/* -*- c++ -*- */
/***************************************************************************
 *            database_gourmet.cc
 *
 *  Sun Apr 24 18:27:56 CEST 2022
 *  Copyright 2022 Bent Bisballe Nyeng
 *  deva@aasimon.org
 ****************************************************************************/

/*
 *  This file is part of Qookie.
 *
 *  Qookie 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Qookie 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 Qookie; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA.
 */
#include "database_gourmet.h"

#include <sqlite3.h>
#include <iostream>
#include <cassert>

// https://www.tutorialspoint.com/sqlite/sqlite_c_cpp.htm

DatabaseGourmet::DatabaseGourmet(const std::string& file)
{
	auto rc = sqlite3_open(file.data(), &db); // https://sqlite.org/c3ref/open.html
	if(rc)
	{
		std::cerr << "Can't open database: " << sqlite3_errmsg(db) << '\n';
		return;
	}
	else
	{
		std::cout << "Opened database successfully\n";
	}
}

DatabaseGourmet::~DatabaseGourmet()
{
	sqlite3_close(db);
}

namespace
{
std::string getString(sqlite3_stmt *statement, int index)
{
	int size = sqlite3_column_bytes(statement, index);
	std::string str;
	str.append((const char*)sqlite3_column_blob(statement, index), size);
	return str;
}
} // ::

std::deque<RecipeItem> DatabaseGourmet::getRecipes()
{
	std::deque<RecipeItem> items;

	std::string sql = "select id, title, image from recipe";
	sqlite3_stmt *statement;
	if(sqlite3_prepare_v2(db, sql.data(), sql.length(), &statement, 0) != SQLITE_OK)
	{
		std::cerr << "sqlite3_prepare_v2 failed: " << sqlite3_errmsg(db) << '\n';
		return {};
	}

	int result = 0;
	while(true)
	{
		RecipeItem item;
		result = sqlite3_step(statement);

		if(result == SQLITE_ROW)
		{
			item.db = DatabaseSource::Gourmet;
			item.id = sqlite3_column_int(statement, 0);

			item.title = getString(statement, 1);
			item.image = getString(statement, 2);
		}
		else
		{
			break;
		}
		items.push_back(item);
	}

	return items;
}

Recipe DatabaseGourmet::getRecipe(int id)
{
	bool found{false};
	Recipe recipe;

	{
		std::string sql =
			"select id, title, description, image, instructions, source, link, cuisine, cooktime, preptime, yields, yield_unit, modifications from recipe where id=" +
			std::to_string(id);
		sqlite3_stmt *statement;
		if(sqlite3_prepare_v2(db, sql.data(), sql.length(), &statement, 0) != SQLITE_OK)
		{
			std::cerr << "sqlite3_prepare_v2 failed: " << sqlite3_errmsg(db) << '\n';
			return {};
		}

		int result = 0;
		while(true)
		{
			result = sqlite3_step(statement);

			if(result == SQLITE_ROW)
			{
				recipe.db = DatabaseSource::Gourmet;
				recipe.id = sqlite3_column_int(statement, 0);
				recipe.title = getString(statement, 1);
				recipe.description = getString(statement, 2);
				recipe.image = getString(statement, 3);
				recipe.instructions = getString(statement, 4);
				recipe.source = getString(statement, 5);
				if(!recipe.source.empty())
				{
					recipe.source += " ";
				}
				recipe.source += getString(statement, 6);
				recipe.cuisine = getString(statement, 7);
				recipe.cooktime = sqlite3_column_int(statement, 8);
				recipe.preptime = sqlite3_column_int(statement, 9);
				recipe.yields = sqlite3_column_double(statement, 10);
				recipe.yield_unit = getString(statement, 11);
				recipe.tags.push_back(getString(statement, 12));
			}
			else
			{
				break;
			}
			found = true;
		}
	}

	if(!found)
	{
		std::cerr << "id " << id << " not found\n";
		return {};
	}

	{
		std::string sql =
			"select amount, unit, item, inggroup from ingredients where recipe_id=" +
			std::to_string(id) + " order by position asc";
		sqlite3_stmt *statement;
		if(sqlite3_prepare_v2(db, sql.data(), sql.length(), &statement, 0) != SQLITE_OK)
		{
			std::cerr << "sqlite3_prepare_v2 failed: " << sqlite3_errmsg(db) << '\n';
			return {};
		}

		recipe.ingredient_groups.push_back({}); // first group is the empty-titled one.

		int result = 0;
		while(true)
		{
			Ingredient ingredient;
			result = sqlite3_step(statement);

			if(result == SQLITE_ROW)
			{
				ingredient.amount = sqlite3_column_double(statement, 0);
				ingredient.unit = getString(statement, 1);
				ingredient.item = getString(statement, 2);
				auto group_title = getString(statement, 3);
				auto* group = &recipe.ingredient_groups.back();
				assert(recipe.ingredient_groups.size() > 0);
				if(group->title != group_title)
				{
					recipe.ingredient_groups.push_back({group_title, {}});
					group = &recipe.ingredient_groups.back();
				}

				group->ingredients.push_back(ingredient);
			}
			else
			{
				break;
			}
		}
	}

	return recipe;
}