/**
 * List of voice types available
 * @type {string[]}
 */
let voiceTypes = [];
/**
 * List of categories available
 * @type {string[]}
 */
let categories = [];
/**
 * List of languages available
 * @type {string[]}
 */
let languages = [];

/**
 * List of scheduled days available
 * @type {string[]}
 */
let scheduledays = []

/**
 * Create a list item element
 * @param {String} text Text Content for the list item 
 * @param {String} className Specific class name for the list item
 * @returns {JQuery<HTMLElement>}
 */
function ListItem(text, className = "") {
    return $('<li>').addClass(className).text(text);
}

/**
 * WebSocket connection
 * @type {WebSocket}
 */
let ws = null;

/**
 * Send a command to the WebSocket server.
 * @param {String} command command to send
 * @param {String} data data to send
 */
function sendCommand(command, data) {
    if (ws.readyState === WebSocket.OPEN) {
        ws.send(JSON.stringify({ command, data }));
    }
}

/**
 * Fetch API helper function
 * @param {string} endpoint Endpoint URL
 * @param {string} method Method (GET, POST, etc.)
 * @param {Object} headers Headers to include in the request
 * @param {Object} body Body of the request
 * @param {Function} cbOK Callback function for successful response
 * @param {Function} cbError Callback function for error response
 */
function fetchAPI(endpoint, method, headers = {}, body = null, cbOK, cbError) {
    let url = window.location.origin + "/api/" + endpoint;
    let options = {
        method: method,
        headers: headers
    }
    if (body !== null) {
        options.body = JSON.stringify(body);
        if (!options.headers['Content-Type']) {
            options.headers['Content-Type'] = 'application/json';
        }
    }
    fetch(url, options)
        .then(response => {
            if (!response.ok) {
                throw new Error('Network response was not ok ' + response.statusText);
            }
            return response.json();
        })
        .then(data => {
            cbOK(data);
        })
        .catch(error => {
            cbError(error);
        });
}

/**
 * Fetch asset file from /assets/img/*
 * @param {String} url the filename to fetch, relative to /assets/img/
 * @param {Function} cbOK callback function on success, will receive the object URL
 * @param {Function} cbError callback function on error, will receive the error object
 */
function fetchImg(url, cbOK, cbError) {
    url = "/assets/img/" + url;
    fetch(url)
        .then(response => {
            if (!response.ok) {
                throw new Error('Network response was not ok ' + response.statusText);
            }
            return response.blob();
        })
        .then(blob => {
            const url = URL.createObjectURL(blob);
            cbOK(url);
        })
        .catch(error => {
            cbError(error);
        });
}

/**
 * Reload voice types from server
 */
function getVoiceTypes() {
    voiceTypes = [];
    fetchAPI("VoiceType", "GET", {}, null, (okdata) => {
        // okdata is a string contains elements separated by semicolon ;
        if (Array.isArray(okdata)) {
            voiceTypes = okdata.filter(item => item.trim().length > 0);
            //console.log("Loaded " + voiceTypes.length + " voice types : " + voiceTypes.join(", "));
        } else console.log("getVoiceTypes: okdata is not array");
    }, (errdata) => {
        alert("Error loading voice types : " + errdata.message);
    });
}

/**
 * Reload categories from server
 */
function getCategories() {
    categories = [];
    fetchAPI("Category", "GET", {}, null, (okdata) => {
        // okdata is a string contains elements separated by semicolon ;
        if (Array.isArray(okdata)) {
            categories = okdata.filter(item => item.trim().length > 0);
            //console.log("Loaded " + categories.length + " categories : " + categories.join(", "));
        } else console.log("getCategories: okdata is not array");
    }, (errdata) => {
        alert("Error loading categories : " + errdata.message);
    });
}

/**
 * Reload languages from server
 */
function getLanguages() {
    languages = [];
    fetchAPI("Language", "GET", {}, null, (okdata) => {
        // okdata is a string contains elements separated by semicolon ;
        if (Array.isArray(okdata)) {
            languages = okdata.filter(item => item.trim().length > 0);
            //console.log("Loaded " + languages.length + " languages : " + languages.join(", ") );
        } else console.log("getLanguages: okdata is not array");
    }, (errdata) => {
        alert("Error loading languages : " + errdata.message);
    });
}

