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#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include <getopt.h>
#include "igzip_lib.h"
#include "test.h"

#define BUF_SIZE 1024
#define MIN_TEST_LOOPS   10
#ifndef RUN_MEM_SIZE
# define RUN_MEM_SIZE 500000000
#endif

struct isal_zstream stream;

int usage(void)
{
	fprintf(stderr,
		"Usage: igzip_file_perf [options] <infile>\n"
		"  -h        help\n"
		"  -X        use compression level X with 0 <= X <= 1\n"
		"  -b <size> input buffer size, 0 buffers all the input\n"
		"  -i <iter> number of iterations (at least 1)\n"
		"  -o <file> output file for compresed data\n");
	exit(0);
}

int get_filesize(FILE * f)
{
	int curr, end;

	curr = ftell(f);	/* Save current position */
	fseek(f, 0L, SEEK_END);
	end = ftell(f);
	fseek(f, curr, SEEK_SET);	/* Restore position */
	return end;
}

int main(int argc, char *argv[])
{
	FILE *in, *out = NULL;
	unsigned char *inbuf, *outbuf, *level_buf = NULL;
	int i, c, infile_size, iterations = 0, outbuf_size, inbuf_size = 0;
	struct isal_huff_histogram histogram;
	struct isal_hufftables hufftables_custom;
	int level = 0, level_size = 0, avail_in;
	char *in_file_name = NULL, *out_file_name = NULL;

	while ((c = getopt(argc, argv, "h01i:b:o:")) != -1) {
		switch (c) {
		case 'o':
			out_file_name = optarg;
			break;
		case 'i':
			iterations = atoi(optarg);
			if (iterations < 1)
				usage();
			break;
		case 'b':
			inbuf_size = atoi(optarg);
			break;
		case '1':
			level = 1;
			level_size = ISAL_DEF_LVL1_LARGE;
			break;
		case '0':
			break;
		case 'h':
		default:
			usage();
			break;
		}
	}

	if (optind < argc) {
		in_file_name = argv[optind];
		in = fopen(in_file_name, "rb");
	} else
		usage();

	if (!in) {
		fprintf(stderr, "Can't open %s for reading\n", in_file_name);
		exit(0);
	}
	if (out_file_name != NULL) {
		out = fopen(out_file_name, "wb");
		if (!out) {
			fprintf(stderr, "Can't open %s for writing\n", out_file_name);
			exit(0);
		}
		printf("outfile=%s\n", out_file_name);
	}

	printf("Window Size: %d K\n", IGZIP_HIST_SIZE / 1024);
	printf("igzip_file_perf: \n");
	fflush(0);

	/* Allocate space for entire input file and output
	 * (assuming some possible expansion on output size)
	 */
	infile_size = get_filesize(in);

	outbuf_size = 2 * infile_size + BUF_SIZE;

	if (iterations == 0) {
		iterations = infile_size ? RUN_MEM_SIZE / infile_size : MIN_TEST_LOOPS;
		if (iterations < MIN_TEST_LOOPS)
			iterations = MIN_TEST_LOOPS;
	}

	inbuf = malloc(infile_size);
	if (inbuf == NULL) {
		fprintf(stderr, "Can't allocate input buffer memory\n");
		exit(0);
	}
	outbuf = malloc(outbuf_size);
	if (outbuf == NULL) {
		fprintf(stderr, "Can't allocate output buffer memory\n");
		exit(0);
	}

	if (level_size != 0) {
		level_buf = malloc(level_size);
		if (level_buf == NULL) {
			fprintf(stderr, "Can't allocate level buffer memory\n");
			exit(0);
		}
	}

	inbuf_size = inbuf_size ? inbuf_size : infile_size;

	printf("igzip_file_perf: %s %d iterations\n", in_file_name, iterations);
	/* Read complete input file into buffer */
	stream.avail_in = (uint32_t) fread(inbuf, 1, infile_size, in);
	if (stream.avail_in != infile_size) {
		fprintf(stderr, "Couldn't fit all of input file into buffer\n");
		exit(0);
	}

	struct perf start, stop;
	perf_start(&start);

	for (i = 0; i < iterations; i++) {
		isal_deflate_init(&stream);
		stream.end_of_stream = 0;
		stream.flush = NO_FLUSH;
		stream.level = level;
		stream.level_buf = level_buf;
		stream.level_buf_size = level_size;
		stream.next_out = outbuf;
		stream.avail_out = outbuf_size;
		stream.next_in = inbuf;
		avail_in = infile_size;

		while (avail_in > 0) {
			stream.avail_in = avail_in >= inbuf_size ? inbuf_size : avail_in;
			avail_in -= inbuf_size;

			if (avail_in <= 0)
				stream.end_of_stream = 1;

			isal_deflate(&stream);

			if (stream.avail_in != 0)
				break;
		}
	}

	perf_stop(&stop);

	if (stream.avail_in != 0) {
		fprintf(stderr, "Could not compress all of inbuf\n");
		exit(0);
	}

	printf("  file %s - in_size=%d out_size=%d iter=%d ratio=%3.1f%%",
	       in_file_name, infile_size, stream.total_out, i,
	       100.0 * stream.total_out / infile_size);

	if (level == 0) {
		memset(&histogram, 0, sizeof(histogram));

		isal_update_histogram(inbuf, infile_size, &histogram);
		isal_create_hufftables(&hufftables_custom, &histogram);

		isal_deflate_init(&stream);
		stream.end_of_stream = 0;
		stream.flush = NO_FLUSH;
		stream.level = level;
		stream.level_buf = level_buf;
		stream.level_buf_size = level_size;
		stream.next_out = outbuf;
		stream.avail_out = outbuf_size;
		stream.next_in = inbuf;
		stream.hufftables = &hufftables_custom;
		avail_in = infile_size;

		while (avail_in > 0) {
			stream.avail_in = avail_in >= inbuf_size ? inbuf_size : avail_in;
			avail_in -= inbuf_size;

			if (avail_in <= 0)
				stream.end_of_stream = 1;

			isal_deflate(&stream);

			if (stream.avail_in != 0)
				break;
		}

		printf(" ratio_custom=%3.1f%%", 100.0 * stream.total_out / infile_size);
	}
	printf("\n");

	if (stream.avail_in != 0) {
		fprintf(stderr, "Could not compress all of inbuf\n");
		exit(0);
	}

	printf("igzip_file: ");
	perf_print(stop, start, (long long)infile_size * i);

	if (argc > 2 && out) {
		printf("writing %s\n", out_file_name);
		fwrite(outbuf, 1, stream.total_out, out);
		fclose(out);
	}

	fclose(in);
	printf("End of igzip_file_perf\n\n");
	fflush(0);
	return 0;
}