#include "config.h"

#include <assert.h>
#include <errno.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "logerr.h"
#include "math.h"
#include "util.h"

#include "string.h"



struct String {
	const size_t length;
	const uint8_t *const bytes;
};



int
string_new_with(
	const char *const string,
	const size_t length,
	const struct String **const out
) {
	int rc = -1;

	const struct String *ret = NULL;
	const uint8_t *bytes = NULL;

	ret = malloc(sizeof(*ret));
	if (ret == NULL) {
		logerr("malloc(): %s", strerror(errno));
		goto out;
	}

	bytes = malloc(length + NULL_TERMINATOR);
	if (bytes == NULL) {
		logerr("malloc(): %s", strerror(errno));
		goto out;
	}

	memcpy((void *)bytes, string, length);
	memcpy((void *)(bytes + length), "", NULL_TERMINATOR);
	memcpy((void *)ret, &(struct String) {
		.length = length,
		.bytes  = bytes,
	}, sizeof(*ret));
	*out = ret;
	rc = 0;
out:
	if (rc) {
		if (bytes != NULL) {
			freeit((void *)&bytes);
		}
		if (ret != NULL) {
			freeit((void *)&ret);
		}
	}
	return rc;
}

int
string_new(const char *const string, const struct String **const out) {
	return string_new_with(string, strlen(string), out);
}

void
string_free(const struct String **const s) {
	free((void *)(*s)->bytes);
	free((void *)(*s));
	*s = NULL;
}

const char *
cstr(const struct String *s) {
	return (const char *)s->bytes;
}

enum Comparison
string_compare(const struct String *const s1, const struct String *const s2) {
	if (s1->length < s2->length) {
		return Comparison_LT;
	} else if (s1->length > s2->length) {
		return Comparison_GT;
	} else {
		const int ret = strcmp((const char *)s1->bytes, (const char *)s2->bytes);
		if (ret < 0) {
			return Comparison_LT;
		} else if (ret > 0) {
			return Comparison_GT;
		} else {
			return Comparison_EQ;
		}
	}
}

bool
string_equals(const struct String *const s1, const struct String *const s2) {
	return string_compare(s1, s2) == Comparison_EQ;
}

int
string_append(
	const struct String *const s1,
	const struct String *const s2,
	const struct String **const out
) {
	int rc = -1;

	const struct String *ret = NULL;
	const uint8_t *bytes = NULL;

	size_t length;
	if (add_size(s1->length, s2->length, &length)) {
		logerr("add_size()");
		goto out;
	}

	ret = malloc(sizeof(*ret));
	if (ret == NULL) {
		logerr("malloc(): %s", strerror(errno));
		goto out;
	}

	bytes = malloc(length + NULL_TERMINATOR);
	if (bytes == NULL) {
		logerr("malloc(): %s", strerror(errno));
		goto out;
	}

	memcpy((void *)bytes, s1->bytes, s1->length);
	memcpy((void *)(bytes + s1->length), s2->bytes, s2->length);
	memcpy((void *)(bytes + length), "", NULL_TERMINATOR);
	memcpy((void *)ret, &(struct String) {
		.length = length,
		.bytes  = bytes,
	}, sizeof(*ret));
	*out = ret;
	rc = 0;
out:
	if (rc) {
		if (bytes != NULL) {
			freeit((void *)&bytes);
		}
		if (ret != NULL) {
			freeit((void *)&ret);
		}
	}
	return rc;
}