// Copyright (c) 2012- PPSSPP Project.

// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 2.0 or later versions.

// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License 2.0 for more details.

// A copy of the GPL 2.0 should have been included with the program.
// If not, see http://www.gnu.org/licenses/

// Official git repository and contact information can be found at
// https://github.com/hrydgard/ppsspp and http://www.ppsspp.org/.

#pragma once

#include <mutex>
#include <string>

#include "Core/Dialog/PSPDialog.h"
#include "Core/MemMap.h"
#include "Common/CommonTypes.h"


/**
* Enumeration for input language
*/
enum SceUtilityOskInputLanguage
{
	PSP_UTILITY_OSK_LANGUAGE_DEFAULT   = 0x00,
	PSP_UTILITY_OSK_LANGUAGE_JAPANESE  = 0x01,
	PSP_UTILITY_OSK_LANGUAGE_ENGLISH   = 0x02,
	PSP_UTILITY_OSK_LANGUAGE_FRENCH    = 0x03,
	PSP_UTILITY_OSK_LANGUAGE_SPANISH   = 0x04,
	PSP_UTILITY_OSK_LANGUAGE_GERMAN    = 0x05,
	PSP_UTILITY_OSK_LANGUAGE_ITALIAN   = 0x06,
	PSP_UTILITY_OSK_LANGUAGE_DUTCH     = 0x07,
	PSP_UTILITY_OSK_LANGUAGE_PORTUGESE = 0x08,
	PSP_UTILITY_OSK_LANGUAGE_RUSSIAN   = 0x09,
	PSP_UTILITY_OSK_LANGUAGE_KOREAN    = 0x0a
};

/**
* Enumeration for OSK internal state
*/
enum SceUtilityOskState
{
	PSP_UTILITY_OSK_DIALOG_NONE     = 0, /**< No OSK is currently active */
	PSP_UTILITY_OSK_DIALOG_INITING  = 1, /**< The OSK is currently being initialized */
	PSP_UTILITY_OSK_DIALOG_INITED   = 2, /**< The OSK is initialised */
	PSP_UTILITY_OSK_DIALOG_VISIBLE  = 3, /**< The OSK is visible and ready for use */
	PSP_UTILITY_OSK_DIALOG_QUIT     = 4, /**< The OSK has been cancelled and should be shut down */
	PSP_UTILITY_OSK_DIALOG_FINISHED = 5  /**< The OSK has successfully shut down */	
};

/**
* Enumeration for OSK field results
*/
enum SceUtilityOskResult
{
	PSP_UTILITY_OSK_RESULT_UNCHANGED = 0,
	PSP_UTILITY_OSK_RESULT_CANCELLED = 1,
	PSP_UTILITY_OSK_RESULT_CHANGED   = 2
};

/**
* Enumeration for input types (these are limited by initial choice of language)
*/
enum SceUtilityOskInputType
{
	PSP_UTILITY_OSK_INPUTTYPE_ALL                    = 0x00000000,
	PSP_UTILITY_OSK_INPUTTYPE_LATIN_DIGIT            = 0x00000001,
	PSP_UTILITY_OSK_INPUTTYPE_LATIN_SYMBOL           = 0x00000002,
	PSP_UTILITY_OSK_INPUTTYPE_LATIN_LOWERCASE        = 0x00000004,
	PSP_UTILITY_OSK_INPUTTYPE_LATIN_UPPERCASE        = 0x00000008,
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_DIGIT         = 0x00000100,
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_SYMBOL        = 0x00000200,
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_LOWERCASE     = 0x00000400,
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_UPPERCASE     = 0x00000800,
	// http://en.wikipedia.org/wiki/Hiragana
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_HIRAGANA      = 0x00001000,
	// http://en.wikipedia.org/wiki/Katakana
	// Half-width Katakana
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_HALF_KATAKANA = 0x00002000,
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_KATAKANA      = 0x00004000,
	// http://en.wikipedia.org/wiki/Kanji
	PSP_UTILITY_OSK_INPUTTYPE_JAPANESE_KANJI         = 0x00008000,
	PSP_UTILITY_OSK_INPUTTYPE_RUSSIAN_LOWERCASE      = 0x00010000,
	PSP_UTILITY_OSK_INPUTTYPE_RUSSIAN_UPPERCASE      = 0x00020000,
	PSP_UTILITY_OSK_INPUTTYPE_KOREAN                 = 0x00040000,
	PSP_UTILITY_OSK_INPUTTYPE_URL                    = 0x00080000
};

#if COMMON_LITTLE_ENDIAN
typedef SceUtilityOskState SceUtilityOskState_le;
typedef SceUtilityOskInputLanguage SceUtilityOskInputLanguage_le;
typedef SceUtilityOskResult SceUtilityOskResult_le;
#else
typedef swap_struct_t<SceUtilityOskState, swap_32_t<SceUtilityOskState> > SceUtilityOskState_le;
typedef swap_struct_t<SceUtilityOskInputLanguage, swap_32_t<SceUtilityOskInputLanguage> > SceUtilityOskInputLanguage_le;
typedef swap_struct_t<SceUtilityOskResult, swap_32_t<SceUtilityOskResult> > SceUtilityOskResult_le;
#endif

