/*************************************************************************/
/*  gdscript_warning.cpp                                                 */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "gdscript_warning.h"

#include "core/variant.h"

#ifdef DEBUG_ENABLED

String GDScriptWarning::get_message() const {
#define CHECK_SYMBOLS(m_amount) ERR_FAIL_COND_V(symbols.size() < m_amount, String());

	switch (code) {
		case UNASSIGNED_VARIABLE_OP_ASSIGN: {
			CHECK_SYMBOLS(1);
			return "Using assignment with operation but the variable '" + symbols[0] + "' was not previously assigned a value.";
		} break;
		case UNASSIGNED_VARIABLE: {
			CHECK_SYMBOLS(1);
			return "The variable '" + symbols[0] + "' was used but never assigned a value.";
		} break;
		case UNUSED_VARIABLE: {
			CHECK_SYMBOLS(1);
			return "The local variable '" + symbols[0] + "' is declared but never used in the block. If this is intended, prefix it with an underscore: '_" + symbols[0] + "'";
		} break;
		case UNUSED_LOCAL_CONSTANT: {
			CHECK_SYMBOLS(1);
			return "The local constant '" + symbols[0] + "' is declared but never used in the block. If this is intended, prefix it with an underscore: '_" + symbols[0] + "'";
		} break;
		case SHADOWED_VARIABLE: {
			CHECK_SYMBOLS(4);
			return vformat(R"(The local %s "%s" is shadowing an already-declared %s at line %s.)", symbols[0], symbols[1], symbols[2], symbols[3]);
		} break;
		case SHADOWED_VARIABLE_BASE_CLASS: {
			CHECK_SYMBOLS(4);
			return vformat(R"(The local %s "%s" is shadowing an already-declared %s at the base class "%s".)", symbols[0], symbols[1], symbols[2], symbols[3]);
		} break;
		case UNUSED_PRIVATE_CLASS_VARIABLE: {
			CHECK_SYMBOLS(1);
			return "The class variable '" + symbols[0] + "' is declared but never used in the script.";
		} break;
		case UNUSED_PARAMETER: {
			CHECK_SYMBOLS(2);
			return "The parameter '" + symbols[1] + "' is never used in the function '" + symbols[0] + "'. If this is intended, prefix it with an underscore: '_" + symbols[1] + "'";
		} break;
		case UNREACHABLE_CODE: {
			CHECK_SYMBOLS(1);
			return "Unreachable code (statement after return) in function '" + symbols[0] + "()'.";
		} break;
		case UNREACHABLE_PATTERN: {
			return "Unreachable pattern (pattern after wildcard or bind).";
		} break;
		case STANDALONE_EXPRESSION: {
			return "Standalone expression (the line has no effect).";
		} break;
		case VOID_ASSIGNMENT: {
			CHECK_SYMBOLS(1);
			return "Assignment operation, but the function '" + symbols[0] + "()' returns void.";
		} break;
		case NARROWING_CONVERSION: {
			return "Narrowing conversion (float is converted to int and loses precision).";
		} break;
		case INCOMPATIBLE_TERNARY: {
			return "Values of the ternary conditional are not mutually compatible.";
		} break;
		case UNUSED_SIGNAL: {
			CHECK_SYMBOLS(1);
			return "The signal '" + symbols[0] + "' is declared but never emitted.";
		} break;
		case RETURN_VALUE_DISCARDED: {
			CHECK_SYMBOLS(1);
			return "The function '" + symbols[0] + "()' returns a value, but this value is never used.";
		} break;
		case PROPERTY_USED_AS_FUNCTION: {
			CHECK_SYMBOLS(2);
			return "The method '" + symbols[0] + "()' was not found in base '" + symbols[1] + "' but there's a property with the same name. Did you mean to access it?";
		} break;
		case CONSTANT_USED_AS_FUNCTION: {
			CHECK_SYMBOLS(2);
			return "The method '" + symbols[0] + "()' was not found in base '" + symbols[1] + "' but there's a constant with the same name. Did you mean to access it?";
		} break;
		case FUNCTION_USED_AS_PROPERTY: {
			CHECK_SYMBOLS(2);
			return "The property '" + symbols[0] + "' was not found in base '" + symbols[1] + "' but there's a method with the same name. Did you mean to call it?";
		} break;
		case INTEGER_DIVISION: {
			return "Integer division, decimal part will be discarded.";
		} break;
		case UNSAFE_PROPERTY_ACCESS: {
			CHECK_SYMBOLS(2);
			return "The property '" + symbols[0] + "' is not present on the inferred type '" + symbols[1] + "' (but may be present on a subtype).";
		} break;
		case UNSAFE_METHOD_ACCESS: {
			CHECK_SYMBOLS(2);
			return "The method '" + symbols[0] + "' is not present on the inferred type '" + symbols[1] + "' (but may be present on a subtype).";
		} break;
		case UNSAFE_CAST: {
			CHECK_SYMBOLS(1);
			return "The value is cast to '" + symbols[0] + "' but has an unknown type.";
		} break;
		case UNSAFE_CALL_ARGUMENT: {
			CHECK_SYMBOLS(4);
			return "The argument '" + symbols[0] + "' of the function '" + symbols[1] + "' requires a the subtype '" + symbols[2] + "' but the supertype '" + symbols[3] + "' was provided";
		} break;
		case DEPRECATED_KEYWORD: {
			CHECK_SYMBOLS(2);
			return "The '" + symbols[0] + "' keyword is deprecated and will be removed in a future release, please replace its uses by '" + symbols[1] + "'.";
		} break;
		case STANDALONE_TERNARY: {
			return "Standalone ternary conditional operator: the return value is being discarded.";
		}
		case ASSERT_ALWAYS_TRUE: {
			return "Assert statement is redundant because the expression is always true.";
		}
		case ASSERT_ALWAYS_FALSE: {
			return "Assert statement will raise an error because the expression is always false.";
		}
		case REDUNDANT_AWAIT: {
			return R"("await" keyword not needed in this case, because the expression isn't a coroutine nor a signal.)";
		}
		case WARNING_MAX:
			break; // Can't happen, but silences warning
	}
	ERR_FAIL_V_MSG(String(), "Invalid GDScript warning code: " + get_name_from_code(code) + ".");

