// Package render turns a backend push event into a localized Telegram message with
// a Mini App deep-link. Only the out-of-app push set is rendered (your_turn, nudge,
// match_found, and the invitation / friend_request notify sub-kinds); every other
// kind returns ok=false so the connector skips it (the in-app stream still carries
// it).
package render

import (
	"scrabble/pkg/fbs/scrabblefb"
	"scrabble/platform/telegram/internal/deeplink"
)

// Message is a rendered notification: the body text, the launch-button label and
// the deep-link start parameter (empty opens the lobby).
type Message struct {
	Text       string
	ButtonText string
	StartParam string
}

// Render builds the localized message for a backend push event of the given kind
// and FlatBuffers payload, in language lang ("ru" selects Russian; anything else
// is English). It returns ok=false for a kind that is not delivered out-of-app.
func Render(kind string, payload []byte, lang string) (Message, bool) {
	p := english
	if lang == "ru" {
		p = russian
	}
	switch kind {
	case "your_turn":
		ev := scrabblefb.GetRootAsYourTurnEvent(payload, 0)
		return Message{Text: p.yourTurn, ButtonText: p.openGame, StartParam: deeplink.Game(string(ev.GameId()))}, true
	case "nudge":
		ev := scrabblefb.GetRootAsNudgeEvent(payload, 0)
		return Message{Text: p.nudge, ButtonText: p.openGame, StartParam: deeplink.Game(string(ev.GameId()))}, true
	case "match_found":
		ev := scrabblefb.GetRootAsMatchFoundEvent(payload, 0)
		return Message{Text: p.matchFound, ButtonText: p.openGame, StartParam: deeplink.Game(string(ev.GameId()))}, true
	case "notify":
		ev := scrabblefb.GetRootAsNotificationEvent(payload, 0)
		switch string(ev.Kind()) {
		case "invitation":
			return Message{Text: p.invitation, ButtonText: p.open}, true
		case "friend_request":
			return Message{Text: p.friendRequest, ButtonText: p.open}, true
		}
	}
	return Message{}, false
}

// phrases is one language's message catalog.
type phrases struct {
	yourTurn      string
	nudge         string
	matchFound    string
	invitation    string
	friendRequest string
	openGame      string
	open          string
}

var english = phrases{
	yourTurn:      "It's your turn.",
	nudge:         "You were nudged — it's your turn.",
	matchFound:    "Your game is ready.",
	invitation:    "You have a new game invitation.",
	friendRequest: "You have a new friend request.",
	openGame:      "Open game",
	open:          "Open",
}

var russian = phrases{
	yourTurn:      "Ваш ход.",
	nudge:         "Вас поторопили — ваш ход.",
	matchFound:    "Игра найдена.",
	invitation:    "Вас пригласили в игру.",
	friendRequest: "Вам пришла заявка в друзья.",
	openGame:      "Открыть игру",
	open:          "Открыть",
}