"use client"

import type React from "react"

import { Button } from "@/components/ui/button"
import { Card, CardContent, CardDescription, CardHeader, CardTitle } from "@/components/ui/card"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { Textarea } from "@/components/ui/textarea"
import { Checkbox } from "@/components/ui/checkbox"
import { RadioGroup, RadioGroupItem } from "@/components/ui/radio-group"
import Link from "next/link"
import { useState } from "react"

export default function RegisterPage() {
  const [step, setStep] = useState<"form" | "payment">("form")
  const [isSubmitting, setIsSubmitting] = useState(false)
  const [includeAccommodation, setIncludeAccommodation] = useState(true)
  const [accommodationVenue, setAccommodationVenue] = useState<"commons-hub" | "herrnhof">("commons-hub")
  const [accommodationType, setAccommodationType] = useState("ch-multi")
  const [formData, setFormData] = useState({
    name: "",
    contact: "",
    contributions: "",
    expectations: "",
    howHeard: "",
    dietary: [] as string[],
    dietaryOther: "",
    crewConsent: "",
  })
  const baseTicketPrice = 80 // Early bird price €80

  const accommodationPrices: Record<string, { label: string; price: number }> = {
    "ch-multi": { label: "Bed in shared room (Commons Hub)", price: 274.40 },
    "ch-double": { label: "Bed in double room (Commons Hub)", price: 351.40 },
    "hh-single": { label: "Single room (Herrnhof)", price: 95 },
    "hh-double-separate": { label: "Double room, separate beds (Herrnhof)", price: 60 },
    "hh-double-shared": { label: "Double room, shared double bed (Herrnhof)", price: 50 },
    "hh-triple": { label: "Triple room, one single + one shared double bed (Herrnhof)", price: 50 },
    "hh-daybed": { label: "Daybed or extra bed in living room (Herrnhof)", price: 40 },
  }

  const accommodationPrice = accommodationPrices[accommodationType]?.price ?? 0
  const totalPrice =
    baseTicketPrice +
    (includeAccommodation ? accommodationPrice : 0)

  const handleSubmit = async (e: React.FormEvent) => {
    e.preventDefault()
    // Validate required fields
    if (
      !formData.name ||
      !formData.contact ||
      !formData.contributions ||
      !formData.expectations ||
      !formData.crewConsent
    ) {
      alert("Please fill in all required fields")
      return
    }

    setIsSubmitting(true)

    try {
      // Submit registration to Google Sheet first
      const dietaryString =
        formData.dietary.join(", ") +
        (formData.dietaryOther ? `, ${formData.dietaryOther}` : "")

      const response = await fetch("/api/register", {
        method: "POST",
        headers: {
          "Content-Type": "application/json",
        },
        body: JSON.stringify({
          name: formData.name,
          contact: formData.contact,
          contributions: formData.contributions,
          expectations: formData.expectations,
          howHeard: formData.howHeard,
          dietary: dietaryString,
          crewConsent: formData.crewConsent,
        }),
      })

      if (!response.ok) {
        throw new Error("Failed to record registration")
      }

      // Proceed to payment step
      setStep("payment")
    } catch (error) {
      console.error("Registration error:", error)
      alert("There was an error recording your registration. Please try again.")
    } finally {
      setIsSubmitting(false)
    }
  }

  const handleDietaryChange = (value: string, checked: boolean) => {
    setFormData((prev) => ({
      ...prev,
      dietary: checked ? [...prev.dietary, value] : prev.dietary.filter((item) => item !== value),
    }))
  }

  if (step === "payment") {
    return (
      <div className="min-h-screen bg-background">
        {/* Header */}
        <header className="border-b">
          <div className="container mx-auto px-4 py-4">
            <Link href="/" className="text-2xl font-bold text-primary">
              CCG
            </Link>
          </div>
        </header>

