/* vim: tabstop=4 shiftwidth=4 noexpandtab
 *
 * Panel
 *
 * Provides a graphical panel with a clock, and
 * hopefully more things in the future.
 */
#include <stdlib.h>
#include <assert.h>
#include <math.h>
#include <time.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/utsname.h>

#define PANEL_HEIGHT 28

#include "lib/pthread.h"
#include "lib/yutani.h"
#include "lib/graphics.h"
#include "lib/shmemfonts.h"

sprite_t * sprites[128];
sprite_t alpha_tmp;

gfx_context_t * ctx;
yutani_t * yctx;
yutani_window_t * panel;
list_t * window_list;
volatile int lock = 0;
volatile int drawlock = 0;

size_t bg_size;
char * bg_blob;

int width;
int height;

int center_x(int x) {
	return (width - x) / 2;
}

int center_y(int y) {
	return (height - y) / 2;
}

static void spin_lock(int volatile * lock) {
	while(__sync_lock_test_and_set(lock, 0x01)) {
		syscall_yield();
	}
}

static void spin_unlock(int volatile * lock) {
	__sync_lock_release(lock);
}

void init_sprite(int i, char * filename, char * alpha) {
	sprites[i] = malloc(sizeof(sprite_t));
	load_sprite(sprites[i], filename);
	if (alpha) {
		sprites[i]->alpha = 1;
		load_sprite(&alpha_tmp, alpha);
		sprites[i]->masks = alpha_tmp.bitmap;
	} else {
		sprites[i]->alpha = ALPHA_OPAQUE;
	}
}

void init_sprite_png(int i, char * filename) {
	sprites[i] = malloc(sizeof(sprite_t));
	load_sprite_png(sprites[i], filename);
}

void redraw(void);

#define FONT_SIZE 14
#define TIME_LEFT 108
#define DATE_WIDTH 70

volatile int _continue = 1;

/* honestly no way we're gonna fit more at the moment... */
int icon_lefts[20] = {0};
int icon_wids[20] = {0};
int focused_app = -1;

struct window_ad {
	uint32_t flags;
	char * name;
	char * icon;
	char * strings;
};

void sig_int(int sig) {
	printf("Received shutdown signal in panel!\n");
	_continue = 0;
}

void set_focused(int i) {
	if (focused_app != i) {
		focused_app = i;
		redraw();
	}
}


void panel_check_click(struct yutani_msg_window_mouse_event * evt) {
	if (evt->command == YUTANI_MOUSE_EVENT_CLICK) {
		printf("Click!\n");
		if (evt->new_x >= width - 24 ) {
			yutani_session_end(yctx);
			_continue = 0;
		} else {
			for (int i = 0; i < 18; ++i) {
				if (evt->new_x >= icon_lefts[i] && evt->new_x < icon_lefts[i+1]) {
					if (icon_wids[i]) {
						yutani_focus_window(yctx, icon_wids[i]);
					}
					break;
				}
			}
		}
	} else if (evt->command == YUTANI_MOUSE_EVENT_MOVE || evt->command == YUTANI_MOUSE_EVENT_ENTER) {
		if (evt->new_y < PANEL_HEIGHT) {
			for (int i = 0; i < 18; ++i) {
				if (icon_lefts[i] == 0) {
					set_focused(-1);
					break;
				}
				if (evt->new_x >= icon_lefts[i] && evt->new_x < icon_lefts[i+1]) {
					set_focused(i);
					break;
				}
			}
		} else {
			set_focused(-1);
		}
	} else if (evt->command == YUTANI_MOUSE_EVENT_LEAVE) {
		set_focused(-1);
	}
}

void redraw(void) {
	spin_lock(&drawlock);

	struct timeval now;
	int last = 0;
	struct tm * timeinfo;
	char   buffer[80];

	uint32_t txt_color = rgb(230,230,230);
	int t = 0;

	memcpy(ctx->backbuffer, bg_blob, bg_size);
	gettimeofday(&now, NULL);
	last = now.tv_sec;
	timeinfo = localtime((time_t *)&now.tv_sec);

	strftime(buffer, 80, "%H:%M:%S", timeinfo);
	set_font_face(FONT_SANS_SERIF_BOLD);
	set_font_size(16);
	draw_string(ctx, width - TIME_LEFT, 19, txt_color, buffer);

	strftime(buffer, 80, "%A", timeinfo);
	set_font_face(FONT_SANS_SERIF);
	set_font_size(9);
	t = draw_string_width(buffer);
	t = (DATE_WIDTH - t) / 2;
	draw_string(ctx, width - TIME_LEFT - DATE_WIDTH + t, 11, txt_color, buffer);

