#include "test.h"
#include "token.h"

static void test_tokenstream_open_fail(void) {
	TokenStream* ts = tokenstream_open(NULL);
	if (ts != NULL) fail("expected NULL for NULL buffer");
}

static void test_tokenstream_simple_keyword(void) {
	Buffer* buf = buffer_open_string("module");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	Token t = tokenstream_next(ts);
	if (t != TOKEN_MODULE) fail("expected TOKEN_MODULE");

	Token eof = tokenstream_next(ts);
	if (eof != -1) fail("expected EOF");

	tokenstream_close(ts);
}

static void test_tokenstream_keywords_and_symbols(void) {
	Buffer* buf = buffer_open_string("module main; import stdio;");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	if (tokenstream_next(ts) != TOKEN_MODULE) fail("expected TOKEN_MODULE");
	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected TOKEN_IDENTIFIER (main)");
	if (tokenstream_next(ts) != TOKEN_SEMICOLON) fail("expected TOKEN_SEMICOLON");
	if (tokenstream_next(ts) != TOKEN_IMPORT) fail("expected TOKEN_IMPORT");
	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected TOKEN_IDENTIFIER (stdio)");
	if (tokenstream_next(ts) != TOKEN_SEMICOLON) fail("expected TOKEN_SEMICOLON");
	if (tokenstream_next(ts) != -1) fail("expected EOF");

	tokenstream_close(ts);
}

static void test_tokenstream_parentheses_and_brackets(void) {
	Buffer* buf = buffer_open_string("()[]");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	if (tokenstream_next(ts) != TOKEN_PARENT_OPEN) fail("expected TOKEN_PARENT_OPEN");
	if (tokenstream_next(ts) != TOKEN_PARENT_CLOSE) fail("expected TOKEN_PARENT_CLOSE");
	if (tokenstream_next(ts) != TOKEN_BRACKET_OPEN) fail("expected TOKEN_BRACKET_OPEN");
	if (tokenstream_next(ts) != TOKEN_BRACKET_CLOSE) fail("expected TOKEN_BRACKET_CLOSE");
	if (tokenstream_next(ts) != -1) fail("expected EOF");

	tokenstream_close(ts);
}

static void test_tokenstream_comma(void) {
	Buffer* buf = buffer_open_string("a,b,c");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected a");
	if (tokenstream_next(ts) != TOKEN_COMMA) fail("expected comma");
	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected b");
	if (tokenstream_next(ts) != TOKEN_COMMA) fail("expected comma");
	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected c");
	if (tokenstream_next(ts) != -1) fail("expected EOF");

	tokenstream_close(ts);
}

static void test_tokenstream_whitespace_ignored(void) {
	Buffer* buf = buffer_open_string("  module  \n\t import  ;  ");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	if (tokenstream_next(ts) != TOKEN_MODULE) fail("expected TOKEN_MODULE");
	if (tokenstream_next(ts) != TOKEN_IMPORT) fail("expected TOKEN_IMPORT");
	if (tokenstream_next(ts) != TOKEN_SEMICOLON) fail("expected TOKEN_SEMICOLON");
	if (tokenstream_next(ts) != -1) fail("expected EOF");

	tokenstream_close(ts);
}

static void test_tokenstream_void_function_signature(void) {
	Buffer* buf = buffer_open_string("void main()");
	if (buf == NULL) fail("could not create buffer");

	TokenStream* ts = tokenstream_open(buf);
	if (ts == NULL) fail("could not create tokenstream");

	if (tokenstream_next(ts) != TOKEN_VOID) fail("expected TOKEN_VOID");
	if (tokenstream_next(ts) != TOKEN_IDENTIFIER) fail("expected TOKEN_IDENTIFIER");
	if (tokenstream_next(ts) != TOKEN_PARENT_OPEN) fail("expected TOKEN_PARENT_OPEN");
	if (tokenstream_next(ts) != TOKEN_PARENT_CLOSE) fail("expected TOKEN_PARENT_CLOSE");
	if (tokenstream_next(ts) != -1) fail("expected EOF");

	tokenstream_close(ts);
}