/*
Copyright 2015, 2016 OpenMarket Ltd

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

'use strict';
var React = require('react');
var q = require("q");
var sdk = require('matrix-react-sdk');
var MatrixClientPeg = require('matrix-react-sdk/lib/MatrixClientPeg');
var UserSettingsStore = require('matrix-react-sdk/lib/UserSettingsStore');
var Modal = require('matrix-react-sdk/lib/Modal');

/**
 * Enum for state of a push rule as defined by the Vector UI.
 * @readonly
 * @enum {string}
 */
var PushRuleVectorState = {
    /** The user will receive push notification for this rule */
    ON: "on",
    /** The user will receive push notification for this rule with sound and
        highlight if this is legitimate */
    LOUD: "loud",
    /** The push rule is disabled */
    OFF: "off"
};

module.exports = React.createClass({
    displayName: 'Notififications',

    phases: {
        LOADING: "LOADING", // The component is loading or sending data to the hs
        DISPLAY: "DISPLAY", // The component is ready and display data
        ERROR: "ERROR"      // There was an error
    },
    
    getInitialState: function() {
        return {
            phase: this.phases.LOADING,
            masterPushRule: undefined,      // The master rule ('.m.rule.master')
            vectorPushRules: [],            // HS default push rules displayed in Vector UI
            vectorContentRules: {           // Keyword push rules displayed in Vector UI
                vectorState: PushRuleVectorState.ON,
                rules: []
            },
            externalContentRules: []        // Keyword push rules that have been defined outside Vector UI
        };
    },
    
    componentWillMount: function() {
        this._refreshFromServer();
    },
    
    onEnableNotificationsChange: function(event) {
        var self = this;
        this.setState({
            phase: this.phases.LOADING
        });

        MatrixClientPeg.get().setPushRuleEnabled('global', self.state.masterPushRule.kind, self.state.masterPushRule.rule_id, !event.target.checked).done(function() {
           self._refreshFromServer();
        });
    },
    
    onEnableDesktopNotificationsChange: function(event) {
        UserSettingsStore.setEnableNotifications(event.target.checked);
    },
    
    onNotifStateButtonClicked: function(event) {
        var vectorRuleId = event.target.className.split("-")[0];
        var newPushRuleVectorState = event.target.className.split("-")[1];
        
        if ("keywords" === vectorRuleId) {
            this._changeKeywordsPushRuleVectorState(newPushRuleVectorState)
        }
        else {
            var rule = this.getRule(vectorRuleId);
            if (rule) {
                this._changePushRuleVectorState(rule, newPushRuleVectorState);
            }
        }
    },
    
    onKeywordsClicked: function(event) {
        var self = this;

        // Compute the keywords list to display
        var keywords = [];
        for (var i in this.state.vectorContentRules.rules) {
            var rule = this.state.vectorContentRules.rules[i];
            keywords.push(rule.pattern);
        }
        if (keywords.length) {
            // As keeping the order of per-word push rules hs side is a bit tricky to code,
            // display the keywords in alphabetical order to the user
            keywords.sort();

            keywords = keywords.join(", ");
        }
        else {
            keywords = "";
        }

        var TextInputDialog = sdk.getComponent("dialogs.TextInputDialog");
        Modal.createDialog(TextInputDialog, {
            title: "Keywords",
            description: "Enter keywords separated by a comma:",
            value: keywords,
            onFinished: function onFinished(should_leave, newValue) {

                if (should_leave && newValue !== keywords) {
                    var newKeywords = newValue.split(',');
                    for (var i in newKeywords) {
                        newKeywords[i] = newKeywords[i].trim();
                    }

                    // Remove duplicates and empty
                    newKeywords = newKeywords.reduce(function(array, keyword){
                        if (keyword !== "" && array.indexOf(keyword) < 0) {
                            array.push(keyword);
                        }
                        return array;
                    },[]);
                    
                    self._updateKeywords(newKeywords);
                }
            }
        });
    },
    
    getRule: function(vectorRuleId) {
        for (var i in this.state.vectorPushRules) {
            var rule = this.state.vectorPushRules[i];
            if (rule.vectorRuleId === vectorRuleId) {
                return rule;
            }
        }
    },
    
    _actionsFor: function(pushRuleVectorState) {
        if (pushRuleVectorState === PushRuleVectorState.ON) {
            return ['notify'];
        }
        else if (pushRuleVectorState === PushRuleVectorState.LOUD) {
            return ['notify',
                {'set_tweak': 'sound', 'value': 'default'},
                {'set_tweak': 'highlight', 'value': 'true'}
            ];;
        }
    },
    
