import idaapi
from idc import *

from miasm2.analysis.machine import Machine
import miasm2.expression.expression as m2_expr


def guess_machine():
    "Return an instance of Machine corresponding to the IDA guessed processor"

    processor_name = GetLongPrm(INF_PROCNAME)

    if processor_name == "metapc":

        # HACK: check 32/64 using INF_START_SP
        max_size = GetLongPrm(INF_START_SP)
        if max_size == 0x80:  # TODO XXX check
            machine = Machine("x86_16")
        elif max_size == 0xFFFFFFFF:
            machine = Machine("x86_32")
        elif max_size == 0xFFFFFFFFFFFFFFFF:
            machine = Machine("x86_64")
        else:
            raise ValueError('cannot guess 32/64 bit! (%x)' % max_size)
    elif processor_name == "ARM":
        # TODO ARM/thumb
        # hack for thumb: set armt = True in globals :/
        # set bigendiant = True is bigendian
        is_armt = globals().get('armt', False)
        is_bigendian = globals().get('bigendian', False)
        if is_armt:
            if is_bigendian:
                machine = Machine("armtb")
            else:
                machine = Machine("armtl")
        else:
            if is_bigendian:
                machine = Machine("armb")
            else:
                machine = Machine("arml")

        from miasm2.analysis.disasm_cb import arm_guess_subcall, arm_guess_jump_table
        guess_funcs.append(arm_guess_subcall)
        guess_funcs.append(arm_guess_jump_table)

    elif processor_name == "msp430":
        machine = Machine("msp430")
    elif processor_name == "mipsl":
        machine = Machine("mipsl")
    elif processor_name == "mipsb":
        machine = Machine("mipsb")
    else:
        print repr(processor_name)
        raise NotImplementedError('not fully functional')

    return machine


def expr2colorstr(regs_ids, expr):
    """Colorize an Expr instance for IDA
    @regs_ids: list of ExprId corresponding to available registers
    @expr: Expr instance to colorize
    """

    if isinstance(expr, m2_expr.ExprId):
        s = str(expr)
        if expr in regs_ids:
            s = idaapi.COLSTR(s, idaapi.SCOLOR_REG)
    elif isinstance(expr, m2_expr.ExprInt):
        s = str(expr)
        s = idaapi.COLSTR(s, idaapi.SCOLOR_NUMBER)
    elif isinstance(expr, m2_expr.ExprMem):
        s = '%s[%s]' % (idaapi.COLSTR('@' + str(expr.size),
                                      idaapi.SCOLOR_RPTCMT),
                         expr2colorstr(regs_ids, expr.arg))
    elif isinstance(expr, m2_expr.ExprOp):
        out = []
        for a in expr.args:
            s = expr2colorstr(regs_ids, a)
            if isinstance(a, m2_expr.ExprOp):
                s = "(%s)" % s
            out.append(s)
        if len(out) == 1:
            s = "%s %s" % (expr.op, str(out[0]))
        else:
            s = (" " + expr.op + " ").join(out)
    elif isinstance(expr, m2_expr.ExprAff):
        s = "%s = %s" % (
            expr2colorstr(regs_ids, expr.dst), expr2colorstr(regs_ids, expr.src))
    elif isinstance(expr, m2_expr.ExprCond):
        cond = expr2colorstr(regs_ids, expr.cond)
        src1 = expr2colorstr(regs_ids, expr.src1)
        src2 = expr2colorstr(regs_ids, expr.src2)
        s = "(%s?%s:%s)" % (cond, src1, src2)
    elif isinstance(expr, m2_expr.ExprSlice):
        s = "(%s)[%s:%s]" % (expr2colorstr(regs_ids, expr.arg),
                             idaapi.COLSTR(str(expr.start),
                                           idaapi.SCOLOR_RPTCMT),
                             idaapi.COLSTR(str(expr.stop),
                                           idaapi.SCOLOR_RPTCMT))
    elif isinstance(expr, m2_expr.ExprCompose):
        s = "{"
        s += ", ".join(["%s, %s, %s" % (expr2colorstr(regs_ids, subexpr),
                                        idaapi.COLSTR(str(start),
                                                      idaapi.SCOLOR_RPTCMT),
                                        idaapi.COLSTR(str(stop),
                                                      idaapi.SCOLOR_RPTCMT))
                        for subexpr, start, stop in expr.args])
        s += "}"
    else:
        s = str(expr)

    return s