import subprocess
from itertools import dropwhile, takewhile
from enum import StrEnum

ADG_EXE = "HRB.Tools.CRA.CommandLine.exe"
ADG_DIR = "AutoDatabaseGenerator"


class StorageType(StrEnum):
    RANDOM = "random",
    SERIAL = "serial"


class AdgClient:
    def __init__(self, adg_exe: str, adg_dir: str):
        self.adg_exe = adg_exe
        self.adg_dir = adg_dir

    def _run(self, args: list[str]):
        return subprocess.run(["./"+self.adg_exe, *args],
                              cwd=self.adg_dir, capture_output=True)

    def set_system_name(self, name: str):
        self.system_name = name

    def get_databases(self):
        res = self._run(["ld"])
        if res.returncode > 0:
            raise Exception("Failed to get databases")

        res_lines = iter(str(res.stdout, encoding="utf-8").splitlines())
        skip_header = dropwhile(lambda x: "Started" not in x, res_lines)
        next(skip_header)  # Advance to one positon past the header

        skip_footer = takewhile(lambda x: "Completed" not in x, skip_header)

        return [x.replace("INFO|", "") for x in skip_footer]

    def create_database(self, name: str):
        res = self._run(["ccdb", "-u system", "-p oracle", f"-d {name}"])
        if res.returncode > 0:
            raise Exception("Failed to create database")

    def create_system(self, name: str = "", switch_ip: str = "",
                      host_name: str = ""):
        if not name:
            name = self.system_name

        extra_args = []
        if switch_ip:
            extra_args.append(f"-a {switch_ip}")
        if host_name:
            extra_args.append(f"-h {host_name}")

        res = self._run(["csd",
                         f"-n {name}",
                         f"-d {name}",
                         *extra_args])
        if res.returncode > 0:
            raise Exception("Failed to create system")

    def create_normal_resource(self, name: str,
                               location: int, envelope: int,
                               driver_path: str, package_path: str = "",
                               driver_description: str = "",
                               connection_parameters: str = "",
                               system: str = ""):
        if not (package_path or driver_description):
            raise Exception(
                "Either package path or driver description must be passed")
        if package_path and driver_description:
            raise Exception(
                "Package path and driver description are mutually exclusive")

        if not system:
            system = self.system_name

        extra_args = []

        if package_path:
            extra_args.append(f"-p {package_path}")
        elif driver_description:
            extra_args.append(f"-r {driver_description}")

        if connection_parameters:
            extra_args.append(f"-c {connection_parameters}")

        res = self._run(["cnr",
                         f"-s {system}",
                         f"-n {name}",
                         f"-l {location}",
                         f"-e {envelope}",
                         f"-d {driver_path}", *extra_args])
        if res.returncode > 0:
            raise Exception("Failed to add resource")

    def create_platehotel(self, name: str,
                          location: int, envelope: int,
                          system: str = "",
                          rows: int = -1,
                          type: StorageType = None):
        if not system:
            system = self.system_name

        res = self._run(["csr",
                         f"-s {system}",
                         f"-n {name}",
                         f"-l {location}",
                         f"-e {envelope}",
                         "-p platehotel"])
        if res.returncode > 0:
            raise Exception("Failed to create platehotel")

        if type and rows > 0:
            storage_res = self._run(["crs",
                                     f"-s {system}",
                                     f"-n {name}",
                                     f"-r {rows}",
                                     f"-t {type}"])
            if storage_res.returncode > 0:
                raise Exception("Failed to add storage to platehotel")

    def _create_unique_database_name(self, prefix: str) -> str:
        MAX_ATTEMPTS = 100
        databases = self.get_databases()
        for i in range(1, MAX_ATTEMPTS):
            potential = f"{prefix}{i}"
            if potential not in databases:
                return potential

    def create_unique_database(self, prefix: str) -> str:
        name = self._create_unique_database_name(prefix)
        self.create_database(name)
        return name