        <main className="container mx-auto px-4 py-12 max-w-5xl">
          <div className="text-center mb-12">
            <h1 className="text-4xl md:text-5xl font-bold mb-4">Complete Your Registration</h1>
            <p className="text-xl text-muted-foreground">Choose your payment method</p>
          </div>

          <Card className="mb-8 border-primary/40">
            <CardHeader>
              <CardTitle>Event Registration</CardTitle>
              <CardDescription>
                Early bird pricing available until March 31, 2026
              </CardDescription>
            </CardHeader>
            <CardContent>
              <div className="space-y-4">
                {/* Ticket */}
                <div className="flex items-start justify-between py-4 border-b border-border">
                  <div>
                    <div className="font-medium">CCG 2026 Ticket</div>
                    <div className="text-sm text-muted-foreground">
                      €80 Early bird (until Mar 31) · €120 Regular (Apr-Jun) · €150 Late (after Jul 1)
                    </div>
                    <div className="text-xs text-muted-foreground mt-1">
                      CCA members: Bring two newcomers, get a free ticket!
                    </div>
                  </div>
                  <span className="text-lg font-semibold whitespace-nowrap ml-4">€{baseTicketPrice.toFixed(2)}</span>
                </div>

                {/* Accommodation */}
                <div className="py-4 border-b border-border">
                  <div className="flex items-start gap-3">
                    <Checkbox
                      id="include-accommodation"
                      checked={includeAccommodation}
                      onCheckedChange={(checked) => setIncludeAccommodation(checked as boolean)}
                      className="mt-1"
                    />
                    <div className="flex-1">
                      <div className="flex justify-between items-start">
                        <Label htmlFor="include-accommodation" className="font-medium cursor-pointer">
                          Accommodation (7 nights, Aug 16–23)
                        </Label>
                        {includeAccommodation && (
                          <span className="text-lg font-semibold whitespace-nowrap ml-4">€{accommodationPrice.toFixed(2)}</span>
                        )}
                      </div>
                      {includeAccommodation ? (
                        <div className="mt-3 space-y-4">
                          {/* Venue selection */}
                          <RadioGroup
                            value={accommodationVenue}
                            onValueChange={(value: string) => {
                              const venue = value as "commons-hub" | "herrnhof"
                              setAccommodationVenue(venue)
                              setAccommodationType(venue === "commons-hub" ? "ch-multi" : "hh-single")
                            }}
                            className="space-y-2"
                          >
                            <div className="flex items-center space-x-2">
                              <RadioGroupItem value="commons-hub" id="venue-ch" />
                              <Label htmlFor="venue-ch" className="font-medium cursor-pointer text-sm">
                                Commons Hub
                              </Label>
                            </div>
                            <div className="flex items-center space-x-2">
                              <RadioGroupItem value="herrnhof" id="venue-hh" />
                              <Label htmlFor="venue-hh" className="font-medium cursor-pointer text-sm">
                                Herrnhof Villa
                              </Label>
                            </div>
                          </RadioGroup>

