# this is a temporary intermediate step while we remove this index style
from tinygrad.uop.ops import PatternMatcher, UPat, Ops
from tinygrad.dtype import Invalid, dtypes

pm_move_gates_from_index = PatternMatcher([
  # here we create the alt value for load to be 0s and remove the where Invalid
  (UPat.var("buf").index(UPat.var("gate").where(UPat.var("idx"), UPat(arg=Invalid))).or_casted(name="cast").load(name="l"),
   lambda buf,gate,idx,cast,l: buf.index(idx, ptr=True).cast(cast.dtype).load(l.const_like(0), gate, dtype=l.dtype)),
  (UPat.var("buf").index(UPat.var("gate").where(UPat.var("idx"), UPat(arg=Invalid))).or_casted(name="cast").store(UPat.var("data")),
   lambda buf,gate,idx,cast,data: buf.index(idx, ptr=True).cast(cast.dtype).store(data, gate)),

  # for image idx
  (UPat.var("buf").index(UPat.var("gate").where(UPat.var("idx_y"), UPat(arg=Invalid)),
                         UPat.var("gate").where(UPat.var("idx_x"), UPat(arg=Invalid))).or_casted(name="cast").load(name="l"),
   lambda buf,gate,idx_y,idx_x,cast,l: buf.index(idx_y, idx_x, ptr=True).cast(cast.dtype).load(l.const_like(0), gate, dtype=l.dtype)),
  (UPat.var("buf").index(UPat.var("gate").where(UPat.var("idx_y"), UPat(arg=Invalid)),
                         UPat.var("gate").where(UPat.var("idx_x"), UPat(arg=Invalid))).or_casted(name="cast").store(UPat.var("data")),
   lambda buf,gate,idx_y,idx_x,cast,data: buf.index(idx_y, idx_x, ptr=True).cast(cast.dtype).store(data, gate)),

  # Where after gated load becomes alt value
  (UPat.var("gate").where(UPat().load(UPat(), UPat.var("gate", dtype=dtypes.bool), name="l").or_casted(), UPat.var("a")), lambda gate,l,a:
   l.replace(src=(l.src[0], a.src[0] if a.op is Ops.CAST and a.src[0].dtype == l.dtype else a.cast(l.dtype), l.src[2])).cast(a.dtype)),
  (UPat.var("gate").where(UPat.var("a"), UPat().load(UPat(), ~UPat.var("gate", dtype=dtypes.bool), name="l").or_casted()), lambda gate,l,a:
   l.replace(src=(l.src[0], a.src[0] if a.op is Ops.CAST and a.src[0].dtype == l.dtype else a.cast(l.dtype), l.src[2])).cast(a.dtype)),
])