// Our frame object
function PageFrame() {
	'use strict';

	/* Frame type settings */
	this.settings = {};

	/* Frame Version */
	this.version = 1;

	/* Frame Number [0-9] */
	this.frame = null;

	/* Frame Index [a-z] */
	this.index = null;

	/* The Service Provider owning the frame. */
	this.owner = 0;

	/* The cost to view the frame @todo to implement */
	this.cost = 0;

	/* The frame content, base64 encoded */
	this.content = '';

	// Frame's owned by the system where:
	// isPublic is FALSE	- the user must be logged in to view it
	// isPublic is TRUE		- can be viewed by non-logged in users

	// Frame's owned by Service Providers where:
	// isPublic is FALSE	- can only be viewed if a user is
	//          			a member of the Service Providers CUG
	// isPublic is TRUE		- can be viewed by users (if logged in)

	this.isPublic = false;				// Is this frame accessible to non CUG users
	// If FALSE user must be a member of the CUG to view the frame
	// All users, including unauthenticated, are members of 'system' (owner = 0)
	this.isAccessible = false;			// Is this frame available to be accessed
	// If FALSE, only the SP can view/edit the frame

	this.type = FRAME_TYPE_INFO;		// The frame type - see FRAME_TYPES above
	this.key = [null,null,null,null,null,null,null,null,null,null];	// Key actions [0-9]

	/**
	 * Determine if this frame is accessible to the current user
	 */
	Object.defineProperty(this,'accessible',{
		get: function() {
			log(LOG_DEBUG,'- Checking if user can access frame: '+this.page);
			log(LOG_DEBUG,'  - User: '+JSON.stringify(user.number));
			log(LOG_DEBUG,'  - Frame Owner: '+JSON.stringify(this.owner)+', System Frame: '+(this.pageowner === SYSTEM_OWNER));

			// user.number 0 is unidentified user.
			if (user.number) {
				return (
					(this.isAccessible && this.pageowner === SYSTEM_OWNER && ! this.isPublic) ||
					(this.isAccessible && this.isPublic) ||
					(this.isAccessible && ! this.isPublic && this.isMember) ||
					(pageEditor(this.frame))
				);

			} else {
				return (this.isAccessible && this.pageowner === SYSTEM_OWNER && this.isPublic);
			}
		}
	});

	/**
	 * Return the frames fields
	 */
	Object.defineProperty(this,'fields', {
		get: function() {
			return this.frame_fields;
		}
	});

	/**
	 * Check if the user is already a member of the CUG
	 */
	Object.defineProperty(this,'isMember',{
		get: function() {
			log(LOG_DEBUG,'- Checking if user is a member of frame: '+this.page);

			if (user.number) {
				return (
					(this.pageowner === SYSTEM_OWNER)
				);

			} else {
				return false;
			}
		}
	})

	/**
	 * Return the page number
	 */
	Object.defineProperty(this,'page', {
		get: function() {
			if (this.frame === null || this.index === null) return null;
			return this.frame.toString()+this.index;
		}
	});

	Object.defineProperty(this,'pageowner', {
		get: function() {
			return pageOwner(this.frame).prefix;
		}
	})

	Object.defineProperty(this,'pageownerlogo', {
		get: function() {
			return base64_decode(pageOwner(this.frame).logoans);
		}
	})
}

/**
 * Enable pulling out submitted value by its name
 *
 * @param key
 * @returns {null|string|*}
 */
PageFrame.prototype.fieldValue = function(key) {
	for each (var k in this.frame_fields) {
		log(LOG_DEBUG,'  - k:'+JSON.stringify(k));

		if (k.fname === key) {
			return k.fvalue;
		}
	}

	return null;
}

/**
 * Return the message for a index
 *
 * @param index
 * @returns {string|*}
 */
PageFrame.prototype.getMessage = function(index) {
	eval('var msg = this.settings.'+index);
	return msg;
}

/**
 * Load a frame
 *
 * @param filename
 * @returns {null}
 */
PageFrame.prototype.load = function(filename) {
	log(LOG_DEBUG,'Loading FRAME from: '+filename+'.'+this.settings.ext);
	this.sendBaseline('LOADING');

	f = new File(system.mods_dir+'ansitex/text/'+filename+'.'+this.settings.ext);
	if (! f.exists || ! f.open('r')) {
		return null;
	}

	try {
		var load = JSON.parse(f.read());

		for (property in SAVED_FRAME_ATTRS) {
			this[SAVED_FRAME_ATTRS[property]] = load[SAVED_FRAME_ATTRS[property]];
		}

