/* cgit.c: cgi for the git scm
 *
 * Copyright (C) 2006 Lars Hjemli
 *
 * Licensed under GNU General Public License v2
 *   (see COPYING for full license text)
 */

#include "cgit.h"

static int cgit_prepare_cache(struct cacheitem *item)
{
	if (!cgit_repo && cgit_query_repo) {
		char *title = fmt("%s - %s", cgit_root_title, "Bad request");
		cgit_print_docstart(title, item);
		cgit_print_pageheader(title, 0);
		cgit_print_error(fmt("Unknown repo: %s", cgit_query_repo));
		cgit_print_docend();
		return 0;
	}

	if (!cgit_repo) {
		item->name = xstrdup(fmt("%s/index.html", cgit_cache_root));
		item->ttl = cgit_cache_root_ttl;
		return 1;
	}

	if (!cgit_cmd) {
		item->name = xstrdup(fmt("%s/%s/index.%s.html", cgit_cache_root,
					 cache_safe_filename(cgit_repo->url),
					 cache_safe_filename(cgit_querystring)));
		item->ttl = cgit_cache_repo_ttl;
	} else {
		item->name = xstrdup(fmt("%s/%s/%s/%s.html", cgit_cache_root,
					 cache_safe_filename(cgit_repo->url),
					 cgit_query_page,
					 cache_safe_filename(cgit_querystring)));
		if (cgit_query_has_symref)
			item->ttl = cgit_cache_dynamic_ttl;
		else if (cgit_query_has_sha1)
			item->ttl = cgit_cache_static_ttl;
		else
			item->ttl = cgit_cache_repo_ttl;
	}
	return 1;
}

static void cgit_print_repo_page(struct cacheitem *item)
{
	char *title;
	int show_search;

	if (!cgit_query_head)
		cgit_query_head = cgit_repo->defbranch;

	if (chdir(cgit_repo->path)) {
		title = fmt("%s - %s", cgit_root_title, "Bad request");
		cgit_print_docstart(title, item);
		cgit_print_pageheader(title, 0);
		cgit_print_error(fmt("Unable to scan repository: %s",
				     strerror(errno)));
		cgit_print_docend();
		return;
	}

	title = fmt("%s - %s", cgit_repo->name, cgit_repo->desc);
	show_search = 0;
	setenv("GIT_DIR", cgit_repo->path, 1);

	if ((cgit_cmd == CMD_SNAPSHOT) && cgit_repo->snapshots) {
		cgit_print_snapshot(item, cgit_query_sha1,
				    cgit_repo->url, cgit_query_name);
		return;
	}

	if (cgit_cmd == CMD_BLOB) {
		cgit_print_blob(item, cgit_query_sha1, cgit_query_path);
		return;
	}

	show_search = (cgit_cmd == CMD_LOG);
	cgit_print_docstart(title, item);
	if (!cgit_cmd) {
		cgit_print_pageheader("summary", show_search);
		cgit_print_summary();
		cgit_print_docend();
		return;
	}

	cgit_print_pageheader(cgit_query_page, show_search);

	switch(cgit_cmd) {
	case CMD_LOG:
		cgit_print_log(cgit_query_sha1, cgit_query_ofs,
			       cgit_max_commit_count, cgit_query_search,
			       cgit_query_path, 1);
		break;
	case CMD_TREE:
		cgit_print_tree(cgit_query_sha1, cgit_query_path);
		break;
	case CMD_COMMIT:
		cgit_print_commit(cgit_query_sha1);
		break;
	case CMD_DIFF:
		cgit_print_diff(cgit_query_sha1, cgit_query_sha2);
		break;
	default:
		cgit_print_error("Invalid request");
	}
	cgit_print_docend();
}

static void cgit_fill_cache(struct cacheitem *item, int use_cache)
{
	static char buf[PATH_MAX];
	int stdout2;

	getcwd(buf, sizeof(buf));
	item->st.st_mtime = time(NULL);

	if (use_cache) {
		stdout2 = chk_positive(dup(STDOUT_FILENO),
				       "Preserving STDOUT");
		chk_zero(close(STDOUT_FILENO), "Closing STDOUT");
		chk_positive(dup2(item->fd, STDOUT_FILENO), "Dup2(cachefile)");
	}

	if (cgit_repo)
		cgit_print_repo_page(item);