/**
 * Created by knut on 15-01-14.
 */
var moment = require('moment');
var Logger = require('../../logger');
var log = Logger.Log;


var dateFormat = '';
var title = '';
var sections = [];
var tasks = [];
var currentSection = '';

exports.clear = function(){
    sections = [];
    tasks = [];
    currentSection = '';
    title = '';
    taskCnt = 0;
    lastTask = undefined;
    lastTaskID = undefined;
    rawTasks = [];
};

exports.setDateFormat = function(txt){
    dateFormat = txt;
};

exports.getDateFormat = function(){
    return dateFormat;
};
exports.setTitle = function(txt){
    title = txt;
};

exports.getTitle = function(){
    return title;
};

exports.addSection = function(txt){
    currentSection = txt;
    sections.push(txt);
};


exports.getTasks=function(){
    var allItemsPricessed = compileTasks();
    var maxDepth = 10;
    var iterationCount = 0;
    while(!allItemsPricessed && (iterationCount < maxDepth)){
        allItemsPricessed = compileTasks();
        iterationCount++;
    }

    tasks = rawTasks;

    //var i;
    //for(i=10000;i<tasks.length;i++){
    //    tasks[i].startTime = moment(tasks[i].startTime).format(dateFormat);
    //    tasks[i].endTime = moment(tasks[i].endTime).format(dateFormat);
    //}

    return tasks;
};


var getStartDate = function(prevTime, dateFormat, str){
    //console.log('Deciding start date:'+JSON.stringify(str));
    //log.debug('Deciding start date:'+str);
    //log.debug('with dateformat:'+dateFormat);

    str = str.trim();

    // Test for after
    var re = /^after\s+([\d\w\-]+)/;
    var afterStatement = re.exec(str.trim());

    if(afterStatement!==null){
        var task = exports.findTaskById(afterStatement[1]);

        if(typeof task === 'undefined'){
            var dt = new Date();
            dt.setHours(0,0,0,0);
            return dt;
            //return undefined;
        }
        return task.endTime;
    }

    // Check for actual date set
    if(moment(str,dateFormat.trim(),true).isValid()){
        return moment(str,dateFormat.trim(),true).toDate();
    }else{
        log.debug('Invalid date:'+str);
        log.debug('With date format:'+dateFormat.trim());
        //log.debug('----');
    }

    // Default date - now
    return new Date();
};

var getEndDate = function(prevTime, dateFormat, str){
    str = str.trim();

    // Check for actual date
    if(moment(str,dateFormat.trim(),true).isValid()){

        return moment(str,dateFormat.trim()).toDate();
    }

    var d = moment(prevTime);
    // Check for length
    var re = /^([\d]+)([wdhms])/;
    var durationStatement = re.exec(str.trim());

    if(durationStatement!== null){
        switch(durationStatement[2]){
            case 's':
                d.add(durationStatement[1], 'seconds');
                break;
            case 'm':
                d.add(durationStatement[1], 'minutes');
                break;
            case 'h':
                d.add(durationStatement[1], 'hours');
                break;
            case 'd':
                d.add(durationStatement[1], 'days');
                break;
            case 'w':
                d.add(durationStatement[1], 'weeks');
                break;
        }
        return d.toDate();
    }
    // Default date - now
    return d.toDate();
};

var taskCnt = 0;
var parseId = function(idStr){
    if(typeof idStr === 'undefined'){
        taskCnt = taskCnt + 1;
        return 'task'+taskCnt;
    }
    return idStr;
};
// id, startDate, endDate
// id, startDate, length
// id, after x, endDate
// id, after x, length
// startDate, endDate
// startDate, length
// after x, endDate
// after x, length
// endDate
// length

var compileData = function(prevTask, dataStr){
    var ds;

    if(dataStr.substr(0,1) === ':'){
        ds = dataStr.substr(1,dataStr.length);
    }
    else{
        ds=dataStr;
    }

    var data = ds.split(',');


    var task = {};
    var df = exports.getDateFormat();


    // Get tags like active, done cand crit
    var matchFound = true;
    while(matchFound){
        matchFound = false;
        if(data[0].match(/^\s*active\s*$/)){
            task.active = true;
            data.shift(1);
            matchFound = true;

        }
        if(data[0].match(/^\s*done\s*$/)){
            task.done = true;
            data.shift(1);
            matchFound = true;
        }
        if(data[0].match(/^\s*crit\s*$/)){
            task.crit = true;
            data.shift(1);
            matchFound = true;
        }
    }
    var i;
    for(i=0;i<data.length;i++){
        data[i] = data[i].trim();
    }


    switch(data.length){
        case 1:
            task.id = parseId();
            task.startTime = prevTask.endTime;
            task.endTime   = getEndDate(task.startTime, df, data[0]);
            break;
        case 2:
            task.id = parseId();
            task.startTime = getStartDate(undefined, df, data[0]);
            task.endTime   = getEndDate(task.startTime, df, data[1]);
            break;
        case 3:
            task.id = parseId(data[0]);
            task.startTime = getStartDate(undefined, df, data[1]);
            task.endTime   = getEndDate(task.startTime, df, data[2]);
            break;
        default:

