# -*- coding: utf-8 -*-
from __future__ import unicode_literals, absolute_import

import os
from collections import OrderedDict
import re
import sys

from io import StringIO

from configparser import ConfigParser, NoOptionError
from pathlib import PurePath

from .errors import MalformedDependencyFileError
from .regex import HASH_REGEX

from .dependencies import DependencyFile, Dependency
from pipenv.vendor.packaging.requirements import Requirement as PackagingRequirement,\
    InvalidRequirement
from . import filetypes
from pipenv.vendor.packaging.specifiers import SpecifierSet
from pipenv.vendor.packaging.version import Version, InvalidVersion
import json

if sys.version_info >= (3, 11):
    import tomllib
else:
    import pipenv.vendor.tomli as tomllib


# this is a backport from setuptools 26.1
def setuptools_parse_requirements_backport(strs):  # pragma: no cover
    # Copyright (C) 2016 Jason R Coombs <jaraco@jaraco.com>
    #
    # Permission is hereby granted, free of charge, to any person obtaining a
    # copy of this software and associated documentation files
    # (the "Software"), to deal in the Software without restriction, including
    # without limitation the rights to use, copy, modify, merge, publish,
    # distribute, sublicense, and/or sell copies of the Software, and to permit
    # persons to whom the Software is furnished to do so, subject to the
    # following conditions:
    #
    # The above copyright notice and this permission notice shall be included
    # in all copies or substantial portions of the Software.
    #
    # THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
    # OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    # MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
    # IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
    # CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
    # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
    # SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
    """Yield ``Requirement`` objects for each specification in `strs`

    `strs` must be a string, or a (possibly-nested) iterable thereof.
    """
    # create a steppable iterator, so we can handle \-continuations
    def yield_lines(strs):
        """Yield non-empty/non-comment lines of a string or sequence"""
        if isinstance(strs, str):
            for s in strs.splitlines():
                s = s.strip()
                # skip blank lines/comments
                if s and not s.startswith('#'):
                    yield s
        else:
            for ss in strs:
                for s in yield_lines(ss):
                    yield s
    lines = iter(yield_lines(strs))

    for line in lines:
        # Drop comments -- a hash without a space may be in a URL.
        if ' #' in line:
            line = line[:line.find(' #')]
        # If there is a line continuation, drop it, and append the next line.
        if line.endswith('\\'):
            line = line[:-2].strip()
            line += next(lines)
        yield PackagingRequirement(line)


class RequirementsTXTLineParser(object):
    """

    """

    @classmethod
    def parse(cls, line):
        """

        :param line:
        :return:
        """
        try:
            # setuptools requires a space before the comment.
            # If this isn't the case, add it.
            if "\t#" in line:
                parsed, = setuptools_parse_requirements_backport(
                    line.replace("\t#", "\t #"))
            else:
                parsed, = setuptools_parse_requirements_backport(line)
        except InvalidRequirement:
            return None
        dep = Dependency(
            name=parsed.name,
            specs=parsed.specifier,
            line=line,
            extras=parsed.extras,
            dependency_type=filetypes.requirements_txt
        )
        return dep


class Parser(object):
    """

    """

    def __init__(self, obj, resolve=False):
        """

        :param obj:
        """
        self.obj = obj
        self._lines = None
        self.resolve = resolve

    def iter_lines(self, lineno=0):
        """

        :param lineno:
        :return:
        """
        for line in self.lines[lineno:]:
            yield line

    @property
    def lines(self):
        """

        :return:
        """
        if self._lines is None:
            self._lines = self.obj.content.splitlines()
        return self._lines

    @property
    def is_marked_file(self):
        """

        :return:
        """
        for n, line in enumerate(self.iter_lines()):
            for marker in self.obj.file_marker:
                if marker in line:
                    return True
            if n >= 2:
                break
        return False

    def is_marked_line(self, line):
        """

        :param line:
        :return:
        """
        for marker in self.obj.line_marker:
            if marker in line:
                return True
        return False

    @classmethod
    def parse_hashes(cls, line):
        """

