""" Description of avr registers """

from ..registers import Register, RegisterClass
from ... import ir


class AvrRegister(Register):
    """ An 8-bit avr register """

    bitsize = 8

    @classmethod
    def from_num(cls, num):
        return num_reg_map[num]


class HighAvrRegister(AvrRegister):
    pass


class AvrWordRegister(Register):
    """ Register covering two 8 bit registers """

    bitsize = 16

    @classmethod
    def from_num(cls, num):
        return num_w_reg_map[num]

    @property
    def lo(self):
        return AvrRegister.from_num(self.num)

    @property
    def hi(self):
        return AvrRegister.from_num(self.num + 1)


class SuperLowAvrWordRegister(AvrWordRegister):
    # The lowest word registers
    pass


class HighAvrWordRegister(AvrWordRegister):
    # The higher half of word registers
    pass


class SuperHighAvrWordRegister(AvrWordRegister):
    # The higher quarter of the word registers
    pass


class AvrPointerRegister(SuperHighAvrWordRegister):
    pass


class AvrXRegister(AvrPointerRegister):
    pass


class AvrYRegister(AvrPointerRegister):
    pass


class AvrZRegister(AvrPointerRegister):
    pass


# Special registers:
class AvrSpecialRegister(Register):
    pass


class AvrStatusRegister(AvrSpecialRegister):
    bitsize = 8


class AvrStackPointerRegister(AvrSpecialRegister):
    bitsize = 16


class AvrProgramCounterRegister(AvrSpecialRegister):
    bitsize = 32


SREG = AvrStatusRegister("SREG")
SP = AvrStackPointerRegister("SP")
PC = AvrProgramCounterRegister("PC")


r0 = AvrRegister("r0", num=0)
r1 = AvrRegister("r1", num=1)
r2 = AvrRegister("r2", num=2)
r3 = AvrRegister("r3", num=3)
r4 = AvrRegister("r4", num=4)
r5 = AvrRegister("r5", num=5)
r6 = AvrRegister("r6", num=6)
r7 = AvrRegister("r7", num=7)

r8 = AvrRegister("r8", num=8)
r9 = AvrRegister("r9", num=9)
r10 = AvrRegister("r10", num=10)
r11 = AvrRegister("r11", num=11)
r12 = AvrRegister("r12", num=12)
r13 = AvrRegister("r13", num=13)
r14 = AvrRegister("r14", num=14)
r15 = AvrRegister("r15", num=15)

r16 = HighAvrRegister("r16", num=16)
r17 = HighAvrRegister("r17", num=17)
r18 = HighAvrRegister("r18", num=18)
r19 = HighAvrRegister("r19", num=19)
r20 = HighAvrRegister("r20", num=20)
r21 = HighAvrRegister("r21", num=21)
r22 = HighAvrRegister("r22", num=22)
r23 = HighAvrRegister("r23", num=23)

r24 = HighAvrRegister("r24", num=24)
r25 = HighAvrRegister("r25", num=25)
r26 = HighAvrRegister("r26", num=26)
r27 = HighAvrRegister("r27", num=27)
r28 = HighAvrRegister("r28", num=28)
r29 = HighAvrRegister("r29", num=29)
r30 = HighAvrRegister("r30", num=30)
r31 = HighAvrRegister("r31", num=31)

