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const builtin = 'firstTrailingBit';
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 {
  Type,
  kConcreteIntegerScalarsAndVectors,
  kFloatScalarsAndVectors,
} from '../../../../../util/conversion.js';
import { ShaderValidationTest } from '../../../shader_validation_test.js';

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

export const g = makeTestGroup(ShaderValidationTest);

const kValuesTypes = objectsToRecord(kConcreteIntegerScalarsAndVectors);

g.test('values')
  .desc(
    `
Validates that constant evaluation and override evaluation of ${builtin}() never errors
`
  )
  .params(u =>
    u
      .combine('stage', kConstantAndOverrideStages)
      .combine('type', keysOf(kValuesTypes))
      .filter(u => stageSupportsType(u.stage, kValuesTypes[u.type]))
      .beginSubcases()
      .expand('value', u => fullRangeForType(kValuesTypes[u.type]))
  )
  .fn(t => {
    const expectedResult = true; // firstTrailingBit() should never error
    validateConstOrOverrideBuiltinEval(
      t,
      builtin,
      expectedResult,
      [kValuesTypes[t.params.type].create(t.params.value)],
      t.params.stage
    );
  });

// u32 is included here to confirm that validation is failing due to a type issue and not something else.
const kFloatTypes = objectsToRecord([Type.u32, ...kFloatScalarsAndVectors]);

g.test('float_argument')
  .desc(
    `
Validates that float arguments are rejected by ${builtin}()
`
  )
  .params(u => u.combine('type', keysOf(kFloatTypes)))
  .fn(t => {
    const type = kFloatTypes[t.params.type];
    validateConstOrOverrideBuiltinEval(
      t,
      builtin,
      /* expectedResult */ type === Type.u32,
      [type.create(0)],
      'constant'
    );
  });

const kTests: {
  readonly [name: string]: {
    /** Arguments to pass to the builtin with parentheses. */
    readonly args: string;
    /** Should the test case pass. */
    readonly pass: boolean;
    /** Additional setup code in the function scope. */
    readonly preamble?: string;
  };
} = {
  valid: {
    args: '(1u)',
    pass: true,
  },
  // Number of arguments.
  no_parens: {
    args: '',
    pass: false,
  },
  too_few_args: {
    args: '()',
    pass: false,
  },
  too_many_args: {
    args: '(1u,2u)',
    pass: false,
  },
  // Arguments types (only 1 argument for this builtin).
  alias: {
    args: '(u32_alias(1))',
    pass: true,
  },
  bool: {
    args: '(false)',
    pass: false,
  },
  vec_bool: {
    args: '(vec2<bool>(false,true))',
    pass: false,
  },
  matrix: {
    args: '(mat2x2(1,1,1,1))',
    pass: false,
  },
  atomic: {
    args: '(a)',
    pass: false,
  },
  array: {
    preamble: 'var arry: array<u32, 5>;',
    args: '(arry)',
    pass: false,
  },
  array_runtime: {
    args: '(k.arry)',
    pass: false,
  },
  struct: {
    preamble: 'var x: A;',
    args: '(x)',
    pass: false,
  },
  enumerant: {
    args: '(read_write)',
    pass: false,
  },
  ptr: {
    preamble: `var<function> f = 1u;
               let p: ptr<function, u32> = &f;`,
    args: '(p)',
    pass: false,
  },
  ptr_deref: {
    preamble: `var<function> f = 1u;
               let p: ptr<function, u32> = &f;`,
    args: '(*p)',
    pass: true,
  },
  sampler: {
    args: '(s)',
    pass: false,
  },
  texture: {
    args: '(t)',
    pass: false,
  },
};

g.test('arguments')
  .desc(`Test compilation validation of ${builtin} with variously shaped and typed arguments`)
  .params(u => u.combine('test', keysOf(kTests)))
  .fn(t => {
    const test = kTests[t.params.test];
    t.expectCompileResult(
      test.pass,
      `alias u32_alias = u32;

      @group(0) @binding(0) var s: sampler;
      @group(0) @binding(1) var t: texture_2d<f32>;

      var<workgroup> a: atomic<u32>;

      struct A {
        i: u32,
      }
      struct B {
        arry: array<u32>,
      }
      @group(0) @binding(3) var<storage> k: B;


      @vertex
      fn main() -> @builtin(position) vec4<f32> {
        ${test.preamble ? test.preamble : ''}
        _ = ${builtin}${test.args};
        return vec4<f32>(.4, .2, .3, .1);
      }`
    );
  });

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}(1u); }`);
  });