    }

    return task;
};

var parseData = function(prevTaskId, dataStr){
    var ds;

    if(dataStr.substr(0,1) === ':'){
        ds = dataStr.substr(1,dataStr.length);
    }
    else{
        ds=dataStr;
    }

    var data = ds.split(',');


    var task = {};

    // Get tags like active, done cand crit
    var matchFound = true;
    while(matchFound){
        matchFound = false;
        if(data[0].match(/^\s*active\s*$/)){
            task.active = true;
            data.shift(1);
            matchFound = true;

        }
        if(data[0].match(/^\s*done\s*$/)){
            task.done = true;
            data.shift(1);
            matchFound = true;
        }
        if(data[0].match(/^\s*crit\s*$/)){
            task.crit = true;
            data.shift(1);
            matchFound = true;
        }
    }
    var i;
    for(i=0;i<data.length;i++){
        data[i] = data[i].trim();
    }


    switch(data.length){
        case 1:
            task.id = parseId();
            task.startTime = {type: 'prevTaskEnd', id:prevTaskId};
            task.endTime   = {data: data[0]};
            break;
        case 2:
            task.id = parseId();
            task.startTime = {type:'getStartDate',startData:data[0]};
            task.endTime   = {data: data[1]};
            break;
        case 3:
            task.id = parseId(data[0]);
            task.startTime = {type:'getStartDate',startData: data[1]};
            task.endTime   = {data: data[2]};
            break;
        default:

    }

    return task;
};



var lastTask;
var lastTaskID;
var rawTasks = [];
var taskDb = {};
exports.addTask = function(descr,data){
    var rawTask = {
        section:currentSection,
        type:currentSection,
        processed:false,
        raw:{data:data},
        task:descr
    };
    var taskInfo = parseData(lastTaskID, data);
    rawTask.raw.startTime  = taskInfo.startTime;
    rawTask.raw.endTime    = taskInfo.endTime;
    rawTask.id         = taskInfo.id;
    rawTask.prevTaskId = lastTaskID;
    rawTask.active     = taskInfo.active;
    rawTask.done       = taskInfo.done;
    rawTask.crit       = taskInfo.crit;

    var pos = rawTasks.push(rawTask);

    lastTaskID = rawTask.id;
    // Store cross ref
    taskDb[rawTask.id]= pos-1;

};


exports.findTaskById = function(id) {
    //var i;
    //for(i=0;i<tasks.length;i++){
    //    if(tasks[i].id === id){
    //        return tasks[i];
    //    }
    //}

    var pos = taskDb[id];
    return rawTasks[pos];
};

exports.addTaskOrg = function(descr,data){

    var newTask = {
        section:currentSection,
        type:currentSection,
        description:descr,
        task:descr
    };
    var taskInfo = compileData(lastTask, data);
    newTask.startTime = taskInfo.startTime;
    newTask.endTime   = taskInfo.endTime;
    newTask.id        = taskInfo.id;
    newTask.active    = taskInfo.active;
    newTask.done      = taskInfo.done;
    newTask.crit      = taskInfo.crit;
    lastTask = newTask;
    tasks.push(newTask);
};

var compileTasks=function(){
    var df = exports.getDateFormat();

    var compileTask = function(pos){
        var task = rawTasks[pos];
        var startTime = '';
        switch(rawTasks[pos].raw.startTime.type){
            case 'prevTaskEnd':
                var prevTask = exports.findTaskById(task.prevTaskId);
                task.startTime = prevTask.endTime;
                break;
            case 'getStartDate':
                startTime = getStartDate(undefined, df, rawTasks[pos].raw.startTime.startData);
                if(startTime){
                    rawTasks[pos].startTime = startTime;
                }
                break;
        }

        if(rawTasks[pos].startTime){
            rawTasks[pos].endTime = getEndDate(rawTasks[pos].startTime, df, rawTasks[pos].raw.endTime.data);
            if(rawTasks[pos].endTime){
                rawTasks[pos].processed = true;
            }
        }

        return rawTasks[pos].processed;

    };

    var i;
    var allProcessed = true;
    for(i=0;i<rawTasks.length;i++){
        compileTask(i);

        allProcessed = allProcessed && rawTasks[i].processed;
    }
    return allProcessed;
};

exports.parseError = function(err,hash){
    global.mermaidAPI.parseError(err,hash);
};