"use client"

// Kontoinnstillinger (ADR-021): sett/fjern passord (valgfritt tillegg til
// magic-link), aktiver/deaktiver 2FA. Frivillig 2FA-oppsett herfra bruker
// SAMME TwoFactorSetupForm som den tvungne flyten rett etter innlogging
// (forced=false her -- kun tekst-copyen skiller de to).

import type React from "react"
import { useEffect, useRef, useState } from "react"
import Link from "next/link"
import { ArrowLeft, Camera, KeyRound, Lock, Mail, ShieldCheck, ShieldOff, User, X } from "lucide-react"
import { Button } from "@/components/ui/button"
import { Input } from "@/components/ui/input"
import { Label } from "@/components/ui/label"
import { TwoFactorSetupForm } from "@/components/two-factor-flow"

// ADR-031: personlig profil, ETT sett per konto (app_user), atskilt fra de
// org-scopede `player`-radene organisatorer administrerer.
type Me = {
  id: string
  email: string
  display_name: string
  has_password: boolean
  two_factor_method: "totp" | "email" | null
  first_name: string | null
  last_name: string | null
  birth_date: string | null
  gender: "m" | "f" | "x" | null
  handicap_index: number | null
  home_club: string | null
  mobile_country_code: string | null
  mobile_number: string | null
  avatar_url: string | null
}

export function AccountSettings() {
  const [me, setMe] = useState<Me | null>(null)
  const [loading, setLoading] = useState(true)
  const [settingUp2fa, setSettingUp2fa] = useState(false)

  async function loadMe() {
    try {
      const res = await fetch("/auth/me", { credentials: "include" })
      if (res.ok) setMe(await res.json())
    } finally {
      setLoading(false)
    }
  }

  useEffect(() => {
    void loadMe()
  }, [])

  async function handleDisable2fa() {
    if (!confirm("Er du sikker på at du vil slå av topartsautentisering?")) return
    const res = await fetch("/auth/2fa/disable", { method: "POST", credentials: "include" })
    if (res.ok) void loadMe()
  }

  if (loading) {
    return (
      <div className="flex min-h-[100dvh] flex-col items-center justify-center bg-background">
        <div
          aria-hidden="true"
          className="size-10 animate-spin rounded-full border-4 border-primary/20 border-t-primary"
        />
      </div>
    )
  }

  if (!me) return null

  return (
    <div className="flex min-h-[100dvh] flex-col bg-background">
      <header className="sticky top-0 z-10 border-b border-border bg-background/80 backdrop-blur">
        <div className="mx-auto flex w-full max-w-2xl items-center gap-3 px-5 py-4">
          <Link
            href="/dashboard"
            aria-label="Tilbake til dashbord"
            className="flex size-10 shrink-0 items-center justify-center rounded-xl border border-border bg-card text-muted-foreground transition-colors hover:bg-accent/50 hover:text-foreground"
          >
            <ArrowLeft aria-hidden="true" className="size-5" />
          </Link>
          <div className="flex min-w-0 flex-col">
            <span className="text-xs font-semibold uppercase tracking-wide text-muted-foreground">Konto</span>
            <h1 className="truncate text-xl font-extrabold tracking-tight text-foreground">{me.email}</h1>
          </div>
        </div>
      </header>

      <main className="mx-auto w-full max-w-2xl flex-1 px-5 py-6 sm:py-8">
        {settingUp2fa ? (
          <div className="rounded-3xl border border-border bg-card p-6 shadow-sm shadow-black/5 sm:p-8">
            <TwoFactorSetupForm
              forced={false}
              onSuccess={() => {
                setSettingUp2fa(false)
                void loadMe()
              }}
            />
          </div>
        ) : (
          <div className="flex flex-col gap-6">
            <ProfileSection me={me} onChanged={loadMe} />

            <EmailSection email={me.email} />

            <PasswordSection hasPassword={me.has_password} onChanged={loadMe} />

            <section className="flex flex-col gap-3 rounded-3xl border border-border bg-card p-5 shadow-sm shadow-black/5 sm:p-6">
              <div className="flex items-center gap-2.5">
                <div className="flex size-10 items-center justify-center rounded-xl bg-primary/15">
                  <ShieldCheck aria-hidden="true" className="size-5 text-primary" />
                </div>
                <h2 className="text-base font-bold text-foreground">Topartsautentisering (2FA)</h2>
              </div>

