#include <windows.h>
#include <setupapi.h>
#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
extern "C" {
#include "include/hidsdi.h"
#include "include/hidpi.h"
}

#include "prox.h"

#define OUR_VID 0x9ac4
#define OUR_PID 0x4b8f

int offline = 0;
HANDLE UsbHandle;

static void ShowError(void)
{
	char buf[1024];
	FormatMessage(FORMAT_MESSAGE_FROM_SYSTEM, NULL, GetLastError(), 0,
		buf, sizeof(buf), NULL);
	printf("ERROR: %s", buf);
}

static BOOL UsbConnect(void)
{
	typedef void (__stdcall *GetGuidProc)(GUID *);
	typedef BOOLEAN (__stdcall *GetAttrProc)(HANDLE, HIDD_ATTRIBUTES *);
	typedef BOOLEAN (__stdcall *GetPreparsedProc)(HANDLE,
										PHIDP_PREPARSED_DATA *);
	typedef NTSTATUS (__stdcall *GetCapsProc)(PHIDP_PREPARSED_DATA, PHIDP_CAPS);
	GetGuidProc			getGuid;
	GetAttrProc			getAttr;
	GetPreparsedProc	getPreparsed;
	GetCapsProc			getCaps;

	HMODULE h		= LoadLibrary("hid.dll");
	getGuid			= (GetGuidProc)GetProcAddress(h, "HidD_GetHidGuid");
	getAttr			= (GetAttrProc)GetProcAddress(h, "HidD_GetAttributes");
	getPreparsed	= (GetPreparsedProc)GetProcAddress(h, "HidD_GetPreparsedData");
	getCaps			= (GetCapsProc)GetProcAddress(h, "HidP_GetCaps");

	GUID hidGuid;
	getGuid(&hidGuid);

	HDEVINFO devInfo;
	devInfo = SetupDiGetClassDevs(&hidGuid, NULL, NULL,
		DIGCF_PRESENT | DIGCF_INTERFACEDEVICE);

	SP_DEVICE_INTERFACE_DATA devInfoData;
	devInfoData.cbSize = sizeof(devInfoData);

	int i;
	for(i = 0;; i++) {
		if(!SetupDiEnumDeviceInterfaces(devInfo, 0, &hidGuid, i, &devInfoData))
		{
			if(GetLastError() != ERROR_NO_MORE_ITEMS) {
//				printf("SetupDiEnumDeviceInterfaces failed\n");
			}
//			printf("done list\n");
			SetupDiDestroyDeviceInfoList(devInfo);
			return FALSE;
		}

//		printf("item %d:\n", i);

		DWORD sizeReqd = 0;
		if(!SetupDiGetDeviceInterfaceDetail(devInfo, &devInfoData,
			NULL, 0, &sizeReqd, NULL))
		{
			if(GetLastError() != ERROR_INSUFFICIENT_BUFFER) {
//				printf("SetupDiGetDeviceInterfaceDetail (0) failed\n");
				continue;
			}
		}

		SP_DEVICE_INTERFACE_DETAIL_DATA *devInfoDetailData =
			(SP_DEVICE_INTERFACE_DETAIL_DATA *)malloc(sizeReqd);
		devInfoDetailData->cbSize = sizeof(*devInfoDetailData);

		if(!SetupDiGetDeviceInterfaceDetail(devInfo, &devInfoData,
			devInfoDetailData, 87, NULL, NULL))
		{
//			printf("SetupDiGetDeviceInterfaceDetail (1) failed\n");
			continue;
		}

		char *path = devInfoDetailData->DevicePath;

		UsbHandle = CreateFile(path, /*GENERIC_READ |*/ GENERIC_WRITE,
			FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
			FILE_FLAG_OVERLAPPED, NULL);

		if(UsbHandle == INVALID_HANDLE_VALUE) {
			ShowError();
//			printf("CreateFile failed: for '%s'\n", path);
			continue;
		}

