import { useState } from "react";
import { useApp } from "../context/AppContext.jsx";
import { RED } from "../constants/index.js";


function initials(naam = "") {
  const parts = naam.trim().split(/\s+/);
  if (parts.length >= 2) return (parts[0][0] + parts[parts.length - 1][0]).toUpperCase();
  return naam.slice(0, 2).toUpperCase();
}

const LOCK_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <rect x="3" y="7" width="10" height="8" rx="2" stroke="currentColor" strokeWidth="1.5"/>
    <path d="M5 7V5a3 3 0 016 0v2" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
  </svg>
);

const LOGOUT_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <path d="M6 2H3a1 1 0 00-1 1v10a1 1 0 001 1h3" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
    <polyline points="10,5 13,8 10,11" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
    <line x1="13" y1="8" x2="6" y2="8" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
  </svg>
);

const CHEVRON = (
  <svg width="14" height="14" viewBox="0 0 14 14" fill="none">
    <polyline points="5,3 9,7 5,11" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
  </svg>
);

const BACK_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <polyline points="10,3 6,8 10,13" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
  </svg>
);

function InputField({ label, type = "text", value, onChange, T }) {
  return (
    <div>
      <label style={{ fontSize: 11, color: T.muted, fontWeight: 600, display: "block", marginBottom: 5, textTransform: "uppercase", letterSpacing: "0.06em" }}>{label}</label>
      <input type={type} value={value} onChange={onChange} style={{
        width: "100%", padding: "10px 12px", borderRadius: 10, fontSize: 13,
        background: T.bg, border: `1px solid ${T.border}`, color: T.text, outline: "none",
      }} />
    </div>
  );
}

export default function ProfielPopup({ onClose }) {
  const { currentUser, updateProfile, changePassword, logout, T, avatar, setAvatar } = useApp();

  const [view, setView] = useState("main");

  const [naam,  setNaam]  = useState(currentUser?.naam  || "");
  const [email, setEmail] = useState(currentUser?.email || "");
  const [profielErr, setProfielErr] = useState("");
  const [profielOk,  setProfielOk]  = useState(false);
  const [profielBusy, setProfielBusy] = useState(false);

  const [huidig,   setHuidig]   = useState("");
  const [nieuw,    setNieuw]    = useState("");
  const [bevestig, setBevestig] = useState("");
  const [pwErr,    setPwErr]    = useState("");
  const [pwOk,     setPwOk]     = useState(false);
  const [pwBusy,   setPwBusy]   = useState(false);

  const saveProfiel = async () => {
    setProfielErr(""); setProfielOk(false);
    if (!naam.trim() || !email.trim()) { setProfielErr("Naam en e-mail zijn verplicht."); return; }
    setProfielBusy(true);
    try { await updateProfile(naam.trim(), email.trim()); setProfielOk(true); }
    catch (err) { setProfielErr(err.message || "Opslaan mislukt."); }
    finally { setProfielBusy(false); }
  };

  const saveWachtwoord = async () => {
    setPwErr(""); setPwOk(false);
    if (!huidig || !nieuw || !bevestig) { setPwErr("Vul alle velden in."); return; }
    if (nieuw !== bevestig) { setPwErr("Nieuwe wachtwoorden komen niet overeen."); return; }
    if (nieuw.length < 8) { setPwErr("Minimaal 8 tekens."); return; }
    setPwBusy(true);
    try { await changePassword(huidig, nieuw); setPwOk(true); setHuidig(""); setNieuw(""); setBevestig(""); }
    catch (err) { setPwErr(err.message || "Wijzigen mislukt."); }
    finally { setPwBusy(false); }
  };

  const popupStyle = {
    position: "fixed", top: 64, right: 16, zIndex: 199,
    background: T.popupBg,
    border: `1px solid ${T.border}`,
    borderRadius: 16, width: 340,
    boxShadow: "0 16px 48px rgba(0,0,0,0.45)",
    overflow: "hidden",
  };

  const headerStyle = {
    display: "flex", alignItems: "center", justifyContent: "center",
    padding: "16px 16px 14px", position: "relative",
    borderBottom: `1px solid ${T.border}`,
  };

