#include "parseargs.hfa"

#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
extern "C" {
	#include <getopt.h>
	#include <sys/ioctl.h>

	struct FILE;
	extern FILE * stderr;
	extern FILE * stdout;

	extern int fileno(FILE *stream);

	extern int fprintf ( FILE * stream, const char * format, ... );

	extern          long long int strtoll (const char* str, char** endptr, int base);
	extern unsigned long long int strtoull(const char* str, char** endptr, int base);
	extern                 double strtod  (const char* str, char** endptr);
}

#include "common.hfa"
#include "limits.hfa"

extern int cfa_args_argc __attribute__((weak));
extern char ** cfa_args_argv __attribute__((weak));
extern char ** cfa_args_envp __attribute__((weak));

static void usage(char * cmd, cfa_option options[], size_t opt_count, const char * usage, FILE * out)  __attribute__ ((noreturn));
//-----------------------------------------------------------------------------
// checking
static void check_args(cfa_option options[], size_t opt_count) {
	for(i; opt_count) {
		for(j; opt_count) {
			if(i == j) continue;

			if( options[i].short_name != '\0'
			&& options[i].short_name == options[j].short_name)
				abort("Parse Args error: two options have short name '%c' (%zu & %zu)", options[i].short_name, i, j);

			if(0 == strcmp(options[i].long_name, options[j].long_name)) abort("Parse Args error: two options have long name '%s' (%zu & %zu)", options[i].long_name, i, j);
		}
	}
}


//-----------------------------------------------------------------------------
// Parsing args
void parse_args( cfa_option options[], size_t opt_count, const char * usage, char ** & left ) {
	if( 0p != &cfa_args_argc ) {
		parse_args(cfa_args_argc, cfa_args_argv, options, opt_count, usage, left );
	}
	else {
		char * temp = "";
		parse_args(0, &temp, options, opt_count, usage, left );
	}
}

void parse_args(
	int argc,
	char * argv[],
	cfa_option options[],
	size_t opt_count,
	const char * usage,
	char ** & left
) {
	check_args(options, opt_count);

	int maxv = 'h';
	char optstring[opt_count * 3] = { '\0' };
	{
		int idx = 0;
		for(i; opt_count) {
			if (options[i].short_name) {
				maxv = max(options[i].short_name, maxv);
				optstring[idx] = options[i].short_name;
				idx++;
				if(    ((intptr_t)options[i].parse) != ((intptr_t)parse_settrue)
				&& ((intptr_t)options[i].parse) != ((intptr_t)parse_setfalse) ) {
					optstring[idx] = ':';
					idx++;
				}
			}
		}
		optstring[idx+0] = 'h';
		optstring[idx+1] = '\0';
	}

	struct option optarr[opt_count + 2];
	{
		int idx = 0;
		for(i; opt_count) {
			if(options[i].long_name) {
				options[i].val = (options[i].short_name != '\0') ? ((int)options[i].short_name) : ++maxv;
				optarr[idx].name = options[i].long_name;
				optarr[idx].flag = 0p;
				optarr[idx].val  = options[i].val;
				if(    ((intptr_t)options[i].parse) == ((intptr_t)parse_settrue)
				    || ((intptr_t)options[i].parse) == ((intptr_t)parse_setfalse) ) {
					optarr[idx].has_arg = no_argument;
				} else {
					optarr[idx].has_arg = required_argument;
				}
				idx++;
			}
		}
		optarr[idx+0].[name, has_arg, flag, val] = ["help", no_argument, 0, 'h'];
		optarr[idx+1].[name, has_arg, flag, val] = [0, no_argument, 0, 0];
	}

	FILE * out = stderr;
	NEXT_ARG:
	for() {
		int idx = 0;
		int opt = getopt_long(argc, argv, optstring, optarr, &idx);
		switch(opt) {
			case -1:
				if(&left != 0p) left = argv + optind;
				return;
			case 'h':
				out = stdout;
			case '?':
				usage(argv[0], options, opt_count, usage, out);
			default:
				for(i; opt_count) {
					if(opt == options[i].val) {
						const char * arg = optarg ? optarg : "";
						if( arg[0] == '=' ) { arg++; }
						bool success = options[i].parse( arg, options[i].variable );
						if(success) continue NEXT_ARG;

						fprintf(out, "Argument '%s' for option %c could not be parsed\n\n", arg, (char)opt);
						usage(argv[0], options, opt_count, usage, out);
					}
				}
				abort("Internal parse arg error\n");
		}

