import { NextRequest, NextResponse } from "next/server";
import { prisma } from "../../../../../lib/server/db";
import {
  getSessionPepper,
  isDatabaseConfigured,
} from "../../../../../lib/server/env";
import { hashSessionToken, newSessionToken } from "../../../../../lib/server/hash";
import { sendRuleStakeholderInviteEmail } from "../../../../../lib/server/mail";
import { apiRoute } from "../../../../../lib/server/apiRoute";
import { logRouteError } from "../../../../../lib/server/requestId";
import { stakeholderInviteVerifyUrl } from "../../../../../lib/server/ruleStakeholderInviteOps";
import { RULE_STAKEHOLDER_INVITER_FALLBACK } from "../../../../../lib/server/ruleStakeholderInviteMail";
import { STAKEHOLDER_INVITE_TTL_MS } from "../../../../../lib/server/ruleStakeholders";
import {
  dbUnavailable,
  errorJson,
  rateLimited,
  serverMisconfigured,
} from "../../../../../lib/server/responses";
import { rateLimitKey } from "../../../../../lib/server/rateLimit";
import { getPublicOrigin } from "../../../../../lib/server/publicOrigin";
import { readLimitedJson } from "../../../../../lib/server/validation/requestBody";
import { jsonFromZodError } from "../../../../../lib/server/validation/zodHttp";
import { resendExpiredStakeholderInviteBodySchema } from "../../../../../lib/server/validation/createFlowSchemas";

function clientIp(request: NextRequest): string {
  return (
    request.headers.get("x-forwarded-for")?.split(",")[0]?.trim() ??
    request.headers.get("x-real-ip") ??
    "unknown"
  );
}

export const POST = apiRoute(
  "invites.ruleStakeholder.resendExpired",
  async (request: NextRequest, _ctx, { requestId }) => {
    if (!isDatabaseConfigured()) {
      return dbUnavailable();
    }

    const body = await readLimitedJson(request);
    if (body.ok === false) return body.response;
    const parsed = resendExpiredStakeholderInviteBodySchema.safeParse(body.value);
    if (!parsed.success) return jsonFromZodError(parsed.error);

    const { token, email } = parsed.data;
    const rl = rateLimitKey(
      `invite-resend-expired:${clientIp(request)}:${email}`,
      60_000,
    );
    if (rl.ok === false) {
      return rateLimited(rl.retryAfterMs);
    }

    let pepper: string;
    try {
      pepper = getSessionPepper();
    } catch (err) {
      logRouteError("invites.ruleStakeholder.resendExpired", requestId, err, {
        phase: "getSessionPepper",
      });
      return serverMisconfigured();
    }

    const tokenHash = hashSessionToken(token, pepper);
    const row = await prisma.ruleStakeholder.findUnique({
      where: { inviteTokenHash: tokenHash },
      select: {
        id: true,
        email: true,
        inviteTokenHash: true,
        inviteExpiresAt: true,
        invitedBy: { select: { email: true } },
        rule: {
          select: {
            title: true,
            summary: true,
            document: true,
            user: { select: { email: true } },
          },
        },
      },
    });

    if (!row || row.email !== email) {
      return NextResponse.json({ ok: true });
    }

    const prevHash = row.inviteTokenHash;
    const prevExp = row.inviteExpiresAt;
    const nextToken = newSessionToken();
    const newHash = hashSessionToken(nextToken, pepper);
    const newExp = new Date(Date.now() + STAKEHOLDER_INVITE_TTL_MS);

    await prisma.ruleStakeholder.update({
      where: { id: row.id },
      data: {
        inviteTokenHash: newHash,
        inviteExpiresAt: newExp,
      },
    });

    const origin = getPublicOrigin(request);
    const verifyUrl = stakeholderInviteVerifyUrl(origin, nextToken);
    const inviterEmail =
      row.invitedBy?.email ??
      row.rule.user?.email ??
      RULE_STAKEHOLDER_INVITER_FALLBACK;
    try {
      await sendRuleStakeholderInviteEmail({
        to: row.email,
        verifyUrl,
        origin,
        communityName: row.rule.title,
        inviterEmail,
        summary: row.rule.summary,
        document: row.rule.document,
      });
    } catch (err) {
      logRouteError("invites.ruleStakeholder.resendExpired", requestId, err, {
        phase: "sendRuleStakeholderInviteEmail",
      });
      await prisma.ruleStakeholder
        .update({
          where: { id: row.id },
          data: {
            inviteTokenHash: prevHash,
            inviteExpiresAt: prevExp,
          },
        })
        .catch(() => {});
      return errorJson(
        "mail_failed",
        "Could not resend stakeholder invite",
        502,
      );
    }

    return NextResponse.json({ ok: true });
  },
);