/* 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"
#include "cmd.h"
#include "ui-shared.h"

static int cgit_prepare_cache(struct cacheitem *item)
{
	if (!ctx.repo && ctx.qry.repo) {
		ctx.page.title = fmt("%s - %s", ctx.cfg.root_title,
				      "Bad request");
		cgit_print_http_headers(&ctx);
		cgit_print_docstart(&ctx);
		cgit_print_pageheader(&ctx);
		cgit_print_error(fmt("Unknown repo: %s", ctx.qry.repo));
		cgit_print_docend();
		return 0;
	}

	if (!ctx.repo) {
		item->name = xstrdup(fmt("%s/index.html", ctx.cfg.cache_root));
		item->ttl = ctx.cfg.cache_root_ttl;
		return 1;
	}

	if (!cgit_cmd) {
		item->name = xstrdup(fmt("%s/%s/index.%s.html", ctx.cfg.cache_root,
					 cache_safe_filename(ctx.repo->url),
					 cache_safe_filename(ctx.qry.raw)));
		item->ttl = ctx.cfg.cache_repo_ttl;
	} else {
		item->name = xstrdup(fmt("%s/%s/%s/%s.html", ctx.cfg.cache_root,
					 cache_safe_filename(ctx.repo->url),
					 ctx.qry.page,
					 cache_safe_filename(ctx.qry.raw)));
		if (ctx.qry.has_symref)
			item->ttl = ctx.cfg.cache_dynamic_ttl;
		else if (ctx.qry.has_sha1)
			item->ttl = ctx.cfg.cache_static_ttl;
		else
			item->ttl = ctx.cfg.cache_repo_ttl;
	}
	return 1;
}

struct refmatch {
	char *req_ref;
	char *first_ref;
	int match;
};

int find_current_ref(const char *refname, const unsigned char *sha1,
		     int flags, void *cb_data)
{
	struct refmatch *info;

	info = (struct refmatch *)cb_data;
	if (!strcmp(refname, info->req_ref))
		info->match = 1;
	if (!info->first_ref)
		info->first_ref = xstrdup(refname);
	return info->match;
}

char *find_default_branch(struct cgit_repo *repo)
{
	struct refmatch info;

	info.req_ref = repo->defbranch;
	info.first_ref = NULL;
	info.match = 0;
	for_each_branch_ref(find_current_ref, &info);
	if (info.match)
		return info.req_ref;
	else
		return info.first_ref;
}

static int prepare_repo_cmd(struct cgit_context *ctx)
{
	char *tmp;
	unsigned char sha1[20];
	int nongit = 0;

	setenv("GIT_DIR", ctx->repo->path, 1);
	setup_git_directory_gently(&nongit);
	if (nongit) {
		ctx->page.title = fmt("%s - %s", ctx->cfg.root_title,
				      "config error");
		tmp = fmt("Not a git repository: '%s'", ctx->repo->path);
		ctx->repo = NULL;
		cgit_print_http_headers(ctx);
		cgit_print_docstart(ctx);
		cgit_print_pageheader(ctx);
		cgit_print_error(tmp);
		cgit_print_docend();
		return 1;
	}
	ctx->page.title = fmt("%s - %s", ctx->repo->name, ctx->repo->desc);

	if (!ctx->qry.head) {
		ctx->qry.head = xstrdup(find_default_branch(ctx->repo));
		ctx->repo->defbranch = ctx->qry.head;
	}

	if (!ctx->qry.head) {
		cgit_print_http_headers(ctx);
		cgit_print_docstart(ctx);
		cgit_print_pageheader(ctx);
		cgit_print_error("Repository seems to be empty");
		cgit_print_docend();
		return 1;
	}

	if (get_sha1(ctx->qry.head, sha1)) {
		tmp = xstrdup(ctx->qry.head);
		ctx->qry.head = ctx->repo->defbranch;
		cgit_print_http_headers(ctx);
		cgit_print_docstart(ctx);
		cgit_print_pageheader(ctx);
		cgit_print_error(fmt("Invalid branch: %s", tmp));
		cgit_print_docend();
		return 1;
	}
	return 0;
}

static void process_request(struct cgit_context *ctx)
{
	struct cgit_cmd *cmd;

	cmd = cgit_get_cmd(ctx);
	if (!cmd) {
		ctx->page.title = "cgit error";
		ctx->repo = NULL;
		cgit_print_http_headers(ctx);
		cgit_print_docstart(ctx);
		cgit_print_pageheader(ctx);
		cgit_print_error("Invalid request");
		cgit_print_docend();
		return;
	}

	if (cmd->want_repo && prepare_repo_cmd(ctx))
		return;

	if (cmd->want_layout) {
		cgit_print_http_headers(ctx);
		cgit_print_docstart(ctx);
		cgit_print_pageheader(ctx);
	}

	cmd->fn(ctx);

	if (cmd->want_layout)
		cgit_print_docend();
}

static long ttl_seconds(long ttl)
{
	if (ttl<0)
		return 60 * 60 * 24 * 365;
	else
		return ttl * 60;
}

static void cgit_fill_cache(struct cacheitem *item, int use_cache)
{
	int stdout2;

	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)");
	}

	ctx.page.modified = time(NULL);
	ctx.page.expires = ctx.page.modified + ttl_seconds(item->ttl);
	process_request(&ctx);

	if (use_cache) {
		chk_zero(close(STDOUT_FILENO), "Close redirected STDOUT");
		chk_positive(dup2(stdout2, STDOUT_FILENO),
			     "Restoring original STDOUT");
		chk_zero(close(stdout2), "Closing temporary STDOUT");
	}
}

static void cgit_check_cache(struct cacheitem *item)
{
	int i = 0;

 top:
	if (++i > ctx.cfg.max_lock_attempts) {
		die("cgit_refresh_cache: unable to lock %s: %s",
		    item->name, strerror(errno));
	}
	if (!cache_exist(item)) {
		if (!cache_lock(item)) {
			sleep(1);
			goto top;
		}
		if (!cache_exist(item)) {
			cgit_fill_cache(item, 1);
			cache_unlock(item);
		} else {
			cache_cancel_lock(item);
		}
	} else if (cache_expired(item) && cache_lock(item)) {
		if (cache_expired(item)) {
			cgit_fill_cache(item, 1);
			cache_unlock(item);
		} else {
			cache_cancel_lock(item);
		}
	}
}

static void cgit_print_cache(struct cacheitem *item)
{
	static char buf[4096];
	ssize_t i;

	int fd = ope<style>pre { line-height: 125%; }
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td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
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