package configkit

import (
	"bytes"
	"os"
	"os/exec"
	"path/filepath"
	"strings"
	"testing"
)

func TestCheckScriptsHandleFilenamesAndStopOnFailure(t *testing.T) {
	for _, scriptName := range []string{"release-check.sh", "check.sh"} {
		t.Run(scriptName, func(t *testing.T) {
			script, err := os.ReadFile("scripts/" + scriptName)
			if err != nil {
				t.Fatal(err)
			}
			for _, name := range []string{"success", "failed-go-check", "untracked-whitespace"} {
				fail := name != "success"
				t.Run(name, func(t *testing.T) {
					root := t.TempDir()
					bin := t.TempDir()
					log := filepath.Join(bin, "gofmt.args")
					calls := filepath.Join(bin, "go.calls")
					for _, directory := range []string{"scripts", "nested"} {
						if err := os.Mkdir(filepath.Join(root, directory), 0700); err != nil {
							t.Fatal(err)
						}
					}
					write := func(path string, data []byte, mode os.FileMode) {
						t.Helper()
						if err := os.WriteFile(path, data, mode); err != nil {
							t.Fatal(err)
						}
					}
					write(filepath.Join(root, "scripts", scriptName), script, 0700)
					write(filepath.Join(root, "go.mod"), []byte("module example.invalid/check\n"), 0600)
					write(filepath.Join(root, "go.sum"), nil, 0600)
					write(filepath.Join(root, "obsolete.go"), []byte("package obsolete\n"), 0600)
					files := []string{"nested/a space.go", "nested/a\nnewline.go"}
					for _, file := range files {
						write(filepath.Join(root, file), []byte("package example\n"), 0600)
					}
					if name == "untracked-whitespace" {
						write(filepath.Join(root, "notes.md"), []byte("trailing space \n"), 0600)
					}
					// Isolate expensive toolchain commands: this test owns shell orchestration,
					// not Go's compiler or the production tests exercised by the real checker.
					write(filepath.Join(bin, "go"), []byte("#!/bin/sh\nprintf '%s/%s %s\\n' \"${GOOS-native}\" \"${GOARCH-native}\" \"$*\" >> \"$CONFIGKIT_TEST_GO_LOG\"\nif [ \"${CONFIGKIT_TEST_FAIL-}\" = yes ] && [ \"${1-}\" = test ]; then exit 37; fi\n"), 0700)
					write(filepath.Join(bin, "gofmt"), []byte("#!/bin/sh\nprintf '%s\\000' \"$@\" > \"$CONFIGKIT_TEST_FMT_LOG\"\n"), 0700)
					init := exec.Command("git", "init", "-q")
					init.Dir = root
					if out, err := init.CombinedOutput(); err != nil {
						t.Fatalf("git init: %v %s", err, out)
					}
					// HEAD is required by the whitespace gate. Commit only the module baseline.
					for _, args := range [][]string{{"add", "go.mod", "go.sum", "obsolete.go"}, {"-c", "user.name=Test", "-c", "user.email=test@example.invalid", "-c", "commit.gpgsign=false", "commit", "-qm", "Test fixture"}} {
						cmd := exec.Command("git", args...)
						cmd.Dir = root
						if out, err := cmd.CombinedOutput(); err != nil {
							t.Fatalf("git fixture: %v %s", err, out)
						}
					}
					if err := os.Remove(filepath.Join(root, "obsolete.go")); err != nil {
						t.Fatal(err)
					}
					cmd := exec.Command("/bin/bash", filepath.Join(root, "scripts", scriptName))
					cmd.Env = append(os.Environ(), "PATH="+bin+string(os.PathListSeparator)+os.Getenv("PATH"), "CONFIGKIT_BASELINE_TOOLCHAIN=test-baseline", "CONFIGKIT_NEWER_TOOLCHAIN=test-newer", "CONFIGKIT_TEST_FMT_LOG="+log, "CONFIGKIT_TEST_GO_LOG="+calls)
					// Log only targets selected by the script, not inherited host settings.
					cmd.Env = append(cmd.Env, "GOOS=", "GOARCH=")
					if name == "failed-go-check" {
						cmd.Env = append(cmd.Env, "CONFIGKIT_TEST_FAIL=yes")
					}
					out, err := cmd.CombinedOutput()
					if fail {
						if err == nil {
							t.Fatal("checker ignored failed Go test")
						}
					} else if err != nil {
						t.Fatalf("checker: %v %s", err, out)
					}
					arguments, err := os.ReadFile(log)
					if err != nil {
						t.Fatal(err)
					}
					parts := bytes.Split(arguments, []byte{0})
					for _, file := range files {
						found := false
						for _, arg := range parts {
							if string(arg) == file {
								found = true
							}
						}
						if !found {
							t.Fatalf("filename was split: %q", file)
						}
					}
					invoked, err := os.ReadFile(calls)
					if err != nil {
						t.Fatal(err)
					}
					if fail && strings.Contains(string(invoked), "vet ./...") {
						t.Fatal("checker continued after failed test")
					}
					if scriptName == "release-check.sh" && !fail {
						// These are selected release gates, not incidental loop details.
						for _, target := range []string{"linux/amd64", "linux/arm64"} {
							if !strings.Contains(string(invoked), target+" build ./...") {
								t.Errorf("checker omitted required target %s", target)
							}
						}
						if strings.Contains(string(invoked), "darwin/") {
							t.Fatal("checker requires best-effort macOS validation")
						}
					}
				})
			}
		})
	}
}