const steps = [
    { step: 1, title: "Periksa Data Belanja" },
    { step: 2, title: "Periksa Informasi Anda" },
    { step: 3, title: "Pilih Metode Pembayaran" },
    { step: 4, title: "Lakukan Pembayaran" },
];

function getStep() {
    const params = new URLSearchParams(window.location.search);
    let step = parseInt(params.get("step"));
    if (!step || step < 1 || step > 4) step = 1;
    return step;
}

function goToStep(step) {
    if (
        (localStorage.getItem("paymentMethod") || null) === null &&
        step === 4
    ) {
        alert("Pilih salah satu metode pembayaran!", false);
        return;
    }
    window.location.href = "payment.html?step=" + step;
}

function renderStepNav(currentStep) {
    let navHtml = `<div class="table-responsive">
    <table class="table table-bordered text-center">
      <thead class="table-light">
        <tr>`;
    steps.forEach((s) => {
        navHtml += `<th class="${
            s.step === currentStep ? "bg-info text-white" : "text-muted"
        }">
      <small>Langkah ${s.step}</small>
    </th>`;
    });
    navHtml += `</tr></thead></table></div>`;
    document.getElementById("step-nav").innerHTML = navHtml;
}

function renderStepButtons(currentStep) {
    let btnHtml = `<div class="d-flex justify-content-end">`;
    if (currentStep > 1) {
        btnHtml += `<button class="btn btn-secondary btn-lg me-2" onclick="goToStep(${
            currentStep - 1
        })">Kembali</button>`;
    }
    if (currentStep === 2) {
        btnHtml += `<button class="btn btn-primary btn-lg" onclick="saveInfoAndLanjut()">Lanjut</button>`;
    } else if (currentStep < 4) {
        btnHtml += `<button class="btn btn-primary btn-lg" onclick="goToStep(${
            currentStep + 1
        })">Lanjut</button>`;
    } else {
        btnHtml += `<button class="btn btn-success btn-lg" onclick="processFinalPayment()">Submit</button>`;
    }
    btnHtml += `</div>`;
    document.getElementById("step-buttons").innerHTML = btnHtml;
}

async function displayStep1Content() {
    document.getElementById("step-content").innerHTML = `
    <h2 class="mb-3">Langkah ${steps[0].step}: ${steps[0].title}</h2>
    <div id="cart-summary-step" class="table-responsive"></div>`;
    await loadCartSummary();
}

var products = [];

var totalPrice = 0;
async function calculateTotalPrice() {
    products = await fetchProductsData();

    try {
        const cart = await getCarts();
        let cartCount = {};
        cart.forEach((id) => {
            cartCount[id] = (cartCount[id] || 0) + 1;
        });
        totalPrice = 0;
        for (let id in cartCount) {
            const product = products.find((p) => p.id === parseInt(id));
            if (product) {
                totalPrice += product.price * cartCount[id];
            }
        }
    } catch (err) {
        console.error("Error loading cart summary:", err);
    }
    return totalPrice;
}

async function getTotalPrice() {
    totalPrice = await calculateTotalPrice();
    console.log("Total Harga:", totalPrice);

    return totalPrice;
}

async function loadCartSummary() {
    products = await fetchProductsData();
    totalPrice = await getTotalPrice();
    const cart = await getCarts();

    let cartCount = {};
    cart.forEach((id) => {
        cartCount[id] = (cartCount[id] || 0) + 1;
    });
    let tableHtml = `<div id="cart-summary-step-wrapper">
  <table class="table table-striped">
    <thead>
      <tr>
        <th>No</th>
        <th>Nama Produk</th>
        <th>Harga</th>
        <th>Quantity</th>
        <th>Subtotal</th>
      </tr>
    </thead>
    <tbody>`;
    let index = 1;
    if (Object.keys(cartCount).length === 0) {
        tableHtml += `<tr><td colspan="5">Keranjang kosong.</td></tr>`;
    } else {
        for (let id in cartCount) {
            const product = products.find((p) => p.id === parseInt(id));
            if (product) {
                const qty = cartCount[id];
                const subtotal = product.price * qty;
                tableHtml += `<tr>
          <td>${index++}</td>
          <td>${product.name}</td>
          <td>${formatRupiah(product.price)}</td>
          <td>${qty}</td>
          <td>${formatRupiah(subtotal)}</td>
        </tr>`;
            }
        }
        tableHtml += `<tr class="table-light">
      <td colspan="4" class="text-end"><strong>Total</strong></td>
      <td><strong>${formatRupiah(totalPrice)}</strong></td>
    </tr>`;
    }
    tableHtml += `</tbody></table>`;
    document.getElementById("cart-summary-step").innerHTML = tableHtml;
}