              {me.two_factor_method ? (
                <>
                  <p className="text-sm leading-relaxed text-muted-foreground text-pretty">
                    Aktivert med{" "}
                    <span className="font-semibold text-foreground">
                      {me.two_factor_method === "totp" ? "autentisator-app" : "engangskode på e-post"}
                    </span>
                    .
                  </p>
                  <Button
                    type="button"
                    variant="outline"
                    onClick={handleDisable2fa}
                    className="h-12 w-fit rounded-2xl font-semibold text-destructive hover:text-destructive"
                  >
                    <ShieldOff aria-hidden="true" className="size-4" />
                    Slå av 2FA
                  </Button>
                </>
              ) : (
                <>
                  <p className="text-sm leading-relaxed text-muted-foreground text-pretty">
                    Ikke aktivert. Anbefales for organisasjonseiere/administratorer -- da vil du
                    bli bedt om å sette det opp ved neste innlogging uansett.
                  </p>
                  <Button
                    type="button"
                    onClick={() => setSettingUp2fa(true)}
                    className="h-12 w-fit rounded-2xl font-semibold"
                  >
                    <KeyRound aria-hidden="true" className="size-4" />
                    Sett opp 2FA
                  </Button>
                </>
              )}
            </section>
          </div>
        )}
      </main>
    </div>
  )
}

// --- Personlig profil (ADR-031) ---------------------------------------------

function ProfileSection({ me, onChanged }: { me: Me; onChanged: () => void }) {
  const [firstName, setFirstName] = useState(me.first_name ?? "")
  const [lastName, setLastName] = useState(me.last_name ?? "")
  const [birthDate, setBirthDate] = useState(me.birth_date ?? "")
  const [gender, setGender] = useState(me.gender ?? "")
  const [hcp, setHcp] = useState(me.handicap_index === null ? "" : String(me.handicap_index))
  const [homeClub, setHomeClub] = useState(me.home_club ?? "")
  const [mobileCountryCode, setMobileCountryCode] = useState(me.mobile_country_code ?? "+47")
  const [mobileNumber, setMobileNumber] = useState(me.mobile_number ?? "")
  const [saving, setSaving] = useState(false)
  const [uploadingAvatar, setUploadingAvatar] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [success, setSuccess] = useState(false)
  const fileInputRef = useRef<HTMLInputElement>(null)

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setSaving(true)
    setError(null)
    setSuccess(false)
    try {
      const res = await fetch("/auth/profile", {
        method: "PATCH",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({
          first_name: firstName.trim() === "" ? null : firstName.trim(),
          last_name: lastName.trim() === "" ? null : lastName.trim(),
          birth_date: birthDate === "" ? null : birthDate,
          gender: gender === "" ? null : gender,
          handicap_index: hcp.trim() === "" ? null : Number(hcp.replace(",", ".")),
          home_club: homeClub.trim() === "" ? null : homeClub.trim(),
          mobile_country_code: mobileNumber.trim() === "" ? null : mobileCountryCode.trim(),
          mobile_number: mobileNumber.trim() === "" ? null : mobileNumber.trim(),
        }),
      })
      if (!res.ok) {
        const body = await res.json().catch(() => null)
        throw new Error(body?.detail?.message ?? "Klarte ikke å lagre profilen.")
      }
      setSuccess(true)
      onChanged()
    } catch (err) {
      setError(err instanceof Error ? err.message : "Noe gikk galt. Prøv igjen.")
    } finally {
      setSaving(false)
    }
  }

