package cmd_test

// The CLI is tested the way the Python suite it replaces was: the binary is
// built once and run as a subprocess against a throwaway project somewhere
// else entirely.
//
// That separation IS the contract. A tool is installed in one place and used on
// projects in another, and the bug this discipline exists to catch — a store
// resolved from the executable's own directory rather than from the tree it was
// pointed at — is invisible to any test that runs the code in the directory it
// lives in.
//
// Every fixture also strips CLAUDE_PROJECT_DIR unless the test is about it: it
// is the first anchor of the walk, so the harness's own value would point every
// fixture at this repository.

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

var kettle string

func TestMain(m *testing.M) {
	dir, err := os.MkdirTemp("", "kettle-bin")
	if err != nil {
		panic(err)
	}
	defer os.RemoveAll(dir)

	kettle = filepath.Join(dir, "kettle")
	build := exec.Command("go", "build", "-o", kettle, "../../cmd/kettle")
	if out, err := build.CombinedOutput(); err != nil {
		panic("building kettle: " + err.Error() + "\n" + string(out))
	}
	os.Exit(m.Run())
}

type result struct {
	stdout, stderr string
	code           int
}

func (r result) out() string { return r.stdout + r.stderr }

// run invokes the binary in dir with a clean environment.
func run(t *testing.T, dir string, args ...string) result {
	t.Helper()
	return runWith(t, dir, nil, "", args...)
}

// runWith is run plus extra environment and standard input.
func runWith(t *testing.T, dir string, env []string, stdin string, args ...string) result {
	t.Helper()
	cmd := exec.Command(kettle, args...)
	cmd.Dir = dir
	cmd.Env = append(append(os.Environ(), "CLAUDE_PROJECT_DIR="), env...)
	if stdin != "" {
		cmd.Stdin = strings.NewReader(stdin)
	}

	var stdout, stderr strings.Builder
	cmd.Stdout, cmd.Stderr = &stdout, &stderr
	err := cmd.Run()

	code := 0
	var ee *exec.ExitError
	if err != nil {
		if !asExitError(err, &ee) {
			t.Fatalf("running kettle %v: %v", args, err)
		}
		code = ee.ExitCode()
	}
	return result{stdout.String(), stderr.String(), code}
}

func mustRun(t *testing.T, dir string, args ...string) result {
	t.Helper()
	r := run(t, dir, args...)
	if r.code != 0 {
		t.Fatalf("kettle %v exited %d:\n%s", args, r.code, r.out())
	}
	return r
}

// newProject makes an initialized project in a temp directory and returns it.
func newProject(t *testing.T) string {
	t.Helper()
	dir, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	mustRun(t, dir, "init")
	return dir
}

func TestInitIsIdempotentAndGitignoresTheStore(t *testing.T) {
	dir := newProject(t)

	for _, d := range []string{".kettle/issues", ".kettle/payload"} {
		if fi, err := os.Stat(filepath.Join(dir, d)); err != nil || !fi.IsDir() {
			t.Errorf("%s was not created", d)
		}
	}
	// An `origin: local` issue is the only copy of that work, and what goes in
	// a shared history is the operator's call, not this command's.
	ignore, err := os.ReadFile(filepath.Join(dir, ".gitignore"))
	if err != nil || !strings.Contains(string(ignore), ".kettle/") {
		t.Errorf(".kettle/ was not gitignored: %q", ignore)
	}

	again := mustRun(t, dir, "init")
	if !strings.Contains(again.stdout, "already initialized") {
		t.Errorf("a second init should be a no-op, got:\n%s", again.stdout)
	}
}

func TestNoMarkerIsReportedNotGuessed(t *testing.T) {
	dir := t.TempDir()
	r := run(t, dir, "check")

	if r.code == 0 {
		t.Fatal("a directory that is not a project must not read as an empty store")
	}
	// The operator is owed the directories the search began from — that is how
	// they see whether it began where they meant it to.
	if !strings.Contains(r.stderr, "no .kettle/ found") || !strings.Contains(r.stderr, dir) {
		t.Errorf("the failure must name what it searched:\n%s", r.stderr)
	}
}

func TestTheGoldenPath(t *testing.T) {
	dir := newProject(t)

	mustRun(t, dir, "new", "--type", "task", "--title", "Wire sqlc into the appclick layer")
	const id = "wire-sqlc-into-the-appclick-layer"

	if r := mustRun(t, dir, "check"); !strings.Contains(r.stdout, "ok    "+id) {
		t.Errorf("a fresh issue from its own template must validate:\n%s", r.out())
	}

