#!/usr/bin/env node
// vim: set filetype=javascript:

var path = require('path');
var fs = require('fs');

var program = require('commander');
var moment = require('moment');
var colors = require('colors');

var T = require('../t');
// In case want to debug
// var options = {
//     pomoTimer: 1,
//     shortBreakTimer: 1,
//     longerBreakTimer: 1.5
// };
var config = require('../lib/config');
var addUser = require('../lib/adduser');
var Client = require('../lib/client');
var pomodoro = require('../lib/pomodoro')();

// Track tasks daily, saved as a plain text file named by today's date
// eg. 2013-10-10.t
var today = moment().format('YYYY-MM-DD');

function start(t) {
  var lines = [
    '\n',
    'You are working on ' + t.task.text.bold.cyan + '\t',
    '\n',
    '\nPress Ctrl+C to stop(break or interrupt) task'
  ];
  var timerY = 1;
  var timerX = lines[timerY].length;
  var lastY = lines.length - 1;
  var lastX = lines[lastY].length;
  // TODO: More smart to determine longer or short break
  var pomos = t.getAllPomodori().length;
  var mode = (pomos && pomos % pomodoro.pomodori === 0) ? 'longer' : 'short';
  var charm = require('charm')(process);

  // Write lines
  lines.forEach(charm.write, charm);

  // Init timer's output position
  charm.move(timerX - lastX, timerY - lastY);

  pomodoro.on('tick', function(timer) {
    charm.left(timer.length);
    charm.write(timer.green);
  });

  pomodoro.start(mode);

  charm.removeAllListeners('^C');
  // Once accept key to break or interrupt
  charm.once('^C', function() {
    var start = t.task.start.split(':');
    var startTime = moment({
      hours: +start[0],
      minutes: +start[1]
    });
    // Duration is minutes
    var duration = moment().diff(startTime, 'minutes');
    if (duration >= pomodoro.pomoTimer) {
      // console.log('Take a break: ' + mode);
      // Take a break
      t.task.metas.pomodoro = 1;
      // Remove interruption mark on an existing task
      delete t.task.metas.interruption;
      // Stop here to record actual end time
      t.stop();
      pomodoro.break(mode);
    }
    else {
      // console.log('Take an interruption');
      t.task.metas.interruption = 1;
      // Remove pomodoro mark on an existing task
      delete t.task.metas.pomodoro;
      pomodoro.stopTimer();
      // Log the interruption
      charm.move(-timerX, lastY - timerY + 1);
      console.log('\nChoose a interruption reason or enter others:');
      console.log('\n(Press Ctrl+C one more time to exit)');

      var conf = config.load();
      conf.interruptions = conf.interruptions ||
          [
            'Colleague Interrupted',
            'Boss Interrupted',
            'Phone Call'
          ];
      var inputs = [];
      var interruptions = conf.interruptions;
      interruptions.forEach(function(value, i) {
        console.log((i + '. ' + value).red);
      });
      process.stdin.on('data', function(chunk) {
        var s = chunk.toString('utf8');
        if (s.charCodeAt(0) === 127 && inputs.length > 0) {
          // Match BACKSPACE
          inputs.pop();
          charm.erase('start');
          charm.move(-inputs.length - 1, 0);
          charm.write(inputs.join(''));
        }
        else if (s.match(/\r\n|[\n\r\u0085\u2028\u2029]/)) {
          // Match ENTER
          // Remove first '\u003'
          inputs.shift();
          // console.log(inputs);
          var line = inputs.join('').trim();
          if (line.match(/^\d+$/)) {
            t.task.metas.interruption = interruptions[+line] || 1;
          }
          else {
            t.task.metas.interruption = line || 1;
            if (line && interruptions.indexOf(line) === -1) {
              interruptions.push(line);
              config.save(conf);
            }
          }
          console.log('\n');
          console.log('Interrupted +1'.red);
          charm.emit('^C');
        }
        else {
          inputs.push(s);
        }
      });
    }

    // Exit on next Ctrl+C
    charm.once('^C', function() {
      if (t.task.metas.interruption) {
        // Interrupted task should be saved once exit to record Interrupt
        // reason.
        t.stop();
      }
      process.exit();
    });
  });
}

