/*
 * Copyright (C) 2012-2013 Andy Spencer <andy753421@gmail.com>
 *
 * This program 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.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <ncurses.h>

#include "util.h"
#include "date.h"
#include "cal.h"
#include "view.h"

/* Static data */
static WINDOW *win;

static int     line;   // scroll offset
static int     rows;   // number of rows

static int     srow;   // selected row 
static int     cursor; // index of the selected row
static int     items;  // number of items displayed
static int     first;  // cursor on first item in group
static int     last;   // cursor on last item in group

static int show_new      = 1;
static int show_started  = 1;
static int show_finished = 0;

/* Helper functions */
static int print_todos(WINDOW *win, int row, todo_t *todos, status_t low, status_t high)
{
	int n = 0, found = 0;
	for (todo_t *cur = todos; cur; cur = cur->next) {
		if (low <= cur->status && cur->status <= high) {
			if (found)
				last = 0;
			if (items++ == cursor) {
				found = 1;
				first = n == 0;
				last  = 1;
				TODO  = cur;
				srow  = row+n;
			}
			todo_line(win, cur, row+n++, 4, COLS-4, SHOW_DETAILS | SHOW_ACTIVE);
		}
	}
	return n;
}

static int print_group(WINDOW *win, int row, todo_t *todos,
		int show, const char *label, status_t low, status_t high)
{
	int n = 1;

	/* Label */
	wattron(win, A_BOLD | A_UNDERLINE);
	mvwprintw(win, row, 0, "%c",  label[0]);
	wattroff(win, A_UNDERLINE);
	mvwprintw(win, row, 1, "%s", &label[1]);
	wattroff(win, A_BOLD);

	/* Todos */
	if (show)
		n = print_todos(win, row+1, todos, low, high);

	/* Status */
	if (!show)
		mvwprintw(win, row+1, 4, "[hidden]");
	if (n == 0)
		mvwprintw(win, row+1, 4, "[no tasks]");

	return row+1+MAX(n,1)+1;
}

/* Todo init */
void todo_init(WINDOW *_win)
{
	win = _win;
}

/* Todo size */
void todo_size(int rows, int cols)
{
}

/* Todo draw */
void todo_draw(void)
{
	int row = -line;

	TODO = 0;
	items = 0;

	row = print_group(win, row, TODOS,
		show_new, "New Tasks", NEW, NEW);

	row = print_group(win, row, TODOS,
		show_started, "Started Tasks", NEW+1, DONE-1);

	row = print_group(win, row, TODOS,
		show_finished, "Finished Tasks", DONE, DONE);

	rows = row+line-1;
}

/* Todo run */
int todo_run(int key, mmask_t btn, int row, int col)
{
	int scroll = 0, move = 0, ref = 0;
	switch (key)
	{
		case 'g':    ref = 1; scroll = -line;     break;
		case 'G':    ref = 1; scroll =  rows;     break;
		case '\005': ref = 1; scroll =  1;        break; // ctrl-e
		case '\031': ref = 1; scroll = -1;        break; // ctrl-y
		case 'j':    ref = 1; move   =  1;        break;
		case 'k':    ref = 1; move   = -1;        break;
		case 'n':    ref = 1; show_new      ^= 1; break;
		case 's':    ref = 1; show_started  ^= 1; break;
		case 'f':    ref = 1; show_finished ^= 1; break;
		case 'e':    view_edit(EDIT_TODO); return 1;
		case '\012': view_edit(EDIT_TODO); return 1; // enter
	}

	/* Move more if we're on the edge of a group */
	int extra = 0;
	if (move < 0 && first) extra = -2;
	if (move > 0 && last)  extra =  2;

	/* Scroll window when we move off screen */
	int next = line + srow + move + extra;
	int ymax = getmaxy(win)-1;
	while (next-line < 0)    line--;
	while (next-line > ymax) line++;

	/* Update line and cursor positions */
	line   = CLAMP(line+scroll, 0, rows-1);
	cursor = CLAMP(cursor+move, 0, items-1);

	/* Repaint */
	if (ref) {
		werase(win);
		todo_draw();
		wrefresh(win);
	}
	return ref;
}