"use strict";

const sql = require('../sql');
const utils = require('../../services/utils');

const LABEL = 'label';
const RELATION = 'relation';

class Note {
    constructor(row) {
        this.updateFromRow(row);
        this.init();
    }

    updateFromRow(row) {
        this.update([
            row.noteId,
            row.title,
            row.type,
            row.mime
        ]);
    }

    update([noteId, title, type, mime]) {
        /** @param {string} */
        this.noteId = noteId;
        /** @param {string} */
        this.title = title;
        /** @param {string} */
        this.type = type;
        /** @param {string} */
        this.mime = mime;

        return this;
    }

    init() {
        /** @param {Branch[]} */
        this.parentBranches = [];
        /** @param {Note[]} */
        this.parents = [];
        /** @param {Note[]} */
        this.children = [];
        /** @param {Attribute[]} */
        this.ownedAttributes = [];

        /** @param {Attribute[]|null} */
        this.__attributeCache = null;
        /** @param {Attribute[]|null} */
        this.inheritableAttributeCache = null;

        /** @param {Attribute[]} */
        this.targetRelations = [];

        this.becca.addNote(this.noteId, this);

        /** @param {Note[]|null} */
        this.ancestorCache = null;
    }

    getParentBranches() {
        return this.parentBranches;
    }

    getBranches() {
        return this.parentBranches;
    }

    getParentNotes() {
        return this.parents;
    }

    getChildNotes() {
        return this.children;
    }

    hasChildren() {
        return this.children && this.children.length > 0;
    }

    getChildBranches() {
        return this.children.map(childNote => this.becca.getBranchFromChildAndParent(childNote.noteId, this.noteId));
    }

    getContent(silentNotFoundError = false) {
        const row = sql.getRow(`SELECT content FROM note_contents WHERE noteId = ?`, [this.noteId]);

        if (!row) {
            if (silentNotFoundError) {
                return undefined;
            }
            else {
                throw new Error("Cannot find note content for noteId=" + this.noteId);
            }
        }

        let content = row.content;

        if (this.isStringNote()) {
            return content === null
                ? ""
                : content.toString("UTF-8");
        }
        else {
            return content;
        }
    }

    /** @returns {*} */
    getJsonContent() {
        const content = this.getContent();

        if (!content || !content.trim()) {
            return null;
        }

        return JSON.parse(content);
    }

    /** @returns {boolean} true if this note is of application/json content type */
    isJson() {
        return this.mime === "application/json";
    }

    /** @returns {boolean} true if this note is JavaScript (code or attachment) */
    isJavaScript() {
        return (this.type === "code" || this.type === "file")
            && (this.mime.startsWith("application/javascript")
                || this.mime === "application/x-javascript"
                || this.mime === "text/javascript");
    }

    /** @returns {boolean} true if this note is HTML */
    isHtml() {
        return ["code", "file", "render"].includes(this.type)
            && this.mime === "text/html";
    }

    /** @returns {boolean} true if the note has string content (not binary) */
    isStringNote() {
        return utils.isStringNote(this.type, this.mime);
    }

    /**
     * @param {string} [type] - (optional) attribute type to filter
     * @param {string} [name] - (optional) attribute name to filter
     * @returns {Attribute[]} all note's attributes, including inherited ones
     */
    getAttributes(type, name) {
        this.__getAttributes([]);

        if (type && name) {
            return this.__attributeCache.filter(attr => attr.type === type && attr.name === name);
        }
        else if (type) {
            return this.__attributeCache.filter(attr => attr.type === type);
        }
        else if (name) {
            return this.__attributeCache.filter(attr => attr.name === name);
        }
        else {
            return this.__attributeCache.slice();
        }
    }

