/*
===========================================================================
blockattack - Block Attack - Rise of the Blocks
Copyright (C) 2005-2025 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 "PuzzleEditorState.hpp"

#include <unistd.h>
#include <fmt/core.h>

#include "imgui.h"
#include "imgui_internal.h"
#include "backends/imgui_impl_sdl2.h"
#include "backends/imgui_impl_sdlrenderer2.h"
#include "../sago/SagoMisc.hpp"
#include "../puzzlehandler.hpp"


void SetSinglePuzzleMode(int level);

PuzzleEditorState::PuzzleEditorState() {
	this->window_resize = sago::SagoLogicalResize(BOARD_WIDTH+5, BOARD_HEIGHT+5);
}

bool PuzzleEditorState::IsActive() {
	return isActive;
}

void PuzzleEditorState::ProcessInput(const SDL_Event& event, bool& processed) {
	if (event.type == SDL_KEYDOWN && !read_only) {
		const Uint8* keystate = SDL_GetKeyboardState(nullptr);
		const bool ctrl_held = keystate[SDL_SCANCODE_LCTRL] || keystate[SDL_SCANCODE_RCTRL];

		if (ctrl_held && event.key.keysym.sym == SDLK_z) {
			if (keystate[SDL_SCANCODE_LSHIFT] || keystate[SDL_SCANCODE_RSHIFT]) {
				Redo();
			} else {
				Undo();
			}
			processed = true;
		} else if (ctrl_held && event.key.keysym.sym == SDLK_y) {
			Redo();
			processed = true;
		}
	}
}

void PuzzleEditorState::Init() {
	this->selected_file = "";
	this->puzzle_files = sago::GetFileList("puzzles");
}

void PuzzleEditorState::SelectFile(const std::string& file) {
	undo_file_stack[this->selected_file] = undo_stack;
	redo_file_stack[this->selected_file] = redo_stack;
	this->selected_file = file;
	PuzzleSetName(file);
	LoadPuzzleStages();
	read_only = false;
	undo_stack = undo_file_stack[this->selected_file];
	redo_stack = redo_file_stack[this->selected_file];
	if (file == "puzzle.levels") {
		read_only = true;
	}
}

static void LogicalToPhysical(const sago::SagoLogicalResize& resize, ImVec2& inout) {
	const int inx = inout.x;
	const int iny = inout.y;
	int out_x = inout.x;
	int out_y = inout.y;
	resize.LogicalToPhysical(inx, iny, out_x, out_y);
	inout.x = out_x;
	inout.y = out_y;
}


static void ImGuiWritePartOfTexture(SDL_Texture* texture, int topx, int topy, int tex_w, int tex_h, int w, int h) {
	const float sprite_w = tex_w;
	const float sprite_h = tex_h;
	const float top_x_f = topx;
	const float top_y_f = topy;
	const ImVec2 uv0 = ImVec2(top_x_f / tex_w, top_y_f / tex_h);
	const ImVec2 uv1 = ImVec2((top_x_f + sprite_w) / tex_w, (top_y_f + sprite_h) / tex_h);
	ImGui::Image((ImTextureID)(intptr_t)texture, ImVec2((float)w, (float)h), uv0, uv1);
}


static void DrawBrick(int brick, int x, int y, int width, int height) {
	if (brick < 0 || brick > 6) {
		return;
	}

	sago::SagoSprite& sprite = globalData.bricks[brick];
	ImGui::SetCursorScreenPos({ static_cast<float>(x), static_cast<float>(y) });
	ImGuiWritePartOfTexture(sprite.GetTextureHandler().get(), sprite.GetImageCord().x, sprite.GetImageCord().y, sprite.GetWidth(), sprite.GetHeight(), width, height);
}

/**
 * Takes the brick pointed to and moves up all bricks above it to leave an empty space.
 * If bricks are pushed out of the board then the disappear.
 * @param level The level to edit
 * @param x
 * @param y
 */
static void BricksMoveUp(int level, int x, int y) {
	for (int i = 11; i > y; i--) {
		PuzzleSetBrick(level, x, i, PuzzleGetBrick(level, x, i-1));
	}
	PuzzleSetBrick(level, x, y, -1);  //Clear the space we started
}

static void BricksMoveDown(int level, int x, int y) {
	for (int i = 0; i < y; i++) {
		PuzzleSetBrick(level, x, i, PuzzleGetBrick(level, x, i+1));
	}
	PuzzleSetBrick(level, x, y, -1);  //Clear the space we started
}

