package linthost

import (
  "strings"
  "testing"
)

// TestRuleCorpusPreferRegexpExec verifies a reduced trigger from the lint rule corpus
// typescript-prefer-regexp-exec.ts under a real Program.
//
// `typescript/prefer-regexp-exec` is type-aware: a parser-only engine run skips it
// because Context.Checker is nil. This Go scenario therefore reuses the
// `seedLintProject` shape established by `prefer-includes` and `no-for-in-array`:
// materialize a tsconfig project, run `ttsc lint check`, and assert on the rendered
// diagnostics.
//
// The corpus fixture packages/lint/test/testdata/corpus/typescript-prefer-regexp-exec.ts is run by TestLintFixtureCorpus; this Go scenario locks the minimum-viable trigger
// (`text.match(/foo/)`) so a future shim regression surfaces here without depending
// on the full fixture.
//
// 1. Seed a project that calls `text.match(/foo/)` on a `string`.
// 2. Run `check` with typescript/prefer-regexp-exec enabled as error.
// 3. Assert the command exits non-zero and stderr mentions the rule.
//
// @evidence contracts/testing.md#behavioral-verification String match with a nonglobal regex must report.
// @evidence contracts/testing.md#independent-expectations The original authored input fixes exactly one typescript/prefer-regexp-exec rendered error at line 2, code 2 and empty stdout; its independently authored typed counterpart requires code 0 and no rule errors.
// @evidence contracts/testing.md#distinguishing-cases Direct exec keeps the same search boundary.
// @evidence contracts/testing.md#execution-ownership TestRuleCorpusPreferRegexpExec invokes the in-process check command and shared typed semantic oracles over real Program/Checker instances; fixture configuration feeds that operation without a native build, child compiler or installed consumer.
func TestRuleCorpusPreferRegexpExec(t *testing.T) {
  root := seedLintProject(t, `declare const text: string;
const m = text.match(/foo/);
JSON.stringify(m);
`)
  seedLintRules(t, root, map[string]string{"typescript/prefer-regexp-exec": "error"})

  code, stdout, stderr := captureCommandOutput(t, func() int {
    return run([]string{
      "check",
      "--cwd", root,
      "--plugins-json", lintManifest(t),
    })
  })
  if code != 2 || stdout != "" || !strings.Contains(stderr, "[typescript/prefer-regexp-exec]") {
    t.Fatalf("prefer-regexp-exec diagnostic mismatch: code=%d stdout=%q stderr=%q", code, stdout, stderr)
  }
  assertTypedRuleRenderedErrors(t, "typescript/prefer-regexp-exec", stderr, 2)
  assertTypedRuleCleanSource(t, "typescript/prefer-regexp-exec", "declare const text: string;\nconst m = /foo/.exec(text);\n")
}