    // Determine whether a rule is in the PushRuleVectorState.ON category or in PushRuleVectorState.LOUD
    // regardless of its enabled state.
    _pushRuleVectorStateKind: function(rule) {
        var stateKind;
 
        // Count tweaks to determine if it is a ON or LOUD rule
        var tweaks = 0;
        for (var j in rule.actions) {
            var action = rule.actions[j];
            if (action.set_tweak === 'sound' ||
                (action.set_tweak === 'highlight' &&  action.value)) {
                tweaks++;
            }
        }
        switch (tweaks) {
            case 0:
                stateKind = PushRuleVectorState.ON;
                break;
            case 2:
                stateKind = PushRuleVectorState.LOUD;
                break;
        }
        return stateKind;
    },
    
    _changePushRuleVectorState: function(rule, newPushRuleVectorState) {        
        // For now, we support only enabled/disabled for hs default rules
        // Translate ON, LOUD, OFF to one of the 2.
        if (rule && rule.vectorState !== newPushRuleVectorState) {   

            this.setState({
                phase: this.phases.LOADING
            });

            var self = this;
            MatrixClientPeg.get().setPushRuleEnabled('global', rule.rule.kind, rule.rule.rule_id, (newPushRuleVectorState !== PushRuleVectorState.OFF)).done(function() {
                self._refreshFromServer();
            });
        }
    },
    
    _changeKeywordsPushRuleVectorState: function(newPushRuleVectorState) {
        // Is there really a change?
        if (this.state.vectorContentRules.vectorState === newPushRuleVectorState 
            || this.state.vectorContentRules.rules.length === 0) {
            return;
        }
        
        var self = this;
        var cli = MatrixClientPeg.get();

        this.setState({
            phase: this.phases.LOADING
        });

        // Update all rules in self.state.vectorContentRules
        var deferreds = [];
        for (var i in this.state.vectorContentRules.rules) {
            var rule = this.state.vectorContentRules.rules[i];

            var enabled;
            var actions;
            switch (newPushRuleVectorState) {
                case PushRuleVectorState.ON:
                    if (rule.actions.length !== 1) {
                        actions = this._actionsFor(PushRuleVectorState.ON);
                    }

                    if (this.state.vectorContentRules.vectorState === PushRuleVectorState.OFF) {
                        enabled = true;
                    }
                    break;

                case PushRuleVectorState.LOUD:
                    if (rule.actions.length !== 3) {
                        actions = this._actionsFor(PushRuleVectorState.LOUD);
                    }

                    if (this.state.vectorContentRules.vectorState === PushRuleVectorState.OFF) {
                        enabled = true;
                    }
                    break;

                case PushRuleVectorState.OFF:
                    enabled = false;
                    break;
            }

            if (actions) {
                // Note that the workaround in _updatePushRuleActions will automatically
                // enable the rule
                deferreds.push(this._updatePushRuleActions(rule, actions, enabled));
            }
            else if (enabled != undefined) {
                deferreds.push(cli.setPushRuleEnabled('global', rule.kind, rule.rule_id, enabled));
            }
        }

        q.all(deferreds).done(function(resps) {
            self._refreshFromServer();
        }, function(error) {
            var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
            Modal.createDialog(ErrorDialog, {
                title: "Can't update user notification settings",
                description: error.toString(),
                onFinished: self._refreshFromServer
            });
        });
    },
    
    _updateKeywords: function(newKeywords) {
        this.setState({
            phase: this.phases.LOADING
        });

        var self = this;
        var cli = MatrixClientPeg.get();
        var removeDeferreds = [];

        // Remove per-word push rules of keywords that are no more in the list
        var vectorContentRulesPatterns = [];
        for (var i in self.state.vectorContentRules.rules) {
            var rule = self.state.vectorContentRules.rules[i];

            vectorContentRulesPatterns.push(rule.pattern);

            if (newKeywords.indexOf(rule.pattern) < 0) {
                removeDeferreds.push(cli.deletePushRule('global', rule.kind, rule.rule_id));
            }
        }

        // If the keyword is part of `externalContentRules`, remove the rule
        // before recreating it in the right Vector path
        for (var i in self.state.externalContentRules) {
            var rule = self.state.externalContentRules[i];

            if (newKeywords.indexOf(rule.pattern) >= 0) {
                removeDeferreds.push(cli.deletePushRule('global', rule.kind, rule.rule_id));
            }
        }

        var onError = function(error) {
            var ErrorDialog = sdk.getComponent("dialogs.ErrorDialog");
            Modal.createDialog(ErrorDialog, {
                title: "Can't update keywords",
                description: error.toString(),
                onFinished: self._refreshFromServer
            });
        }