#undef CHECK_SYMBOLS
}

String GDScriptWarning::get_name() const {
	return get_name_from_code(code);
}

String GDScriptWarning::get_name_from_code(Code p_code) {
	ERR_FAIL_COND_V(p_code < 0 || p_code >= WARNING_MAX, String());

	static const char *names[] = {
		"UNASSIGNED_VARIABLE",
		"UNASSIGNED_VARIABLE_OP_ASSIGN",
		"UNUSED_VARIABLE",
		"UNUSED_LOCAL_CONSTANT",
		"SHADOWED_VARIABLE",
		"SHADOWED_VARIABLE_BASE_CLASS",
		"UNUSED_PRIVATE_CLASS_VARIABLE",
		"UNUSED_PARAMETER",
		"UNREACHABLE_CODE",
		"UNREACHABLE_PATTERN",
		"STANDALONE_EXPRESSION",
		"VOID_ASSIGNMENT",
		"NARROWING_CONVERSION",
		"INCOMPATIBLE_TERNARY",
		"UNUSED_SIGNAL",
		"RETURN_VALUE_DISCARDED",
		"PROPERTY_USED_AS_FUNCTION",
		"CONSTANT_USED_AS_FUNCTION",
		"FUNCTION_USED_AS_PROPERTY",
		"INTEGER_DIVISION",
		"UNSAFE_PROPERTY_ACCESS",
		"UNSAFE_METHOD_ACCESS",
		"UNSAFE_CAST",
		"UNSAFE_CALL_ARGUMENT",
		"DEPRECATED_KEYWORD",
		"STANDALONE_TERNARY",
		"ASSERT_ALWAYS_TRUE",
		"ASSERT_ALWAYS_FALSE",
		"REDUNDANT_AWAIT",
	};

	static_assert((sizeof(names) / sizeof(*names)) == WARNING_MAX, "Amount of warning types don't match the amount of warning names.");

	return names[(int)p_code];
}

GDScriptWarning::Code GDScriptWarning::get_code_from_name(const String &p_name) {
	for (int i = 0; i < WARNING_MAX; i++) {
		if (get_name_from_code((Code)i) == p_name) {
			return (Code)i;
		}
	}

	ERR_FAIL_V_MSG(WARNING_MAX, "Invalid GDScript warning name: " + p_name);
}

#endif // DEBUG_ENABLED
