import LocationRepo, {
    LocationByTagResult,
    LocationElementQueryResult,
    LocationQueryResult
} from "../repositories/location.repository.js";
import System from "../System.js";
import {getUserEncryptionKey} from "../keyManager.js";

export interface SubElement {
    id: string;
    name: string;
    description: string;
}

export interface Element {
    id: string;
    name: string;
    description: string;
    subElements: SubElement[];
}

export interface LocationProps {
    id: string;
    name: string;
    elements: Element[];
}

export default class Location {
    /**
     * Récupère toutes les locations pour un utilisateur et un livre donnés.
     * @param {string} userId - L'ID de l'utilisateur.
     * @param {string} bookId - L'ID du livre.
     * @returns {LocationProps[]} - Un tableau de propriétés de location.
     * @throws {Error} - Lance une erreur si une exception se produit lors de la récupération des locations.
     */
    static getAllLocations(userId: string, bookId: string, lang: 'fr' | 'en' = 'fr'): LocationProps[] {
        const locations: LocationQueryResult[] = LocationRepo.getLocation(userId, bookId, lang);
        if (!locations || locations.length === 0) return [];
        const userKey: string = getUserEncryptionKey(userId);

        const locationArray: LocationProps[] = [];

        for (const record of locations) {
            let location = locationArray.find(loc => loc.id === record.loc_id);

            if (!location) {
                const decryptedName: string = System.decryptDataWithUserKey(record.loc_name, userKey);
                location = {
                    id: record.loc_id,
                    name: decryptedName,
                    elements: []
                };
                locationArray.push(location);
            }

            if (record.element_id) {
                let element = location.elements.find(elem => elem.id === record.element_id);
                if (!element) {
                    const decryptedName: string = System.decryptDataWithUserKey(record.element_name, userKey);
                    const decryptedDesc: string = record.element_description ? System.decryptDataWithUserKey(record.element_description, userKey) : '';

                    element = {
                        id: record.element_id,
                        name: decryptedName,
                        description: decryptedDesc,
                        subElements: []
                    };
                    location.elements.push(element);
                }

                if (record.sub_element_id) {
                    const subElementExists = element.subElements.some(sub => sub.id === record.sub_element_id);

                    if (!subElementExists) {
                        const decryptedName: string = System.decryptDataWithUserKey(record.sub_elem_name, userKey);
                        const decryptedDesc: string = record.sub_elem_description ? System.decryptDataWithUserKey(record.sub_elem_description, userKey) : '';


                        element.subElements.push({
                            id: record.sub_element_id,
                            name: decryptedName,
                            description: decryptedDesc
                        });
                    }
                }
            }
        }
        return locationArray;
    }

    static addLocationSection(userId: string, locationName: string, bookId: string, lang: 'fr' | 'en' = 'fr', existingLocationId?: string): string {
        const userKey: string = getUserEncryptionKey(userId);
        const originalName: string = System.hashElement(locationName);
        const encryptedName: string = System.encryptDataWithUserKey(locationName, userKey);
        const locationId: string = existingLocationId || System.createUniqueId();
        return LocationRepo.insertLocation(userId, locationId, bookId, encryptedName, originalName, lang);
    }

    static addLocationElement(userId: string, locationId: string, elementName: string, lang: 'fr' | 'en' = 'fr', existingElementId?: string) {
        const userKey: string = getUserEncryptionKey(userId);
        const originalName: string = System.hashElement(elementName);
        const encryptedName: string = System.encryptDataWithUserKey(elementName, userKey);
        const elementId: string = existingElementId || System.createUniqueId();
        return LocationRepo.insertLocationElement(userId, elementId, locationId, encryptedName, originalName, lang)
    }

    static addLocationSubElement(userId: string, elementId: string, subElementName: string, lang: 'fr' | 'en' = 'fr', existingSubElementId?: string) {
        const userKey: string = getUserEncryptionKey(userId);
        const originalName: string = System.hashElement(subElementName);
        const encryptedName: string = System.encryptDataWithUserKey(subElementName, userKey);
        const subElementId: string = existingSubElementId || System.createUniqueId();
        return LocationRepo.insertLocationSubElement(userId, subElementId, elementId, encryptedName, originalName, lang)
    }

    static updateLocationSection(userId: string, locations: LocationProps[], lang: 'fr' | 'en' = 'fr') {
        const userKey: string = getUserEncryptionKey(userId);