async function displayStep2Content() {
    const userData = await getUserData();

    document.getElementById("step-content").innerHTML = `
    <h2 class="mb-3">Langkah ${steps[1].step}: ${steps[1].title}</h2>
    <form id="info-form" class="fs-5">
      <div class="mb-3">
        <label class="form-label">Nama Lengkap</label>
        <input type="text" class="form-control form-control-lg" id="infoName" value="${userData.name}" required>
      </div>
      <div class="mb-3">
        <label class="form-label">Email</label>
        <input type="email" class="form-control form-control-lg" id="infoEmail" value="${userData.email}" required disabled>
      </div>
      <div class="mb-3">
        <label class="form-label">Telepon</label>
        <input type="text" class="form-control form-control-lg" id="infoPhone" value="${userData.phone}" required>
      </div>
      <div class="mb-3">
        <label class="form-label">Alamat</label>
        <input type="text" class="form-control form-control-lg" id="infoAddress" value="${userData.address}" required>
      </div>
    </form>`;
}

async function saveInfoAndLanjut() {
    const name = document.getElementById("infoName").value.trim();
    const email = document.getElementById("infoEmail").value.trim();
    const phone = document.getElementById("infoPhone").value.trim();
    const address = document.getElementById("infoAddress").value.trim();

    const userData = await getUserData();

    const transactions = userData.transactions ? userData.transactions : {};

    const updatedUser = {
        uid: userData.uid,
        name: name,
        email: userData.email,
        phone: phone,
        address: address,
        photo_profile: userData.photo_profile,
        cart: userData.cart,
        transactions: transactions,
    };

    if (!name || !email || !phone || !address) {
        alert("Semua input wajib diisi!", false);
        return;
    }

    localStorage.setItem("userData", JSON.stringify(updatedUser));
    await updateUserDataToGitHub(updatedUser);
    goToStep(3);
}

function displayStep3Content() {
    const params = new URLSearchParams(window.location.search);
    const message = params.get("message") || "";

    if (message.trim()) alert(message, false);

    document.getElementById("step-content").innerHTML = `
      <h2 class="mb-3">Langkah ${steps[2].step}: ${steps[2].title}</h2>
      <br>
      <br>
      <div class="text-center ${message ? "text-danger mb-4" : ""}">
        ${message}
      </div>
      <div id="payment-method-buttons" class="d-flex flex-wrap justify-content-center mb-3">
        <button class="btn btn-outline-primary btn-lg m-2" data-method="bank">
          <i class="bi bi-building me-1"></i> Bank Transfer
        </button>
        <button class="btn btn-outline-primary btn-lg m-2" data-method="qr">
          <i class="bi bi-qr-code me-1"></i> Scan QR
        </button>
        <button class="btn btn-outline-primary btn-lg m-2" data-method="card">
          <i class="bi bi-credit-card me-1"></i> Kartu Kredit/Debit
        </button>
      </div>
      <p class="text-center" id="infoChoose"></p>
  `;

    const infoChoose = document.getElementById("infoChoose");

    document
        .querySelectorAll("#payment-method-buttons button")
        .forEach((btn) => {
            btn.addEventListener("click", function () {
                const method = this.getAttribute("data-method");

                localStorage.setItem("paymentMethod", method);

                document
                    .querySelectorAll("#payment-method-buttons button")
                    .forEach((b) => {
                        b.classList.remove("active");
                    });

