/* <copyright>
 This file contains proprietary software owned by Motorola Mobility, Inc.<br/>
 No rights, expressed or implied, whatsoever to this software are provided by Motorola Mobility, Inc. hereunder.<br/>
 (c) Copyright 2011 Motorola Mobility, Inc.  All Rights Reserved.
 </copyright> */
var Montage = require("montage").Montage,
    Component = require("ui/component").Component,
    TextInput = require("ui/text-input").TextInput,
    logger = require("core/logger").logger("autocomplete"),
    ResultsList = require("ui/autocomplete/results-list.reel/results-list").ResultsList,
    ArrayController = require("ui/controller/array-controller").ArrayController,
    Popup = require("ui/popup/popup.reel").Popup,
    PressComposer = require("ui/composer/press-composer").PressComposer;

var KEY_UP = 38,
    KEY_DOWN = 40,
    KEY_RIGHT = 39,
    KEY_ENTER = 13,
    KEY_ESC = 27;

var getElementPosition = function(obj) {
    var curleft = 0, curtop = 0, curHt = 0, curWd = 0;
    if (obj.offsetParent) {
        do {
            curleft += obj.offsetLeft;
            curtop += obj.offsetTop;
            curHt += obj.offsetHeight;
            curWd += obj.offsetWidth;
        } while ((obj = obj.offsetParent));
    }
    return {
        top: curtop,
        left: curleft,
        height: curHt,
        width: curWd
    };
};

/**
 * The Autocomplete input
 */
var Autocomplete = exports.Autocomplete = Montage.create(TextInput, {

    didCreate: {
        value: function() {
            this.delay = 500;
            this.minLength = 2;
        }
    },

    hasTemplate: {value: true},

    delegate: {
        value: null
    },

    /**
    * If the delegate returns Objects, this property can be used to derive the
    * display string for an object. If this property is not provided, the results
    * provided by the delegate are assumed to be String.
    */
    textPropertyPath: {
        value: null
    },

    separator: {
        value: ',',
        distinct: true
    },

    _delay: {value: null},
    delay: {
        distinct: true,
        get: function(){
            return this._delay;
        },
        set: function(value) {
            if(value !== this._delay) {
                if(String.isString(value)) {
                    value = parseInt(value, 10);
                }
                this._delay = value;
            }
        }
    },

    /**
    * Number of characters the user must type before the suggest query is fired
    * Default = 2
    */
    minLength: {
        value: null
    },

    _tokens: {value: null},
    tokens: {
        get: function() {
            return this._tokens;
        },
        set: function(value) {
            this._tokens = value;
            this._valueSyncedWithInputField = false;
            this.needsDraw = true;
        },
        modify: function(v) {
            this._tokens = v;
        },
        distinct: true
    },

    // overridden here to get the substring/searchString
    value: {
        get: function() {
            return this._value;
            //var arr = this.tokens;
            //return (arr ? arr.join(',') : this._value);
        },
        set: function(newValue, fromInput) {
            this._value = newValue ? newValue.trim() : '';

            // get the entered text after the separator
            var value = this._value;

            if(value) {
                var arr = value.split(this.separator).map(function(item) {
                    return item.trim();
                });
                this.activeTokenIndex = this._findActiveTokenIndex(this.tokens, arr);
                this._tokens = value.split(this.separator).map(function(item) {
                    return item.trim();
                });
            } else {
                this.activeTokenIndex = 0;
                this._tokens = [];
            }

            if(fromInput) {
                this._valueSyncedWithInputField = true;
                this.showPopup = false;
                if(this._tokens.length && this._tokens.length > 0) {
                    var searchTerm = this._tokens[this.activeTokenIndex];
                    searchTerm = searchTerm ? searchTerm.trim() : '';
                    if(searchTerm.length >= this.minLength) {
                        var self = this;
                        clearTimeout(this.delayTimer);
                        this.delayTimer = setTimeout(function() {
                            self.delayTimer = null;
                            if (logger.isDebug) {
                                logger.debug('SEARCH for ', searchTerm);
                            }
                            self.performSearch(searchTerm);
                        }, this.delay);
                    }
                }

