#include <stdio.h>

#include <string.h>

#include <stdarg.h>

#include <unistd.h>

#include <fcntl.h>

#include <errno.h>

#include <expat.h>

#include "razor.h"

#define XML_BUFFER_SIZE 4096

static void

parse_xml_file(const char *filename,

	       XML_StartElementHandler start,

	       XML_EndElementHandler end,

	       void *data)

{

	XML_Parser parser;

	char *buffer;

	int fd, len, err;

	parser = XML_ParserCreate(NULL);

	XML_SetElementHandler(parser, start, end);

	XML_SetUserData(parser, data);

	buffer = XML_GetBuffer(parser, XML_BUFFER_SIZE);

	fd = open(filename, O_RDONLY);

	if (fd < 0) {

		fprintf(stderr, "failed to open %s: %m\n", filename);

		exit(-1);

	}

	while (len = read(fd, buffer, XML_BUFFER_SIZE), len > 0) {

		err = XML_ParseBuffer(parser, len, len == 0);

		if (err == XML_STATUS_ERROR) {

			fprintf(stderr, "parse error at line %lu:\n%s\n",

				XML_GetCurrentLineNumber(parser),

				XML_ErrorString(XML_GetErrorCode(parser)));

			exit(-1);

		}

	}

	if (fd < 0) {

		fprintf(stderr, "read: %m\n");

		exit(-1);

	}

	close(fd);

}

struct test_context {

	struct razor_set *system_set, *repo_set, *result_set;

	struct razor_importer *importer;

	struct razor_set **importer_set;

	char *install_pkgs[3], *remove_pkgs[3];

	int n_install_pkgs, n_remove_pkgs;

	int in_result, result_errors;

	int in_unsatisfiable;

};

static void

get_atts(const char **atts, ...)

{

	va_list ap;

	const char *name, **ptr;

	int i;

	va_start(ap, atts);

	while (name = va_arg(ap, const char *), name != NULL) {

		ptr = va_arg(ap, const char **);

		*ptr = NULL;

		for (i = 0; atts[i]; i += 2) {

			if (strcmp(atts[i], name) == 0)

				*ptr = atts[i + 1];

		}

	}

	va_end(ap);

}

static enum razor_version_relation

parse_relation (const char *rel_str)

{

	if (!rel_str)

		return -1;

	if (rel_str[0] == 'l')

		return rel_str[1] == 'e' ? RAZOR_VERSION_LESS_OR_EQUAL : RAZOR_VERSION_LESS;

	else if (rel_str[0] == 'g')

		return rel_str[1] == 'e' ? RAZOR_VERSION_GREATER_OR_EQUAL : RAZOR_VERSION_GREATER;

	else if (rel_str[0] == 'e' || rel_str[1] == 'q')

		return RAZOR_VERSION_EQUAL;

	else

		return -1;

}

static void

start_test(struct test_context *ctx, const char **atts)

{

	const char *name = NULL;

	get_atts(atts, "name", &name, NULL);

	if (!name) {

		fprintf(stderr, "Test with no name\n");

		exit(1);

	}

	printf("%s\n", name);

}

static void

end_test(struct test_context *ctx)

{

	if (ctx->system_set) {

		razor_set_destroy(ctx->system_set);

		ctx->system_set = NULL;

	}

	if (ctx->repo_set) {

		razor_set_destroy(ctx->repo_set);

		ctx->repo_set = NULL;

	}

	if (ctx->result_set) {

		razor_set_destroy(ctx->result_set);

		ctx->result_set = NULL;

	}

}

static void

start_set(struct test_context *ctx, const char **atts)

{

	const char *name = NULL;

	ctx->importer = razor_importer_new();

	get_atts(atts, "name", &name, NULL);

	if (!name)

		ctx->importer_set = &ctx->result_set;

	else if (!strcmp(name, "system"))

		ctx->importer_set = &ctx->system_set;

	else if (!strcmp(name, "repo"))

		ctx->importer_set = &ctx->repo_set;

	else {

		fprintf(stderr, "  bad set name '%s'\n", name);

		exit(1);

	}

}

static void

end_set(struct test_context *ctx)

{

	*ctx->importer_set = razor_importer_finish(ctx->importer);

	ctx->importer = NULL;

}

static void

start_package(struct test_context *ctx, const char **atts)

{

	const char *name = NULL, *version = NULL, *arch = NULL;

	get_atts(atts, "name", &name, "version", &version, "arch", &arch, NULL);

	if (!name) {

		fprintf(stderr, "  package with no name\n");

		exit(1);

	}

	razor_importer_begin_package(ctx->importer, name, version);

	razor_importer_add_property(ctx->importer, name,

				    RAZOR_VERSION_EQUAL, version,

				    RAZOR_PROPERTY_PROVIDES);

}

static void

end_package(struct test_context *ctx)

{

	razor_importer_finish_package(ctx->importer);

}

static void

start_property(struct test_context *ctx, enum razor_property_type type, const char **atts)

{

	const char *name = NULL, *rel_str = NULL, *version = NULL;

	enum razor_version_relation rel;

	if (ctx->in_unsatisfiable)

		return;

	get_atts(atts, "name", &name, "rel", &rel_str, "version", &version, NULL);

	if (name == NULL) {

		fprintf(stderr, "  no name specified for property\n");

		exit(1);

	}

	if (version) {

		rel = parse_relation(rel_str);

		if (rel == -1) {

			fprintf(stderr, "  bad or missing version relation for property %s\n", name);

			exit(1);

		}

	} else

		rel = RAZOR_VERSION_EQUAL;

	razor_importer_add_property(ctx->importer, name,

				    rel, version, type);