        // Then, add the new ones
        q.all(removeDeferreds).done(function(resps) {
            var deferreds = [];
            for (var i in newKeywords) {
                var keyword = newKeywords[i];

                var pushRuleVectorStateKind = self.state.vectorContentRules.vectorState;
                if (pushRuleVectorStateKind === PushRuleVectorState.OFF) {
                    // When the current global keywords rule is OFF, we need to look at
                    // the flavor of rules in 'vectorContentRules' to apply the same actions 
                    // when creating the new rule.
                    // Thus, this new rule will join the 'vectorContentRules' set. 
                    if (self.state.vectorContentRules.rules.length) {
                        pushRuleVectorStateKind = self._pushRuleVectorStateKind(self.state.vectorContentRules.rules[0]);
                    }
                    else {
                        // ON is default
                        pushRuleVectorStateKind =  PushRuleVectorState.ON;
                    }
                }

                if (vectorContentRulesPatterns.indexOf(keyword) < 0) {
                    deferreds.push(cli.addPushRule('global', 'content', keyword, {
                        actions: self._actionsFor(pushRuleVectorStateKind),
                        pattern: keyword
                    }));
                }
            }

            q.all(deferreds).done(function(resps) {
                self._refreshFromServer();
            }, onError);
        }, onError);
    },

    _refreshFromServer: function() {
        var self = this;  
        MatrixClientPeg.get().getPushRules().done(function(rulesets) {
            MatrixClientPeg.get().pushRules = rulesets;

            // Get homeserver default rules expected by Vector
            var rule_categories = {
                '.m.rule.master': 'master',

                '.m.rule.contains_display_name': 'vector',
                '.m.rule.room_one_to_one': 'vector',
                '.m.rule.invite_for_me': 'vector',
                '.m.rule.member_event': 'vector',
                '.m.rule.call': 'vector',
            };

            // HS default rules
            var defaultRules = {master: [], vector: {}, additional: [], fallthrough: [], suppression: []};
            //  Content/keyword rules
            var contentRules = {on: [], on_but_disabled:[], loud: [], loud_but_disabled: [], other: []};

            for (var kind in rulesets.global) {
                for (var i = 0; i < Object.keys(rulesets.global[kind]).length; ++i) {
                    var r = rulesets.global[kind][i];
                    var cat = rule_categories[r.rule_id];
                    r.kind = kind;
                    if (r.rule_id[0] === '.') {
                        if (cat) {
                            if (cat === 'vector')
                            {
                                defaultRules.vector[r.rule_id] = r;
                            }
                            else
                            {
                                defaultRules[cat].push(r);
                            }
                        } else {
                            defaultRules.additional.push(r);
                        }
                    }
                    else if (kind === 'content') {
                        switch (self._pushRuleVectorStateKind(r)) {
                            case PushRuleVectorState.ON:
                                if (r.enabled) {
                                    contentRules.on.push(r);
                                }
                                else {
                                    contentRules.on_but_disabled.push(r);
                                }
                                break;
                            case PushRuleVectorState.LOUD:
                                if (r.enabled) {
                                    contentRules.loud.push(r);
                                }
                                else {
                                    contentRules.loud_but_disabled.push(r);
                                }
                                break;
                            default:
                                contentRules.other.push(r);
                                break;
                        }
                    }
                }
            }

            // Decide which content rules to display in Vector UI.
            // Vector displays a single global rule for a list of keywords
            // whereas Matrix has a push rule per keyword.
            // Vector can set the unique rule in ON, LOUD or OFF state.
            // Matrix has enabled/disabled plus a combination of (highlight, sound) tweaks.
            
            // The code below determines which set of user's content push rules can be 
            // displayed by the vector UI.
            // Push rules that does not fit, ie defined by another Matrix client, ends
            // in self.state.externalContentRules.
            // There is priority in the determination of which set will be the displayed one.
            // The set with rules that have LOUD tweaks is the first choice. Then, the ones
            // with ON tweaks (no tweaks).
            if (contentRules.loud.length) {
                self.state.vectorContentRules = {
                    vectorState: PushRuleVectorState.LOUD,
                    rules: contentRules.loud
                } 
               self.state.externalContentRules = [].concat(contentRules.loud_but_disabled, contentRules.on, contentRules.on_but_disabled, contentRules.other);
            }
            else if (contentRules.loud_but_disabled.length) {
                self.state.vectorContentRules = {
                    vectorState: PushRuleVectorState.OFF,
                    rules: contentRules.loud_but_disabled
                } 
               self.state.externalContentRules = [].concat(contentRules.on, contentRules.on_but_disabled, contentRules.other);
            }
            else if (contentRules.on.length) {
                self.state.vectorContentRules = {
                    vectorState: PushRuleVectorState.ON,
                    rules: contentRules.on
                }
                self.state.externalContentRules = [].concat(contentRules.on_but_disabled, contentRules.other);
            }
            else if (contentRules.on_but_disabled.length) {
                self.state.vectorContentRules = {
                    vectorState: PushRuleVectorState.OFF,
                    rules: contentRules.on_but_disabled
                }
                self.state.externalContentRules = contentRules.other;
            }
            else {
                self.state.externalContentRules = contentRules.other;
            }