		// If the page doesnt match the filename, throw an error
		if (this.page !== filename)
			throw 'Frame doesnt match filename';

	} catch (error) {
		log(LOG_ERROR,'Frame error: '+error);

		// Load our system error frame.
		this.load(pageStr(FRAME_SYSTEM_ERROR));
		return null;
	}

	log(LOG_DEBUG,'Loaded frame: ['+this.frame+']['+this.index+'] ('+this.page+')');
};

/**
 * Load a message frame
 *
 * @param page
 */
PageFrame.prototype.loadMessage = function(page) {
	this.frame = ''+page;
	this.index = 'a';
	this.owner = 1;
	this.isPublic = true;
	this.isAccessible = true;
	// @todo Keys should map to next/previous/send, etc as indicated in the template frame.
	this.key = [this.frame.substr(0,7)+'1',null,null,null,null,null,null,null,null,null];
	this.type = FRAME_TYPE_MESSAGE;

	// Load our message
	var ma = new MsgAreas()
	var area = ma.getArea(this.frame);
	var msg = ma.getMessage(this.frame);
	var msg_header;

	if (! msg)
		return undefined;

	// @todo Search 1zzzzEE..., 1zzzz...
	var to = viewdata ? new FrameViewdata() : new FrameAnsi();
	to.load(MAIL_TEMPLATE_FRAME);
	// @todo Check that this is a frame of type "m" and report error if not
	// @todo Take the cost from the template
	this.cost = 5;

	if (! to) {
		log(LOG_ERROR,'Echomail template missing :['+MAIL_TEMPLATE_FRAME+'] ?');
		msg_header = 'TO: '+msg.to.substr(0,72)+"\n\r";
		msg_header += 'FROM: '+msg.from.substr(0,72)+"\n\r";
		msg_header += 'DATE: '+msg.date.substr(0,72)+"\n\r";
		msg_header += 'SUBJECT: '+msg.subject.substr(0,72)+"\n\r";

	} else {
		// @todo change this to use atcode()
		msg_header = base64_decode(to.content).replace(/@(.*)@/g,
			function (str, code, offset, s) {
				var length = code.split(':')[1];
				switch(code.split(':')[0]) {
					case 'DATE': return msg.date.substr(0,length);
					case 'TO': return msg.to.substr(0,length);
					case 'FROM': return msg.from.substr(0,length);
					case 'SUBJECT': return msg.subject.substr(0,length);
				}
			}
		);
	}

	//log(LOG_DEBUG,'Loaded message: '+msg_header+msg.content);
	this.content = base64_encode(msg_header+msg.content);

	// Update the user's pointers
	var stats = ma.getUserStats(this.frame);

	// if this message is to the user, and the msg number > scan_ptr and it is the next message on the user's new mail list
	var newmsgs = area.newMsgsToMe();
	log(LOG_DEBUG,'User has: '+newmsgs.length+' msgs to read to ME');
	if (newmsgs.length) {
		var next = newmsgs[0];

		//log(LOG_DEBUG,'- NEXT is: '+next.tags+', this is: '+msg.tags);
		if (next.tags === msg.tags) {
			log(LOG_DEBUG,'- Updating scan_ptr to: '+next.number);
			stats.scan_ptr = next.number;
		}
	}

	// if this message is the next message, update last_read
	var newmsgs = area.newMsgs();
	log(LOG_DEBUG,'User has: '+newmsgs.length+' msgs to read');
	if (newmsgs.length) {
		var next = newmsgs[0];

		//log(LOG_DEBUG,'- NEXT is: '+next.tags+', this is: '+msg.tags);
		if (next.tags === msg.tags) {
			log(LOG_DEBUG,'- Updating last_read to: '+next.number);
			stats.last_read = next.number;
		}
	}

	log(LOG_DEBUG,'Built frame: ['+this.frame+']['+this.index+'] ('+this.page+')');
}

/**
 * Parse the page text, and return the frame as 2 arrays:
 * + First array is all the characters and the position on the frame
 * + Second array is the array of the control codes that changes the color of the character
 *
 * The purpose of this function is to convert any special char sequences there are interpreted directly by Ansitex
 * Currently they are:
 * + ESC _ <value>[;value] ESC \
 *
 * Additionally, for response frames, if the cursor is moved to a field, its to determine what attributes (eg: color)
 * should apply for that field.
 *
 * @param text
 * @param context
 */
PageFrame.prototype.parse = function(text,context) {
	log(LOG_DEBUG,'Parsing Frame ...');

	if (this.type === FRAME_TYPE_MESSAGE) {
		log(LOG_DEBUG,'- Not parsing message frame');
		return text;
	}