                this.classList.add("active");

                infoChoose.innerText =
                    "Anda memilih metode pembayaran: " + this.innerText;
            });
        });

    const savedMethod = localStorage.getItem("paymentMethod");
    infoChoose.innerText =
        "Sebelum lanjut pilih metode pembayaran yang tersedia diatas";

    if (savedMethod) {
        const btn = document.querySelector(
            `#payment-method-buttons button[data-method="${savedMethod}"]`
        );
        if (btn) {
            btn.classList.add("active");
            infoChoose.innerText =
                "Anda memilih metode pembayaran: " + btn.innerText;
        }
    }
}

async function loadBankList() {
    try {
        const url =
            "https://gist.githubusercontent.com/muhammadyana/6abf8480799637b4082359b509410018/raw/indonesia-bank.json";
        const response = await fetch(url);
        if (!response.ok) {
            throw new Error("Gagal memuat data bank: " + response.status);
        }
        const banks = await response.json();
        const bankSelect = document.getElementById("bankName");

        bankSelect.innerHTML = '<option value="">Pilih Bank</option>';
        banks.forEach((bank) => {
            const option = document.createElement("option");
            option.value = bank.code;
            option.text = bank.name;
            bankSelect.appendChild(option);
        });
    } catch (error) {
        console.error("Error loadBankList:", error);
    }
}

async function displayStep4Content() {
    await getTotalPrice();
    const method = localStorage.getItem("paymentMethod") || null;

    if (method === null) {
        window.location.href =
            "payment.html?step=3&message=Sebelum lanjut mohon pilih metode pembayaran terlebih dahulu!";
    }

    let html = `<h2 class="mb-3">Langkah ${steps[3].step}: ${steps[3].title}</h2>`;

    if (method === "qr") {
        html += `<p class="fs-5">Silakan scan QR Code berikut dengan aplikasi pembayaran Anda:</p>
             <div id="qr-code" class="my-3"></div>`;
        document.getElementById("step-content").innerHTML = html;
        generateQRCode();
    } else if (method === "bank") {
        html += `<form id="final-payment-form" class="fs-5">
      <div class="mb-3">
        <label class="form-label">Nama Bank</label>
        <select class="form-control form-control-lg" id="bankName" required>
          <option value="">Pilih Bank</option>
        </select>
      </div>
      <div class="mb-3">
        <label class="form-label">Nomor Rekening</label>
        <input type="text" class="form-control form-control-lg" id="accountNumber" required>
      </div>
    </form>`;
        document.getElementById("step-content").innerHTML = html;

        await loadBankList();
    } else {
        html += `<form id="final-payment-form" class="fs-5">
      <div class="mb-3">
        <label class="form-label">Nomor Kartu Kredit/Debit</label>
        <input type="text" class="form-control form-control-lg" id="cardNumber" required>
      </div>
      <div class="mb-3">
        <label class="form-label">Tanggal Kedaluwarsa (MM/YY)</label>
        <input type="text" class="form-control form-control-lg" id="expiry" placeholder="MM/YY" required>
      </div>
      <div class="mb-3">
        <label class="form-label">CVV</label>
        <input type="text" class="form-control form-control-lg" id="cvv" required>
      </div>
    </form>`;
        document.getElementById("step-content").innerHTML = html;
    }
}

async function processFinalPayment() {
    const method = localStorage.getItem("paymentMethod") || "card";
    let valid = true;

    if (method === "bank") {
        valid =
            document.getElementById("bankName").value.trim() &&
            document.getElementById("accountNumber").value.trim();
    } else if (method === "card") {
        valid =
            document.getElementById("cardNumber").value.trim() &&
            document.getElementById("expiry").value.trim() &&
            document.getElementById("cvv").value.trim();
    }

    if (!valid) {
        alert("Semua input wajib diisi!", false);
        return;
    }

    await alert(
        "Proses pembayaran...",
        true,
        true,
        7,
        [
            {
                timeOut: 3,
                message: "Pembayaran Berhasil!",
            },
        ],
        3
    );