                          {/* Sub-options per venue */}
                          {accommodationVenue === "commons-hub" ? (
                            <div className="pl-6 border-l-2 border-primary/20">
                              <p className="text-xs text-muted-foreground mb-2">
                                30 beds on-site at the main venue. Basic, communal accommodation.
                              </p>
                              <RadioGroup
                                value={accommodationType}
                                onValueChange={setAccommodationType}
                                className="space-y-2"
                              >
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="ch-multi" id="ch-multi" />
                                  <Label htmlFor="ch-multi" className="font-normal cursor-pointer text-sm">
                                    Bed in shared room — €274.40 (€39.20/night)
                                  </Label>
                                </div>
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="ch-double" id="ch-double" />
                                  <Label htmlFor="ch-double" className="font-normal cursor-pointer text-sm">
                                    Bed in double room — €351.40 (€50.20/night)
                                  </Label>
                                </div>
                              </RadioGroup>
                            </div>
                          ) : (
                            <div className="pl-6 border-l-2 border-primary/20">
                              <p className="text-xs text-muted-foreground mb-2">
                                Historic 19th-century mansion with newly renovated apartments, sauna,
                                and river swimming platform. Prices per person for 7 nights (incl. city tax &amp; VAT).
                              </p>
                              <RadioGroup
                                value={accommodationType}
                                onValueChange={setAccommodationType}
                                className="space-y-2"
                              >
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="hh-single" id="hh-single" />
                                  <Label htmlFor="hh-single" className="font-normal cursor-pointer text-sm">
                                    Single room — €95
                                  </Label>
                                </div>
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="hh-double-separate" id="hh-double-separate" />
                                  <Label htmlFor="hh-double-separate" className="font-normal cursor-pointer text-sm">
                                    Double room (separate beds) — €60/person
                                  </Label>
                                </div>
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="hh-double-shared" id="hh-double-shared" />
                                  <Label htmlFor="hh-double-shared" className="font-normal cursor-pointer text-sm">
                                    Double room (shared double bed) — €50/person
                                  </Label>
                                </div>
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="hh-triple" id="hh-triple" />
                                  <Label htmlFor="hh-triple" className="font-normal cursor-pointer text-sm">
                                    Triple room (one single, one shared double bed) — €50/person
                                  </Label>
                                </div>
                                <div className="flex items-center space-x-2">
                                  <RadioGroupItem value="hh-daybed" id="hh-daybed" />
                                  <Label htmlFor="hh-daybed" className="font-normal cursor-pointer text-sm">
                                    Daybed or extra bed in living room — €40/person
                                  </Label>
                                </div>
                              </RadioGroup>
                              <p className="text-xs text-muted-foreground mt-2">
                                For whole-apartment quotes, contact{" "}
                                <a href="mailto:office@commons-hub.at" className="text-primary hover:underline">office@commons-hub.at</a>.
                              </p>
                            </div>
                          )}
                        </div>
                      ) : (
                        <p className="text-sm text-muted-foreground mt-1">
                          I&apos;ll arrange my own accommodation
                        </p>
                      )}
                    </div>
                  </div>
                </div>

                {includeAccommodation && (
                  <p className="text-xs text-muted-foreground bg-muted/50 rounded-lg p-3">
                    We&apos;ll follow up closer to the event to confirm room assignments and accommodation details.
                  </p>
                )}

                {/* Food note */}
                <div className="py-4 border-b border-border">
                  <p className="text-sm text-muted-foreground">
                    <span className="font-medium text-foreground">Food:</span>{" "}
                    We&apos;ll follow up via email with food options and pricing closer to the event.
                    Your dietary preferences from step 1 have been noted.
                  </p>
                </div>

                {/* Total */}
                <div className="flex justify-between items-center py-4 bg-primary/10 -mx-6 px-6 mt-4">
                  <div>
                    <div className="font-bold text-lg">Total Amount</div>
                    <div className="text-sm text-muted-foreground">
                      Ticket{includeAccommodation ? " + accommodation" : ""}
                    </div>
                  </div>
                  <span className="text-2xl font-bold text-primary">€{totalPrice.toFixed(2)}</span>
                </div>
              </div>
            </CardContent>
          </Card>

          {/* Payment Methods */}
          <div className="space-y-6">
            <Card>
              <CardHeader>
                <CardTitle>Payment Options</CardTitle>
                <CardDescription>Choose your preferred payment method</CardDescription>
              </CardHeader>
              <CardContent className="space-y-4">
                <form action="/api/create-checkout-session" method="POST">
                  <input type="hidden" name="registrationData" value={JSON.stringify(formData)} />
                  <input type="hidden" name="includeAccommodation" value={includeAccommodation ? "true" : "false"} />
                  <input type="hidden" name="accommodationType" value={accommodationType} />

                  <div className="space-y-4">
                    <p className="text-sm text-muted-foreground">
                      You'll be redirected to Mollie's secure checkout where you can pay by credit card,
                      SEPA bank transfer, iDEAL, PayPal, or other methods.
                    </p>