        :param line:
        :return:
        """
        hashes = []
        for match in re.finditer(HASH_REGEX, line):
            hashes.append(line[match.start():match.end()])
        return re.sub(HASH_REGEX, "", line).strip(), hashes

    @classmethod
    def parse_index_server(cls, line):
        """

        :param line:
        :return:
        """
        groups = re.split(pattern=r"[=\s]+", string=line.strip(), maxsplit=100)

        if len(groups) >= 2:
            return groups[1] if groups[1].endswith("/") else groups[1] + "/"

        return None

    @classmethod
    def resolve_file(cls, file_path, line):
        """

        :param file_path:
        :param line:
        :return:
        """
        line = line.replace("-r ", "").replace("--requirement ", "")
        normalized_path = PurePath(file_path)
        if " #" in line:
            line = line.split("#")[0].strip()
        return str(normalized_path.parent.joinpath(line))


class RequirementsTXTParser(Parser):
    """

    """

    def parse(self):
        """
        Parses a requirements.txt-like file
        """
        index_server = None
        for num, line in enumerate(self.iter_lines()):
            line = line.rstrip()
            if not line:
                continue
            if line.startswith('#'):
                # comments are lines that start with # only
                continue
            if line.startswith('-i') or \
               line.startswith('--index-url') or \
               line.startswith('--extra-index-url'):
                # this file is using a private index server, try to parse it
                index_server = self.parse_index_server(line)
                continue
            elif self.obj.path and \
                    (line.startswith('-r') or
                     line.startswith('--requirement')):

                req_file_path = self.resolve_file(self.obj.path, line)

                if self.resolve and os.path.exists(req_file_path):
                    with open(req_file_path, 'r') as f:
                        content = f.read()

                        dep_file = DependencyFile(
                            content=content,
                            path=req_file_path,
                            resolve=True
                        )
                        dep_file.parse()
                        self.obj.resolved_files.append(dep_file)
                else:
                    self.obj.resolved_files.append(req_file_path)

            elif line.startswith('-f') or line.startswith('--find-links') or \
                line.startswith('--no-index') or \
                line.startswith('--allow-external') or \
                line.startswith('--allow-unverified') or \
                line.startswith('-Z') or \
                    line.startswith('--always-unzip'):
                continue
            elif self.is_marked_line(line):
                continue
            else:
                try:

                    parseable_line = line

                    # multiline requirements are not parseable
                    if "\\" in line:
                        parseable_line = line.replace("\\", "")
                        for next_line in self.iter_lines(num + 1):
                            parseable_line += next_line.strip().replace("\\",
                                                                        "")
                            line += "\n" + next_line
                            if "\\" in next_line:
                                continue
                            break
                        # ignore multiline requirements if they are marked
                        if self.is_marked_line(parseable_line):
                            continue

                    hashes = []
                    if "--hash" in parseable_line:
                        parseable_line, hashes = Parser.parse_hashes(
                            parseable_line)

                    req = RequirementsTXTLineParser.parse(parseable_line)
                    if req:
                        req.hashes = hashes
                        req.index_server = index_server
                        # replace the requirements line with the 'real' line
                        req.line = line
                        self.obj.dependencies.append(req)
                except ValueError:
                    continue


class ToxINIParser(Parser):
    """

    """

    def parse(self):
        """

        :return:
        """
        parser = ConfigParser()
        parser.readfp(StringIO(self.obj.content))
        for section in parser.sections():
            try:
                content = parser.get(section=section, option="deps")
                for n, line in enumerate(content.splitlines()):
                    if self.is_marked_line(line):
                        continue
                    if line:
                        req = RequirementsTXTLineParser.parse(line)
                        if req:
                            req.dependency_type = self.obj.file_type
                            self.obj.dependencies.append(req)
            except NoOptionError:
                pass


class CondaYMLParser(Parser):
    """

    """

    def parse(self):
        """

