import { useState } from "react";
import { TABS } from "../constants/index.js";
import { version } from "../version.js";
import { useUpdateCheck } from "../hooks/useUpdateCheck.js";
import { useApp } from "../context/AppContext.jsx";

const TAB_ICONS = [
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <rect x="1" y="1" width="6" height="6" rx="1.5" stroke="currentColor" strokeWidth="1.5"/>
    <rect x="9" y="1" width="6" height="6" rx="1.5" stroke="currentColor" strokeWidth="1.5"/>
    <rect x="1" y="9" width="6" height="6" rx="1.5" stroke="currentColor" strokeWidth="1.5"/>
    <rect x="9" y="9" width="6" height="6" rx="1.5" stroke="currentColor" strokeWidth="1.5"/>
  </svg>,
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <polyline points="1,12 5,7 8,10 11,4 15,6" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round" strokeLinecap="round"/>
    <polyline points="11,4 15,4 15,8" stroke="currentColor" strokeWidth="1.5" strokeLinejoin="round" strokeLinecap="round"/>
  </svg>,
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <rect x="1" y="3" width="14" height="10" rx="2" stroke="currentColor" strokeWidth="1.5"/>
    <line x1="1" y1="6.5" x2="15" y2="6.5" stroke="currentColor" strokeWidth="1.5"/>
    <line x1="3" y1="10" x2="6" y2="10" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
  </svg>,
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <rect x="1.5" y="8" width="3" height="6" rx="1" fill="currentColor"/>
    <rect x="6.5" y="5" width="3" height="9" rx="1" fill="currentColor"/>
    <rect x="11.5" y="2" width="3" height="12" rx="1" fill="currentColor"/>
  </svg>,
];

const GEBRUIKERS_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <circle cx="6" cy="5" r="2.5" stroke="currentColor" strokeWidth="1.5"/>
    <path d="M1 13c0-2.5 2-4 5-4s5 1.5 5 4" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
    <circle cx="12.5" cy="5" r="2" stroke="currentColor" strokeWidth="1.4"/>
    <path d="M14.5 13c0-1.5-.8-2.7-2-3.3" stroke="currentColor" strokeWidth="1.4" strokeLinecap="round"/>
  </svg>
);

const INSTELLINGEN_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="currentColor">
    <path fillRule="evenodd" clipRule="evenodd" d="M6.5 1a.75.75 0 0 0-.743.648l-.16 1.112a5.07 5.07 0 0 0-.88.51l-1.054-.424a.75.75 0 0 0-.9.31L1.263 4.95a.75.75 0 0 0 .165.96l.888.717a5.14 5.14 0 0 0 0 1.018l-.888.717a.75.75 0 0 0-.165.96l1.5 2.598a.75.75 0 0 0 .9.31l1.053-.424c.276.19.572.36.881.51l.16 1.112A.75.75 0 0 0 6.5 14h3a.75.75 0 0 0 .743-.648l.16-1.112c.309-.15.605-.32.88-.51l1.054.424a.75.75 0 0 0 .9-.31l1.5-2.598a.75.75 0 0 0-.165-.96l-.888-.717a5.14 5.14 0 0 0 0-1.018l.888-.717a.75.75 0 0 0 .165-.96l-1.5-2.598a.75.75 0 0 0-.9-.31l-1.053.424a5.07 5.07 0 0 0-.881-.51L9.743 1.648A.75.75 0 0 0 9.5 1h-3Zm1.5 4.5a2.5 2.5 0 1 0 0 5 2.5 2.5 0 0 0 0-5Z"/>
  </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 INFO_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <circle cx="8" cy="8" r="6.5" stroke="currentColor" strokeWidth="1.5"/>
    <line x1="8" y1="7" x2="8" y2="11.5" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round"/>
    <circle cx="8" cy="4.5" r="0.8" fill="currentColor"/>
  </svg>
);

const MOON_ICON = (
  <svg width="16" height="16" viewBox="0 0 16 16" fill="none">
    <path d="M13.5 9.5A6 6 0 016.5 2.5a6 6 0 100 11 6 6 0 007-4z" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
  </svg>
);

