#include <stdlib.h>
#include <stdio.h>
#include <string.h>

#include "dive.h"
#include "gettext.h"
#include "divelist.h"
#include "libdivecomputer.h"

/*
 * Returns a dc_descriptor_t structure based on dc  model's number and family.
 */

static dc_descriptor_t *ostc_get_data_descriptor(int data_model, dc_family_t data_fam)
{
	dc_descriptor_t *descriptor = NULL, *current = NULL;;
	dc_iterator_t *iterator = NULL;
	dc_status_t rc;

	rc = dc_descriptor_iterator(&iterator);
	if (rc != DC_STATUS_SUCCESS) {
		fprintf(stderr,"Error creating the device descriptor iterator.\n");
		return current;
	}
	while ((dc_iterator_next(iterator, &descriptor)) == DC_STATUS_SUCCESS) {
		int desc_model = dc_descriptor_get_model(descriptor);
		dc_family_t desc_fam = dc_descriptor_get_type(descriptor);
		if (data_model == desc_model && data_fam == desc_fam) {
			current = descriptor;
			break;
		}
		dc_descriptor_free(descriptor);
	}
	dc_iterator_free(iterator);
	return current;
}

/*
 * Fills a device_data_t structure with known dc data and a descriptor.
 */
static void ostc_prepare_data(int data_model, dc_family_t dc_fam, device_data_t *dev_data)
{
	device_data_t *ldc_dat = calloc(1, sizeof(device_data_t));
	dc_descriptor_t *data_descriptor;

	*ldc_dat = *dev_data;
	ldc_dat->device = NULL;
	ldc_dat->context = NULL;

	data_descriptor = ostc_get_data_descriptor(data_model, dc_fam);
	if (data_descriptor) {
		ldc_dat->descriptor = data_descriptor;
		ldc_dat->vendor = copy_string(data_descriptor->vendor);
		ldc_dat->model = copy_string(data_descriptor->product);
		*dev_data = *ldc_dat;
	}
	free(ldc_dat);
}

/*
 * OSTCTools stores the raw dive data in heavily padded files, one dive
 * each file. So it's not necesary to iterate once and again on a parsing
 * function. Actually there's only one kind of archive for every DC model.
 */
void ostctools_import(const char *file, struct dive_table *divetable)
{
	FILE *archive;
	device_data_t *devdata = calloc(1, sizeof(device_data_t));
	dc_family_t dc_fam;
	unsigned char *buffer = calloc(65536, 1),
		      *tmp;
	struct dive *ostcdive = alloc_dive();
	dc_status_t rc = 0;
	int model = 0, i = 0;
	unsigned int serial;
	struct extra_data *ptr;

	// Open the archive
	if ((archive = subsurface_fopen(file, "rb")) == NULL) {
		report_error(translate("gettextFromC", "Error: couldn't open the file"));
		return;
	}

	// Read dive number from the log
	tmp =  calloc(2,1);
	fseek(archive, 258, 0);
	fread(tmp, 1, 2, archive);
	ostcdive->number = tmp[0] + (tmp[1] << 8);
	free(tmp);

	// Read device's serial number
	tmp = calloc(2, 1);
	fseek(archive, 265, 0);
	fread(tmp, 1, 2, archive);
	serial = tmp[0] + (tmp[1] << 8);
	free(tmp);

	// Read dive's raw data, header + profile
	fseek(archive, 456, 0);
	while (!feof(archive)) {
		fread(buffer+i, 1, 1, archive);
		if (buffer[i] == 0xFD && buffer[i-1] == 0xFD)
			break;
		i++;
	}

	// Try to determine the dc family based on the header type
	switch (buffer[2]) {
		case 0x20:
		case 0x21:
			dc_fam = DC_FAMILY_HW_OSTC;
			break;
		case 0x22:
			dc_fam = DC_FAMILY_HW_FROG;
			break;
		case 0x23:
			dc_fam = DC_FAMILY_HW_OSTC3;
			break;
	}

	// Prepare data to pass to libdivecomputer. OSTC protocol doesn't include
	// a model number so will use 0.
	ostc_prepare_data(model, dc_fam, devdata);
	tmp = calloc(strlen(devdata->vendor)+strlen(devdata->model)+28,1);
	sprintf(tmp,"%s %s (Imported from OSTCTools)", devdata->vendor, devdata->model);
	ostcdive->dc.model =  copy_string(tmp);
	free(tmp);

	// Parse the dive data
	rc = libdc_buffer_parser(ostcdive, devdata, buffer, i+1);
	if (rc != DC_STATUS_SUCCESS)
		report_error("Libdc returned error -%s- for dive %d", errmsg(rc), ostcdive->number);

	// Serial number is not part of the header nor the profile, so libdc won't
	// catch it. If Serial is part of the extra_data, and set to zero, remove
	// it from the list and add again.
	tmp = calloc(12,1);
	sprintf(tmp, "%d", serial);
	ostcdive->dc.serial = copy_string(tmp);
	free(tmp);

	ptr = ostcdive->dc.extra_data;
	while (strcmp(ptr->key, "Serial"))
		ptr = ptr->next;
	if (!strcmp(ptr->value, "0")) {
		add_extra_data(&ostcdive->dc, "Serial", ostcdive->dc.serial);
		*ptr = *(ptr)->next;
	}

	free(devdata);
	free(buffer);
	record_dive_to_table(ostcdive, divetable);
	mark_divelist_changed(true);
	sort_table(divetable);
	fclose(archive);
}