#!/usr/bin/env bash

set -e

######
###### Build and output configuration
######

build_version () {
    GIT_VERSION="$(cd "$(find_sketch)"; git describe --abbrev=4 --dirty --always)"
    LIB_VERSION="$(cd "$(find_sketch)"; (grep version= ../../library.properties 2>/dev/null || echo version=0.0.0) | cut -d= -f2)-g${GIT_VERSION}"

    BUILD_PATH="${BUILD_PATH:-"$(mktemp -d 2>/dev/null || mktemp -d -t 'build')"}"
    OUTPUT_DIR="${OUTPUT_DIR:-output/${LIBRARY}}"
    OUTPUT_PATH="${OUTPUT_PATH:-${SOURCEDIR}/${OUTPUT_DIR}}"
}

build_filenames () {
    OUTPUT_FILE_PREFIX="${SKETCH}-${LIB_VERSION}"
    HEX_FILE_PATH="${OUTPUT_PATH}/${OUTPUT_FILE_PREFIX}.hex"
    HEX_FILE_WITH_BOOTLOADER_PATH="${OUTPUT_PATH}/${OUTPUT_FILE_PREFIX}-with-bootloader.hex"
    ELF_FILE_PATH="${OUTPUT_PATH}/${OUTPUT_FILE_PREFIX}.elf"
}

firmware_size () {
    if [ "${BOARD}" = "virtual" ]; then
        echo "[Size not computed for virtual build]"
        return
    fi

    ## This is a terrible hack, please don't hurt me. - algernon

    MAX_PROG_SIZE=28672

    output="$("$@" | grep "\\(Program\\|Data\\):" | sed -e 's,^,  - ,' && echo)"

    PROGSIZE="$(echo "${output}" | grep "Program:" | cut -d: -f2 | awk '{print $1}')"

    PERCENT="$(echo "${PROGSIZE}" "${MAX_PROG_SIZE}" | awk "{ printf \"%02.01f\", \$1 / \$2 * 100 }")"

    # we want the sed there, doing with shell builtins would be worse.
    # shellcheck disable=SC2001
    echo "${output}" | sed -e "s/\(Program:.*\)(\([0-9\.]*%\) Full)/\1(${PERCENT}% Full)/"
}


find_sketch () {
    SKETCH="${SKETCH:-${DEFAULT_SKETCH}}"
    LIBRARY="${LIBRARY:-${SKETCH}}"
    if [ -z "${SKETCH}" ] || [ -z "${LIBRARY}" ] || [ -z "${ROOT}" ] || [ -z "${SOURCEDIR}" ]; then
        echo "SKETCH, LIBRARY, SOURCEDIR, and ROOT need to be set before including this file!" >&2
        exit 1
    fi

    for path in "examples/${LIBRARY}" \
                    "src" \
		    "."; do
        if [ -f "${path}/${SKETCH}.ino" ]; then
            echo "${path}"
            return
        fi
    done
    echo "Couldn't find sketch (.ino file)" >&2
    exit 1
}

prepare_to_flash () {
    if [ ! -e "${HEX_FILE_PATH}" ]; then
        compile
        size
    fi

    echo "Press ENTER when ready..."

    # We do not want to permit line continuations here. We just want a newline.
    # shellcheck disable=SC2162
    read
}

flash () {
    prepare_to_flash
    reset_device
    sleep 3s
    find_bootloader_ports
    flash_over_usb || flash_over_usb
}

flash_over_usb () {
    if [ -z "${DEVICE_PORT_BOOTLOADER}" ]; then
        echo 'DEVICE_PORT_BOOTLOADER is empty (did you hold "Prog" to enable bootloader mode?)' >&2
        return 1
    fi
    sleep 1s
    ${AVRDUDE} -q -q -C "${AVRDUDE_CONF}" -p"${MCU}" -cavr109 -D -P "${DEVICE_PORT_BOOTLOADER}" -b57600 "-Uflash:w:${HEX_FILE_PATH}:i"
}

flash_from_bootloader() {
    prepare_to_flash
    find_bootloader_ports
    flash_over_usb || flash_over_usb
}

program() {
    prepare_to_flash
    flash_with_programmer
}

flash_with_programmer() {
    ${AVRDUDE} -v \
	       -C "${AVRDUDE_CONF}" \
	       -p"${MCU}" \
	       -cusbtiny \
	       -D \
	       -B 1 \
	       "-Uflash:w:${HEX_FILE_PATH}:i"
}

hex_with_bootloader () {
    if [ ! -e "${HEX_FILE_PATH}" ]; then
        compile
    fi

    awk '/^:00000001FF/ == 0' "${HEX_FILE_PATH}" > "${HEX_FILE_WITH_BOOTLOADER_PATH}"
    echo "Using ${BOOTLOADER_PATH}"
    ${MD5} "${BOOTLOADER_PATH}"
    cat "${BOOTLOADER_PATH}" >> "${HEX_FILE_WITH_BOOTLOADER_PATH}"
    ln -sf -- "${HEX_FILE_WITH_BOOTLOADER_PATH}" "${OUTPUT_PATH}/${SKETCH}-latest-with-bootloader.hex"
    cat <<- EOF

		Combined firmware and bootloader are now at ${HEX_FILE_WITH_BOOTLOADER_PATH}
		Make sure you have the bootloader version you expect.

