var gui = require('gui');
const { getSummation, toStringDate, toDateByComponents, getAccounts } = require('./utils');

function waitForPrefsChartWindow() {
    var rh = 14;
    var sp = 4;
    var y = sp;
    let gadgets = [];

    gadgets.push({
        kind: "string",
        left: sp, 
        width: 80,
        top: sp, 
        height: rh,
        label: "from",
        value: "01-01-2026"
    });

    gadgets.push({
        kind: "string",
        left: sp, 
        width: 80,
        top: sp, 
        height: rh,
        label: "to",
        value: toStringDate(new Date())
    });

    let win = gui.createWindow({
            title: "Summary Chart Prefs",
            width: sp + 128 + sp,
            height: y + rh + sp + rh + sp,
            left: 30,
            top: 30,
            gadgets: gadgets
        });

     while (true) {
            var evt = gui.waitEvent(win);
            if (!evt) continue;
    
            if (evt.type === 'close') {
                gui.closeWindow(win);
                
            }
    }
}

/**
 * @typedef Account
 * @property {String} name;
 * @property {AccountEntry[]} entries;
 */

/**
 * @typedef AccountEntry
 * @property {Number} date
 * @property {String} subject;
 * @property {Number} amount;
 * @property {String?} targetAccount;
 */

/**
 * @typedef DataPoint
 * @property {Number} timestamp;
 * @property {Number} value;
 * @property {String} accountName;
 * @property {String} tooltip;
 */

/**
 * 
 * @param {*} gui 
 * @param {*} win 
 * @param {Account[]} data 
 * @param {*} rangeFrom 
 * @param {*} rangeTo 
 */
function renderChart(gui, win, data, /** @type {Date} */ rangeFrom, /** @type {Date} */ rangeTo) {
    var rh = 14;
    var sp = 4;
    var y = sp;
    
    const gfx = gui.gfx;
    
    let datapoints = [];
    for (let i = 0; i < data.entries.length;++i) {
        datapoints.push({
            x: data.entries[i].date,
            v: data.entries[i].amount
        });

    }

// Compute cumulative series and min/max (include 0 to ensure Y=0 is visible)
let cumulative = [];
let cur = 0;
cumulative.push({ x: datapoints[0].x, y: 0 }); // start at 0
let lowest = 0;
let highest = 0;

for (let i = 0; i < datapoints.length; ++i) {
    cur += datapoints[i].v;
    cumulative.push({ x: datapoints[i].x, y: cur });
    if (cur < lowest) lowest = cur;
    if (cur > highest) highest = cur;
}
if (0 < lowest) lowest = 0;
if (0 > highest) highest = 0;

    const totalW = Math.max(10, 400 - sp * 3);
    const totalH = Math.max(10, 180 - sp * 3);
    const left = sp;
    const top = sp;
    const right = left + totalW;
    const bottom = top + totalH;

    console.log(lowest, highest);

    // X and Y ranges
    const minX = cumulative[0].x;
    const maxX = cumulative[cumulative.length - 1].x;
    const xRange = (maxX === minX) ? 1 : (maxX - minX);
    let yRange = highest - lowest;
    if (yRange === 0) yRange = 1;

    // mapping functions
    const mapX = x => left + ((x - minX) / xRange) * totalW;
    const mapY = y => bottom - ((y - lowest) / yRange) * totalH; // invert Y

    // draw Y=0 axis
    const y0 = mapY(0);
    gfx.setColor(win, 1);
    gfx.drawLine(win, left, y0, right, y0);

    gfx.setColor(win, 4);
    // draw polyline
    let last = cumulative[0];
    for (let i = 1; i < cumulative.length; ++i) {
        let p = cumulative[i];
        gfx.drawLine(win, mapX(last.x), mapY(last.y), mapX(p.x), mapY(p.y));
        last = p;
    }

}

function waitForChartWindow(data) {
    var rh = 14;
    var sp = 4;
    var y = sp;
    let gadgets = [];

    let rangeTo = new Date(toDateByComponents("31-12-2024"));
    let rangeFrom = new Date(toDateByComponents("01-01-" + rangeTo.getFullYear()));

    let win = gui.createWindow({
            title: "Summary Chart",
            width: sp + 400 + sp,
            height: y + 180 + sp,
            left: 30,
            top: 30,
            gadgets: gadgets,
        });

    renderChart(gui, win, data, rangeFrom, rangeTo);

     gui.setMenu(win, [
             {
                 title: 'Chart',
                 items: [
                     { label: 'Save', id: 401, key: 'S'},
                     { label: 'Close', id: 499, key: 'Q' }
                 ]
             },
             {
                 title: 'Prefs',
                 items: [
                     { label: "Set Daterange", id: 404, key: 'D' },
                 ]
             }
         ]);
        

     while (true) {
            var evt = gui.waitEvent(win);
            if (!evt) continue;
    
            if (evt.type === 'menu') {

            }

            if (evt.type === 'close') {
                gui.closeWindow(win);
                return null;
            }
    }
}

exports.waitForChartWindow = waitForChartWindow;