  async function handleAvatarSelected(e: React.ChangeEvent<HTMLInputElement>) {
    const file = e.target.files?.[0]
    if (!file) return
    setUploadingAvatar(true)
    setError(null)
    try {
      const formData = new FormData()
      formData.append("file", file)
      const res = await fetch("/auth/profile/avatar", {
        method: "POST",
        credentials: "include",
        body: formData,
      })
      if (!res.ok) throw new Error("Klarte ikke å laste opp profilbildet.")
      onChanged()
    } catch (err) {
      setError(err instanceof Error ? err.message : "Klarte ikke å laste opp profilbildet.")
    } finally {
      setUploadingAvatar(false)
      if (fileInputRef.current) fileInputRef.current.value = ""
    }
  }

  async function handleRemoveAvatar() {
    setUploadingAvatar(true)
    try {
      const res = await fetch("/auth/profile/avatar", { method: "DELETE", credentials: "include" })
      if (res.ok) onChanged()
    } finally {
      setUploadingAvatar(false)
    }
  }

  return (
    <section className="flex flex-col gap-4 rounded-3xl border border-border bg-card p-5 shadow-sm shadow-black/5 sm:p-6">
      <div className="flex items-center gap-2.5">
        <div className="flex size-10 items-center justify-center rounded-xl bg-primary/15">
          <User aria-hidden="true" className="size-5 text-primary" />
        </div>
        <h2 className="text-base font-bold text-foreground">Personlig profil</h2>
      </div>

      <div className="flex items-center gap-4">
        <div className="relative flex size-16 shrink-0 items-center justify-center overflow-hidden rounded-full bg-secondary">
          {me.avatar_url ? (
            // eslint-disable-next-line @next/next/no-img-element
            <img src={me.avatar_url} alt="" className="size-full object-cover" />
          ) : (
            <User aria-hidden="true" className="size-7 text-muted-foreground" />
          )}
        </div>
        <div className="flex flex-col gap-1.5">
          <input
            ref={fileInputRef}
            type="file"
            accept="image/jpeg,image/png,image/webp,image/gif"
            className="hidden"
            onChange={handleAvatarSelected}
          />
          <Button
            type="button"
            variant="outline"
            size="sm"
            disabled={uploadingAvatar}
            onClick={() => fileInputRef.current?.click()}
            className="h-9 rounded-xl font-semibold"
          >
            <Camera aria-hidden="true" className="size-4" />
            {me.avatar_url ? "Bytt bilde" : "Last opp bilde"}
          </Button>
          {me.avatar_url && (
            <button
              type="button"
              onClick={handleRemoveAvatar}
              disabled={uploadingAvatar}
              className="inline-flex w-fit items-center gap-1 text-xs font-semibold text-muted-foreground transition-colors hover:text-destructive"
            >
              <X aria-hidden="true" className="size-3" />
              Fjern bilde
            </button>
          )}
        </div>
      </div>

      <form onSubmit={handleSubmit} className="flex flex-col gap-3">
        <div className="grid grid-cols-1 gap-3 sm:grid-cols-2">
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="first-name" className="text-sm font-semibold">
              Fornavn
            </Label>
            <Input
              id="first-name"
              value={firstName}
              onChange={(e) => setFirstName(e.target.value)}
              className="h-11 rounded-xl"
            />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="last-name" className="text-sm font-semibold">
              Etternavn
            </Label>
            <Input
              id="last-name"
              value={lastName}
              onChange={(e) => setLastName(e.target.value)}
              className="h-11 rounded-xl"
            />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="birth-date" className="text-sm font-semibold">
              Fødselsdato
            </Label>
            <Input
              id="birth-date"
              type="date"
              value={birthDate}
              onChange={(e) => setBirthDate(e.target.value)}
              className="h-11 rounded-xl"
            />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="gender" className="text-sm font-semibold">
              Kjønn
            </Label>
            <select
              id="gender"
              value={gender}
              onChange={(e) => setGender(e.target.value)}
              className="h-11 rounded-xl border border-border bg-card px-3 text-sm font-medium text-foreground outline-none"
            >
              <option value="">Ikke satt</option>
              <option value="f">Dame</option>
              <option value="m">Herre</option>
              <option value="x">Annet</option>
            </select>
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="hcp" className="text-sm font-semibold">
              HCP
            </Label>
            <Input
              id="hcp"
              inputMode="decimal"
              value={hcp}
              onChange={(e) => setHcp(e.target.value)}
              className="h-11 rounded-xl"
            />
          </div>
          <div className="flex flex-col gap-1.5">
            <Label htmlFor="home-club" className="text-sm font-semibold">
              Hjemmeklubb
            </Label>
            <Input
              id="home-club"
              value={homeClub}
              onChange={(e) => setHomeClub(e.target.value)}
              className="h-11 rounded-xl"
            />
          </div>
          <div className="flex flex-col gap-1.5 sm:col-span-2">
            <Label htmlFor="mobile-number" className="text-sm font-semibold">
              Mobil
            </Label>
            <div className="flex gap-2">
              <Input
                id="mobile-country-code"
                aria-label="Landsnummer"
                value={mobileCountryCode}
                onChange={(e) => setMobileCountryCode(e.target.value)}
                placeholder="+47"
                className="h-11 w-20 shrink-0 rounded-xl text-center"
              />
              <Input
                id="mobile-number"
                type="tel"
                value={mobileNumber}
                onChange={(e) => setMobileNumber(e.target.value)}
                placeholder="912 34 567"
                className="h-11 flex-1 rounded-xl"
              />
            </div>
          </div>
        </div>