static void BricksMoveColumnLeft(int level, int x) {
	for (int i=0; i < x; i++) {
		for (int j=0; j<12 ; j++) {
			PuzzleSetBrick(level, i, j, PuzzleGetBrick(level, i+1, j));
		}
	}
	for (int j=0; j<12 ; j++) {
		PuzzleSetBrick(level, x, j, -1);
	}
}

static void BricksMoveColumnRight(int level, int x) {
	for (int i=5; i > x; i--) {
		for (int j=0; j<12 ; j++) {
			PuzzleSetBrick(level, i, j, PuzzleGetBrick(level, i-1, j));
		}
	}
	for (int j=0; j<12 ; j++) {
		PuzzleSetBrick(level, x, j, -1);
	}
}


void PuzzleEditorState::SaveCurrentState() {
	if (undo_stack.size() >= MAX_UNDO_STATES) {
		std::vector<PuzzleState> temp;
		for (size_t i = 0; i < MAX_UNDO_STATES - 1; ++i) {
			temp.push_back(undo_stack.back());
			undo_stack.pop_back();
		}
		undo_stack = std::vector<PuzzleState>();
		while (temp.size()) {
			undo_stack.push_back(temp.back());
			temp.pop_back();
		}
	}

	PuzzleState current_state;
	current_state.puzzle_count = PuzzleGetNumberOfPuzzles();
	current_state.current_puzzle = this->selected_puzzle;
	current_state.moves_allowed.resize(current_state.puzzle_count);

	for (int level = 0; level < current_state.puzzle_count; ++level) {
		current_state.moves_allowed[level] = PuzzleNumberOfMovesAllowed(level);
		for (int x = 0; x < 6; ++x) {
			for (int y = 0; y < 12; ++y) {
				current_state.puzzle_data[level][x][y] = PuzzleGetBrick(level, x, y);
			}
		}
	}

	undo_stack.push_back(current_state);
	while (redo_stack.size()) {
		redo_stack.pop_back();
	}
}

void PuzzleEditorState::Undo() {
	if (!CanUndo()) {
		return;
	}

	PuzzleState current_state;
	current_state.puzzle_count = PuzzleGetNumberOfPuzzles();
	current_state.current_puzzle = this->selected_puzzle;
	current_state.moves_allowed.resize(current_state.puzzle_count);

	for (int level = 0; level < current_state.puzzle_count; ++level) {
		current_state.moves_allowed[level] = PuzzleNumberOfMovesAllowed(level);
		for (int x = 0; x < 6; ++x) {
			for (int y = 0; y < 12; ++y) {
				current_state.puzzle_data[level][x][y] = PuzzleGetBrick(level, x, y);
			}
		}
	}
	redo_stack.push_back(current_state);

	PuzzleState previous_state = undo_stack.back();
	undo_stack.pop_back();

	EditorResizePuzzleNumber(previous_state.puzzle_count);
	for (int level = 0; level < previous_state.puzzle_count; ++level) {
		PuzzleNumberOfMovesAllowedSet(level, previous_state.moves_allowed[level]);
		for (int x = 0; x < 6; ++x) {
			for (int y = 0; y < 12; ++y) {
				PuzzleSetBrick(level, x, y, previous_state.puzzle_data[level][x][y]);
			}
		}
	}

	this->selected_puzzle = previous_state.current_puzzle;
	SavePuzzleStages();
}

void PuzzleEditorState::Redo() {
	if (!CanRedo()) {
		return;
	}

	PuzzleState current_state;
	current_state.puzzle_count = PuzzleGetNumberOfPuzzles();
	current_state.current_puzzle = this->selected_puzzle;
	current_state.moves_allowed.resize(current_state.puzzle_count);

	for (int level = 0; level < current_state.puzzle_count; ++level) {
		current_state.moves_allowed[level] = PuzzleNumberOfMovesAllowed(level);
		for (int x = 0; x < 6; ++x) {
			for (int y = 0; y < 12; ++y) {
				current_state.puzzle_data[level][x][y] = PuzzleGetBrick(level, x, y);
			}
		}
	}
	undo_stack.push_back(current_state);

	PuzzleState next_state = redo_stack.back();
	redo_stack.pop_back();

	EditorResizePuzzleNumber(next_state.puzzle_count);
	for (int level = 0; level < next_state.puzzle_count; ++level) {
		PuzzleNumberOfMovesAllowedSet(level, next_state.moves_allowed[level]);
		for (int x = 0; x < 6; ++x) {
			for (int y = 0; y < 12; ++y) {
				PuzzleSetBrick(level, x, y, next_state.puzzle_data[level][x][y]);
			}
		}
	}

	this->selected_puzzle = next_state.current_puzzle;
	SavePuzzleStages();
}

bool PuzzleEditorState::CanUndo() const {
	return undo_stack.size();
}

bool PuzzleEditorState::CanRedo() const {
	return redo_stack.size();
}

void PuzzleEditorState::BrickClicked(int x, int y) {
	if (read_only) {
		return;
	}
	if (x < 0 || x >= 6) {
		return;
	}
	if (y <0 || y >= 12) {
		return;
	}