            // Get the master rule if any defined by the hs
            if (defaultRules.master.length > 0) {
                self.state.masterPushRule = defaultRules.master[0];
            }

            // Build the rules displayed in Vector UI matrix table
            self.state.vectorPushRules = [];
            var rule, vectorState;

            // Messages containing user's display name 
            // (skip contains_user_name which is too geeky)
            rule = defaultRules.vector['.m.rule.contains_display_name'];
            vectorState = (rule && rule.enabled) ? PushRuleVectorState.LOUD : PushRuleVectorState.OFF;
            self.state.vectorPushRules.push({
                "vectorRuleId": "contains_display_name",
                "description" : "Messages containing my name",
                "rule": rule,
                "vectorState": vectorState,
                "disabled": PushRuleVectorState.ON
            });

            // Messages containing keywords
            // For Vector UI, this is a single global push rule but translated in Matrix,
            // it corresponds to all content push rules (stored in self.state.vectorContentRule)
            self.state.vectorPushRules.push({
                "vectorRuleId": "keywords",
                "description" : (<span>Messages containing <span className="mx_UserNotifSettings_keywords" onClick={ self.onKeywordsClicked }>keywords</span></span>),
                "vectorState": self.state.vectorContentRules.vectorState
            });

            // Messages just sent to the user
            rule = defaultRules.vector['.m.rule.room_one_to_one'];
            vectorState = (rule && rule.enabled) ? PushRuleVectorState.LOUD : PushRuleVectorState.OFF;
            self.state.vectorPushRules.push({
                "vectorRuleId": "room_one_to_one",
                "description" : "Messages just sent to me",
                "rule": rule,
                "vectorState": vectorState,
                "disabled": PushRuleVectorState.ON
            });

            // Invitation for the user
            rule = defaultRules.vector['.m.rule.invite_for_me'];
            vectorState = (rule && rule.enabled) ? PushRuleVectorState.LOUD : PushRuleVectorState.OFF;
            self.state.vectorPushRules.push({
                "vectorRuleId": "invite_for_me",
                "description" : "When I'm invited to a room",
                "rule": rule,
                "vectorState": vectorState,
                "disabled": PushRuleVectorState.ON
            });

            // When people join or leave a room
            rule = defaultRules.vector['.m.rule.member_event'];
            vectorState = (rule && rule.enabled) ? PushRuleVectorState.ON : PushRuleVectorState.OFF;
            self.state.vectorPushRules.push({
                "vectorRuleId": "member_event",
                "description" : "When people join or leave a room",
                "rule": rule,
                "vectorState": vectorState,
                "disabled": PushRuleVectorState.LOUD
            });

            // Incoming call
            rule = defaultRules.vector['.m.rule.call'];
            vectorState = (rule && rule.enabled) ? PushRuleVectorState.LOUD : PushRuleVectorState.OFF;
            self.state.vectorPushRules.push({
                "vectorRuleId": "call",
                "description" : "Call invitation",
                "rule": rule,
                "vectorState": vectorState,
                "disabled": PushRuleVectorState.ON
            });
            
            self.setState({
                phase: self.phases.DISPLAY
            });
        });
    },
    
    _updatePushRuleActions: function(rule, actions, enabled) {
        // Workaround for SYN-590 : Push rule update fails
        // Remove the rule and recreate it with the new actions
        var cli = MatrixClientPeg.get();
        var deferred = q.defer();
        
        cli.deletePushRule('global', rule.kind, rule.rule_id).done(function() {
            cli.addPushRule('global', rule.kind, rule.rule_id, {
                actions: actions,
                pattern: rule.pattern
            }).done(function() {

                // Then, if requested, enabled or disabled the rule
                if (undefined != enabled) {
                    cli.setPushRuleEnabled('global', rule.kind, rule.rule_id, enabled).done(function() {
                        deferred.resolve();
                    }, function(err) {
                        deferred.reject(err);
                    });
                }
                else {  
                    deferred.resolve();
                }
            }, function(err) {
                deferred.reject(err);
            });
        }, function(err) {
            deferred.reject(err);
        });  
        
        return deferred.promise;
    },
    
    renderNotifRulesTableRow: function(title, className, pushRuleVectorState, disabled) {
        return (
            <tr key = {className}>
                <th>
                    {title}
                </th>

