export const inquiryIntents = [
  "general",
  "exhibitor",
  "sponsor",
  "partnership",
  "startup_referral",
  "sales",
  "press",
  "newsletter",
] as const;

export type InquiryIntent = (typeof inquiryIntents)[number];

export type InquiryPayload = {
  intent: InquiryIntent;
  name: string;
  email: string;
  company?: string;
  message: string;
  phone?: string;
  firstName?: string;
  lastName?: string;
  consent: boolean;
  startupName?: string;
  startupWebsite?: string;
  startupSector?: string;
  whyRecommend?: string;
  jobTitle?: string;
  companyWebsite?: string;
  companyDescription?: string;
  sector?: string;
  productsToAdvertise?: string;
  boothSize?: string;
  powerRequired?: boolean;
  internetRequired?: boolean;
  staffCount?: string;
  marketingMaterials?: string;
  specialRequirements?: string;
};

function parseEmail(email: unknown) {
  return typeof email === "string" ? email.trim() : "";
}

function requireConsent(consent: unknown): boolean {
  return consent === true;
}

export function validateInquiry(
  body: unknown
): { ok: true; data: InquiryPayload } | { ok: false; error: string } {
  if (!body || typeof body !== "object") {
    return { ok: false, error: "Invalid request body" };
  }

  const b = body as Record<string, unknown>;
  const intent = b.intent as InquiryIntent;

  if (!inquiryIntents.includes(intent)) {
    return { ok: false, error: "Invalid intent" };
  }

  const email = parseEmail(b.email);
  if (!email || !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
    return { ok: false, error: "Valid email is required" };
  }

  if (intent === "partnership") {
    const firstName = typeof b.firstName === "string" ? b.firstName.trim() : "";
    const lastName = typeof b.lastName === "string" ? b.lastName.trim() : "";
    const company = typeof b.company === "string" ? b.company.trim() : "";

    if (!firstName || firstName.length < 2) {
      return { ok: false, error: "First name is required" };
    }
    if (!lastName || lastName.length < 2) {
      return { ok: false, error: "Last name is required" };
    }
    if (!company) {
      return { ok: false, error: "Company name is required" };
    }
    if (!requireConsent(b.consent)) {
      return { ok: false, error: "You must agree to data collection to submit" };
    }

    return {
      ok: true,
      data: {
        intent,
        firstName,
        lastName,
        name: `${firstName} ${lastName}`,
        email,
        company,
        message:
          typeof b.message === "string" && b.message.trim()
            ? b.message.trim()
            : "Partnership information request",
        consent: true,
      },
    };
  }

  if (intent === "exhibitor") {
    const firstName = typeof b.firstName === "string" ? b.firstName.trim() : "";
    const lastName = typeof b.lastName === "string" ? b.lastName.trim() : "";
    const company = typeof b.company === "string" ? b.company.trim() : "";
    const phone = typeof b.phone === "string" ? b.phone.trim() : "";
    const jobTitle = typeof b.jobTitle === "string" ? b.jobTitle.trim() : "";
    const companyDescription =
      typeof b.companyDescription === "string" ? b.companyDescription.trim() : "";
    const productsToAdvertise =
      typeof b.productsToAdvertise === "string" ? b.productsToAdvertise.trim() : "";
    const boothSize = typeof b.boothSize === "string" ? b.boothSize.trim() : "";
    const sector = typeof b.sector === "string" ? b.sector.trim() : "";
    const message = typeof b.message === "string" ? b.message.trim() : "";

