var repoindex = (function(repoindex) {

    repoindex.removeFilterButtonHtml = '<button type="button" class="close" onclick="repoindex.pageManager.applySearchTerm(null, false, true, true);" aria-label="Close"><span aria-hidden="true">&times;</span></button>';

    repoindex.Entry = function(name, info, enabled) {
        // basic initialization
        this.name = name;
        this.info = info;
        this.enabled = enabled;

        // callback for changed status
        this.statusChanged = function() {};

        // row element
        this.rowElement = document.createElement("tr");
        this.rowElement.entry = this;
        this.rowElement.addCell = function(text) {
            var cellElement = document.createElement("td");
            if(text) {
                cellElement.appendChild(document.createTextNode(text));
            }
            this.appendChild(cellElement);
        };
        this.initTableRow = function() {};
        this.updateTableRow = function() {
            this.rowElement.wipeChildren();
            this.initTableRow();
        };

        this.add = function(parent) {
            parent.appendChild(this.rowElement);
        };

        this.remove = function() {
            this.rowElement.parentNode.removeChild(this.rowElement);
        };

        this.hide = function() {
            this.rowElement.style.display = "none";
        };

        this.show = function() {
            this.rowElement.style.display = "table-row";
        };

        this.updateEnabled = function() {};

        this.contained = function(names, searchDescription) {
            for(var i = 0, len = names.length; i < len; ++i) {
                if(this.name.contains(names[i])) {
                    return true;
                } else if(searchDescription && this.info.desc && this.info.desc.contains(names[i])) {
                    // this doesn't work yet because only descriptions of entries which have already
                    // been shown are available
                    return true;
                }
            }
            return false;
        };
    };

    repoindex.EntryManager = function(EntryType, entryContainer, pagination) {
        // basic initialization
        this.EntryType = EntryType;
        this.entryContainer = entryContainer;
        this.entries = [];
        this.pageName = undefined;
        this.updateRequired = false;

        // init pagination
        if((this.pagination = pagination)) {
            this.pagination.entryManager = this;
        }

        // stuff for the filter
        this.filteredEntries = [];
        this.filterName = undefined;
        this.filterNames = undefined;
        this.filterNameExact = false;
        this.filterNameInDesc = false;
        this.filterRepos = undefined;
        this.filterDescr = undefined;
        this.customSelection = undefined;
        this.customSelectionName = undefined;
        this.customSelectionNamePlural = undefined;
        this.customSelectionInfoText = undefined;

        // define some phrases for info text
        this.entryName = "entry";
        this.entryNamePlural = "entries";
        this.containerName = undefined;
        this.containerNamePlural = undefined;
        this.getContainerQuantity = function() { return 0; };

        // define default filter predicate
        this.filterPred = function(entry) {
            return (!this.filterNames || this.filterNames.length === 0 || (this.filterNameExact ? this.filterNames.contains(entry.name) : entry.contained(this.filterNames, this.filterNameInDesc)))
                    && (!this.filterRepos || this.filterRepos.contains(entry.info.repo));
        };

        // provide functions to apply filter and upgrade UI
        this.applyFilter = function() {
            if((this.filterName || this.filterRepos) && this.filterPred) {
                // split filterName into filterNames
                this.filterNames = this.filterName ? this.filterName.split(" ") : undefined;
                this.filteredEntries = this.relevantEntries().filter(this.filterPred, this);
            } else {
                this.filteredEntries = this.relevantEntries();
            }
            // upgrade pagination (the pageSelected method defined above will be invoked here automatically)
            this.pagination.entryCount = this.filteredEntries.length;
            this.pagination.update();
        };

        this.removeFilter = function() {
            this.filterName = undefined;
            this.filterDescr = undefined;
            this.customSelection = undefined;
        };

        this.refreshInfo = function() {};

        this.invalidate = function() {
            this.updateRequired = true;
            this.update();
        };

        this.update = function() {
            if(this.updateRequired && (!this.pageName || this.pageName === repoindex.pageManager.currentPage)) {
                this.applyFilter();
                this.infoBox.innerHTML = this.infoText();
                this.updateRequired = false;
            }
        };

        this.removeEntries = function() {
            this.entries = [];
            this.filteredEntries = [];
            this.entryContainer.wipeChildren();
        };

        this.updateEnabledForAll = function(enabled) {
            for(var i = 0; i < this.entries.length; ++i) {
                this.entries[i].updateEnabled(enabled);
            }
        };

        this.infoText = function() {
            var containerText = "";
            if(this.containerName && this.containerNamePlural && !this.customSelection) {
                var containerQuantity = this.getContainerQuantity();
                containerText = containerQuantity === 1 ? " in one " + this.containerName : " in " + containerQuantity + " " + this.containerNamePlural;
            }
            if(this.customSelection && this.customSelectionInfoText) {
                return this.customSelectionInfoText;
            } else {
                var entryText = this.customSelection ? (this.filteredEntries.length === 1 ? this.customSelectionName : this.customSelectionNamePlural) : (this.filteredEntries.length === 1 ? this.entryName : this.entryNamePlural);
                if(this.filterDescr) {
                    if(this.filterName) {
                        return "<b>" + this.filteredEntries.length + "</b> " + entryText
                                + containerText + " "
                                + repoindex.escapeHtml(this.filterDescr) + " <i>"+ repoindex.escapeHtml(this.filterName) + "</i>."
                                + repoindex.removeFilterButtonHtml;
                    } else {
                        return "<b>" + this.filteredEntries.length + "</b> " + entryText
                                + containerText + " "
                                + repoindex.escapeHtml(this.filterDescr) + "."
                                + repoindex.removeFilterButtonHtml;
                    }
                } else {
                    return "Showing <b>"
                            + this.filteredEntries.length + "</b> "
                            + entryText
                            + containerText + ".";
                }
            }
        };

        this.relevantEntries = function() {
            return this.customSelection ? this.customSelection : this.entries;
        };

        this.entryByIndex = function(entryIndex) {
            if(entryIndex >= 0) {
                if(this.customSelection) {
                    if(entryIndex < this.customSelection.length) {
                        return this.customSelection[entryIndex];
                    }
                } else {
                    if(entryIndex < this.entries.length) {
                        return this.entries[entryIndex];
                    }
                }
            }
        };

        this.entryByName = function(entryName) {
            if(this.customSelection) {
                for(var i = 0; i < this.customSelection.length; ++i) {
                    var entry = this.customSelection[i];
                    if(entry.name === entryName) {
                        return entry;
                    }
                }
            } else {
                for(var i = 0; i < this.entries.length; ++i) {
                    var entry = this.entries[i];
                    if(entry.name === entryName) {
                        return entry;
                    }
                }
            }
        };

        // function called by the ALPM client when requested data is available
        this.useRequestedData = function() {
            this.invalidate();
        };
    };

    // useful helper methods in the context of entry management
    repoindex.entryManagerGetRepoQuantity = function() {
        return this.filterRepos ? this.filterRepos.length : repoindex.pageManager.repoManager.entries.length;
    };

    return repoindex;

})(repoindex || {});