// date format: YYYY-MM-DD
function iniT(date, cb) {
  var conf = config.load(function(err) {
    console.log('\nPlease set task saved directory first.');
    program.outputHelp();
    process.exit(1);
  });

  var t = new T(path.join(conf.dir, (date || today) + '.t'));
  if (cb) {
    t.stream.on('error', function(e) { cb(e, t); });
    t.parser.on('end', function(e) { cb(e, t); });
  }
  return t;
}

program
  .command('set [dir]')
  .description('get/set the task saved directory')
  .action(function(d) {
    var conf = config.load();
    if (d) {
      conf.dir = path.resolve(d);
      config.save(conf);
      console.log('Set the saved directory to ' + conf.dir + ' success!');
    }
    else {
      // Show the saved directory without specified
      console.log(conf.dir || 'You have not set task saved directory yet!');
    }
  });

program
  .command('adduser')
  .description('register/auth user')
  .action(function() {
    addUser(function(err) {
      console.log(err ? err : 'Done');
    });
  });

program
  .command('add <task>')
  .description('add a new task(todo)')
  .action(function(text) {
    iniT(today, function(e, t) {
      t.todo(text);
    });
  });

program
  .command('start <id|task>')
  .description('start a task by id, or start a new task')
  .action(function(arg) {
    iniT(today, function(e, t) {
      if (/^\d+$/.test(arg)) {
        // Start task by id
        var id = parseInt(arg, 10);
          try {
            t.start(id);
            start(t);
          }
          catch(err) {
            console.log('Task id ' + arg.red + ' does not exist!');
            process.exit(1);
          }
      }
      else {
        // Add new task then start
        t.start(arg);
        start(t);
      }
    });
  });

program
  .command('list [period]')
  .description('list tasks, optional specified by days or week.\n' +
      '\teg.\n' +
      '\tlist\tlist today\'s tasks\n' +
      '\tlist 3\tlist last 3 day\'s tasks'
    )
  .action(function(period) {
    if (period) {
      var days = parseInt(period, 10);
      var date;

      var _next = function(e, t) {
        console.log('\n' + date.bold.magenta + '\n');
        var list = t.getSortedList();
        if (list.length === 0) {
          console.log('You have no task today!'.cyan);
        }
        list.forEach(function(item, i) {
          // Exclude todo items
          if (item.start && item.end) {
            var duration = item.start + ' - ' + item.end;
            console.log(duration.green + '\t' + item.text.cyan);
          }
        });
        if (--days >= 0) {
          summary(days);
        }
      };

      var summary = function(days) {
        date = moment().subtract('d', days).format('YYYY-MM-DD');
        iniT(date, _next);
      };

      if (days > 0 && days < 30) {
        summary(--days);
      }
    }
    else {
      var t = iniT();
      t.parser.on('end', function() {
        var list = t.getUniqList();
        if (list.length === 0) {
          console.log('You have no task tracked today!');
          process.exit(1);
        }
        // List with ids
        list.forEach(function(item, i) {
          console.log(i.toString().green+ '\t' + item.text.cyan);
        });
      });
    }
  });

program
  .command('upload [period]')
  .description('upload tasks, optional specified by days or week or filename.\n' +
      '\teg.\n' +
      '\tupload\tupload today\'s tasks\n' +
      '\tupload 3\tupload last 3 day\'s tasks'
    )
  .action(function(period) {
    var client = new Client();
    var days, i, filepath, conf;

    function done(err) {
      if (err) {
        console.log(err);
        process.exit();
      }
      else {
        console.log('Upload Done!');
      }
    }

    conf = config.load(done);

    if (period) {
      filepath = path.resolve(period);
      days = parseInt(period, 10);

      if (fs.existsSync(filepath)) {
        client.upload([filepath], done);
      }
      else if (days) {
        var files = [], date;
        for(i = days; i--;) {
          date = moment().subtract('d', i).format('YYYY-MM-DD');
          files.push(path.join(conf.dir, date + '.t'));
        }
        // TODO: limit files' count
        client.upload(files, done);
      }
      else {
        console.log('No file to upload');
        // program.outputHelp();
      }
    }
    else {
      // default today's task
      client.upload([path.join(conf.dir, today + '.t')], done);
    }
  });

program.parse(process.argv);

if (process.argv.length == 2) {
  program.outputHelp();
}