package cmd_test

// What `kettle init` writes beyond the marker: the .claude/ tree, the record of
// which build wrote it, and the optional mirror hook. Plus the two refusals that
// used to be prose in a skill and are now the binary's.

import (
	"encoding/json"
	"os"
	"path/filepath"
	"strings"
	"testing"
)

func TestInitWritesTheClaudeTreeByDefault(t *testing.T) {
	dir := t.TempDir()
	r := mustRun(t, dir, "init")

	for _, rel := range scaffoldFiles {
		if _, err := os.Stat(filepath.Join(dir, ".claude", filepath.FromSlash(rel))); err != nil {
			t.Errorf("%s was not written: %v\n%s", rel, err, r.out())
		}
	}

	// And the record of what wrote it, which is the only way an operator can
	// tell a current tree from one four releases old.
	stamp := readFile(t, filepath.Join(dir, ".kettle", "scaffold.yaml"))
	for _, want := range []string{"version:", "out: .claude"} {
		if !strings.Contains(stamp, want) {
			t.Errorf("the scaffold record is missing %q:\n%s", want, stamp)
		}
	}
	if cfg := mustRun(t, dir, "config"); !strings.Contains(cfg.stdout, "scaffold  .claude") {
		t.Errorf("`kettle config` does not report the tree:\n%s", cfg.stdout)
	}

	// Idempotent all the way through: a second init rewrites nothing.
	second := mustRun(t, dir, "init")
	if strings.Contains(second.stdout, "updated") {
		t.Errorf("a second init rewrote a document:\n%s", second.out())
	}
}

func TestInitCanBeToldToWriteNoTreeAtAll(t *testing.T) {
	dir := t.TempDir()
	mustRun(t, dir, "init", "--no-scaffold")

	if _, err := os.Stat(filepath.Join(dir, ".claude")); err == nil {
		t.Error("--no-scaffold still wrote the tree")
	}
	if _, err := os.Stat(filepath.Join(dir, ".kettle", "scaffold.yaml")); err == nil {
		t.Error("--no-scaffold recorded a tree it did not write")
	}
	// Nothing else is affected: this is still a project.
	if _, err := os.Stat(filepath.Join(dir, ".kettle", "issues")); err != nil {
		t.Errorf("--no-scaffold skipped the store as well: %v", err)
	}
	// And `kettle config` says so rather than saying nothing.
	if cfg := mustRun(t, dir, "config"); !strings.Contains(cfg.stdout, "scaffold  (none written") {
		t.Errorf("`kettle config` is silent about the missing tree:\n%s", cfg.stdout)
	}
}

func TestInitScaffoldOutIsUsedAsTyped(t *testing.T) {
	dir := t.TempDir()
	elsewhere := filepath.Join(dir, "somewhere", "else")

	mustRun(t, dir, "init", "--scaffold-out", elsewhere)
	if _, err := os.Stat(filepath.Join(elsewhere, "skills", "kettle-issue", "SKILL.md")); err != nil {
		t.Errorf("the tree did not go where it was told: %v", err)
	}
	if _, err := os.Stat(filepath.Join(dir, ".claude")); err == nil {
		t.Error("it went to the default as well")
	}
}

func TestInitDryRunWritesNoTreeAndNoRecord(t *testing.T) {
	dir := t.TempDir()

	r := mustRun(t, dir, "init", "--dry-run", "--mirror-hook")
	if !strings.Contains(r.stdout, "would create") {
		t.Errorf("the dry run said nothing about the tree:\n%s", r.out())
	}
	for _, p := range []string{".claude", ".kettle"} {
		if _, err := os.Stat(filepath.Join(dir, p)); err == nil {
			t.Errorf("a dry run created %s", p)
		}
	}
}

// The mirror hook: offered, never assumed. A project that keeps no AGENTS.md
// files wants nothing to do with it.
func TestInitRegistersTheMirrorHookOnlyWhenAsked(t *testing.T) {
	plain := t.TempDir()
	mustRun(t, plain, "init")
	if _, err := os.Stat(filepath.Join(plain, ".claude", "settings.json")); err == nil {
		t.Error("init registered a hook nobody asked for")
	}

	asked := t.TempDir()
	mustRun(t, asked, "init", "--mirror-hook")
	body := readFile(t, filepath.Join(asked, ".claude", "settings.json"))

	var settings struct {
		Hooks struct {
			PreToolUse []struct {
				Matcher string `json:"matcher"`
				Hooks   []struct {
					Type    string `json:"type"`
					Command string `json:"command"`
				} `json:"hooks"`
			} `json:"PreToolUse"`
		} `json:"hooks"`
	}
	if err := json.Unmarshal([]byte(body), &settings); err != nil {
		t.Fatalf("the settings file is not valid JSON: %v\n%s", err, body)
	}
	if len(settings.Hooks.PreToolUse) != 1 || settings.Hooks.PreToolUse[0].Matcher != "Bash" {
		t.Fatalf("the hook is not registered on PreToolUse(Bash):\n%s", body)
	}
	command := settings.Hooks.PreToolUse[0].Hooks[0].Command
	if !strings.Contains(command, "kettle mirror --hook") {
		t.Errorf("the registered command is %q", command)
	}
	// The guard outlives the binary: an operator who uninstalls kettle must not
	// get "command not found" on every Bash call from a hook they set up months
	// ago and have stopped thinking about.
	if !strings.Contains(command, "command -v kettle") {
		t.Errorf("the registered command has no guard against kettle being gone: %q", command)
	}
}

