// Next.js API route support: https://nextjs.org/docs/api-routes/introduction
import { Module } from "@/interfaces";
import { sessionOptions } from "@/lib/session";
import { requestUser } from "@/utils/api";
import { createApprovalWorkflow, getApprovalWorkflowByFormIntaker, getApprovalWorkflows } from "@/utils/approval.workflows.be";
import { withIronSessionApiRoute } from "iron-session/next";
import type { NextApiRequest, NextApiResponse } from "next";

export default withIronSessionApiRoute(handler, sessionOptions);

interface PostRequestBody {
    examAuthor: string;
    examEntities: string[];
    examId: string;
    examName: string;
    examModule: Module;
}

async function handler(req: NextApiRequest, res: NextApiResponse) {
    if (req.method === "GET") return await get(req, res);
    if (req.method === "POST") return await post(req, res);
}

async function get(req: NextApiRequest, res: NextApiResponse) {
    const user = await requestUser(req, res);
    if (!user) return res.status(401).json({ ok: false });

    if (!["admin", "developer", "teacher", "corporate", "mastercorporate"].includes(user.type)) {
        return res.status(403).json({ ok: false });
    }

    return res.status(200).json(await getApprovalWorkflows("active-workflows"));
}

async function post(req: NextApiRequest, res: NextApiResponse) {
    const user = await requestUser(req, res);
    if (!user) return res.status(401).json({ ok: false });

    if (!["admin", "developer", "teacher", "corporate", "mastercorporate"].includes(user.type)) {
        return res.status(403).json({ ok: false });
    }

    const { examAuthor, examEntities, examId, examModule } = req.body as PostRequestBody;

    const results = await Promise.all(
        examEntities.map(async (entity) => {
            const configuredWorkflow = await getApprovalWorkflowByFormIntaker(entity, examAuthor);
            if (!configuredWorkflow) {
                return { entity, created: false, error: "No configured workflow found for examAuthor." };
            }

            configuredWorkflow.modules.push(examModule);
            configuredWorkflow.name = `${examId}`;
            configuredWorkflow.examId = examId;
            configuredWorkflow.entityId = entity;
            configuredWorkflow.startDate = Date.now();

            try {
                const creationResponse = await createApprovalWorkflow("active-workflows", configuredWorkflow);
                return { entity, created: true, creationResponse };
            } catch (error) {
                const err = error as Error;
                return { entity, created: false, error: err.message };
            }
        })
    );

    const successCount = results.filter((r) => r.created).length;
    const totalCount = examEntities.length;

    if (successCount === totalCount) {
        return res.status(200).json({ ok: true, results });
    } else if (successCount > 0) {
        return res.status(207).json({ ok: true, results });
    } else {
        return res.status(404).json({ ok: false, message: "No workflows were created", results });
    }
}