// Settings scene — identity, backend URL, polling cadence, theme.
import { useState } from "react";
import { useApp } from "../state/store";
import { api } from "../lib/api";
import { User, Refresh, Cog, Pulse, Layers, Check } from "../components/icons";

const COMMON_EMAILS = [
  "dev@flow-master.ai",
  "procurement.operator@flowmaster.local",
  "finance.lead@flowmaster.local",
  "ops.admin@flowmaster.local",
];

export default function Settings() {
  const userEmail = useApp((s) => s.userEmail);
  const actor = useApp((s) => s.actor);
  const userDisplayName = useApp((s) => s.userDisplayName);
  const loginAs = useApp((s) => s.loginAs);
  const pollEverySec = useApp((s) => s.pollEverySec);
  const setPollEverySec = useApp((s) => s.setPollEverySec);
  const theme = useApp((s) => s.theme);
  const setTheme = useApp((s) => s.setTheme);
  const consoleOpen = useApp((s) => s.consoleOpen);
  const setConsoleOpen = useApp((s) => s.setConsoleOpen);
  const mode = useApp((s) => s.mode);
  const setMode = useApp((s) => s.setMode);
  const refreshLive = useApp((s) => s.refreshLive);
  const pushToast = useApp((s) => s.pushToast);

  const [emailInput, setEmailInput] = useState(userEmail);
  const [signingIn, setSigningIn] = useState(false);

  const signIn = async (email: string) => {
    setSigningIn(true);
    try {
      await loginAs(email);
    } finally {
      setSigningIn(false);
    }
  };

  const clearToken = () => {
    api.clearToken();
    pushToast("info", "Cleared bearer token. Next request will re-login.");
  };

  return (
    <div className="settings">
      <header className="studio-head">
        <div>
          <div className="mc-hero-eyebrow"><Cog size={12} /> Settings</div>
          <h2 className="mc-hero-title">Identity, backend & UI</h2>
          <div className="mc-hero-sub">Everything here is persisted to localStorage and survives reloads.</div>
        </div>
      </header>

      <div className="studio-grid">
        <section className="studio-panel">
          <h3 className="panel-h"><User size={12} /> Identity</h3>
          <div className="settings-id">
            <div className="i-field">
              <span>Current</span>
              <span className="mono">{actor?.user_id?.slice(0, 12) ?? "—"}</span>
            </div>
            <div className="i-field">
              <span>Email</span>
              <span>{userEmail}</span>
            </div>
            <div className="i-field">
              <span>Display name</span>
              <span>{userDisplayName ?? "—"}</span>
            </div>
            <div className="i-field">
              <span>Backend</span>
              <span className="mono">{api.config.baseUrl || "(same-origin via /api)"}</span>
            </div>
          </div>

          <h4 className="i-h" style={{ marginTop: 16 }}>Sign in as</h4>
          <div className="studio-rows">
            <div className="studio-row">
              <input
                className="studio-input"
                placeholder="someone@flow-master.ai"
                value={emailInput}
                onChange={(e) => setEmailInput(e.target.value)}
              />
              <button className="btn btn-primary" onClick={() => signIn(emailInput)} disabled={signingIn || !emailInput.includes("@")}>
                {signingIn ? <span className="spin" /> : <Check size={12} />} Sign in
              </button>
            </div>
            <div className="quick-users">
              {COMMON_EMAILS.map((e) => (
                <button key={e} className="link-btn" onClick={() => { setEmailInput(e); signIn(e); }} disabled={signingIn}>
                  {e}
                </button>
              ))}
            </div>
          </div>
          <button className="link-btn" style={{ marginTop: 10 }} onClick={clearToken}>
            <Refresh size={12} /> Clear bearer token
          </button>
        </section>

        <section className="studio-panel">
          <h3 className="panel-h"><Pulse size={12} /> Data mode & polling</h3>
          <div className="i-field">
            <span>Current mode</span>
            <span className={`mode-pill mode-${mode}`}>{mode === "live" ? "LIVE" : "SNAPSHOT"}</span>
          </div>
          <div className="settings-row">
            <button className="btn btn-primary" onClick={() => setMode(mode === "live" ? "snapshot" : "live")} disabled={signingIn}>
              <Refresh size={12} /> {mode === "live" ? "Switch to snapshot" : "Switch to live"}
            </button>
            {mode === "live" && (
              <button className="btn btn-ghost" onClick={refreshLive}>
                <Refresh size={12} /> Refresh now
              </button>
            )}
          </div>
          <label className="studio-field" style={{ marginTop: 12 }}>
            <span>Auto-refresh every (seconds)</span>
            <input
              type="number"
              className="studio-input mono"
              min={2}
              max={120}
              value={pollEverySec}
              onChange={(e) => setPollEverySec(Number(e.target.value) || 8)}
            />
          </label>
          <div className="settings-hint">Polling only runs in LIVE mode. Currently {mode === "live" ? "polling" : "paused"}.</div>
        </section>

        <section className="studio-panel">
          <h3 className="panel-h"><Cog size={12} /> Appearance</h3>
          <div className="settings-row">
            <button className={`btn ${theme === "dark" ? "btn-primary" : "btn-ghost"}`} onClick={() => setTheme("dark")}>
              Dark
            </button>
            <button className={`btn ${theme === "light" ? "btn-primary" : "btn-ghost"}`} onClick={() => setTheme("light")}>
              Light
            </button>
          </div>
          <label className="settings-toggle" style={{ marginTop: 12 }}>
            <input type="checkbox" checked={consoleOpen} onChange={(e) => setConsoleOpen(e.target.checked)} />
            <span>Show live API console by default</span>
          </label>
        </section>

        <section className="studio-panel">
          <h3 className="panel-h"><Layers size={12} /> About</h3>
          <p className="settings-text">
            FlowMaster Mission Control. Live at{" "}
            <a className="settings-link" href="https://canvas.flow-master.ai" target="_blank" rel="noreferrer">
              canvas.flow-master.ai
            </a>. Every action hits the real EA2 backend — the live console shows
            every fetch.
          </p>
        </section>
      </div>
    </div>
  );
}