// SPDX-License-Identifier: MIT
// Copyright (c) 2011-2013, Christopher Jeffrey
// Copyright (c) 2013 Richard Grenville <pyxlcy@gmail.com>
// Copyright (c) 2018 Yuxuan Shui <yshuiv7@gmail.com>
#pragma once

/// Common functions and definitions for configuration parsing
/// Used for command line arguments and config files

#include <stdbool.h>
#include <ctype.h>
#include <strings.h>
#include <xcb/xfixes.h>

#ifdef CONFIG_LIBCONFIG
#include <libconfig.h>
#endif

#include "region.h"
#include "log.h"
#include "compiler.h"
#include "win.h"
#include "types.h"

typedef struct session session_t;

/// VSync modes.
typedef enum {
	VSYNC_NONE,
	VSYNC_DRM,
	VSYNC_OPENGL,
	VSYNC_OPENGL_OML,
	VSYNC_OPENGL_SWC,
	VSYNC_OPENGL_MSWC,
	NUM_VSYNC,
} vsync_t;

/// @brief Possible backends of compton.
enum backend {
	BKEND_XRENDER,
	BKEND_GLX,
	BKEND_XR_GLX_HYBRID,
	NUM_BKEND,
};

typedef struct win_option_mask {
	bool shadow : 1;
	bool fade : 1;
	bool focus : 1;
	bool full_shadow : 1;
	bool redir_ignore : 1;
	bool opacity : 1;
} win_option_mask_t;

typedef struct win_option {
	bool shadow;
	bool fade;
	bool focus;
	bool full_shadow;
	bool redir_ignore;
	double opacity;
} win_option_t;

typedef struct _c2_lptr c2_lptr_t;

// This macro is here because this is the maximum number
// of blur passes options_t can hold, not a limitation of
// rendering.
/// @brief Maximum passes for blur.
#define MAX_BLUR_PASS 5

/// Structure representing all options.
typedef struct options_t {
	// === Debugging ===
	bool monitor_repaint;
	bool print_diagnostics;
	// === General ===
	/// The configuration file we used.
	char *config_file;
	/// Path to write PID to.
	char *write_pid_path;
	/// The backend in use.
	enum backend backend;
	/// Whether to sync X drawing with X Sync fence to avoid certain delay
	/// issues with GLX backend.
	bool xrender_sync_fence;
	/// Whether to avoid using stencil buffer under GLX backend. Might be
	/// unsafe.
	bool glx_no_stencil;
	/// Whether to avoid rebinding pixmap on window damage.
	bool glx_no_rebind_pixmap;
	/// GLX swap method we assume OpenGL uses.
	int glx_swap_method;
	/// Whether to use GL_EXT_gpu_shader4 to (hopefully) accelerates blurring.
	bool glx_use_gpushader4;
	/// Custom fragment shader for painting windows, as a string.
	char *glx_fshader_win_str;
	/// Whether to fork to background.
	bool fork_after_register;
	/// Whether to detect rounded corners.
	bool detect_rounded_corners;
	/// Force painting of window content with blending.
	bool force_win_blend;
	/// Resize damage for a specific number of pixels.
	int resize_damage;
	/// Whether to unredirect all windows if a full-screen opaque window
	/// is detected.
	bool unredir_if_possible;
	/// List of conditions of windows to ignore as a full-screen window
	/// when determining if a window could be unredirected.
	c2_lptr_t *unredir_if_possible_blacklist;
	/// Delay before unredirecting screen, in milliseconds.
	unsigned long unredir_if_possible_delay;
	/// Forced redirection setting through D-Bus.
	switch_t redirected_force;
	/// Whether to stop painting. Controlled through D-Bus.
	switch_t stoppaint_force;
	/// Whether to re-redirect screen on root size change.
	bool reredir_on_root_change;
	/// Whether to reinitialize GLX on root size change.
	bool glx_reinit_on_root_change;
	/// Whether to enable D-Bus support.
	bool dbus;
	/// Path to log file.
	char *logpath;
	/// Number of cycles to paint in benchmark mode. 0 for disabled.
	int benchmark;
	/// Window to constantly repaint in benchmark mode. 0 for full-screen.
	xcb_window_t benchmark_wid;
	/// A list of conditions of windows not to paint.
	c2_lptr_t *paint_blacklist;
	/// Whether to show all X errors.
	bool show_all_xerrors;
	/// Whether to avoid acquiring X Selection.
	bool no_x_selection;
	/// Window type option override.
	win_option_t wintype_option[NUM_WINTYPES];