    __getAttributes(path) {
        if (path.includes(this.noteId)) {
            return [];
        }

        if (!this.__attributeCache) {
            const parentAttributes = this.ownedAttributes.slice();
            const newPath = [...path, this.noteId];

            if (this.noteId !== 'root') {
                for (const parentNote of this.parents) {
                    parentAttributes.push(...parentNote.__getInheritableAttributes(newPath));
                }
            }

            const templateAttributes = [];

            for (const ownedAttr of parentAttributes) { // parentAttributes so we process also inherited templates
                if (ownedAttr.type === 'relation' && ownedAttr.name === 'template') {
                    const templateNote = this.becca.notes[ownedAttr.value];

                    if (templateNote) {
                        templateAttributes.push(...templateNote.__getAttributes(newPath));
                    }
                }
            }

            this.__attributeCache = [];

            const addedAttributeIds = new Set();

            for (const attr of parentAttributes.concat(templateAttributes)) {
                if (!addedAttributeIds.has(attr.attributeId)) {
                    addedAttributeIds.add(attr.attributeId);

                    this.__attributeCache.push(attr);
                }
            }

            this.inheritableAttributeCache = [];

            for (const attr of this.__attributeCache) {
                if (attr.isInheritable) {
                    this.inheritableAttributeCache.push(attr);
                }
            }
        }

        return this.__attributeCache;
    }

    /** @return {Attribute[]} */
    __getInheritableAttributes(path) {
        if (path.includes(this.noteId)) {
            return [];
        }

        if (!this.inheritableAttributeCache) {
            this.__getAttributes(path); // will refresh also this.inheritableAttributeCache
        }

        return this.inheritableAttributeCache;
    }

    hasAttribute(type, name) {
        return !!this.getAttributes().find(attr => attr.type === type && attr.name === name);
    }

    getAttributeCaseInsensitive(type, name, value) {
        name = name.toLowerCase();
        value = value ? value.toLowerCase() : null;

        return this.getAttributes().find(
            attr => attr.type === type
            && attr.name.toLowerCase() === name
            && (!value || attr.value.toLowerCase() === value));
    }

    getRelationTarget(name) {
        const relation = this.getAttributes().find(attr => attr.type === 'relation' && attr.name === name);

        return relation ? relation.targetNote : null;
    }

    /**
     * @param {string} name - label name
     * @returns {boolean} true if label exists (including inherited)
     */
    hasLabel(name) { return this.hasAttribute(LABEL, name); }

    /**
     * @param {string} name - label name
     * @returns {boolean} true if label exists (excluding inherited)
     */
    hasOwnedLabel(name) { return this.hasOwnedAttribute(LABEL, name); }

    /**
     * @param {string} name - relation name
     * @returns {boolean} true if relation exists (including inherited)
     */
    hasRelation(name) { return this.hasAttribute(RELATION, name); }

    /**
     * @param {string} name - relation name
     * @returns {boolean} true if relation exists (excluding inherited)
     */
    hasOwnedRelation(name) { return this.hasOwnedAttribute(RELATION, name); }

    /**
     * @param {string} name - label name
     * @returns {Attribute|null} label if it exists, null otherwise
     */
    getLabel(name) { return this.getAttribute(LABEL, name); }

    /**
     * @param {string} name - label name
     * @returns {Attribute|null} label if it exists, null otherwise
     */
    getOwnedLabel(name) { return this.getOwnedAttribute(LABEL, name); }

    /**
     * @param {string} name - relation name
     * @returns {Attribute|null} relation if it exists, null otherwise
     */
    getRelation(name) { return this.getAttribute(RELATION, name); }

    /**
     * @param {string} name - relation name
     * @returns {Attribute|null} relation if it exists, null otherwise
     */
    getOwnedRelation(name) { return this.getOwnedAttribute(RELATION, name); }

    /**
     * @param {string} name - label name
     * @returns {string|null} label value if label exists, null otherwise
     */
    getLabelValue(name) { return this.getAttributeValue(LABEL, name); }

