package queue

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

// MuteFileName is the mute file's name inside the config directory.
const MuteFileName = "mute"

// ErrNoMutePath reports a Set attempt without a configured file path (config
// directory unknown; the daemon then runs without mute and warns at start).
var ErrNoMutePath = errors.New("mute: no file path configured (config directory unknown)")

// MuteStore manages the persistent mute state as a file in the config
// directory: content "true" = muted, anything else (or no file) = not muted.
//
// The daemon re-reads the file on every /speak request, so a state written
// by the CLI while no daemon runs takes effect immediately, and the state
// survives daemon restarts.
type MuteStore struct {
	// Path is the mute file's full path. Empty (no config directory): Muted
	// is always false and Set an error.
	Path string
}

// Muted reports the persistent mute state. A missing or unreadable file
// means not muted: a broken setup must never be "accidentally silent".
func (s MuteStore) Muted() bool {
	if s.Path == "" {
		return false
	}
	b, err := os.ReadFile(s.Path)
	if err != nil {
		return false
	}
	return strings.TrimSpace(string(b)) == "true"
}

// Set writes the mute state atomically (temp file + rename, so daemon and
// CLI never read a half-written file) and creates the config directory if
// needed.
func (s MuteStore) Set(muted bool) error {
	if s.Path == "" {
		return ErrNoMutePath
	}
	dir := filepath.Dir(s.Path)
	if err := os.MkdirAll(dir, 0o755); err != nil {
		return err
	}
	content := "false\n"
	if muted {
		content = "true\n"
	}
	tmp, err := os.CreateTemp(dir, ".mute-*")
	if err != nil {
		return err
	}
	name := tmp.Name()
	if _, err := tmp.WriteString(content); err != nil {
		tmp.Close()
		os.Remove(name)
		return err
	}
	if err := tmp.Close(); err != nil {
		os.Remove(name)
		return err
	}
	if err := os.Chmod(name, 0o644); err != nil {
		os.Remove(name)
		return err
	}
	if err := os.Rename(name, s.Path); err != nil {
		os.Remove(name)
		return err
	}
	return nil
}