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/* ui-shared.c: common web output functions
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"
#include "html.h"

const char cgit_doctype[] =
"<!DOCTYPE html PUBLIC \"-//W3C//DTD XHTML 1.0 Transitional//EN\"\n"
"  \"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd\">\n";

static char *http_date(time_t t)
{
	static char day[][4] =
		{"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"};
	static char month[][4] =
		{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
		 "Jul", "Aug", "Sep", "Oct", "Now", "Dec"};
	struct tm *tm = gmtime(&t);
	return fmt("%s, %02d %s %04d %02d:%02d:%02d GMT", day[tm->tm_wday],
		   tm->tm_mday, month[tm->tm_mon], 1900+tm->tm_year,
		   tm->tm_hour, tm->tm_min, tm->tm_sec);
}

void cgit_print_error(char *msg)
{
	html("<div class='error'>");
	html_txt(msg);
	html("</div>\n");
}

char *cgit_rooturl()
{
	if (ctx.cfg.virtual_root)
		return fmt("%s/", ctx.cfg.virtual_root);
	else
		return ctx.cfg.script_name;
}

char *cgit_repourl(const char *reponame)
{
	if (ctx.cfg.virtual_root) {
		return fmt("%s/%s/", ctx.cfg.virtual_root, reponame);
	} else {
		return fmt("?r=%s", reponame);
	}
}

char *cgit_fileurl(const char *reponame, const char *pagename,
		   const char *filename, const char *query)
{
	char *tmp;
	char *delim;

	if (ctx.cfg.virtual_root) {
		tmp = fmt("%s/%s/%s/%s", ctx.cfg.virtual_root, reponame,
			  pagename, (filename ? filename:""));
		delim = "?";
	} else {
		tmp = fmt("?url=%s/%s/%s", reponame, pagename,
			  (filename ? filename : ""));
		delim = "&";
	}
	if (query)
		tmp = fmt("%s%s%s", tmp, delim, query);
	return tmp;
}

char *cgit_pageurl(const char *reponame, const char *pagename,
		   const char *query)
{
	return cgit_fileurl(reponame,pagename,0,query);
}

const char *cgit_repobasename(const char *reponame)
{
	/* I assume we don't need to store more than one repo basename */
	static char rvbuf[1024];
	int p;
	const char *rv;
	strncpy(rvbuf,reponame,sizeof(rvbuf));
	if(rvbuf[sizeof(rvbuf)-1])
		die("cgit_repobasename: truncated repository name '%s'", reponame);
	p = strlen(rvbuf)-1;
	/* strip trailing slashes */
	while(p && rvbuf[p]=='/') rvbuf[p--]=0;
	/* strip trailing .git */
	if(p>=3 && !strncmp(&rvbuf[p-3],".git",4)) {
		p -= 3; rvbuf[p--] = 0;
	}
	/* strip more trailing slashes if any */
	while( p && rvbuf[p]=='/') rvbuf[p--]=0;
	/* find last slash in the remaining string */
	rv = strrchr(rvbuf,'/');
	if(rv)
		return ++rv;
	return rvbuf;
}

char *cgit_currurl()
{
	if (!ctx.cfg.virtual_root)
		return ctx.cfg.script_name;
	else if (ctx.qry.page)
		return fmt("%s/%s/%s/", ctx.cfg.virtual_root, ctx.qry.repo, ctx.qry.page);
	else if (ctx.qry.repo)
		return fmt("%s/%s/", ctx.cfg.virtual_root, ctx.qry.repo);
	else
		return fmt("%s/", ctx.cfg.virtual_root);
}

static char *repolink(char *title, char *class, char *page, char *head,
		      char *path)
{
	char *delim = "?";

	html("<a");
	if (title) {
		html(" title='");
		html_attr(title);
		html("'");
	}
	if (class) {
		html(" class='");
		html_attr(class);
		html("'");
	}
	html(" href='");
	if (ctx.cfg.virtual_root) {
		html_attr(ctx.cfg.virtual_root);
		if (ctx.cfg.virtual_root[strlen(ctx.cfg.virtual_root) - 1] != '/')
			html("/");
		html_attr(ctx.repo->url);
		if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
			html("/");
		if (page) {
			html(page);
			html("/");
			if (path)
				html_attr(path);
		}
	} else {
		html(ctx.cfg.script_name);
		html("?url=");
		html_attr(ctx.repo->url);
		if (ctx.repo->url[strlen(ctx.repo->url) - 1] != '/')
			html("/");
		if (page) {
			html(page);
			html("/");
			if (path)
				html_attr(path);
		}
		delim = "&amp;";
	}
	if (head && strcmp(head, ctx.repo->defbranch)) {
		html(delim);
		html("h=");
		html_attr(head);
		delim = "&amp;";
	}
	return fmt("%s", delim);
}

