"use client";

import * as React from "react";
import { AnimatePresence, motion } from "framer-motion";
import { Ban, Check, Plus, Send, ShieldCheck, Trash2, Undo2, X } from "lucide-react";
import { api, bytes, type AdminUser } from "@/lib/api";
import { useToast } from "@/components/toast";
import { Button } from "@/components/ui/button";
import { cn } from "@/lib/utils";

export function UsersTable({
  users,
  roles,
  me,
  refresh,
}: {
  users: AdminUser[];
  roles: string[];
  me: string | null;
  refresh: () => void;
}) {
  const [adding, setAdding] = React.useState(false);

  return (
    <div className="card rounded-panel p-5">
      <div className="mb-3 flex flex-wrap items-center justify-between gap-2">
        <div>
          <h3 className="text-callout font-bold uppercase tracking-[0.9px] text-dim">
            Users
          </h3>
          <p className="mt-1 max-w-[62ch] text-callout text-dim">
            Adding someone here <em>is</em> the authorisation, and it binds them to that
            one provider. If SMTP is set up they also get an email; the link in it
            carries no token, because possession of the mail isn&rsquo;t what lets
            anyone in — the row is.
          </p>
        </div>
        <Button size="pill" variant={adding ? "secondary" : "primary"} onClick={() => setAdding(!adding)}>
          {adding ? <X className="h-3.5 w-3.5" /> : <Plus className="h-3.5 w-3.5" />}
          {adding ? "Cancel" : "Invite"}
        </Button>
      </div>

      <AnimatePresence>
        {adding && (
          <InviteForm
            roles={roles}
            onDone={() => {
              setAdding(false);
              refresh();
            }}
          />
        )}
      </AnimatePresence>

      <div className="mt-3 flex flex-col gap-2">
        <AnimatePresence initial={false}>
          {users.map((u) => (
            <UserRow key={u.username} u={u} roles={roles} isMe={u.username === me} refresh={refresh} />
          ))}
        </AnimatePresence>
      </div>
    </div>
  );
}

function UserRow({
  u,
  roles,
  isMe,
  refresh,
}: {
  u: AdminUser;
  roles: string[];
  isMe: boolean;
  refresh: () => void;
}) {
  const toast = useToast();
  const [busy, setBusy] = React.useState(false);
  const [confirmDel, setConfirmDel] = React.useState(false);

  const run = async (fn: () => Promise<unknown>, ok: string) => {
    setBusy(true);
    try {
      await fn();
      toast(ok);
      refresh();
    } catch (e) {
      toast((e as Error).message, true);
    }
    setBusy(false);
  };

  const quotaPct = u.quota ? (u.usage.requests / u.quota) * 100 : null;

  return (
    <motion.div
      layout
      initial={{ opacity: 0, y: 8 }}
      animate={{ opacity: 1, y: 0 }}
      exit={{ opacity: 0, scale: 0.98 }}
      transition={{ type: "spring", stiffness: 360, damping: 32 }}
      className={cn(
        "card rounded-card p-3",
        u.disabled && "opacity-60",
      )}
    >
      <div className="flex flex-wrap items-center gap-3">
        <div className="h-9 w-9 shrink-0 overflow-hidden rounded-full bg-faint">
          {u.avatar && (
            /* eslint-disable-next-line @next/next/no-img-element */
            <img
              src={u.avatar}
              alt=""
              className="h-full w-full object-cover"
              onError={(e) => (e.currentTarget.style.visibility = "hidden")}
            />
          )}
        </div>

        <div className="min-w-0 flex-1">
          <div className="flex items-center gap-1.5 text-body font-semibold clamp1">
            {u.display || u.username}
            {u.role === "admin" && <ShieldCheck className="h-3.5 w-3.5 shrink-0 text-accent" />}
            {isMe && <span className="text-caption font-normal text-dim">(you)</span>}
          </div>
          <div className="text-caption text-dim clamp1">
            {u.username} · {u.provider}
            {u.last_seen && ` · seen ${u.last_seen.slice(0, 10)}`}
            {u.disabled && " · disabled"}
          </div>
        </div>

