// Elements
const composeEditor = document.getElementById("composeEditor");
const composeFileSelection = document.getElementById("composeFileSelection");
const result = document.getElementById("result");
const saveButton = document.getElementById("save");
const saveAndRunButton = document.getElementById("saveAndRun");
const stopButton = document.getElementById("stop");

// Load initial settings
document.onload = initPage();

// Event Listeners
composeFileSelection.addEventListener("change", dockerComposeFileChanged);
saveButton.addEventListener("click", saveDockerCompose);
saveAndRunButton.addEventListener("click", saveAndRunDockerCompose);
stopButton.addEventListener("click", stopDockerCompose);

// Initialize the page
function initPage() {
    const editor = ace.edit(composeEditor)

    // Editor Options
    editor.setOptions({
        highlightSelectedWord: true,
        copyWithEmptySelection: true,
        navigateWithinSoftTabs: true,
        useSoftTabs: true,
        printMargin: false,
        fontSize: "20px",
        theme: "ace/theme/cloud_editor_dark",
    });
    editor.session.setMode("ace/mode/yaml");

    // TODO: Replace /home/spiri/services with some root level path
    // Search for all docker-compose.yaml files in the services directory and populate the dropdown with directory names
    const command = "/usr/bin/ls -d ~/services/*/docker-compose.yaml | sed 's/\\/docker-compose.yaml//'"
    cockpit.spawn(["bash", "-c", command])
        .then((data) => {
            pathPairs = data.split("\n").map((path) => [path, path.replace("/home/spiri/services/", "")]);
            addDropDown(composeFileSelection, pathPairs, pathPairs[0][0]);
            dockerComposeFileChanged()
        })
        .catch((error) => displayFail(error));
}

// Callback for when a new docker-compose file is selected
// Populate the editor with the contents of the selected file or clear the editor if no file is selected
function dockerComposeFileChanged() {
    if (composeFileSelection.value === "") {
        populateEditor("");
        return;
    }
    const composeLocation = composeFileSelection.value + "/docker-compose.yaml";
    cockpit.file(composeLocation)
        .read().then((content) => successReadFile(content))
        .catch(error => failureReadFile(error));
}

// Populate the editor with passed in data
function populateEditor(data) {
    const editor = ace.edit(composeEditor);
    editor.setValue(data, -1);
}

// Callback for when the file is successfully read
// Currently, it just populates the editor with the data
function successReadFile(data) {
    populateEditor(data);
}

// Callback for when the file read fails
// Currently, it just logs the error (obviously)
function failureReadFile(error) {
    console.error(error);
}

// Save the contents of the editor to the selected docker-compose file
function saveDockerCompose() {
    if (composeFileSelection.value === "") return;
    const composeLocation = composeFileSelection.value + "/docker-compose.yaml";
    const editor = ace.edit(composeEditor);
    const composeData = editor.getValue();

    // Read the file and replace the contents with the new data
    cockpit.file(composeLocation)
        .replace(composeData)
        .then(() => displaySuccess("Docker Compose file saved successfully."))
        .catch(error => displayFail(error));
}

function getSelectedText() {
    const selectedOption = composeFileSelection.selectedOptions[0].text;
    return selectedOption ? selectedOption.text : '';
}

// Save the contents of the editor to the selected docker-compose file and restart the services
function saveAndRunDockerCompose() {
    if (composeFileSelection.value === "") return;
    saveDockerCompose();
    const composeLocation = composeFileSelection.value + "/docker-compose.yaml";
    const commandBringDown = `docker compose -f ${composeLocation} down`;
    const commandBringUp = `docker compose -f ${composeLocation} up -d`;
    const selection = composeFileSelection.selectedOptions[0].text;

    // Bring down the services then bring them back up with the new configuration
    displaySuccess(`Bringing down '${selection}' services...`);
    cockpit.spawn(["bash", "-c", commandBringDown], { superuser: true, err: "message" })
        .then(() => {
            displaySuccess(`'${selection}' services brought down successfully.`);
            displaySuccess(`Applying changes to '${selection}' services and bringing them back up...`);
            cockpit.spawn(["bash", "-c", commandBringUp], { superuser: true, err: "message" })
                .then(() => displaySuccess("Done."))
                .catch(error => displayFail(error.message));
        })
        .catch(error => displayFail(error.message));
}

// Stop the services in the selected docker-compose file
function stopDockerCompose() {
    if (composeFileSelection.value === "") return;
    const composeLocation = composeFileSelection.value + "/docker-compose.yaml";
    const commandBringDown = `docker compose -f ${composeLocation} down`;
    const selection = composeFileSelection.selectedOptions[0].text;

    displaySuccess(`Bringing down '${selection}' services...`);
    cockpit.spawn(["bash", "-c", commandBringDown], { superuser: true, err: "message" })
        .then(() => displaySuccess(`'${selection}' services brought down successfully.`))
        .catch(error => displayFail(error.message));
}

// Add options to a dropdown box
function addDropDown(box, pairs, defaultValue) {
    try {
        for(let i = 0; i < pairs.length; i++){
            if (pairs[i].length == 0 || pairs[i][0] === "" || pairs[i][1] === "") continue;
            const option = document.createElement("option");
            option.value = pairs[i][0];
            option.text = pairs[i][1];
            box.add(option);
            if (defaultValue === option.value) {
                box.value = option.value;
            }
        }
    }
    catch(e) {
        displayFail(e)
    }
}

// Display Success result
function displaySuccess(msg) {
    msg = `<span style='color: green;'>${msg}</span>`;
    if (result.innerHTML === "")
        result.innerHTML = msg;
    else
        result.innerHTML += "<br>" + msg;

    setTimeout(() => result.innerHTML = "", 10000);
}

// Display failure message
function displayFail(error) {
    console.error(error);
    error = `<span style='color: red;'>Error : ${error}</span>`;

    if (result.innerHTML === "")
        result.innerHTML = error;
    else
        result.innerHTML += "<br>" + error;

    setTimeout(() => result.innerHTML = "", 10000);
}