/**
* OSK Field data
*/
struct SceUtilityOskData
{
	/** Unknown. Pass 0. */
	s32_le unk_00;
	/** Unknown. Pass 0. */
	s32_le unk_04;
	/** One of ::SceUtilityOskInputLanguage */
	SceUtilityOskInputLanguage_le language;
	/** Unknown. Pass 0. */
	s32_le unk_12;
	/** One or more of ::SceUtilityOskInputType (types that are selectable by pressing SELECT) */
	s32_le inputtype;
	/** Number of lines */
	s32_le lines;
	/** Unknown. Pass 0. */
	s32_le unk_24;
	/** Description text */
	PSPPointer<u16_le> desc;
	/** Initial text */
	PSPPointer<u16_le> intext;
	// Length, in unsigned shorts, including the terminator.
	u32_le outtextlength;
	/** Pointer to the output text */
	PSPPointer<u16_le> outtext;
	/** Result. One of ::SceUtilityOskResult */
	SceUtilityOskResult_le result;
	// Number of characters to allow, not including terminator (if less than outtextlength - 1.)
	u32_le outtextlimit;
};

// Parameters to sceUtilityOskInitStart
struct SceUtilityOskParams
{
	pspUtilityDialogCommon base;
	// Number of fields.
	s32_le fieldCount;
	// Pointer to an array of fields (see SceUtilityOskData.)
	PSPPointer<SceUtilityOskData> fields;
	SceUtilityOskState_le state;
	// Maybe just padding?
	s32_le unk_60;
};

// Internal enum, not from PSP.
enum OskKeyboardDisplay
{
	OSK_KEYBOARD_LATIN_LOWERCASE,
	OSK_KEYBOARD_LATIN_UPPERCASE,
	OSK_KEYBOARD_HIRAGANA,
	OSK_KEYBOARD_KATAKANA,
	OSK_KEYBOARD_KOREAN,
	OSK_KEYBOARD_RUSSIAN_LOWERCASE,
	OSK_KEYBOARD_RUSSIAN_UPPERCASE,
	OSK_KEYBOARD_LATIN_FW_LOWERCASE,
	OSK_KEYBOARD_LATIN_FW_UPPERCASE,
	// TODO: Something to do native?
	OSK_KEYBOARD_COUNT
};

// Internal enum, not from PSP.
enum OskKeyboardLanguage
{
	OSK_LANGUAGE_ENGLISH, //English half-width
	OSK_LANGUAGE_JAPANESE,
	OSK_LANGUAGE_KOREAN,
	OSK_LANGUAGE_RUSSIAN,
	OSK_LANGUAGE_ENGLISH_FW, //English full-width (mostly used in Japanese games)
	OSK_LANGUAGE_COUNT
};

// Internal enum, not from PSP.
enum
{
	LOWERCASE,
	UPPERCASE
};

const OskKeyboardDisplay OskKeyboardCases[OSK_LANGUAGE_COUNT][2] =
{
	{ OSK_KEYBOARD_LATIN_LOWERCASE, OSK_KEYBOARD_LATIN_UPPERCASE },
	{ OSK_KEYBOARD_HIRAGANA, OSK_KEYBOARD_KATAKANA },
	{ OSK_KEYBOARD_KOREAN, OSK_KEYBOARD_KOREAN }, // Korean only has one case, so just repeat it.
	{ OSK_KEYBOARD_RUSSIAN_LOWERCASE, OSK_KEYBOARD_RUSSIAN_UPPERCASE },
	{ OSK_KEYBOARD_LATIN_FW_LOWERCASE, OSK_KEYBOARD_LATIN_FW_UPPERCASE }
};

static const std::string OskKeyboardNames[] =
{
	"en_US",
	"ja_JP",
	"ko_KR",
	"ru_RU",
	"English Full-width",
};

enum class PSPOskNativeStatus {
	IDLE,
	DONE,
	WAITING,
	SUCCESS,
	FAILURE,
};

class PSPOskDialog: public PSPDialog {
public:
	PSPOskDialog(UtilityDialogType type);
	~PSPOskDialog();

	int Init(u32 oskPtr);
	int Update(int animSpeed) override;
	int Shutdown(bool force = false) override;
	void DoState(PointerWrap &p) override;
	pspUtilityDialogCommon *GetCommonParam() override;

protected:
	bool UseAutoStatus() override {
		return false;
	}

private:
	void ConvertUCS2ToUTF8(std::string& _string, const PSPPointer<u16_le>& em_address);
	void ConvertUCS2ToUTF8(std::string& _string, const char16_t *input);
	void RenderKeyboard();
	int NativeKeyboard();

	std::u16string CombinationString(bool isInput); // for Japanese, Korean
	std::u16string CombinationKorean(bool isInput); // for Korea
	void RemoveKorean(); // for Korean character removal

	u32 FieldMaxLength();
	int GetIndex(const wchar_t* src, wchar_t ch);

	PSPPointer<SceUtilityOskParams> oskParams{};
	std::string oskDesc;
	std::string oskIntext;
	std::string oskOuttext;

	int selectedChar = 0;
	std::u16string inputChars;
	OskKeyboardDisplay currentKeyboard = OSK_KEYBOARD_LATIN_LOWERCASE;
	OskKeyboardLanguage currentKeyboardLanguage = OSK_LANGUAGE_ENGLISH;
	bool isCombinated = false;

	std::mutex nativeMutex_;
	PSPOskNativeStatus nativeStatus_ = PSPOskNativeStatus::IDLE;
	std::string nativeValue_;

	int i_level = 0; // for Korean Keyboard support
	int i_value[3]{}; // for Korean Keyboard support
};