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import os
from contextlib import contextmanager
from functools import wraps
from itertools import chain

from dvc.ignore import CleanTree
from dvc.compat import fspath_py35

from funcy import cached_property, cat

from dvc.config import Config
from dvc.exceptions import (
from dvc.path_info import PathInfo
from dvc.remote.base import RemoteActionNotImplemented
from dvc.utils.fs import path_isin
from .graph import check_acyclic, get_pipeline, get_pipelines

def locked(f):
    def wrapper(repo, *args, **kwargs):
        with repo.lock, repo.state:
            ret = f(repo, *args, **kwargs)
            # Our graph cache is no longer valid after we release the repo.lock
            return ret

    return wrapper

class Repo(object):
    DVC_DIR = ".dvc"

    from dvc.repo.destroy import destroy
    from dvc.repo.install import install
    from dvc.repo.add import add
    from dvc.repo.remove import remove
    from import ls
    from dvc.repo.lock import lock as lock_stage
    from dvc.repo.move import move
    from import run
    from dvc.repo.imp import imp
    from dvc.repo.imp_url import imp_url
    from dvc.repo.reproduce import reproduce
    from dvc.repo.checkout import _checkout
    from dvc.repo.push import push
    from dvc.repo.fetch import _fetch
    from dvc.repo.pull import pull
    from dvc.repo.status import status
    from dvc.repo.gc import gc
    from dvc.repo.commit import commit
    from dvc.repo.diff import diff
    from dvc.repo.brancher import brancher
    from dvc.repo.get import get
    from dvc.repo.get_url import get_url
    from dvc.repo.update import update

    def __init__(self, root_dir=None):
        from dvc.state import State
        from dvc.lock import make_lock
        from dvc.scm import SCM
        from dvc.cache import Cache
        from dvc.data_cloud import DataCloud
        from dvc.repo.metrics import Metrics
        from dvc.scm.tree import WorkingTree
        from dvc.repo.tag import Tag
        from dvc.utils.fs import makedirs

        root_dir = self.find_root(root_dir)

        self.root_dir = os.path.abspath(os.path.realpath(root_dir))
        self.dvc_dir = os.path.join(self.root_dir, self.DVC_DIR)

        self.config = Config(self.dvc_dir)

        self.scm = SCM(self.root_dir)

        self.tree = WorkingTree(self.root_dir)

        self.tmp_dir = os.path.join(self.dvc_dir, "tmp")
        makedirs(self.tmp_dir, exist_ok=True)

        hardlink_lock = self.config["core"].get("hardlink_lock", False)
        self.lock = make_lock(
            os.path.join(self.dvc_dir, "lock"),
            tmp_dir=os.path.join(self.dvc_dir, "tmp"),

        # NOTE: storing state and link_state in the repository itself to avoid
        # any possible state corruption in 'shared cache dir' scenario.
        self.state = State(self)

        self.cache = Cache(self) = DataCloud(self)

        self.metrics = Metrics(self)
        self.tag = Tag(self)


    def tree(self):
        return self._tree

    def tree(self, tree):
        self._tree = tree if isinstance(tree, CleanTree) else CleanTree(tree)
        # Our graph cache is no longer valid, as it was based on the previous
        # tree.

    def __repr__(self):
        return "{}: '{}'".format(self.__class__.__name__, self.root_dir)

    def find_root(cls, root=None):
        root_dir = os.path.realpath(root or os.curdir)

        if not os.path.isdir(root_dir):
            raise NotDvcRepoError("directory '{}' does not exist".format(root))

        while True:
            dvc_dir = os.path.join(root_dir, cls.DVC_DIR)
            if os.path.isdir(dvc_dir):
                return root_dir
            if os.path.ismount(root_dir):
            root_dir = os.path.dirname(root_dir)

        message = (
            "you are not inside of a DVC repository "
            "(checked up to mount point '{}')"
        raise NotDvcRepoError(message)

    def find_dvc_dir(cls, root=None):
        root_dir = cls.find_root(root)
        return os.path.join(root_dir, cls.DVC_DIR)

    def init(root_dir=os.curdir, no_scm=False, force=False):
        from dvc.repo.init import init