		HIDD_ATTRIBUTES attr;
		attr.Size = sizeof(attr);
		if(!getAttr(UsbHandle, &attr)) {
			ShowError();
//			printf("HidD_GetAttributes failed\n");
			continue;
		}

//		printf("VID: %04x PID %04x\n", attr.VendorID, attr.ProductID);

		if(attr.VendorID != OUR_VID || attr.ProductID != OUR_PID) {
			CloseHandle(UsbHandle);
//			printf("	nope, not us\n");
			continue;
		}

//		printf ("got it!\n");
		CloseHandle(UsbHandle);

		UsbHandle = CreateFile(path, GENERIC_READ | GENERIC_WRITE,
			FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
			FILE_FLAG_OVERLAPPED, NULL);

		if(UsbHandle == INVALID_HANDLE_VALUE) {
			ShowError();
//			printf("Error, couldn't open our own handle as desired.\n");
			return FALSE;
		}

		PHIDP_PREPARSED_DATA pp;
		getPreparsed(UsbHandle, &pp);
		HIDP_CAPS caps;

		if(getCaps(pp, &caps) != HIDP_STATUS_SUCCESS) {
//			printf("getcaps failed\n");
			return FALSE;
		}

//		printf("input/out report %d/%d\n", caps.InputReportByteLength,
//			caps.OutputReportByteLength);


		return TRUE;
	}
	return FALSE;
}

BOOL ReceiveCommandPoll(UsbCommand *c)
{
	static BOOL ReadInProgress = FALSE;
	static OVERLAPPED Ov;
	static BYTE Buf[65];
	static DWORD HaveRead;

	if(!ReadInProgress) {
		memset(&Ov, 0, sizeof(Ov));
		ReadFile(UsbHandle, Buf, 65, &HaveRead, &Ov);
		if(GetLastError() != ERROR_IO_PENDING) {
			ShowError();
			exit(-1);
		}
		ReadInProgress = TRUE;
	}

	if(HasOverlappedIoCompleted(&Ov)) {
		ReadInProgress = FALSE;

		if(!GetOverlappedResult(UsbHandle, &Ov, &HaveRead, FALSE)) {
			ShowError();
			exit(-1);
		}

		memcpy(c, Buf+1, 64);

		return TRUE;
	} else {
		return FALSE;
	}
}

void ReceiveCommand(UsbCommand *c)
{
	while(!ReceiveCommandPoll(c)) {
		Sleep(0);
	}
}

void SendCommand(UsbCommand *c, BOOL wantAck)
{
	BYTE buf[65];
	buf[0] = 0;
	memcpy(buf+1, c, 64);

	DWORD written;
	OVERLAPPED ov;
	memset(&ov, 0, sizeof(ov));
	WriteFile(UsbHandle, buf, 65, &written, &ov);
	if(GetLastError() != ERROR_IO_PENDING) {
		ShowError();
		exit(-1);
	}

	while(!HasOverlappedIoCompleted(&ov)) {
		Sleep(0);
	}

	if(!GetOverlappedResult(UsbHandle, &ov, &written, FALSE)) {
		ShowError();
		exit(-1);
	}

	if(wantAck) {
		UsbCommand ack;
		ReceiveCommand(&ack);
		if(ack.cmd != CMD_ACK) {
			printf("bad ACK\n");
			exit(-1);
		}
	}
}

static DWORD ExpectedAddr;
static BYTE QueuedToSend[256];
static BOOL AllWritten;

static void FlushPrevious(void)
{
	UsbCommand c;
	memset(&c, 0, sizeof(c));

	printf("expected = %08x flush, ", ExpectedAddr);

	int i;
	for(i = 0; i < 240; i += 48) {
		c.cmd = CMD_SETUP_WRITE;
		memcpy(c.d.asBytes, QueuedToSend+i, 48);
		c.ext1 = (i/4);
		SendCommand(&c, TRUE);
	}

	c.cmd = CMD_FINISH_WRITE;
	c.ext1 = (ExpectedAddr-1) & (~255);
	printf("c.ext1 = %08x\r", c.ext1);
	memcpy(c.d.asBytes, QueuedToSend+240, 16);
	SendCommand(&c, TRUE);

