# Copyright 2014-present PlatformIO <contact@platformio.org>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""
Espressif IDF

Espressif IoT Development Framework for ESP32 MCU

https://github.com/espressif/esp-idf
"""

import sys
from os import listdir, makedirs
from os.path import isdir, join

from SCons.Script import DefaultEnvironment

from platformio.util import exec_command

env = DefaultEnvironment()
platform = env.PioPlatform()

FRAMEWORK_DIR = platform.get_package_dir("framework-espidf")
FRAMEWORK_VERSION = platform.get_package_version(
    "framework-espidf")
assert isdir(FRAMEWORK_DIR)


def build_espidf_bootloader():
    envsafe = env.Clone()
    framework_dir = env.subst("$ESPIDF_DIR")
    envsafe.Replace(
        CPPDEFINES=["ESP_PLATFORM", "BOOTLOADER_BUILD=1"],

        LIBPATH=[
            join(framework_dir, "components", "esp32", "ld"),
            join(framework_dir, "components", "bootloader", "src", "main")
        ],

        LINKFLAGS=[
            "-Os",
            "-nostdlib",
            "-Wl,-static",
            "-u", "call_user_start_cpu0",
            "-Wl,-static",
            "-Wl,--gc-sections",
            "-T", "esp32.bootloader.ld",
            "-T", "esp32.rom.ld"
        ]
    ),

    envsafe.Append(CCFLAGS=["-fstrict-volatile-bitfields"])

    envsafe.Replace(
        LIBS=[
            envsafe.BuildLibrary(
                join("$BUILD_DIR", "bootloaderLog"),
                join(framework_dir, "components", "log")
            ), "gcc"
        ]
    )

    return envsafe.Program(
        join("$BUILD_DIR", "bootloader.elf"),
        envsafe.CollectBuildFiles(
            join("$BUILD_DIR", "bootloader"),
            join(framework_dir, "components", "bootloader", "src", "main")
        )
    )

env.Prepend(
    CPPPATH=[
        join("$PROJECTSRC_DIR"),
        join(FRAMEWORK_DIR, "components", "nghttp", "include"),
        join(FRAMEWORK_DIR, "components", "nghttp", "port", "include"),
        join(FRAMEWORK_DIR, "components", "bt", "include"),
        join(FRAMEWORK_DIR, "components", "driver", "include"),
        join(FRAMEWORK_DIR, "components", "esp32", "include"),
        join(FRAMEWORK_DIR, "components", "freertos", "include"),
        join(FRAMEWORK_DIR, "components", "freertos", "include", "freertos"),
        join(FRAMEWORK_DIR, "components", "log", "include"),
        join(FRAMEWORK_DIR, "components", "newlib", "include"),
        join(FRAMEWORK_DIR, "components", "nvs_flash", "include"),
        join(FRAMEWORK_DIR, "components", "spi_flash", "include"),
        join(FRAMEWORK_DIR, "components", "tcpip_adapter", "include"),
        join(FRAMEWORK_DIR, "components", "lwip", "include", "lwip"),
        join(FRAMEWORK_DIR, "components", "lwip", "include", "lwip", "port"),
        join(FRAMEWORK_DIR, "components", "lwip", "include", "lwip", "posix"),
        join(FRAMEWORK_DIR, "components", "expat", "include", "expat"),
        join(FRAMEWORK_DIR, "components", "expat", "port", "include"),
        join(FRAMEWORK_DIR, "components", "json", "include"),
        join(FRAMEWORK_DIR, "components", "json", "port", "include"),
        join(FRAMEWORK_DIR, "components", "mbedtls", "include"),
        join(FRAMEWORK_DIR, "components", "mbedtls", "port", "include")
    ],

    LIBPATH=[
        join(FRAMEWORK_DIR, "components", "esp32"),
        join(FRAMEWORK_DIR, "components", "esp32", "ld"),
        join(FRAMEWORK_DIR, "components", "esp32", "lib"),
        join(FRAMEWORK_DIR, "components", "bt", "lib"),
        join(FRAMEWORK_DIR, "components", "newlib", "lib"),
        "$BUILD_DIR"
    ],

    LIBS=[
        "hal", "crypto", "core", "net80211", "phy", "rtc", "pp", "wpa",
        "smartconfig", "btdm_app", "m", "c", "gcc"
    ]
)

env.Append(
    LIBSOURCE_DIRS=[
        join(FRAMEWORK_DIR, "libraries")
    ],

    LINKFLAGS=[
        "-T", "esp32.common.ld",
        "-T", "esp32.rom.ld",
        "-T", "esp32.peripherals.ld"
    ],
)

#
# Generate partition table
#

partition_table = env.Command(
    join(env.subst("$BUILD_DIR"), "partitions_table.bin"),
    join("$ESPIDF_DIR", "components",
         "partition_table", "partitions_singleapp.csv"),
    '"$PYTHONEXE" "%s" -q $SOURCE $TARGET' % join(
        "$ESPIDF_DIR", "components", "partition_table", "gen_esp32part.py")
)

env.Depends("$BUILD_DIR/$PROGNAME$PROGSUFFIX", partition_table)


#
# Generate linker script
#

linker_script = env.Command(
    join("$BUILD_DIR", "esp32_out.ld"),
    join("$ESPIDF_DIR", "components", "esp32", "ld", "esp32.ld"),
    "$CC -I$PROJECTSRC_DIR -C -P -x  c -E $SOURCE -o $TARGET"
)

env.Depends("$BUILD_DIR/$PROGNAME$PROGSUFFIX", linker_script)

#
# Compile bootloader
#

env.Depends("$BUILD_DIR/$PROGNAME$PROGSUFFIX", env.ElfToBin(
    join("$BUILD_DIR", "bootloader"), build_espidf_bootloader()))

#
# Target: Build Core Library
#

libs = []

ignore_dirs = (
    "bootloader", "esptool_py", "idf_test", "newlib", "partition_table")

for d in listdir(join(FRAMEWORK_DIR, "components")):
    if d in ignore_dirs:
        continue
    if isdir(join(FRAMEWORK_DIR, "components", d)):
        libs.append(env.BuildLibrary(
            join("$BUILD_DIR", "%s" % d),
            join(FRAMEWORK_DIR, "components", d),
            src_filter="+<*> -<test>"
        ))

env.Prepend(LIBS=libs)