// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (C) 2023 Ralf Bauer and others
 */

#include "WebApi_database.h"
#include "MessageOutput.h"
#include "WebApi.h"
#include "defaults.h"
#include <AsyncJson.h>
#include <LittleFS.h>

void WebApiDatabaseClass::init(AsyncWebServer* server)
{
    using std::placeholders::_1;

    _server = server;
    _server->on("/api/database", HTTP_GET, std::bind(&WebApiDatabaseClass::onDatabase, this, _1));
}

void WebApiDatabaseClass::loop()
{
}

bool WebApiDatabaseClass::write(float energy)
{
    static uint8_t old_hour = 255;
    static float old_energy = 0.0;

    // LittleFS.remove(DATABASE_FILENAME);

    struct tm timeinfo;
    if (!getLocalTime(&timeinfo, 5)) // get cuurent time
        return (false);
    if (timeinfo.tm_hour == old_hour) // must be new hour
        return (false);
    if (old_hour == 255) { // don't write to database after reboot
        old_hour = timeinfo.tm_hour;
        return (false);
    }
    if (energy <= old_energy) // enery must have increased
        return (false);

    struct Data d;
    d.tm_hour = old_hour;
    old_hour = timeinfo.tm_hour;
    d.tm_year = timeinfo.tm_year - 100; // year counting from 2000
    d.tm_mon = timeinfo.tm_mon + 1;
    d.tm_mday = timeinfo.tm_mday;
    d.energy = old_energy = energy;

    File f = LittleFS.open(DATABASE_FILENAME, "a");
    if (!f) {
        return (false);
    }
    f.write((const uint8_t*)&d, sizeof(Data));
    f.close();
    return (true);
}

void WebApiDatabaseClass::onDatabase(AsyncWebServerRequest* request)
{
    if (!WebApi.checkCredentialsReadonly(request)) {
        return;
    }

    try {
        File f = LittleFS.open(DATABASE_FILENAME, "r", false);
        if (!f) {
            return;
        }

        struct Data d;

        AsyncJsonResponse* response = new AsyncJsonResponse(true, 40000U);
        JsonArray root = response->getRoot();

        while (f.read((uint8_t*)&d, sizeof(Data))) { // read from database
            JsonArray nested = root.createNestedArray(); // create new nested array and copy data to array
            nested.add(d.tm_year);
            nested.add(d.tm_mon);
            nested.add(d.tm_mday);
            nested.add(d.tm_hour);
            nested.add(d.energy);
        }
        f.close();
        response->setLength();
        request->send(response);
    } catch (std::bad_alloc& bad_alloc) {
        MessageOutput.printf("Call to /api/database temporarely out of resources. Reason: \"%s\".\r\n", bad_alloc.what());
        WebApi.sendTooManyRequests(request);
    }
}



/*  JS
const energy = JSON.parse('[[23,5,19,6,175.4089966],[23,5,19,10,175.7649994],[23,5,19,10,175.8939972],[23,5,19,10,175.904007],[23,5,19,10,175.9149933],[23,5,19,11,175.9669952],[23,5,19,11,175.973999],[23,5,19,12,176.1159973],[23,5,19,13,176.2900085],[23,5,19,14,176.4179993],[23,5,19,15,176.5429993],[23,5,19,16,176.6100006],[23,5,19,17,176.7269897],[23,5,19,18,176.8370056],[23,5,19,19,176.9060059],[23,5,19,20,176.9360046],[23,5,19,21,176.9459991],[23,5,20,5,176.9459991],[23,5,20,6,176.9470062],[23,5,20,7,176.9629974],[23,5,20,8,177.0270081],[23,5,20,9,177.0899963],[23,5,20,10,177.2389984],[23,5,20,11,177.4759979],[23,5,20,12,177.7310028],[23,5,20,13,178.0749817],[23,5,20,14,178.3970032],[23,5,20,15,178.7460022],[23,5,20,16,179.0829926],[23,5,20,17,179.3110046],[23,5,20,18,179.4849854],[23,5,20,19,179.5549927],[23,5,20,20,179.5899963]]')

var end = new Date()
var start = new Date()
var interval = 1
start.setDate(end.getDate() - interval)
start.setHours(start.getHours() - 1)
console.log(start.toLocaleString())
console.log(end.toLocaleString())

google.charts.load('current', {
  packages: ['corechart', 'bar']
});
google.charts.setOnLoadCallback(drawBasic);

function drawBasic() {
  var data = new google.visualization.DataTable();
  data.addColumn('datetime', 'Time');
  data.addColumn('number', 'Energy');
  var old_energy = energy[0][4]
  energy.forEach((x) => {
    var d = new Date(x[0] + 2000, x[1] - 1, x[2], x[3])
    if ((d >= start) && (d <= end)) {
      data.addRow([d, (x[4] - old_energy) * 1000])
    }
    old_energy = x[4]
  })

  var date_formatter = new google.visualization.DateFormat({
    pattern: "dd.MM.YY HH:mm"
  });
  date_formatter.format(data, 0);

  var options = {
    height: 500,
    legend: {
      position: 'none'
    },
    hAxis: {
      format: 'dd.MM.YY HH:mm',
      slantedText: true
    },
    vAxis: {
      format: '# Wh'
    }
  }

  var chart = new google.visualization.ColumnChart(document.getElementById('chart_div'));
  chart.draw(data, options);
}
*/

/* HTML
  <script type="text/javascript" src="https://www.gstatic.com/charts/loader.js"></script>
  <div id="chart_div"></div>
*/