"""Intermediate representation of modules."""

from typing import List, Tuple, Dict

from mypyc.common import JsonDict
from mypyc.ir.ops import DeserMaps
from mypyc.ir.rtypes import RType, deserialize_type
from mypyc.ir.func_ir import FuncIR, FuncDecl
from mypyc.ir.class_ir import ClassIR


class ModuleIR:
    """Intermediate representation of a module."""

    def __init__(
            self,
            fullname: str,
            imports: List[str],
            functions: List[FuncIR],
            classes: List[ClassIR],
            final_names: List[Tuple[str, RType]]) -> None:
        self.fullname = fullname
        self.imports = imports[:]
        self.functions = functions
        self.classes = classes
        self.final_names = final_names

    def serialize(self) -> JsonDict:
        return {
            'fullname': self.fullname,
            'imports': self.imports,
            'functions': [f.serialize() for f in self.functions],
            'classes': [c.serialize() for c in self.classes],
            'final_names': [(k, t.serialize()) for k, t in self.final_names],
        }

    @classmethod
    def deserialize(cls, data: JsonDict, ctx: DeserMaps) -> 'ModuleIR':
        return ModuleIR(
            data['fullname'],
            data['imports'],
            [ctx.functions[FuncDecl.get_id_from_json(f)] for f in data['functions']],
            [ClassIR.deserialize(c, ctx) for c in data['classes']],
            [(k, deserialize_type(t, ctx)) for k, t in data['final_names']],
        )


def deserialize_modules(data: Dict[str, JsonDict], ctx: DeserMaps) -> Dict[str, ModuleIR]:
    """Deserialize a collection of modules.

    The modules can contain dependencies on each other.

    Arguments:
        data: A dict containing the modules to deserialize.
        ctx: The deserialization maps to use and to populate.
             They are populated with information from the deserialized
             modules and as a precondition must have been populated by
             deserializing any dependencies of the modules being deserialized
             (outside of dependencies between the modules themselves).

    Returns a map containing the deserialized modules.
    """
    for mod in data.values():
        # First create ClassIRs for every class so that we can construct types and whatnot
        for cls in mod['classes']:
            ir = ClassIR(cls['name'], cls['module_name'])
            assert ir.fullname not in ctx.classes, "Class %s already in map" % ir.fullname
            ctx.classes[ir.fullname] = ir

    for mod in data.values():
        # Then deserialize all of the functions so that methods are available
        # to the class deserialization.
        for method in mod['functions']:
            func = FuncIR.deserialize(method, ctx)
            assert func.decl.id not in ctx.functions, (
                "Method %s already in map" % func.decl.fullname)
            ctx.functions[func.decl.id] = func

    return {k: ModuleIR.deserialize(v, ctx) for k, v in data.items()}


# ModulesIRs should also always be an *OrderedDict*, but if we
# declared it that way we would need to put it in quotes everywhere...
ModuleIRs = Dict[str, ModuleIR]