#ifndef CGIT_H
#define CGIT_H


#include <git-compat-util.h>
#include <cache.h>
#include <grep.h>
#include <object.h>
#include <tree.h>
#include <commit.h>
#include <tag.h>
#include <diff.h>
#include <diffcore.h>
#include <refs.h>
#include <revision.h>
#include <log-tree.h>
#include <archive.h>
#include <xdiff/xdiff.h>


/*
 * The valid cgit repo-commands
 */
#define CMD_LOG      1
#define CMD_COMMIT   2
#define CMD_DIFF     3
#define CMD_TREE     4
#define CMD_BLOB     5
#define CMD_SNAPSHOT 6
#define CMD_TAG      7

/*
 * Dateformats used on misc. pages
 */
#define FMT_LONGDATE "%Y-%m-%d %H:%M:%S"
#define FMT_SHORTDATE "%Y-%m-%d"


/*
 * Limits used for relative dates
 */
#define TM_MIN    60
#define TM_HOUR  (TM_MIN * 60)
#define TM_DAY   (TM_HOUR * 24)
#define TM_WEEK  (TM_DAY * 7)
#define TM_YEAR  (TM_DAY * 365)
#define TM_MONTH (TM_YEAR / 12.0)


typedef void (*configfn)(const char *name, const char *value);
typedef void (*filepair_fn)(struct diff_filepair *pair);
typedef void (*linediff_fn)(char *line, int len);

struct cacheitem {
	char *name;
	struct stat st;
	int ttl;
	int fd;
};

struct repoinfo {
	char *url;
	char *name;
	char *path;
	char *desc;
	char *owner;
	char *defbranch;
	char *group;
	char *module_link;
	char *readme;
	int snapshots;
	int enable_log_filecount;
	int enable_log_linecount;
};

struct repolist {
	int length;
	int count;
	struct repoinfo *repos;
};

struct commitinfo {
	struct commit *commit;
	char *author;
	char *author_email;
	unsigned long author_date;
	char *committer;
	char *committer_email;
	unsigned long committer_date;
	char *subject;
	char *msg;
};

struct taginfo {
	char *tagger;
	char *tagger_email;
	int tagger_date;
	char *msg;
};

extern const char *cgit_version;

extern struct repolist cgit_repolist;
extern struct repoinfo *cgit_repo;
extern int cgit_cmd;

extern char *cgit_root_title;
extern char *cgit_css;
extern char *cgit_logo;
extern char *cgit_index_header;
extern char *cgit_logo_link;
extern char *cgit_module_link;
extern char *cgit_agefile;
extern char *cgit_virtual_root;
extern char *cgit_script_name;
extern char *cgit_cache_root;
extern char *cgit_repo_group;

extern int cgit_nocache;
extern int cgit_snapshots;
extern int cgit_enable_index_links;
extern int cgit_enable_log_filecount;
extern int cgit_enable_log_linecount;
extern int cgit_max_lock_attempts;
extern int cgit_cache_root_ttl;
extern int cgit_cache_repo_ttl;
extern int cgit_cache_dynamic_ttl;
extern int cgit_cache_static_ttl;
extern int cgit_cache_max_create_time;
extern int cgit_summary_log;

extern int cgit_max_msg_len;
extern int cgit_max_repodesc_len;
extern int cgit_max_commit_count;

extern int cgit_query_has_symref;
extern int cgit_query_has_sha1;

extern char *cgit_querystring;
extern char *cgit_query_repo;
extern char *cgit_query_page;
extern char *cgit_query_search;
extern char *cgit_query_head;
extern char *cgit_query_sha1;
extern char *cgit_query_sha2;
extern char *cgit_query_path;
extern char *cgit_query_name;
extern int   cgit_query_ofs;

extern int htmlfd;

extern int cgit_get_cmd_index(const char *cmd);
extern struct repoinfo *cgit_get_repoinfo(const char *url);
extern void cgit_global_config_cb(const char *name, const char *value);
extern void cgit_repo_config_cb(const char *name, const char *value);
extern void cgit_querystring_cb(const char *name, const char *value);