	// === VSync & software optimization ===
	/// User-specified refresh rate.
	int refresh_rate;
	/// Whether to enable refresh-rate-based software optimization.
	bool sw_opti;
	/// VSync method to use;
	vsync_t vsync;
	/// Whether to do VSync aggressively.
	bool vsync_aggressive;
	/// Whether to use glFinish() instead of glFlush() for (possibly) better
	/// VSync yet probably higher CPU usage.
	bool vsync_use_glfinish;

	// === Shadow ===
	/// Red, green and blue tone of the shadow.
	double shadow_red, shadow_green, shadow_blue;
	int shadow_radius;
	int shadow_offset_x, shadow_offset_y;
	double shadow_opacity;
	/// argument string to shadow-exclude-reg option
	char *shadow_exclude_reg_str;
	/// Shadow blacklist. A linked list of conditions.
	c2_lptr_t *shadow_blacklist;
	/// Whether bounding-shaped window should be ignored.
	bool shadow_ignore_shaped;
	/// Whether to respect _COMPTON_SHADOW.
	bool respect_prop_shadow;
	/// Whether to crop shadow to the very Xinerama screen.
	bool xinerama_shadow_crop;

	// === Fading ===
	/// How much to fade in in a single fading step.
	opacity_t fade_in_step;
	/// How much to fade out in a single fading step.
	opacity_t fade_out_step;
	/// Fading time delta. In milliseconds.
	unsigned long fade_delta;
	/// Whether to disable fading on window open/close.
	bool no_fading_openclose;
	/// Whether to disable fading on ARGB managed destroyed windows.
	bool no_fading_destroyed_argb;
	/// Fading blacklist. A linked list of conditions.
	c2_lptr_t *fade_blacklist;

	// === Opacity ===
	/// Default opacity for inactive windows.
	/// 32-bit integer with the format of _NET_WM_OPACITY. 0 stands for
	/// not enabled, default.
	opacity_t inactive_opacity;
	/// Default opacity for inactive windows.
	opacity_t active_opacity;
	/// Whether inactive_opacity overrides the opacity set by window
	/// attributes.
	bool inactive_opacity_override;
	/// Frame opacity. Relative to window opacity, also affects shadow
	/// opacity.
	double frame_opacity;
	/// Whether to detect _NET_WM_OPACITY on client windows. Used on window
	/// managers that don't pass _NET_WM_OPACITY to frame windows.
	bool detect_client_opacity;

	// === Other window processing ===
	/// Whether to blur background of semi-transparent / ARGB windows.
	bool blur_background;
	/// Whether to blur background when the window frame is not opaque.
	/// Implies blur_background.
	bool blur_background_frame;
	/// Whether to use fixed blur strength instead of adjusting according
	/// to window opacity.
	bool blur_background_fixed;
	/// Background blur blacklist. A linked list of conditions.
	c2_lptr_t *blur_background_blacklist;
	/// Blur convolution kernel.
	xcb_render_fixed_t *blur_kerns[MAX_BLUR_PASS];
	/// How much to dim an inactive window. 0.0 - 1.0, 0 to disable.
	double inactive_dim;
	/// Whether to use fixed inactive dim opacity, instead of deciding
	/// based on window opacity.
	bool inactive_dim_fixed;
	/// Conditions of windows to have inverted colors.
	c2_lptr_t *invert_color_list;
	/// Rules to change window opacity.
	c2_lptr_t *opacity_rules;

	// === Focus related ===
	/// Whether to try to detect WM windows and mark them as focused.
	bool mark_wmwin_focused;
	/// Whether to mark override-redirect windows as focused.
	bool mark_ovredir_focused;
	/// Whether to use EWMH _NET_ACTIVE_WINDOW to find active window.
	bool use_ewmh_active_win;
	/// A list of windows always to be considered focused.
	c2_lptr_t *focus_blacklist;
	/// Whether to do window grouping with <code>WM_TRANSIENT_FOR</code>.
	bool detect_transient;
	/// Whether to do window grouping with <code>WM_CLIENT_LEADER</code>.
	bool detect_client_leader;