	/** Column
	 * @type {number}
	 */
	var c = 1;
	/** Row - row 1 is the header
	 * @type {number}
	 */
	var r = 2;
	/**
	 * The output to send to the screen
	 * @type {string}
	 */
	var output = '';
	/**
	 * Fields within the frame
	 * @type {{
	 *   ftype: fieldtype,
	 *   flength: fieldlen,
	 *   fchar: fieldchar,
	 *   fname: field,
	 *   r: r,
	 *   c: c,
	 *   attribute: {i:i,f:f,b:b},
	 *   fvalue: '',
	 *   }}
	 */
	this.frame_fields = [];

	// If there is no text return
	if (! text)
		return output;

	// Default Attributes
	// @note - this has no affect for viewdata frames
	/* Foreground */
	var f = 39;
	/* Background */
	var b = 49;
	/* Intensity */
	var i = 0;

	for(var p=0;p<text.length;p++) {
		// Look for a special character until the end of the frame width
		cte = (r*this.settings.FRAME_WIDTH - ((r-1)*this.settings.FRAME_WIDTH+c));
		match = text.substr(p,cte).match(/[\r\n\x1b]/);
		//log(LOG_DEBUG,'SPECIAL CHAR ['+r+'x'+c+'] ['+p+'-'+cte+'] for: '+match);

		if (match === null || match.index) {
			advance = match ? match.index : cte;
			//log(LOG_DEBUG,'INCLUDE: '+text.substr(p,advance));

			output += text.substr(p,advance);
			p += advance;
			c += advance;
			advance = 0;
		}

		// If the frame is not big enough, fill it with spaces.
		byte = text.charAt(p);
		advance = 0;

		switch (byte) {
			// Carriage Return
			case "\r":
				// log(LOG_DEBUG,'CR');
				c=1;
				break;

			// New line
			case "\n":
				// log(LOG_DEBUG,'LF');
				r++;
				break;

			// ESC
			case KEY_ESC:
				advance = 1;
				// Is the next byte something we know about
				nextbyte = text.charAt(p+advance);
				//log(LOG_DEBUG,'ESC ['+r+'x'+c+'] NEXT: '+nextbyte);

				switch (nextbyte) {
					// CSI
					case '[':
						advance++;
						chars = '';

						// Find our end CSI param in the next 50 chars
						matches = text.substr(p+advance,50).match(/([0-9]+[;]?)+([a-zA-Z])/);
						//log(LOG_DEBUG,'CSI ['+r+'x'+c+'] ADVANCE: '+advance+', MATCHES: '+matches+', STRING: '+text.substr(p+advance,50));

						if (! matches) {
							chars += nextbyte;

							break;
						}

						advance += matches[0].length-1;
						chars += nextbyte+matches[0];
						//log(LOG_DEBUG,'CSI ['+r+'x'+c+'] ADVANCE: '+advance+', CHARS: '+chars+', CHARSLEN: '+chars.length);

						switch (matches[2]) {
							// Color CSIs
							case 'm':
								//log(LOG_DEBUG,'CSI m ['+r+'x'+c+'] MATCHES: '+matches[0]+', LENGTH : '+matches[0].length);

								csi = matches[0].substr(0,matches[0].length-1).split(';');
								var num = null;
								for (num in csi) {
									//log(LOG_DEBUG,'CSI m ['+r+'x'+c+'] NUM: '+num+', CSI: '+csi[num]);
									// Intensity
									if (csi[num] >= 0 && csi[num] <= 8) {
										i = csi[num];
										f = 39;
										b = 49;

										// Forground Color
									} else if (csi[num] >= 30 && csi[num] <= 39) {
										f = csi[num];

										// Background Color
									} else if (csi[num] >= 40 && csi[num] <= 49) {
										b = num;
									}
								}
								break;

							// Advance characters
							case 'C':
								//log(LOG_DEBUG,'CSI C ['+r+'x'+c+'] CHARS: '+matches[1]);
								c += parseInt(matches[1]); // Advance our position
								break;

							default:
								log(LOG_DEBUG,'? CSI: '+matches[2]);
						}

						break;

					case ' ':
						log(LOG_DEBUG,'LOOSE ESC? ['+r+'x'+c+'] '+advance);

						break;

