# Intermediate representation. The Translate module converts an Absyn tree
# into an IR tree.

from . import absyn, fracttypes


def d(depth, s=""):
    return " " * depth + s


class T:
    def __init__(self, node, datatype, children=None):
        self.datatype = datatype
        self.node = node  # the absyn node we were constructed from
        self.children = []

    def pretty_children(self, depth):
        r = []
        for child in self.children:
            if child is None:
                r.append(d(depth + 1, "<<None>>"))
            else:
                try:
                    r.append(child.pretty(depth + 1))
                except Exception as exn:
                    print("self", self)
                    print(len(child))
                    for c in child:
                        print(c)
                    print("<Error printing child '%s'>" % child)
                    raise

        return "".join(r)

    def __iter__(self):
        return absyn.NodeIter(self)

    def pretty(self, depth=0):
        child_str = self.pretty_children(depth)
        if child_str != "":
            end = d(depth, ")\n")
        else:
            end = ")\n"

        return d(depth, self.__str__()) + child_str + end

    def __str__(self):
        return self.__class__.__name__ + "(\n"

# exp and subtypes
# an exp computes a value


class Exp(T):
    def __init__(self, node, datatype):
        assert(datatype in fracttypes.typeList)
        T.__init__(self, node, datatype)


class Const(Exp):
    def __init__(self, value, node, datatype):
        Exp.__init__(self, node, datatype)
        if value is None:
            self.value = fracttypes.default_value(datatype)
        else:
            self.value = value

    def __str__(self):
        return "Const(%s" % self.value


class Enum(Exp):
    def __init__(self, value, node, datatype):
        Exp.__init__(self, node, datatype)
        self.value = value

    def __str__(self):
        return "Enum(%s" % self.value


class Temp(Exp):
    def __init__(self, temp, node, datatype):
        Exp.__init__(self, node, datatype)
        self.temp = temp

    def __str__(self):
        return "Temp(%s" % self.temp


class Binop(Exp):
    def __init__(self, op, children, node, datatype):
        Exp.__init__(self, node, datatype)
        (self.op, self.children) = (op, children)

    def __str__(self):
        return "Binop(" + self.op + "\n"


class Unop(Exp):
    def __init__(self, op, children, node, datatype):
        Exp.__init__(self, node, datatype)
        (self.op, self.children) = (op, children)

    def __str__(self):
        return "Unop(" + self.op + "\n"


class Var(Exp):
    def __init__(self, name, node, datatype):
        Exp.__init__(self, node, datatype)
        self.name = name

    def __str__(self):
        return "Var<%s>(%s" % (fracttypes.strOfType(self.datatype), self.name)


class Cast(Exp):
    def __init__(self, exp, node, datatype):
        Exp.__init__(self, node, datatype)
        self.children = [exp]

    def __str__(self):
        return "Cast<%s,%s>(\n" % \
            (fracttypes.strOfType(self.children[0].datatype),
             fracttypes.strOfType(self.datatype))


class Call(Exp):
    def __init__(self, func, args, node, datatype):
        Exp.__init__(self, node, datatype)
        self.op = func
        self.children = args

    def __str__(self):
        return "Call(" + self.op + "\n"


class ESeq(Exp):
    def __init__(self, stms, exp, node, datatype):
        Exp.__init__(self, node, datatype)
        self.children = stms + [exp]


class Move(Exp):
    def __init__(self, dest, exp, node, datatype):
        Exp.__init__(self, node, datatype)
        self.children = [dest, exp]

# stm and subtypes
# side effects + flow control


class Stm(T):
    def __init__(self, node, datatype):
        T.__init__(self, node, datatype)


class Jump(Stm):
    def __init__(self, dest, node):
        Stm.__init__(self, node, None)
        self.dest = dest

    def pretty(self, depth=0):
        return d(depth) + "Jump(" + self.dest + ")\n"


class CJump(Stm):
    def __init__(self, op, exp1, exp2, trueDest, falseDest, node):
        Stm.__init__(self, node, None)
        self.op = op
        self.children = [exp1, exp2]
        self.trueDest = trueDest
        self.falseDest = falseDest

    def pretty(self, depth=0):
        return d(depth) + "CJump(op='" + self.op + "'\n" + \
            self.pretty_children(depth) + \
            d(depth + 1, "true=" + self.trueDest) + "," + \
            "false=" + self.falseDest + ")\n"


class Seq(Stm):
    def __init__(self, stms, node):
        Stm.__init__(self, node, None)
        self.children = stms


class Label(Stm):
    def __init__(self, name, node):
        Stm.__init__(self, node, None)
        self.name = name

    def pretty(self, depth=0):
        return d(depth) + "Label(" + self.name + ")\n"
