# This script should be sourced, not executed.

realpath_int() {
    wdir="$PWD"; [ "$PWD" = "/" ] && wdir=""
    arg=$1
    case "$arg" in
        /*) scriptdir="${arg}";;
        *) scriptdir="$wdir/${arg#./}";;
    esac
    scriptdir="${scriptdir%/*}"
    echo "$scriptdir"
}


idf_export_main() {
    # The file doesn't have executable permissions, so this shouldn't really happen.
    # Doing this in case someone tries to chmod +x it and execute...

    # shellcheck disable=SC2128,SC2169,SC2039 # ignore array expansion warning
    if [ -n "${BASH_SOURCE}" ] && [ "${BASH_SOURCE[0]}" = "${0}" ]
    then
        echo "This script should be sourced, not executed:"
        # shellcheck disable=SC2039  # reachable only with bash
        echo ". ${BASH_SOURCE[0]}"
        return 1
    fi

    if [ -z "${IDF_PATH}" ]
    then
        # IDF_PATH not set in the environment.
        # If using bash or zsh, try to guess IDF_PATH from script location.
        self_path=""

        # shellcheck disable=SC2128  # ignore array expansion warning
        if [ -n "${BASH_SOURCE}" ]
        then
            self_path="${BASH_SOURCE}"
        elif [ -n "${ZSH_VERSION}" ]
        then
            self_path="${(%):-%x}"
        else
            echo "Could not detect IDF_PATH. Please set it before sourcing this script:"
            echo "  export IDF_PATH=(add path here)"
            return 1
        fi

        # shellcheck disable=SC2169,SC2169,SC2039  # unreachable with 'dash'
        if [[ "$OSTYPE" == "darwin"* ]]; then
            # convert possibly relative path to absolute
            script_dir="$(realpath_int "${self_path}")"
            # resolve any ../ references to make the path shorter
            script_dir="$(cd "${script_dir}" || exit 1; pwd)"
        else
            # convert to full path and get the directory name of that
            script_name="$(readlink -f "${self_path}")"
            script_dir="$(dirname "${script_name}")"
        fi
        export IDF_PATH="${script_dir}"
        echo "Setting IDF_PATH to '${IDF_PATH}'"
    else
        # IDF_PATH came from the environment, check if the path is valid
        if [ ! -d "${IDF_PATH}" ]
        then
            echo "IDF_PATH is set to '${IDF_PATH}', but it is not a valid directory."
            echo "If you have set IDF_PATH manually, check if the path is correct."
            return 1
        fi
        # Check if this path looks like an IDF directory
        if [ ! -f "${IDF_PATH}/tools/idf.py" ] || [ ! -f "${IDF_PATH}/tools/idf_tools.py" ]
        then
            echo "IDF_PATH is set to '${IDF_PATH}', but it doesn't look like an ESP-IDF directory."
            echo "If you have set IDF_PATH manually, check if the path is correct."
            return 1
        fi

        # The varible might have been set (rather than exported), re-export it to be sure
        export IDF_PATH="${IDF_PATH}"
    fi

    old_path="$PATH"

    echo "Detecting the Python interpreter"
    . "${IDF_PATH}/tools/detect_python.sh"

    echo "Adding ESP-IDF tools to PATH..."
    # Call idf_tools.py to export tool paths
    export IDF_TOOLS_EXPORT_CMD=${IDF_PATH}/export.sh
    export IDF_TOOLS_INSTALL_CMD=${IDF_PATH}/install.sh
    idf_exports=$("$ESP_PYTHON" "${IDF_PATH}/tools/idf_tools.py" export) || return 1
    eval "${idf_exports}"

    echo "Using Python interpreter in $(which python)"
    echo "Checking if Python packages are up to date..."
    python "${IDF_PATH}/tools/check_python_dependencies.py" || return 1


    # Allow calling some IDF python tools without specifying the full path
    # ${IDF_PATH}/tools is already added by 'idf_tools.py export'
    IDF_ADD_PATHS_EXTRAS="${IDF_PATH}/components/esptool_py/esptool"
    IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/espcoredump"
    IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/partition_table"
    IDF_ADD_PATHS_EXTRAS="${IDF_ADD_PATHS_EXTRAS}:${IDF_PATH}/components/app_update"
    export PATH="${IDF_ADD_PATHS_EXTRAS}:${PATH}"

    if [ -n "$BASH" ]
    then
        path_prefix=${PATH%%${old_path}}
        # shellcheck disable=SC2169,SC2039  # unreachable with 'dash'
        paths="${path_prefix//:/ }"
        if [ -n "${paths}" ]; then
            echo "Added the following directories to PATH:"
        else
            echo "All paths are already set."
        fi
        for path_entry in ${paths}
        do
            echo "  ${path_entry}"
        done
    else
        echo "Updated PATH variable:"
        echo "  ${PATH}"
    fi

    # Clean up
    unset old_path
    unset paths
    unset path_prefix
    unset path_entry
    unset IDF_ADD_PATHS_EXTRAS
    unset idf_exports
    unset ESP_PYTHON

    # Not unsetting IDF_PYTHON_ENV_PATH, it can be used by IDF build system
    # to check whether we are using a private Python environment

    echo "Done! You can now compile ESP-IDF projects."
    echo "Go to the project directory and run:"
    echo ""
    echo "  idf.py build"
    echo ""
}

idf_export_main

unset realpath_int
unset idf_export_main