/*jshint supernew:true */
/*
Copyright (c) 2011 Richard Rodger

BSD License
-----------

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:

1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.

2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.

3. The names of the copyright holders and contributors may not be used
to endorse or promote products derived from this software without
specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE
*/



(function(){

  function Cache(maxitems) {
    var self = this



    var hits   = 0
    var misses = 0
    var sets   = 0
    var drops  = 0
    var dels   = 0

    var map  = {}
    var keys = []

    self.m = map
    self.k = keys


    self.clear = function() {
      map  = {}
      keys = []
    }

    self.ratio = function(){
      return hits / (hits+misses)
    }

    self.stats = function(){
      return {
        ratio:    self.ratio(),
        hits:     hits,
        misses:   misses,
        sets:     sets,
        drops:    drops,     
        dels:     dels,
        sizekeys: keys.length,
        mapkeys:  _.keys(map).length,
        maxitems: maxitems
      }
    }

    self.get = function( key ) {
      if( !util.enablecache ) return undefined;

      var val = map[key]

      if( undefined === val ) { misses++; return null; }
      else { hits++; return val; }
    }

    self.set = function( key, val ) {
      if( !util.enablecache ) return undefined;

      if( null !== key && 
          undefined !== key && 
          null !== val && 
          undefined !== val 
        ) 
      {
        var prev = map[key]
        map[key] = val
        sets++

        if( null === prev ) {
          keys.push(key)
        }

        if( maxitems < keys.length ) {
          var kill = keys.shift();
          delete map[kill];
          drops++
        }
      }
      return val
    }

    self.del = function( key ) {
      delete map[key]
      var i = keys.indexOf(key)
      if( -1 != i ) {
        keys.splice(i,1)
        dels++
      }
    }
  }



  function LSCache(maxitems,prefix,version) {
    var self = this

    version = version || 1

    var hits   = 0
    var misses = 0
    var sets   = 0
    var drops  = 0
    var dels   = 0
    
    var active = true
    var keys = []

    self.keys = function() {
      var obj = store.get('keys_'+prefix) || []
      if( obj.list ) {
        return obj.list
      }
      else {
        return obj
      }
    }

    self.clear = function(cb) {
      active = false
      self.m && self.m.clear()
      keys = self.keys()

      function kill(i) {
        if( i < keys.length ) {
          var key = keys[i];
          var fullkey = prefix+key;
          store.remove(fullkey);
          //setTimeout(function(){kill(i+1)},1);
          kill(i+1)
        }
        else {
          store.set('keys_'+prefix,[]);
          active = true;
          cb && cb();
        }
      }
      kill(0)
    }

    var currentversion = store.get('version_'+prefix)

    if( currentversion && currentversion != version ) {
      self.clear(function(){
        store.set('version_'+prefix, currentversion = version)
      })
    }
    else {
      if( !currentversion ) {
        store.set('version_'+prefix, version)
      }
      keys = self.keys()
    }

    var mem = new Cache( 10 < maxitems ? Math.floor(maxitems/10) : 1 )

    self.m = mem

    self.ratio = function(){
      return hits / (hits+misses)
    }

    self.stats = function(){
      return {
        ratio:    self.ratio(),
        hits:     hits,
        misses:   misses,
        sets:     sets,
        drops:    drops,     
        dels:     dels,
        sizekeys: keys.length,
        maxitems: maxitems,
        mem: mem.stats()
      }
    }


    self.get = function( key ) {
      if( !util.enablecache ) return undefined;

      try {
        var val = mem.get(key)
        if( null === val && active ) {
          var fullkey = prefix+key
          val = store.get(fullkey)
          if( undefined !== val ) {
            mem.set(key,val)
          }
        }

        if( undefined === val ) { misses++; return null; }
        else { hits++; return val; }
      }
      catch(e){
        log(e)
        return undefined
      }
    }

    self.set = function( key, val ) {
      if( !util.enablecache ) return undefined;

      try {
        if( null !== key &&
            undefined !== key &&
            null !== val &&
            undefined !== val 
          ) 
        {
          mem.set(key,val)

          if( active ) {
            var fullkey = prefix+key
            store.set(fullkey,val)

            keys.push(key)
            keys = _.uniq(keys)
            store.set('keys_'+prefix,keys)

            sets++

            if( maxitems < keys.length ) {
              var kill = Math.floor(Math.random()*keys.length);
              store.remove(prefix+keys[kill]);
              keys.splice(kill,1);
              store.set('keys_'+prefix,keys)
              drops++;
            }
          }
        }
        return val
      }
      catch(e){
        log(e)
        return undefined
      }
    }

    self.del = function( key ) {
      try {
        mem.del(key)
        var i = keys.indexOf(key)
        if( -1 != i ) {
          keys.splice(i,1);
          var fullkey = prefix+key;
          store.remove(fullkey);
          store.set('keys_'+prefix,keys)
          dels++;
        }
      }
      catch(e){
        log(e)
      }
    }
  }


