# Copyright (C) Ivan Kravets <me@ikravets.com>
# See LICENSE for details.

"""
    Builder for Teensy boards
"""

from os.path import join

from SCons.Script import (COMMAND_LINE_TARGETS, AlwaysBuild, Builder, Default,
                          DefaultEnvironment)


env = DefaultEnvironment()

if env.get("BOARD_OPTIONS", {}).get("build", {}).get("core") == "teensy":
    env.Replace(
        AR="avr-ar",
        AS="avr-gcc",
        CC="avr-gcc",
        CXX="avr-g++",
        OBJCOPY="avr-objcopy",
        RANLIB="avr-ranlib",

        ARFLAGS=["rcs"],

        CXXFLAGS=[
            "-std=c++0x"
        ],

        CPPFLAGS=[
            "-mmcu=$BOARD_MCU"
        ],

        CPPDEFINES=[
            "SERIALNUM=-1164905212"  # ?????
        ],

        LINKFLAGS=[
            "-mmcu=$BOARD_MCU"
        ]
    )

elif env.get("BOARD_OPTIONS", {}).get("build", {}).get("core") == "teensy3":
    env.Replace(
        AR="arm-none-eabi-ar",
        AS="arm-none-eabi-gcc",
        CC="arm-none-eabi-gcc",
        CXX="arm-none-eabi-g++",
        OBJCOPY="arm-none-eabi-objcopy",
        RANLIB="arm-none-eabi-ranlib",

        ARFLAGS=["rcs"],

        ASFLAGS=[
            "-mcpu=cortex-m4",
            "-mthumb",
            #"-nostdlib"
        ],

        CXXFLAGS=[
            "-std=gnu++0x",
            "-fno-rtti",
        ],

        CPPFLAGS=[
            "-mcpu=cortex-m4",
            "-mthumb",
            "-ffunction-sections",  # place each function in its own section
            "-fdata-sections",
            #"-nostdlib"
        ],

        CPPDEFINES=[
            "TIME_T=1423046159"  # @TODO
        ],

        LINKFLAGS=[
            "-mcpu=cortex-m4",
            "-mthumb",
            "-Wl,--gc-sections",
            #"-nostartfiles",
            #"-nostdlib",
        ]
    )

env.Append(
    BUILDERS=dict(
        ElfToEep=Builder(
            action=" ".join([
                "$OBJCOPY",
                "-O",
                "ihex",
                "-j",
                ".eeprom",
                '--set-section-flags=.eeprom="alloc,load"',
                "--no-change-warnings",
                "--change-section-lma",
                ".eeprom=0",
                "$SOURCES",
                "$TARGET"]),
            suffix=".eep"
        ),

        ElfToHex=Builder(
            action=" ".join([
                "$OBJCOPY",
                "-O",
                "ihex",
                "-R",
                ".eeprom",
                "$SOURCES",
                "$TARGET"]),
            suffix=".hex"
        )
    ),

    ASFLAGS=[
        "-c",
        "-g",  # include debugging info (so errors include line numbers)
        "-x", "assembler-with-cpp",
        "-Wall"
    ],

    CPPFLAGS=[
        "-g",   # include debugging info (so errors include line numbers)
        "-Os",  # optimize for size
        "-fdata-sections",
        "-ffunction-sections",  # place each function in its own section
        "-Wall",
        "-MMD"  # output dependancy info
    ],

    CPPDEFINES=[
        "F_CPU=$BOARD_F_CPU",
        "USB_VID=null",
        "USB_PID=null",
        "USB_VID=null",
        "TEENSYDUINO=120",
        "USB_SERIAL",
        "LAYOUT_US_ENGLISH",
        "__MK20DX256__"
    ],

    CXXFLAGS=[
        "-felide-constructors",
        "-fno-exceptions"
    ],

    LINKFLAGS=[
        "-Os"
    ],

    UPLOADER=join(
        "$PIOPACKAGES_DIR", "tool-teensy", "teensy_loader_cli"),
    UPLOADERFLAGS=[

    ],
    UPLOADHEXCMD='"$UPLOADER" $UPLOADERFLAGS -U flash:w:$SOURCES:i',
    UPLOADEEPCMD='"$UPLOADER" $UPLOADERFLAGS -U eeprom:w:$SOURCES:i'
)

CORELIBS = env.ProcessGeneral()

#
# Target: Build executable and linkable firmware
#

target_elf = env.BuildFirmware(CORELIBS + ["m"])

#
# Target: Extract EEPROM data (from EEMEM directive) to .eep file
#

target_eep = env.Alias("eep", env.ElfToEep(join("$BUILD_DIR", "firmware"),
                                           target_elf))

#
# Target: Build the .hex file
#

if "uploadlazy" in COMMAND_LINE_TARGETS:
    target_hex = join("$BUILD_DIR", "firmware.hex")
else:
    target_hex = env.ElfToHex(join("$BUILD_DIR", "firmware"), target_elf)

#
# Target: Upload by default .hex file
#

upload = env.Alias(["upload", "uploadlazy"], target_hex, ("$UPLOADCMD"))
AlwaysBuild(upload)

#
# Target: Upload .eep file
#

uploadeep = env.Alias(["uploadeep"], target_eep, ("$UPLOADEEPCMD"))
AlwaysBuild(uploadeep)

#
# Target: Define targets
#

Default(target_hex)