// /**
//  * @swagger
//  * /api/endpoint/createmywatchedcases_api:
//  *   post:
//  *     tags: [Portal,Case]
//  *     summary: Phase 2
//  *     description: Create my watched cases
//  *     responses:
//  *       200:
//  *         description: Success
//  */

import axios from "axios";
import { consoleLogger } from "../../../actions/core/logger";
import { getToken } from "../../../actions/core/token";
import { hashAPIPath } from "../../../actions/core/hash";
import { respondError, respondSuccess } from "../middleware/apiResponse";
import { relayGetData } from "../middleware/relayForwarding";
import { getServerSession } from "next-auth/next";
import { authOptions } from "../auth/[...nextauth]";
import { azureHeaders } from "../../../actions/core/headers";
import { escapeODataString } from "../../../actions/core/guards";

const WEBAPI_URL =
    process.env.RELAY_ROOT ||
    "https://dev-pedw-ns.servicebus.windows.net/dev-pedw-hc/";

const GUID_PATTERN =
    /^[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$/i;

const recordExists = async (incidentId, contactId, accessToken) => {
    const filter = `$filter=pinswg_WatchedCase/incidentid eq ${incidentId} and pinswg_Contact/contactid eq ${contactId}`;
    const queryUrl =
        `pinswg_watchlists?${filter}` +
        "&$select=pinswg_watchlistid,_pinswg_contact_value,_pinswg_watchedcase_value,pinswg_representationsubmitted";

    const response = await relayGetData({
        queryUrl,
        accessToken,
        requestOptionsBuilder: (token) => ({
            headers: {
                Authorization: "Bearer " + token,
                Accept: "application/json"
            }
        })
    });

    const records = response?.data?.value;

    if (!Array.isArray(records)) {
        return {
            status: "invalid",
            records: []
        };
    }

    return {
        status: "found",
        records
    };
};

export default async function ApiProxy(req, res) {
    if (req.method !== "POST") {
        return respondError(res, {
            status: 405,
            code: "METHOD_NOT_ALLOWED",
            message: "Only POST is supported"
        });
    }

    const session = await getServerSession(req, res, authOptions(req, res));
    const authenticatedEmail = session?.user?.email;

    if (
        typeof authenticatedEmail !== "string" ||
        authenticatedEmail.trim().length === 0
    ) {
        return respondError(res, {
            status: 401,
            code: "UNAUTHENTICATED",
            message: "Authentication required"
        });
    }

    const data = req.body;
    const watchedCaseBind = data?.["pinswg_WatchedCase@odata.bind"];
    const contactBind = data?.["pinswg_Contact@odata.bind"];

    if (
        typeof watchedCaseBind !== "string" ||
        watchedCaseBind.length === 0 ||
        typeof contactBind !== "string" ||
        contactBind.length === 0
    ) {
        return respondError(res, {
            status: 400,
            code: "WATCHED_CASE_BINDINGS_REQUIRED",
            message:
                "pinswg_WatchedCase and pinswg_Contact bindings are required"
        });
    }

    const watchedCaseMatch = watchedCaseBind.match(
        /^\/incidents\(([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})\)$/i
    );

    const contactMatch = contactBind.match(
        /^\/contacts\(([0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12})\)$/i
    );

    if (!watchedCaseMatch || !contactMatch) {
        return respondError(res, {
            status: 400,
            code: "INVALID_BINDING_FORMAT",
            message: "Invalid odata.bind format for watched case or contact"
        });
    }

    try {
        const token = await getToken();
        const incidentId = watchedCaseMatch[1];
        const contactId = contactMatch[1];

        const escapedEmail = escapeODataString(authenticatedEmail);

        const contactQueryUrl =
            "contacts?$filter=emailaddress1 eq '" +
            escapedEmail +
            "' and statuscode eq 1&$select=contactid";

        const contactResponse = await relayGetData({
            queryUrl: contactQueryUrl,
            accessToken: token.access_token,
            requestOptionsBuilder: (accessToken) => azureHeaders(accessToken)
        });

        const contacts = contactResponse?.data?.value;

        if (
            !Array.isArray(contacts) ||
            contacts.length !== 1 ||
            typeof contacts[0]?.contactid !== "string" ||
            !GUID_PATTERN.test(contacts[0].contactid.trim())
        ) {
            return respondError(res, {
                status: 403,
                code: "CONTACT_IDENTITY_NOT_RESOLVED",
                message: "Request not permitted"
            });
        }

        if (
            contactId.trim().toLowerCase() !==
            contacts[0].contactid.trim().toLowerCase()
        ) {
            return respondError(res, {
                status: 403,
                code: "CONTACT_OWNERSHIP_MISMATCH",
                message: "Request not permitted"
            });
        }

        const lookup = await recordExists(
            incidentId,
            contactId,
            token.access_token
        );

        if (lookup.status === "invalid") {
            return respondError(res, {
                status: 500,
                code: "WATCHLIST_LOOKUP_FAILED",
                message: "Unable to verify existing watched-case records"
            });
        }

        const records = lookup.records;

        const isRepresentationSubmission =
            data?.pinswg_representationsubmitted != null;

        // Validate every returned record before considering it for an update.
        const validRecords = records.every((record) => {
            const recordID = record?.pinswg_watchlistid;
            const recordContactID = record?._pinswg_contact_value;
            const recordCaseID = record?._pinswg_watchedcase_value;

            return (
                typeof recordID === "string" &&
                GUID_PATTERN.test(recordID) &&
                typeof recordContactID === "string" &&
                GUID_PATTERN.test(recordContactID) &&
                typeof recordCaseID === "string" &&
                GUID_PATTERN.test(recordCaseID) &&
                recordContactID.toLowerCase() === contactId.toLowerCase() &&
                recordCaseID.toLowerCase() === incidentId.toLowerCase()
            );
        });

        if (!validRecords) {
            return respondError(res, {
                status: 403,
                code: "WATCHLIST_OWNERSHIP_MISMATCH",
                message: "Request not permitted"
            });
        }

        const watchingOnlyRecords = records.filter(
            (record) => record.pinswg_representationsubmitted == null
        );

        let existingRecord;

        if (isRepresentationSubmission) {
            // Reuse a watching-only record for the first representation.
            // Never overwrite an earlier representation submission.
            existingRecord =
                watchingOnlyRecords.length === 1
                    ? watchingOnlyRecords[0]
                    : null;
        } else {
            // Watching or subscribing: prefer a watching-only record.
            // Otherwise reuse an existing representation-associated record.
            existingRecord = watchingOnlyRecords[0] ?? records[0] ?? null;
        }

        const method = existingRecord ? "patch" : "post";

        const queryUrl = existingRecord
            ? `pinswg_watchlists(${existingRecord.pinswg_watchlistid})`
            : "pinswg_watchlists";

        const config = {
            method: method,
            url: WEBAPI_URL + queryUrl + hashAPIPath(queryUrl),
            headers: {
                "OData-MaxVersion": "4.0",
                "OData-Version": "4.0",
                Accept: "application/json",
                Prefer: 'odata.include-annotations="*",return=representation',
                Authorization: "Bearer " + token.access_token,
                "Content-Type": "application/json"
            },
            data: JSON.stringify({
                ...data,
                "pinswg_Contact@odata.bind": `/contacts(${contacts[0].contactid.trim()})`
            })
        };

        const result = await axios(config);
        return respondSuccess(res, result.data);
    } catch (err) {
        consoleLogger(err);
        return respondError(res, {
            status: 400,
            code: "WATCHED_CASE_UPSERT_FAILED",
            message: "Failed to create or update watched case"
        });
    }
}