	// Progress is counted off the body every time, never stored.
	mustRun(t, dir, "ac", id, "--check", "1")
	index, err := os.ReadFile(filepath.Join(dir, ".kettle", "issues", "INDEX.md"))
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(index), "| 1/2 |") {
		t.Errorf("the index did not pick up the ticked box:\n%s", index)
	}

	if r := mustRun(t, dir, "tree"); !strings.Contains(r.stdout, id) {
		t.Errorf("tree did not draw the issue:\n%s", r.stdout)
	}
}

func TestTickingABoxChangesOneByte(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Tick one box")
	path := filepath.Join(dir, ".kettle", "issues", "tick-one-box.md")

	before, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	mustRun(t, dir, "ac", "tick-one-box", "--check", "1")
	after, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}

	if len(before) != len(after) {
		t.Fatalf("length changed: %d -> %d", len(before), len(after))
	}
	diff := 0
	for i := range before {
		if before[i] != after[i] {
			diff++
		}
	}
	if diff != 1 {
		t.Errorf("%d bytes changed, want 1 — a tick must not re-render the file", diff)
	}

	// And back again, byte for byte: the metadata block is rewritten by nobody.
	mustRun(t, dir, "ac", "tick-one-box", "--uncheck", "1")
	back, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	if string(back) != string(before) {
		t.Error("unticking did not restore the file byte for byte")
	}
}

func TestFlagsWorkAfterPositionalArguments(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Order of arguments")

	// `kettle ac <id> --check 1` is how everybody types it. A flag silently
	// read as a positional would tick nothing and report success.
	r := mustRun(t, dir, "ac", "order-of-arguments", "--check", "1")
	if !strings.Contains(r.stdout, "checked") {
		t.Errorf("the flag after the id was ignored:\n%s", r.out())
	}
}

func TestTheStoreResolvesFromAnywhereInsideTheProject(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Seen from below")

	deep := filepath.Join(dir, "internal", "adapters")
	if err := os.MkdirAll(deep, 0o755); err != nil {
		t.Fatal(err)
	}
	r := mustRun(t, deep, "check")
	if !strings.Contains(r.stdout, "seen-from-below") {
		t.Errorf("a subdirectory saw a different store:\n%s", r.out())
	}
}

func TestADifferentProjectAnswersWithItsOwnStore(t *testing.T) {
	a, b := newProject(t), newProject(t)
	mustRun(t, a, "new", "--type", "task", "--title", "Belongs to A")
	mustRun(t, b, "new", "--type", "task", "--title", "Belongs to B")

	r := mustRun(t, b, "check")
	if strings.Contains(r.stdout, "belongs-to-a") {
		t.Errorf("project B saw project A's issues:\n%s", r.out())
	}
}

func TestALocalIssueIsNeverEvictedEvenWhenNamed(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Only copy there is")
	path := filepath.Join(dir, ".kettle", "issues", "only-copy-there-is.md")
	closeIssue(t, path)

	r := mustRun(t, dir, "evict", "only-copy-there-is")
	if _, err := os.Stat(path); err != nil {
		t.Fatal("a closed origin: local issue was deleted — that file IS the work")
	}
	if !strings.Contains(r.stdout, "kept") {
		t.Errorf("keeping it must be said out loud:\n%s", r.out())
	}
}

func TestAClosedTrackedIssueIsEvictedWithItsSidecars(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Done and elsewhere")
	store := filepath.Join(dir, ".kettle", "issues")
	path := filepath.Join(store, "done-and-elsewhere.md")
	closeIssue(t, path)
	setField(t, path, "origin", "gitea")

	sidecar := filepath.Join(store, "done-and-elsewhere.comments.md")
	if err := os.WriteFile(sidecar, []byte("# thread\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	// A dry run touches nothing, and says so.
	dry := mustRun(t, dir, "evict", "--dry-run")
	if !strings.Contains(dry.stdout, "would evict") {
		t.Errorf("dry run said nothing:\n%s", dry.out())
	}
	if _, err := os.Stat(path); err != nil {
		t.Fatal("a dry run deleted the issue")
	}

	mustRun(t, dir, "evict")
	if _, err := os.Stat(path); err == nil {
		t.Error("the issue survived eviction")
	}
	// The domain does not need to know what a comment thread is to know a file
	// named after this issue goes when it goes.
	if _, err := os.Stat(sidecar); err == nil {
		t.Error("the sidecar was left behind")
	}
}

func TestCheckExitsNonZeroOnAMalformedIssue(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Loses its type")
	path := filepath.Join(dir, ".kettle", "issues", "loses-its-type.md")
	setField(t, path, "labels", "[]")

	r := run(t, dir, "check")
	if r.code != 1 {
		t.Errorf("exit = %d, want 1 — this is what makes check usable in a hook", r.code)
	}
	if !strings.Contains(r.stdout, "need exactly one type/* label") {
		t.Errorf("the finding was not reported:\n%s", r.out())
	}
}