static void reporevlink(char *page, char *name, char *title, char *class,
			char *head, char *rev, char *path)
{
	char *delim;

	delim = repolink(title, class, page, head, path);
	if (rev && strcmp(rev, ctx.qry.head)) {
		html(delim);
		html("id=");
		html_attr(rev);
	}
	html("'>");
	html_txt(name);
	html("</a>");
}

void cgit_tree_link(char *name, char *title, char *class, char *head,
		    char *rev, char *path)
{
	reporevlink("tree", name, title, class, head, rev, path);
}

void cgit_log_link(char *name, char *title, char *class, char *head,
		   char *rev, char *path, int ofs, char *grep, char *pattern)
{
	char *delim;

	delim = repolink(title, class, "log", head, path);
	if (rev && strcmp(rev, ctx.qry.head)) {
		html(delim);
		html("id=");
		html_attr(rev);
		delim = "&";
	}
	if (grep && pattern) {
		html(delim);
		html("qt=");
		html_attr(grep);
		delim = "&";
		html(delim);
		html("q=");
		html_attr(pattern);
	}
	if (ofs > 0) {
		html(delim);
		html("ofs=");
		htmlf("%d", ofs);
	}
	html("'>");
	html_txt(name);
	html("</a>");
}

void cgit_commit_link(char *name, char *title, char *class, char *head,
		      char *rev)
{
	if (strlen(name) > ctx.cfg.max_msg_len && ctx.cfg.max_msg_len >= 15) {
		name[ctx.cfg.max_msg_len] = '\0';
		name[ctx.cfg.max_msg_len - 1] = '.';
		name[ctx.cfg.max_msg_len - 2] = '.';
		name[ctx.cfg.max_msg_len - 3] = '.';
	}
	reporevlink("commit", name, title, class, head, rev, NULL);
}

void cgit_refs_link(char *name, char *title, char *class, char *head,
		    char *rev, char *path)
{
	reporevlink("refs", name, title, class, head, rev, path);
}

void cgit_snapshot_link(char *name, char *title, char *class, char *head,
			char *rev, char *archivename)
{
	reporevlink("snapshot", name, title, class, head, rev, archivename);
}

void cgit_diff_link(char *name, char *title, char *class, char *head,
		    char *new_rev, char *old_rev, char *path)
{
	char *delim;

	delim = repolink(title, class, "diff", head, path);
	if (new_rev && strcmp(new_rev, ctx.qry.head)) {
		html(delim);
		html("id=");
		html_attr(new_rev);
		delim = "&amp;";
	}
	if (old_rev) {
		html(delim);
		html("id2=");
		html_attr(old_rev);
	}
	html("'>");
	html_txt(name);
	html("</a>");
}

void cgit_patch_link(char *name, char *title, char *class, char *head,
		     char *rev)
{
	reporevlink("patch", name, title, class, head, rev, NULL);
}

void cgit_object_link(struct object *obj)
{
	char *page, *arg, *url;

	if (obj->type == OBJ_COMMIT) {
                cgit_commit_link(fmt("commit %s", sha1_to_hex(obj->sha1)), NULL, NULL,
				 ctx.qry.head, sha1_to_hex(obj->sha1));
		return;
	} else if (obj->type == OBJ_TREE) {
		page = "tree";
		arg = "id";
	} else if (obj->type == OBJ_TAG) {
		page = "tag";
		arg = "id";
	} else {
		page = "blob";
		arg = "id";
	}

	url = cgit_pageurl(ctx.qry.repo, page,
			   fmt("%s=%s", arg, sha1_to_hex(obj->sha1)));
	html_link_open(url, NULL, NULL);
	htmlf("%s %s", typename(obj->type),
	      sha1_to_hex(obj->sha1));
	html_link_close();
}

void cgit_print_date(time_t secs, char *format)
{
	char buf[64];
	struct tm *time;

	if (!secs)
		return;
	time = gmtime(&secs);
	strftime(buf, sizeof(buf)-1, format, time);
	html_txt(buf);
}

void cgit_print_age(time_t t, time_t max_relative, char *format)
{
	time_t now, secs;

	if (!t)
		return;
	time(&now);
	secs = now - t;

	if (secs > max_relative && max_relative >= 0) {
		cgit_print_date(t, format);
		return;
	}

