/*************************************************************************/
/*  shader_warnings.cpp                                                  */
/*************************************************************************/
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/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2021 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2021 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "shader_warnings.h"
#include "core/variant/variant.h"

#ifdef DEBUG_ENABLED

ShaderWarning::Code ShaderWarning::get_code() const {
	return code;
}

int ShaderWarning::get_line() const {
	return line;
}

const StringName &ShaderWarning::get_subject() const {
	return subject;
}

String ShaderWarning::get_message() const {
	switch (code) {
		case FLOAT_COMPARISON:
			return vformat("Direct floating-point comparison (this may not evaluate to `true` as you expect). Instead, use `abs(a - b) < 0.0001` for an approximate but predictable comparison.");
		case UNUSED_CONSTANT:
			return vformat("The const '%s' is declared but never used.", subject);
		case UNUSED_FUNCTION:
			return vformat("The function '%s' is declared but never used.", subject);
		case UNUSED_STRUCT:
			return vformat("The struct '%s' is declared but never used.", subject);
		case UNUSED_UNIFORM:
			return vformat("The uniform '%s' is declared but never used.", subject);
		case UNUSED_VARYING:
			return vformat("The varying '%s' is declared but never used.", subject);
		case UNUSED_LOCAL_VARIABLE:
			return vformat("The local variable '%s' is declared but never used.", subject);
		case FORMATTING_ERROR:
			return subject;
		case DEVICE_LIMIT_EXCEEDED:
			return vformat("The total size of the %s for this shader on this device has been exceeded (%s/%s). The shader may not work correctly.", subject, (int)extra_args[0], (int)extra_args[1]);
		default:
			break;
	}
	return String();
}

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

Vector<Variant> ShaderWarning::get_extra_args() const {
	return extra_args;
}

String ShaderWarning::get_name_from_code(Code p_code) {
	ERR_FAIL_INDEX_V(p_code, WARNING_MAX, String());

	static const char *names[] = {
		"FLOAT_COMPARISON",
		"UNUSED_CONSTANT",
		"UNUSED_FUNCTION",
		"UNUSED_STRUCT",
		"UNUSED_UNIFORM",
		"UNUSED_VARYING",
		"UNUSED_LOCAL_VARIABLE",
		"FORMATTING_ERROR",
		"DEVICE_LIMIT_EXCEEDED",
	};

	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];
}

ShaderWarning::Code ShaderWarning::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 shader warning name: " + p_name);
}

static Map<int, uint32_t> *code_to_flags_map = nullptr;

static void init_code_to_flags_map() {
	code_to_flags_map = memnew((Map<int, uint32_t>));
	code_to_flags_map->insert(ShaderWarning::FLOAT_COMPARISON, ShaderWarning::FLOAT_COMPARISON_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_CONSTANT, ShaderWarning::UNUSED_CONSTANT_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_FUNCTION, ShaderWarning::UNUSED_FUNCTION_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_STRUCT, ShaderWarning::UNUSED_STRUCT_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_UNIFORM, ShaderWarning::UNUSED_UNIFORM_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_VARYING, ShaderWarning::UNUSED_VARYING_FLAG);
	code_to_flags_map->insert(ShaderWarning::UNUSED_LOCAL_VARIABLE, ShaderWarning::UNUSED_LOCAL_VARIABLE_FLAG);
	code_to_flags_map->insert(ShaderWarning::FORMATTING_ERROR, ShaderWarning::FORMATTING_ERROR_FLAG);
	code_to_flags_map->insert(ShaderWarning::DEVICE_LIMIT_EXCEEDED, ShaderWarning::DEVICE_LIMIT_EXCEEDED_FLAG);
}

ShaderWarning::CodeFlags ShaderWarning::get_flags_from_codemap(const Map<Code, bool> &p_map) {
	uint32_t result = 0U;

	if (code_to_flags_map == nullptr) {
		init_code_to_flags_map();
	}

	for (const KeyValue<Code, bool> &E : p_map) {
		if (E.value) {
			ERR_FAIL_COND_V(!code_to_flags_map->has((int)E.key), ShaderWarning::NONE_FLAG);
			result |= (*code_to_flags_map)[(int)E.key];
		}
	}
	return (CodeFlags)result;
}

ShaderWarning::ShaderWarning(Code p_code, int p_line, const StringName &p_subject, const Vector<Variant> &p_extra_args) :
		code(p_code), line(p_line), subject(p_subject), extra_args(p_extra_args) {
}

#endif // DEBUG_ENABLED