                    <div className="flex gap-3 pt-4">
                      <Button type="button" variant="outline" onClick={() => setStep("form")} className="flex-1">
                        Back to Form
                      </Button>
                      <Button type="submit" className="flex-1">
                        Proceed to Payment
                      </Button>
                    </div>
                  </div>
                </form>
              </CardContent>
            </Card>

            <div className="text-center text-sm text-muted-foreground">
              <p>
                All payments are processed securely through Mollie. You'll receive a confirmation email after successful
                payment.
              </p>
            </div>
          </div>
        </main>

        {/* Footer */}
        <footer className="py-12 px-4 border-t border-border">
          <div className="container mx-auto max-w-6xl">
            <div className="grid sm:grid-cols-2 md:grid-cols-4 gap-8 mb-8">
              <div>
                <h3 className="font-bold mb-4">CCG 2026</h3>
                <p className="text-sm text-muted-foreground">
                  Crypto Commons Gathering
                  <br />
                  August 16-23, 2026
                </p>
              </div>

              <div>
                <h3 className="font-semibold mb-4 text-sm">Links</h3>
                <ul className="space-y-2 text-sm">
                  <li>
                    <Link href="/register" className="text-muted-foreground hover:text-foreground transition-colors">
                      Register to Attend
                    </Link>
                  </li>
                  <li>
                    <Link href="/gallery" className="text-muted-foreground hover:text-foreground transition-colors">
                      Gallery
                    </Link>
                  </li>
                  <li>
                    <Link href="/about" className="text-muted-foreground hover:text-foreground transition-colors">
                      About CCG 2026
                    </Link>
                  </li>
                  <li>
                    <Link href="/directions" className="text-muted-foreground hover:text-foreground transition-colors">
                      Directions
                    </Link>
                  </li>
                  <li>
                    <Link
                      href="/transparency"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                    >
                      Financial Transparency
                    </Link>
                  </li>
                </ul>
              </div>

              <div>
                <h3 className="font-semibold mb-4 text-sm">Community</h3>
                <ul className="space-y-2 text-sm">
                  <li>
                    <Link
                      href="https://t.me/+n5V_wDVKWrk1ZTBh"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                      target="_blank"
                      rel="noopener noreferrer"
                    >
                      Join the CCG26 Telegram
                    </Link>
                  </li>
                  <li>
                    <Link
                      href="https://t.me/+gZjhNaDswIc0ZDg0"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                      target="_blank"
                      rel="noopener noreferrer"
                    >
                      Join the Crypto Commons Association Telegram
                    </Link>
                  </li>
                </ul>
              </div>

              <div>
                <h3 className="font-semibold mb-4 text-sm">Partners</h3>
                <ul className="space-y-2 text-sm">
                  <li>
                    <Link
                      href="https://www.commons-hub.at/"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                      target="_blank"
                      rel="noopener noreferrer"
                    >
                      Commons Hub
                    </Link>
                  </li>
                  <li>
                    <Link
                      href="https://crypto-commons.org"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                      target="_blank"
                      rel="noopener noreferrer"
                    >
                      Crypto Commons Association
                    </Link>
                  </li>
                  <li>
                    <Link
                      href="/sponsorships"
                      className="text-muted-foreground hover:text-foreground transition-colors"
                    >
                      Sponsorships
                    </Link>
                  </li>
                </ul>
              </div>
            </div>

            <div className="pt-8 border-t border-border text-center text-sm text-muted-foreground">
              <p>This website is under Creative Commons license. Built with solidarity for the commons.</p>
            </div>
          </div>
        </footer>
      </div>
    )
  }

  return (
    <div className="min-h-screen bg-background">
      {/* Header */}
      <header className="border-b">
        <div className="container mx-auto px-4 py-4">
          <Link href="/" className="text-2xl font-bold text-primary">
            CCG
          </Link>
        </div>
      </header>