		And TEST THIS ON REAL HARDWARE BEFORE YOU GIVE IT TO ANYONE

		EOF
}

build () {
    compile "$@"
    size "$@"
}

compile () {
    build_version
    build_filenames
    install -d "${OUTPUT_PATH}"

    echo "Building ${OUTPUT_DIR}/${SKETCH} (${LIB_VERSION}) ..."

    # This is defined in the (optional) user config.
    # shellcheck disable=SC2154
    ${compile_HOOKS}

    if [ -d "${ARDUINO_LOCAL_LIB_PATH}/libraries" ]; then
        # shellcheck disable=SC2089
        # We want literal backslashes here, not arrays.
        local_LIBS="-libraries \"${ARDUINO_LOCAL_LIB_PATH}/libraries\""
    fi

    ARDUINO_PACKAGES=""
    if [ -d "${ARDUINO_PACKAGE_PATH}" ]; then
        # shellcheck disable=SC2089
        # We want literal backslashes here, not arrays.
	      ARDUINO_PACKAGES="-hardware \"${ARDUINO_PACKAGE_PATH}\""
    fi

    # SC2091: We do not care if quotes or backslashes are not respected.
    # SC2086: We want word splitting.
    # shellcheck disable=SC2086,SC2090
    ${ARDUINO_BUILDER} \
        -compile \
	      ${ARDUINO_PACKAGES} \
	      -hardware "${ARDUINO_PATH}/hardware" \
	      -hardware "${BOARD_HARDWARE_PATH}" \
	      ${ARDUINO_TOOLS_PARAM} \
	      -tools "${ARDUINO_PATH}/tools-builder" \
	      -fqbn "${FQBN}" \
        -libraries "." \
        -libraries "${ROOT}" \
	      -libraries "${BOARD_HARDWARE_PATH}/.." \
        ${local_LIBS} \
	      ${EXTRA_BUILDER_ARGS} \
	      -build-path "${BUILD_PATH}" \
	      -ide-version "${ARDUINO_IDE_VERSION}" \
	      -prefs "compiler.cpp.extra_flags=-std=c++11 -Woverloaded-virtual -Wno-unused-parameter -Wno-unused-variable -Wno-ignored-qualifiers ${ARDUINO_CFLAGS} ${LOCAL_CFLAGS}" \
	      -warnings all \
        ${ARDUINO_VERBOSE} \
	      ${ARDUINO_AVR_GCC_PREFIX_PARAM} \
	      "$(find_sketch)/${SKETCH}.ino"

    cp "${BUILD_PATH}/${SKETCH}.ino.hex" "${HEX_FILE_PATH}"
    cp "${BUILD_PATH}/${SKETCH}.ino.elf" "${ELF_FILE_PATH}"
    ln -sf "${OUTPUT_FILE_PREFIX}.hex" "${OUTPUT_PATH}/${SKETCH}-latest.hex"
    ln -sf "${OUTPUT_FILE_PREFIX}.elf" "${OUTPUT_PATH}/${SKETCH}-latest.elf"

    if [ "${ARDUINO_VERBOSE}" = "-verbose" ]; then
	      echo "Build artifacts can be found in ${BUILD_PATH}";
    else
	      rm -rf "${BUILD_PATH}"
    fi
}

_find_all () {
    for plugin in ./*.ino \
	    	          examples/* \
                  src/*.ino; do
        if [ -d "$(dirname "${plugin}")" ] || [ -f "${plugin}" ]; then
            p="$(basename "${plugin}" .ino)"
            if [ "${p}" != '*' ]; then
                echo "${p}"
            fi
        fi
    done | sort
}

build_all () {
    plugins="$(_find_all)"

    for plugin in ${plugins}; do
        export SKETCH="${plugin}"
        export LIBRARY="${plugin}"
        $0 "${plugin}" build
    done
}

size () {
    if [ ! -e "${HEX_FILE_PATH}" ]; then
        compile
    fi

    echo "- Size: firmware/${LIBRARY}/${OUTPUT_FILE_PREFIX}.elf"
    firmware_size "${AVR_SIZE}" -C --mcu="${MCU}" "${ELF_FILE_PATH}"
    echo
}