	strftime(buffer, 80, "%h %e", timeinfo);
	set_font_face(FONT_SANS_SERIF_BOLD);
	set_font_size(9);
	t = draw_string_width(buffer);
	t = (DATE_WIDTH - t) / 2;
	draw_string(ctx, width - TIME_LEFT - DATE_WIDTH + t, 21, txt_color, buffer);

	set_font_face(FONT_SANS_SERIF_BOLD);
	set_font_size(14);
	draw_string(ctx, 10, 18, txt_color, "Applications");

	int i = 0, j = 0;
	spin_lock(&lock);
	if (window_list) {
		foreach(node, window_list) {
			struct window_ad * ad = node->value;
			char * s = ad->name;

			set_font_face(FONT_SANS_SERIF);
			set_font_size(14);
			if (j == focused_app) {
				draw_string(ctx, 140 + i, 18, rgb(142,216,255), s);
			} else {
				if (ad->flags & 1) {
					draw_string(ctx, 140 + i, 18, rgb(255,0,0), s);
				} else {
					draw_string(ctx, 140 + i, 18, txt_color, s);
				}
			}
			if (j < 18) {
				icon_lefts[j] = 140 + i;
				j++;
			}
			i += draw_string_width(s) + 20;
		}
		if (j < 19) {
			icon_lefts[j] = 140 + i;
			icon_lefts[j+1] = 0;
		}
	}
	spin_unlock(&lock);

	draw_sprite(ctx, sprites[1], width - 23, 1); /* Logout button */

	flip(ctx);
	yutani_flip(yctx, panel);

	spin_unlock(&drawlock);
}

void update_window_list(void) {
	yutani_query_windows(yctx);

	list_t * new_window_list = list_create();

	int i = 0;

	while (1) {
		yutani_msg_t * m = yutani_wait_for(yctx, YUTANI_MSG_WINDOW_ADVERTISE);
		struct yutani_msg_window_advertise * wa = (void*)m->data;

		if (wa->size == 0) {
			free(m);
			break;
		}

		if (i < 19) {
			icon_wids[i] = wa->wid;
			icon_wids[i+1] = 0;
		}

		struct window_ad * ad = malloc(sizeof(struct window_ad));

		char * s = malloc(wa->size);
		memcpy(s, wa->strings, wa->size);
		ad->name = &s[wa->offsets[0]];
		ad->icon = &s[wa->offsets[1]];
		ad->strings = s;
		ad->flags = wa->flags;

		list_insert(new_window_list, ad);
		free(m);

		i++;
	}

	spin_lock(&lock);
	if (window_list) {
		foreach(node, window_list) {
			struct window_ad * ad = (void*)node->value;
			free(ad->strings);
			free(ad);
		}
		list_free(window_list);
		free(window_list);
	}
	window_list = new_window_list;
	spin_unlock(&lock);

	redraw();
}

void * clock_thread(void * garbage) {
	while (_continue) {
		redraw();
		usleep(500000);
	}
}

int main (int argc, char ** argv) {
	yctx = yutani_init();

	width  = yctx->display_width;
	height = yctx->display_height;

	init_shmemfonts();
	set_font_size(14);

	/* Create the panel */
	panel = yutani_window_create(yctx, width, PANEL_HEIGHT);
	yutani_set_stack(yctx, panel, YUTANI_ZORDER_TOP);
	ctx = init_graphics_yutani_double_buffer(panel);
	draw_fill(ctx, rgba(0,0,0,0));
	flip(ctx);
	yutani_flip(yctx, panel);

	window_list = NULL;

	yutani_subscribe_windows(yctx);

	init_sprite_png(0, "/usr/share/panel.png");
	init_sprite_png(1, "/usr/share/icons/panel-shutdown.png");

	syscall_signal(2, sig_int);

	for (uint32_t i = 0; i < width; i += sprites[0]->width) {
		draw_sprite(ctx, sprites[0], i, 0);
	}

	bg_size = panel->width * panel->height * sizeof(uint32_t);
	bg_blob = malloc(bg_size);
	memcpy(bg_blob, ctx->backbuffer, bg_size);

	pthread_t _clock_thread;
	pthread_create(&_clock_thread, NULL, clock_thread, NULL);

	update_window_list();

	while (_continue) {
		yutani_msg_t * m = yutani_poll(yctx);
		if (m) {
			switch (m->type) {
				case YUTANI_MSG_NOTIFY:
					update_window_list();
					break;
				case YUTANI_MSG_WINDOW_MOUSE_EVENT:
					panel_check_click((struct yutani_msg_window_mouse_event *)m->data);
					break;
				default:
					break;
			}
			free(m);
		}
	}

	yutani_close(yctx, panel);
	yutani_unsubscribe_windows(yctx);

	return 0;
}