/**
 * Reload scheduled days from server
 */
function getScheduledDays() {
    scheduledays = [];
    fetchAPI("ScheduleDay", "GET", {}, null, (okdata) => {
        // okdata is a string contains elements separated by semicolon ;
        if (Array.isArray(okdata)) {
            scheduledays = okdata.filter(item => item.trim().length > 0);
            //console.log("Loaded " + scheduledays.length + " scheduled days : " + scheduledays.join(", ") );
        } else console.log("getScheduledDays: okdata is not array");
    }, (errdata) => {
        alert("Error loading scheduled days : " + errdata.message);
    });
}

/**
 * Clear database mechanism
 * @param {String} APIURL API URL endpoint 
 * @param {String} whattoclear what to clear
 * @param {Function} cbOK callback function on success
 * @param {Function} cbError callback function on error
 */
function DoClear(APIURL, whattoclear, cbOK, cbError) {
    if (confirm(`Are you sure want to clear ${whattoclear} ? This procedure is not reversible`)) {
        fetchAPI(APIURL + "List", "DELETE", {}, null, (okdata) => {
            cbOK(okdata);
        }, (errdata) => {
            cbError(errdata);
        });
    }
}


/**
 * Export mechanism to XLSX file
 * @param {String} APIURL API URL endpoint
 * @param {String} filename target filename
 * @param {Object} queryParams additional query parameters as object
 */
function DoExport(APIURL, filename, queryParams = {}) {
    // send GET request to APIURL + "ExportXLSX"
    // reply Content-Type is application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
    // reply Content-Disposition: attachment; filename=filename
    // Use fetch to download the XLSX file as a blob and trigger download
    let url = "/api/" + APIURL + "ExportXLSX";
    if (queryParams && Object.keys(queryParams).length > 0) {
        url += "?" + new URLSearchParams(queryParams).toString();
    }

    fetch(url, {
        method: "GET",
        headers: {}
    })
        .then(response => {
            if (!response.ok) throw new Error('Network response was not ok ' + response.statusText);
            return response.blob();
        })
        .then(blob => {
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            a.remove();
            window.URL.revokeObjectURL(url);
        })
        .catch(error => {
            alert("Error export to " + filename + ": " + error.message);
        });
    return; // prevent the rest of the function from running

}

/**
 * Import mechanism from XLSX file
 * @param {String} APIURL API URL endpoint
 * @param {Function<Object>} cbOK function that accept object data
 * @param {Function<Error>} cbError function that accept error object
 */
function DoImport(APIURL, cbOK, cbError) {
    // Open file selection dialog that accepts only .xlsx files
    // then upload to server using fetchAPI at "api/ImportXLSX" with POST method
    let fileInput = document.createElement('input');
    fileInput.type = 'file';
    fileInput.accept = '.xlsx';
    fileInput.onchange = e => {
        let file = e.target.files[0];
        if (file) {
            let formData = new FormData();
            formData.append('file', file);
            fetch("/api/" + APIURL + "ImportXLSX", { method: 'POST', body: formData })
                .then(response => {
                    if (!response.ok) { throw new Error('Network response was not ok ' + response.statusText); }
                    return response.json();
                })
                .then(data => {
                    cbOK(data);
                })
                .catch(error => {
                    cbError(error);
                });
        } else {
            cbError(new Error("No file selected"));
        }
    };
    fileInput.click();
    fileInput.remove();
}

let $onlineindicator = null;
let $cpustatus = null;
let $ramstatus = null;
let $diskstatus = null;
let $networkstatus = null;
let $datetimetext = null;

let greencircle = null;
let redcircle = null;
/**
 * App entry point
 */
$(document).ready(function () {
    document.title = "Automatic Announcement System"
    fetchImg('green_circle.png', (url) => { greencircle = url; }, (err) => { console.error("Error loading green_circle.png : ", err); });
    fetchImg('red_circle.png', (url) => { redcircle = url; }, (err) => { console.error("Error loading red_circle.png : ", err); });
    const wsURL = window.location.pathname + '/ws'
    if (chrome && chrome.runtime && chrome.runtime.lastError) {
        alert("Runtime error: " + chrome.runtime.lastError.message);
        return;
    }
    $onlineindicator = $('#onlineindicator');
    $cpustatus = $('#cpustatus');
    $ramstatus = $('#ramstatus');
    $diskstatus = $('#diskstatus');
    $networkstatus = $('#networkstatus');
    $datetimetext = $('#datetimetext');
    

