import { useEffect, useState } from "react";
import { API_BASE } from "../../config";

const inputStyle = { padding: "0.6rem", background: "#222", color: "#eee", border: "1px solid #333", borderRadius: "8px", width: "100%", boxSizing: "border-box" };
const btn = (bg) => ({ padding: "0.5rem 1rem", background: bg, color: "#fff", border: "none", borderRadius: "8px", cursor: "pointer" });
const labelStyle = { display: "block", fontSize: "0.72rem", color: "#888", marginBottom: "0.3rem", textTransform: "uppercase", letterSpacing: "0.05em" };

const BLANK = {
  label: "", username: "", password: "", from_addr: "", from_name: "",
  imap_host: "imap.mail.me.com", imap_port: 993, smtp_host: "smtp.mail.me.com", smtp_port: 587,
};

// macOS-Mail-style "Internet Accounts" window: accounts on the left, the
// selected account's config on the right. Lets you manage several mailboxes
// that happen to share the same IMAP/SMTP server.
export function MailAccounts({ onClose, onChanged }) {
  const [accounts, setAccounts] = useState(null); // null = loading
  const [selectedId, setSelectedId] = useState(null); // null = "add account" form
  const [form, setForm] = useState(BLANK);
  const [busy, setBusy] = useState(false);
  const [note, setNote] = useState("");

  const selectAccount = (id, list = accounts) => {
    setNote("");
    setSelectedId(id);
    if (id === null) { setForm(BLANK); return; }
    const a = (list || []).find(x => x.id === id);
    if (a) setForm({ ...a, password: "" });
  };

  const load = async (selectAfter) => {
    const r = await fetch(`${API_BASE}/mail/accounts`);
    const list = r.ok ? (await r.json()).accounts || [] : [];
    setAccounts(list);
    onChanged && onChanged(list);
    if (selectAfter !== undefined) selectAccount(selectAfter, list);
    return list;
  };

  useEffect(() => {
    load().then(list => { if (list.length) selectAccount(list[0].id, list); });
    // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);

  const save = async () => {
    setBusy(true); setNote("Saving…");
    try {
      const url = selectedId ? `${API_BASE}/mail/accounts/${selectedId}` : `${API_BASE}/mail/accounts`;
      const r = await fetch(url, {
        method: selectedId ? "PUT" : "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(form),
      });
      if (!r.ok) { setNote("Save failed."); return; }
      const saved = await r.json();
      setNote("Saved.");
      await load(saved.id);
    } finally { setBusy(false); }
  };

  const test = async () => {
    if (!selectedId) { setNote("Save the account first."); return; }
    setBusy(true); setNote("Testing…");
    try {
      const r = await fetch(`${API_BASE}/mail/accounts/${selectedId}/test`, { method: "POST" });
      const d = await r.json().catch(() => ({}));
      setNote(d.ok ? `Connected — ${d.folders} folders.` : `Connection failed: ${d.error || "check credentials"}`);
    } finally { setBusy(false); }
  };

  const remove = async () => {
    if (!selectedId) return;
    if (!window.confirm(`Delete account "${form.label || form.from_addr || form.username}"?`)) return;
    setBusy(true);
    try {
      await fetch(`${API_BASE}/mail/accounts/${selectedId}`, { method: "DELETE" });
      const list = await load();
      selectAccount(list.length ? list[0].id : null, list);
    } finally { setBusy(false); }
  };

  const update = (k, v) => setForm(f => ({ ...f, [k]: v }));

  return (
    <div onClick={onClose}
      style={{ position: "fixed", inset: 0, background: "rgba(0,0,0,0.6)", display: "flex", alignItems: "center", justifyContent: "center", zIndex: 200, padding: "2rem" }}>
      <div onClick={e => e.stopPropagation()}
        style={{ background: "#1a1a1a", border: "1px solid #333", borderRadius: "12px", width: "720px", maxWidth: "100%", height: "520px", maxHeight: "100%", display: "flex", flexDirection: "column", overflow: "hidden" }}>
        <div style={{ display: "flex", justifyContent: "space-between", alignItems: "center", padding: "0.85rem 1.1rem", borderBottom: "1px solid #2a2a2a", flexShrink: 0 }}>
          <strong>Mail Accounts</strong>
          <button onClick={onClose} style={{ background: "none", border: "none", color: "#aaa", fontSize: "1.2rem", cursor: "pointer" }}>✕</button>
        </div>

