/*
===========================================================================
blockattack - Block Attack - Rise of the Blocks
Copyright (C) 2005-2018 Poul Sander

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, either version 2 of the License, or
(at your option) any later version.

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 for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see http://www.gnu.org/licenses/

Source information and contacts persons can be found at
https://blockattack.net
===========================================================================
*/

#include "HelpHowtoState.hpp"
#include "global.hpp"
#include "common.h"
#include "MenuSystem.h"
#include <cmath>


/**
 * Draws bricks with a string like:
 * "aab" for two identical one and another
 * "aaB" the third one will have a bomb
 * The any char not in 'a' to 'g' or 'A' to 'G' the behavior is undefined.
 * @param target Target to draw to
 * @param bricks description on what to draw as a string
 * @param x
 * @param y
 */
static void RenderRowOfBricks(SDL_Renderer* target, const std::string& brickStr, int x, int y) {
	Uint32 tick = SDL_GetTicks();
	for (size_t i = 0; i < brickStr.size(); ++i) {
		bool bomb = false;
		char brickChar = brickStr[i];
		if (brickChar >= 'A' && brickChar <= 'G') {
			bomb = true;
			brickChar = brickChar + 'a' - 'A';
		}
		if (brickChar >= 'a' &&  brickChar <= 'g') {
			globalData.bricks[brickChar - 'a'].Draw(target, tick, x+i*50, y);
			if (bomb) {
				globalData.spriteHolder->GetSprite("block_bomb").Draw(target, tick, x+i*50, y);
			}
		}
	}
}

class HorizontalSwitchAnimation {
public:
	std::string brickStr = "abc";
	int cursorPos = 0;
	int state = 0; //0=move left, 1 = switch, 2 = move right, 3 = switch
	Uint32 lastTick = 0;
	Uint32 animationSpeed = 2000;

	void Update (Uint32 tick) {
		if (tick > lastTick + animationSpeed) {
			lastTick = tick;
			switch (state) {
			case 0:
				cursorPos = 1;
				break;
			case 1:  //fallthough
			case 3:
				std::swap(brickStr[cursorPos], brickStr[cursorPos + 1]);
				break;
			case 2:
				cursorPos = 0;
				break;
			}
			++state;
			if (state > 3) {
				state = 0;
			}
		}
	}
};

class MultiLineBlocks {
private:
	std::vector<std::string> lines;
public:
	MultiLineBlocks& addLine(const std::string& line) {
		lines.push_back(line);
		return *this;
	}

	void Render(SDL_Renderer* target, int x, int y) {
		for (size_t i = 0; i < lines.size(); ++i) {
			RenderRowOfBricks(target, lines[i], x, y+i*50);
		}
	}

};

HorizontalSwitchAnimation switchAnimation;
sago::SagoTextField switchAnimationField;
sago::SagoTextField clearRowfield;
sago::SagoTextField comboField;
sago::SagoTextField dropField;
sago::SagoTextField chainField;

static void InitTextField(sago::SagoTextField& field, const char* text) {
	field.SetHolder(&globalData.spriteHolder->GetDataHolder());
	field.SetFontSize(30);
	field.SetOutline(2, {0,0,0,255});
	field.SetText(text);
}

HelpHowtoState::HelpHowtoState() {
	InitTextField(switchAnimationField, _("Switch block horizontally"));
	InitTextField(clearRowfield, _("Match 3 to clear"));
	InitTextField(comboField, _("Create combos!"));
	InitTextField(dropField, _("Drop blocks!"));
	InitTextField(chainField, _("Create a chain effect"));
}

