import ApiRequestService from "./apiRequestService";
import {AssociativeArray} from "./data";
import {Repository, useRepo} from "pinia-orm";
import UrlBuilder from "~/services/utils/urlBuilder";
import ModelNormalizer from "./serializer/normalizer/modelNormalizer";
import HydraDenormalizer from "./serializer/denormalizer/hydraDenormalizer";
import ApiModel from "~/models/ApiModel";
import {useProfileAccessStore} from "~/store/profile/access";
import ApiResource from "~/models/ApiResource";
import {MyProfile} from "~/models/Access/MyProfile";
import { v4 as uuid4 } from 'uuid';

/**
 * Entity manager: make operations on the models defined with the Pinia-Orm library
 *
 * @see https://pinia-orm.codedredd.de/
 */
class EntityManager {
    private initialState: Map<string, Map<number, ApiResource>>;
    private apiRequestService: ApiRequestService;

    public constructor(apiRequestService: ApiRequestService) {
        this.apiRequestService = apiRequestService
        this.initialState = new Map<string, Map<number, ApiResource>>()
    }

    /**
     * Return the repository for the model
     *
     * @param model
     */
    public getRepository(model: typeof ApiResource): Repository<ApiResource> {
        return useRepo(model)
    }

    /**
     * Fetch one Entity / ApiResource by its id, save it to the store and returns it
     *
     * @param model  Model of the object to fetch
     * @param id   Id of the object to fetch
     * @param forceRefresh  Force a new get request to the api ;
     *                      current object in store will be overwritten if it exists
     */
    public async fetch(model: typeof ApiResource, id: number, forceRefresh: boolean = false): Promise<ApiResource> {

        const repository = this.getRepository(model)

        // If the entity is already in the store and forceRefresh is false, return the object in store
        if (!forceRefresh) {
            const item = repository.find(id)
            console.log(model, id, ' => item : ', item)
            if (item && typeof item !== 'undefined') {
                return item
            }
        }

        // Else, get the object from the API
        const url = UrlBuilder.join('api', model.entity, String(id))

        const response = await this.apiRequestService.get(url)

        // deserialize the response
        const attributes = HydraDenormalizer.denormalize(response).data as object

        return this.new(model, attributes)
    }

    public findBy(model: typeof ApiResource, query: AssociativeArray) {
        // TODO: implement
    }

    public fetchAll(model: typeof ApiResource) {
        // TODO: implement
    }

    /**
     * Persist the entity as it is in the store into the data source via the API
     *
     * @param model
     * @param entity
     */
    public async persist(model: typeof ApiModel, entity: ApiModel) {

        const repository = this.getRepository(model)

        let url = UrlBuilder.join('api', model.entity)
        let response

        const data = ModelNormalizer.normalize(entity)

        if (!entity.isNew()) {
            url = UrlBuilder.join(url, String(entity.id))
            response = await this.apiRequestService.put(url, data)
        } else {
            response = await this.apiRequestService.post(url, data)
        }

        const attributes = await HydraDenormalizer.denormalize(response)
        const returnedEntity = this.new(model, attributes)

        this.storeInitialState(returnedEntity)

        // Save data into the store
        repository.save(returnedEntity)

        if (['accesses', 'organizations', 'parameters', 'subdomains'].includes(model.entity)) {
            await this.refreshProfile()
        }

        return returnedEntity
    }

    /**
     * Delete the entity from the datasource via the API
     *
     * @param model
     * @param id
     */
    public async delete(model: typeof ApiModel, id: number) {
        const repository = this.getRepository(model)
        const entity = repository.find(id) as ApiModel

        if (!entity || typeof entity === 'undefined') {
            throw new Error(model + ' ' + id + ' does not exists in store')
        }

        // If object has been persisted to the datasource, send a delete request
        if (!entity.isNew()) {
            const url = UrlBuilder.join('api', model.entity, String(id))
            await this.apiRequestService.delete(url)
        }

        // update the store
        repository.destroy(id)
    }

    /**
     * Create a new instance of the given model
     *
     * @param model
     * @param properties
     */
    public new(model: typeof ApiResource, properties: object = {}) {
        const repository = this.getRepository(model)

        const entity = repository.make(properties)

        if (!entity.id) {
            // Object has no id yet, we give him a temporary one
            entity.id = 'tmp' + uuid4()
        }
        repository.save(entity)

        this.storeInitialState(entity)

        return entity
    }

    /**
     * Reset the entity to its initial state (i.e. the state it had when it was fetched from the API)
     *
     * @param entity
     */
    public reset(entity: ApiResource) {
        const state = this.getInitialStateOf(entity)
        if (state === null) {
            console.log('no initial state recorded for this object - abort', entity)
            return
        }

        const repository = this.getRepository(EntityManager.getModelOf(entity))
        repository.save(state)
    }

    /**
     * Re-fetch the user profile and update the store
     */
    public async refreshProfile() {
        const response = await this.apiRequestService.get('api/my_profile')

        // deserialize the response
        const attributes = await HydraDenormalizer.denormalize(response).data

        const profile = this.new(MyProfile, attributes)

        const profileAccessStore = useProfileAccessStore()
        profileAccessStore.setProfile(profile)
    }

    /**
     * Delete all records in the repository of the model
     *
     * @param model
     */
    public async flush(model: typeof ApiModel) {
        const repository = this.getRepository(model)
        repository.flush()
    }

    private storeInitialState(entity: ApiResource) {
        const model = EntityManager.getModelOf(entity)

        if (!this.initialState.has(model.entity)) {
            this.initialState.set(model.entity, new Map())
        }

        // @ts-ignore
        this.initialState.get(model.entity).set(entity.id, useCloneDeep(entity))

        // TODO: voir si structuredClone est compatible avec les navigateurs supportés, et si ça vaut le coup
        //       de l'utiliser à la place du clonedeep de lodash
        //        >> https://developer.mozilla.org/en-US/docs/Web/API/structuredClone
    }

    private getInitialStateOf(entity: ApiResource): ApiResource | null {
        const model = EntityManager.getModelOf(entity)

        // @ts-ignore
        if (!this.initialState.has(model.entity) || !this.initialState.get(model.entity).has(entity.id)) {
            return null
        }

        // @ts-ignore
        return this.initialState.get(model.entity).get(entity.id)
    }

    /**
     * Return the model (=class) of the given entity
     *
     * @param entity
     * @private
     */
    private static getModelOf(entity: ApiResource): typeof ApiResource {
        return Object.getPrototypeOf(entity)
    }
}

export default EntityManager