        <div style={{ display: "flex", flexGrow: 1, minHeight: 0 }}>
          {/* Left: accounts bar */}
          <div style={{ width: "200px", flexShrink: 0, borderRight: "1px solid #2a2a2a", display: "flex", flexDirection: "column" }}>
            <div style={{ flexGrow: 1, overflowY: "auto", padding: "0.5rem" }}>
              {accounts === null ? (
                <div style={{ color: "#666", fontSize: "0.82rem", padding: "0.5rem" }}>Loading…</div>
              ) : accounts.length === 0 ? (
                <div style={{ color: "#666", fontSize: "0.8rem", padding: "0.5rem" }}>No accounts yet.</div>
              ) : accounts.map(a => (
                <div key={a.id} onClick={() => selectAccount(a.id)}
                  style={{
                    padding: "0.5rem 0.6rem", borderRadius: "6px", cursor: "pointer", marginBottom: "0.2rem",
                    background: selectedId === a.id ? "#1c2a3a" : "transparent",
                    color: selectedId === a.id ? "#fff" : "#ccc",
                  }}>
                  <div style={{ fontSize: "0.85rem", fontWeight: 600, whiteSpace: "nowrap", overflow: "hidden", textOverflow: "ellipsis" }}>
                    {a.label || a.from_addr || a.username || "(unnamed)"}
                  </div>
                  <div style={{ fontSize: "0.72rem", color: a.configured ? "#8aff8a" : "#c9a227", whiteSpace: "nowrap", overflow: "hidden", textOverflow: "ellipsis" }}>
                    {a.configured ? (a.from_addr || a.username) : "needs password"}
                  </div>
                </div>
              ))}
            </div>
            <div style={{ padding: "0.5rem", borderTop: "1px solid #2a2a2a" }}>
              <button onClick={() => selectAccount(null)} style={{ ...btn("transparent"), border: "1px solid #444", color: "#ccc", width: "100%" }}>+ Add account</button>
            </div>
          </div>

          {/* Right: selected account form */}
          <div style={{ flexGrow: 1, padding: "1.1rem", overflowY: "auto" }}>
            <h3 style={{ margin: "0 0 0.75rem", fontSize: "0.95rem", color: "#eee" }}>
              {selectedId ? "Edit account" : "New account"}
            </h3>
            <div style={{ display: "flex", flexDirection: "column", gap: "0.6rem", maxWidth: "440px" }}>
              <div>
                <label style={labelStyle}>Nickname (optional)</label>
                <input value={form.label} onChange={e => update("label", e.target.value)} placeholder="e.g. Personal, Work" style={inputStyle} />
              </div>
              <div>
                <label style={labelStyle}>Apple ID (login)</label>
                <input value={form.username} onChange={e => update("username", e.target.value)} placeholder="you@icloud.com" style={inputStyle} />
              </div>
              <div>
                <label style={labelStyle}>{selectedId ? "App-specific password (blank = keep current)" : "App-specific password"}</label>
                <input type="password" value={form.password} onChange={e => update("password", e.target.value)} style={inputStyle} />
              </div>
              <div>
                <label style={labelStyle}>From address</label>
                <input value={form.from_addr} onChange={e => update("from_addr", e.target.value)} placeholder="nexus@enderofwings.com" style={inputStyle} />
              </div>
              <div>
                <label style={labelStyle}>From name (optional)</label>
                <input value={form.from_name} onChange={e => update("from_name", e.target.value)} style={inputStyle} />
              </div>
              <div style={{ display: "flex", gap: "0.6rem" }}>
                <div style={{ flex: 1 }}>
                  <label style={labelStyle}>IMAP host</label>
                  <input value={form.imap_host} onChange={e => update("imap_host", e.target.value)} style={inputStyle} />
                </div>
                <div style={{ width: "90px" }}>
                  <label style={labelStyle}>Port</label>
                  <input type="number" value={form.imap_port} onChange={e => update("imap_port", parseInt(e.target.value) || 0)} style={inputStyle} />
                </div>
              </div>
              <div style={{ display: "flex", gap: "0.6rem" }}>
                <div style={{ flex: 1 }}>
                  <label style={labelStyle}>SMTP host</label>
                  <input value={form.smtp_host} onChange={e => update("smtp_host", e.target.value)} style={inputStyle} />
                </div>
                <div style={{ width: "90px" }}>
                  <label style={labelStyle}>Port</label>
                  <input type="number" value={form.smtp_port} onChange={e => update("smtp_port", parseInt(e.target.value) || 0)} style={inputStyle} />
                </div>
              </div>

              <div style={{ display: "flex", gap: "0.6rem", alignItems: "center", marginTop: "0.4rem" }}>
                <button onClick={save} disabled={busy} style={btn(busy ? "#555" : "#007acc")}>{selectedId ? "Save" : "Create"}</button>
                {selectedId && <button onClick={test} disabled={busy} style={btn("#2a4a6a")}>Test connection</button>}
                {selectedId && <button onClick={remove} disabled={busy} style={{ ...btn("#3a1a1a"), color: "#ff8a80" }}>Delete</button>}
              </div>
              <span style={{ color: "#8ab4ff", fontSize: "0.85rem" }}>{note}</span>
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}