#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);

	fd = open(filename, O_RDONLY);

	if (fd < 0) {

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

		exit(-1);

	}

	while (1) {

		buffer = XML_GetBuffer(parser, XML_BUFFER_SIZE);

		len = read(fd, buffer, XML_BUFFER_SIZE);

		if (len == 0)

			break;

		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;

	struct razor_transaction *trans;

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

	int n_install_pkgs, n_remove_pkgs;

	int unsat;

	int in_result;

	int debug, errors;

};

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;

	}

	if (ctx->trans) {

		razor_transaction_destroy(ctx->trans);

		ctx->trans = 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

add_property(struct test_context *ctx, enum razor_property_type type, const char *name, enum razor_version_relation rel, const char *version)

{

	razor_importer_add_property(ctx->importer, name,

				    rel, version, type);

}

static void

check_unsatisfiable_property(struct test_context *ctx,

			     enum razor_property_type type,

			     const char *name,

			     enum razor_version_relation rel,

			     const char *version)

{

	if (!version)

		version = "";

	if (razor_transaction_unsatisfied_property(ctx->trans,

						   name, rel, version))

		return;

	fprintf(stderr, "  didn't get unsatisfiable '%s %s %s'\n",

		name, razor_version_relations[rel], version);

	ctx->errors++;

}

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;

	get_atts(atts, "name", &name, "relation", &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;

	if (ctx->unsat)

		check_unsatisfiable_property(ctx, type, name, rel, version);

	else

		add_property(ctx, type, name, rel, version);

}

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)

{

	int errors;

	ctx->trans = razor_transaction_create(ctx->system_set, ctx->repo_set,

					      ctx->n_install_pkgs,

					      (const char **)ctx->install_pkgs,

					      ctx->n_remove_pkgs,

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

	errors = razor_transaction_describe(ctx->trans);

	printf("\n");

	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]);

	if (!errors) {

		struct razor_set *new;

		new = razor_transaction_run(ctx->trans);

		razor_set_destroy(ctx->system_set);

		ctx->system_set = new;

	}

}

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->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();

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

			       diff_callback, ctx);

	}

}

static void

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

{

	if (ctx->result_set) {

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

		exit(1);

	}

	ctx->unsat = 1;

}

static void

end_unsatisfiable(struct test_context *ctx)

{

	ctx->unsat = 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;

	const char *test_file;

	memset(&ctx, 0, sizeof ctx);

	if (argc > 3) {

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

		exit(-1);			

	}

	if (argc >= 2 && !strcmp (argv[1], "-d")) {

		ctx.debug = 1;

		argc--;

		argv++;

	}

	if (argc == 2)

		test_file = argv[1];

	else

		test_file = "test.xml";

	parse_xml_file(test_file, start_test_element, end_test_element, &ctx);

	if (ctx.errors) {

		fprintf(stderr, "\n%d errors\n", ctx.errors);

		return 1;

	} else

		return 0;

}