document.addEventListener("DOMContentLoaded", function () {
    const logoLink = document.getElementById("logo-link");
    if (logoLink) {
        logoLink.addEventListener("click", function () {
            const logo = document.getElementById("logo");
            logo.style.transform = "scale(1.5)";
            setTimeout(() => {
                logo.style.transform = "scale(1)";
            }, 500);
        });
    }

    function startProgress() {
        const progressBar = document.getElementById("progress-bar");
        const progressContainer = document.getElementById("progress-container");
        const analyzeBtn = document.querySelector("button[type='submit']");

        if (progressBar && progressContainer && analyzeBtn) {
            progressContainer.style.display = "block";
            analyzeBtn.disabled = true;
            analyzeBtn.textContent = "⏳ Analysis in progress...";

            let width = 0;
            const totalTime = 180000;  // 3 minutes
            const intervalTime = totalTime / 100;

            const interval = setInterval(() => {
                if (width >= 100) {
                    clearInterval(interval);
                    progressBar.textContent = "100%";
                    setTimeout(() => {
                        progressContainer.style.display = "none";
                        progressBar.style.width = "0%";
                        progressBar.textContent = "0%";
                        analyzeBtn.disabled = false;
                        analyzeBtn.textContent = "Analyze";
                    }, 1000);
                } else {
                    width += 1;
                    progressBar.style.width = width + "%";
                    progressBar.textContent = width + "%";
                }
            }, intervalTime);

            // fallback di sicurezza
            setTimeout(() => {
                analyzeBtn.disabled = false;
                analyzeBtn.textContent = "Analyze";
                progressContainer.style.display = "none";
                progressBar.style.width = "0%";
                progressBar.textContent = "0%";
            }, totalTime + 3000);
        }
    }

    window.startProgress = startProgress;

    const analysisForm = document.getElementById("analysisForm");
    if (analysisForm) {
        analysisForm.addEventListener("submit", function () {
            startProgress();
        });
    }

    const analysisType = document.getElementById("analysis_type");
    if (analysisType) {
        analysisType.addEventListener("change", function () {
            document.getElementById("pubmed-options").style.display =
                this.value === "pubmed" ? "block" : "none";
            document.getElementById("local-options").style.display =
                this.value === "local" ? "block" : "none";
        });
        analysisType.dispatchEvent(new Event("change"));
    }

    const fileInput = document.getElementById("pdf_file");
    if (fileInput) {
        fileInput.addEventListener("change", function () {
            const fileLabel = document.querySelector('label[for="pdf_file"]');
            if (fileInput.files.length > 0 && fileLabel) {
                fileLabel.textContent = `Main PDF selected: ${fileInput.files[0].name}`;
            }
        });
    }

    const comparisonInput = document.getElementById("comparison_files");
    if (comparisonInput) {
        comparisonInput.addEventListener("change", function () {
            const label = document.querySelector('label[for="comparison_files"]');
            if (comparisonInput.files.length > 0 && label) {
                label.textContent = `${comparisonInput.files.length} comparison files selected`;
            }
        });
    }

    const flashMessages = document.querySelectorAll(".error");
    if (flashMessages.length > 0) {
        setTimeout(() => {
            flashMessages.forEach(message => message.remove());
        }, 5000);
    }
});