    /**
     * @param {string} name - label name
     * @returns {string|null} label value if label exists, null otherwise
     */
    getOwnedLabelValue(name) { return this.getOwnedAttributeValue(LABEL, name); }

    /**
     * @param {string} name - relation name
     * @returns {string|null} relation value if relation exists, null otherwise
     */
    getRelationValue(name) { return this.getAttributeValue(RELATION, name); }

    /**
     * @param {string} name - relation name
     * @returns {string|null} relation value if relation exists, null otherwise
     */
    getOwnedRelationValue(name) { return this.getOwnedAttributeValue(RELATION, name); }

    /**
     * @param {string} type - attribute type (label, relation, etc.)
     * @param {string} name - attribute name
     * @returns {boolean} true if note has an attribute with given type and name (excluding inherited)
     */
    hasOwnedAttribute(type, name) {
        return !!this.getOwnedAttribute(type, name);
    }

    /**
     * @param {string} type - attribute type (label, relation, etc.)
     * @param {string} name - attribute name
     * @returns {Attribute} attribute of given type and name. If there's more such attributes, first is  returned. Returns null if there's no such attribute belonging to this note.
     */
    getAttribute(type, name) {
        const attributes = this.getAttributes();

        return attributes.find(attr => attr.type === type && attr.name === name);
    }

    /**
     * @param {string} type - attribute type (label, relation, etc.)
     * @param {string} name - attribute name
     * @returns {string|null} attribute value of given type and name or null if no such attribute exists.
     */
    getAttributeValue(type, name) {
        const attr = this.getAttribute(type, name);

        return attr ? attr.value : null;
    }

    /**
     * @param {string} type - attribute type (label, relation, etc.)
     * @param {string} name - attribute name
     * @returns {string|null} attribute value of given type and name or null if no such attribute exists.
     */
    getOwnedAttributeValue(type, name) {
        const attr = this.getOwnedAttribute(type, name);

        return attr ? attr.value : null;
    }

    /**
     * @param {string} [name] - label name to filter
     * @returns {Attribute[]} all note's labels (attributes with type label), including inherited ones
     */
    getLabels(name) {
        return this.getAttributes(LABEL, name);
    }

    /**
     * @param {string} [name] - label name to filter
     * @returns {string[]} all note's label values, including inherited ones
     */
    getLabelValues(name) {
        return this.getLabels(name).map(l => l.value);
    }

    /**
     * @param {string} [name] - label name to filter
     * @returns {Attribute[]} all note's labels (attributes with type label), excluding inherited ones
     */
    getOwnedLabels(name) {
        return this.getOwnedAttributes(LABEL, name);
    }

    /**
     * @param {string} [name] - label name to filter
     * @returns {string[]} all note's label values, excluding inherited ones
     */
    getOwnedLabelValues(name) {
        return this.getOwnedAttributes(LABEL, name).map(l => l.value);
    }

    /**
     * @param {string} [name] - relation name to filter
     * @returns {Attribute[]} all note's relations (attributes with type relation), including inherited ones
     */
    getRelations(name) {
        return this.getAttributes(RELATION, name);
    }

    /**
     * @param {string} [name] - relation name to filter
     * @returns {Attribute[]} all note's relations (attributes with type relation), excluding inherited ones
     */
    getOwnedRelations(name) {
        return this.getOwnedAttributes(RELATION, name);
    }

    /**
     * @param {string} [type] - (optional) attribute type to filter
     * @param {string} [name] - (optional) attribute name to filter
     * @returns {Attribute[]} note's "owned" attributes - excluding inherited ones
     */
    getOwnedAttributes(type, name) {
        // it's a common mistake to include # or ~ into attribute name
        if (name && ["#", "~"].includes(name[0])) {
            name = name.substr(1);
        }

        if (type && name) {
            return this.ownedAttributes.filter(attr => attr.type === type && attr.name === name);
        }
        else if (type) {
            return this.ownedAttributes.filter(attr => attr.type === type);
        }
        else if (name) {
            return this.ownedAttributes.filter(attr => attr.name === name);
        }
        else {
            return this.ownedAttributes.slice();
        }
    }