	if (secs < TM_HOUR * 2) {
		htmlf("<span class='age-mins'>%.0f min.</span>",
		      secs * 1.0 / TM_MIN);
		return;
	}
	if (secs < TM_DAY * 2) {
		htmlf("<span class='age-hours'>%.0f hours</span>",
		      secs * 1.0 / TM_HOUR);
		return;
	}
	if (secs < TM_WEEK * 2) {
		htmlf("<span class='age-days'>%.0f days</span>",
		      secs * 1.0 / TM_DAY);
		return;
	}
	if (secs < TM_MONTH * 2) {
		htmlf("<span class='age-weeks'>%.0f weeks</span>",
		      secs * 1.0 / TM_WEEK);
		return;
	}
	if (secs < TM_YEAR * 2) {
		htmlf("<span class='age-months'>%.0f months</span>",
		      secs * 1.0 / TM_MONTH);
		return;
	}
	htmlf("<span class='age-years'>%.0f years</span>",
	      secs * 1.0 / TM_YEAR);
}

void cgit_print_http_headers(struct cgit_context *ctx)
{
	if (ctx->page.mimetype && ctx->page.charset)
		htmlf("Content-Type: %s; charset=%s\n", ctx->page.mimetype,
		      ctx->page.charset);
	else if (ctx->page.mimetype)
		htmlf("Content-Type: %s\n", ctx->page.mimetype);
	if (ctx->page.filename)
		htmlf("Content-Disposition: inline; filename=\"%s\"\n",
		      ctx->page.filename);
	htmlf("Last-Modified: %s\n", http_date(ctx->page.modified));
	htmlf("Expires: %s\n", http_date(ctx->page.expires));
	html("\n");
}

void cgit_print_docstart(struct cgit_context *ctx)
{
	html(cgit_doctype);
	html("<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>\n");
	html("<head>\n");
	html("<title>");
	html_txt(ctx->page.title);
	html("</title>\n");
	htmlf("<meta name='generator' content='cgit %s'/>\n", cgit_version);
	if (ctx->cfg.robots && *ctx->cfg.robots)
		htmlf("<meta name='robots' content='%s'/>\n", ctx->cfg.robots);
	html("<link rel='stylesheet' type='text/css' href='");
	html_attr(ctx->cfg.css);
	html("'/>\n");
	html("</head>\n");
	html("<body>\n");
}

void cgit_print_docend()
{
	html("</td>\n</tr>\n</table>\n</body>\n</html>\n");
}

int print_branch_option(const char *refname, const unsigned char *sha1,
			int flags, void *cb_data)
{
	char *name = (char *)refname;
	html_option(name, name, ctx.qry.head);
	return 0;
}

int print_archive_ref(const char *refname, const unsigned char *sha1,
		       int flags, void *cb_data)
{
	struct tag *tag;
	struct taginfo *info;
	struct object *obj;
	char buf[256], *url;
	unsigned char fileid[20];
	int *header = (int *)cb_data;

	if (prefixcmp(refname, "refs/archives"))
		return 0;
	strncpy(buf, refname+14, sizeof(buf));
	obj = parse_object(sha1);
	if (!obj)
		return 1;
	if (obj->type == OBJ_TAG) {
		tag = lookup_tag(sha1);
		if (!tag || parse_tag(tag) || !(info = cgit_parse_tag(tag)))
			return 0;
		hashcpy(fileid, tag->tagged->sha1);
	} else if (obj->type != OBJ_BLOB) {
		return 0;
	} else {
		hashcpy(fileid, sha1);
	}
	if (!*header) {
		html("<h1>download</h1>\n");
		*header = 1;
	}
	url = cgit_pageurl(ctx.qry.repo, "blob",
			   fmt("id=%s&amp;path=%s", sha1_to_hex(fileid),
			       buf));
	html_link_open(url, NULL, "menu");
	html_txt(strlpart(buf, 20));
	html_link_close();
	return 0;
}

void add_hidden_formfields(int incl_head, int incl_search, char *page)
{
	char *url;

	if (!ctx.cfg.virtual_root) {
		url = fmt("%s/%s", ctx.qry.repo, page);
		if (ctx.qry.path)
			url = fmt("%s/%s", url, ctx.qry.path);
		html_hidden("url", url);
	}

	if (incl_head && strcmp(ctx.qry.head, ctx.repo->defbranch))
		html_hidden("h", ctx.qry.head);

	if (ctx.qry.sha1)
		html_hidden("id", ctx.qry.sha1);
	if (ctx.qry.sha2)
		html_hidden("id2", ctx.qry.sha2);

	if (incl_search) {
		if (ctx.qry.grep)
			html_hidden("qt", ctx.qry.grep);
		if (ctx.qry.search)
			html_hidden("q", ctx.qry.search);
	}
}

