'use server';

import { z } from 'zod';
import { getDbClient } from '../dbClient';
import { BillingLocation, YearMonth } from '../db-types';
import { ObjectId } from 'mongodb';
import { withUser } from '@/app/lib/auth';
import { AuthenticatedUser } from '../types/next-auth';
import { gotoHome } from './navigationActions';
import { unstable_noStore as noStore } from 'next/cache';
import { IntlTemplateFn } from '@/app/i18n';
import { getTranslations } from "next-intl/server";

export type State = {
    errors?: {
        locationName?: string[];
        locationNotes?: string[],
    };
    message?:string | null;
};

/**
 * Schema for validating location form fields
 * @description this is defined as factory function so that it can be used with the next-intl library
*/
const FormSchema = (t:IntlTemplateFn) => z.object({
    _id: z.string(),
    locationName: z.coerce.string().min(1, t("location-name-required")),
    locationNotes: z.string(),
  })
  // dont include the _id field in the response
  .omit({ _id: true });

/**
 * Server-side action which adds or updates a bill
 * @param locationId location of the bill
 * @param prevState previous state of the form
 * @param formData form data
 * @returns 
 */
export const updateOrAddLocation = withUser(async (user:AuthenticatedUser, locationId: string | undefined, yearMonth: YearMonth | undefined, prevState:State, formData: FormData) => {

    noStore();

    const t = await getTranslations("location-edit-form.validation");

    const validatedFields = FormSchema(t).safeParse({
        locationName: formData.get('locationName'),
        locationNotes: formData.get('locationNotes'),
    });

    // If form validation fails, return errors early. Otherwise, continue...
    if(!validatedFields.success) {
        return({
            errors: validatedFields.error.flatten().fieldErrors,
            message: "Missing Fields",
        });
    }

    const {
        locationName,
        locationNotes,
    } = validatedFields.data;

    // update the bill in the mongodb
    const dbClient = await getDbClient();

    const { id: userId, email: userEmail } = user;

    if(locationId) {
        await dbClient.collection<BillingLocation>("lokacije").updateOne(
            {
                _id: locationId, // find a location with the given locationID
                userId // make sure the location belongs to the user
            },
            {
                $set: {
                    name: locationName,
                    notes: locationNotes,
                }
            });
    } else if(yearMonth) {
        await dbClient.collection<BillingLocation>("lokacije").insertOne({
            _id: (new ObjectId()).toHexString(),
            userId,
            userEmail,
            name: locationName,
            notes: locationNotes,
            yearMonth: yearMonth,
            bills: [],
        });
    }

    if(yearMonth) await gotoHome(yearMonth);

    return {
        message: null,
        errors: undefined,
    };
});


export const fetchAllLocations = withUser(async (user:AuthenticatedUser, year:number) => {

    noStore();

    const dbClient = await getDbClient();

    const { id: userId } = user;

    // fetch all locations for the given year
    const locations = await dbClient.collection<BillingLocation>("lokacije")
        .aggregate([
            {
                $match: {
                    userId,
                    "yearMonth.year": year,
                },
            },
            {
                $addFields: {
                    bills: {
                        $map: {
                            input: "$bills",
                            as: "bill",
                            in: {
                                _id: "$$bill._id",
                                name: "$$bill.name",
                                paid: "$$bill.paid",
                                payedAmount: "$$bill.payedAmount",
                                hasAttachment: { $ne: ["$$bill.attachment", null] },
                            },
                        },
                    },
                },
            },
            {
                $project: {
                    "_id": 1,
                    // "userId": 0,
                    // "userEmail": 0,
                    "name": 1,
                    // "notes": 0,
                    // "yearMonth": 1,
                    "yearMonth.year": 1,
                    "yearMonth.month": 1,
                    // "bills": 1,
                    "bills._id": 1,
                    "bills.name": 1,
                    "bills.paid": 1,
                    "bills.payedAmount": 1,
                    "bills.hasAttachment": 1,
                    // "bills.attachment": 0,
                    // "bills.notes": 0,
                    // "bills.barcodeImage": 1,
                },
            },
            {
                $sort: {
                    "yearMonth.year": -1,
                    "yearMonth.month": -1,
                    name: 1,
                },
            },
        ])
        .toArray();

    return(locations)
})

/*
ova metoda je zamijenjena sa jednostavnijom `fetchLocationById`, koja brže radi jer ne provjerava korisnika

export const fetchLocationByUserAndId = withUser(async (user:AuthenticatedUser, locationID:string) => {

    noStore();

    const dbClient = await getDbClient();

    const { id: userId } = user;

    // find a location with the given locationID
    const billLocation = await dbClient.collection<BillingLocation>("lokacije")
        .findOne(
            { _id: locationID, userId },
            {
                projection: {
                    // don't include the attachment binary data in the response
                    "bills.attachment.fileContentsBase64": 0,
                },
            }
        );

    if(!billLocation) {
        console.log(`Location ${locationID} not found`);
        return(null);
    }

    return(billLocation);
});
*/

export const fetchLocationById = async (locationID:string) => {

    noStore();

    const dbClient = await getDbClient();

    // find a location with the given locationID
    const billLocation = await dbClient.collection<BillingLocation>("lokacije")
        .findOne(
            { _id: locationID },
            {
                projection: {
                    // don't include the attachment binary data in the response
                    "bills.attachment.fileContentsBase64": 0,
                },
            }
        );

    if(!billLocation) {
        console.log(`Location ${locationID} not found`);
        return(null);
    }

    return(billLocation);
};

export const deleteLocationById = withUser(async (user:AuthenticatedUser, locationID:string, yearMonth:YearMonth) => {

    noStore();

    const dbClient = await getDbClient();

    const { id: userId } = user;

    // find a location with the given locationID
    const post = await dbClient.collection<BillingLocation>("lokacije").deleteOne({ _id: locationID, userId });
    
    await gotoHome(yearMonth)
})