import db from '../../database/models/index.js';
import { Op } from 'sequelize';
import { sendEmail } from './email.service.js';
import { NotificationService } from '../../services/NotificationService.js';
import { REQUEST_TYPES } from '../config/constants.js';

const { RequestParticipant, User, Outlet, District } = db;

const frontendBase = () => process.env.FRONTEND_URL || 'http://localhost:5173';

/** Dealer acknowledgement + internal reviewers after resignation is created. */
export async function notifyResignationSubmittedEmails(resignation: any): Promise<void> {
    const dealerUser = await User.findByPk(resignation.dealerId, {
        attributes: ['id', 'email', 'fullName']
    });
    if (!dealerUser?.email) return;

    const base = frontendBase();
    const resignationCode = resignation.resignationId || resignation.id;
    const lwd =
        resignation.lastOperationalDateSales ||
        resignation.lastOperationalDateServices ||
        'As per application';
    const dealerName = dealerUser.fullName || 'Dealer';

    await sendEmail(
        dealerUser.email,
        `We received your resignation request — ${resignationCode}`,
        'RESIGNATION_RECEIVED',
        {
            dealerName,
            resignationId: resignationCode,
            lwd: String(lwd),
            link: `${base}/dealer-resignation/${resignation.id}`,
            ctaLabel: 'View request'
        }
    ).catch((err) => console.error('[notifyResignationSubmittedEmails] dealer ack:', err));

    const participants = await RequestParticipant.findAll({
        where: {
            requestId: resignation.id,
            requestType: REQUEST_TYPES.RESIGNATION,
            userId: { [Op.ne]: resignation.dealerId }
        },
        include: [{ model: User, as: 'user', attributes: ['id', 'email', 'fullName'] }]
    });

    const internalLink = `${base}/resignation/${resignation.id}`;
    for (const p of participants) {
        const u = (p as any).user;
        if (!u?.email) continue;
        await NotificationService.notify(u.id, u.email, {
            title: `New resignation request: ${resignationCode}`,
            message: `Submitted by ${dealerName}.`,
            channels: ['email', 'system'],
            templateCode: 'RESIGNATION_SUBMITTED',
            placeholders: {
                dealerName,
                resignationId: resignationCode,
                lwd: String(lwd),
                link: internalLink,
                ctaLabel: 'Review resignation'
            }
        }).catch((err) => console.error('[notifyResignationSubmittedEmails] internal:', err));
    }
}

/** Internal reviewers after constitutional request is created. */
export async function notifyConstitutionalSubmittedEmails(request: any, dealerDisplayName: string): Promise<void> {
    const participants = await RequestParticipant.findAll({
        where: {
            requestId: request.id,
            requestType: REQUEST_TYPES.CONSTITUTIONAL,
            userId: { [Op.ne]: request.dealerId }
        },
        include: [{ model: User, as: 'user', attributes: ['id', 'email', 'fullName'] }]
    });

    const base = frontendBase();
    const link = `${base}/constitutional-change/${request.id}`;

    for (const p of participants) {
        const u = (p as any).user;
        if (!u?.email) continue;
        await NotificationService.notify(u.id, u.email, {
            title: `New constitutional change request: ${request.requestId}`,
            message: `${dealerDisplayName} submitted a request.`,
            channels: ['email', 'system'],
            templateCode: 'CONSTITUTIONAL_CHANGE_SUBMITTED',
            placeholders: {
                dealerName: dealerDisplayName,
                changeType: request.changeType || '',
                requestId: request.requestId,
                link,
                ctaLabel: 'Review request'
            }
        }).catch((err) => console.error('[notifyConstitutionalSubmittedEmails]:', err));
    }
}

/** Dealer + ASM when relocation request is submitted. */
export async function notifyRelocationSubmittedEmails(
    request: any,
    submitter: { email: string; fullName?: string | null }
): Promise<void> {
    const base = frontendBase();
    const code = request.requestId || request.id;
    const dealerName = submitter.fullName?.trim() || 'Dealer';

    if (submitter.email) {
        await sendEmail(
            submitter.email,
            `Relocation request received — ${code}`,
            'RELOCATION_RECEIVED',
            {
                dealerName,
                requestId: code,
                link: `${base}/relocation-requests/${request.id}`,
                ctaLabel: 'View request'
            }
        ).catch((err) => console.error('[notifyRelocationSubmittedEmails] dealer:', err));
    }

    const outlet = await Outlet.findByPk(request.outletId, {
        include: [{ model: District, as: 'district', attributes: ['id', 'asmId'] }]
    });
    const asmId = (outlet as any)?.district?.asmId;
    if (!asmId) return;

    const asm = await User.findByPk(asmId, { attributes: ['id', 'email', 'fullName'] });
    if (!asm?.email) return;

    await NotificationService.notify(asm.id, asm.email, {
        title: `New relocation request: ${code}`,
        message: 'A dealer submitted an outlet relocation request.',
        channels: ['email', 'system'],
        templateCode: 'RELOCATION_SUBMITTED',
        placeholders: {
            dealerName,
            requestId: code,
            outletCode: outlet?.code || '',
            link: `${base}/relocation-requests/${request.id}`,
            ctaLabel: 'Review relocation'
        }
    }).catch((err) => console.error('[notifyRelocationSubmittedEmails] ASM:', err));
}