import server from '../services/server.js';
import Attribute from './attribute.js';
import branches from "../services/branches.js";

const LABEL = 'label';
const LABEL_DEFINITION = 'label-definition';
const RELATION = 'relation';
const RELATION_DEFINITION = 'relation-definition';

/**
 * FIXME: rethink how attributes are cached in Note entities since they are long lived inside the cache.
 * Attribute cache should be limited to "transaction".
 *
 * This note's representation is used in note tree and is kept in TreeCache.
 */
class NoteShort {
    /**
     * @param {TreeCache} treeCache
     * @param {Object.<string, Object>} row
     * @param {Branch[]} branches - all relevant branches, i.e. where this note is either child or parent
     */
    constructor(treeCache, row, branches) {
        this.treeCache = treeCache;
        /** @param {string} */
        this.noteId = row.noteId;
        /** @param {string} */
        this.title = row.title;
        /** @param {boolean} */
        this.isProtected = row.isProtected;
        /** @param {string} one of 'text', 'code', 'file' or 'render' */
        this.type = row.type;
        /** @param {string} content-type, e.g. "application/json" */
        this.mime = row.mime;
        /** @param {boolean} */
        this.archived = row.archived;
        /** @param {string} */
        this.cssClass = row.cssClass;

        /** @type {string[]} */
        this.parents = [];
        /** @type {string[]} */
        this.children = [];

        /** @type {Object.<string, string>} */
        this.parentToBranch = {};

        /** @type {Object.<string, string>} */
        this.childToBranch = {};

        for (const branch of branches) {
            if (this.noteId === branch.noteId) {
                this.parents.push(branch.parentNoteId);
                this.parentToBranch[branch.parentNoteId] = branch.branchId;
            }
            else if (this.noteId === branch.parentNoteId) {
                this.children.push(branch.noteId);
                this.childToBranch[branch.noteId] = branch.branchId;
            }
            else {
                throw new Error(`Unknown branch ${branch.branchId} for note ${this.noteId}`);
            }
        }
    }

    addParent(parentNoteId, branchId) {
        if (!this.parents.includes(parentNoteId)) {
            this.parents.push(parentNoteId);
        }

        this.parentToBranch[parentNoteId] = branchId;
    }

    addChild(childNoteId, branchId) {
        if (!this.children.includes(childNoteId)) {
            this.children.push(childNoteId);
        }

        this.childToBranch[childNoteId] = branchId;

        const branchIdPos = {};

        for (const branchId of Object.values(this.childToBranch)) {
            branchIdPos[branchId] = this.treeCache.branches[branchId].notePosition;
        }

        this.children.sort((a, b) => branchIdPos[this.childToBranch[a]] < branchIdPos[this.childToBranch[b]] ? -1 : 1);
    }

    /** @returns {boolean} */
    isJson() {
        return this.mime === "application/json";
    }

    async getContent() {
        // we're not caching content since these objects are in treeCache and as such pretty long lived
        const note = await server.get("notes/" + this.noteId);

        return note.content;
    }

    async getJsonContent() {
        const content = await this.getContent();

        try {
            return JSON.parse(content);
        }
        catch (e) {
            console.log(`Cannot parse content of note ${this.noteId}: `, e.message);

            return null;
        }
    }

    /** @returns {Promise<Branch[]>} */
    async getBranches() {
        const branchIds = Object.values(this.parentToBranch);

        return this.treeCache.getBranches(branchIds);
    }

    /** @returns {boolean} */
    hasChildren() {
        return this.children.length > 0;
    }

    /** @returns {Promise<Branch[]>} */
    async getChildBranches() {
        const branchIds = Object.values(this.childToBranch);

        return this.treeCache.getBranches(branchIds);
    }

    /** @returns {string[]} */
    getParentNoteIds() {
        return this.parents;
    }

    /** @returns {Promise<NoteShort[]>} */
    async getParentNotes() {
        return await this.treeCache.getNotes(this.parents);
    }

    /** @returns {string[]} */
    getChildNoteIds() {
        return this.children;
    }

    /** @returns {Promise<NoteShort[]>} */
    async getChildNotes() {
        return await this.treeCache.getNotes(this.children);
    }

    /**
     * @param {string} [name] - attribute name to filter
     * @returns {Promise<Attribute[]>}
     */
    async getAttributes(name) {
        if (!this.attributeCache) {
            this.attributeCache = (await server.get('notes/' + this.noteId + '/attributes'))
                .map(attrRow => new Attribute(this.treeCache, attrRow));
        }

        if (name) {
            return this.attributeCache.filter(attr => attr.name === name);
        }
        else {
            return this.attributeCache;
        }
    }

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

    /**
     * @param {string} [name] - label name to filter
     * @returns {Promise<Attribute[]>} all note's label definitions, including inherited ones
     */
    async getLabelDefinitions(name) {
        return (await this.getAttributes(name)).filter(attr => attr.type === LABEL_DEFINITION);
    }

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

    /**
     * @param {string} [name] - relation name to filter
     * @returns {Promise<Attribute[]>} all note's relation definitions including inherited ones
     */
    async getRelationDefinitions(name) {
        return (await this.getAttributes(name)).filter(attr => attr.type === RELATION_DEFINITION);
    }

    /**
     * @param {string} type - attribute type (label, relation, etc.)
     * @param {string} name - attribute name
     * @returns {Promise<boolean>} true if note has an attribute with given type and name (including inherited)
     */
    async hasAttribute(type, name) {
        return !!await this.getAttribute(type, name);
    }

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

        return attr ? attr.value : null;
    }

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

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

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

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

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

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

    /**
     * @param {string} name
     * @returns {Promise<NoteShort>|null} target note of the relation or null (if target is empty or note was not found)
     */
    async getRelationTarget(name) {
        const targets = await this.getRelationTargets(name);

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

    /**
     * @param {string} [name] - relation name to filter
     * @returns {Promise<NoteShort[]>}
     */
    async getRelationTargets(name) {
        const relations = await this.getRelations(name);
        const targets = [];

        for (const relation of relations) {
            targets.push(await this.treeCache.getNote(relation.value));
        }

        return targets;
    }

    /**
     * Clear note's attributes cache to force fresh reload for next attribute request.
     * Cache is note instance scoped.
     */
    invalidateAttributeCache() {
        this.attributeCache = null;
    }

    /**
     * Get relations which target this note
     *
     * @returns {Promise<Attribute[]>}
     */
    async getTargetRelations() {
        return (await server.get('notes/' + this.noteId + '/target-relations'))
            .map(attrRow => new Attribute(this.treeCache, attrRow));
    }

    get toString() {
        return `Note(noteId=${this.noteId}, title=${this.title})`;
    }

    get dto() {
        const dto = Object.assign({}, this);
        delete dto.treeCache;
        delete dto.archived;
        delete dto.attributeCache;

        return dto;
    }
}

export default NoteShort;