using System;
using System.Globalization;
using System.Net.Http;
using System.Text.Json;

// Print numbers with a dot, whatever the language of the machine
CultureInfo.CurrentCulture = CultureInfo.InvariantCulture;

// Read both funds' files (one GET each, no key), naming your own project
using var http = new HttpClient();
http.DefaultRequestHeaders.UserAgent.ParseAdd(
    "MyProject/1.0 (+https://example.com)");
const string api = "https://tickerinside.com/api/v1/fund/";
using var vooDoc = JsonDocument.Parse(
    await http.GetStringAsync(api + "voo.json"));
using var qqqDoc = JsonDocument.Parse(
    await http.GetStringAsync(api + "qqq.json"));
var voo = vooDoc.RootElement;
var qqq = qqqDoc.RootElement;

// Each fund has the date of its own issuer's file
Console.WriteLine(
    $"VOO holdings_as_of {voo.GetProperty("holdings_as_of").GetString()}");
Console.WriteLine(
    $"QQQ holdings_as_of {qqq.GetProperty("holdings_as_of").GetString()}");

// Overlap by weight, as the site computes it: for every ticker both funds
// hold, add the smaller of its two weights
var inQqq = qqq.GetProperty("holdings");
double overlap = 0;
int shared = 0;
foreach (var h in voo.GetProperty("holdings").EnumerateObject())
{
    if (inQqq.TryGetProperty(h.Name, out var w))
    {
        overlap += Math.Min(h.Value.GetDouble(), w.GetDouble());
        shared++;
    }
}
Console.WriteLine(
    $"overlap by weight {overlap:F1}%, {shared} companies in both");

// The lines to print under the figure, one per fund file
Console.WriteLine(voo.GetProperty("cite_as").GetString());
Console.WriteLine(qqq.GetProperty("cite_as").GetString());