func TestNewRefusesToOverwriteAnExistingIssue(t *testing.T) {
	dir := newProject(t)
	mustRun(t, dir, "new", "--type", "task", "--title", "Same title twice")
	// Without an explicit id the slug is allocated around the collision…
	mustRun(t, dir, "new", "--type", "task", "--title", "Same title twice")
	if _, err := os.Stat(filepath.Join(dir, ".kettle", "issues", "same-title-twice-2.md")); err != nil {
		t.Error("the second issue did not get its own slug")
	}
	// …but an id typed by hand is taken literally, and taken means taken.
	r := run(t, dir, "new", "--type", "task", "--title", "Third", "--id", "same-title-twice")
	if r.code == 0 || !strings.Contains(r.stderr, "already exists") {
		t.Errorf("an explicit id must not overwrite:\n%s", r.out())
	}
}

// An older layout is migrated in, and it is a MOVE: a store left behind at the
// old path is a store somebody will edit by accident months later.
func TestInitMigratesAnOlderStore(t *testing.T) {
	dir, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	old := filepath.Join(dir, ".tea", "issues")
	if err := os.MkdirAll(old, 0o755); err != nil {
		t.Fatal(err)
	}
	const body = "---\nid: from-the-old-store\nstate: open\nlabels: [type/task]\norigin: local\n---\n# From the old store\n\n## Summary\nx\n\n## Spec\nnone\n\n## Acceptance criteria\n- [ ] x\n"
	if err := os.WriteFile(filepath.Join(old, "from-the-old-store.md"), []byte(body), 0o644); err != nil {
		t.Fatal(err)
	}

	r := mustRun(t, dir, "init")
	if !strings.Contains(r.stdout, "moved 1 file(s)") {
		t.Errorf("the migration said nothing:\n%s", r.stdout)
	}
	if _, err := os.Stat(filepath.Join(dir, ".kettle", "issues", "from-the-old-store.md")); err != nil {
		t.Fatal("the issue did not arrive in the new store")
	}
	if _, err := os.Stat(old); err == nil {
		t.Error("the old store is still there — two stores is what the marker exists to prevent")
	}
	if r := mustRun(t, dir, "check"); !strings.Contains(r.stdout, "from-the-old-store") {
		t.Errorf("the migrated issue is not readable:\n%s", r.out())
	}
}

// A migration never picks a winner. Two files of the same name are two versions
// of one issue, and choosing quietly is how the wrong one survives.
func TestInitRefusesToResolveAMigrationClash(t *testing.T) {
	dir := newProject(t)
	old := filepath.Join(dir, ".tea", "issues")
	if err := os.MkdirAll(old, 0o755); err != nil {
		t.Fatal(err)
	}
	mustRun(t, dir, "new", "--type", "task", "--title", "Both sides have this")
	if err := os.WriteFile(filepath.Join(old, "both-sides-have-this.md"), []byte("older\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	r := run(t, dir, "init")
	if r.code == 0 {
		t.Fatal("a clash must stop the run")
	}
	if !strings.Contains(r.stderr, "both hold") || !strings.Contains(r.stderr, "nothing was changed") {
		t.Errorf("the clash was not explained:\n%s", r.stderr)
	}
	if _, err := os.Stat(filepath.Join(old, "both-sides-have-this.md")); err != nil {
		t.Error("the older file was moved anyway")
	}
}

func TestInitWritesTheConfigAndKeepsWhatItWasNotGiven(t *testing.T) {
	dir, err := filepath.EvalSymlinks(t.TempDir())
	if err != nil {
		t.Fatal(err)
	}
	mustRun(t, dir, "init", "--login", "noodles", "--repo", "claude-skills/marketplace")

	cfg := filepath.Join(dir, ".kettle", "config.yaml")
	raw, err := os.ReadFile(cfg)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), "login: noodles") ||
		!strings.Contains(string(raw), "repo: claude-skills/marketplace") {
		t.Fatalf("config did not record what it was given:\n%s", raw)
	}

	// Re-running init to change one setting must not drop the other.
	mustRun(t, dir, "init", "--repo", "claude-skills/other")
	raw, err = os.ReadFile(cfg)
	if err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(string(raw), "login: noodles") {
		t.Errorf("the pinned login was dropped by an unrelated init:\n%s", raw)
	}
	if !strings.Contains(string(raw), "repo: claude-skills/other") {
		t.Errorf("the repository was not updated:\n%s", raw)
	}
}

func TestInitRefusesAMalformedRepo(t *testing.T) {
	dir := t.TempDir()
	r := run(t, dir, "init", "--repo", "marketplace")
	if r.code == 0 || !strings.Contains(r.stderr, "owner/name") {
		t.Errorf("a repo without an owner must be rejected before anything is written:\n%s", r.out())
	}
	if _, err := os.Stat(filepath.Join(dir, ".kettle")); err == nil {
		t.Error("the marker was created despite the bad argument")
	}
}