    await clearCart(method);
}

async function clearCart(payment_method) {
    const userData = await getUserData();
    const transactions = userData.transactions ? userData.transactions : {};

    const updatedUser = {
        uid: userData.uid,
        name: userData.name,
        email: userData.email,
        phone: userData.phone,
        address: userData.address,
        photo_profile: userData.photo_profile,
        cart: [],
        transactions: transactions,
    };

    console.log("clearCart", updatedUser);

    await saveTransaction(updatedUser, userData.cart, payment_method);

    updateCartIcon();
}

async function saveTransaction(userData, productIDs, paymentMethod) {
    let now = new Date();
    let transactionID =
        now.getFullYear() +
        "_" +
        String(now.getMonth() + 1).padStart(2, "0") +
        "_" +
        String(now.getDate()).padStart(2, "0") +
        "_" +
        String(now.getHours()).padStart(2, "0") +
        "_" +
        String(now.getMinutes()).padStart(2, "0") +
        "_" +
        String(now.getSeconds()).padStart(2, "0") +
        "_" +
        String(now.getMilliseconds()).padStart(3, "0");

    const products = await fetchProductsData();

    const transactions = userData.transactions;

    let productMap = {};

    productIDs.forEach((id) => {
        if (products[id]) {
            if (productMap[id]) {
                productMap[id].total += 1;
            } else {
                productMap[id] = { ...products[id], total: 1 };
            }
        }
    });

    let theProducts = Object.values(productMap);

    transactions[transactionID] = {
        products: theProducts,
        payment_method: paymentMethod,
        user: {
            name: userData.name,
            email: userData.email,
            phone: userData.phone,
            address: userData.address,
            photo_profile: userData.photo_profile,
        },
    };

    userData.transactions = transactions;

    await updateUserDataToGitHub(userData);
    localStorage.setItem("userData", JSON.stringify(userData));

    console.log("saveTransaction", userData);

    console.log("Transaksi berhasil disimpan dengan ID:", transactionID);

    window.location.href = `transaction.html?date=${transactionID}`;
}

function computeCRC(input) {
    let crc = 0xffff;
    for (let i = 0; i < input.length; i++) {
        crc ^= input.charCodeAt(i) << 8;
        for (let j = 0; j < 8; j++) {
            if (crc & 0x8000) {
                crc = ((crc << 1) ^ 0x1021) & 0xffff;
            } else {
                crc = (crc << 1) & 0xffff;
            }
        }
    }
    return crc.toString(16).toUpperCase().padStart(4, "0");
}

function generateQRCode() {
    const qrContainer = document.getElementById("qr-code");
    if (!qrContainer) return;
    qrContainer.innerHTML = "";

    const payloadWithoutCRC = `00 02 01
01 0F ID.CO.QRIS000001
02 07 QRIS V2
03 02 12
04 03 360
05 06 ${totalPrice}
06 02 ID
07 0B BRI Virtual
08 07 Sidoarjo
63 04`;

    const payloadForCRC = payloadWithoutCRC + "0000";
    const crcValue = computeCRC(payloadForCRC);

    const finalPayload = payloadWithoutCRC + crcValue;

    new QRCode(qrContainer, {
        text: finalPayload,
        width: 200,
        height: 200,
    });
}

async function initPaymentSteps() {
    const step = getStep();
    const cart = await getCarts();

    if (cart.length === 0)
        window.location.href = `cart.html?message=${encodeURIComponent("Anda belum memesan produk apapun. Pergi ke halaman produk untuk berbelanja")}`;

    products = await fetchProductsData();
    switch (step) {
        case 1:
            await displayStep1Content();
            break;
        case 2:
            await displayStep2Content();
            break;
        case 3:
            displayStep3Content();
            break;
        case 4:
            await displayStep4Content();
            break;
        default:
            displayStep1Content();
    }
    renderStepNav(step);
    renderStepButtons(step);
}

document.addEventListener("DOMContentLoaded", function () {
    AOS.init();
    initPaymentSteps();
});