/* ************************************************************************** */
/*                                                                            */
/*                                                        :::      ::::::::   */
/*   state.c                                            :+:      :+:    :+:   */
/*                                                    +:+ +:+         +:+     */
/*   By: cacharle <marvin@42.fr>                    +#+  +:+       +#+        */
/*                                                +#+#+#+#+#+   +#+           */
/*   Created: 2020/02/24 09:58:01 by cacharle          #+#    #+#             */
/*   Updated: 2020/02/24 15:26:58 by cacharle         ###   ########.fr       */
/*                                                                            */
/* ************************************************************************** */

#include "fractol.h"

#define PALETTE_START 0x000022
#define PALETTE_END 0xd62f2f
/* #define PALETTE_START 0x000000 */
/* #define PALETTE_END 0xffffff */

static void st_state_init_palette(t_state *state)
{
	t_color	tmp;
	int		step_r;
	int		step_g;
	int		step_b;
	int		i;

	tmp.hexcode = PALETTE_START;
	step_r = ft_abs((PALETTE_END >> 16)         - (PALETTE_START >> 16)        ) / PALETTE_SIZE;
	step_g = ft_abs(((PALETTE_END >> 8) & 0xff) - ((PALETTE_START >> 8) & 0xff)) / PALETTE_SIZE;
	step_b = ft_abs((PALETTE_END & 0xff)        - (PALETTE_START & 0xff)       ) / PALETTE_SIZE;
	i = -1;
	while (++i < PALETTE_SIZE)
	{
		state->palette[i] = tmp;
		tmp.rgb.r += step_r;
		tmp.rgb.g += step_g;
		tmp.rgb.b += step_b;
	}
}

static int	st_state_dispatch_func(t_state *state, char *fractal_name)
{
	if (ft_strcmp(fractal_name, "mandelbrot") == 0)
		state->func = &mandelbrot;
	else if (ft_strcmp(fractal_name, "julia") == 0)
	{
		state->func = &julia;
		state->julia_const.r = 0.0;
		state->julia_const.i = 0.0;
		return (0);
	}
	else
		return (-1);
	state->julia_const.r = NAN;
	state->julia_const.i = NAN;
	return (0);
}

int	state_init(t_state *state, char *fractal_name)
{
	if (st_state_dispatch_func(state, fractal_name) < 0)
		return (-1);
	if ((state->mlx_ptr = mlx_init()) == NULL)
		return (-1);
	if ((state->window_ptr = mlx_new_window(state->mlx_ptr, 640, 480, WINDOW_TITLE)) == NULL)
		return (state_destroy(state));
	state->window.width = WINDOW_WIDTH;
	state->window.height = WINDOW_HEIGHT;
	if ((state->window.id = mlx_new_image(state->mlx_ptr, state->window.width, state->window.height)) == NULL)
		return (state_destroy(state));
	state->window.data = mlx_get_data_addr(state->window.id, &state->window.depth,
								&state->window.size_line, &state->window.endian);
	state->running = true;
	state->center.r = 0.0;
	state->center.i = 0.0;
	state->plane.r = 4.0;
	state->plane.i = 4.0;
	st_state_init_palette(state);
	state->updated = false;
	return (0);
}

int	state_destroy(t_state *state)
{
	if (state == NULL)
		return (-1);
	if (state->mlx_ptr != NULL && state->window.id != NULL)
			mlx_destroy_image(state->mlx_ptr, state->window.id);
	if (state->mlx_ptr != NULL && state->window_ptr != NULL)
			mlx_destroy_window(state->mlx_ptr, state->window_ptr);
	return (-1);	
}