var elem_container = null;
var elem_text = null;

var segments = [];
var text_segments = [];
var captionLineCount = 3;
var allSegments = [];
var lastIncompleteSegment = null;

function formatTime(seconds) {
  const date = new Date(seconds * 1000);
  const hh = String(date.getUTCHours()).padStart(2, '0');
  const mm = String(date.getUTCMinutes()).padStart(2, '0');
  const ss = String(date.getUTCSeconds()).padStart(2, '0');
  const mmm = String(date.getUTCMilliseconds()).padStart(3, '0');
  return `${hh}:${mm}:${ss},${mmm}`;
}

function generateSRT() {
    return allSegments
    .map((seg, i) => {
    const start = formatTime(seg.start);
    const end   = formatTime(seg.end);
    const text  = seg.text.trim().replace(/[\r\n]+/g, ' ');
    return `${i + 1}\n${start} --> ${end}\n${text}`;
    })
    .join('\n\n');
}

function downloadSRT() {
    console.log("downloadSRT called");
    console.log("Total segments for SRT:", allSegments.length);
    const srtBlob = new Blob([generateSRT()], { type: 'text/srt;charset=utf-8' });
    const url = URL.createObjectURL(srtBlob);
    const a = document.createElement('a');
    a.href = url;
    a.download = 'captions.srt';
    a.style.display = 'none';
    document.body.appendChild(a);
    a.click();
    URL.revokeObjectURL(url);
    document.body.removeChild(a);
}

function initPopupElement() {
  if (document.getElementById('popupElement')) {
    return;
  }

  const popupContainer = document.createElement('div');
  popupContainer.id = 'popupElement';
  popupContainer.style.cssText = 'position: fixed; top: 50%; left: 50%; transform: translate(-50%, -50%); background: white; color: black; padding: 16px; border-radius: 10px; box-shadow: 0px 0px 10px rgba(0, 0, 0, 0.5); display: none; text-align: center;';

  const popupText = document.createElement('span');
  popupText.textContent = 'Default Text';
  popupText.className = 'popupText';
  popupText.style.fontSize = '24px';
  popupContainer.appendChild(popupText);

  const buttonContainer = document.createElement('div');
  buttonContainer.style.marginTop = '8px';
  const closePopupButton = document.createElement('button');
  closePopupButton.textContent = 'Close';
  closePopupButton.style.backgroundColor = '#65428A';
  closePopupButton.style.color = 'white';
  closePopupButton.style.border = 'none';
  closePopupButton.style.padding = '8px 16px'; // Add padding for better click area
  closePopupButton.style.cursor = 'pointer';
  closePopupButton.addEventListener('click', async () => {
    popupContainer.style.display = 'none';
    await chrome.runtime.sendMessage({ action: 'toggleCaptureButtons', data: false });
  });
  buttonContainer.appendChild(closePopupButton);
  popupContainer.appendChild(buttonContainer);

  document.body.appendChild(popupContainer);
}


function showPopup(customText) {
  const popup = document.getElementById('popupElement');
  const popupText = popup.querySelector('.popupText');

  if (popup && popupText) {
      popupText.textContent = customText || 'Default Text'; // Set default text if custom text is not provided
      popup.style.display = 'block';
  }
}


function init_element(lines = 3) {
    captionLineCount = Math.min(Math.max(parseInt(lines, 10) || 3, 1), 8);
    if (document.getElementById('transcription')) {
        return;
    }

    elem_container = document.createElement('div');
    elem_container.id = "transcription";
    elem_container.style.cssText = 'padding:0 24px;font-family:Arial,Helvetica,sans-serif;font-size:22px;font-weight:600;line-height:30px;position:fixed;top:85%;left:50%;transform:translate(-50%,-50%);width:min(80vw,900px);min-height:' + (captionLineCount * 30) + 'px;z-index:2147483647;color:white;text-align:center;letter-spacing:0.01em;text-shadow:0 0 2px #000,0 2px 4px rgba(0,0,0,0.95);cursor:move;';

    for (var i = 0; i <= captionLineCount; i++) {
        elem_text = document.createElement('span');
        elem_text.style.cssText = 'position:absolute;left:50%;transform:translateX(-50%);max-width:100%;padding:2px 14px;background:rgba(0,0,0,0.72);border-radius:6px;box-decoration-break:clone;-webkit-box-decoration-break:clone;';
        elem_text.id = "t" + i;
        elem_container.appendChild(elem_text);

        if (i == captionLineCount) {
            elem_text.style.top = "-1000px"
        }
    }

    document.body.appendChild(elem_container);

    let x = 0;
    let y = 0;

    // Query the element
    const ele = elem_container;

    // Handle the mousedown event
    // that's triggered when user drags the element
    const mouseDownHandler = function (e) {
        // Get the current mouse position
        x = e.clientX;
        y = e.clientY;

        // Attach the listeners to `document`
        document.addEventListener('mousemove', mouseMoveHandler);
        document.addEventListener('mouseup', mouseUpHandler);
    };

    const mouseMoveHandler = function (e) {
        // How far the mouse has been moved
        const dx = e.clientX - x;
        const dy = e.clientY - y;

        // Set the position of element
        ele.style.top = `${ele.offsetTop + dy}px`;
        ele.style.left = `${ele.offsetLeft + dx}px`;