    // reset status indicators
    function resetStatusIndicators() {
        $onlineindicator.attr('src', redcircle);
        $cpustatus.text("CPU : N/A");
        $ramstatus.text("RAM : N/A");
        $diskstatus.text("Disk : N/A");
        $networkstatus.text("Network : N/A");
        $datetimetext.text("Date/Time : N/A");
    }


    resetStatusIndicators();
    getVoiceTypes();
    getCategories();
    getLanguages();
    getScheduledDays();
    

     // Initialize WebSocket connection
        ws = new WebSocket(wsURL);

    ws.onopen = () => {
        console.log('WebSocket connection established');
        $onlineindicator.attr('src', greencircle);
    };
    ws.onmessage = (event) => {
        let rep = JSON.parse(event.data);
        let cmd = rep.reply
        let data = rep.data;
        if (cmd && cmd.length > 0) {
            switch (cmd) {
                case "getCPUStatus":
                    $cpustatus.text("CPU : " + data)
                    break;
                case "getMemoryStatus":
                    $ramstatus.text("RAM : " + data)
                    break;
                case "getDiskStatus":
                    $diskstatus.text("Disk : " + data)
                    break;
                case "getNetworkStatus":
                    $networkstatus.text("Network : " + data)
                    break;
                case "getSystemTime":
                    $datetimetext.text(data)
                    break;

            }
        }
    };
    ws.onclose = () => {
        console.log('WebSocket connection closed');
        resetStatusIndicators();

    };

    // ws.onerror = (error) => {
    //     console.error('WebSocket error:', error);
    // };



    setInterval(() => {
        sendCommand("getCPUStatus", "")
        sendCommand("getMemoryStatus", "")
        sendCommand("getDiskStatus", "")
        sendCommand("getNetworkStatus", "")
        sendCommand("getSystemTime", "")
    }, 1000)

    let sidemenu = new bootstrap.Offcanvas('#offcanvas-menu');
    $('#showmenu').click(() => { sidemenu.show(); })

    $('#homelink').click(() => {
        sidemenu.hide();
        $('#content').load('overview.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Overview content loaded successfully");
            }
        });
    });
    $('#soundbanklink').click(() => {
        sidemenu.hide();
        $('#content').load('soundbank.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Soundbank content loaded successfully");
                // pindah soundbank.js
                
            } else {
                console.error("Error loading soundbank content : ", xhr.status, xhr.statusText);
            }
        });

    })
    $('#messagebanklink').click(() => {
        sidemenu.hide();
        $('#content').load('messagebank.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Messagebank content loaded successfully");
                // pindah messagebank.js
                
            } else {
                console.error("Error loading messagebank content : ", xhr.status, xhr.statusText);
            }
        });

    })
    $('#languagelink').click(() => {
        sidemenu.hide();
        $('#content').load('language.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Language content loaded successfully");
                // pindah languagelink.js
                
            } else {
                console.error("Error loading language content : ", xhr.status, xhr.statusText);
            }
        });
    })
    $('#broadcastzonelink').click(() => {
        sidemenu.hide();
        $('#content').load('broadcastzones.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Broadcast Zone content loaded successfully");
                // pindah ke broadcastzones.js

            } else {
                console.error("Error loading broadcast zone content : ", xhr.status, xhr.statusText);
            }
        });
    })
    $('#timerlink').click(() => {
        sidemenu.hide();
        $('#content').load('timer.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Timer content loaded successfully");
                // pindah ke schedulebank.js
                
            } else {
                console.error("Error loading timer content : ", xhr.status, xhr.statusText);
            }
        });
    })
    $('#loglink').click(() => {
        sidemenu.hide();
        $('#content').load('log.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Log content loaded successfully");
                // pindah ke log.js

            } else {
                console.error("Error loading log content:", xhr.status, xhr.statusText);
            }
        });
    })
    $('#settinglink').click(() => {
        sidemenu.hide();
        $('#content').load('setting.html', function (response, status, xhr) {
            if (status === "success") {
                console.log("Setting content loaded successfully");
                //sendCommand("getSetting", "");
            } else {
                console.error("Error loading setting content:", xhr.status, xhr.statusText);
            }
        });
    })
    $('#logoutlink').click(() => {
        window.location.href = "login.html"
    })

});