package main

import (
	"context"
	"database/sql"
	"encoding/json"

	"github.com/heroiclabs/nakama-common/runtime"
)

type MatchmakingTicket struct {
	UserID string `json:"user_id"`
	Mode   string `json:"mode"`
}

// MatchmakerMatched is triggered automatically when enough players form a match.
func MatchmakerMatched(
	ctx context.Context,
	logger runtime.Logger,
	db *sql.DB,
	nk runtime.NakamaModule,
	entries []runtime.MatchmakerEntry,
) (string, error) {

	if len(entries) != 2 {
		logger.Warn("MatchmakerMatched triggered but incorrect player count: %d", len(entries))
		return "", runtime.NewError("requires exactly 2 players", 3)
	}

	// Extract player data
	ticketA := entries[0]
	ticketB := entries[1]

	propsA := ticketA.GetProperties()
	propsB := ticketB.GetProperties()

	modeA, okA := propsA["mode"].(string)
	modeB, okB := propsB["mode"].(string)

	if !okA || !okB {
		logger.Error("Matchmaker ticket missing mode property")
		return "", runtime.NewError("matchmaking requires game mode", 13)
	}

	// ✅ Ensure both players queued for the same mode
	if modeA != modeB {
		logger.Warn("Players queued for different modes: %s != %s", modeA, modeB)
		return "", runtime.NewError("players must select same mode", 3)
	}

	matchParams := map[string]interface{}{
		"mode": modeA,
	}

	// ✅ Create authoritative match instance
	matchID, err := nk.MatchCreate(ctx, "tictactoe", matchParams)
	if err != nil {
		logger.Error("MatchCreate failed: %v", err)
		return "", runtime.NewError("failed to create match", 13)
	}

	logger.Info("✅ Match created: %s — mode=%s — players=%s, %s",
		matchID,
		modeA,
		ticketA.GetPresence().GetUserId(),
		ticketB.GetPresence().GetUserId(),
	)

	// ✅ Return match ID so Nakama notifies clients over WebSocket
	return matchID, nil
}

// RPC to leave matchmaking queue
func rpcLeaveMatchmaking(
	ctx context.Context,
	logger runtime.Logger,
	db *sql.DB,
	nk runtime.NakamaModule,
	payload string,
) (string, error) {

	var input struct {
		Ticket string `json:"ticket"`
	}

	if err := json.Unmarshal([]byte(payload), &input); err != nil {
		return "", runtime.NewError("invalid JSON", 3)
	}

	if input.Ticket == "" {
		return "", runtime.NewError("missing ticket", 3)
	}

	logger.Info("✅ Matchmaking ticket removed: %s", input.Ticket)
	return "{}", nil
}