// settings.json is a file the operator owns and commits, and Go cannot preserve
// its key order. So an existing one is never rewritten without being asked
// twice: the run reports what it did not do, prints the snippet, and succeeds.
func TestInitRefusesToRewriteAnExistingSettingsFile(t *testing.T) {
	dir := t.TempDir()
	settings := filepath.Join(dir, ".claude", "settings.json")
	if err := os.MkdirAll(filepath.Dir(settings), 0o755); err != nil {
		t.Fatal(err)
	}
	const theirs = `{ "permissions": { "allow": ["Bash(ls:*)"] } }`
	if err := os.WriteFile(settings, []byte(theirs), 0o644); err != nil {
		t.Fatal(err)
	}

	r := mustRun(t, dir, "init", "--mirror-hook")
	if got := readFile(t, settings); got != theirs {
		t.Errorf("the operator's settings file was rewritten:\n%s", got)
	}
	if !strings.Contains(r.stderr, "kettle mirror") {
		t.Errorf("the refusal did not print the snippet to paste:\n%s", r.out())
	}
	if !strings.Contains(r.stderr, "--force-settings") {
		t.Errorf("the refusal did not name the way past it:\n%s", r.out())
	}
	// Everything before the hook still happened; this is a decision, not a
	// failure, and reporting it as one would send somebody looking for damage.
	if _, err := os.Stat(filepath.Join(dir, ".kettle", "issues")); err != nil {
		t.Error("the refusal rolled back the rest of the run")
	}

	// Asked twice, it merges — and keeps what was already in the file.
	mustRun(t, dir, "init", "--mirror-hook", "--force-settings")
	merged := readFile(t, settings)
	if !strings.Contains(merged, "kettle mirror") {
		t.Errorf("--force-settings did not add the hook:\n%s", merged)
	}
	if !strings.Contains(merged, "Bash(ls:*)") {
		t.Errorf("--force-settings dropped what was already there:\n%s", merged)
	}

	// And a third run adds nothing: the hook is already there.
	mustRun(t, dir, "init", "--mirror-hook")
	if again := readFile(t, settings); again != merged {
		t.Errorf("a re-run duplicated the hook:\n%s", again)
	}
}

// The rule that used to be a paragraph in a skill an operator had to read. The
// wizard is the front door now, and a front door cannot assume anybody read
// anything.
func TestInitRefusesALinkedWorktree(t *testing.T) {
	main := t.TempDir()
	worktree := filepath.Join(main, "wt")
	gitdir := filepath.Join(main, ".git", "worktrees", "wt")
	if err := os.MkdirAll(gitdir, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.MkdirAll(worktree, 0o755); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(gitdir, "commondir"), []byte("../..\n"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := os.WriteFile(filepath.Join(worktree, ".git"), []byte("gitdir: "+gitdir+"\n"), 0o644); err != nil {
		t.Fatal(err)
	}

	r := run(t, worktree, "init")
	if r.code == 0 {
		t.Fatalf("init in a linked worktree must be refused:\n%s", r.out())
	}
	if !strings.Contains(r.stderr, main) {
		t.Errorf("the refusal does not name the main checkout to use instead:\n%s", r.out())
	}
	if _, err := os.Stat(filepath.Join(worktree, ".kettle")); err == nil {
		t.Error("the refused run created a second marker anyway")
	}
}

// --interactive is for a person. Under a test harness, a script or an agent,
// standard input is a pipe and the answer is an error that names the flags
// rather than a prompt nobody will ever answer.
func TestInteractiveRefusesWhatIsNotATerminal(t *testing.T) {
	dir := t.TempDir()

	r := runWith(t, dir, nil, "\n\n\n", "init", "--interactive")
	if r.code == 0 {
		t.Fatalf("--interactive succeeded without a terminal:\n%s", r.out())
	}
	if !strings.Contains(r.stderr, "terminal") {
		t.Errorf("the refusal does not say what is missing:\n%s", r.out())
	}
	for _, flag := range []string{"--login", "--repo", "--mirror-hook"} {
		if !strings.Contains(r.stderr, flag) {
			t.Errorf("the refusal does not name %s, which is the way through:\n%s", flag, r.out())
		}
	}
	if _, err := os.Stat(filepath.Join(dir, ".kettle")); err == nil {
		t.Error("the refused run initialized the directory anyway")
	}
}