    if (!firstName || firstName.length < 2) {
      return { ok: false, error: "First name is required" };
    }
    if (!lastName || lastName.length < 2) {
      return { ok: false, error: "Last name is required" };
    }
    if (!company) {
      return { ok: false, error: "Company name is required" };
    }
    if (!phone) {
      return { ok: false, error: "Phone number is required" };
    }
    if (!jobTitle) {
      return { ok: false, error: "Job title is required" };
    }
    if (!sector) {
      return { ok: false, error: "Industry / sector is required" };
    }
    if (!companyDescription || companyDescription.length < 20) {
      return { ok: false, error: "Please describe your company (at least 20 characters)" };
    }
    if (!productsToAdvertise || productsToAdvertise.length < 20) {
      return {
        ok: false,
        error: "Please describe the products you plan to advertise (at least 20 characters)",
      };
    }
    if (!boothSize) {
      return { ok: false, error: "Preferred booth size is required" };
    }
    if (!message || message.length < 10) {
      return { ok: false, error: "Please describe your booth goals (at least 10 characters)" };
    }
    if (!requireConsent(b.consent)) {
      return { ok: false, error: "You must agree to data collection to submit" };
    }

    return {
      ok: true,
      data: {
        intent,
        firstName,
        lastName,
        name: `${firstName} ${lastName}`,
        email,
        phone,
        jobTitle,
        company,
        companyWebsite:
          typeof b.companyWebsite === "string" ? b.companyWebsite.trim() : undefined,
        companyDescription,
        sector,
        productsToAdvertise,
        boothSize,
        powerRequired: b.powerRequired === true,
        internetRequired: b.internetRequired === true,
        staffCount: typeof b.staffCount === "string" ? b.staffCount.trim() : undefined,
        marketingMaterials:
          typeof b.marketingMaterials === "string" ? b.marketingMaterials.trim() : undefined,
        specialRequirements:
          typeof b.specialRequirements === "string" ? b.specialRequirements.trim() : undefined,
        message,
        consent: true,
      },
    };
  }

  if (intent === "startup_referral") {
    const name = typeof b.name === "string" ? b.name.trim() : "";
    const startupName = typeof b.startupName === "string" ? b.startupName.trim() : "";
    const whyRecommend = typeof b.whyRecommend === "string" ? b.whyRecommend.trim() : "";

    if (!name || name.length < 2) {
      return { ok: false, error: "Your name is required" };
    }
    if (!startupName) {
      return { ok: false, error: "Startup name is required" };
    }
    if (!whyRecommend || whyRecommend.length < 20) {
      return { ok: false, error: "Please tell us why you recommend this startup (at least 20 characters)" };
    }
    if (!requireConsent(b.consent)) {
      return { ok: false, error: "You must agree to data collection to submit" };
    }

    return {
      ok: true,
      data: {
        intent,
        name,
        email,
        startupName,
        startupWebsite:
          typeof b.startupWebsite === "string" ? b.startupWebsite.trim() : undefined,
        startupSector:
          typeof b.startupSector === "string" ? b.startupSector.trim() : undefined,
        whyRecommend,
        message: whyRecommend,
        consent: true,
      },
    };
  }

  if (!requireConsent(b.consent)) {
    return { ok: false, error: "You must agree to data collection to submit" };
  }

  if (intent === "newsletter") {
    const firstName = typeof b.firstName === "string" ? b.firstName.trim() : "";
    const lastName = typeof b.lastName === "string" ? b.lastName.trim() : "";
    const nameFromFields = `${firstName} ${lastName}`.trim();
    const name = nameFromFields || (typeof b.name === "string" ? b.name.trim() : "");

    if (!firstName || firstName.length < 2) {
      return { ok: false, error: "First name is required" };
    }
    if (!lastName || lastName.length < 2) {
      return { ok: false, error: "Last name is required" };
    }

    return {
      ok: true,
      data: {
        intent,
        firstName,
        lastName,
        name,
        email,
        message: "Newsletter signup",
        consent: true,
      },
    };
  }

  const name = typeof b.name === "string" ? b.name.trim() : "";
  const message = typeof b.message === "string" ? b.message.trim() : "";

  if (!name || name.length < 2) {
    return { ok: false, error: "Name is required" };
  }

  if (!message || message.length < 10) {
    return { ok: false, error: "Message must be at least 10 characters" };
  }

  return {
    ok: true,
    data: {
      intent,
      name,
      email,
      message,
      company: typeof b.company === "string" ? b.company.trim() : undefined,
      phone: typeof b.phone === "string" ? b.phone.trim() : undefined,
      consent: true,
    },
  };
}