	SaveCurrentState();

	if (selected_action >= 0 && selected_action < 7) {
		PuzzleSetBrick(this->selected_puzzle, x, y, this->selected_action);
	}
	if (selected_action == selection_clear) {
		PuzzleSetBrick(this->selected_puzzle, x, y, -1);
	}
	if (selected_action == selection_move_up) {
		BricksMoveUp(this->selected_puzzle, x, y);
	}
	if (selected_action == selection_move_down) {
		BricksMoveDown(this->selected_puzzle, x, y);
	}
	if (selected_action == selection_move_left) {
		BricksMoveColumnLeft(this->selected_puzzle, x);
	}
	if (selected_action == selection_move_right) {
		BricksMoveColumnRight(this->selected_puzzle, x);
	}
	SavePuzzleStages();

}

void PuzzleEditorState::Draw(SDL_Renderer* target) {
	DrawBackground(target);

	ImGui::Begin("Board area");
	ImGui::BeginChild("Test");
	ImVec2 p = ImGui::GetCursorScreenPos();
	ImVec2 size = ImGui::GetContentRegionAvail();
	const int x_offset = p.x;
	const int y_offset = p.y;
	constexpr int height = BOARD_HEIGHT;
	constexpr int width = BOARD_WIDTH;
	window_resize.SetPhysicalSize(size.x, size.y);


	int brick_size = 50;
	window_resize.LogicalToPhysical(&brick_size, nullptr);
	brick_size -= window_resize.GetLeftMargin();
	for (int i=0; i < 6; ++i) {
		for (int j=0; j < 12; ++j) {
			ImVec2 p1(i*50.0f, (11-j)*50.0f);
			LogicalToPhysical(window_resize, p1);
			p1.x += x_offset;
			p1.y += y_offset;
			const int brick = PuzzleGetBrick(this->selected_puzzle, i, j);
			DrawBrick(brick, static_cast<int>(p1.x), static_cast<int>(p1.y), brick_size, brick_size);
		}
	}

	for (int i=0; i <= 6;++i) {
		ImVec2 p1(i*50.0f, 0);
		ImVec2 p2(i*50.0f, height);
		LogicalToPhysical(window_resize, p1);
		LogicalToPhysical(window_resize, p2);
		p1.x += x_offset;
		p1.y += y_offset;
		p2.x += x_offset;
		p2.y += y_offset;
		ImGui::GetWindowDrawList()->AddLine(p1, p2, IM_COL32(255, 0, 0, 100));
	}
	for (int i=0; i <= 12;++i) {
		ImVec2 p1(0,i*50.0f);
		ImVec2 p2(width, i*50.0f);
		LogicalToPhysical(window_resize, p1);
		LogicalToPhysical(window_resize, p2);
		p1.x += x_offset;
		p1.y += y_offset;
		p2.x += x_offset;
		p2.y += y_offset;
		ImGui::GetWindowDrawList()->AddLine(p1, p2, IM_COL32(255, 0, 0, 100));
	}
	const ImGuiIO& io = ImGui::GetIO();
	if (ImGui::IsMouseReleased(0) && io.MouseDownDurationPrev[0] < 0.3f && !ImGui::IsMouseDragPastThreshold(0)) {
		ImVec2 pos = io.MousePos;
		pos.x -= x_offset;
		pos.y -= y_offset;
		int logical_pos_x = 0;
		int logical_pos_y = 0;
		window_resize.PhysicalToLogical(pos.x, pos.y, logical_pos_x, logical_pos_y);
		//std::cout << "Clicked at: " << pos.x << "," << pos.y << "\n";
		//std::cout << "Logical Pos: " << logical_pos_x << "," << logical_pos_y << "\n";
		const int board_x = logical_pos_x / 50;
		const int board_y = 11-(logical_pos_y / 50);
		if (board_x >=0 && board_x < 6 && board_y >= 0 && board_y < 12) {
			std::cout << "Board Pos: " << board_x << "," << board_y << "\n";
			BrickClicked(board_x, board_y);
		}

	}
	ImGui::EndChild();
	ImGui::End();

	ImGui::Begin("File list", nullptr, ImGuiWindowFlags_NoCollapse);
	for (const auto& file : this->puzzle_files) {
		if (ImGui::Selectable(file.c_str(), this->selected_file == file)) {
			SelectFile(file);
		}
	}