    /**
     * @returns {Attribute} attribute belonging to this specific note (excludes inherited attributes)
     *
     * This method can be significantly faster than the getAttribute()
     */
    getOwnedAttribute(type, name) {
        const attrs = this.getOwnedAttributes(type, name);

        return attrs.length > 0 ? attrs[0] : null;
    }

    get isArchived() {
        return this.hasAttribute('label', 'archived');
    }

    hasInheritableOwnedArchivedLabel() {
        return !!this.ownedAttributes.find(attr => attr.type === 'label' && attr.name === 'archived' && attr.isInheritable);
    }

    // will sort the parents so that non-search & non-archived are first and archived at the end
    // this is done so that non-search & non-archived paths are always explored as first when looking for note path
    resortParents() {
        this.parentBranches.sort((a, b) =>
            a.branchId.startsWith('virt-')
            || a.parentNote.hasInheritableOwnedArchivedLabel() ? 1 : -1);

        this.parents = this.parentBranches.map(branch => branch.parentNote);
    }

    isTemplate() {
        return !!this.targetRelations.find(rel => rel.name === 'template');
    }

    /** @return {Note[]} */
    getSubtreeNotesIncludingTemplated() {
        const arr = [[this]];

        for (const childNote of this.children) {
            arr.push(childNote.getSubtreeNotesIncludingTemplated());
        }

        for (const targetRelation of this.targetRelations) {
            if (targetRelation.name === 'template') {
                const note = targetRelation.note;

                if (note) {
                    arr.push(note.getSubtreeNotesIncludingTemplated());
                }
            }
        }

        return arr.flat();
    }

    /** @return {Note[]} */
    getSubtreeNotes(includeArchived = true) {
        const noteSet = new Set();

        function addSubtreeNotesInner(note) {
            if (!includeArchived && note.isArchived) {
                return;
            }

            noteSet.add(note);

            for (const childNote of note.children) {
                addSubtreeNotesInner(childNote);
            }
        }

        addSubtreeNotesInner(this);

        return Array.from(noteSet);
    }

    /** @return {String[]} */
    getSubtreeNoteIds() {
        return this.getSubtreeNotes().map(note => note.noteId);
    }

    getDescendantNoteIds() {
        return this.getSubtreeNoteIds();
    }

    getAncestors() {
        if (!this.ancestorCache) {
            const noteIds = new Set();
            this.ancestorCache = [];

            for (const parent of this.parents) {
                if (!noteIds.has(parent.noteId)) {
                    this.ancestorCache.push(parent);
                    noteIds.add(parent.noteId);
                }

                for (const ancestorNote of parent.getAncestors()) {
                    if (!noteIds.has(ancestorNote.noteId)) {
                        this.ancestorCache.push(ancestorNote);
                        noteIds.add(ancestorNote.noteId);
                    }
                }
            }
        }

        return this.ancestorCache;
    }

    getTargetRelations() {
        return this.targetRelations;
    }

    /** @return {Note[]} - returns only notes which are templated, does not include their subtrees
     *                     in effect returns notes which are influenced by note's non-inheritable attributes */
    getTemplatedNotes() {
        const arr = [this];

        for (const targetRelation of this.targetRelations) {
            if (targetRelation.name === 'template') {
                const note = targetRelation.note;

                if (note) {
                    arr.push(note);
                }
            }
        }

        return arr;
    }

    /**
     * @param ancestorNoteId
     * @return {boolean} - true if ancestorNoteId occurs in at least one of the note's paths
     */
    isDescendantOfNote(ancestorNoteId) {
        const notePaths = this.getAllNotePaths();

        return notePaths.some(path => path.includes(ancestorNoteId));
    }
}

module.exports = Note;