            } else {
                this.showPopup = false;
                this._valueSyncedWithInputField = false;
                this.needsDraw = true;
            }
        }
    },



    //----  Private

    // width of the popup
    overlayWidth: {
        value: null,
        enumerable: false
    },

    delayTimer: {
        value: null,
        enumerable: false
    },

    // valid values are 'loading', 'complete' and 'timeout'
    // --> ResultList.loadingStatus
    _loadingStatus: {value: false, enumerable: false},
    loadingStatus: {
        enumerable: false,
        get: function() {
            return this._loadingStatus;
        },
        set: function(value) {
            this._loadingStatus = value;
            if(this._loadingStatus === 'loading') {
                this.showPopup = false;
            }
            this.needsDraw = true;
        }
    },

    // the index of the token in the tokens Array that is being worked on
    activeTokenIndex: {value: null},

    /** @private */
    _findActiveTokenIndex: {
        enumerable: false,
        value: function(before, after) {
            if(before == null || after == null) {
                return 0;
            }
            var i=0, len = after.length;
            for(i=0; i< len; i++) {
                if(i < before.length) {
                    if(before[i] === after[i]) {
                        continue;
                    } else {
                        break;
                    }
                }
            }
            return i;

        }
    },


    // -> resultsController.activeIndexes
    _activeIndexes: {value: null, enumerable: false},
    activeItemIndex: {
        enumerable: false,
        get: function() {
            if(this._activeIndexes && this._activeIndexes.length > 0) {
                return this._activeIndexes[0];
            }
            return null;
        },
        set: function(value) {
            if(value == null) {
                this._activeIndexes = [];
            } else {
                this._activeIndexes = [value];
            }

        }
    },

    _suggestedValue: {value: null},
    suggestedValue: {
        distinct: true,
        enumerable: false,
        get: function() {
            return this._suggestedValue;
        },
        set: function(aValue) {
            this._suggestedValue = aValue;
            if(aValue) {

                var arr = this.tokens || [];
                var token;

                if(String.isString(aValue)) {
                    token = aValue;
                } else {
                    if(this.textPropertyPath) {
                        token = aValue[this.textPropertyPath];
                    } else {
                        token = '';
                    }
                }

                arr[this.activeTokenIndex] = token;
                this.tokens = arr;
                this.showPopup = false;
            }
        }
    },

    // private

    popup: {
        enumerable: false,
        value: null
    },

    _showPopup: {value: null},
    showPopup: {
        enumerable: false,
        get: function() {
            return this._showPopup;
        },
        set: function(value) {
            if(value != this._showPopup) {
                this._showPopup = value;
                this.needsDraw = true;
            }
        }
    },

    // the delegate should set the suggestions.
    // suggestions -> resultsController.objects
    _suggestions: {value: null},
    suggestions: {
        enumerable: false,
        get: function() {
            return this._suggestions;
        },
        set: function(value) {
            if (logger.isDebug) {
                logger.debug('got suggestions: ', value);
            }

            this.loadingStatus = 'complete';
            this._suggestions = value;
            this.showPopup = (value && value.length > 0);
        }
    },

    // resultsController -> resultsList.contentController
    resultsController: {
        enumerable: false,
        value: null
    },

    // repetition
    resultsList: {
        enumerable: false,
        value: null
    },

    performSearch: {
        enumerable: false,
        value: function(searchTerm) {
            if(this.delegate) {
                this.resultsController.selectedIndexes = [];
                // index on the popup
                this.activeItemIndex = 0;
                this.loadingStatus = 'loading';
                var delegateFn = this.callDelegateMethod('ShouldGetSuggestions', this, searchTerm);

            }
        }
    },


    _addEventListeners: {
        enumerable: false,
        value: function() {
            this.element.addEventListener("keyup", this);
            this.element.addEventListener("input", this);
        }
    },

    _removeEventListeners: {
        enumerable: false,
        value: function() {
            this.element.removeEventListener("keyup", this);
            this.element.removeEventListener("input", this);
        }
    },