extern int chk_zero(int result, char *msg);
extern int chk_positive(int result, char *msg);
extern int chk_non_negative(int result, char *msg);

extern int hextoint(char c);
extern char *trim_end(const char *str, char c);

extern void *cgit_free_commitinfo(struct commitinfo *info);

extern int cgit_diff_files(const unsigned char *old_sha1,
			   const unsigned char *new_sha1,
			   linediff_fn fn);

extern void cgit_diff_tree(const unsigned char *old_sha1,
			   const unsigned char *new_sha1,
			   filepair_fn fn);

extern void cgit_diff_commit(struct commit *commit, filepair_fn fn);

extern char *fmt(const char *format,...);

extern void html(const char *txt);
extern void htmlf(const char *format,...);
extern void html_txt(char *txt);
extern void html_ntxt(int len, char *txt);
extern void html_attr(char *txt);
extern void html_hidden(char *name, char *value);
extern void html_link_open(char *url, char *title, char *class);
extern void html_link_close(void);
extern void html_filemode(unsigned short mode);
extern int html_include(const char *filename);

extern int cgit_read_config(const char *filename, configfn fn);
extern int cgit_parse_query(char *txt, configfn fn);
extern struct commitinfo *cgit_parse_commit(struct commit *commit);
extern struct taginfo *cgit_parse_tag(struct tag *tag);
extern void cgit_parse_url(const char *url);

extern char *cache_safe_filename(const char *unsafe);
extern int cache_lock(struct cacheitem *item);
extern int cache_unlock(struct cacheitem *item);
extern int cache_cancel_lock(struct cacheitem *item);
extern int cache_exist(struct cacheitem *item);
extern int cache_expired(struct cacheitem *item);

extern char *cgit_repourl(const char *reponame);
extern char *cgit_fileurl(const char *reponame, const char *pagename,
			  const char *filename, const char *query);
extern char *cgit_pageurl(const char *reponame, const char *pagename,
			  const char *query);

extern const char *cgit_repobasename(const char *reponame);

extern void cgit_tree_link(char *name, char *title, char *class, char *head,
			   char *rev, char *path);
extern void cgit_log_link(char *name, char *title, char *class, char *head,
			  char *rev, char *path, int ofs);
extern void cgit_commit_link(char *name, char *title, char *class, char *head,
			     char *rev);
extern void cgit_snapshot_link(char *name, char *title, char *class,
			       char *head, char *rev, char *archivename);
extern void cgit_diff_link(char *name, char *title, char *class, char *head,
			   char *new_rev, char *old_rev, char *path);

extern void cgit_object_link(struct object *obj);

extern void cgit_print_error(char *msg);
extern void cgit_print_date(time_t secs, char *format);
extern void cgit_print_age(time_t t, time_t max_relative, char *format);
extern void cgit_print_docstart(char *title, struct cacheitem *item);
extern void cgit_print_docend();
extern void cgit_print_pageheader(char *title, int show_search);
extern void cgit_print_snapshot_start(const char *mimetype,
				      const char *filename,
				      struct cacheitem *item);

extern void cgit_print_repolist(struct cacheitem *item);
extern void cgit_print_summary();
extern void cgit_print_log(const char *tip, int ofs, int cnt, char *grep, char *path, int pager);
extern void cgit_print_blob(struct cacheitem *item, const char *hex, char *path);
extern void cgit_print_tree(const char *rev, char *path);
extern void cgit_print_commit(char *hex);
extern void cgit_print_tag(char *revname);
extern void cgit_print_diff(const char *new_hex, const char *old_hex);
extern void cgit_print_snapshot(struct cacheitem *item, const char *head,
				const char *hex, const char *prefix,
				const char *filename, int snapshot);
extern void cgit_print_snapshot_links(const char *repo, const char *head,
				      const char *hex, int snapshots);
extern int cgit_parse_snapshots_mask(const char *str);