}

static void

start_transaction(struct test_context *ctx, const char **atts)

{

	ctx->n_install_pkgs = 0;

	ctx->n_remove_pkgs = 0;

}

static void

end_transaction(struct test_context *ctx)

{

	if (ctx->n_install_pkgs) {

		ctx->system_set = razor_set_update(ctx->system_set,

						   ctx->repo_set,

						   ctx->n_install_pkgs,

						   (const char **)ctx->install_pkgs);

	}

	if (ctx->n_remove_pkgs && ctx->system_set) {

		ctx->system_set = razor_set_remove(ctx->system_set,

						   ctx->n_remove_pkgs,

						   (const char **)ctx->remove_pkgs);

	}

	while (ctx->n_install_pkgs--)

		free(ctx->install_pkgs[ctx->n_install_pkgs]);

	while (ctx->n_remove_pkgs--)

		free(ctx->remove_pkgs[ctx->n_remove_pkgs]);

}

static void

start_install_or_update(struct test_context *ctx, const char **atts)

{

	const char *name = NULL;

	get_atts(atts, "name", &name, NULL);

	if (!name) {

		fprintf(stderr, "  install/update with no name\n");

		exit(1);

	}

	ctx->install_pkgs[ctx->n_install_pkgs++] = strdup(name);

}

static void

start_remove(struct test_context *ctx, const char **atts)

{

	const char *name = NULL;

	get_atts(atts, "name", &name, NULL);

	if (!name) {

		fprintf(stderr, "  remove with no name\n");

		exit(1);

	}

	ctx->remove_pkgs[ctx->n_remove_pkgs++] = strdup(name);

}

static void

start_result(struct test_context *ctx, const char **atts)

{

	ctx->in_result = 1;

}

static void

diff_callback(const char *name,

	      const char *old_version, const char *new_version,

	      void *data)

{

	struct test_context *ctx = data;

	ctx->result_errors++;

	if (old_version) {

		fprintf(stderr, "  result set should not contain %s %s\n",

			name, old_version);

	} else {

		fprintf(stderr, "  result set should contain %s %s\n",

			name, new_version);

	}

}

static void

end_result(struct test_context *ctx)

{

	ctx->in_result = 0;

	if (ctx->result_set) {

		if (!ctx->system_set)

			ctx->system_set = razor_set_create();

		ctx->result_errors = 0;

		razor_set_diff(ctx->system_set, ctx->result_set,

			       diff_callback, ctx);

		if (ctx->result_errors)

			exit(1);

	}

}

static void

start_unsatisfiable(struct test_context *ctx, const char **atts)

{

	if (ctx->system_set) {

		fprintf(stderr, "Expected to fail, but didn't\n");

		exit(1);

	}

	/* FIXME */

	fprintf(stderr, "  Not actually checking <unsatisfiable>\n");

	ctx->in_unsatisfiable = 1;

}

static void

end_unsatisfiable(struct test_context *ctx)

{

	ctx->in_unsatisfiable = 0;

}

static void

start_test_element(void *data, const char *element, const char **atts)

{

	struct test_context *ctx = data;

	if (strcmp(element, "tests") == 0) {

		;

	} else if (strcmp(element, "test") == 0) {

		start_test(ctx, atts);

	} else if (strcmp(element, "set") == 0) {

		start_set(ctx, atts);

	} else if (strcmp(element, "transaction") == 0) {

		start_transaction(ctx, atts);

	} else if (strcmp(element, "install") == 0) {

		start_install_or_update(ctx, atts);

	} else if (strcmp(element, "install") == 0) {

		start_install_or_update(ctx, atts);

	} else if (strcmp(element, "remove") == 0) {

		start_remove(ctx, atts);

	} else if (strcmp(element, "result") == 0) {

		start_result(ctx, atts);

	} else if (strcmp(element, "unsatisfiable") == 0) {

		start_unsatisfiable(ctx, atts);

	} else if (strcmp(element, "package") == 0) {

		start_package(ctx, atts);

	} else if (strcmp(element, "requires") == 0) {

		start_property(ctx, RAZOR_PROPERTY_REQUIRES, atts);

	} else if (strcmp(element, "provides") == 0) {

		start_property(ctx, RAZOR_PROPERTY_PROVIDES, atts);

	} else if (strcmp(element, "conflicts") == 0) {

		start_property(ctx, RAZOR_PROPERTY_CONFLICTS, atts);

	} else if (strcmp(element, "obsoletes") == 0) {

		start_property(ctx, RAZOR_PROPERTY_OBSOLETES, atts);

	} else {

		fprintf(stderr, "Unrecognized element '%s'\n", element);

		exit(1);

	}

}

static void

end_test_element (void *data, const char *element)

{

	struct test_context *ctx = data;

	if (strcmp(element, "test") == 0) {

		end_test(ctx);

	} else if (strcmp(element, "set") == 0) {

		end_set(ctx);

	} else if (strcmp(element, "package") == 0) {

		end_package(ctx);

	} else if (strcmp(element, "transaction") == 0) {

		end_transaction(ctx);

	} else if (strcmp(element, "result") == 0) {

		end_result(ctx);

	} else if (strcmp(element, "unsatisfiable") == 0) {

		end_unsatisfiable(ctx);

	}

}

int main(int argc, char *argv[])

{

	struct test_context ctx;

	if (argc != 2) {

		fprintf(stderr, "usage: %s TESTS-FILE\n", argv[0]);

		exit(-1);			

	}

	memset(&ctx, 0, sizeof ctx);

	parse_xml_file(argv[1], start_test_element, end_test_element, &ctx);

	return 0;

}