#!/usr/bin/env sh

INPUT_PATH=
CONFIG_PATH=
HOSTNAME=
PORT=
USER=
IDENTITY=
HOSTKEY=

save_input() {
    input_file="$(mktemp -tp /tmp)"
    cat > "$input_file" <&0
    echo "$input_file"
    return 0
}

read_config() {
    HOSTNAME="$(jq -r .source.hostname < "$1")"
    PORT="$(jq -r '.source.port // "22"' < "$1")"
    USER="$(jq -r .source.user < "$1")"
    IDENTITY="$(jq -r .source.identity < "$1")"
    HOSTKEY="$(jq -r .source.hostkey < "$1")"
    return 0
}

write_config() {
    directory="$(mktemp -dp /tmp)"
    config="$directory/config"
    identity_file="$directory/identity"
    knownhosts_file="$directory/knownhosts"

    {
        echo "host $HOSTNAME"
        echo "    HostName $HOSTNAME"
        echo "    Port $PORT"
        echo "    User $USER"
        echo "    IdentityFile $identity_file"
        echo "    UserKnownHostsFile $knownhosts_file"
    } > "$config"
    echo "$IDENTITY" > "$identity_file"
    echo "$HOSTKEY" > "$knownhosts_file"
    chmod 600 "$identity_file" "$knownhosts_file" "$config"
    echo "$config"
    return 0
}

INPUT_PATH="$(save_input)"
read_config "$INPUT_PATH"
CONFIG_PATH="$(write_config)"

export INPUT_PATH
export CONFIG_PATH

get_version() {
    jq -r '.version // []' < "$INPUT_PATH"
}

get_files() {
    jq -r '.source.files?[]' < "$INPUT_PATH"
}

get_command() {
    jq -r '.params.command?' < "$INPUT_PATH"
}

get_directory() {
    jq -r '.params.directory // "/"' < "$INPUT_PATH"
}

get_workdir() {
    jq -r '.params.workdir // "$HOME"' < "$INPUT_PATH"
}

fetch_file_infos() {
    files_file="$(mktemp -tp /tmp)"
ssh -F "$CONFIG_PATH" "$HOSTNAME" sh -s << EOF > "$files_file"
    files="$("$1")"
    echo "\$files" | while read -r file; do
        echo "\$file"
        [ -e "\$file" ] && echo true || echo false
        [ -e "\$file" ] && echo "\$(stat --format=%Y "\$file")" || echo
    done
EOF
    echo "$files_file"
    return 0
}

_compute_version() {
    echo "["
    last_line=
    line_file=
    line_exists=
    line_modify=
    while read -r line; do
        if [ -z "$line_file" ]; then
            line_file="$line"
        elif [ -z "$line_exists" ]; then
            line_exists="$line"
        elif [ -z "$line_modify" ]; then
            line_modify="$line"
        else
            if "$line_exists"; then
                echo '{"path":' "\"$line_file\"," '"modify":' "$line_modify" '}',
            fi
            line_file="$line"
            line_exists=
            line_modify=
        fi
    done < "$1"
    if [ -n "$line_file" ] && [ -n "$line_exists" ] && [ -n "$line_modify" ] && "$line_exists"; then
        echo '{"path":' "\"$line_file\"," '"modify":' "$line_modify" '}'
    fi
    echo "]"
}

compute_version() {
    _compute_version "$@" | jq -r tostring
}