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();
}

function SectionLabel({ children }) {
  return (
    <div style={{
      fontSize: 11, fontWeight: 700, letterSpacing: "0.12em",
      textTransform: "uppercase", color: "#3d4966",
      padding: "0 12px", marginBottom: 2, marginTop: 20,
    }}>
      {children}
    </div>
  );
}

const ACTIVE_BG     = "#7c3aed";
const ACTIVE_SHADOW = "0 4px 14px rgba(124,58,237,0.4)";

function NavItem({ active, onClick, icon, label, T, danger }) {
  const [hovered, setHovered] = useState(false);
  const isLit = active || hovered;

  return (
    <div
      onClick={onClick}
      onMouseEnter={() => setHovered(true)}
      onMouseLeave={() => setHovered(false)}
      style={{
        display: "flex", alignItems: "center", gap: 10,
        padding: "11px 12px", borderRadius: 9, cursor: "pointer", marginBottom: 4,
        background: active
          ? ACTIVE_BG
          : hovered ? "rgba(139,92,246,0.08)" : "transparent",
        color: active ? "#fff" : hovered ? T.text : (danger ? "#ef4444" : T.muted),
        fontWeight: active ? 600 : 400,
        fontSize: 15,
        boxShadow: active ? ACTIVE_SHADOW : "none",
        transition: "all 0.15s",
      }}
    >
      <span style={{ flexShrink: 0, display: "flex", color: "inherit", opacity: active ? 1 : (isLit ? 0.85 : 0.55) }}>{icon}</span>
      <span style={{ flex: 1 }}>{label}</span>
    </div>
  );
}

function OverPopup({ onClose, nieuweVersie, T }) {
  return (
    <>
      {/* Overlay */}
      <div onClick={onClose} style={{
        position: "fixed", inset: 0, zIndex: 490,
        background: "rgba(0,0,0,0.55)", backdropFilter: "blur(4px)",
        display: "flex", alignItems: "center", justifyContent: "center",
      }}>
        {/* Modal */}
        <div onClick={(e) => e.stopPropagation()} style={{
          background: T.popupBg,
          border: `1px solid ${T.border}`,
          borderRadius: 16, padding: "28px 28px 24px", width: 300,
          boxShadow: "0 24px 60px rgba(0,0,0,0.5)",
          position: "relative",
        }}>
          {/* Sluitknop */}
          <button onClick={onClose} style={{
            position: "absolute", top: 14, right: 14,
            background: "transparent", border: "none", cursor: "pointer",
            color: T.muted, fontSize: 20, lineHeight: 1, padding: 4,
          }}>×</button>

          {/* Logo + naam */}
          <div style={{ display: "flex", alignItems: "center", gap: 12, marginBottom: 20 }}>
            <div style={{
              width: 44, height: 44, borderRadius: 12, flexShrink: 0,
              background: "rgba(124,58,237,0.15)", border: "1px solid rgba(124,58,237,0.3)",
              display: "flex", alignItems: "center", justifyContent: "center",
            }}>
              <svg width="22" height="22" viewBox="0 0 20 20" fill="none">
                <polyline points="2,15 6,9 10,12 14,5 18,8" stroke="#a855f7" strokeWidth="2.2" strokeLinejoin="round" strokeLinecap="round"/>
                <line x1="2" y1="17" x2="18" y2="17" stroke="rgba(168,85,247,0.35)" strokeWidth="1.4"/>
              </svg>
            </div>
            <div>
              <div style={{ fontSize: 15, fontWeight: 700, color: T.text }}>VibeFinance</div>
            </div>
          </div>

          <div style={{ height: 1, background: T.border, marginBottom: 16 }} />

          <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", marginBottom: 10 }}>
            <span style={{ fontSize: 13, color: T.muted }}>Versie</span>
            <span style={{ fontSize: 12, fontWeight: 700, color: "#a855f7", background: "rgba(124,58,237,0.15)", borderRadius: 6, padding: "3px 10px" }}>
              v{version}
            </span>
          </div>

          {nieuweVersie && (
            <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", marginBottom: 10 }}>
              <span style={{ fontSize: 13, color: T.muted }}>Nieuwe versie</span>
              <span style={{ fontSize: 12, fontWeight: 700, color: "#f97316", background: "rgba(249,115,22,0.12)", borderRadius: 6, padding: "3px 10px" }}>
                v{nieuweVersie.latest}
              </span>
            </div>
          )}

