#include "NodeTools.hpp"

using namespace OpenVic;
using namespace OpenVic::NodeTools;

template<typename T>
static node_callback_t _expect_type(callback_t<T const&> callback) {
	return [callback](ast::NodeCPtr node) -> bool {
		if (node != nullptr) {
			T const* cast_node = node->cast_to<T>();
			if (cast_node != nullptr) {
				return callback(*cast_node);
			}
			Logger::error("Invalid node type ", node->get_type(), " when expecting ", T::get_type_static());
		} else {
			Logger::error("Null node when expecting ", T::get_type_static());
		}
		return false;
	};
}

template<typename T>
requires(std::derived_from<T, ast::AbstractStringNode>)
static callback_t<T const&> _abstract_string_node_callback(callback_t<std::string_view> callback) {
	return [callback](T const& node) -> bool {
		return callback(node._name);
	};
}

node_callback_t NodeTools::expect_identifier(callback_t<std::string_view> callback) {
	return _expect_type<ast::IdentifierNode>(_abstract_string_node_callback<ast::IdentifierNode>(callback));
}

node_callback_t NodeTools::expect_string(callback_t<std::string_view> callback) {
	return _expect_type<ast::StringNode>(_abstract_string_node_callback<ast::StringNode>(callback));
}

node_callback_t NodeTools::expect_identifier_or_string(callback_t<std::string_view> callback) {
	return [callback](ast::NodeCPtr node) -> bool {
		if (node != nullptr) {
			ast::AbstractStringNode const* cast_node = node->cast_to<ast::IdentifierNode>();
			if (cast_node == nullptr) {
				cast_node = node->cast_to<ast::StringNode>();
			}
			if (cast_node != nullptr) {
				return _abstract_string_node_callback<ast::AbstractStringNode>(callback)(*cast_node);
			}
			Logger::error("Invalid node type ", node->get_type(), " when expecting ", ast::IdentifierNode::get_type_static(), " or ", ast::StringNode::get_type_static());
		} else {
			Logger::error("Null node when expecting ", ast::IdentifierNode::get_type_static(), " or ", ast::StringNode::get_type_static());
		}
		return false;
	};
}

node_callback_t NodeTools::expect_bool(callback_t<bool> callback) {
	return expect_identifier(
		[callback](std::string_view identifier) -> bool {
			if (identifier == "yes") {
				return callback(true);
			} else if (identifier == "no") {
				return callback(false);
			}
			Logger::error("Invalid bool identifier text: ", identifier);
			return false;
		}
	);
}

node_callback_t NodeTools::expect_int(callback_t<int64_t> callback) {
	return expect_identifier(
		[callback](std::string_view identifier) -> bool {
			bool successful = false;
			const int64_t val = StringUtils::string_to_int64(identifier, &successful, 10);
			if (successful) {
				return callback(val);
			}
			Logger::error("Invalid int identifier text: ", identifier);
			return false;
		}
	);
}

node_callback_t NodeTools::expect_uint(callback_t<uint64_t> callback) {
	return expect_identifier(
		[callback](std::string_view identifier) -> bool {
			bool successful = false;
			const uint64_t val = StringUtils::string_to_uint64(identifier, &successful, 10);
			if (successful) {
				return callback(val);
			}
			Logger::error("Invalid uint identifier text: ", identifier);
			return false;
		}
	);
}

node_callback_t NodeTools::expect_fixed_point(callback_t<fixed_point_t> callback) {
	return expect_identifier(
		[callback](std::string_view identifier) -> bool {
			bool successful = false;
			const fixed_point_t val = fixed_point_t::parse(identifier.data(), identifier.length(), &successful);
			if (successful) {
				return callback(val);
			}
			Logger::error("Invalid fixed point identifier text: ", identifier);
			return false;
		}
	);
}

node_callback_t NodeTools::expect_colour(callback_t<colour_t> callback) {
	return [callback](ast::NodeCPtr node) -> bool {
		colour_t col = NULL_COLOUR;
		uint32_t components = 0;
		bool ret = expect_list_of_length(3,
			expect_fixed_point(
				[&col, &components](fixed_point_t val) -> bool {
					components++;
					col <<= 8;
					if (val < 0 || val > 255) {
						Logger::error("Invalid colour component: ", val);
						return false;
					} else {
						if (val <= 1) val *= 255;
						col |= val.to_int32_t();
						return true;
					}
				}
			)
		)(node);
		ret &= callback(col << 8 * (3 - components));
		return ret;
	};
}

