#include "backend.h"
#include "ctx.h"
#include "interface.h"
#include "lex.h"
#include "line-source.h"
#include "msg.h"
#include "parse.h"

#include <fx/cmd.h>
#include <fx/io/file.h>
#include <fx/io/path.h>

#define CMD_ID 0

enum {
	ARG_SRCPATH,
	OPT_BACKEND,
	OPT_BACKEND_ARG_NAME,
};

int main(int argc, const char **argv)
{
	return fx_command_dispatch(CMD_ID, argc, argv);
}

static void print_msg(struct msg_definition *msg)
{
	printf("  msg: %s\n", msg->msg_name);

	fx_queue_entry *entry = fx_queue_first(&msg->msg_params);
	while (entry) {
		struct msg_parameter *param
			= fx_unbox(struct msg_parameter, entry, p_entry);

		printf("    param:");
		type_print(param->p_type);
		printf(" %s\n", param->p_name);

		entry = fx_queue_next(entry);
	}

	entry = fx_queue_first(&msg->msg_results);
	while (entry) {
		struct msg_parameter *param
			= fx_unbox(struct msg_parameter, entry, p_entry);

		printf("    result:");
		type_print(param->p_type);
		printf(" %s\n", param->p_name);

		entry = fx_queue_next(entry);
	}
}

static void print_interface(struct interface_definition *iface)
{
	printf("interface: %s\n", iface->if_name);
	fx_queue_entry *entry = fx_queue_first(&iface->if_msg);
	while (entry) {
		struct msg_definition *msg
			= fx_unbox(struct msg_definition, entry, msg_entry);
		print_msg(msg);
		entry = fx_queue_next(entry);
	}
}

static int xpcg(
	const fx_command *self,
	const fx_arglist *opt,
	const fx_array *args)
{
	const char *path = NULL;
	fx_arglist_get_string(opt, FX_COMMAND_INVALID_ID, ARG_SRCPATH, 0, &path);
	if (!path) {
		fx_arglist_report_missing_args(
			opt,
			FX_COMMAND_INVALID_ID,
			ARG_SRCPATH,
			0);
		return -1;
	}

	fx_file *file = NULL;
	fx_result result
		= fx_file_open(NULL, FX_RV_PATH(path), FX_FILE_READ_ONLY, &file);
	if (fx_result_is_error(result)) {
		fx_throw(result);
		return -1;
	}

	struct line_source src;
	line_source_init(&src, path, file);

	struct ctx *ctx = ctx_create();
	struct lex *lex = lex_create(&src);
#if 0
	struct token *tok = lex_peek(lex);
	while (tok) {
		printf("%s", token_type_to_string(tok->tok_type));

		switch (tok->tok_value_type) {
		case TOK_V_INT:
			printf(" %lld", tok->tok_int);
			break;
		case TOK_V_STRING:
			printf(" %s", tok->tok_str);
			break;
		case TOK_V_SYMBOL:
			printf(" %s", token_symbol_to_string(tok->tok_sym));
			break;
		case TOK_V_KEYWORD:
			printf(" %s", token_keyword_to_string(tok->tok_kw));
			break;
		default:
			break;
		}

		printf("\n");
		lex_advance(lex);
		tok = lex_peek(lex);
	}
#endif

	struct interface_definition *iface
		= parse_interface_definition(ctx, lex);
	if (!iface) {
		return -1;
	}

	const struct backend *backend = c_mpc_backend();
	int err = backend->b_emit(iface);

	return err;
}

FX_COMMAND(CMD_ID, FX_COMMAND_INVALID_ID)
{
	FX_COMMAND_NAME("xpcg");
	FX_COMMAND_DESC("xpc interface generator.");
	FX_COMMAND_FLAGS(FX_COMMAND_SHOW_HELP_BY_DEFAULT);
	FX_COMMAND_FUNCTION(xpcg);
	FX_COMMAND_HELP_OPTION();

	FX_COMMAND_ARG(ARG_SRCPATH)
	{
		FX_ARG_NAME("source-file");
		FX_ARG_DESC("the interface file to compile.");
		FX_ARG_NR_VALUES(1);
	}

	FX_COMMAND_OPTION(OPT_BACKEND)
	{
		FX_OPTION_LONG_NAME("backend");
		FX_OPTION_SHORT_NAME('b');
		FX_OPTION_DESC("which backend to use.");
		FX_OPTION_ARG(OPT_BACKEND_ARG_NAME)
		{
			FX_ARG_NAME("backend-name");
			FX_ARG_NR_VALUES(1);
			FX_ARG_ALLOWED_VALUES("c-mpc");
		}
	}

	FX_COMMAND_USAGE()
	{
		FX_COMMAND_USAGE_ARG(ARG_SRCPATH);
		FX_COMMAND_USAGE_OPT(OPT_BACKEND);
	}
}