// The project pins a login by NAME. The credential lives in one file per
// machine, outside every working tree — a token in a repository ends up in a
// commit, and a secret that has been pushed has to be rotated.
func TestTokensNeverLandInTheProject(t *testing.T) {
	dir := newProject(t)
	home := t.TempDir()
	env := []string{"KETTLE_CONFIG_HOME=" + home}

	runWith(t, dir, env, "s3cr3t-token\n", "auth", "add",
		"--name", "noodles", "--url", "https://git.example.com/")
	mustRun(t, dir, "init", "--login", "noodles", "--repo", "owner/name")

	logins, err := os.ReadFile(filepath.Join(home, "logins.yaml"))
	if err != nil {
		t.Fatal("the token file was not written where it was told to go")
	}
	if !strings.Contains(string(logins), "s3cr3t-token") {
		t.Errorf("the token was not stored:\n%s", logins)
	}
	if fi, err := os.Stat(filepath.Join(home, "logins.yaml")); err != nil || fi.Mode().Perm() != 0o600 {
		t.Errorf("the token file must be 0600, got %v", fi.Mode().Perm())
	}

	cfg, err := os.ReadFile(filepath.Join(dir, ".kettle", "config.yaml"))
	if err != nil {
		t.Fatal(err)
	}
	if strings.Contains(string(cfg), "s3cr3t-token") {
		t.Fatal("the token was written into the project — that file ends up in a commit")
	}

	// And nothing prints it back, either.
	shown := runWith(t, dir, env, "", "config")
	if strings.Contains(shown.out(), "s3cr3t-token") {
		t.Errorf("`kettle config` printed the token:\n%s", shown.out())
	}
	if !strings.Contains(shown.stdout, "https://git.example.com") {
		t.Errorf("the resolved URL was not shown:\n%s", shown.out())
	}
	if !strings.Contains(shown.stdout, "token     (set)") {
		t.Errorf("whether a token was found must still be visible:\n%s", shown.stdout)
	}
}

func TestAuthListNeverPrintsATokenAndRemoveForgetsIt(t *testing.T) {
	dir := newProject(t)
	home := t.TempDir()
	env := []string{"KETTLE_CONFIG_HOME=" + home}

	runWith(t, dir, env, "s3cr3t-token\n", "auth", "add", "--name", "noodles", "--url", "https://git.example.com")
	listed := runWith(t, dir, env, "", "auth", "list")
	if strings.Contains(listed.out(), "s3cr3t-token") {
		t.Errorf("`auth list` printed a token:\n%s", listed.out())
	}
	if !strings.Contains(listed.stdout, "noodles") {
		t.Errorf("`auth list` did not list the login:\n%s", listed.out())
	}

	runWith(t, dir, env, "", "auth", "remove", "noodles")
	after := runWith(t, dir, env, "", "auth", "list")
	if strings.Contains(after.stdout, "noodles") {
		t.Errorf("the login survived removal:\n%s", after.stdout)
	}
}

// A pinned login that is not on this machine is a fixable mistake, and the
// message has to say which file was read and what it holds.
func TestAMissingLoginIsExplained(t *testing.T) {
	dir := newProject(t)
	home := t.TempDir()
	env := []string{"KETTLE_CONFIG_HOME=" + home}
	mustRun(t, dir, "init", "--login", "absent", "--repo", "owner/name")

	r := runWith(t, dir, env, "", "config")
	if r.code == 0 {
		t.Fatal("a login that does not exist must not resolve")
	}
	if !strings.Contains(r.stderr, `no login "absent"`) || !strings.Contains(r.stderr, "kettle auth add") {
		t.Errorf("the failure must name the file and the fix:\n%s", r.stderr)
	}
}

func closeIssue(t *testing.T, path string) {
	t.Helper()
	setField(t, path, "state", "closed")
}

func setField(t *testing.T, path, key, value string) {
	t.Helper()
	raw, err := os.ReadFile(path)
	if err != nil {
		t.Fatal(err)
	}
	lines := strings.Split(string(raw), "\n")
	for i, line := range lines {
		if strings.HasPrefix(line, key+": ") {
			lines[i] = key + ": " + value
		}
	}
	if err := os.WriteFile(path, []byte(strings.Join(lines, "\n")), 0o644); err != nil {
		t.Fatal(err)
	}
}

func asExitError(err error, target **exec.ExitError) bool {
	ee, ok := err.(*exec.ExitError)
	if ok {
		*target = ee
	}
	return ok
}