/**
 * =========================================
 * TDV_SDK – SENTENCE SEQUENCE (G120)
 * Compatible with Construct 2
 * =========================================
 */

var tdv_sdk = {

    /* ================= CORE ================= */
    mode: "preview",
    game_code: "G120",

    gameData: [],
    currentQuestionIndex: 0,
    currentQuestion: null,

    /* ================= QUESTION ================= */
    correctSentence: "",
    correctWords: [],
    currentWords: [],
    blankCount: 1,

    /* ================= SLOT ================= */
    placedWords: [],
    blankIndexes: [],
    missingWords: [],
    canSubmit: 0,

    /* ================= INIT ================= */
    init: function (config) {
        console.log("✅ tdv_sdk.init called", config);

        window.answerResult = -1;
        window.gameState = 0;

        // Data được push từ SDK Bridge
        if (window.SDK_GAME_DATA) {
            this.gameData = window.SDK_GAME_DATA;
        }

        this.loadQuestions();
    },

    /* ================= LOAD QUESTION ================= */
    loadQuestions: function () {
        var q = this.gameData[this.currentQuestionIndex];
        if (!q) {
            console.warn("No question data");
            return;
        }

        this.currentQuestion = q;

        // Chuẩn G120
        this.correctSentence = q.sentence || "";
        this.correctWords = this.correctSentence.split(/\s+/);
        this.blankCount = q.blank_count || 1;

        this.currentWords = [...this.correctWords];

        this.resetPlacedWords();
        this.generateBlankIndexes();
        this.generateMissingWords();

        console.log("📝 Loaded sentence:", this.correctSentence);
    },

    /* ================= SLOT LOGIC ================= */
    resetPlacedWords: function () {
        this.placedWords = new Array(this.correctWords.length).fill("");
        this.canSubmit = 0;
    },

    setWordAtSlot: function (word, index) {
        this.placedWords[index] = word;
        this.updateSubmitState();
    },

    updateSubmitState: function () {
        var filled = this.blankIndexes.filter(i => this.placedWords[i]).length;
        this.canSubmit = (filled === this.blankIndexes.length) ? 1 : 0;
    },

    /* ================= BLANK ================= */
    generateBlankIndexes: function () {
        var pool = [...Array(this.correctWords.length).keys()];
        pool.sort(() => Math.random() - 0.5);
        this.blankIndexes = pool.slice(0, this.blankCount);
    },

    generateMissingWords: function () {
        this.missingWords = this.blankIndexes.map(i => this.correctWords[i]);
    },

    /* ================= BUILD ================= */
    buildUserSentence: function () {
        var result = [];
        for (var i = 0; i < this.correctWords.length; i++) {
            if (this.blankIndexes.includes(i)) {
                result.push(this.placedWords[i] || "");
            } else {
                result.push(this.correctWords[i]);
            }
        }
        return result.join(" ").replace(/\s+/g, " ").trim();
    },

    /* ================= SUBMIT ================= */
    submitAnswer: function () {
        if (this.canSubmit !== 1) return -1;

        var userSentence = this.buildUserSentence();
        console.log("📤 SUBMIT:", userSentence);

        window.answerResult = (userSentence === this.correctSentence) ? 1 : 0;
        window.gameState = 2;

        return window.answerResult;
    },

    /* ================= API FOR CONSTRUCT 2 ================= */
    getInstructions: function () {
        return "Drag the missing words to complete the sentence.";
    },

    getWordsCount: function () {
        return this.correctWords.length;
    },

    getBlankCount: function () {
        return this.blankIndexes.length;
    },

    canSubmitAnswer: function () {
        return this.canSubmit;
    },

    getCurrentScore: function () {
        return window.answerResult === 1 ? 1 : 0;
    },

    getRemainingTime: function () {
        return 0;
    },

    getCorrectResultText: function () {
        return this.correctSentence;
    },

    forceFinishGame: function () {
        window.gameState = 2;
    },

    leaderboard: function () {
        return "";
    }
};