    _getPopup: {
        enumerable: false,
        value: function() {

            var popup = this.popup;

            if(!popup) {
                popup = Popup.create();
                popup.content = this.resultsList;
                popup.anchor = this.element;
                popup.delegate = this;
                // dont let the popup take away the focus
                // we need the focus on the textfield
                popup.focusOnShow = false;
                this.popup = popup;
            }
            return this.popup;

        }
    },

    // Delegate method to position the suggest popup
    willPositionPopup: {
        value: function(popup, defaultPosition) {
            var anchor = popup.anchorElement, anchorPosition = getElementPosition(anchor);
            return {
                left: anchorPosition.left,
                top: anchorPosition.top + 30
            };

        }
    },

    prepareForDraw: {
        value: function() {
            this._addEventListeners();
            this.element.classList.add('montage-autocomplete');

            // create the Repetition for the suggestions
            this.resultsController = ArrayController.create();
            Object.defineBinding(this.resultsController, "content", {
                boundObject: this,
                boundObjectPropertyPath: "suggestions",
                oneway: true
            });

            Object.defineBinding(this, "suggestedValue", {
                boundObject: this.resultsController,
                boundObjectPropertyPath: "selectedObjects.0",
                oneway: true
            });

            this.resultsList = ResultsList.create();
            Object.defineBinding(this.resultsList, "contentController", {
                boundObject: this,
                boundObjectPropertyPath: "resultsController",
                oneway: true
            });

            Object.defineBinding(this.resultsList, "activeIndexes", {
                boundObject: this,
                boundObjectPropertyPath: "_activeIndexes",
                oneway: true
            });
            Object.defineBinding(this.resultsList, "textPropertyPath", {
                boundObject: this,
                boundObjectPropertyPath: "textPropertyPath",
                oneway: true
            });

            var popup = this._getPopup();
        }
    },

    prepareForActivationEvents: {
        value: function() {
            // add pressComposer to handle the claimPointer related work
            var pressComposer = PressComposer.create();
            this.addComposer(pressComposer);
        }
    },

    draw: {
        value: function() {
            var el = this.element;

            var fn = Object.getPrototypeOf(Autocomplete).draw;
            fn.call(this);

            if (!this._valueSyncedWithInputField) {
                this.value = this.tokens.join(this.separator);
                if(this.value && this.value.charAt(this.value.length-1) != this.separator) {
                    this.value += this.separator;
                }
                this.element.value = this.value;
                this._valueSyncedWithInputField = true;
            }
            var showPopup = this.showPopup;
            if(this.value === '') {
                showPopup = false;
            }

            if(showPopup) {
                this.popup.show();
                // reset active index
                this.activeItemIndex = 0;
            } else {
                if(this.popup && this.popup.displayed) {
                    this.popup.hide();
                }
            }

            var isLoading = (this.loadingStatus === 'loading');
            this.element.classList[isLoading ? 'add' : 'remove']('montage-autocomplete-loading');


        }
    },


    handleKeyup: {
        enumerable: false,
        value: function(e) {
            var code = e.keyCode, popup = this._getPopup();

            switch(code) {
                case KEY_DOWN:
                if(!popup.displayed) {
                    popup.show();
                    this.activeItemIndex = 0;
                } else {
                    var list = this.suggestions || [];
                    if(list.length > 0 && this.activeItemIndex < list.length-1) {
                        this.activeItemIndex++;
                    } else {
                        this.activeItemIndex = 0;
                    }

                }

                break;

                case KEY_UP:
                if(popup.displayed === true) {
                    if(this.activeItemIndex > 0) {
                        this.activeItemIndex --;
                    } else {
                        this.activeItemIndex = 0;
                    }
                }

                break;

                case KEY_ENTER:
                if(popup.displayed === true) {
                    this.resultsController.selectedIndexes = [this.activeItemIndex];
                    e.preventDefault();
                    // select the currently active item in the results list
                } else {
                    this.suggestedValue = this.tokens[this.tokens.length-1];
                }

                break;

            }
            this.element.focus();
        }
    }

});