package cmd

import (
	"os"
	"path/filepath"
)

// invocationNameOverride lets tests fix the binary name surfaced in
// user-facing hint and refusal messages. Production code leaves it empty
// so the live os.Args[0] basename is used.
//
// Tests that assert on specific hint substrings (e.g. "ctask attach
// <slug>") must set this to "ctask" via t.Cleanup; otherwise the test
// binary's name (e.g. "cmd.test") will surface in the hint and the
// substring will not match. Do not run such tests in t.Parallel — this
// is a package global.
var invocationNameOverride string

// invocationName returns the binary name to render in user-facing
// command suggestions ("<name> new <workspace> --direct",
// "<name> attach <slug>", etc.). It returns the basename of os.Args[0]
// so the hint reads cleanly regardless of invocation form: `./ctask`,
// `.\ctask.exe`, `/usr/local/bin/ctask`, and an installed `ctask` on
// PATH all surface as `ctask` (or `ctask.exe` on Windows). The slight
// loss of paste-ability for explicit-path invocations (the user has to
// re-prepend their `./` or `.\`) is the trade for a clean, predictable
// hint that matches the canonical install case.
//
// Falls back to "ctask" when argv is empty (a degenerate state — should
// not happen in normal execution, but defensive against odd embeddings).
func invocationName() string {
	if invocationNameOverride != "" {
		return invocationNameOverride
	}
	if len(os.Args) == 0 || os.Args[0] == "" {
		return "ctask"
	}
	return filepath.Base(os.Args[0])
}