      <main className="container mx-auto px-4 py-12 max-w-3xl">
        <div className="text-center mb-12">
          <h1 className="text-4xl md:text-5xl font-bold mb-4">Register for CCG 2026</h1>
          <p className="text-xl text-muted-foreground">August 16-23, 2026 at the Commons Hub in Austria</p>
        </div>

        <Card>
          <CardHeader>
            <CardTitle>Registration Form</CardTitle>
            <CardDescription>Tell us about yourself and what you'd like to bring to CCG</CardDescription>
          </CardHeader>
          <CardContent>
            <form onSubmit={handleSubmit} className="space-y-6">
              {/* Name */}
              <div className="space-y-2">
                <Label htmlFor="name">What's your name? *</Label>
                <Input
                  id="name"
                  required
                  value={formData.name}
                  onChange={(e) => setFormData({ ...formData, name: e.target.value })}
                />
              </div>

              {/* Contact */}
              <div className="space-y-2">
                <Label htmlFor="contact">How can we contact you besides via email? *</Label>
                <Input
                  id="contact"
                  required
                  placeholder="Telegram, Signal, phone, etc."
                  value={formData.contact}
                  onChange={(e) => setFormData({ ...formData, contact: e.target.value })}
                />
              </div>

              {/* Contributions */}
              <div className="space-y-2">
                <Label htmlFor="contributions">What inputs do you want to contribute to CCG? *</Label>
                <Textarea
                  id="contributions"
                  required
                  placeholder="This could be a talk, workshop, research inquiry, prototype, game, performance, etc."
                  className="min-h-[120px]"
                  value={formData.contributions}
                  onChange={(e) => setFormData({ ...formData, contributions: e.target.value })}
                />
                <p className="text-sm text-muted-foreground">
                  This event is organized as an unconference, meaning that each participant is invited to co-create the
                  program.
                </p>
              </div>

              {/* Expectations */}
              <div className="space-y-2">
                <Label htmlFor="expectations">What do you expect to gain from participating? *</Label>
                <Textarea
                  id="expectations"
                  required
                  placeholder="What are you looking for in particular?"
                  className="min-h-[100px]"
                  value={formData.expectations}
                  onChange={(e) => setFormData({ ...formData, expectations: e.target.value })}
                />
              </div>

              {/* How heard */}
              <div className="space-y-2">
                <Label htmlFor="howHeard">How did you hear about CCG?</Label>
                <Input
                  id="howHeard"
                  placeholder="First timers: Did anyone recommend it to you?"
                  value={formData.howHeard}
                  onChange={(e) => setFormData({ ...formData, howHeard: e.target.value })}
                />
              </div>

              {/* Dietary Requirements */}
              <div className="space-y-3">
                <Label>Dietary Requirements</Label>
                <p className="text-sm text-muted-foreground">
                  Food will involve catering as well as self-prepared meals. Do you have any special dietary
                  requirements?
                </p>
                <div className="space-y-2">
                  {["vegetarian", "vegan", "gluten free", "lactose free"].map((diet) => (
                    <div key={diet} className="flex items-center space-x-2">
                      <Checkbox
                        id={diet}
                        checked={formData.dietary.includes(diet)}
                        onCheckedChange={(checked) => handleDietaryChange(diet, checked as boolean)}
                      />
                      <Label htmlFor={diet} className="font-normal cursor-pointer">
                        {diet.charAt(0).toUpperCase() + diet.slice(1)}
                      </Label>
                    </div>
                  ))}
                  <div className="flex items-start space-x-2 mt-2">
                    <Checkbox
                      id="other"
                      checked={!!formData.dietaryOther}
                      onCheckedChange={(checked) => {
                        if (!checked) setFormData({ ...formData, dietaryOther: "" })
                      }}
                    />
                    <div className="flex-1">
                      <Label htmlFor="other" className="font-normal cursor-pointer">
                        Other:
                      </Label>
                      <Input
                        id="dietaryOther"
                        className="mt-1"
                        placeholder="Please specify..."
                        value={formData.dietaryOther}
                        onChange={(e) => setFormData({ ...formData, dietaryOther: e.target.value })}
                      />
                    </div>
                  </div>
                </div>
              </div>