  window.util = {

    firebuglite: function( ) {
      var se = document.createElement('script')
      se.src = "https://getfirebug.com/firebug-lite.js#startOpened=true"
      document.body.appendChild(se)
    },

    closekeyboard: function() {
      if( navigator.device ) {
        for( var i = 0; i < arguments.length; i++ ) {
          var elem = arguments[i]
          if( elem.blur ) {
            elem.blur()
          }
        }
        util.tick(function(){window.scrollTo(0,1)})
      }
    },

    refresh: function() {
      window.location.href = '/'
    },
    
    do_firmin: function( whence, domelem, firminfunc ) {
      var desc = 'firmin '+whence+' domelem='+(domelem&&domelem.id)+' ff:'+(!!firminfunc)
      //log(desc)
      if( firminfunc ) {
        util.tick(function(){
          try {
            //recordevent(whence+' domelem='+(domelem&&domelem.id))
            firminfunc()
          }
          catch(e) {
            log('ERROR '+desc+': '+e)
          }
        })
      }
    },

    enablecache: true,

    flash: function(elem,csson,cssoff) {
      if( elem ) {
        elem.css(csson)
        setTimeout(function(){
          elem.css(cssoff)
        },300)
      }
    },

    validemail: function(email) {
      return 'string' == typeof(email) && -1!=email.indexOf('@')
    },

    tick: function(f) {
      setTimeout(f,25)
    },

    die: function( note ) {
      var error = new Error(note)
      log( 'error', note, printStackTrace(error) )
      if( util.die.active ) {
        throw error
      }
    },

    delay: function(millis,func) {
      return function() {
        var args = Array.prototype.slice.call(arguments)
        setTimeout(function(){
          func.apply(this,args)
        },millis)
      }
    },

    onchange: function( spec ) {
      spec.forEach(function(change){
        change.model.bind('change:'+change.prop,function(){
          var modelname = change.model.name || change.model
          //log('onchange','fired',modelname,change.prop)
          change.trigger.forEach(function(trigger){
            //log('onchange','call',modelname,change.prop,trigger.view.name,trigger.method)
            trigger.view[trigger.method]()
          })
        })
      })
    },


    triggers: function( modelmap, viewmap, trigmap ) {
    _.keys(trigmap).forEach(function(viewname){
      var view = viewmap[viewname]
      if( !view ) throw new Error('view '+viewname+' not found in '+_.keys(viewmap));

      var viewtrigs = trigmap[viewname]

      _.keys(viewtrigs).forEach(function(methodname){
        var eventnames = viewtrigs[methodname]
        if( 'string' == typeof eventnames ) {
          eventnames = [eventnames]
        }
        
        eventnames.forEach(function(eventspec){
          var arr = eventspec.split('/')
          var modelname = arr[0]
          var eventname = arr[1]
          var model = modelmap[modelname]
          if( !model ) throw new Error('model '+modelname+' not found in '+_.keys(modelmap));

          //log('trigger','bind',modelname,eventname,view.name,methodname)
          model.bind( eventname, function() {
            //log('trigger','fired',modelname,eventname,view.name,methodname)
            view[methodname].apply( view, [modelname,eventname].concat(Array.prototype.slice(arguments)) )
          })
        })
      })
    })
    },


    makecache: function( maxitems, type, prefix, version ) {
      if('persist' == type) {
        return new LSCache(maxitems,prefix,version)
      }
      else {
        return new Cache(maxitems)
      }
    },

    hide: function(z) {
      z && z.addClass && z.addClass('hide')
    },

    show: function(z) {
      z && z.removeClass && z.removeClass('hide')
    },

    showhide: function(z,show) {
      if( show ) {
        util.show(z)
      }
      else {
        util.hide(z)
      }
    },

    pos: function(obj) {
      /*jshint boss:true */
      var curleft = 0, curtop = 0;
      if (obj.offsetParent) {
        do {
          curleft += obj.offsetLeft;
          curtop += obj.offsetTop;
        } while (obj = obj.offsetParent);
        return [curleft,curtop];
      }
    },

    movedoc: function( hashval ) {
      var href = window.location.href
      var hash = href.indexOf('#')
      href = -1 == hash ? href : href.substring(0,hash)
      href += '#!'+hashval
      window.location.replace(href)
    },

    hash: function( newval ) {
      if( null !== newval ) { 
        return (window.location.hash = util.lasthash = newval);
      }
      else {
        return window.location.hash
      }
      //var href = window.location.href
      //var hash = href.indexOf('#')
      //return -1 == hash ? '' : href.substring(hash+1)
    },


    lasthash: window.location.hash,


    stack: function() {
      try { throw new Error('here') } catch( ex ) { return ex }
    },

    enterkey: function (cb) {
      return function(event) {
        if( 13 == event.keyCode ) {
          cb()
        }
      }
    },