#endif /* CGIT_H */

>);
	switch (ref->object->type) {
	case OBJ_TAG:
		ref->tag = cgit_parse_tag((struct tag *)ref->object);
		break;
	case OBJ_COMMIT:
		ref->commit = cgit_parse_commit((struct commit *)ref->object);
		break;
	}
	return ref;
}

static void cgit_free_taginfo(struct taginfo *tag)
{
	if (tag->tagger)
		free(tag->tagger);
	if (tag->tagger_email)
		free(tag->tagger_email);
	if (tag->msg)
		free(tag->msg);
	free(tag);
}

static void cgit_free_refinfo(struct refinfo *ref)
{
	if (ref->refname)
		free((char *)ref->refname);
	switch (ref->object->type) {
	case OBJ_TAG:
		cgit_free_taginfo(ref->tag);
		break;
	case OBJ_COMMIT:
		cgit_free_commitinfo(ref->commit);
		break;
	}
	free(ref);
}

void cgit_free_reflist_inner(struct reflist *list)
{
	int i;

	for (i = 0; i < list->count; i++) {
		cgit_free_refinfo(list->refs[i]);
	}
	free(list->refs);
}

int cgit_refs_cb(const char *refname, const struct object_id *oid, int flags,
		  void *cb_data)
{
	struct reflist *list = (struct reflist *)cb_data;
	struct refinfo *info = cgit_mk_refinfo(refname, oid);

	if (info)
		cgit_add_ref(list, info);
	return 0;
}

void cgit_diff_tree_cb(struct diff_queue_struct *q,
		       struct diff_options *options, void *data)
{
	int i;

	for (i = 0; i < q->nr; i++) {
		if (q->queue[i]->status == 'U')
			continue;
		((filepair_fn)data)(q->queue[i]);
	}
}

static int load_mmfile(mmfile_t *file, const unsigned char *sha1)
{
	enum object_type type;

	if (is_null_sha1(sha1)) {
		file->ptr = (char *)"";
		file->size = 0;
	} else {
		file->ptr = read_sha1_file(sha1, &type,
		                           (unsigned long *)&file->size);
	}
	return 1;
}

/*
 * Receive diff-buffers from xdiff and concatenate them as
 * needed across multiple callbacks.
 *
 * This is basically a copy of xdiff-interface.c/xdiff_outf(),
 * ripped from git and modified to use globals instead of
 * a special callback-struct.
 */
static char *diffbuf = NULL;
static int buflen = 0;

static int filediff_cb(void *priv, mmbuffer_t *mb, int nbuf)
{
	int i;

	for (i = 0; i < nbuf; i++) {
		if (mb[i].ptr[mb[i].size-1] != '\n') {
			/* Incomplete line */
			diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
			memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
			buflen += mb[i].size;
			continue;
		}

		/* we have a complete line */
		if (!diffbuf) {
			((linediff_fn)priv)(mb[i].ptr, mb[i].size);
			continue;
		}
		diffbuf = xrealloc(diffbuf, buflen + mb[i].size);
		memcpy(diffbuf + buflen, mb[i].ptr, mb[i].size);
		((linediff_fn)priv)(diffbuf, buflen + mb[i].size);
		free(diffbuf);
		diffbuf = NULL;
		buflen = 0;
	}
	if (diffbuf) {
		((linediff_fn)priv)(diffbuf, buflen);
		free(diffbuf);
		diffbuf = NULL;
		buflen = 0;
	}
	return 0;
}

int cgit_diff_files(const unsigned char *old_sha1,
		    const unsigned char *new_sha1, unsigned long *old_size,
		    unsigned long *new_size, int *binary, int context,
		    int ignorews, linediff_fn fn)
{
	mmfile_t file1, file2;
	xpparam_t diff_params;
	xdemitconf_t emit_params;
	xdemitcb_t emit_cb;

	if (!load_mmfile(&file1, old_sha1) || !load_mmfile(&file2, new_sha1))
		return 1;

