// Package pushnotify owns mobile push notification delivery: storage of per-device
// Expo push tokens, and the worker-side orchestration of sending notifications
// to offline recipients via the Expo Push API.
package pushnotify

import (
	"errors"
	"strings"
	"time"
)

type Platform string

const (
	PlatformIOS     Platform = "ios"
	PlatformAndroid Platform = "android"
)

func (p Platform) Valid() bool {
	return p == PlatformIOS || p == PlatformAndroid
}

type PushToken struct {
	Token      string
	HumanID    string
	Platform   Platform
	AppVersion string
	CreatedAt  time.Time
	LastSeenAt time.Time
}

var (
	ErrInvalidPlatform = errors.New("invalid platform")
	ErrInvalidToken    = errors.New("invalid expo push token")
	ErrNotFound        = errors.New("push token not found")
)

// IsValidExpoToken matches the two prefix formats Expo currently uses.
// We don't validate the inner contents — Expo's server will reject malformed
// tokens with a per-message error and we'll clean those up via DeviceNotRegistered.
func IsValidExpoToken(token string) bool {
	return strings.HasPrefix(token, "ExponentPushToken[") || strings.HasPrefix(token, "ExpoPushToken[")
}