r1r0 = SuperLowAvrWordRegister("r1:r0", num=0, aliases=(r1, r0))
r3r2 = AvrWordRegister("r3:r2", num=2, aliases=(r3, r2))
r5r4 = AvrWordRegister("r5:r4", num=4, aliases=(r5, r4))
r7r6 = AvrWordRegister("r7:r6", num=6, aliases=(r7, r6))
r9r8 = AvrWordRegister("r9:r8", num=8, aliases=(r9, r8))
r11r10 = AvrWordRegister("r11:r10", num=10, aliases=(r11, r10))
r13r12 = AvrWordRegister("r13:r12", num=12, aliases=(r13, r12))
r15r14 = AvrWordRegister("r15:r14", num=14, aliases=(r15, r14))
r17r16 = HighAvrWordRegister("r17:r16", num=16, aliases=(r17, r16))
r19r18 = HighAvrWordRegister("r19:r18", num=18, aliases=(r19, r18))
r21r20 = HighAvrWordRegister("r21:r20", num=20, aliases=(r21, r20))
r23r22 = HighAvrWordRegister("r23:r22", num=22, aliases=(r23, r22))
W = SuperHighAvrWordRegister("W", num=24, aliases=(r25, r24), aka=("r25:r24",))
X = AvrXRegister("X", num=26, aliases=(r27, r26), aka=("r27:r26",))
AvrXRegister.registers = [X]
Y = AvrYRegister("Y", num=28, aliases=(r29, r28), aka=("r29:r28",))
AvrYRegister.registers = [Y]
Z = AvrZRegister("Z", num=30, aliases=(r31, r30), aka=("r31:r30",))
AvrZRegister.registers = [Z]
AvrPointerRegister.registers = (X, Y, Z)
SuperHighAvrWordRegister.registers = (W, X, Y, Z)


lo_regs = (
    r0,
    r1,
    r2,
    r3,
    r4,
    r5,
    r6,
    r7,
    r8,
    r9,
    r10,
    r11,
    r12,
    r13,
    r14,
    r15,
)
hi_regs = (
    r16,
    r17,
    r18,
    r19,
    r20,
    r21,
    r22,
    r23,
    r24,
    r25,
    r26,
    r27,
    r28,
    r29,
    r30,
    r31,
)
all_regs = lo_regs + hi_regs
alloc_lo_regs = (r2, r3, r4, r5, r6, r7, r8, r9, r10, r11, r12, r13, r14, r15)
alloc_regs = alloc_lo_regs + hi_regs

callee_save = (
    r2,
    r3,
    r4,
    r5,
    r6,
    r7,
    r8,
    r9,
    r10,
    r11,
    r12,
    r13,
    r14,
    r15,
    r16,
    r17,
)

caller_save = (r18, r19, r20, r21, r22, r23, r24, r25, r26, r27, r30, r31)

gdb_registers = all_regs + (SREG, SP, PC)

lo_w_regs = (r1r0, r3r2, r5r4, r7r6, r9r8, r11r10, r13r12, r15r14)
hi_w_regs = (r17r16, r19r18, r21r20, r23r22, W, X, Y, Z)
all_w_regs = lo_w_regs + hi_w_regs
alloc_lo_w_regs = (r3r2, r5r4, r7r6, r9r8, r11r10, r13r12, r15r14)
alloc_w_regs = alloc_lo_w_regs + hi_w_regs

num_reg_map = {r.num: r for r in all_regs}
num_w_reg_map = {r.num: r for r in all_w_regs}

AvrRegister.registers = all_regs
HighAvrRegister.registers = hi_regs
AvrWordRegister.registers = all_w_regs
HighAvrWordRegister.registers = hi_w_regs


register_classes = [
    RegisterClass("reg", [ir.i8, ir.u8], AvrRegister, alloc_regs),
    RegisterClass("hireg", [], HighAvrRegister, hi_regs),
    RegisterClass("suhireg", [], SuperHighAvrWordRegister, (W, X, Y, Z)),
    RegisterClass("ptrreg", [], AvrPointerRegister, (X, Y, Z)),
    RegisterClass("xreg", [], AvrXRegister, (X,)),
    RegisterClass("yreg", [], AvrYRegister, (Y,)),
    RegisterClass("zreg", [], AvrZRegister, (Z,)),
    RegisterClass(
        "reg16", [ir.i16, ir.u16, ir.ptr], AvrWordRegister, alloc_w_regs
    ),
    RegisterClass("hireg16", [], HighAvrWordRegister, hi_w_regs),
    RegisterClass("firstreg16", [], SuperLowAvrWordRegister, [r1r0]),
]
