import Series from "../../../../models/series.js";
import Event from "../../../../models/event.js";
import Member from "../../../../models/member.js";
import {
  validateSeriesTicketPurchase,
  calculateSeriesTicketPrice,
  reserveSeriesTicket,
  releaseSeriesTicket,
  completeSeriesTicketPurchase,
  registerForAllSeriesEvents,
} from "../../../../utils/tickets.js";
import { sendSeriesPassConfirmation } from "../../../../utils/resend.js";

export default defineEventHandler(async (event) => {
  try {
    const seriesId = getRouterParam(event, "id");
    const body = await readBody(event);
    const { name, email, paymentId } = body;

    // Validate input
    if (!name || !email) {
      throw createError({
        statusCode: 400,
        statusMessage: "Name and email are required",
      });
    }

    // Fetch series
    // Build query conditions based on whether seriesId looks like ObjectId or string
    const isObjectId = /^[0-9a-fA-F]{24}$/.test(seriesId);
    const seriesQuery = isObjectId
      ? { $or: [{ _id: seriesId }, { id: seriesId }, { slug: seriesId }] }
      : { $or: [{ id: seriesId }, { slug: seriesId }] };

    const series = await Series.findOne(seriesQuery);

    if (!series) {
      throw createError({
        statusCode: 404,
        statusMessage: "Series not found",
      });
    }

    // Check membership
    let member = null;
    member = await Member.findOne({ email: email.toLowerCase() });

    // Validate purchase
    const validation = validateSeriesTicketPurchase(series, {
      email,
      name,
      member,
    });

    if (!validation.valid) {
      throw createError({
        statusCode: 400,
        statusMessage: validation.reason,
      });
    }

    const { ticketInfo } = validation;

    // For paid tickets, require payment ID
    if (!ticketInfo.isFree && !paymentId) {
      throw createError({
        statusCode: 400,
        statusMessage: "Payment is required for this series pass",
      });
    }

    // Create series registration
    const registration = {
      memberId: member?._id,
      name,
      email: email.toLowerCase(),
      membershipLevel: member?.circle || "non-member",
      isMember: !!member,
      ticketType: ticketInfo.ticketType,
      ticketPrice: ticketInfo.price,
      paymentStatus: ticketInfo.isFree ? "not_required" : "completed",
      paymentId: paymentId || null,
      amountPaid: ticketInfo.price,
      registeredAt: new Date(),
      eventRegistrations: [],
    };

    series.registrations.push(registration);
    await completeSeriesTicketPurchase(series, ticketInfo.ticketType);

    // Get the newly created registration
    const newRegistration =
      series.registrations[series.registrations.length - 1];

    // Fetch all events in this series
    const seriesEvents = await Event.find({
      "series.id": series.id,
      isCancelled: false,
    }).sort({ "series.position": 1, startDate: 1 });

    // Register user for all events
    const eventRegistrations = await registerForAllSeriesEvents(
      series,
      seriesEvents,
      newRegistration,
    );

    // Send confirmation email
    try {
      await sendSeriesPassConfirmation({
        to: email,
        name,
        series: {
          title: series.title,
          description: series.description,
          type: series.type,
        },
        ticket: {
          type: ticketInfo.ticketType,
          price: ticketInfo.price,
          currency: ticketInfo.currency,
          isFree: ticketInfo.isFree,
        },
        events: seriesEvents.map((e) => ({
          title: e.title,
          startDate: e.startDate,
          endDate: e.endDate,
          location: e.location,
        })),
        paymentId,
      });
    } catch (emailError) {
      console.error(
        "Failed to send series pass confirmation email:",
        emailError,
      );
      // Don't fail the registration if email fails
    }

    return {
      success: true,
      message: "Series pass purchased successfully",
      registration: {
        id: newRegistration._id,
        ticketType: newRegistration.ticketType,
        amountPaid: newRegistration.amountPaid,
        eventsRegistered: eventRegistrations.filter((r) => r.success).length,
        totalEvents: seriesEvents.length,
      },
      events: eventRegistrations.map((r) => ({
        eventId: r.eventId,
        success: r.success,
        reason: r.reason,
      })),
    };
  } catch (error) {
    console.error("Error purchasing series pass:", error);
    throw createError({
      statusCode: error.statusCode || 500,
      statusMessage: error.statusMessage || "Failed to purchase series pass",
    });
  }
});