/*
 * caldav.h
 *
 * Copyright 2016 Michael Rasmussen <mir@datanom.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301, USA.
 */

#ifndef __CALDAV_H__
#define __CALDAV_H__

#include <glib.h>

G_BEGIN_DECLS

typedef enum {
	VUNKNOWN,
	VEVENT,
	VTODO,
	VFREEBUSY,
	VJOURNAL,
} Component;

typedef struct {
	guint status;    /* Status code from the request */
	GSList* headers; /* List of headers in the response */
	gpointer data;   /* Either gchar* or GSList* (Calendar) or GSList* (options). */
					 /* If adding or updating a component a successful */
					 /* request will return the ETag in data */
} CaldavResponse;

typedef enum {
	UNKNOWN,
	ADDOBJECTS,
	CALENDARINFO,
	CHANGEINFO,
	DELETEOBJECTS,
	DISCOVER,
	GETALLOBJECTS,
	GETOBJECTS,
	LOCKING,
	UNLOCKING,
	OPTIONSINFO,
	SIMPLEGET,
	UPDATEOBJECTS,
	FREEBUSY,
} Operation;

typedef struct {
	gchar* href;
	gchar* data;
} HrefData;

typedef guint (*Executor)(gpointer runtime);
typedef struct {
	FILE* file; /* Where to write output. If file is NULL only output will be in 'output' */
	gchar* username; /* Account to use */
	gchar* password; /* Password for the account */
	gchar* url; /* URL to caldav server */
	gboolean debug; /* Show debug */
	Operation* operation; /* Which operation to execute */
	CaldavResponse* output; /* Structure containing the response */
	Executor executor; /* Function which executes the request */
	gboolean default_executor; /* Using default executors or custom executors */
	gchar* etag; /* For If-Match */
	gchar* component; /* The data for UPDATEOBJECTS or ADDOBJECTS */
	GSList* hrefs; /* For GETOBJECTS: list of HrefData */
	GSList* options; /* List of supported options by this caldav server */
	GDateTime* start; /* Start time interval in ISO 8601 local time. */
					  /* 2017-01-13T13:13:13. For freebusy or get operations */
	GDateTime* finish; /* End time interval in ISO 8601 local time. */
					   /* 2017-01-13T13:13:13. For freebusy or get operations */
} Runtime;

typedef struct {
	gchar* url;
	gchar* displayname;
	gchar* ctag;
	GSList* components; /* list of Components */
} Calendar;

/**
 * Return a new Runtime structure all zeroed out.
 * @return NULL or a new Runtime
 */
Runtime* runtime_new();

/**
 * Free a previously created Runtime structure.
 * @param runtime
 */
void runtime_free(Runtime* runtime);

/**
 * Make a deep copy of a Runtime.
 * @param runtime
 * @return Runtime
 */
Runtime* runtime_copy(Runtime* runtime);

/**
 * Execute the Runtime
 * @param runtime
 * @return guint
 */
guint execute(Runtime* runtime);

/**
 * Make a deep copy of a Calendar structure
 * @param cal
 * @return a deep copy of the Calendar
 */
Calendar* calendar_copy(Calendar* cal);

/**
 * Free previously created Calendar.
 * @param cal
 */
void calendar_free(Calendar* cal);

/**
 * Dump Calendar to FILE.
 * @param file
 * @param cal
 */
void calendar_dump(FILE* file, Calendar* cal);

/**
 * Test whether Component is equal to Component
 * @param value
 * @param component
 * @return TRUE or FALSE
 */
gboolean is_component(const gchar* value, Component component);

/**
 * Convert Component to its string representation
 * @param component
 * @return String
 */
gchar* component_to_string(Component component);

/**
 * Convert a String representation of a component to Component.
 * @param value
 * @return Component
 */
Component string_to_component(const gchar* value);

/**
 * Get error as String from Runtime.
 * @param runtime
 * @return String
 */
gchar* status_str(Runtime* runtime);

/**
 * Deep copy of a GSList containing Strings to another GSList.
 * @param list
 * @return GSList
 */
GSList* slist_copy_gchar(GSList* list);

/**
 * Free a GSList of Strings.
 * @param list
 */
void slist_free_gchar(GSList* list);

/**
 * Create a new HrefData structure.
 * @param href
 * @param data
 * @return HrefData
 */
HrefData* href_data_new(const gchar* href, const gchar* data);

/**
 * Free a HrefData structure.
 * @param href_data
 */
void href_data_free(HrefData* href_data);

/**
 * Find HTTP header in GSList of HTTP headers.
 * @param list
 * @param header
 * @return String
 */
gchar* find_header(GSList* list, const gchar* header);

/**
 * Test whether caldav server supports option.
 * @param runtime
 * @param option
 * @return TRUE or FALSE
 */
gboolean has_option(Runtime* runtime, const gchar* option);

/**
 * Convert a string representation of an ISO 8601 date to GDateTime.
 * @param datetime
 * @return GDateTime
 */
GDateTime* get_date_time_from_string(const gchar* datetime);

G_END_DECLS

#endif