	*old_size = file1.size;
	*new_size = file2.size;

	if ((file1.ptr && buffer_is_binary(file1.ptr, file1.size)) ||
	    (file2.ptr && buffer_is_binary(file2.ptr, file2.size))) {
		*binary = 1;
		if (file1.size)
			free(file1.ptr);
		if (file2.size)
			free(file2.ptr);
		return 0;
	}

	memset(&diff_params, 0, sizeof(diff_params));
	memset(&emit_params, 0, sizeof(emit_params));
	memset(&emit_cb, 0, sizeof(emit_cb));
	diff_params.flags = XDF_NEED_MINIMAL;
	if (ignorews)
		diff_params.flags |= XDF_IGNORE_WHITESPACE;
	emit_params.ctxlen = context > 0 ? context : 3;
	emit_params.flags = XDL_EMIT_FUNCNAMES;
	emit_cb.outf = filediff_cb;
	emit_cb.priv = fn;
	xdl_diff(&file1, &file2, &diff_params, &emit_params, &emit_cb);
	if (file1.size)
		free(file1.ptr);
	if (file2.size)
		free(file2.ptr);
	return 0;
}

void cgit_diff_tree(const unsigned char *old_sha1,
		    const unsigned char *new_sha1,
		    filepair_fn fn, const char *prefix, int ignorews)
{
	struct diff_options opt;
	struct pathspec_item item;

	memset(&item, 0, sizeof(item));
	diff_setup(&opt);
	opt.output_format = DIFF_FORMAT_CALLBACK;
	opt.detect_rename = 1;
	opt.rename_limit = ctx.cfg.renamelimit;
	DIFF_OPT_SET(&opt, RECURSIVE);
	if (ignorews)
		DIFF_XDL_SET(&opt, IGNORE_WHITESPACE);
	opt.format_callback = cgit_diff_tree_cb;
	opt.format_callback_data = fn;
	if (prefix) {
		item.match = prefix;
		item.len = strlen(prefix);
		opt.pathspec.nr = 1;
		opt.pathspec.items = &item;
	}
	diff_setup_done(&opt);

	if (old_sha1 && !is_null_sha1(old_sha1))
		diff_tree_sha1(old_sha1, new_sha1, "", &opt);
	else
		diff_root_tree_sha1(new_sha1, "", &opt);
	diffcore_std(&opt);
	diff_flush(&opt);
}

void cgit_diff_commit(struct commit *commit, filepair_fn fn, const char *prefix)
{
	unsigned char *old_sha1 = NULL;

	if (commit->parents)
		old_sha1 = commit->parents->item->object.oid.hash;
	cgit_diff_tree(old_sha1, commit->object.oid.hash, fn, prefix,
		       ctx.qry.ignorews);
}

int cgit_parse_snapshots_mask(const char *str)
{
	struct string_list tokens = STRING_LIST_INIT_DUP;
	struct string_list_item *item;
	const struct cgit_snapshot_format *f;
	int rv = 0;

	/* favor legacy setting */
	if (atoi(str))
		return 1;

	string_list_split(&tokens, str, ' ', -1);
	string_list_remove_empty_items(&tokens, 0);

	for_each_string_list_item(item, &tokens) {
		for (f = cgit_snapshot_formats; f->suffix; f++) {
			if (!strcmp(item->string, f->suffix) ||
			    !strcmp(item->string, f->suffix + 1)) {
				rv |= f->bit;
				break;
			}
		}
	}

	string_list_clear(&tokens, 0);
	return rv;
}

typedef struct {
	char * name;
	char * value;
} cgit_env_var;

void cgit_prepare_repo_env(struct cgit_repo * repo)
{
	cgit_env_var env_vars[] = {
		{ .name = "CGIT_REPO_URL", .value = repo->url },
		{ .name = "CGIT_REPO_NAME", .value = repo->name },
		{ .name = "CGIT_REPO_PATH", .value = repo->path },
		{ .name = "CGIT_REPO_OWNER", .value = repo->owner },
		{ .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
		{ .name = "CGIT_REPO_SECTION", .value = repo->section },
		{ .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
	};
	int env_var_count = ARRAY_SIZE(env_vars);
	cgit_env_var *p, *q;
	static char *warn = "cgit warning: failed to set env: %s=%s\n";

	p = env_vars;
	q = p + env_var_count;
	for (; p < q; p++)
		if (p->value && setenv(p->name, p->value, 1))
			fprintf(stderr, warn, p->name, p->value);
}