        {error && <p className="text-sm font-medium text-destructive">{error}</p>}
        {success && <p className="text-sm font-medium text-primary">Profilen er oppdatert.</p>}

        <Button type="submit" disabled={saving} className="h-11 w-fit rounded-xl font-semibold">
          {saving ? "Lagrer …" : "Lagre profil"}
        </Button>
      </form>
    </section>
  )
}

// --- E-post (identifikatoren) -----------------------------------------------
// Bevisst IKKE en del av ProfileSection sin vanlige PATCH -- e-post er
// innloggings-identifikatoren, endring krever at den NYE adressen beviser
// eierskap først (se app/routers/auth.py sin request_email_change/
// confirm_email_change).

function EmailSection({ email }: { email: string }) {
  const [editing, setEditing] = useState(false)
  const [newEmail, setNewEmail] = useState("")
  const [submitting, setSubmitting] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [sent, setSent] = useState(false)

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    setSubmitting(true)
    setError(null)
    try {
      const res = await fetch("/auth/profile/email", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({ new_email: newEmail.trim() }),
      })
      if (!res.ok) {
        const body = await res.json().catch(() => null)
        throw new Error(body?.detail?.message ?? "Klarte ikke å sende bekreftelseslenken.")
      }
      setSent(true)
    } catch (err) {
      setError(err instanceof Error ? err.message : "Noe gikk galt. Prøv igjen.")
    } finally {
      setSubmitting(false)
    }
  }

  return (
    <section className="flex flex-col gap-3 rounded-3xl border border-border bg-card p-5 shadow-sm shadow-black/5 sm:p-6">
      <div className="flex items-center gap-2.5">
        <div className="flex size-10 items-center justify-center rounded-xl bg-primary/15">
          <Mail aria-hidden="true" className="size-5 text-primary" />
        </div>
        <h2 className="text-base font-bold text-foreground">E-post</h2>
      </div>

      <p className="text-sm leading-relaxed text-muted-foreground text-pretty">
        Dette er identifikatoren du logger inn med: <span className="font-semibold text-foreground">{email}</span>
      </p>

      {sent ? (
        <p className="text-sm font-medium text-primary text-pretty">
          Sjekk innboksen til {newEmail.trim()} — åpne lenken der for å fullføre byttet. Adressen
          endres ikke før den er bekreftet.
        </p>
      ) : editing ? (
        <form onSubmit={handleSubmit} className="flex flex-col gap-3 sm:flex-row sm:items-end">
          <div className="flex flex-1 flex-col gap-1.5">
            <Label htmlFor="new-email" className="text-sm font-semibold">
              Ny e-postadresse
            </Label>
            <Input
              id="new-email"
              type="email"
              autoFocus
              value={newEmail}
              onChange={(e) => setNewEmail(e.target.value)}
              className="h-12 rounded-xl"
            />
          </div>
          <div className="flex gap-2">
            <Button
              type="submit"
              disabled={submitting || newEmail.trim() === ""}
              className="h-12 shrink-0 rounded-xl font-semibold"
            >
              {submitting ? "Sender …" : "Send bekreftelse"}
            </Button>
            <Button
              type="button"
              variant="ghost"
              onClick={() => setEditing(false)}
              className="h-12 shrink-0 rounded-xl font-semibold"
            >
              Avbryt
            </Button>
          </div>
        </form>
      ) : (
        <Button
          type="button"
          variant="outline"
          onClick={() => setEditing(true)}
          className="h-11 w-fit rounded-xl font-semibold"
        >
          Endre e-post
        </Button>
      )}