node_callback_t NodeTools::expect_date(callback_t<Date> callback) {
	return expect_identifier(
		[callback](std::string_view identifier) -> bool {
			bool successful = false;
			const Date date = Date::from_string(identifier, &successful);
			if (successful) {
				return callback(date);
			}
			Logger::error("Invalid date identifier text: ", identifier);
			return false;
		}
	);
}

template<typename T, node_callback_t (*expect_func)(callback_t<T>)>
node_callback_t _expect_vec2(callback_t<vec2_t<T>> callback) {
	return [callback](ast::NodeCPtr node) -> bool {
		vec2_t<T> vec;
		bool ret = expect_dictionary_keys(
			"x", ONE_EXACTLY, expect_func(assign_variable_callback(vec.x)),
			"y", ONE_EXACTLY, expect_func(assign_variable_callback(vec.y))
		)(node);
		ret &= callback(vec);
		return ret;
	};
}

node_callback_t NodeTools::expect_ivec2(callback_t<ivec2_t> callback) {
	return _expect_vec2<int64_t, expect_int>(callback);
}

node_callback_t NodeTools::expect_fvec2(callback_t<fvec2_t> callback) {
	return _expect_vec2<fixed_point_t, expect_fixed_point>(callback);
}

node_callback_t NodeTools::expect_assign(key_value_callback_t callback) {
	return _expect_type<ast::AssignNode>(
		[callback](ast::AssignNode const& assign_node) -> bool {
			return callback(assign_node._name, assign_node._initializer.get());
		}
	);
}

node_callback_t NodeTools::expect_list_and_length(length_callback_t length_callback, node_callback_t callback) {
	return _expect_type<ast::AbstractListNode>(
		[length_callback, callback](ast::AbstractListNode const& list_node) -> bool {
			std::vector<ast::NodeUPtr> const& list = list_node._statements;
			bool ret = true;
			size_t size = length_callback(list.size());
			if (size > list.size()) {
				Logger::error("Trying to read more values than the list contains: ", size, " > ", list.size());
				size = list.size();
				ret = false;
			}
			std::for_each(list.begin(), list.begin() + size,
				[callback, &ret](ast::NodeUPtr const& sub_node) -> void {
					ret &= callback(sub_node.get());
				}
			);
			return ret;
		}
	);
}

node_callback_t NodeTools::expect_list_of_length(size_t length, node_callback_t callback) {
	return [length, callback](ast::NodeCPtr node) -> bool {
		bool ret = true;
		ret &= expect_list_and_length(
			[length, &ret](size_t size) -> size_t {
				if (size != length) {
					Logger::error("List length ", size, " does not match expected length ", length);
					ret = false;
					if (length < size) return length;
				}
				return size;
			},
			callback
		)(node);
		return ret;
	};
}

node_callback_t NodeTools::expect_list(node_callback_t callback) {
	return expect_list_and_length(default_length_callback, callback);
}

node_callback_t NodeTools::expect_dictionary_and_length(length_callback_t length_callback, key_value_callback_t callback) {
	return expect_list_and_length(length_callback, expect_assign(callback));
}

node_callback_t NodeTools::expect_dictionary(key_value_callback_t callback) {
	return expect_dictionary_and_length(default_length_callback, callback);
}

node_callback_t NodeTools::_expect_dictionary_keys_and_length(length_callback_t length_callback, bool allow_other_keys, key_map_t&& key_map) {
	return [length_callback, allow_other_keys, key_map = std::move(key_map)](ast::NodeCPtr node) mutable -> bool {
		bool ret = expect_dictionary_and_length(
			length_callback,
			[&key_map, allow_other_keys](std::string_view key, ast::NodeCPtr value) -> bool {
				const key_map_t::iterator it = key_map.find(key);
				if (it == key_map.end()) {
					if (allow_other_keys) return true;
					Logger::error("Invalid dictionary key: ", key);
					return false;
				}
				dictionary_entry_t& entry = it->second;
				if (++entry.count > 1 && !entry.can_repeat()) {
					Logger::error("Invalid repeat of dictionary key: ", key);
					return false;
				}
				return entry.callback(value);
			}
		)(node);
		for (key_map_t::value_type const& key_entry : key_map) {
			dictionary_entry_t const& entry = key_entry.second;
			if (entry.must_appear() && entry.count < 1) {
				Logger::error("Mandatory dictionary key not present: ", key_entry.first);
				ret = false;
			}
		}
		return ret;
	};
}

node_callback_t NodeTools::name_list_callback(std::vector<std::string>& list) {
	return expect_list_reserve_length(
		list,
		expect_identifier_or_string(
			[&list](std::string_view str) -> bool {
				if (!str.empty()) {
					list.push_back(std::string { str });
					return true;
				}
				Logger::error("Empty identifier or string");
				return false;
			}
		)
	);
}