#!/usr/bin/python
"""Iterate through KConfig options, enabling them one by one."""
import argparse
import pathlib
import re
import subprocess
import sys
import termcolor
import typing

parser = argparse.ArgumentParser()
parser.add_argument("-q", "--quick", action="store_true", dest="quick",
                    help="Only compile the subdirectory "
                         "containing the Kconfig file")
parser.add_argument("kconfig", metavar="Kconfig", nargs=1,
                    help="Path to Kconfig file")
parser.add_argument("makeargs", metavar="Make Arguments", nargs="*",
                    help="Options to pass to make")

Args = parser.parse_args()
Kconfig = pathlib.Path(Args.kconfig[0])
Config = pathlib.Path("scripts/config").absolute()
Make = pathlib.Path("~/.local/bin/makelinux.zsh").expanduser()
MakeArg = Args.makeargs + ([f"{str(Kconfig)}/"] if Args.quick else [])
Options = dict()
Colors = {"n": "dark_grey", "y": "green", "m": "cyan"}
Attrs = {"y": ["bold"], "m": ["bold"]}
NameLen = 0

if Kconfig.is_dir():
    Kconfig = Kconfig / "Kconfig"


for path in [Kconfig, Make, Config]:
    if not path.exists():
        print(f"Error: {path} does not exist!")
        sys.exit(1)


class Option:
    """Represents a single CONFIG_* KConfig Option."""

    def __init__(self, opt: str):
        """Initialize our Option class."""
        lines = opt.splitlines()
        self.name = lines[0].strip()
        self.type = lines[1].strip().split()[0]
        self.state = "y"
        self.res = None

        if search := re.search(r"\sdepends on (.*?)\n", opt):
            depends = search.group(1).strip()
            depends = [d.strip() for d in re.split("[&&|=m|=y|=n]", depends)]
            self.depends = set([d for d in depends if len(d) > 0])
        else:
            self.depends = set()

    def __repr__(self) -> str:
        """Return a string representation of this Option."""
        return f"{self.name}:{self.type}"

    def __lt__(self, rhs: typing.Self) -> bool:
        """Check if this option is less than the `rhs` option."""
        if self.name.endswith("DEBUG"):
            return False
        if rhs.name.endswith("DEBUG"):
            return True
        return self.name in rhs.dependencies()

    def dependencies(self) -> set[typing.Self]:
        """Get a set of dependencies for this Option."""
        ret = self.depends.copy()
        for dep in self.depends:
            if (opt := Options.get(dep)) is not None:
                ret.update(opt.dependencies())
        return ret

    def disable(self) -> None:
        """Disable this Option."""
        subprocess.run([Config] + ["--disable", self.name]).check_returncode()
        self.state = "n"

    def enable(self) -> None:
        """Enable this Option."""
        how = "--module" if self.type == "tristate" else "--enable"
        subprocess.run([Config] + [how, self.name]).check_returncode()
        self.state = "m" if self.type == "tristate" else "y"

    def print(self) -> None:
        """Print out this option (in color!)."""
        print("  ", end="")
        termcolor.cprint(self.name, Colors.get(self.state),
                         attrs=["bold", "dark"], end="")
        termcolor.cprint("=", "white", attrs=["bold"], end="")
        termcolor.cprint(self.state, Colors.get(self.state),
                         attrs=["bold", "dark"])

    def print_result(self) -> None:
        """Print out this option and result."""
        attrs = [] if self.res is None else ["bold"]

        match self.res:
            case True: result = ("Success", "green")
            case False: result = ("Failed", "red")
            case _: result = ("Not Run", "yellow")

        termcolor.cprint("  " + self.name + " ", Colors.get(self.state),
                         attrs=attrs, end="")
        termcolor.cprint(" " * (NameLen - len(self.name)), "grey",
                         attrs=["underline"], end="")
        termcolor.cprint(" " + result[0], result[1], attrs=attrs)


with open(Kconfig) as f:
    regex = re.compile("\nconfig")
    opts = [Option(opt) for opt in regex.split(f.read()) if opt[0] != "#"]
    Options = {opt.name: opt for opt in opts
               if opt.type in ["bool", "tristate"]}

options = list(sorted(Options.values()))


def make_opt(option: Option) -> None:
    """Enable and build a single option."""
    option.enable()

    print()
    for o in options:
        o.print()

    option.res = False
    subprocess.run([Make] + ["olddefconfig"]).check_returncode()
    subprocess.run([Make] + MakeArg).check_returncode()
    option.res = True


try:
    for opt in options:
        NameLen = max(NameLen, len(opt.name) + 2)
        opt.disable()
    for opt in options:
        make_opt(opt)
except Exception as e:
    print(str(e))
finally:
    print()
    termcolor.cprint("Kconfig Results:", "yellow", attrs=["bold", "underline"])
    for opt in options:
        opt.print_result()
    if False in [opt.res for opt in options]:
        sys.exit(1)