import unittest
from tinygrad import Tensor, Variable, Context
from tinygrad.helpers import cpu_events
from tinygrad.schedule import schedule_cache

def schedule_one():
  Tensor([1]).schedule()

class TestScheduleCache(unittest.TestCase):
  def test_bound_variable_var_vals(self):
    v = Variable('pos', 1, 100)
    x = Tensor.ones(10).contiguous().realize()

    t = x + Tensor(v.bind(42))
    _, var_vals = t.schedule_with_vars()
    self.assertEqual(var_vals, {'pos': 42})

  def test_disable_schedule_cache(self):
    schedule_cache.clear()

    # test write
    with Context(SCACHE=0): schedule_one()
    self.assertEqual(len(schedule_cache), 0)
    with Context(SCACHE=1):
      schedule_one()
      schedule_one()
    self.assertEqual(len(schedule_cache), 1)

    # test read
    with Context(PROFILE=1):
      cpu_events.clear()
      with Context(SCACHE=0): schedule_one()
      num_events_no_cache = len(cpu_events)

      cpu_events.clear()
      with Context(SCACHE=1): schedule_one()
      num_events_cache = len(cpu_events)
    self.assertLess(num_events_cache, num_events_no_cache)

if __name__ == "__main__":
  unittest.main()