        init(root_dir=root_dir, no_scm=no_scm, force=force)
        return Repo(root_dir)

    def unprotect(self, target):
        return self.cache.local.unprotect(PathInfo(target))

    def _ignore(self):
        from dvc.updater import Updater

        updater = Updater(self.dvc_dir)

        flist = (
            [self.config.files["local"], updater.updater_file]
            + [self.lock.lockfile, updater.lock.lockfile, self.tmp_dir]
            + self.state.files

        if path_isin(self.cache.local.cache_dir, self.root_dir):
            flist += [self.cache.local.cache_dir]


    def check_modified_graph(self, new_stages):
        """Generate graph including the new stage to check for errors"""
        self._collect_graph(self.stages + new_stages)

    def collect(self, target, with_deps=False, recursive=False, graph=None):
        import networkx as nx
        from dvc.stage import Stage

        G = graph or self.graph

        if not target:
            return list(G)

        target = os.path.abspath(target)

        if recursive and os.path.isdir(target):
            stages = nx.dfs_postorder_nodes(G)
            return [stage for stage in stages if path_isin(stage.path, target)]

        stage = Stage.load(self, target)
        if not with_deps:
            return [stage]

        pipeline = get_pipeline(get_pipelines(G), stage)
        return list(nx.dfs_postorder_nodes(pipeline, stage))

    def collect_granular(self, target, *args, **kwargs):
        if not target:
            return [(stage, None) for stage in self.stages]

            (out,) = self.find_outs_by_path(target, strict=False)
            filter_info = PathInfo(os.path.abspath(target))
            return [(out.stage, filter_info)]
        except OutputNotFoundError:
            stages = self.collect(target, *args, **kwargs)
            return [(stage, None) for stage in stages]

    def used_cache(
        """Get the stages related to the given target and collect
        the `info` of its outputs.

        This is useful to know what files from the cache are _in use_
        (namely, a file described as an output on a stage).

        The scope is, by default, the working directory, but you can use
        `all_branches` or `all_tags` to expand scope.

            A dictionary with Schemes (representing output's location) as keys,
            and a list with the outputs' `dumpd` as values.
        from dvc.cache import NamedCache

        cache = NamedCache()

        for branch in self.brancher(
            targets = targets or [None]

            pairs = cat(
                    target, recursive=recursive, with_deps=with_deps
                for target in targets

            suffix = "({})".format(branch) if branch else ""
            for stage, filter_info in pairs:
                used_cache = stage.get_used_cache(
                cache.update(used_cache, suffix=suffix)

        return cache

    def _collect_graph(self, stages=None):
        """Generate a graph by using the given stages on the given directory

        The nodes of the graph are the stage's path relative to the root.

        Edges are created when the output of one stage is used as a
        dependency in other stage.

        The direction of the edges goes from the stage to its dependency:

        For example, running the following:

            $ dvc run -o A "echo A > A"
            $ dvc run -d A -o B "echo B > B"
            $ dvc run -d B -o C "echo C > C"

        Will create the following graph:

               ancestors <--
                C.dvc -> B.dvc -> A.dvc
                |          |
                |          --> descendants
                ------- pipeline ------>
              (weakly connected components)

            stages (list): used to build a graph, if None given, collect stages
                in the repository.

            OutputDuplicationError: two outputs with the same path
            StagePathAsOutputError: stage inside an output directory
            OverlappingOutputPathsError: output inside output directory
            CyclicGraphError: resulting graph has cycles
        import networkx as nx
        from dvc.exceptions import (

