import itertools

from fbt.sdk.cache import LazySdkVersionLoader
from fbt.version import get_git_commit_unix_timestamp
from fbt_extra.util import link_elf_dir_as_latest, should_gen_cdb_and_link_dir
from SCons.Errors import UserError
from SCons.Node import FS

Import("ENV", "fw_build_meta")

# Building initial C environment for libs
env = ENV.Clone(
    tools=[
        ("compilation_db", {"COMPILATIONDB_COMSTR": "\tCDB\t${TARGET}"}),
        "fwbin",
        "fbt_apps",
        "pvsstudio",
        "fbt_hwtarget",
        "fbt_envhooks",
        "fbt_resources",
    ],
    COMPILATIONDB_USE_ABSPATH=False,
    COMPILATIONDB_USE_BINARY_ABSPATH=True,
    BUILD_DIR=fw_build_meta["build_dir"],
    IS_BASE_FIRMWARE=fw_build_meta["type"] == "firmware",
    FW_FLAVOR=fw_build_meta["flavor"],
    LIB_DIST_DIR=fw_build_meta["build_dir"].Dir("lib"),
    RESOURCES_ROOT=fw_build_meta["build_dir"].Dir("resources"),
    TARGETS_ROOT=Dir("#/targets"),
    LINT_SOURCES=[
        Dir("applications"),
    ],
    LIBPATH=[
        "${LIB_DIST_DIR}",
    ],
    CPPPATH=[
        "#/furi",
        *(f"#/{app_dir[0]}" for app_dir in ENV["APPDIRS"] if app_dir[1]),
        "#/targets/furi_hal_include",
    ],
    # Specific flags for building libraries - always do optimized builds
    FW_LIB_OPTS={
        "Default": {
            "CCFLAGS": [
                "-Og" if ENV["LIB_DEBUG"] else "-Os",
            ],
            "CPPDEFINES": [
                "NDEBUG",
                "FURI_DEBUG" if ENV["LIB_DEBUG"] else "FURI_NDEBUG",
            ],
            # You can add other entries named after libraries
            # If they are present, they have precedence over Default
        },
        # for furi_check to respect build type
        "furi": {
            "CCFLAGS": [
                "-Os",
            ],
            "CPPDEFINES": [
                "NDEBUG",
                "FURI_DEBUG" if ENV["DEBUG"] else "FURI_NDEBUG",
            ],
        },
        "flipper_application": {
            "CCFLAGS": [
                "-Og",
            ],
            "CPPDEFINES": [
                "NDEBUG",
                "FURI_DEBUG" if ENV["DEBUG"] else "FURI_NDEBUG",
            ],
        },
    },
    FW_API_TABLE=None,
    _APP_ICONS=None,
    APPS=_.split(",") if (_ := GetOption("extra_int_apps")) else [],
    EXTRA_EXT_APPS=_.split(",") if (_ := GetOption("extra_ext_apps")) else [],
)

env.PreConfigureFwEnvionment()

if env["IS_BASE_FIRMWARE"]:
    env.Append(
        FIRMWARE_BUILD_CFG="firmware",
        RAM_EXEC=False,
    )
else:
    env.Append(
        FIRMWARE_BUILD_CFG="updater",
        RAM_EXEC=True,
        CPPDEFINES=[
            "FURI_RAM_EXEC",
        ],
    )
env.AppendUnique(CPPDEFINES=["FW_CFG_${FIRMWARE_APP_SET}"])

env.ConfigureForTarget(env.subst("${TARGET_HW}"))

Export("env")

# Invoke child SCopscripts to populate global `env` + build their own part of the code
lib_targets = env.BuildModules(
    [
        "lib",
        "assets",
        "targets",
        "furi",
    ],
)

# Configure firmware origin definitions
env.Append(
    CPPDEFINES=[
        env.subst("FW_ORIGIN_${FIRMWARE_ORIGIN}"),
    ]
)


# Now, env is fully set up with everything to build apps
fwenv = env.Clone(FW_ARTIFACTS=[])

fw_artifacts = fwenv["FW_ARTIFACTS"]

# Set up additional app-specific build flags
SConscript("site_scons/firmwareopts.scons", exports={"ENV": fwenv})

# Set up app configuration
if env["IS_BASE_FIRMWARE"]:
    fwenv.Append(APPS=fwenv["FIRMWARE_APPS"].get(fwenv.subst("$FIRMWARE_APP_SET")))
else:
    fwenv.Append(APPS=["updater"])


for app_dir, _ in fwenv["APPDIRS"]:
    app_dir_node = env.Dir("#").Dir(app_dir)

    for entry in app_dir_node.glob("*"):
        if isinstance(entry, FS.Dir) and not str(entry).startswith("."):
            fwenv.LoadAppManifest(entry)

fwenv.PrepareApplicationsBuild()


# Build external apps + configure SDK
if env["IS_BASE_FIRMWARE"]:
    # Ensure all libs are built - even if they are not used in firmware
    fw_artifacts.append(fwenv["LIB_DIST_DIR"].glob("*.a"))

    fwenv.SetDefault(FBT_FAP_DEBUG_ELF_ROOT=fwenv["BUILD_DIR"].Dir(".extapps"))
    fw_extapps = fwenv["FW_EXTAPPS"] = SConscript(
        "site_scons/extapps.scons",
        exports={"ENV": fwenv},
    )
    fw_artifacts.append(fw_extapps.sdk_tree)

