#define FUSE_USE_VERSION 26

#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <fuse.h>
#include <tcl.h>

#define APPFS_DEBUG(x...) { fprintf(stderr, "%i:%s: ", __LINE__, __func__); fprintf(stderr, x); fprintf(stderr, "\n"); }

Tcl_Interp *interp;

typedef enum {
	APPFS_OS_UNKNOWN,
	APPFS_OS_ALL,
	APPFS_OS_LINUX,
	APPFS_OS_MACOSX,
	APPFS_OS_FREEBSD,
	APPFS_OS_OPENBSD,
	APPFS_OS_SOLARIS
} appfs_os_t;

typedef enum {
	APPFS_CPU_UNKNOWN,
	APPFS_CPU_ALL,
	APPFS_CPU_AMD64,
	APPFS_CPU_I386,
	APPFS_CPU_ARM
} appfs_cpuArch_t;

struct appfs_package {
	char name[128];
	char version[64];
	appfs_os_t os;
	appfs_cpuArch_t cpuArch;
	int isLatest;
};

static appfs_os_t appfs_convert_os_fromString(const char *os) {
	if (strcasecmp(os, "Linux") == 0) {
		return(APPFS_OS_LINUX);
	}

	if (strcasecmp(os, "Darwin") == 0 || strcasecmp(os, "Mac OS") == 0 || strcasecmp(os, "Mac OS X") == 0) {
		return(APPFS_OS_MACOSX);
	}

	if (strcasecmp(os, "noarch") == 0) {
		return(APPFS_OS_ALL);
	}

	return(APPFS_OS_UNKNOWN);
}

static const char *appfs_convert_os_toString(appfs_os_t os) {
	switch (os) {
		case APPFS_OS_ALL:
			return("noarch");
		case APPFS_OS_LINUX:
			return("linux");
		case APPFS_OS_MACOSX:
			return("macosx");
		case APPFS_OS_FREEBSD:
			return("freebsd");
		case APPFS_OS_OPENBSD:
			return("openbsd");
		case APPFS_OS_SOLARIS:
			return("freebsd");
		case APPFS_CPU_UNKNOWN:
			return("unknown");
	}

	return("unknown");
}

static appfs_cpuArch_t appfs_convert_cpu_fromString(const char *cpu) {
	if (strcasecmp(cpu, "amd64") == 0 || strcasecmp(cpu, "x86_64") == 0) {
		return(APPFS_CPU_AMD64);
	}

	if (strcasecmp(cpu, "i386") == 0 || \
	    strcasecmp(cpu, "i486") == 0 || \
	    strcasecmp(cpu, "i586") == 0 || \
	    strcasecmp(cpu, "i686") == 0 || \
	    strcasecmp(cpu, "ix86") == 0) {
		return(APPFS_CPU_I386);
	}

	if (strcasecmp(cpu, "arm") == 0) {
		return(APPFS_CPU_ARM);
	}

	if (strcasecmp(cpu, "noarch") == 0) {
		return(APPFS_CPU_ALL);
	}

	return(APPFS_CPU_UNKNOWN);
}

static const char *appfs_convert_cpu_toString(appfs_cpuArch_t cpu) {
	switch (cpu) {
		case APPFS_CPU_ALL:
			return("noarch");
		case APPFS_CPU_AMD64:
			return("amd64");
		case APPFS_CPU_I386:
			return("ix86");
		case APPFS_CPU_ARM:
			return("arm");
		case APPFS_CPU_UNKNOWN:
			return("unknown");
	}

	return("unknown");
}

static struct appfs_package *appfs_getindex(const char *hostname, int *package_count_p) {
	Tcl_Obj *objv[2];
	Tcl_Obj *packages_tcl;
	int tcl_ret;

	if (package_count_p == NULL) {
		return(NULL);
	}

	objv[0] = Tcl_NewStringObj("::appfs::getindex", -1);
	objv[1] = Tcl_NewStringObj(hostname, -1);

	tcl_ret = Tcl_EvalObjv(interp, 2, &objv, 0);
	if (tcl_ret != TCL_OK) {
		APPFS_DEBUG("Call to ::appfs::getindex failed: %s", Tcl_GetStringResult(interp));

		return(NULL);
	}

	packages_tcl = Tcl_GetObjResult(interp);

	return(NULL);
}

static int appfs_getfile(const char *hostname, const char *sha1) {
}

static int appfs_getmanifest(const char *hostname, const char *sha1) {
}

static int appfs_getattr(const char *path, struct stat *stbuf) {
	int res = 0;

	APPFS_DEBUG("Enter (path = %s, ...)", path);

	memset(stbuf, 0, sizeof(struct stat));

	stbuf->st_mode = S_IFDIR | 0755;
	stbuf->st_nlink = 2;

	return res;
}

static int appfs_readdir(const char *path, void *buf, fuse_fill_dir_t filler, off_t offset, struct fuse_file_info *fi) {
	APPFS_DEBUG("Enter (path = %s, ...)", path);

	filler(buf, ".", NULL, 0);
	filler(buf, "..", NULL, 0);

	return 0;
}

static int appfs_open(const char *path, struct fuse_file_info *fi) {
	return(-ENOENT);
}

static int appfs_read(const char *path, char *buf, size_t size, off_t offset, struct fuse_file_info *fi) {
	return(-ENOENT);
}

#ifdef APPFS_TEST_DRIVER
static int appfs_test_driver(void) {
	struct appfs_package *packages;
	int packages_count = 0;

	packages = appfs_getindex("rkeene.org", &packages_count);
	if (packages == NULL || packages_count == 0) {
		fprintf(stderr, "Unable to fetch package index from rkeene.org.\n");

		return(1);
	}

	return(0);
}
#endif

static struct fuse_operations appfs_oper = {
	.getattr	= appfs_getattr,
	.readdir	= appfs_readdir,
	.open		= appfs_open,
	.read		= appfs_read,
};

int main(int argc, char **argv) {
	int tcl_ret;

	interp = Tcl_CreateInterp();
	if (interp == NULL) {
		fprintf(stderr, "Unable to create Tcl Interpreter.  Aborting.\n");

		return(1);
	}

	tcl_ret = Tcl_Init(interp);
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl.  Aborting.\n");

		return(1);
	}

	tcl_ret = Tcl_Eval(interp, ""
#include "appfs.tcl.h"
	"");
	if (tcl_ret != TCL_OK) {
		fprintf(stderr, "Unable to initialize Tcl AppFS Script.  Aborting.\n");

		return(1);
	}

#ifdef APPFS_TEST_DRIVER
	return(appfs_test_driver());
#else
	return(fuse_main(argc, argv, &appfs_oper, NULL));
#endif
}