        :return:
        """
        import yaml
        try:
            data = yaml.safe_load(self.obj.content)
            if data and 'dependencies' in data and \
                    isinstance(data['dependencies'], list):
                for dep in data['dependencies']:
                    if isinstance(dep, dict) and 'pip' in dep:
                        for n, line in enumerate(dep['pip']):
                            if self.is_marked_line(line):
                                continue
                            req = RequirementsTXTLineParser.parse(line)
                            if req:
                                req.dependency_type = self.obj.file_type
                                self.obj.dependencies.append(req)
        except yaml.YAMLError:
            pass


class PipfileParser(Parser):

    def parse(self):
        """
        Parse a Pipfile (as seen in pipenv)
        :return:
        """
        try:
            data = tomllib.loads(self.obj.content)
            if data:
                for package_type in ['packages', 'dev-packages']:
                    if package_type in data:
                        for name, specs in data[package_type].items():
                            # skip on VCS dependencies
                            if not isinstance(specs, str):
                                continue
                            if specs == '*':
                                specs = ''
                            self.obj.dependencies.append(
                                Dependency(
                                    name=name, specs=SpecifierSet(specs),
                                    dependency_type=filetypes.pipfile,
                                    line=''.join([name, specs]),
                                    section=package_type
                                )
                            )
        except (tomllib.TOMLDecodeError, IndexError):
            pass


class PipfileLockParser(Parser):

    def parse(self):
        """
        Parse a Pipfile.lock (as seen in pipenv)
        :return:
        """
        try:
            data = json.loads(self.obj.content, object_pairs_hook=OrderedDict)
            if data:
                for package_type in ['default', 'develop']:
                    if package_type in data:
                        for name, meta in data[package_type].items():
                            # skip VCS dependencies
                            if 'version' not in meta:
                                continue
                            specs = meta['version']
                            hashes = meta['hashes']
                            self.obj.dependencies.append(
                                Dependency(
                                    name=name, specs=SpecifierSet(specs),
                                    dependency_type=filetypes.pipfile_lock,
                                    hashes=hashes,
                                    line=''.join([name, specs]),
                                    section=package_type
                                )
                            )
        except ValueError as e:
            raise MalformedDependencyFileError(info=str(e))


class SetupCfgParser(Parser):
    def parse(self):
        parser = ConfigParser()
        parser.readfp(StringIO(self.obj.content))
        for section in parser.values():
            if section.name == 'options':
                options = 'install_requires', 'setup_requires', 'test_require'
                for name in options:
                    content = section.get(name)
                    if not content:
                        continue
                    self._parse_content(content)
            elif section.name == 'options.extras_require':
                for content in section.values():
                    self._parse_content(content)

    def _parse_content(self, content):
        for n, line in enumerate(content.splitlines()):
            if self.is_marked_line(line):
                continue
            if line:
                req = RequirementsTXTLineParser.parse(line)
                if req:
                    req.dependency_type = self.obj.file_type
                    self.obj.dependencies.append(req)


class PoetryLockParser(Parser):

    def parse(self):
        """
        Parse a poetry.lock
        """
        try:
            data = tomllib.loads(self.obj.content)
            pkg_key = 'package'
            if data:
                try:
                    dependencies = data[pkg_key]
                except KeyError:
                    raise KeyError(
                        "Poetry lock file is missing the package section")

                for dep in dependencies:
                    try:
                        name = dep['name']
                        spec = "=={version}".format(
                            version=Version(dep['version']))
                        section = dep['category']
                    except KeyError:
                        raise KeyError("Malformed poetry lock file")
                    except InvalidVersion:
                        continue

                    self.obj.dependencies.append(
                        Dependency(
                            name=name, specs=SpecifierSet(spec),
                            dependency_type=filetypes.poetry_lock,
                            line=''.join([name, spec]),
                            section=section
                        )
                    )
        except (tomllib.TOMLDecodeError, IndexError) as e:
            raise MalformedDependencyFileError(info=str(e))


def parse(content, file_type=None, path=None, sha=None, marker=((), ()),
          parser=None, resolve=False):
    """

    :param content:
    :param file_type:
    :param path:
    :param sha:
    :param marker:
    :param parser:
    :return:
    """

    dep_file = DependencyFile(
        content=content,
        path=path,
        sha=sha,
        marker=marker,
        file_type=file_type,
        parser=parser,
        resolve=resolve
    )

    return dep_file.parse()
