from threading import Thread
from typing import Set, List, Tuple

from bauh.gems.arch import pacman
from bauh.gems.arch.aur import AURClient


class DependenciesAnalyser:

    def __init__(self, aur_client: AURClient):
        self.aur_client = aur_client

    def _fill_mirror(self, name: str, output: List[Tuple[str, str]]):

        mirror = pacman.read_repository_from_info(name)

        if mirror:
            output.append((name, mirror))
            return

        guess = pacman.guess_repository(name)

        if guess:
            output.append(guess)
            return

        aur_info = self.aur_client.get_src_info(name)

        if aur_info:
            output.append((name, 'aur'))
            return

        output.append((name, ''))

    def get_missing_packages(self, names: Set[str], mirror: str = None, in_analysis: Set[str] = None) -> List[Tuple[str, str]]:
        """
        :param names:
        :param mirror:
        :param in_analysis: global set storing all names in analysis to avoid repeated recursion
        :return:
        """
        global_in_analysis = in_analysis if in_analysis else set()

        missing_names = pacman.check_missing({n for n in names if n not in in_analysis})

        if missing_names:
            missing_root = []
            threads = []

            if not mirror:
                for name in missing_names:
                    t = Thread(target=self._fill_mirror, args=(name, missing_root))
                    t.start()
                    threads.append(t)

                for t in threads:
                    t.join()

                threads.clear()

                # checking if there is any unknown dependency:
                for rdep in missing_root:
                    if not rdep[1]:
                        return missing_root
                    else:
                        global_in_analysis.add(rdep[0])
            else:
                for missing in missing_names:
                    missing_root.append((missing, mirror))
                    global_in_analysis.add(missing)

            missing_sub = []
            for rdep in missing_root:
                subdeps = self.aur_client.get_all_dependencies(rdep[0]) if rdep[1] == 'aur' else pacman.read_dependencies(rdep[0])
                subdeps_not_analysis = {sd for sd in subdeps if sd not in global_in_analysis}

                if subdeps_not_analysis:
                    missing_subdeps = self.get_missing_packages(subdeps_not_analysis, in_analysis=global_in_analysis)

                    # checking if there is any unknown:
                    if missing_subdeps:
                        for subdep in missing_subdeps:
                            if not subdep[0]:
                                return [*missing_subdeps, *missing_root]

                            if subdep[0] not in missing_names:
                                missing_sub.append(subdep)
            return [*missing_sub, *missing_root]

    def get_missing_subdeps_of(self, names: Set[str], mirror: str) -> List[Tuple[str, str]]:
        missing = []
        already_added = {*names}
        in_analyses = {*names}

        for name in names:
            subdeps = self.aur_client.get_all_dependencies(name) if mirror == 'aur' else pacman.read_dependencies(name)

            if subdeps:
                missing_subdeps = self.get_missing_packages(subdeps, in_analysis=in_analyses)

                if missing_subdeps:
                    for subdep in missing_subdeps:  # checking if there is any unknown:
                        if subdep[0] not in already_added:
                            missing.append(subdep)

                        if not subdep[0]:
                            return missing
        return missing