# IfcOpenShell - IFC toolkit and geometry engine
# Copyright (C) 2021 Thomas Krijnen <thomas@aecgeeks.com>
#
# This file is part of IfcOpenShell.
#
# IfcOpenShell is free software: you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# IfcOpenShell is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public License
# along with IfcOpenShell.  If not, see <http://www.gnu.org/licenses/>.


import nodes
import platform
import collections

if tuple(map(int, platform.python_version_tuple())) < (2, 7):
    import ordereddict

    collections.OrderedDict = ordereddict.OrderedDict

# According to ISO 10303-11 7.1.2: Letters: "... The case of
# letters is significant only within explicit string literals."
class OrderedCaseInsensitiveDict_KeyObject(str):
    def __eq__(self, other):
        return self.lower() == other.lower()

    def __hash__(self):
        return hash(self.lower())


class OrderedCaseInsensitiveDict(collections.OrderedDict):
    def __init__(self, *args, **kwargs):
        collections.OrderedDict.__init__(self)
        for key, value in collections.OrderedDict(*args, **kwargs).items():
            self[OrderedCaseInsensitiveDict_KeyObject(key)] = value

    def __setitem__(self, key, value):
        return collections.OrderedDict.__setitem__(self, OrderedCaseInsensitiveDict_KeyObject(key), value)

    def __getitem__(self, key):
        return collections.OrderedDict.__getitem__(self, OrderedCaseInsensitiveDict_KeyObject(key))

    def get(self, key, *args, **kwargs):
        return collections.OrderedDict.get(self, OrderedCaseInsensitiveDict_KeyObject(key), *args, **kwargs)

    def __contains__(self, key):
        return collections.OrderedDict.__contains__(self, OrderedCaseInsensitiveDict_KeyObject(key))

    def __delitem__(self, key):
        return collections.OrderedDict.__delitem__(self, OrderedCaseInsensitiveDict_KeyObject(key))


class Schema:
    def is_enumeration(self, v):
        return str(v) in self.enumerations

    def is_select(self, v):
        return str(v) in self.selects

    def is_simpletype(self, v):
        return str(v) in self.simpletypes

    def is_type(self, v):
        return str(v) in self.types

    def is_entity(self, v):
        return str(v) in self.entities

    def __len__(self):
        return len(self.types) + len(self.entities)

    def __iter__(self):
        return iter(self.keys)

    def __getitem__(self, key):
        return self.all_declarations[OrderedCaseInsensitiveDict_KeyObject(key)]

    def __init__(self, parsetree):
        self.tree = parsetree
        schema = next(iter(parsetree.syntax[0]))
        self.name = schema.simple_id
        schema_declarations = list(schema.schema_body[0])

        sort = lambda d: OrderedCaseInsensitiveDict(sorted(d))

        declarations = [
            d.any()[0]
            for d in schema_declarations
            if d.rule == "declaration"
        ] + [
            d
            for d in schema_declarations
            if d.rule == "RuleDeclaration"
        ]
        
        self.types = sort([(t.name, t) for t in declarations if isinstance(t, nodes.TypeDeclaration)])
        self.entities = sort([(t.name, t) for t in declarations if isinstance(t, nodes.EntityDeclaration)])
        self.rules = sort([(t.name, t) for t in declarations if isinstance(t, nodes.RuleDeclaration)])
        self.functions = sort([(t.name, t) for t in declarations if isinstance(t, nodes.FunctionDeclaration)])

        self.keys = list(self.types.keys()) + list(self.entities.keys()) + list(self.rules.keys()) + list(self.functions.keys())
        self.all_declarations = {k: v for d in (self.types, self.entities, self.rules, self.functions) for k, v in d.items()}

        of_type = lambda *types: sort(
            [(a, b.type) for a, b in self.types.items() if any(isinstance(b.type, ty) for ty in types)]
        )

        self.enumerations = of_type(nodes.EnumerationType)
        self.selects = of_type(nodes.SelectType)
        self.simpletypes = of_type(
            str, nodes.AggregationType, nodes.BinaryType, nodes.StringType, nodes.SimpleType, nodes.NamedType
        )

        assert len(self.enumerations) + len(self.selects) + len(self.simpletypes) == len(self.types)