              {/* Commons Crews Consent */}
              <div className="space-y-3">
                <Label>Commons Crews Participation *</Label>
                <div className="bg-muted p-4 rounded-lg space-y-2 text-sm">
                  <p>
                    Part of the magic of CCG is that we consider the event a 'temporary commons' - we co-produce its
                    program as well as its leisure activities collectively.
                  </p>
                  <p>
                    This also involves joint care for the space and its maintenance needs, for emerging social and
                    emotional dynamics and for documentation of the sessions.
                  </p>
                  <p className="font-medium">
                    Besides active involvement in shaping the content of the event, you will be expected to contribute
                    to one or more 'commons crews' (kitchen, cleaning, documentation, facilitation, fire/water and
                    atmosphere).
                  </p>
                </div>
                <RadioGroup
                  required
                  value={formData.crewConsent}
                  onValueChange={(value) => setFormData({ ...formData, crewConsent: value })}
                >
                  <div className="flex items-center space-x-2">
                    <RadioGroupItem value="cant-wait" id="cant-wait" />
                    <Label htmlFor="cant-wait" className="font-normal cursor-pointer">
                      Can't wait
                    </Label>
                  </div>
                  <div className="flex items-center space-x-2">
                    <RadioGroupItem value="yes-please" id="yes-please" />
                    <Label htmlFor="yes-please" className="font-normal cursor-pointer">
                      Yes please gimme work!
                    </Label>
                  </div>
                  <div className="flex items-center space-x-2">
                    <RadioGroupItem value="love-it" id="love-it" />
                    <Label htmlFor="love-it" className="font-normal cursor-pointer">
                      I love getting my hands dirty :D
                    </Label>
                  </div>
                </RadioGroup>
              </div>

              <div className="pt-4">
                <Button type="submit" className="w-full" size="lg" disabled={isSubmitting}>
                  {isSubmitting ? "Recording registration..." : "Continue to Payment"}
                </Button>
              </div>

              <div className="text-sm text-muted-foreground text-center">
                <p>
                  Questions? Contact us on{" "}
                  <a href="https://t.me/+Bc48A-mqvmY3MmE0" className="text-primary hover:underline">
                    Telegram
                  </a>
                </p>
              </div>
            </form>
          </CardContent>
        </Card>
      </main>

      {/* Footer */}
      <footer className="py-12 px-4 border-t border-border">
        <div className="container mx-auto max-w-6xl">
          <div className="grid sm:grid-cols-2 md:grid-cols-4 gap-8 mb-8">
            <div>
              <h3 className="font-bold mb-4">CCG 2026</h3>
              <p className="text-sm text-muted-foreground">
                Crypto Commons Gathering
                <br />
                August 16-23, 2026
              </p>
            </div>

            <div>
              <h3 className="font-semibold mb-4 text-sm">Links</h3>
              <ul className="space-y-2 text-sm">
                <li>
                  <Link href="/register" className="text-muted-foreground hover:text-foreground transition-colors">
                    Register to Attend
                  </Link>
                </li>
                <li>
                  <Link href="/gallery" className="text-muted-foreground hover:text-foreground transition-colors">
                    Gallery
                  </Link>
                </li>
                <li>
                  <Link href="/about" className="text-muted-foreground hover:text-foreground transition-colors">
                    About CCG 2026
                  </Link>
                </li>
                <li>
                  <Link href="/directions" className="text-muted-foreground hover:text-foreground transition-colors">
                    Directions
                  </Link>
                </li>
                <li>
                  <Link href="/transparency" className="text-muted-foreground hover:text-foreground transition-colors">
                    Financial Transparency
                  </Link>
                </li>
              </ul>
            </div>

            <div>
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