package main

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

// The read-only halves of `backup` answer WITHOUT a DSN, and that is the property the command was
// shaped around: a restore point copied onto another machine is still a restore point, and the moment
// somebody asks "what have we actually got" is not the moment to require a working database.
//
// ⚠ It is dispatched before the DSN gate in run() for exactly this, and nothing checked it. Mutation
// caught: moving the `backup` case below `config.Secret("TM_PLATFORM_DSN")` — every operator use
// still works on a configured host, and the one case this exists for stops working.
func TestListingAndVerifyingRestorePointsNeedsNoDatabase(t *testing.T) {
	t.Setenv("TM_PLATFORM_DSN", "")
	t.Setenv("TM_PLATFORM_DSN_FILE", "")
	t.Setenv("TM_PLATFORM_BACKUP_DIR", "")
	dir := t.TempDir()

	var out strings.Builder
	if err := run([]string{"backup", "--list", "--dir", dir}, &out); err != nil {
		t.Fatalf("--list refused without a DSN: %v", err)
	}
	if !strings.Contains(out.String(), "no restore points") {
		t.Errorf("--list on an empty directory said: %q", out.String())
	}

	// A directory that is not a restore point is REPORTED, not crashed on: this is the command an
	// operator reaches for when things are already wrong.
	point := filepath.Join(dir, "20260905T120000Z")
	if err := os.MkdirAll(point, 0o750); err != nil {
		t.Fatal(err)
	}
	out.Reset()
	if err := run([]string{"backup", "--list", "--dir", dir}, &out); err != nil {
		t.Fatalf("--list on an unreadable point refused: %v", err)
	}
	if !strings.Contains(out.String(), "UNREADABLE") {
		t.Errorf("a point with no manifest was not reported as unreadable: %q", out.String())
	}

	// And --verify FAILS on it rather than reporting it sound.
	out.Reset()
	if err := run([]string{"backup", "--verify", "20260905T120000Z", "--dir", dir}, &out); err == nil {
		t.Errorf("--verify called a point with no manifest sound: %q", out.String())
	}
}

// Without a directory and without the variable, the command says which of the two is missing instead
// of failing somewhere deeper.
func TestBackupSaysWhenItDoesNotKnowWhereToLook(t *testing.T) {
	t.Setenv("TM_PLATFORM_DSN", "")
	t.Setenv("TM_PLATFORM_BACKUP_DIR", "")
	var out strings.Builder
	err := run([]string{"backup", "--list"}, &out)
	if err == nil {
		t.Fatal("listing with nowhere to look was accepted")
	}
	if !strings.Contains(err.Error(), "TM_PLATFORM_BACKUP_DIR") || !strings.Contains(err.Error(), "--dir") {
		t.Errorf("the error names neither way to say where: %v", err)
	}
}

// ⚠ THERE IS NO `restore` SUBCOMMAND, and its absence is a decision this test defends. A restore
// replaces a live database and a live library on the worst day this deployment has; a one-word
// command for that is a one-word command for destroying the current state by mistake. The procedure
// lives in deploy/README.md and inside the point's own manifest.
func TestThereIsNoOneWordRestoreCommand(t *testing.T) {
	// ⚠ WITH a database, and that is not decoration: with `TM_PLATFORM_DSN` unset the dispatcher
	// refuses at the DSN gate before it ever looks at the subcommand, so the test would pass over a
	// `restore` command that existed. Acceptance caught exactly that — the assertion below now
	// reaches the thing it is about.
	t.Setenv("TM_PLATFORM_DSN", freshDB(t))
	var out strings.Builder
	err := run([]string{"restore"}, &out)
	if err == nil {
		t.Fatal("a `restore` command exists; the runbook's deliberate absence has been undone")
	}
	if !errors.Is(err, errUsage) {
		t.Errorf("`restore` was refused for some reason other than being unknown: %v", err)
	}
	if !strings.Contains(usage, "backup") {
		t.Error("usage does not mention the backup command at all")
	}
	// ⚠ Checked as a COMMAND line and not as a substring: the first version of this assertion searched
	// for "restore " anywhere in the usage and matched the phrase "restore point" inside `backup`'s own
	// description — a red test over correct code, which is the same class of wrong as a green test over
	// broken code.
	for _, line := range strings.Split(usage, "\n") {
		if strings.HasPrefix(strings.TrimLeft(line, " "), "restore") {
			t.Errorf("usage advertises a restore command: %q", line)
		}
	}
}