  const closeBtn = (
    <button onClick={onClose} style={{
      position: "absolute", right: 14, top: "50%", transform: "translateY(-50%)",
      background: "transparent", border: "none", cursor: "pointer",
      color: T.muted, fontSize: 20, lineHeight: 1, padding: 4,
    }}>×</button>
  );

  const backBtn = (label) => (
    <button onClick={() => setView("main")} style={{
      position: "absolute", left: 12, top: "50%", transform: "translateY(-50%)",
      background: "transparent", border: "none", cursor: "pointer",
      color: T.muted, display: "flex", alignItems: "center", padding: 4,
    }}>{BACK_ICON}</button>
  );

  const actionRow = (icon, label, onClick, color) => (
    <div onClick={onClick} style={{
      display: "flex", alignItems: "center", gap: 12,
      padding: "14px 18px", cursor: "pointer",
      color: color || T.text,
    }}>
      <span style={{ color: color || T.muted, display: "flex" }}>{icon}</span>
      <span style={{ flex: 1, fontWeight: 600, fontSize: 14 }}>{label}</span>
      {!color && <span style={{ color: T.muted, display: "flex" }}>{CHEVRON}</span>}
    </div>
  );

  return (
    <>
      <div onClick={onClose} style={{ position: "fixed", inset: 0, zIndex: 198 }} />

      <div style={popupStyle}>

        {/* ── Hoofdscherm ── */}
        {view === "main" && (
          <>
            <div style={headerStyle}>
              <span style={{ fontWeight: 700, fontSize: 15, color: T.text }}>Mijn account</span>
              {closeBtn}
            </div>

            {/* Avatar + naam + email */}
            <div style={{ display: "flex", flexDirection: "column", alignItems: "center", padding: "24px 18px 20px", gap: 6 }}>
              <div style={{
                width: 72, height: 72, borderRadius: "50%", overflow: "hidden",
                background: avatar ? "transparent" : T.accentGradient,
                display: "flex", alignItems: "center", justifyContent: "center",
                fontSize: 24, fontWeight: 800, color: "#fff",
                boxShadow: "0 0 20px rgba(124,58,237,0.4)", marginBottom: 4,
              }}>
                {avatar
                  ? <img src={avatar} alt="avatar" style={{ width: "100%", height: "100%", objectFit: "cover" }} />
                  : initials(currentUser?.naam)
                }
              </div>
              <div style={{ fontWeight: 700, fontSize: 16, color: T.text }}>{currentUser?.naam}</div>
              <div style={{ fontSize: 13, color: T.muted }}>{currentUser?.email}</div>
              <button onClick={() => setView("profiel")} style={{
                marginTop: 8, padding: "9px 24px",
                background: T.accentGradient,
                border: "none", borderRadius: 10, color: "#fff",
                fontWeight: 700, fontSize: 13, cursor: "pointer",
                boxShadow: T.cardShadow,
              }}>Profiel bewerken</button>
            </div>

            <div style={{ height: 1, background: T.border }} />
            {actionRow(LOCK_ICON, "Wachtwoord wijzigen", () => setView("wachtwoord"))}
          </>
        )}

