#pragma once

#include <vector>
#include <string>
#include <unordered_map>

#include "util/types.hpp"
#include "util/yaml.hpp"

namespace patch_key
{
	static const std::string all = "All";
	static const std::string anchors = "Anchors";
	static const std::string author = "Author";
	static const std::string games = "Games";
	static const std::string group = "Group";
	static const std::string notes = "Notes";
	static const std::string patch = "Patch";
	static const std::string patch_version = "Patch Version";
	static const std::string version = "Version";
}

static const std::string patch_engine_version = "1.2";

enum class patch_type
{
	invalid,
	load,
	byte,
	le16,
	le32,
	le64,
	lef32,
	lef64,
	be16,
	be32,
	bd32, // be32 with data hint (non-code)
	be64,
	bd64, // be64 with data hint (non-code)
	bef32,
	bef64,
	utf8, // Text of string (not null-terminated automatically)
};

class patch_engine
{
public:
	struct patch_data
	{
		patch_type type = patch_type::load;
		u32 offset = 0;
		std::string original_value; // Used for import consistency (avoid rounding etc.)
		union
		{
			u64 long_value;
			f64 double_value;
		} value { 0 };
	};

	using patch_app_versions = std::unordered_map<std::string /*app_version*/, bool /*enabled*/>;
	using patch_serials = std::unordered_map<std::string /*serial*/, patch_app_versions>;
	using patch_titles = std::unordered_map<std::string /*serial*/, patch_serials>;

	struct patch_info
	{
		// Patch information
		std::vector<patch_data> data_list;
		patch_titles titles;
		std::string description;
		std::string patch_version;
		std::string patch_group;
		std::string author;
		std::string notes;
		std::string source_path;

		// Redundant information for accessibility (see patch_container)
		std::string hash;
		std::string version;
	};

	struct patch_container
	{
		std::unordered_map<std::string /*description*/, patch_info> patch_info_map;
		std::string hash;
		std::string version;
	};

	using patch_map = std::unordered_map<std::string /*hash*/, patch_container>;

	patch_engine();

	patch_engine(const patch_engine&) = delete;

	patch_engine& operator=(const patch_engine&) = delete;

	// Returns the directory in which patch_config.yml is located
	static std::string get_patch_config_path();

	// Returns the directory in which patches are located
	static std::string get_patches_path();

	// Returns the filepath for the imported_patch.yml
	static std::string get_imported_patch_path();

	// Load from file and append to specified patches map
	static bool load(patch_map& patches, const std::string& path, std::string content = "", bool importing = false, std::stringstream* log_messages = nullptr);

	// Read and add a patch node to the patch info
	static bool read_patch_node(patch_info& info, YAML::Node node, const YAML::Node& root, std::stringstream* log_messages = nullptr);

	// Get the patch type of a patch node
	static patch_type get_patch_type(YAML::Node node);

	// Add the data of a patch node
	static bool add_patch_data(YAML::Node node, patch_info& info, u32 modifier, const YAML::Node& root, std::stringstream* log_messages = nullptr);

	// Save to patch_config.yml
	static void save_config(const patch_map& patches_map);

	// Save a patch file
	static bool save_patches(const patch_map& patches, const std::string& path, std::stringstream* log_messages = nullptr);

	// Create or append patches to a file
	static bool import_patches(const patch_map& patches, const std::string& path, usz& count, usz& total, std::stringstream* log_messages = nullptr);

	// Remove a patch from a file
	static bool remove_patch(const patch_info& info);

	// Load patch_config.yml
	static patch_map load_config();

	// Load from file and append to member patches map
	void append_global_patches();

	// Load from title relevant files and append to member patches map
	void append_title_patches(const std::string& title_id);

	// Apply patch (returns the number of entries applied)
	std::basic_string<u32> apply(const std::string& name, u8* dst, u32 filesz = UINT32_MAX, u32 min_addr = 0);

private:
	// Database
	patch_map m_map;

	// Only one patch per patch group can be applied
	std::set<std::string> m_applied_groups;
};