#pragma once

#include <cstdint>
#include <unordered_map>

#include "Core/ConfigValues.h"

class Path;
class Section;  // ini file section
struct UrlEncoder;

enum class CfgFlag : u8 {
	DEFAULT = 0,
	DONT_SAVE = 1,  // normally don't like negative flags, but these are really not many.
	PER_GAME = 2,
	REPORT = 4,
};
ENUM_CLASS_BITOPS(CfgFlag);

struct ConfigBlock;

struct ConfigSetting {
	enum class Type {
		TYPE_TERMINATOR,
		TYPE_BOOL,
		TYPE_INT,
		TYPE_UINT32,
		TYPE_UINT64,
		TYPE_FLOAT,
		TYPE_STRING,
		TYPE_STRING_VECTOR,
		TYPE_TOUCH_POS,
		TYPE_PATH,
		TYPE_CUSTOM_BUTTON
	};
	union DefaultValue {
		bool b;
		int i;
		uint32_t u;
		uint64_t lu;
		float f;
		const char *s;
		const char *p;  // not sure how much point..
		const std::vector<std::string_view> *v;
		ConfigTouchPos touchPos;
		ConfigCustomButton customButton;
	};

	typedef bool (*BoolDefaultCallback)();
	typedef int (*IntDefaultCallback)();
	typedef uint32_t (*Uint32DefaultCallback)();
	typedef uint64_t (*Uint64DefaultCallback)();
	typedef float (*FloatDefaultCallback)();
	typedef std::string (*StringDefaultCallback)();
	typedef ConfigTouchPos (*TouchPosDefaultCallback)();
	typedef Path (*PathDefaultCallback)();
	typedef ConfigCustomButton (*CustomButtonDefaultCallback)();

	union DefaultCallback {
		BoolDefaultCallback b;
		IntDefaultCallback i;
		Uint32DefaultCallback u;
		Uint64DefaultCallback lu;
		FloatDefaultCallback f;
		StringDefaultCallback s;
		PathDefaultCallback p;
		TouchPosDefaultCallback touchPos;
		CustomButtonDefaultCallback customButton;
	};

	// The configBlock you pass in here is just to be able to calculate the offset of the setting within the block so it can be
	// applied to other blocks.
	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, bool *v, bool def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_BOOL), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.b = nullptr;
		default_.b = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, bool *v, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_BOOL), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.b = nullptr;
		default_.b = false;  // unused with this constructor
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, int *v, int def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_INT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.i = nullptr;
		default_.i = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, int *v, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_INT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.i = nullptr;
		default_.i = 0;  // unused with this constructor
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, int *v, int def, std::string (*transTo)(int), int (*transFrom)(const std::string &), CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_INT), flags_(flags), translateTo_(transTo), translateFrom_(transFrom), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.i = nullptr;
		default_.i = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, uint32_t *v, uint32_t def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_UINT32), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.u = nullptr;
		default_.u = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, uint64_t *v, uint64_t def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_UINT64), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.lu = nullptr;
		default_.lu = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, float *v, float def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_FLOAT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.f = nullptr;
		default_.f = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, float *v, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_FLOAT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.f = nullptr;
		default_.f = 0.0f;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, std::string *v, const char *def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_STRING), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.s = nullptr;
		default_.s = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, std::vector<std::string> *v, const std::vector<std::string_view> *def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_STRING_VECTOR), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		default_.v = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, Path *v, const char *def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_PATH), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.p = nullptr;
		default_.p = def;
	}

	ConfigSetting(const char *iniX, const char *iniY, const char *iniScale, const char *iniShow, ConfigBlock *configBlock, ConfigTouchPos *v, ConfigTouchPos def, CfgFlag flags) noexcept
		: iniKey_(iniX), ini2_(iniY), ini3_(iniScale), ini4_(iniShow), type_(Type::TYPE_TOUCH_POS), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.touchPos = nullptr;
		default_.touchPos = def;
	}

	ConfigSetting(const char *iniKey, const char *iniImage, const char *iniShape, const char *iniToggle, const char *iniRepeat, ConfigBlock *configBlock, ConfigCustomButton *v, ConfigCustomButton def, CfgFlag flags) noexcept
		: iniKey_(iniKey), ini2_(iniImage), ini3_(iniShape), ini4_(iniToggle), ini5_(iniRepeat), type_(Type::TYPE_CUSTOM_BUTTON), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.customButton = nullptr;
		default_.customButton = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, bool *v, BoolDefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_BOOL), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.b = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, int *v, IntDefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_INT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.i = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, int *v, IntDefaultCallback def, std::string(*transTo)(int), int(*transFrom)(const std::string &), CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_INT), flags_(flags), offset_((const char *)v - (const char *)configBlock), translateTo_(transTo), translateFrom_(transFrom) {
		defaultCallback_.i = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, uint32_t *v, Uint32DefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_UINT32), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.u = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, float *v, FloatDefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_FLOAT), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.f = def;
	}

	ConfigSetting(std::string_view ini, ConfigBlock *configBlock, std::string *v, StringDefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(ini), type_(Type::TYPE_STRING), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.s = def;
	}

	ConfigSetting(std::string_view iniX, const char *iniY, const char *iniScale, const char *iniShow, ConfigBlock *configBlock, ConfigTouchPos *v, TouchPosDefaultCallback def, CfgFlag flags) noexcept
		: iniKey_(iniX), ini2_(iniY), ini3_(iniScale), ini4_(iniShow), type_(Type::TYPE_TOUCH_POS), flags_(flags), offset_((const char *)v - (const char *)configBlock) {
		defaultCallback_.touchPos = def;
	}

	bool ReadFromIniSection(ConfigBlock *configBlock, const Section *section, bool applyDefaultIfMissing) const;

	void CopyFromBlock(const ConfigBlock *other);

	// Yes, this can be const because what's modified is not the ConfigSetting struct, but the value which is stored elsewhere.
	// Should actually be called WriteToIni or something.
	void WriteToIniSection(const ConfigBlock *configBlock, Section *section) const;

	// If log is true, logs if the setting changed.
	bool RestoreToDefault(ConfigBlock *configBlock, bool log) const;

	void ReportSetting(const ConfigBlock *configBlock, UrlEncoder &data, const std::string &prefix) const;

	// Easy flag accessors.
	CfgFlag Flags() const { return flags_; }
	bool PerGame() const { return flags_ & CfgFlag::PER_GAME; }
	bool SaveSetting() const { return !(flags_ & CfgFlag::DONT_SAVE); }
	bool Report() const { return flags_ & CfgFlag::REPORT; }

	int GetDefaultInt() const {
		_dbg_assert_(type_ == Type::TYPE_INT);
		return defaultCallback_.i ? defaultCallback_.i() : default_.i;
	}

	std::string_view IniKey() const {
		return iniKey_;
	}

	const char *ini2_ = nullptr;
	const char *ini3_ = nullptr;
	const char *ini4_ = nullptr;
	const char *ini5_ = nullptr;

	const Type type_;

	// Returns false if per-game settings are not currently used
	static bool PerGame(void *ptr);

	const void *GetVoidPtr(ConfigBlock *configBlock) const {
		char *configBlockBase = (char *)configBlock;
		return (const void *)(configBlockBase + offset_);
	}

private:
	std::string_view iniKey_;
	CfgFlag flags_;
	DefaultValue default_{};
	DefaultCallback defaultCallback_{};
	u32 offset_;

	// We only support transform for ints.
	std::string (*translateTo_)(int) = nullptr;
	int (*translateFrom_)(const std::string &) = nullptr;
};