      {error && <p className="text-sm font-medium text-destructive">{error}</p>}
    </section>
  )
}

function PasswordSection({ hasPassword, onChanged }: { hasPassword: boolean; onChanged: () => void }) {
  const [password, setPassword] = useState("")
  const [submitting, setSubmitting] = useState(false)
  const [error, setError] = useState<string | null>(null)
  const [success, setSuccess] = useState(false)

  async function handleSubmit(e: React.FormEvent) {
    e.preventDefault()
    if (password.length < 8 || submitting) return
    setSubmitting(true)
    setError(null)
    setSuccess(false)
    try {
      const res = await fetch("/auth/set-password", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        credentials: "include",
        body: JSON.stringify({ password }),
      })
      if (!res.ok) {
        const body = await res.json().catch(() => null)
        throw new Error(body?.detail?.message ?? "Klarte ikke å sette passordet.")
      }
      setPassword("")
      setSuccess(true)
      onChanged()
    } catch (err) {
      setError(err instanceof Error ? err.message : "Noe gikk galt. Prøv igjen.")
    } finally {
      setSubmitting(false)
    }
  }

  async function handleRemove() {
    if (!confirm("Fjerne passordet? Du kan fortsatt logge inn med magic-link.")) return
    const res = await fetch("/auth/remove-password", { method: "POST", credentials: "include" })
    if (res.ok) onChanged()
  }

  return (
    <section className="flex flex-col gap-4 rounded-3xl border border-border bg-card p-5 shadow-sm shadow-black/5 sm:p-6">
      <div className="flex items-center gap-2.5">
        <div className="flex size-10 items-center justify-center rounded-xl bg-primary/15">
          <Lock aria-hidden="true" className="size-5 text-primary" />
        </div>
        <h2 className="text-base font-bold text-foreground">Passord</h2>
      </div>

      <p className="text-sm leading-relaxed text-muted-foreground text-pretty">
        {hasPassword
          ? "Du har et passord satt. Du kan fortsatt logge inn med magic-link når som helst."
          : "Ikke satt -- du logger i dag kun inn med magic-link. Passord er et valgfritt tillegg, aldri påkrevd."}
      </p>

      <form onSubmit={handleSubmit} className="flex flex-col gap-3 sm:flex-row sm:items-end">
        <div className="flex flex-1 flex-col gap-1.5">
          <Label htmlFor="new-password" className="text-sm font-semibold">
            {hasPassword ? "Nytt passord" : "Sett et passord"}
          </Label>
          <Input
            id="new-password"
            type="password"
            autoComplete="new-password"
            placeholder="Minst 8 tegn"
            value={password}
            onChange={(e) => setPassword(e.target.value)}
            className="h-12 rounded-xl"
          />
        </div>
        <Button
          type="submit"
          disabled={password.length < 8 || submitting}
          className="h-12 shrink-0 rounded-xl font-semibold"
        >
          {submitting ? "Lagrer …" : hasPassword ? "Bytt passord" : "Sett passord"}
        </Button>
      </form>

      {error && <p className="text-sm font-medium text-destructive">{error}</p>}
      {success && <p className="text-sm font-medium text-primary">Passordet er oppdatert.</p>}

      {hasPassword && (
        <button
          type="button"
          onClick={handleRemove}
          className="w-fit text-sm font-semibold text-muted-foreground transition-colors hover:text-destructive"
        >
          Fjern passordet
        </button>
      )}
    </section>
  )
}