    http_cookies: {},
    http_headers: {},

    http_update_cookies: function() {
      for( var cn in util.http_cookies ) {
        var cv = encodeURIComponent(util.http_cookies[cn])
        var domain = document.location.host || document.location.hostname || C.host
        //var m = /\.([^.]+\.[^.]+)$/.exec(domain)
        //domain = m ? m[1] : domain
        var d = new Date(); d.setTime(d.getTime()+(20*365*24*60*60*1000));
        var cstr = cn+'='+cv+'; path=/; domain='+domain+'; expires='+d.toGMTString()
        document.cookie = cstr
        util.http_headers['X-SBP-TOKEN']=cv
      }
    },

    http_success:function(cb){
      return function(res){
        cb && cb(null,res)
      }
    },

    http_error:function(cb){
      return function(jqXHR, textStatus, errorThrown){
        var err = {status:jqXHR.status, jqXHR:jqXHR, textStatus:textStatus, errorThrown:errorThrown}
        log(err)
        cb && cb(err,null)
      }
    },

    http_post: function(url,data,cb) {
      if( navigator.device || C.forceusehost ) {
        url = 'http://'+C.host+url
      }
      //log('POST '+url)

      util.http_update_cookies()

      $.ajax({
        url:url,
        type:'POST',
        contentType:'application/json',
        data:JSON.stringify(data),
        dataType:'json',
        cache:false,
        headers:util.http_headers,
        success:util.http_success(cb),
        error:util.http_error(cb)
      })
    },

    http_get: function(url,cb) {
      if( navigator.device || C.forceusehost) {
        url = 'http://'+C.host+url
      }
      util.http_update_cookies()

      //log('GET '+url+' cookies:'+JSON.stringify(util.http_cookies)+' headers:'+JSON.stringify(util.http_headers))

      $.ajax({
        url:url,
        dataType:'json',
        cache:false,
        headers:util.http_headers,
        success:util.http_success(cb),
        error:util.http_error(cb)
      })
    },
    
    inspect: function(obj) {
      if( obj ) {
        if( 'object' == typeof(obj) ) {
          var sb
          if( $.isArray(obj) ) {
            sb = ['[']
            for( var i = 0; i < obj.length; i++ ) {
              sb.push( this.inspect(obj[i] ))
              sb.push( ', ' )
            }
            sb.push(']')
            return sb.join('')
          }
          else {
            sb = ['{']
            for( var p in obj ) {
              sb.push( p+':'+obj[p] )
              sb.push( ', ' )
            }
            sb.push(']')
            return sb.join('')
          }
        }
        return ''+obj
      }
      return ''+obj
    },

    fixhttp: function(url) {
      return slang.startsWith(url,'http://')?url:'http://'+url
    },

    seq: {


      identity: function(seq){ return seq },

      alternator: function(start) {
        return new function(){
          var index = -1
          this.next = function(){
            index++
            return start + Math.ceil( (index * (2*( (index%2)-0.5 )))/2 )
          }
        }
      },

      repeat: function( val ) {
        return new function(){
          this.next = function(){
            return val
          }
        }
      },
      
      filter: function(seq,f) {
        return new function(){
          this.next = function(){
            var out
            var undefcount = 0
            while( undefined !== (out = seq.next()) ) {
              out = f(out)
              if( undefined !== out ) {
                break;
              }
              else {
                undefcount++
                if( 1 < undefcount ) {
                  break;
                }
              }
            }
            return out
          }
        }
      },

      bounds: function(seq,low,high) {
        return new function(){
          this.next = function(){
            var out = seq.next()
            var res = (out < low || high < out ) ? undefined : out
            return res
          }
        }
      },

      byindex: function(seq,source) {
        return new function(){
          this.next = function(){
            var index = seq.next()
            var out
            if( undefined !== index ) {
              out = source[index]
            }
            return out
          }
        }        
      },

      explicit: function( sizes ) {
        if( sizes.next ) return sizes
        var chunk = this.chunk
        var sizesarr = Array.isArray(sizes) ? sizes : [0+sizes]
        return new function(){
          var index = 0
          this.next = function(){
            return sizesarr[index++]
          }
        }
      },

      // -1: chunk until seq ends - will infinite loop if it doesn't!
      chunk: function( seq, sizer ) {
        var sizeseq = sizer.next ? sizer : Array.isArray(sizer) ? this.explicit(sizer) : this.repeat(sizer)
        return new function(){
          this.next = function(){
            var out = []
            var size = sizeseq.next()
            for( var i = 0; undefined !== size && (-1 == size || i < size); i++ ) {
              var n = seq.next()
              if( undefined === n ) {
                break;
              }
              else {
                out.push(n)
              }
            }
            return 0 === out.length ? undefined : out
          }
        }
      },

      tostring: function( seq ) {
        return new function(){
          this.next = function(){
            var out = seq.next()
            return undefined === out ? undefined : ''+out
          }
        }
      }

    }
  }

})()