        G = nx.DiGraph()
        stages = stages or self.stages
        stages = [stage for stage in stages if stage]
        outs = {}

        for stage in stages:
            for out in stage.outs:
                if out.path_info in outs:
                    dup_stages = [stage, outs[out.path_info].stage]
                    raise OutputDuplicationError(str(out), dup_stages)
                outs[out.path_info] = out

        for stage in stages:
            for out in stage.outs:
                for p in out.path_info.parents:
                    if p in outs:
                        msg = (
                            "Paths for outs:\n'{}'('{}')\n'{}'('{}')\n"
                            "overlap. To avoid unpredictable behaviour, "
                            "rerun command with non overlapping outs paths."
                        raise OverlappingOutputPathsError(outs[p], out, msg)

        for stage in stages:
            stage_path_info = PathInfo(stage.path)
            for p in chain([stage_path_info], stage_path_info.parents):
                if p in outs:
                    raise StagePathAsOutputError(stage, str(outs[p]))

        for stage in stages:

            for dep in stage.deps:
                if dep.path_info is None:

                for out_path_info, out in outs.items():
                    if out_path_info.overlaps(dep.path_info):
                        G.add_edge(stage, out.stage)


        return G

    def graph(self):
        return self._collect_graph()

    def pipelines(self):
        return get_pipelines(self.graph)

    def stages(self):
        Walks down the root directory looking for Dvcfiles,
        skipping the directories that are related with
        any SCM (e.g. `.git`), DVC itself (`.dvc`), or directories
        tracked by DVC (e.g. `dvc add data` would skip `data/`)

        NOTE: For large repos, this could be an expensive
              operation. Consider using some memoization.
        from dvc.stage import Stage

        stages = []
        outs = set()

        for root, dirs, files in self.tree.walk(self.root_dir):
            for fname in files:
                path = os.path.join(root, fname)
                if not Stage.is_valid_filename(path):
                stage = Stage.load(self, path)

                for out in stage.outs:
                    if out.scheme == "local":

            dirs[:] = [d for d in dirs if os.path.join(root, d) not in outs]

        return stages

    def find_outs_by_path(self, path, outs=None, recursive=False, strict=True):
        if not outs:
            outs = [out for stage in self.stages for out in stage.outs]

        abs_path = os.path.abspath(path)
        path_info = PathInfo(abs_path)
        match = path_info.__eq__ if strict else path_info.isin_or_eq

        def func(out):
            if out.scheme == "local" and match(out.path_info):
                return True

            if recursive and out.path_info.isin(path_info):
                return True

            return False

        matched = list(filter(func, outs))
        if not matched:
            raise OutputNotFoundError(path, self)

        return matched

    def find_out_by_relpath(self, relpath):
        path = os.path.join(self.root_dir, relpath)
        (out,) = self.find_outs_by_path(path)
        return out

    def is_dvc_internal(self, path):
        path_parts = os.path.normpath(path).split(os.path.sep)
        return self.DVC_DIR in path_parts

    def open_by_relpath(self, path, remote=None, mode="r", encoding=None):
        """Opens a specified resource as a file descriptor"""
        cause = None
            out = self.find_out_by_relpath(path)
        except OutputNotFoundError as exc:
            out = None
            cause = exc

        if out and out.use_cache:
                with self._open_cached(out, remote, mode, encoding) as fd:
                    yield fd
            except FileNotFoundError as exc:
                raise FileMissingError(path) from exc

        abs_path = os.path.join(self.root_dir, path)
        if os.path.exists(abs_path):
            with open(abs_path, mode=mode, encoding=encoding) as fd:
                yield fd

        raise FileMissingError(path) from cause

    def _open_cached(self, out, remote=None, mode="r", encoding=None):
        if out.isdir():
            raise ValueError("Can't open a dir")

        cache_file = self.cache.local.checksum_to_path_info(out.checksum)
        cache_file = fspath_py35(cache_file)

        if os.path.exists(cache_file):
            return open(cache_file, mode=mode, encoding=encoding)

            remote_obj =
            remote_info = remote_obj.checksum_to_path_info(out.checksum)
            return, mode=mode, encoding=encoding)
        except RemoteActionNotImplemented:
            with self.state:
                cache_info = out.get_used_cache(remote=remote)
      , remote=remote)

            return open(cache_file, mode=mode, encoding=encoding)

    def close(self):

    def checkout(self, *args, **kwargs):
        return self._checkout(*args, **kwargs)

    def fetch(self, *args, **kwargs):
        return self._fetch(*args, **kwargs)

    def _reset(self):
        self.__dict__.pop("graph", None)
        self.__dict__.pop("stages", None)
        self.__dict__.pop("pipelines", None)
        self.__dict__.pop("dvcignore", None)