					// X - dynamic fields, terminated with ESC
					// Dynamic fields are defined with ESC X FIELD;LENGTH;PAD ESC \
					// @note FIELD & LENGTH are required
					// @note Dynamic field is can only be DYNAMIC_FIELD_SIZE_MAX chars in size
					case 'X':
						//log(LOG_DEBUG,'DF ['+r+'x'+c+'] '+advance);
						advance++;

						// Find our end ST param in the next DYNAMIC_FIELD_SIZE_MAX chars
						matches = text.substr(p+advance,DYNAMIC_FIELD_SIZE_MAX).match(/(([a-zA-Z._:^;]+[0-9]?;-?[0-9^;]+)([;]?[^;]+)?)\x1b\\/);
						//log(LOG_DEBUG,'- DF ['+r+'x'+c+'] ADVANCE: '+advance+', MATCHES: '+JSON.stringify(matches)+', LENGTH: '+(matches ? matches[0].length : 0)+', STRING: '+text.substr(p+advance,50));

						if (! matches) {
							chars += nextbyte;

							break;
						}

						advance += matches[0].length-1;

						var df = matches[0].substr(0,matches[0].length-2).split(';');
						//log(LOG_DEBUG,'- DF ['+r+'x'+c+'] ADVANCE: '+advance+', DF: '+df);

						log(LOG_DEBUG,'- DF found at ['+r+'x'+(c-1)+'], Field: '+df[0]+', Length: '+df[1]+', Attrs: '+JSON.stringify({i:i,f:f,b:b}));
						chars = atcode(df[0],df[1],df[2],context);
						byte = '';

						break;

					// _ - has our fields that take input
					case '_':
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] '+advance);
						advance++;

						// Find our end ST param in the next 50 chars
						matches = text.substr(p+advance,50).match(/(([A-Z]+;[0-9a-z]+)([;]?.+)?)\x1b\\/);
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] ADVANCE: '+advance+', MATCHES: '+matches+', LENGTH: '+matches[0].length+', STRING: '+text.substr(p+advance,50));

						if (! matches) {
							chars += nextbyte;

							break;
						}

						advance += matches[0].length-1;

						// The last 2 chars of matches[0] are the ESC \
						var sos = matches[0].substr(0,matches[0].length-2).split(';');
						//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] ADVANCE: '+advance+', SOS: '+sos);

						var num = null;
						var field = null;
						var fieldlen = null;
						for (num in sos) {
							//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] NUM: '+num+', SOS: '+sos[num]);

							switch (num) {
								// First value is the field name
								case '0':
									field = sos[num];
									break;

								// Second value is the length/type of the field
								case '1':
									x = sos[num].match(/([0-9]+)([a-z])/);
									if (! x) {
										log(LOG_ERROR,'SOS FAILED PARSING FIELD LENGTH/TYPE. ['+r+'x'+c+'] '+sos[num]);
										break;
									}

									//log(LOG_DEBUG,'SOS ['+r+'x'+c+'] NUM CHARS: '+x[1]+', TYPE: '+x[2]);
									fieldlen = x[1];
									fieldtype = x[2];
									break;

								// Third field is the char to to use
								case '2':
									fieldchar = sos[num];
									break;

								default:
									log(LOG_ERROR,'IGNORING ADDITIONAL SOS FIELDS. ['+r+'x'+c+'] '+sos[num]);
							}
						}

						if (fieldlen) {
							chars = fieldchar.repeat(fieldlen);
						}

						byte = '';

						this.frame_fields.push({
							ftype: fieldtype,
							flength: fieldlen,
							fchar: fieldchar,
							fname: field,
							r: r,
							c: c,
							attribute: {i:i,f:f,b:b},
							fvalue: '',
						});

						log(LOG_DEBUG,'SOS Field found at ['+r+'x'+(c-1)+'], Type: '+fieldtype+', Length: '+fieldlen+', Attrs: '+JSON.stringify({i:i,f:f,b:b}));

						break;

					default:
						log(LOG_DEBUG,'DEFAULT ['+r+'x'+c+'] '+advance);
				}

				break;

			default:
				c++;
		}

		output += byte;

		if (advance) {
			//log(LOG_DEBUG,'ADVANCE P ['+r+'x'+c+'] '+advance+', NEXT CHAR: '+text.charAt(p+advance)+' ('+text.charCodeAt(p+advance)+')');
			output += chars;
			p += advance;
		}

		if (c>this.settings.FRAME_WIDTH) {
			c = 1;
			r++;
		}

		/*
		// @todo - If we are longer than FRAME_LENGTH, move the output into the next frame.
		if (r>this.settings.FRAME_LENGTH) {
			break;
		}
		*/
	}

	return output;
};