        for (const location of locations) {
            const originalName: string = System.hashElement(location.name);
            const encryptedName: string = System.encryptDataWithUserKey(location.name, userKey);
            LocationRepo.updateLocationSection(userId, location.id, encryptedName, originalName, System.timeStampInSeconds(),lang)
            for (const element of location.elements) {
                const originalName: string = System.hashElement(element.name);
                const encryptedName: string = System.encryptDataWithUserKey(element.name, userKey);
                const encryptDescription: string = element.description ? System.encryptDataWithUserKey(element.description, userKey) : '';
                LocationRepo.updateLocationElement(userId, element.id, encryptedName, originalName, encryptDescription, System.timeStampInSeconds(), lang)
                for (const subElement of element.subElements) {
                    const originalName: string = System.hashElement(subElement.name);
                    const encryptedName: string = System.encryptDataWithUserKey(subElement.name, userKey);
                    const encryptDescription: string = subElement.description ? System.encryptDataWithUserKey(subElement.description, userKey) : '';
                    LocationRepo.updateLocationSubElement(userId, subElement.id, encryptedName, originalName, encryptDescription,System.timeStampInSeconds(),lang)
                }
            }
        }
        return {
            valid: true,
            message: lang === 'fr' ? 'Les sections ont été mis à jour.' : 'Sections have been updated.'
        }
    }

    static deleteLocationSection(userId: string, locationId: string, lang: 'fr' | 'en' = 'fr') {
        return LocationRepo.deleteLocationSection(userId, locationId, lang);
    }

    static deleteLocationElement(userId: string, elementId: string, lang: 'fr' | 'en' = 'fr') {
        return LocationRepo.deleteLocationElement(userId, elementId, lang);
    }

    static deleteLocationSubElement(userId: string, subElementId: string, lang: 'fr' | 'en' = 'fr') {
        return LocationRepo.deleteLocationSubElement(userId, subElementId, lang);
    }

    static getLocationTags(userId: string, bookId: string, lang: 'fr' | 'en' = 'fr'): SubElement[] {
        const data: LocationElementQueryResult[] = LocationRepo.fetchLocationTags(userId, bookId, lang);
        if (!data || data.length === 0) return [];
        const userKey: string = getUserEncryptionKey(userId);

        const elementCounts = new Map<string, number>();
        data.forEach((record: LocationElementQueryResult): void => {
            elementCounts.set(record.element_id, (elementCounts.get(record.element_id) || 0) + 1);
        });

        const subElements: SubElement[] = [];
        const processedIds = new Set<string>();

        for (const record of data) {
            const elementCount: number = elementCounts.get(record.element_id) || 0;

            if (elementCount > 1 && record.sub_element_id) {
                if (processedIds.has(record.sub_element_id)) continue;

                subElements.push({
                    id: record.sub_element_id,
                    name: System.decryptDataWithUserKey(record.sub_elem_name, userKey),
                    description: record.sub_elem_description ? System.decryptDataWithUserKey(record.sub_elem_description, userKey) : ''
                });
                processedIds.add(record.sub_element_id);
            } else if (elementCount === 1 && !record.sub_element_id) {
                if (processedIds.has(record.element_id)) continue;

                subElements.push({
                    id: record.element_id,
                    name: System.decryptDataWithUserKey(record.element_name, userKey),
                    description: record.element_description ? System.decryptDataWithUserKey(record.element_description, userKey) : ''
                });
                processedIds.add(record.element_id);
            }
        }
        return subElements;
    }

    static getLocationsByTags(userId: string, locations: string[], lang: 'fr' | 'en' = 'fr'): Element[] {
        const locationsTags: LocationByTagResult[] = LocationRepo.fetchLocationsByTags(userId, locations, lang);
        if (!locationsTags || locationsTags.length === 0) return [];
        const userKey: string = getUserEncryptionKey(userId);
        const locationTags: Element[] = [];
        for (const record of locationsTags) {
            let element: Element | undefined = locationTags.find((elem: Element): boolean => elem.name === record.element_name);
            if (!element) {
                const decryptedName: string = System.decryptDataWithUserKey(record.element_name, userKey);
                const decryptedDesc: string = record.element_description ? System.decryptDataWithUserKey(record.element_description, userKey) : '';
                element = {
                    id: '',
                    name: decryptedName,
                    description: decryptedDesc,
                    subElements: []
                };
                locationTags.push(element);
            }
            if (record.sub_elem_name) {
                const subElementExists: boolean = element.subElements.some(sub => sub.name === record.sub_elem_name);
                if (!subElementExists) {
                    const decryptedName: string = System.decryptDataWithUserKey(record.sub_elem_name, userKey);
                    const decryptedDesc: string = record.sub_elem_description ? System.decryptDataWithUserKey(record.sub_elem_description, userKey) : '';
                    element.subElements.push({
                        id: '',
                        name: decryptedName,
                        description: decryptedDesc
                    });
                }
            }
        }
        return locationTags;
    }

    static locationsDescription(locations: Element[]): string {
        return locations.map((location: Element): string => {
            const fields: string[] = [];
            if (location.name) fields.push(`Nom : ${location.name}`);
            if (location.description) fields.push(`Description : ${location.description}`);
            return fields.join('\n');
        }).join('\n\n');
    }
}