	ImGui::Separator();
	ImGui::InputText("##newfilename", new_filename_buffer, sizeof(new_filename_buffer));
	if (ImGui::Button("Create file")) {
		std::string new_file(new_filename_buffer);
		if (new_file.size()) {
			const auto it = std::find(puzzle_files.begin(), puzzle_files.end(), new_file);
			if (it == puzzle_files.end()) {
				puzzle_files.push_back(new_file);
				std::sort(puzzle_files.begin(), puzzle_files.end());
				sago::WriteFileContent(fmt::format("puzzles/{}", new_file).c_str(), "0"); // Create file with 0 puzzles in it
				SelectFile(new_file);
			}
		}
	}

	ImGui::End();
	ImGui::Begin("Puzzles in file");
	const int puzzle_count = PuzzleGetNumberOfPuzzles();
	for (int i = 0; i < puzzle_count; ++i) {
		if (ImGui::Selectable(std::to_string(i).c_str(), this->selected_puzzle == i)) {
			this->selected_puzzle = i;
		}
	}
	if (ImGui::Button("Add puzzle")) {
		if (!read_only) {
			SaveCurrentState();
			EditorAddPuzzle(this->selected_puzzle);
			SavePuzzleStages();
		}
	}
	if (ImGui::Button("Remove puzzle")) {
		if (!read_only) {
			SaveCurrentState();
			EditorRemovePuzzle(this->selected_puzzle);
			SavePuzzleStages();
		}
	}
	ImGui::End();

	ImGui::Begin("Palette");
	for (size_t i = 0; i < 7; ++i) {
		if (ImGui::Selectable(fmt::format("##{}", i).c_str(), this->selected_action == static_cast<int>(i), 0, ImVec2(0,50))) {
			this->selected_action = static_cast<int>(i);
		}
		ImGui::SameLine();
		sago::SagoSprite& sprite = globalData.bricks[i];
		ImGuiWritePartOfTexture(sprite.GetTextureHandler().get(), sprite.GetImageCord().x, sprite.GetImageCord().y, sprite.GetWidth(), sprite.GetHeight(), 50, 50);
	}
	if (ImGui::Selectable("Clear", this->selected_action == selection_clear)) {
		this->selected_action = selection_clear;
	}
	if (ImGui::Selectable("Move Up", this->selected_action == selection_move_up)) {
		this->selected_action = selection_move_up;
	}
	/*if (ImGui::Selectable("Move down", this->selected_action == selection_move_down)) {
		this->selected_action = selection_move_down;
	}
	if (ImGui::Selectable("Move left", this->selected_action == selection_move_left)) {
		this->selected_action = selection_move_left;
	}
	if (ImGui::Selectable("Move right", this->selected_action == selection_move_right)) {
		this->selected_action = selection_move_right;
	}*/
	ImGui::Separator();
	ImGui::LabelText("moves allowed", "%i", PuzzleNumberOfMovesAllowed(this->selected_puzzle));
	if (ImGui::Button("+1 move")) {
		if (!read_only) {
			SaveCurrentState();
			PuzzleNumberOfMovesAllowedSet(this->selected_puzzle, PuzzleNumberOfMovesAllowed(this->selected_puzzle)+1);
			SavePuzzleStages();
		}
	}
	if (ImGui::Button("-1 move")) {
		if (!read_only) {
			SaveCurrentState();
			PuzzleNumberOfMovesAllowedSet(this->selected_puzzle, PuzzleNumberOfMovesAllowed(this->selected_puzzle)-1);
			SavePuzzleStages();
		}
	}
	ImGui::Separator();
	if (read_only) {
		ImGui::LabelText("Read Only", "");
	} else {
		const bool undo_available = CanUndo();
		if (!undo_available) {
			ImGui::BeginDisabled();
		}
		if (ImGui::Button("Undo (Ctrl+Z)")) {
			Undo();
		}
		if (!undo_available) {
			ImGui::EndDisabled();
		}

		ImGui::SameLine();
		const bool redo_available = CanRedo();

		if (!redo_available) {
			ImGui::BeginDisabled();
		}
		if (ImGui::Button("Redo (Ctrl+Y)")) {
			Redo();
		}
		if (!redo_available) {
			ImGui::EndDisabled();
		}
	}
	ImGui::Separator();
	if (ImGui::Button("Play")) {
		SetSinglePuzzleMode(this->selected_puzzle);
		runGame(Gametype::Puzzle, this->selected_puzzle);
	}
	ImGui::End();
}

void PuzzleEditorState::Update() {
}