import { prisma } from "./db";
import { isDatabaseConfigured } from "./env";
import {
  sendWorkshopInquiryConfirmation,
  sendWorkshopInquiryNotification,
} from "./mail";
import { rateLimitKey } from "./rateLimit";
import { logger } from "../logger";
import {
  WORKSHOP_INQUIRY_RETENTION_MS,
  WORKSHOP_MIN_FILL_MS,
  suggestWorkshopRoute,
  type WorkshopFormValues,
} from "../workshopSignup";
import {
  parseWorkshopSignupPayload,
  type ParsedWorkshopSignup,
} from "./validation/workshopSignupSchemas";

const EMAIL_MIN_INTERVAL_MS = 60 * 1000;

export type WorkshopSignupStatus =
  | "sent"
  | "invalid"
  | "failed"
  | "rate_limited"
  | "unavailable";

export interface WorkshopSignupResult {
  status: WorkshopSignupStatus;
  largeOrganization: boolean;
  values: WorkshopFormValues;
  fieldErrors: ParsedWorkshopSignup["fieldErrors"];
}

function inboxAddress(): string | null {
  const raw = process.env.WORKSHOP_INQUIRY_TO?.trim();
  return raw && raw.length > 0 ? raw : null;
}

function schedulingUrl(): string {
  return process.env.NEXT_PUBLIC_WORKSHOP_SCHEDULING_URL?.trim() ?? "";
}

function resultFromParse(
  parsed: ParsedWorkshopSignup,
  status: WorkshopSignupStatus,
  largeOrganization = false,
): WorkshopSignupResult {
  return {
    status,
    largeOrganization,
    values: parsed.values,
    fieldErrors: parsed.fieldErrors,
  };
}

/**
 * Save a valid inquiry, then email the inbox and the person who wrote.
 * A filled honeypot or a too-fast submit shows the confirmation and saves nothing.
 * A failed save sends nothing. A failed email keeps the row for a later retry.
 */
export async function submitWorkshopSignup(
  raw: unknown,
  requestId: string,
): Promise<WorkshopSignupResult> {
  const parsed = parseWorkshopSignupPayload(raw);

  if (Object.keys(parsed.fieldErrors).length > 0) {
    return resultFromParse(parsed, "invalid");
  }

  const tooFast =
    parsed.startedAt === null ||
    Date.now() - parsed.startedAt < WORKSHOP_MIN_FILL_MS;

  if (parsed.honeypot.length > 0 || tooFast) {
    return resultFromParse(parsed, "sent", false);
  }

  const limited = rateLimitKey(
    `workshop-signup-email:${parsed.values.email}`,
    EMAIL_MIN_INTERVAL_MS,
  );
  if (limited.ok === false) {
    return resultFromParse(parsed, "rate_limited");
  }

  if (!isDatabaseConfigured()) {
    return resultFromParse(parsed, "unavailable");
  }

  const route = suggestWorkshopRoute(parsed.values);

  let inquiryId: string;
  try {
    const row = await prisma.workshopInquiry.create({
      data: {
        challenges: parsed.values.challenges,
        challengeOther: parsed.values.challengeOther || null,
        unspokenQuestion: parsed.values.unspokenQuestion || null,
        organizationName: parsed.values.organizationName,
        organizationKind: parsed.values.organizationKind,
        memberCount: parsed.values.memberCount,
        contactName: parsed.values.contactName,
        email: parsed.values.email,
        role: parsed.values.role || null,
        sourcePage: parsed.values.sourcePage,
        sourceUrl: parsed.values.sourceUrl || null,
        routeSuggestion: route.note,
        largeOrganization: route.largeOrganization,
      },
    });
    inquiryId = row.id;
  } catch (err) {
    logger.error("workshop-signup.save", err);
    return resultFromParse(parsed, "failed");
  }

  await deliverWorkshopInquiryMail(inquiryId, parsed.values, route, requestId, {
    inbox: true,
    confirmation: true,
  });

  return resultFromParse(parsed, "sent", route.largeOrganization);
}

async function deliverWorkshopInquiryMail(
  inquiryId: string,
  values: WorkshopFormValues,
  route: { note: string; largeOrganization: boolean },
  requestId: string,
  which: { inbox: boolean; confirmation: boolean },
): Promise<void> {
  const to = inboxAddress();
  if (which.inbox && to) {
    try {
      await sendWorkshopInquiryNotification({
        to,
        values,
        routeNote: route.note,
        largeOrganization: route.largeOrganization,
        requestId,
        schedulingUrl: schedulingUrl(),
      });
      await prisma.workshopInquiry.update({
        where: { id: inquiryId },
        data: { inboxNotifiedAt: new Date() },
      });
    } catch (err) {
      logger.error("workshop-signup.inbox-mail", err);
    }
  }

  if (which.confirmation) {
    try {
      await sendWorkshopInquiryConfirmation({
        to: values.email,
        largeOrganization: route.largeOrganization,
        schedulingUrl: schedulingUrl(),
      });
      await prisma.workshopInquiry.update({
        where: { id: inquiryId },
        data: { confirmationSentAt: new Date() },
      });
    } catch (err) {
      logger.error("workshop-signup.confirmation-mail", err);
    }
  }
}

/** Retry inbox and confirmation mail for rows that were saved but not sent. */
export async function retryPendingWorkshopInquiryMail(): Promise<number> {
  if (!isDatabaseConfigured()) return 0;

  const pending = await prisma.workshopInquiry.findMany({
    where: {
      OR: [{ inboxNotifiedAt: null }, { confirmationSentAt: null }],
    },
    orderBy: { createdAt: "asc" },
    take: 50,
  });

  let sent = 0;
  for (const row of pending) {
    const values: WorkshopFormValues = {
      challenges: row.challenges,
      challengeOther: row.challengeOther ?? "",
      unspokenQuestion: row.unspokenQuestion ?? "",
      organizationName: row.organizationName,
      organizationKind: row.organizationKind,
      memberCount: row.memberCount,
      contactName: row.contactName,
      email: row.email,
      role: row.role ?? "",
      sourcePage: row.sourcePage,
      sourceUrl: row.sourceUrl ?? "",
    };
    const beforeInbox = row.inboxNotifiedAt;
    const beforeConfirmation = row.confirmationSentAt;
    await deliverWorkshopInquiryMail(
      row.id,
      values,
      { note: row.routeSuggestion, largeOrganization: row.largeOrganization },
      `retry-${row.id}`,
      {
        inbox: row.inboxNotifiedAt === null,
        confirmation: row.confirmationSentAt === null,
      },
    );
    const after = await prisma.workshopInquiry.findUnique({ where: { id: row.id } });
    if (
      after &&
      ((beforeInbox === null && after.inboxNotifiedAt !== null) ||
        (beforeConfirmation === null && after.confirmationSentAt !== null))
    ) {
      sent += 1;
    }
  }
  return sent;
}

/** Delete inquiries older than the retention period. */
export async function purgeExpiredWorkshopInquiries(now = new Date()): Promise<number> {
  if (!isDatabaseConfigured()) return 0;
  const cutoff = new Date(now.getTime() - WORKSHOP_INQUIRY_RETENTION_MS);
  const result = await prisma.workshopInquiry.deleteMany({
    where: { createdAt: { lt: cutoff } },
  });
  return result.count;
}