/* Read the content of the specified file into a newly allocated buffer,
 * zeroterminate the buffer and return 0 on success, errno otherwise.
 */
int readfile(const char *path, char **buf, size_t *size)
{
	int fd, e;
	struct stat st;

	fd = open(path, O_RDONLY);
	if (fd == -1)
		return errno;
	if (fstat(fd, &st)) {
		e = errno;
		close(fd);
		return e;
	}
	if (!S_ISREG(st.st_mode)) {
		close(fd);
		return EISDIR;
	}
	*buf = xmalloc(st.st_size + 1);
	*size = read_in_full(fd, *buf, st.st_size);
	e = errno;
	(*buf)[*size] = '\0';
	close(fd);
	return (*size == st.st_size ? 0 : e);
}

static int is_token_char(char c)
{
	return isalnum(c) || c == '_';
}

/* Replace name with getenv(name), return pointer to zero-terminating char
 */
static char *expand_macro(char *name, int maxlength)
{
	char *value;
	int len;

	len = 0;
	value = getenv(name);
	if (value) {
		len = strlen(value);
		if (len > maxlength)
			len = maxlength;
		strncpy(name, value, len);
	}
	return name + len;
}

#define EXPBUFSIZE (1024 * 8)

/* Replace all tokens prefixed by '$' in the specified text with the
 * value of the named environment variable.
 * NB: the return value is a static buffer, i.e. it must be strdup'd
 * by the caller.
 */
char *expand_macros(const char *txt)
{
	static char result[EXPBUFSIZE];
	char *p, *start;
	int len;

	p = result;
	start = NULL;
	while (p < result + EXPBUFSIZE - 1 && txt && *txt) {
		*p = *txt;
		if (start) {
			if (!is_token_char(*txt)) {
				if (p - start > 0) {
					*p = '\0';
					len = result + EXPBUFSIZE - start - 1;
					p = expand_macro(start, len) - 1;
				}
				start = NULL;
				txt--;
			}
			p++;
			txt++;
			continue;
		}
		if (*txt == '$') {
			start = p;
			txt++;
			continue;
		}
		p++;
		txt++;
	}
	*p = '\0';
	if (start && p - start > 0) {
		len = result + EXPBUFSIZE - start - 1;
		p = expand_macro(start, len);
		*p = '\0';
	}
	return result;
}

char *get_mimetype_for_filename(const char *filename)
{
	char *ext, *mimetype, *token, line[1024], *saveptr;
	FILE *file;
	struct string_list_item *mime;

	if (!filename)
		return NULL;

	ext = strrchr(filename, '.');
	if (!ext)
		return NULL;
	++ext;
	if (!ext[0])
		return NULL;
	mime = string_list_lookup(&ctx.cfg.mimetypes, ext);
	if (mime)
		return xstrdup(mime->util);

	if (!ctx.cfg.mimetype_file)
		return NULL;
	file = fopen(ctx.cfg.mimetype_file, "r");
	if (!file)
		return NULL;
	while (fgets(line, sizeof(line), file)) {
		if (!line[0] || line[0] == '#')
			continue;
		mimetype = strtok_r(line, " \t\r\n", &saveptr);
		while ((token = strtok_r(NULL, " \t\r\n", &saveptr))) {
			if (!strcasecmp(ext, token)) {
				fclose(file);
				return xstrdup(mimetype);
			}
		}
	}
	fclose(file);
	return NULL;
}