#r "DocumentFormat.OpenXml.dll"
#r "WindowsBase.dll"

using System.Net;
using System.IO;
using DocumentFormat.OpenXml.Packaging;
using DocumentFormat.OpenXml.Spreadsheet;

public static HttpResponseMessage Run(HttpRequestMessage req, TraceWriter log)
{
    log.Info($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");

    WebClient client = new WebClient();

    byte[] buffer = client.DownloadData("http://amor-webapp-test.azurewebsites.net/Content/hello.xlsx");
    MemoryStream stream = new MemoryStream();
    stream.Write(buffer, 0, buffer.Length);
    stream.Position = 0;
    using (SpreadsheetDocument doc = SpreadsheetDocument.Open(stream, false))
    {
        WorkbookPart workbookPart = doc.WorkbookPart;
        SharedStringTablePart sstpart = workbookPart.GetPartsOfType<SharedStringTablePart>().First();
        SharedStringTable sst = sstpart.SharedStringTable;

        WorksheetPart worksheetPart = workbookPart.WorksheetParts.First();
        Worksheet sheet = worksheetPart.Worksheet;

        var cells = sheet.Descendants<Cell>();
        var rows = sheet.Descendants<Row>();

        log.Info(string.Format("Row count = {0}", rows.LongCount()));
        log.Info(string.Format("Cell count = {0}", cells.LongCount()));

        // One way: go through each cell in the sheet
        foreach (Cell cell in cells)
        {
            if ((cell.DataType != null) && (cell.DataType == CellValues.SharedString))
            {
                int ssid = int.Parse(cell.CellValue.Text);
                string str = sst.ChildElements[ssid].InnerText;
                log.Info(string.Format("Shared string {0}: {1}", ssid, str));
            }
            else if (cell.CellValue != null)
            {
                log.Info(string.Format("Cell contents: {0}", cell.CellValue.Text));
            }
        }
    }

    return req.CreateResponse(HttpStatusCode.OK, "Hello ");
}

#r "Excel.dll"
#r "System.Data"

using System.Net;
using System.IO;
using Excel;
using System.Data;

public static HttpResponseMessage Run(HttpRequestMessage req, TraceWriter log)
{
    log.Info($"C# HTTP trigger function processed a request. RequestUri={req.RequestUri}");

    WebClient client = new WebClient();

    byte[] buffer = client.DownloadData("http://amor-webapp-test.azurewebsites.net/Content/abcdefg.xls");
    MemoryStream stream = new MemoryStream();
    stream.Write(buffer, 0, buffer.Length);
    stream.Position = 0;

    IExcelDataReader excelReader = ExcelReaderFactory.CreateBinaryReader(stream);

    DataSet result = excelReader.AsDataSet();

    for (int i = 0; i < result.Tables.Count; i++)
    {
        log.Info(result.Tables[i].TableName +" has " + result.Tables[i].Rows.Count + " rows.");
    }

    return req.CreateResponse(HttpStatusCode.OK, "Hello ");
}

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(originalExcelUrl);
using (HttpWebResponse response = (HttpWebResponse)request.GetResponse())
using (Stream stream = response.GetResponseStream())
{
    var doc = SpreadsheetDocument.Open(stream, true);
    // etc
}