                <th>
                    <input className= {className + "-" + PushRuleVectorState.ON}
                        type="radio"
                        checked={ pushRuleVectorState === PushRuleVectorState.ON }
                        disabled= { (disabled === PushRuleVectorState.ON) ? "disabled" : false }
                        onChange={ this.onNotifStateButtonClicked } />
                </th>

                <th>
                    <input className= {className + "-" + PushRuleVectorState.LOUD}
                        type="radio"
                        checked={ pushRuleVectorState === PushRuleVectorState.LOUD }
                        disabled= { (disabled === PushRuleVectorState.LOUD) ? "disabled" : false }
                        onChange={ this.onNotifStateButtonClicked } />
                </th>

                <th>
                    <input className= {className + "-" + PushRuleVectorState.OFF}
                        type="radio"
                        checked={ pushRuleVectorState === PushRuleVectorState.OFF }
                        disabled= { (disabled === PushRuleVectorState.OFF) ? "disabled" : false }
                        onChange={ this.onNotifStateButtonClicked } />
                </th>
            </tr>
        );
    },
    
    renderNotifRulesTableRows: function() {
        var rows = [];
        for (var i in this.state.vectorPushRules) {
            var rule = this.state.vectorPushRules[i];
            rows.push(this.renderNotifRulesTableRow(rule.description, rule.vectorRuleId, rule.vectorState, rule.disabled));
        }
        return rows;
    },

    render: function() { 
        var self = this;

        if (this.state.phase === this.phases.LOADING) {
            var Loader = sdk.getComponent("elements.Spinner");
            return (
                <div className="mx_UserSettings_notifTable">
                    <Loader />
                </div>
            );
        }

        if (this.state.masterPushRule) {
            var masterPushRuleDiv = (
                <div className="mx_UserNotifSettings_tableRow">
                        <div className="mx_UserNotifSettings_inputCell">
                            <input id="enableNotifications"
                                ref="enableNotifications"
                                type="checkbox"
                                checked={ !this.state.masterPushRule.enabled }
                                onChange={ this.onEnableNotificationsChange } />
                        </div>
                        <div className="mx_UserNotifSettings_labelCell">
                            <label htmlFor="enableNotifications">
                                Enable notifications
                            </label>
                        </div>
                    </div>
            );
        }

        // When enabled, the master rule inhibits all existing rules
        if (this.state.masterPushRule.enabled) {
            return (
                <div>
                    {masterPushRuleDiv}

                    <div className="mx_UserSettings_notifTable">
                        All notifications are currently disabled for all devices.
                    </div>
                </div>
            );
        }

        // Build the list of keywords rules that have been defined outside Vector UI
        var externalKeyWords = [];
        for (var i in this.state.externalContentRules) {
            var rule = this.state.externalContentRules[i];
            externalKeyWords.push(rule.pattern);
        }
        
        if (externalKeyWords.length) {
            externalKeyWords = externalKeyWords.join(", ");
        }
        
        return (
            <div>

                {masterPushRuleDiv}

                <div className="mx_UserSettings_notifTable">

                    <div className="mx_UserNotifSettings_tableRow">
                        <div className="mx_UserNotifSettings_inputCell">
                            <input id="enableDesktopNotifications"
                                ref="enableDesktopNotifications"
                                type="checkbox"
                                checked={ UserSettingsStore.getEnableNotifications() }
                                onChange={ this.onEnableDesktopNotificationsChange } />
                        </div>
                        <div className="mx_UserNotifSettings_labelCell">
                            <label htmlFor="enableDesktopNotifications">
                                Enable desktop notifications
                            </label>
                        </div>
                    </div>

                    <h3>General use</h3>

                    <div className="mx_UserNotifSettings_pushRulesTableWrapper">
                        <table className="mx_UserNotifSettings_pushRulesTable">
                            <thead>
                                <tr>
                                    <th width="55%"></th>
                                    <th width="15%">On</th>
                                    <th width="15%">Loud</th>
                                    <th width="15%">Off</th>
                                </tr>
                            </thead>
                            <tbody>

                                { this.renderNotifRulesTableRows() }

                            </tbody>
                        </table>
                    </div>

                </div>

                <div>
                    <br/><br/>
                    Warning: Push rules on the following keywords has been defined: <br/>
                    { externalKeyWords }
                </div>

            </div>
        );
    }
});