using System;
using System.Runtime.InteropServices;

namespace Tanshu.Accounts.Print
{
    internal class PrinterLinux : PlatformPrinter
    {
        #region API Declarations
        // ReSharper disable InconsistentNaming
        [DllImport("libcups", CharSet = CharSet.Ansi)]
        static extern int cupsPrintFile(string printer, string filename, string title, int num_options, IntPtr options);
        // int cupsPrintFile (const char *name, const char *filename, const char *title, int num_options, cups_option_t *options);

        [DllImport("libcups", CharSet = CharSet.Ansi)]
        static extern int cupsCreateJob(string http, string name, string title, int num_options, IntPtr options);
        // int cupsCreateJob (http_t *http, const char *name, const char *title, int num_options, cups_option_t *options);

        [DllImport("libcups", CharSet = CharSet.Ansi)]
        static extern int cupsStartDocument(string http, string name, int job_id, string docname, string format, int last_document);
        // http_status_t cupsStartDocument (http_t *http, const char *name, int job_id, const char *docname, const char *format, int last_document);

        [DllImport("libcups", CharSet = CharSet.Ansi)]
        static extern int cupsWriteRequestData(string http, string buffer, int length);
        // http_status_t cupsWriteRequestData (http_t *http, const char *buffer, size_t length);

        [DllImport("libcups", CharSet = CharSet.Ansi)]
        static extern int cupsFinishDocument(string http, string name);
        // ipp_status_t cupsFinishDocument (http_t *http, const char *name);
        // ReSharper restore InconsistentNaming
        #endregion

        internal override bool Print(string printerName, string documentName, string printingText)
        {
            var cupsOption = new IntPtr(0);
            const string CUPS_HTTP_DEFAULT = "CUPS_HTTP_DEFAULT";
            var jobId = cupsCreateJob(CUPS_HTTP_DEFAULT, printerName, documentName, 0, cupsOption);
            if (jobId > 0)
            {
                const string format = "CUPS_FORMAT_TEXT";
                cupsStartDocument(CUPS_HTTP_DEFAULT, printerName, jobId, documentName, format, 1);
                cupsWriteRequestData(CUPS_HTTP_DEFAULT, printingText, printingText.Length);
                cupsFinishDocument(CUPS_HTTP_DEFAULT, printerName);
            }
            return jobId > 0;
        }
    }
}