256 "$TARGET")
    if [ "$want" != "$got" ]; then
        log_err "hash_sha256_verify checksum for '$TARGET' did not verify ${want} vs $got"
        return 1
    fi
}
cat /dev/null <<EOF
------------------------------------------------------------------------
End of functions from https://github.com/client9/shlib
------------------------------------------------------------------------
EOF

INSTALL_ARTIFACTS="akash"
PROJECT_NAME="akash"
OWNER="akash-network"
REPO="node"
FORMAT=zip
OS=${OS:=$(uname_os)}
ARCH=${ARCH:=$(uname_arch)}
PREFIX="$OWNER/$REPO"

# use in logging routines
log_prefix() {
    echo "$PREFIX"
}
PLATFORM="${OS}/${ARCH}"
GITHUB_DOWNLOAD=https://github.com/${OWNER}/${REPO}/releases/download

uname_os_check "$OS"
uname_arch_check "$ARCH"

parse_args "$@"

check_platform

tag_to_version

adjust_format

adjust_os

adjust_arch

log_info "found version: ${VERSION} for ${TAG}/${OS}/${ARCH}"

NAME=${PROJECT_NAME}_${VERSION}_${OS}_${ARCH}
TARBALL=${NAME}.${FORMAT}
TARBALL_URL=${GITHUB_DOWNLOAD}/${TAG}/${TARBALL}
CHECKSUM=${PROJECT_NAME}_${VERSION}_checksums.txt
CHECKSUM_URL=${GITHUB_DOWNLOAD}/${TAG}/${CHECKSUM}

execute
