"use strict";

angular.module("vocabulary")
    .service("utilService", ["$rootScope", "$state", "$location", function ($rootScope, $state, $location) {

        var applicationName = "Vocabulary A-Z";
        var suffix = " | " + applicationName;
        var maxTitleLength = 75;

        return {
            setTitle: setTitle,
            setTitleFromFirstH1IfAny: setTitleFromFirstH1IfAny,
            setMetaDescriptionFromState: setMetaDescriptionFromState,
            setMetaDescriptionFromPath: setMetaDescriptionFromPath
        };

        function setTitle(givenText) {
            if (givenText) {
                $rootScope.title = givenText.substring(givenText, maxTitleLength - suffix.length) + suffix;
            } else {
                $rootScope.title = applicationName;
            }
        }

        function setTitleFromFirstH1IfAny() {
            var firstH1 = angular.element("h1:first")
                .clone()    //clone the element
                .children() //select all the children
                .remove()   //remove all the children
                .end()  //again go back to selected element
                .text()
                .trim();
            if (firstH1) {
                setTitle(firstH1);
            }
        }

        function isOrHasParent(state, stateName) {
            if (!state) {
                return false;
            }
            if (state.name === stateName) {
                return true;
            }
            if (!state.parent) {
                return false;
            }
            return isOrHasParent(state.parent, stateName);
        }

        function setMetaDescriptionFromState() {
            var state = $state.$current;
            var url = $location.absUrl();
            if (url.indexOf("/main/") >= 0) {
                return;
            }
            if (isOrHasParent(state, 'home')) {
                $rootScope.metaDescription = "Teach vocabulary in context with premade and customizable vocabulary lessons. Students extend learning beyond the classroom with game-based activities.";
            } else if (isOrHasParent(state, "lesson")) {
                $rootScope.metaDescription = "Create your own vocabulary lesson by browsing word lists, searching for words, or creating your own words.";
            } else if (isOrHasParent(state, "premadeLessons.razLeveledBooks")) {
                $rootScope.metaDescription = "Browse and assign ready-to-use vocabulary lessons connected to Raz-Plus leveled books, math books, and vocabulary books.";
            } else if (isOrHasParent(state, "premadeLessons.ellLanguageSkill")) {
                $rootScope.metaDescription = "Browse and assign ready-to-use vocabulary lessons connected to Raz-Plus ELL Edition language skill packs, vocabulary books, or vocabulary power packs.";
            } else if (isOrHasParent(state, "premadeLessons.science")) {
                $rootScope.metaDescription = "Browse and assign ready-to-use vocabulary lessons connected to Science A-Z Life, Earth & Space, or Physical units.";
            } else if (isOrHasParent(state, "premadeLessons.collection")) {
                $rootScope.metaDescription = "Browse and assign ready-to-use vocabulary lessons based on popular Harcourt, Macmillan, Scott Foresman, and Houghton Mifflin reading series.";
            }
        }

        function setMetaDescriptionFromPath() {
            var url = $location.absUrl();
            if (url.indexOf("main/ViewPage/name/learn-more") >= 0) {
                $rootScope.metaDescription = "Connect your vocabulary instruction to topics and content in Raz-Plus, Raz-Plus ELL Edition, and Science A-Z.";
            }  else if (url.indexOf("main/ViewPage/name/research") >= 0) {
                $rootScope.metaDescription = "Vocabulary learning based on language acquisition research. Resources support effective vocabulary instruction.";
            } else if (url.indexOf("main/ViewPage/name/get-students-reading") >= 0) {
                $rootScope.metaDescription = "Tips to get students started. Technology, student access, letter to parents, incentives & awards, and audio.";
            } else if (url.indexOf("main/ViewPage/name/student-portal") >= 0) {
                $rootScope.metaDescription = "Get to know the student portal, with assignments, interactivities and quizzes, messages, star zone, and stats.";
            } else if (url.indexOf("main/ViewPage/name/all-about-tiers") >= 0) {
                $rootScope.metaDescription = "Vocabulary analysis-based tiering system categorizes words on difficulty, specialization, frequency, and instructional potential.";
            } else if (url.indexOf("main/VideoLibrary") >= 0) {
                $rootScope.metaDescription = "Video resources for teaching vocabulary.";
            }
        }
    }]);