#ifndef DULCEPAN_H
#define DULCEPAN_H

#include <pixman.h>
#include <stdbool.h>
#include <stddef.h>
#include <wayland-util.h>

// Per-output
#define DP_SWAPCHAIN_LEN 2

enum dp_status {
	DP_STATUS_RUNNING,
	DP_STATUS_SAVED,
	DP_STATUS_QUIT,
};

struct dp_buffer {
	struct wl_buffer *wl_buffer;
	pixman_image_t *image;
	void *data;
	size_t size;
	bool used;
};

struct dp_output {
	struct dp_state *state;

	uint32_t name;
	struct wl_output *wl_output;

	struct wl_surface *main_surface;
	struct zwlr_layer_surface_v1 *main_layer_surface;
	struct wp_viewport *main_viewport;

	struct wl_surface *select_surface;
	struct wl_subsurface *select_subsurface;
	struct wp_viewport *select_viewport;

	int width, height;
	int32_t transform;
	bool has_geom;
	int transformed_width, transformed_height;

	int effective_width, effective_height;
	bool initialized;

	struct wl_callback *redraw_callback;
	bool needs_redraw;

	struct zwlr_screencopy_frame_v1 *frame;
	// XXX: this is completely untested
	bool y_invert;

	struct wl_buffer *frame_buffer;
	int32_t frame_stride;
	uint32_t frame_format;
	void *frame_data;
	size_t frame_size;

	struct dp_buffer swapchain[DP_SWAPCHAIN_LEN];

	struct wl_list link;
};

struct dp_seat {
	struct dp_state *state;

	uint32_t name;
	struct wl_seat *wl_seat;

	struct wl_keyboard *keyboard;
	struct wl_pointer *pointer;

	struct xkb_keymap *xkb_keymap;
	struct xkb_state *xkb_state;

	// The output the pointer is on
	struct dp_output *ptr_output;
	// In buffer space
	int ptr_x, ptr_y;

	struct wl_list link;
};

struct dp_selection {
	struct dp_output *output; // May be NULL
	int x, y, width, height;

	struct dp_output *interactive_output; // NULL if not interactively selecting
	int interactive_x, interactive_y;
	bool interactive_moved;
};

enum dp_file_format {
	DP_FILE_UNKNOWN = 0,

	DP_FILE_PNG,
	DP_FILE_PPM,
};

struct dp_config {
	pixman_color_t unselected_color;
	pixman_color_t selected_color;
	pixman_color_t border_color;
	int border_size; // 0 if disabled
	bool quick_select;
};

struct dp_state {
	enum dp_status status;

	struct wl_display *display;
	struct wl_registry *registry;

	struct wl_compositor *compositor;
	struct wl_subcompositor *subcompositor;
	struct wp_viewporter *viewporter;
	struct wl_shm *shm;
	struct zwlr_layer_shell_v1 *layer_shell;
	struct zwlr_screencopy_manager_v1 *screencopy_manager;

	bool initialized;

	struct xkb_context *xkb_context;

	struct wl_list outputs;
	struct wl_list seats;

	struct dp_selection selection;

	struct dp_config config;
	const char *output_path; // May be NULL
	enum dp_file_format output_format;

	pixman_image_t *unselected_fill_image;
	pixman_image_t *selected_fill_image;
	pixman_image_t *border_fill_image;
};

void dp_config_load(struct dp_config *config, const char *user_path);

// When done, data must be unmapped
struct wl_buffer *dp_buffer_create(struct dp_state *state, int32_t width, int32_t height,
		int32_t stride, uint32_t format, void **data, size_t *size);

void dp_output_create(struct dp_state *state, uint32_t name, struct wl_output *wl_output);
void dp_output_destroy(struct dp_output *output);

void dp_output_redraw(struct dp_output *output);

void dp_output_hide_surface(struct dp_output *output);

void dp_seat_create(struct dp_state *state, uint32_t name, struct wl_seat *wl_seat);
void dp_seat_destroy(struct dp_seat *seat);

void dp_select_interactive_start(
		struct dp_selection *selection, struct dp_output *output, int x, int y);
void dp_select_interactive_move(struct dp_selection *selection, int x, int y);
void dp_select_interactive_stop(struct dp_selection *selection);
void dp_select_whole(struct dp_selection *selection, struct dp_output *output);

void dp_save(struct dp_state *state);

void dp_log_error(const char *fmt, ...);
void dp_log_fatal(const char *fmt, ...);

void *dp_zalloc(size_t size);

const char *dp_ext_from_path(const char *path);
enum dp_file_format dp_ext_to_format(const char *ext);

#endif