HelpHowtoState::~HelpHowtoState() {
}

const double PI  =3.141592653589793238463;

static void DrawArrow(SDL_Renderer* target, int x1, int y1, int x2, int y2) {
	double dx = x1-x2;
	double dy = y1-y2;
	double distance = std::sqrt((dx*dx)+(dy*dy));
	dx = dx * 10.0 / distance;
	dy = dy * 10.0 / distance;
	double angle= PI/4.0;
	double nx1 = dx * std::cos(angle) - dy * std::sin(angle) + x2;
	double ny1 = dx * std::sin(angle) + dy * std::cos(angle) + y2;
	SDL_RenderDrawLine(target, x1, y1, x2, y2);
	SDL_RenderDrawLine(target, nx1, ny1, x2, y2);
	nx1 = dx * std::cos(-angle) - dy * std::sin(-angle) + x2;
	ny1 = dx * std::sin(-angle) + dy * std::cos(-angle) + y2;
	SDL_RenderDrawLine(target, nx1, ny1, x2, y2);
}

void HelpHowtoState::Draw(SDL_Renderer* target) {
	DrawBackground(target);
	SDL_SetRenderDrawColor(target, 0, 0, 0, SDL_ALPHA_OPAQUE);
	RenderRowOfBricks(target, switchAnimation.brickStr, 50, 50);
	globalData.spriteHolder->GetSprite("cursor").Draw(target, SDL_GetTicks(), 50+switchAnimation.cursorPos*50, 50);
	switchAnimationField.Draw(target, 50 +150+30, 50+25, sago::SagoTextField::Alignment::left, sago::SagoTextField::VerticalAlignment::center);
	RenderRowOfBricks(target, "adaa", 50, 150);
	globalData.spriteHolder->GetSprite("cursor").Draw(target, SDL_GetTicks(), 50, 150);
	RenderRowOfBricks(target, "dAAA", 50+300, 150);
	DrawArrow(target, 50+200+25, 150+25, 50+300-25, 150+25);
	clearRowfield.Draw(target, 600, 150+25, sago::SagoTextField::Alignment::left, sago::SagoTextField::VerticalAlignment::center);
	comboField.Draw(target, 50+175, 410, sago::SagoTextField::Alignment::center);
	MultiLineBlocks().addLine("ab").addLine("ba").addLine("ab").Render(target, 50, 250);
	globalData.spriteHolder->GetSprite("cursor").Draw(target, SDL_GetTicks(), 50, 250+50);
	MultiLineBlocks().addLine("AB").addLine("AB").addLine("AB").Render(target, 50+200, 250);
	DrawArrow(target, 175, 325, 225, 325);
	MultiLineBlocks().addLine("a").addLine("b").addLine("e").Render(target, 50+400, 250);
	globalData.spriteHolder->GetSprite("cursor").Draw(target, SDL_GetTicks(), 50+400, 250);
	MultiLineBlocks().addLine(" ").addLine("b").addLine("ea").Render(target, 50+400+200, 250);
	dropField.Draw(target, 50+400+150, 410, sago::SagoTextField::Alignment::center);
	DrawArrow(target, 575, 325, 625, 325);
	DrawArrow(target, 475, 275, 525, 275);
	DrawArrow(target, 525, 275, 525, 375);
	DrawArrow(target, 675, 275, 725, 275);
	DrawArrow(target, 725, 275, 725, 375);
	MultiLineBlocks().addLine(" d").addLine(" f").addLine(" f").addLine("fdd").Render(target, 50, 500);
	MultiLineBlocks().addLine(" d").addLine(" F").addLine(" F").addLine("dFd").Render(target, 50+200, 500);
	MultiLineBlocks().addLine(" d").addLine("  ").addLine("  ").addLine("d d").Render(target, 50+200*2, 500);
	MultiLineBlocks().addLine("  ").addLine("  ").addLine("  ").addLine("DDD").Render(target, 50+200*3, 500);
	globalData.spriteHolder->GetSprite("cursor").Draw(target, SDL_GetTicks(), 50, 650);
	DrawArrow(target, 200, 600, 250, 600);
	DrawArrow(target, 400, 600, 450, 600);
	DrawArrow(target, 600, 600, 650, 600);
	DrawArrow(target, 525, 525, 525, 675);
	chainField.Draw(target, 400, 710, sago::SagoTextField::Alignment::center);
	HelpCommonState::Draw(target);
}

void HelpHowtoState::Update() {
	switchAnimation.Update(SDL_GetTicks());
	HelpCommonState::Update();
}