          <div style={{ height: 1, background: T.border, margin: "12px 0" }} />
          <div style={{ fontSize: 12, color: T.muted, textAlign: "center" }}>© {new Date().getFullYear()} VibeFinance</div>
        </div>
      </div>
    </>
  );
}

function DarkModeToggle({ darkMode, setDarkMode, T }) {
  return (
    <div
      onClick={() => setDarkMode(!darkMode)}
      style={{
        display: "flex", alignItems: "center", gap: 10,
        padding: "11px 12px", borderRadius: 9, cursor: "pointer", marginBottom: 4,
        color: T.muted, fontSize: 13.5, fontWeight: 500,
        transition: "background 0.12s",
      }}
      onMouseEnter={e => e.currentTarget.style.background = "rgba(255,255,255,0.04)"}
      onMouseLeave={e => e.currentTarget.style.background = "transparent"}
    >
      <span style={{ flexShrink: 0, display: "flex", opacity: 0.6 }}>{MOON_ICON}</span>
      <span style={{ flex: 1 }}>Dark Mode</span>
      {/* Toggle pill */}
      <div style={{
        width: 36, height: 20, borderRadius: 99, flexShrink: 0,
        background: darkMode ? "#7c3aed" : "rgba(255,255,255,0.15)",
        position: "relative", transition: "background 0.2s",
      }}>
        <div style={{
          position: "absolute", top: 3, left: darkMode ? 19 : 3,
          width: 14, height: 14, borderRadius: "50%",
          background: "#fff", transition: "left 0.2s",
          boxShadow: "0 1px 4px rgba(0,0,0,0.3)",
        }} />
      </div>
    </div>
  );
}

export default function NavBar() {
  const { tab, setTab, setShowUsers, setShowInstellingen, T, logout, darkMode, setDarkMode, currentUser, avatar } = useApp();
  const nieuweVersie = useUpdateCheck();
  const [overOpen,     setOverOpen]     = useState(false);

  return (
    <div style={{
      width: 260, minWidth: 260, flexShrink: 0,
      height: "100vh", position: "sticky", top: 0,
      background: T.sidebar ?? T.card,
      borderRight: `1px solid ${T.border}`,
      display: "flex", flexDirection: "column",
      zIndex: 100,
    }}>

      {/* Logo */}
      <div style={{ padding: "22px 16px 28px", display: "flex", alignItems: "center", gap: 10 }}>
        <div style={{
          width: 32, height: 32, flexShrink: 0, borderRadius: 9,
          background: "rgba(124,58,237,0.15)",
          border: "1px solid rgba(124,58,237,0.3)",
          display: "flex", alignItems: "center", justifyContent: "center",
        }}>
          <svg width="18" height="18" viewBox="0 0 20 20" fill="none">
            <polyline points="2,15 6,9 10,12 14,5 18,8"
              stroke="#a855f7" strokeWidth="2.2"
              strokeLinejoin="round" strokeLinecap="round"/>
            <line x1="2" y1="17" x2="18" y2="17"
              stroke="rgba(168,85,247,0.35)" strokeWidth="1.4"/>
          </svg>
        </div>
        <span style={{ fontSize: 17, fontWeight: 700, color: T.text, letterSpacing: "-0.3px" }}>VibeFinance</span>
      </div>

      {/* Nav */}
      <nav style={{ flex: 1, padding: "0 8px", overflowY: "auto" }}>

        {TABS.map((t, i) => (
          <NavItem key={t} active={tab === i} onClick={() => setTab(i)} icon={TAB_ICONS[i]} label={t} T={T} />
        ))}


        <NavItem onClick={() => setShowUsers(true)}        icon={GEBRUIKERS_ICON}  label="Gebruikers"   T={T} />
        <NavItem onClick={() => setShowInstellingen(true)} icon={INSTELLINGEN_ICON} label="Instellingen" T={T} />


        <div style={{ position: "relative" }}>
          <NavItem onClick={() => setOverOpen(o => !o)} icon={INFO_ICON} label="Over VibeFinance" active={false} T={T} />
          {overOpen && <OverPopup onClose={() => setOverOpen(false)} nieuweVersie={nieuweVersie} T={T} />}
          {nieuweVersie && !overOpen && (
            <div style={{ position: "absolute", top: 10, right: 26, width: 6, height: 6, borderRadius: "50%", background: "#f97316", pointerEvents: "none" }} />
          )}
        </div>
      </nav>

      {/* Uitloggen */}
      <div style={{ padding: "8px 8px 12px", borderTop: `1px solid ${T.border}` }}>
        <NavItem onClick={logout} icon={LOGOUT_ICON} label="Log Out" T={T} />
      </div>
    </div>
  );
}