    # Resources & manifest for SD card
    manifest = fwenv.ManifestBuilder(
        "${RESOURCES_ROOT}/Manifest",
        GIT_UNIX_TIMESTAMP=get_git_commit_unix_timestamp(),
        _EXTRA_DIST=[fwenv["DOLPHIN_EXTERNAL_OUT_DIR"]],
    )
    fwenv.Replace(FW_RESOURCES_MANIFEST=manifest)
    fwenv.Alias("resources", manifest)

    # API getter
    fwenv.Append(FBT_API_VERSION=LazySdkVersionLoader(fwenv.subst("$SDK_DEFINITION")))
    fwenv.PhonyTarget(
        "get_apiversion",
        "@echo $( ${FBT_API_VERSION} $)",
    )

# Add preprocessor definitions for current set of apps
fwenv.Append(
    CPPDEFINES=fwenv["APPBUILD"].get_apps_cdefs(),
)

# Build applications.c for selected services & apps
# Depends on virtual value-only node, so it only gets rebuilt when set of apps changes
apps_c = fwenv.ApplicationsC(
    "applications/applications.c",
    [Value(fwenv["APPS"]), Value(fwenv["LOADER_AUTOSTART"])],
)

# Adding dependency on manifest files so apps.c is rebuilt when any manifest is changed
for app_dir, _ in env["APPDIRS"]:
    app_dir_node = env.Dir("#").Dir(app_dir)
    fwenv.Depends(apps_c, app_dir_node.glob("*/application.fam"))

# Sanity check - certain external apps are using features that are not available in base firmware
if advanced_faps := list(
    filter(
        lambda app: app.fap_extbuild or app.fap_private_libs or app.fap_icon_assets,
        fwenv["APPBUILD"].get_builtin_apps(),
    )
):
    raise UserError(
        "An Application that is using fap-specific features cannot be built into base firmware."
        f" Offending app(s): {', '.join(app.appid for app in advanced_faps)}"
    )

sources = [apps_c]
# Gather sources only from app folders in current configuration
sources.extend(
    itertools.chain.from_iterable(
        fwenv.GatherSources([source_type, "!lib"], appdir.relpath)
        for appdir, source_type in fwenv["APPBUILD"].get_builtin_app_folders()
    )
)

# Debug
# print(fwenv.Dump())

# Full firmware definition
fwelf = fwenv["FW_ELF"] = fwenv.Program(
    "${FIRMWARE_BUILD_CFG}",
    sources,
    LIBS=fwenv["TARGET_CFG"].linker_dependencies,
)
Depends(fwelf, fwenv["LINKER_SCRIPT_PATH"])

# Firmware depends on everything child builders returned
# Depends(fwelf, lib_targets)
# Output extra details after building firmware
AddPostAction(fwelf, fwenv["APPBUILD_DUMP"])
AddPostAction(
    fwelf,
    Action(
        [["${PYTHON3}", "${BIN_SIZE_SCRIPT}", "elf", "${TARGET}"]],
        "Firmware size",
    ),
)

# Produce extra firmware files
fwhex = fwenv["FW_HEX"] = fwenv.HEXBuilder("${FIRMWARE_BUILD_CFG}")
fwbin = fwenv["FW_BIN"] = fwenv.BINBuilder("${FIRMWARE_BUILD_CFG}")
AddPostAction(
    fwbin,
    Action([["@${PYTHON3}", "${BIN_SIZE_SCRIPT}", "bin", "${TARGET}"]]),
)

fwdfu = fwenv["FW_DFU"] = fwenv.DFUBuilder("${FIRMWARE_BUILD_CFG}")
Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_dfu", fwdfu)

fwdump = fwenv.ObjDump("${FIRMWARE_BUILD_CFG}")
Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_list", fwdump)


fw_artifacts.extend(
    [
        fwhex,
        fwbin,
        fwdfu,
        fwenv["FW_VERSION_JSON"],
    ]
)


fwcdb = fwenv["FW_CDB"] = fwenv.CompilationDatabase()
# without filtering, both updater & firmware commands would be generated in same file
fwenv.Replace(
    COMPILATIONDB_PATH_FILTER=fwenv.subst("*${FW_FLAVOR}*"),
    COMPILATIONDB_SRCPATH_FILTER="*.c*",
)
AlwaysBuild(fwcdb)
Precious(fwcdb)
NoClean(fwcdb)
Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_cdb", fwcdb)

pvscheck = fwenv.PVSCheck("pvsreport.log", fwcdb)
Depends(
    pvscheck,
    [
        fwenv["FW_VERSION_JSON"],
        fwenv["FW_ASSETS_HEADERS"],
        fwenv["FW_API_TABLE"],
        fwenv["_APP_ICONS"],
    ],
)
Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_pvscheck", pvscheck)
AlwaysBuild(pvscheck)
Precious(pvscheck)

pvsreport = fwenv.PVSReport(None, pvscheck, REPORT_DIR=Dir("pvsreport"))
Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_pvs", pvsreport)
AlwaysBuild(pvsreport)

# If current configuration was explicitly requested, generate compilation database
# and link its directory as build/latest
if should_gen_cdb_and_link_dir(fwenv, BUILD_TARGETS):
    fw_artifacts.append(fwcdb)

    # Adding as a phony target, so folder link is updated even if elf didn't change
    link_dir_command = fwenv.PhonyTarget(
        fwenv.subst("${FIRMWARE_BUILD_CFG}_latest"),
        Action(
            lambda source, target, env: link_elf_dir_as_latest(env, source[0]),
            None,
        ),
        source=fwelf,
    )
    fw_artifacts.append(link_dir_command)

Alias(fwenv["FIRMWARE_BUILD_CFG"] + "_all", fw_artifacts)

env.PostConfigureFwEnvionment()

Return("fwenv")