size_map () {
    if [ ! -e "${HEX_FILE_PATH}" ]; then
        compile
    fi

    "${AVR_NM}" --size-sort -C -r -l -t decimal "${ELF_FILE_PATH}"
}

disassemble () {

    if [ ! -e "${HEX_FILE_PATH}" ]; then
        compile
    fi

    "${AVR_OBJDUMP}" -C -d "${ELF_FILE_PATH}"
}

decompile () {
    disassemble
}

clean () {
    rm -rf -- "${OUTPUT_PATH}"
}

reset_device() {
    find_device_port
    check_device_port
    reset_device_cmd
}

check_device_port () {
    if [ -z "$DEVICE_PORT" ]; then
        cat <<EOF >&2
Couldn't autodetect the keyboard's serial port.
If you see this message and your keyboard is connected to your computer,
it probably means that our serial port detection logic is buggy or incomplete.

Please report this issue at https://github.com/keyboardio/Kaleidoscope
EOF
        exit 1
    elif echo "$DEVICE_PORT" | grep -q '[[:space:]]'; then
        cat <<EOF >&2
Unexpected whitespace found in detected serial port:

    $DEVICE_PORT

If you see this message, it means that our serial port
detection logic is buggy or incomplete.

Please report this issue at https://github.com/keyboardio/Kaleidoscope
EOF
        exit 1
    fi

    if ! [ -w "$DEVICE_PORT" ]; then
        cat <<EOF >&2

$DEVICE_PORT is not writable:

  $(ls -l "$DEVICE_PORT")

You are currently in the following groups:

  $(id -Gn)

Please ensure you have followed the instructions on setting up your
account to be in the right group:

https://github.com/keyboardio/Kaleidoscope/wiki/Install-Arduino-support-on-Linux

EOF
        exit 1
    fi
}

usage () {
    cat <<- EOF
		Usage: $0 SKETCH commands...

		Runs all of the commands in the context of the Sketch.

		Available commands:

		  help
		    This help screen.

		  compile
		    Compiles the sketch.

		  size
		    Reports the size of the compiled sketch.

		  build
		    Runs compile and report-size.

		  clean
		    Cleans up the output directory.

		  size-map
		    Displays the size map for the sketch.

		  disassemble
		    Decompile the sketch.

		  reset-device
		    Reset the device.

		  flash
		    Flashes the firmware using avrdude.

		  build-all
		    Build all Sketches we can find.
		EOF
}

help () {
    usage
}

if [ $# -lt 1 ]; then
    usage
    exit 1
fi

## Parse the command-line
##  - anything that has a =, is an env var
##  - from the remaining stuff, the first one is the Library/Sketch
##  - everything else are commands
##
##  - if there is only one argument, that's a command

ROOT="$(cd "$(dirname "$0")"/..; pwd)"
export ROOT
# shellcheck disable=SC2155
export SOURCEDIR="$(pwd)"

if [ -e "${HOME}/.kaleidoscope-builder.conf" ]; then
    # shellcheck disable=SC1090
    . "${HOME}/.kaleidoscope-builder.conf"
fi

if [ -e "${SOURCEDIR}/.kaleidoscope-builder.conf" ]; then
    # shellcheck disable=SC1090
    . "${SOURCEDIR}/.kaleidoscope-builder.conf"
fi

if [ -e "${SOURCEDIR}/kaleidoscope-builder.conf" ]; then
    # shellcheck disable=SC1090
    . "${SOURCEDIR}/kaleidoscope-builder.conf"
fi

# shellcheck disable=SC1090
. "${ROOT}/etc/kaleidoscope-builder.conf"

if [ ! -z "${VERBOSE}" ] && [ "${VERBOSE}" -gt 0 ]; then
    ARDUINO_VERBOSE="-verbose"
else
    ARDUINO_VERBOSE="-quiet"
fi

cmds=""

## Export vars
for i in $(seq 1 $#); do
    v="$1"
    shift

    case "${v}" in
        *=*)
            # Exporting an expansion is *precisely* what we want here.
            # shellcheck disable=SC2163
            export ${v}
            ;;
        *)
            cmds="${cmds} ${v}"
            ;;
    esac
done

# Word splitting is desired here.
# shellcheck disable=SC2086
set -- ${cmds}

if [ $# -eq 1 ]; then
    cmd="$(echo "$1" | tr '-' '_')"
    ${cmd}
    exit $?
fi

SKETCH="$1"
shift

if [ "${SKETCH}" = "default" ]; then
    SKETCH="${DEFAULT_SKETCH}"
fi

cmds=""

# shellcheck disable=2034
for i in $(seq 1 $#); do
    cmds="${cmds} $(echo "$1" | tr '-' '_')"
    shift
done

LIBRARY="${SKETCH}"

export SKETCH
export LIBRARY

for cmd in ${cmds}; do
    ${cmd}
done