#
# Copyright (c) 2022 TUM Department of Electrical and Computer Engineering.
#
# This file is part of MLonMCU.
# See https://github.com/tum-ei-eda/mlonmcu.git for further info.
#
# 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.
#
"""Definition of tasks used to dynamically install MLonMCU dependencies"""

import os
from pathlib import Path
import multiprocessing

from mlonmcu.setup.task import TaskType
from mlonmcu.context.context import MlonMcuContext
from mlonmcu.setup import utils
from mlonmcu.logging import get_logger

from .common import get_task_factory

logger = get_logger()

Tasks = get_task_factory()


def _validate_tgc(context: MlonMcuContext, params=None):
    del params
    if not context.environment.has_target("tgc"):
        return False
    user_vars = context.environment.vars
    if "tgc.exe" in user_vars:  # TODO: also check command line flags?
        return False
    # assert "tgc" in context.environment.repos, "Undefined repository: 'tgc'"
    return True


def _validate_tgc_gen(context: MlonMcuContext, params=None):
    if not _validate_tgc(context, params=params):
        return False
    user_vars = context.environment.vars
    enable = user_vars.get("tgc.gen_enable", False)
    return enable


@Tasks.provides(["tgc.src_dir"])
@Tasks.validate(_validate_tgc)
@Tasks.register(category=TaskType.TARGET)
def clone_tgc(context: MlonMcuContext, params=None, rebuild=False, verbose=False, threads=multiprocessing.cpu_count()):
    """Clone the tgc simulator."""
    del params, verbose, threads
    tgcName = utils.makeDirName("tgc")
    tgcSrcDir = context.environment.paths["deps"].path / "src" / tgcName
    user_vars = context.environment.vars
    if "tgc.exe" in user_vars:  # TODO: also check command line flags?
        return False
    if rebuild or not utils.is_populated(tgcSrcDir):
        tgcRepo = context.environment.repos["tgc"]
        utils.clone_wrapper(tgcRepo, tgcSrcDir)

    context.cache["tgc.src_dir"] = tgcSrcDir


@Tasks.provides(["tgc_bsp.src_dir"])
@Tasks.validate(_validate_tgc)
@Tasks.register(category=TaskType.TARGET)
def clone_tgc_bsp(
    context: MlonMcuContext, params=None, rebuild=False, verbose=False, threads=multiprocessing.cpu_count()
):
    """Clone the tgc BSP."""
    del params, verbose, threads
    bspName = utils.makeDirName("tgc_bsp")
    bspSrcDir = context.environment.paths["deps"].path / "src" / bspName
    user_vars = context.environment.vars
    if "tgc_bsp.src_dir" in user_vars:  # TODO: also check command line flags?
        return False
    if rebuild or not utils.is_populated(bspSrcDir):
        bspRepo = context.environment.repos["tgc_bsp"]
        utils.clone_wrapper(bspRepo, bspSrcDir)

    context.cache["tgc_bsp.src_dir"] = bspSrcDir


@Tasks.provides(["tgc.gen_src_dir"])
@Tasks.validate(_validate_tgc_gen)
@Tasks.register(category=TaskType.TARGET)
def clone_tgc_gen(
    context: MlonMcuContext, params=None, rebuild=False, verbose=False, threads=multiprocessing.cpu_count()
):
    """Clone the tgc generator."""
    del params, verbose, threads
    tgcGenName = utils.makeDirName("tgc_gen")
    tgcGenSrcDir = context.environment.paths["deps"].path / "src" / tgcGenName
    # user_vars = context.environment.vars
    if rebuild or not utils.is_populated(tgcGenSrcDir):
        tgcGenRepo = context.environment.repos["tgc_gen"]
        utils.clone_wrapper(tgcGenRepo, tgcGenSrcDir)
    context.cache["tgc.gen_src_dir"] = tgcGenSrcDir


@Tasks.needs(["tgc.src_dir"])
@Tasks.optional(["tgc.gen_src_dir", "cmake.exe"])
@Tasks.validate(_validate_tgc)
@Tasks.provides(["tgc.build_dir", "tgc.exe"])
@Tasks.register(category=TaskType.TARGET)
def build_tgc(context: MlonMcuContext, params=None, rebuild=False, verbose=False, threads=multiprocessing.cpu_count()):
    # Build tgc simulator.
    if not params:
        params = {}
    user_vars = context.environment.vars
    gen_enable = user_vars.get("tgc.gen_enable", False)
    if "tgc.exe" in user_vars:  # TODO: also check command line flags?
        return False
    tgcName = utils.makeDirName("tgc")
    tgcSrcDir = context.cache["tgc.src_dir"]
    tgcBuildDir = context.environment.paths["deps"].path / "build" / tgcName
    tgcInstallDir = context.environment.paths["deps"].path / "install" / tgcName
    tgcExe = tgcInstallDir / "tgc-sim"
    user_vars = context.environment.vars
    cmake_exe = context.cache.get("cmake.exe")
    # backends = ["interp", "asmjit"]
    # versions = ["TGC5A", "TGC5B"]
    if "tgc.exe" in user_vars:  # TODO: also check command line flags?
        return False
    if rebuild or not (utils.is_populated(tgcBuildDir) and tgcExe.is_file()):
        # No need to build a vext and non-vext variant?
        utils.mkdirs(tgcBuildDir)
        if "tgc_gen" in context.environment.repos:
            utils.execute(
                "direnv allow",
                cwd=tgcSrcDir,
                shell=True,
                executable="/bin/bash",
            )
            if gen_enable:
                raise NotImplementedError
                # tgcGenSrcDir = context.cache["tgc.gen_src_dir"]
                # for backend in backends:
                #     for version in versions:
                #         cmd = f'/bin/bash -c "source ~/.sdkman/bin/sdkman-init.sh && sdk use java 11.0.21-tem && java
                # --version && {tgcSrcDir}/../tgc_gen/scripts/generate_iss.sh -c {version} -o dbt-rise-tgc/ -b {backend}
                # {tgcSrcDir}/../tgc_gen/CoreDSL/{version}.core_desc"'
                #         utils.execute(
                #             cmd,
                #             cwd=tgcSrcDir,
                #             shell=True,
                #         )
        env = os.environ.copy()
        if cmake_exe is not None:
            path_old = env.get("PATH")
            cmake_bin_dir = Path(cmake_exe).parent
            path_new = f"{cmake_bin_dir}:{path_old}"
            env["PATH"] = path_new
        utils.cmake(
            tgcSrcDir,
            cwd=tgcBuildDir,
            # debug=params["dbg"],
            env=env,
            live=verbose,
            cmake_exe=cmake_exe,
        )
        utils.make(cwd=tgcBuildDir, threads=threads, live=verbose)
        # TODO: install!
        # utils.make(target="install", cwd=spikeBuildDir, threads=threads, live=verbose)
        utils.mkdirs(tgcInstallDir)
        utils.move(tgcBuildDir / "dbt-rise-tgc" / "tgc-sim", tgcExe)
    context.cache["tgc.build_dir"] = tgcBuildDir
    context.cache["tgc.exe"] = tgcExe