	}
}

//-----------------------------------------------------------------------------
// Print usage
static void printopt(FILE * out, int width, int max, char sn, const char * ln, const char * help) {
	int hwidth = max - (11 + width);
	if(hwidth <= 0) hwidth = max;

	char sname[4] = { ' ', ' ', ' ', '\0' };
	if(sn != '\0') {
		sname[0] = '-';
		sname[1] = sn;
		sname[2] = ',';
	}

	fprintf(out, "  %s --%-*s   %.*s\n", sname, width, ln, hwidth, help);
	for() {
		help += min(strlen(help), hwidth);
		if('\0' == *help) break;
		fprintf(out, "%*s%.*s\n", width + 11, "", hwidth, help);
	}
}

void print_args_usage(cfa_option options[], size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn)) {
	usage(cfa_args_argv[0], options, opt_count, usage, error ? stderr : stdout);
}

void print_args_usage(int , char * argv[], cfa_option options[], size_t opt_count, const char * usage, bool error)  __attribute__ ((noreturn)) {
	usage(argv[0], options, opt_count, usage, error ? stderr : stdout);
}

static void usage(char * cmd, cfa_option options[], size_t opt_count, const char * help, FILE * out) __attribute__((noreturn)) {
	int width = 0;
	{
		for(i; opt_count) {
			if(options[i].long_name) {
				int w = strlen(options[i].long_name);
				if(w > width) width = w;
			}
		}
	}

	int max_width = 1_000_000;
	int outfd = fileno(out);
	if(isatty(outfd)) {
		struct winsize size;
		int ret = ioctl(outfd, TIOCGWINSZ, &size);
		if(ret < 0) abort( "ioctl error: (%d) %s\n", (int)errno, strerror(errno) );
		max_width = size.ws_col;
	}

	fprintf(out, "Usage:\n  %s %s\n", cmd, help);

	for(i; opt_count) {
		printopt(out, width, max_width, options[i].short_name, options[i].long_name, options[i].help);
	}
	fprintf(out, "  -%c, --%-*s   %s\n", 'h', width, "help", "print this help message");
	exit(out == stdout ? 0 : 1);
}

//-----------------------------------------------------------------------------
// Typed argument parsing
bool parse_yesno(const char * arg, bool & value ) {
	if(strcmp(arg, "yes") == 0) {
		value = true;
		return true;
	}

	if(strcmp(arg, "no") == 0) {
		value = false;
		return true;
	}

	return false;
}

bool parse_truefalse(const char * arg, bool & value) {
	if(strcmp(arg, "true") == 0) {
		value = true;
		return true;
	}

	if(strcmp(arg, "false") == 0) {
		value = false;
		return true;
	}

	return false;
}

bool parse_settrue (const char *, bool & value ) {
	value = true;
	return true;
}

bool parse_setfalse(const char *, bool & value )  {
	value = false;
	return true;
}

bool parse(const char * arg, const char * & value ) {
	value = arg;
	return true;
}

bool parse(const char * arg, int & value) {
	char * end;
	int r = strtoll(arg, &end, 10);
	if(*end != '\0') return false;

	value = r;
	return true;
}

bool parse(const char * arg, unsigned & value) {
	char * end;
	unsigned long long int r = strtoull(arg, &end, 10);
	if(*end != '\0') return false;
	if(r > (unsigned)MAX) return false;

	value = r;
	return true;
}

bool parse(const char * arg, unsigned long & value) {
	char * end;
	unsigned long long int r = strtoull(arg, &end, 10);
	if(*end != '\0') return false;
	if(r > (unsigned long)MAX) return false;

	value = r;
	return true;
}

bool parse(const char * arg, unsigned long long & value) {
        char * end;
        unsigned long long int r = strtoull(arg, &end, 10);
        if(*end != '\0') return false;
        if(r > (unsigned long long)MAX) return false;

        value = r;
        return true;
}

bool parse(const char * arg, double & value) {
	char * end;
	double r = strtod(arg, &end);
	if(*end != '\0') return false;

	value = r;
	return true;
}