/**
 * Class model for Collection Interface
 */

import type { CollectionContentTypes, CollectionInterface, CollectionModelInterface, CollectionPropertiesInterface } from "@/types/collection";

/**
 * Reduce a serialized resource identifier ("provider:service:collection")
 * to its own (last) segment; plain values pass through unchanged
 */
function plainIdentifier(value: string | number | null | undefined): string | number | null {
    if (value === null || value === undefined || value === '') {
        return value ?? null;
    }
    const text = String(value);
    const index = text.lastIndexOf(':');
    return index >= 0 ? text.slice(index + 1) : value;
}

export class CollectionObject implements CollectionModelInterface {

    _data!: CollectionInterface;

    constructor() {
        this._data = {
            '@type': 'documents:collection',
            schema: 1,
            provider: '',
            service: '',
            collection: null,
            identifier: '',
            signature: null,
            created: null,
            modified: null,
            properties: new CollectionPropertiesObject(),
        };
    }

    fromJson(data: CollectionInterface): CollectionObject {
        // the wire format carries full resource identifiers (provider:service:collection);
        // reduce them to plain ids, which is what the stores and UI operate on
        this._data = {
            ...data,
            service: plainIdentifier(data.service) ?? '',
            collection: plainIdentifier(data.collection),
            identifier: plainIdentifier(data.identifier) ?? '',
        };
        if (data.properties) {
            this._data.properties = new CollectionPropertiesObject().fromJson(data.properties as CollectionPropertiesInterface);
        }
        return this;
    }

    toJson(): CollectionInterface {
        const json = { ...this._data };
        if (this._data.properties instanceof CollectionPropertiesObject) {
            json.properties = this._data.properties.toJson();
        }
        return json;
    }

    clone(): CollectionObject {
        const cloned = new CollectionObject();
        cloned._data = { ...this._data };
        cloned._data.properties = this.properties.clone();
        return cloned;
    }

    /** Immutable Properties */

    get schema(): number {
        return this._data.schema;
    }

    get provider(): string {
        return this._data.provider;
    }

    get service(): string | number {
        return this._data.service;
    }

    get collection(): string | number | null {
        return this._data.collection;
    }

    get identifier(): string | number {
        return this._data.identifier;
    }

    get signature(): string | null {
        return this._data.signature || null;
    }

    get created(): Date | null {
        return this._data.created ? new Date(this._data.created) : null;
    }

    get modified(): Date | null {
        return this._data.modified ? new Date(this._data.modified) : null;
    }

    get properties(): CollectionPropertiesObject {
        if (this._data.properties instanceof CollectionPropertiesObject) {
            return this._data.properties;
        }

        if (this._data.properties) {
            const hydrated = new CollectionPropertiesObject().fromJson(this._data.properties as CollectionPropertiesInterface);
            this._data.properties = hydrated;
            return hydrated;
        }

        const defaultProperties = new CollectionPropertiesObject();
        this._data.properties = defaultProperties;
        return defaultProperties;
    }

    set properties(value: CollectionPropertiesObject) {
        if (value instanceof CollectionPropertiesObject) {
            this._data.properties = value as any;
        } else {
            this._data.properties = value;
        }
    }
}

export class CollectionPropertiesObject implements CollectionPropertiesInterface {

    _data!: CollectionPropertiesInterface;

    constructor() {
        this._data = {
            content: [],
            owner: '',
            label: '',
        };
    }

    fromJson(data: CollectionPropertiesInterface): CollectionPropertiesObject {
        this._data = data;
        return this;
    }

    toJson(): CollectionPropertiesInterface {
        return this._data;
    }

    clone(): CollectionPropertiesObject {
        const cloned = new CollectionPropertiesObject();
        cloned._data = { ...this._data };
        return cloned;
    }

    /** Immutable Properties */

    get content(): CollectionContentTypes[] {
        return this._data.content || [];
    }

    /** Mutable Properties */

    get owner(): string {
        return this._data.owner;
    }

    set owner(value: string) {
        this._data.owner = value;
    }

    get label(): string {
        return this._data.label || '';
    }

    set label(value: string) {
        this._data.label = value;
    }
    
}