	AllWritten = TRUE;
}

static void GotByte(DWORD where, BYTE which)
{
	AllWritten = FALSE;

	if(where != ExpectedAddr) {
		printf("bad: got at %08x, expected at %08x\n", where, ExpectedAddr);
		exit(-1);
	}
	QueuedToSend[where & 255] = which;
	ExpectedAddr++;

	if((where & 255) == 255) {
		// we have completed a full page
		FlushPrevious();
	}
}

static int HexVal(int c)
{
	c = tolower(c);
	if(c >= '0' && c <= '9') {
		return c - '0';
	} else if(c >= 'a' && c <= 'f') {
		return (c - 'a') + 10;
	} else {
		printf("bad hex digit '%c'\n", c);
		exit(-1);
	}
}

static BYTE HexByte(char *s)
{
	return (HexVal(s[0]) << 4) | HexVal(s[1]);
}

static void LoadFlashFromSRecords(char *file, int addr)
{
	ExpectedAddr = addr;

	FILE *f = fopen(file, "r");
	if(!f) {
		printf("couldn't open file\n");
		exit(-1);
	}

	char line[512];
	while(fgets(line, sizeof(line), f)) {
		if(memcmp(line, "S3", 2)==0) {
			char *s = line + 2;
			int len = HexByte(s) - 5;
			s += 2;

			char addrStr[9];
			memcpy(addrStr, s, 8);
			addrStr[8] = '\0';
			DWORD addr;
			sscanf(addrStr, "%x", &addr);
			s += 8;

			int i;
			for(i = 0; i < len; i++) {
				while((addr+i) > ExpectedAddr) {
					GotByte(ExpectedAddr, 0xff);
				}
				GotByte(addr+i, HexByte(s));
				s += 2;
			}
		}
	}

	if(!AllWritten) FlushPrevious();

	fclose(f);
	printf("\ndone.\n");
}

int main(int argc, char **argv)
{
	int i = 0;
	
	if(argc < 2) {
		printf("Usage: %s bootrom file.s19\n", argv[0]);
		printf("       %s load osimage.s19\n", argv[0]);
		printf("       %s fpga fpgaimg.s19\n", argv[0]);
		printf("       %s gui\n", argv[0]);
		printf("       %s offline\n", argv[0]);
		return -1;
	}
	
	// Only do this if NOT in offline mode
	if (strcmp(argv[1], "offline"))
	{
		for(;;) {
			if(UsbConnect()) {
				break;
			}
			if(i == 0) {
				printf("...no device connected, polling for it now\n");
			}
			if(i > 50000) {
				printf("Could not connect to USB device; exiting.\n");
				return -1;
			}
			i++;
			Sleep(5);
		}
	}
	
	if(strcmp(argv[1], "bootrom")==0 || strcmp(argv[1], "load")==0 || strcmp(argv[1], "fpga")==0) {
		if(argc != 3) {
			printf("Need filename.\n");
			return -1;
		}
		if(strcmp(argv[1], "bootrom")==0) {
			LoadFlashFromSRecords(argv[2], 0);
		} else if(strcmp(argv[1], "fpga")==0) {
			LoadFlashFromSRecords(argv[2], 0x2000);
		} else {
			LoadFlashFromSRecords(argv[2], 0x10000);
		}
	} else if(strcmp(argv[1], "gui")==0) {
		ShowGui();
	} else if(strcmp(argv[1], "offline")==0) {
		offline = 1;
		ShowGui();
	} else if(strcmp(argv[1], "cmd")==0) {
		if(argc != 3) {
			printf("Need command.\n");
			return -1;
		}
		ExecCmd(argv[2]);
	} else {
		printf("Command '%s' not recognized.\n", argv[1]);
		return -1;
	}

	return 0;
}