/* ui-repolist.c: functions for generating the repolist page
 *
 * Copyright (C) 2006-2014 cgit Development Team <cgit@lists.zx2c4.com>
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"
#include "ui-repolist.h"
#include "html.h"
#include "ui-shared.h"

static time_t read_agefile(char *path)
{
	time_t result;
	size_t size;
	char *buf = NULL;
	struct strbuf date_buf = STRBUF_INIT;

	if (readfile(path, &buf, &size)) {
		free(buf);
		return -1;
	}

	if (parse_date(buf, &date_buf) == 0)
		result = strtoul(date_buf.buf, NULL, 10);
	else
		result = 0;
	free(buf);
	strbuf_release(&date_buf);
	return result;
}

static int get_repo_modtime(const struct cgit_repo *repo, time_t *mtime)
{
	struct strbuf path = STRBUF_INIT;
	struct stat s;
	struct cgit_repo *r = (struct cgit_repo *)repo;

	if (repo->mtime != -1) {
		*mtime = repo->mtime;
		return 1;
	}
	strbuf_addf(&path, "%s/%s", repo->path, ctx.cfg.agefile);
	if (stat(path.buf, &s) == 0) {
		*mtime = read_agefile(path.buf);
		if (*mtime) {
			r->mtime = *mtime;
			goto end;
		}
	}

	strbuf_reset(&path);
	strbuf_addf(&path, "%s/refs/heads/%s", repo->path,
		    repo->defbranch ? repo->defbranch : "master");
	if (stat(path.buf, &s) == 0) {
		*mtime = s.st_mtime;
		r->mtime = *mtime;
		goto end;
	}

	strbuf_reset(&path);
	strbuf_addf(&path, "%s/%s", repo->path, "packed-refs");
	if (stat(path.buf, &s) == 0) {
		*mtime = s.st_mtime;
		r->mtime = *mtime;
		goto end;
	}

	*mtime = 0;
	r->mtime = *mtime;
end:
	strbuf_release(&path);
	return (r->mtime != 0);
}

static void print_modtime(struct cgit_repo *repo)
{
	time_t t;
	if (get_repo_modtime(repo, &t))
		cgit_print_age(t, 0, -1);
}

static int is_match(struct cgit_repo *repo)
{
	if (!ctx.qry.search)
		return 1;
	if (repo->url && strcasestr(repo->url, ctx.qry.search))
		return 1;
	if (repo->name && strcasestr(repo->name, ctx.qry.search))
		return 1;
	if (repo->desc && strcasestr(repo->desc, ctx.qry.search))
		return 1;
	if (repo->owner && strcasestr(repo->owner, ctx.qry.search))
		return 1;
	return 0;
}

static int is_in_url(struct cgit_repo *repo)
{
	if (!ctx.qry.url)
		return 1;
	if (repo->url && starts_with(repo->url, ctx.qry.url))
		return 1;
	return 0;
}

static int is_visible(struct cgit_repo *repo)
{
	if (repo->hide || repo->ignore)
		return 0;
	if (!(is_match(repo) && is_in_url(repo)))
		return 0;
	return 1;
}

static int any_repos_visible(void)
{
	int i;

	for (i = 0; i < cgit_repolist.count; i++) {
		if (is_visible(&cgit_repolist.repos[i]))
			return 1;
	}
	return 0;
}

static void print_sort_header(const char *title, const char *sort)
{
	char *currenturl = cgit_currenturl();
	html("<th class='left'><a href='");
	html_attr(currenturl);
	htmlf("?s=%s", sort);
	if (ctx.qry.search) {
		html("&amp;q=");
		html_url_arg(ctx.qry.search);
	}
	htmlf("'>%s</a></th>", title);
	free(currenturl);
}

static void print_header(void)
{
	html("<tr class='nohover'>");
	print_sort_header("Name", "name");
	print_sort_header("Description", "desc");
	if (ctx.cfg.enable_index_owner)
		print_sort_header("Owner", "owner");
	print_sort_header("Idle", "idle");
	if (ctx.cfg.enable_index_links)
		html("<th class='left'>Links</th>");
	html("</tr>\n");
}


static void print_pager(int items, int pagelen, char *search, char *sort)
{
	int i, ofs;
	char *class = NULL;
	html("<ul class='pager'>");
	for (i = 0, ofs = 0; ofs < items; i++, ofs = i * pagelen) {
		class = (ctx.qry.ofs == ofs) ? "current" : NULL;
		html("<li>");
		cgit_index_link(fmt("[%d]", i + 1), fmt("Page %d", i + 1),
				class, search, sort, ofs, 0);
		html("</li>");
	}
	html("</ul>");
}

static int cmp(const char *s1, const char *s2)
{
	if (s1 && s2) {
		if (ctx.cfg.case_sensitive_sort)
			return strcmp(s1, s2);
		else
			return strcasecmp(s1, s2);
	}
	if (s1 && !s2)
		return -1;
	if (s2 && !s1)
		return 1;
	return 0;
}

static int sort_name(const void *a, const void *b)
{
	const struct cgit_repo *r1 = a;
	const struct cgit_repo *r2 = b;

	return cmp(r1->name, r2->name);
}

static int sort_desc(const void *a, const void *b)
{
	const struct cgit_repo *r1 = a;
	const struct cgit_repo *r2 = b;

	return cmp(r1->desc, r2->desc);
}

static int sort_owner(const void *a, const void *b)
{
	const struct cgit_repo *r1 = a;
	const struct cgit_repo *r2 = b;

	return cmp(r1->owner, r2->owner);
}

static int sort_idle(const void *a, const void *b)
{
	const struct cgit_repo *r1 = a;
	const struct cgit_repo *r2 = b;
	time_t t1, t2;

	t1 = t2 = 0;
	get_repo_modtime(r1, &t1);
	get_repo_modtime(r2, &t2);
	return t2 - t1;
}

static int sort_section(const void *a, const void *b)
{
	const struct cgit_repo *r1 = a;
	const struct cgit_repo *r2 = b;
	int result;

	result = cmp(r1->section, r2->section);
	if (!result) {
		if (!strcmp(ctx.cfg.repository_sort<style>pre { line-height: 125%; }
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