	// === Calculated ===
	/// Whether compton needs to track focus changes.
	bool track_focus;
	/// Whether compton needs to track window name and class.
	bool track_wdata;
	/// Whether compton needs to track window leaders.
	bool track_leader;
} options_t;

extern const char *const VSYNC_STRS[NUM_VSYNC + 1];
extern const char *const BACKEND_STRS[NUM_BKEND + 1];

attr_warn_unused_result bool parse_long(const char *, long *);
attr_warn_unused_result const char *parse_matrix_readnum(const char *, double *);
attr_warn_unused_result xcb_render_fixed_t *
parse_matrix(const char *, const char **, bool *hasneg);
attr_warn_unused_result xcb_render_fixed_t *
parse_conv_kern(const char *, const char **, bool *hasneg);
attr_warn_unused_result bool
parse_conv_kern_lst(const char *, xcb_render_fixed_t **, int, bool *hasneg);
attr_warn_unused_result bool parse_geometry(session_t *, const char *, region_t *);
attr_warn_unused_result bool parse_rule_opacity(c2_lptr_t **, const char *);

/**
 * Add a pattern to a condition linked list.
 */
bool condlst_add(c2_lptr_t **, const char *);

#ifdef CONFIG_LIBCONFIG
/// Parse a configuration file
/// Returns the actually config_file name used, allocated on heap
/// Outputs:
///   shadow_enable = whether shaodw is enabled globally
///   fading_enable = whether fading is enabled globally
///   win_option_mask = whether option overrides for specific window type is set for given
///                     options
///   hasneg = whether the convolution kernel has negative values
char *
parse_config_libconfig(options_t *, const char *config_file, bool *shadow_enable,
                       bool *fading_enable, bool *hasneg, win_option_mask_t *winopt_mask);
#endif

void set_default_winopts(options_t *, win_option_mask_t *, bool shadow_enable, bool fading_enable);
/// Parse a configuration file is that is enabled, also initialize the winopt_mask with
/// default values
/// Outputs and returns:
///   same as parse_config_libconfig
char *parse_config(options_t *, const char *config_file, bool *shadow_enable,
                  bool *fading_enable, bool *hasneg, win_option_mask_t *winopt_mask);

/**
 * Parse a backend option argument.
 */
static inline attr_const enum backend parse_backend(const char *str) {
	for (enum backend i = 0; BACKEND_STRS[i]; ++i) {
		if (!strcasecmp(str, BACKEND_STRS[i])) {
			return i;
		}
	}
	// Keep compatibility with an old revision containing a spelling mistake...
	if (!strcasecmp(str, "xr_glx_hybird")) {
		log_warn("backend xr_glx_hybird should be xr_glx_hybrid, the misspelt"
		         "version will be removed soon.");
		return BKEND_XR_GLX_HYBRID;
	}
	// cju wants to use dashes
	if (!strcasecmp(str, "xr-glx-hybrid")) {
		log_warn("backend xr-glx-hybrid should be xr_glx_hybrid, the alternative"
		         "version will be removed soon.");
		return BKEND_XR_GLX_HYBRID;
	}
	log_error("Invalid backend argument: %s", str);
	return NUM_BKEND;
}

/**
 * Parse a glx_swap_method option argument.
 *
 * Returns -2 on failure
 */
static inline attr_const int parse_glx_swap_method(const char *str) {
	// Parse alias
	if (!strcmp("undefined", str)) {
		return 0;
	}

	if (!strcmp("copy", str)) {
		return 1;
	}

	if (!strcmp("exchange", str)) {
		return 2;
	}

	if (!strcmp("buffer-age", str)) {
		return -1;
	}

	// Parse number
	char *pc = NULL;
	int age = strtol(str, &pc, 0);
	if (!pc || str == pc) {
		log_error("glx-swap-method is an invalid number: %s", str);
		return -2;
	}

	for (; *pc; ++pc)
		if (!isspace(*pc)) {
			log_error("Trailing characters in glx-swap-method option: %s", str);
			return -2;
		}

	if (age < -1) {
		log_error("Number for glx-swap-method is too small: %s", str);
		return -2;
	}

	return age;
}

/**
 * Parse a VSync option argument.
 */
static inline vsync_t parse_vsync(const char *str) {
	for (vsync_t i = 0; VSYNC_STRS[i]; ++i)
		if (!strcasecmp(str, VSYNC_STRS[i])) {
			return i;
		}

	log_error("Invalid vsync argument: %s", str);
	return NUM_VSYNC;
}

// vim: set noet sw=8 ts=8 :