        {/* ── Profiel bewerken ── */}
        {view === "profiel" && (
          <>
            <div style={headerStyle}>
              {backBtn()}
              <span style={{ fontWeight: 700, fontSize: 15, color: T.text }}>Profiel bewerken</span>
              {closeBtn}
            </div>
            <div style={{ padding: "20px 18px", display: "flex", flexDirection: "column", gap: 14 }}>
              {/* Avatar — klikbaar om foto te uploaden */}
              <div style={{ display: "flex", justifyContent: "center", marginBottom: 4 }}>
                <label style={{ cursor: "pointer", position: "relative", display: "block" }} title="Klik om foto te uploaden">
                  <div style={{
                    width: 64, height: 64, borderRadius: "50%", overflow: "hidden",
                    background: avatar ? "transparent" : T.accentGradient,
                    display: "flex", alignItems: "center", justifyContent: "center",
                    fontSize: 20, fontWeight: 800, color: "#fff",
                  }}>
                    {avatar
                      ? <img src={avatar} alt="avatar" style={{ width: "100%", height: "100%", objectFit: "cover" }} />
                      : initials(currentUser?.naam)
                    }
                  </div>
                  <div style={{
                    position: "absolute", inset: 0, borderRadius: "50%",
                    background: "rgba(0,0,0,0.35)", display: "flex", alignItems: "center", justifyContent: "center",
                    opacity: 0, transition: "opacity 0.15s",
                  }} className="avatar-overlay">
                    <svg width="20" height="20" viewBox="0 0 20 20" fill="none">
                      <path d="M13 3H7L5 6H2a1 1 0 00-1 1v9a1 1 0 001 1h16a1 1 0 001-1V7a1 1 0 00-1-1h-3L13 3z" stroke="#fff" strokeWidth="1.5" strokeLinejoin="round"/>
                      <circle cx="10" cy="11" r="2.5" stroke="#fff" strokeWidth="1.5"/>
                    </svg>
                  </div>
                  <input type="file" accept="image/*" style={{ display: "none" }} onChange={(e) => {
                    const file = e.target.files?.[0]; if (!file) return;
                    const reader = new FileReader();
                    reader.onload = (ev) => setAvatar(ev.target.result);
                    reader.readAsDataURL(file);
                  }} />
                </label>
              </div>
              <style>{`.avatar-overlay { opacity: 0 !important; } label:hover .avatar-overlay { opacity: 1 !important; }`}</style>
              {avatar && (
                <button onClick={() => setAvatar(null)} style={{
                  alignSelf: "center", padding: "4px 12px", background: "transparent",
                  border: `1px solid ${T.border}`, borderRadius: 8,
                  color: T.muted, fontSize: 12, fontWeight: 600, cursor: "pointer",
                }}>Foto verwijderen</button>
              )}
              <InputField label="Naam"   value={naam}  onChange={(e) => { setNaam(e.target.value);  setProfielOk(false); }} T={T} />
              <InputField label="E-mail" type="email" value={email} onChange={(e) => { setEmail(e.target.value); setProfielOk(false); }} T={T} />
              {profielErr && <div style={{ fontSize: 12, color: RED }}>{profielErr}</div>}
              {profielOk  && <div style={{ fontSize: 12, color: "#10b981" }}>Profiel opgeslagen.</div>}
              <button onClick={saveProfiel} disabled={profielBusy} style={{
                padding: "11px", background: T.accentGradient,
                border: "none", borderRadius: 10, color: "#fff", fontWeight: 700,
                fontSize: 13, cursor: profielBusy ? "default" : "pointer", opacity: profielBusy ? 0.7 : 1,
              }}>{profielBusy ? "Opslaan…" : "Opslaan"}</button>
            </div>
          </>
        )}

        {/* ── Wachtwoord wijzigen ── */}
        {view === "wachtwoord" && (
          <>
            <div style={headerStyle}>
              {backBtn()}
              <span style={{ fontWeight: 700, fontSize: 15, color: T.text }}>Wachtwoord wijzigen</span>
              {closeBtn}
            </div>
            <div style={{ padding: "20px 18px", display: "flex", flexDirection: "column", gap: 14 }}>
              <InputField label="Huidig wachtwoord" type="password" value={huidig}   onChange={(e) => { setHuidig(e.target.value);   setPwOk(false); }} T={T} />
              <InputField label="Nieuw wachtwoord"  type="password" value={nieuw}    onChange={(e) => { setNieuw(e.target.value);    setPwOk(false); }} T={T} />
              <InputField label="Bevestig nieuw"    type="password" value={bevestig} onChange={(e) => { setBevestig(e.target.value); setPwOk(false); }} T={T} />
              {pwErr && <div style={{ fontSize: 12, color: RED }}>{pwErr}</div>}
              {pwOk  && <div style={{ fontSize: 12, color: "#10b981" }}>Wachtwoord gewijzigd.</div>}
              <button onClick={saveWachtwoord} disabled={pwBusy} style={{
                padding: "11px", background: T.accentGradient,
                border: "none", borderRadius: 10, color: "#fff", fontWeight: 700,
                fontSize: 13, cursor: pwBusy ? "default" : "pointer", opacity: pwBusy ? 0.7 : 1,
              }}>{pwBusy ? "Opslaan…" : "Opslaan"}</button>
            </div>
          </>
        )}

      </div>
    </>
  );
}