void cgit_print_pageheader(struct cgit_context *ctx)
{
	static const char *default_info = "This is cgit, a fast webinterface for git repositories";
	int header = 0;
	char *url;

	html("<table id='layout' summary=''>\n");
	html("<tr><td id='sidebar'>\n");
	html("<table class='sidebar' cellspacing='0' summary=''>\n");
	html("<tr><td class='sidebar'>\n<a href='");
	html_attr(cgit_rooturl());
	htmlf("'><img src='%s' alt='cgit'/></a>\n",
	      ctx->cfg.logo);
	html("</td></tr>\n<tr><td class='sidebar'>\n");
	if (ctx->repo) {
		html("<h1 class='first'>");
		html_txt(strrpart(ctx->repo->name, 20));
		html("</h1>\n");
		html_txt(ctx->repo->desc);
		if (ctx->repo->owner) {
			html("<h1>owner</h1>\n");
			html_txt(ctx->repo->owner);
		}
		html("<h1>navigate</h1>\n");
		reporevlink(NULL, "summary", NULL, "menu", ctx->qry.head,
			    NULL, NULL);
		cgit_log_link("log", NULL, "menu", ctx->qry.head, NULL, NULL,
			      0, NULL, NULL);
		cgit_tree_link("tree", NULL, "menu", ctx->qry.head,
			       ctx->qry.sha1, NULL);
		cgit_commit_link("commit", NULL, "menu", ctx->qry.head,
			      ctx->qry.sha1);
		cgit_diff_link("diff", NULL, "menu", ctx->qry.head,
			       ctx->qry.sha1, ctx->qry.sha2, NULL);
		cgit_patch_link("patch", NULL, "menu", ctx->qry.head,
				ctx->qry.sha1);

		for_each_ref(print_archive_ref, &header);

		if (ctx->repo->clone_url || ctx->cfg.clone_prefix) {
			html("<h1>clone</h1>\n");
			if (ctx->repo->clone_url)
				url = ctx->repo->clone_url;
			else
				url = fmt("%s%s", ctx->cfg.clone_prefix,
					  ctx->repo->url);
			html("<a class='menu' href='");
			html_attr(url);
			html("' title='");
			html_attr(url);
			html("'>\n");
			html_txt(strrpart(url, 20));
			html("</a>\n");
		}

		html("<h1>branch</h1>\n");
		html("<form method='get' action=''>\n");
		add_hidden_formfields(0, 1, ctx->qry.page);
//		html("<table summary='branch selector' class='grid'><tr><td id='branch-dropdown-cell'>");
		html("<select name='h' onchange='this.form.submit();'>\n");
		for_each_branch_ref(print_branch_option, ctx->qry.head);
		html("</select>\n");
//		html("</td><td>");
		html("<noscript><input type='submit' id='switch-btn' value='switch'/></noscript>\n");
//		html("</td></tr></table>");
		html("</form>\n");

		html("<h1>search</h1>\n");
		html("<form method='get' action='");
		if (ctx->cfg.virtual_root)
			html_attr(cgit_fileurl(ctx->qry.repo, "log",
					       ctx->qry.path, NULL));
		html("'>\n");
		add_hidden_formfields(1, 0, "log");
		html("<select name='qt'>\n");
		html_option("grep", "log msg", ctx->qry.grep);
		html_option("author", "author", ctx->qry.grep);
		html_option("committer", "committer", ctx->qry.grep);
		html("</select>\n");
		html("<input class='txt' type='text' name='q' value='");
		html_attr(ctx->qry.search);
		html("'/>\n");
		html("</form>\n");
	} else {
		if (!ctx->cfg.index_info || html_include(ctx->cfg.index_info))
			html(default_info);
	}

	html("</td></tr></table></td>\n");

	html("<td id='content'>\n");
}

void cgit_print_filemode(unsigned short mode)
{
	if (S_ISDIR(mode))
		html("d");
	else if (S_ISLNK(mode))
		html("l");
	else if (S_ISGITLINK(mode))
		html("m");
	else
		html("-");
	html_fileperm(mode >> 6);
	html_fileperm(mode >> 3);
	html_fileperm(mode);
}

void cgit_print_snapshot_links(const char *repo, const char *head,
			       const char *hex, int snapshots)
{
	const struct cgit_snapshot_format* f;
    	char *filename;

	for (f = cgit_snapshot_formats; f->suffix; f++) {
		if (!(snapshots & f->bit))
			continue;
		filename = fmt("%s-%s%s", cgit_repobasename(repo), hex,
			       f->suffix);
		cgit_snapshot_link(filename, NULL, NULL, (char *)head,
				   (char *)hex, filename);
		html("<br/>");
	}
}