const builtin = 'exp';
export const description = `
Validation tests for the ${builtin}() builtin.
`;

import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
import { keysOf, objectsToRecord } from '../../../../../../common/util/data_tables.js';
import { kValue } from '../../../../../util/constants.js';
import {
  Type,
  kConvertableToFloatScalarsAndVectors,
  scalarTypeOf,
} from '../../../../../util/conversion.js';
import { isRepresentable } from '../../../../../util/floating_point.js';
import { ShaderValidationTest } from '../../../shader_validation_test.js';

import {
  kConstantAndOverrideStages,
  rangeForType,
  stageSupportsType,
  validateConstOrOverrideBuiltinEval,
} from './const_override_validation.js';

export const g = makeTestGroup(ShaderValidationTest);

const kValuesTypes = objectsToRecord(kConvertableToFloatScalarsAndVectors);

const valueForType = rangeForType(
  [
    -1e2,
    -1e3,
    -4,
    -3,
    -2,
    -1,
    -1e-1,
    -1e-2,
    -1e-3,
    0,
    1e-3,
    1e-2,
    1e-1,
    1,
    2,
    3,
    4,
    1e2,
    1e3,
    Math.log2(kValue.f16.positive.max) - 0.1,
    Math.log2(kValue.f16.positive.max) + 0.1,
    Math.log2(kValue.f32.positive.max) - 0.1,
    Math.log2(kValue.f32.positive.max) + 0.1,
  ],
  [-100n, -1000n, -4n, -3n, -2n, -1n, 0n, 1n, 2n, 3n, 4n, 100n, 1000n]
);

g.test('values')
  .desc(
    `
Validates that constant evaluation and override evaluation of ${builtin}() rejects invalid values
`
  )
  .params(u =>
    u
      .combine('stage', kConstantAndOverrideStages)
      .combine('type', keysOf(kValuesTypes))
      .filter(u => stageSupportsType(u.stage, kValuesTypes[u.type]))
      .beginSubcases()
      .expand('value', u => valueForType(kValuesTypes[u.type]))
  )
  .fn(t => {
    const type = kValuesTypes[t.params.type];
    const expectedResult = isRepresentable(
      Math.exp(Number(t.params.value)),
      // AbstractInt is converted to AbstractFloat before calling into the builtin
      scalarTypeOf(type).kind === 'abstract-int' ? Type.abstractFloat : scalarTypeOf(type)
    );
    validateConstOrOverrideBuiltinEval(
      t,
      builtin,
      expectedResult,
      [type.create(t.params.value)],
      t.params.stage
    );
  });

const kArgCases = {
  good: '(1.2)',
  bad_no_parens: '',
  // Bad number of args
  bad_0args: '()',
  bad_2arg: '(1.2, 2.3)',
  // Bad value for arg 0
  bad_0bool: '(false)',
  bad_0array: '(array(1.1,2.2))',
  bad_0struct: '(modf(2.2))',
  bad_0uint: '(1u)',
  bad_0int: '(1i)',
  bad_0vec2i: '(vec2i())',
  bad_0vec2u: '(vec2u())',
  bad_0vec3i: '(vec3i())',
  bad_0vec3u: '(vec3u())',
  bad_0vec4i: '(vec4i())',
  bad_0vec4u: '(vec4u())',
};

g.test('args')
  .desc(`Test compilation failure of ${builtin} with variously shaped and typed arguments`)
  .params(u => u.combine('arg', keysOf(kArgCases)))
  .fn(t => {
    t.expectCompileResult(
      t.params.arg === 'good',
      `const c = ${builtin}${kArgCases[t.params.arg]};`
    );
  });

g.test('must_use')
  .desc(`Result of ${builtin} must be used`)
  .params(u => u.combine('use', [true, false]))
  .fn(t => {
    const use_it = t.params.use ? '_ = ' : '';
    t.expectCompileResult(t.params.use, `fn f() { ${use_it}${builtin}${kArgCases['good']}; }`);
  });