        // Reassign the position of mouse
        x = e.clientX;
        y = e.clientY;
    };

    const mouseUpHandler = function () {
        // Remove the handlers of `mousemove` and `mouseup`
        document.removeEventListener('mousemove', mouseMoveHandler);
        document.removeEventListener('mouseup', mouseUpHandler);
    };

    ele.addEventListener('mousedown', mouseDownHandler);
}

function getStyle(el,styleProp)
{
    var x = document.getElementById(el);
    if (x.currentStyle)
        var y = x.currentStyle[styleProp];
    else if (window.getComputedStyle)
        var y = document.defaultView.getComputedStyle(x,null).getPropertyValue(styleProp);
    return y;
}

function get_lines(elem, line_height) {
    var divHeight = elem.offsetHeight;
    var lines = divHeight / line_height;

    var original_text = elem.textContent;

    var words = original_text.split(' ');
    var segments = [];
    var current_lines = 1;
    var segment = '';
    var segment_len = 0;
    for (var i = 0; i < words.length; i++)
    {
        segment += words[i] + ' ';
        elem.textContent = segment;
        divHeight = elem.offsetHeight;

        if ((divHeight / line_height) > current_lines) {
            var line_segment = segment.substring(segment_len, segment.length - 1 - words[i].length - 1);
            segments.push(line_segment);
            segment_len += line_segment.length + 1;
            current_lines++;
        }
    }

    var line_segment = segment.substring(segment_len, segment.length - 1)
    segments.push(line_segment);

    elem.textContent = original_text;

    return segments;

}

function remove_element() {
    var elem = document.getElementById('transcription')
    for (var i = 0; i <= captionLineCount; i++) {
        document.getElementById("t" + i).remove();
    }
    elem.remove()
}

chrome.runtime.onMessage.addListener((request, sender, sendResponse) => {
    const { type, data } = request;
    const saveCaptions = data.saveCaptions;
    const captionLines = data.captionLines || captionLineCount;

    if (type === "STOP") {        
        if (saveCaptions === true) {
            // If there is a last incomplete segment, push it to allSegments
            if (lastIncompleteSegment && lastIncompleteSegment.text && lastIncompleteSegment.text.trim() !== "") {
                // Apply same Python logic: check if transcript is empty OR start >= last end
                if (allSegments.length === 0 || parseFloat(lastIncompleteSegment.start) >= parseFloat(allSegments[allSegments.length - 1].end)) {
                    allSegments.push({
                        start: lastIncompleteSegment.start,
                        end: lastIncompleteSegment.end,
                        text: lastIncompleteSegment.text
                    });
                    console.log("Added final incomplete segment");
                }
            }
        
            downloadSRT();
        }
        remove_element();
        sendResponse({data: "STOPPED"});
        return true;
    } else if (type === "showWaitPopup"){
        initPopupElement();

        showPopup(`Estimated wait time ~ ${Math.round(data)} minutes`);
        sendResponse({data: "popup"});
        return true;
    }

    init_element(captionLines);

    try {
        const message = JSON.parse(data.data);
        const segments = message["segments"];
        
        if (saveCaptions === true) {
            segments.forEach(seg => {
                if (seg.completed === true && 
                    (allSegments.length === 0 || parseFloat(seg.start) >= parseFloat(allSegments[allSegments.length - 1].end))) {
                    allSegments.push({
                        start: seg.start,
                        end: seg.end,
                        text: seg.text
                    });
                    
                    lastIncompleteSegment = null;
                } else if (seg.completed !== true) {
                    lastIncompleteSegment = seg;
                }
            });
        }
        var text = '';
        for (var i = 0; i < segments.length; i++) {
            text += segments[i].text + ' ';
        }
        text = text.replace(/(\r\n|\n|\r)/gm, "");
        
        var elem = document.getElementById('t' + captionLineCount);
        if (elem) {
            elem.textContent = text;

            var line_height_style = getStyle('t' + captionLineCount, 'line-height');
            var line_height = parseInt(line_height_style.substring(0, line_height_style.length - 2));
            var divHeight = elem.offsetHeight;
            var lines = divHeight / line_height;

            text_segments = [];
            text_segments = get_lines(elem, line_height);
            
            elem.textContent = '';

            if (text_segments.length > captionLineCount - 1) {
                for (var i = 0; i < captionLineCount; i++) {
                    document.getElementById('t' + i).textContent = text_segments[text_segments.length - captionLineCount + i];
                }
            } else {
                for (var i = 0; i < captionLineCount; i++) {
                    document.getElementById('t' + i).textContent = '';
                }
            }

            if (text_segments.length <= captionLineCount - 1) {
                for (var i = 0; i < text_segments.length; i++) {
                    document.getElementById('t' + i).textContent = text_segments[i];
                }
            } else {
                for (var i = 0; i < captionLineCount; i++) {
                    document.getElementById('t' + i).textContent = text_segments[text_segments.length - captionLineCount + i];
                }
            }

            for (var i = 1; i < captionLineCount; i++)
            {
                var parent_elem = document.getElementById('t' + (i - 1));
                var elem = document.getElementById('t' + i);
                if (parent_elem && elem) {
                    elem.style.top = parent_elem.offsetHeight + parent_elem.offsetTop + 'px';
                }
            }
        }
    } catch (error) {
        console.error("Error processing message:", error);
    }

    sendResponse({});
    return true;
});