        <select
          value={u.role}
          disabled={busy}
          onChange={(e) => run(() => api.admin.patchUser(u.username, { role: e.target.value }), `${u.username} is now ${e.target.value}`)}
          aria-label={`Role for ${u.username}`}
          className="shrink-0 cursor-pointer rounded-full border border-edge-hi bg-transparent
                     px-2.5 py-1 text-caption text-ink outline-none
                     focus:border-accent-line"
        >
          {roles.map((r) => (
            <option key={r} value={r} className="bg-[#12141c]">
              {r}
            </option>
          ))}
        </select>

        {/* Never signed in and we have somewhere to write: the likeliest
            reason is they missed the mail, so offer it where that is visible.
            Resending is harmless — the link carries no token. */}
        {u.email && !u.last_seen && (
          <Button
            size="sm"
            variant="quiet"
            disabled={busy}
            onClick={() =>
              run(() => api.admin.resend(u.username), `Invite resent to ${u.email}`)
            }
            title={`Resend the invitation to ${u.email}`}
          >
            <Send className="h-3.5 w-3.5" />
          </Button>
        )}

        <Button
          size="sm"
          variant="quiet"
          disabled={busy}
          onClick={() =>
            run(
              () => api.admin.patchUser(u.username, { disabled: !u.disabled }),
              u.disabled ? `${u.username} re-enabled` : `${u.username} disabled`,
            )
          }
          title={u.disabled ? "Re-enable" : "Disable and revoke sessions"}
        >
          {u.disabled ? <Undo2 className="h-3.5 w-3.5" /> : <Ban className="h-3.5 w-3.5" />}
        </Button>

        {confirmDel ? (
          <div className="flex shrink-0 gap-1">
            <Button
              size="sm"
              variant="quiet"
              disabled={busy}
              className="border-err/50 text-err"
              onClick={() => run(() => api.admin.deleteUser(u.username), `${u.username} deleted`)}
            >
              <Check className="h-3.5 w-3.5" /> Delete
            </Button>
            <Button size="sm" variant="quiet" onClick={() => setConfirmDel(false)}>
              <X className="h-3.5 w-3.5" />
            </Button>
          </div>
        ) : (
          <Button
            size="sm"
            variant="quiet"
            disabled={busy}
            onClick={() => setConfirmDel(true)}
            title="Delete user (their request history is kept)"
          >
            <Trash2 className="h-3.5 w-3.5" />
          </Button>
        )}
      </div>

      <div className="mt-2.5 flex flex-wrap items-center gap-x-5 gap-y-2 pl-12 text-caption">
        <QuotaField
          label="Requests / month"
          value={u.quota}
          suffix={`used ${u.usage.requests}`}
          pct={quotaPct}
          onSave={(v) => run(() => api.admin.patchUser(u.username, { quota: v }), "Quota updated")}
        />
        <QuotaField
          label="Storage (GB)"
          value={+(u.storage_quota / 2 ** 30).toFixed(1)}
          suffix={`used ${bytes(u.usage.storage)}`}
          pct={u.storage_quota ? (u.usage.storage / u.storage_quota) * 100 : null}
          onSave={(v) =>
            run(() => api.admin.patchUser(u.username, { storage_quota_gb: v }), "Quota updated")
          }
        />
        {u.bootstrap && (
          <span className="text-caption text-warn" title="Listed in MUSE_ALLOWED_USERS">
            bootstrap account — disabling won&rsquo;t lock them out
          </span>
        )}
      </div>
    </motion.div>
  );
}

/** Number input that only commits on blur or Enter, so a quota isn't PATCHed
 *  once per keystroke while you type "120". */
function QuotaField({
  label,
  value,
  suffix,
  pct,
  onSave,
}: {
  label: string;
  value: number;
  suffix: string;
  pct: number | null;
  onSave: (v: number) => void;
}) {
  const [v, setV] = React.useState(String(value));
  React.useEffect(() => setV(String(value)), [value]);

  const commit = () => {
    const n = Number(v);
    if (!Number.isFinite(n) || n < 0) {
      setV(String(value));
      return;
    }
    if (n !== value) onSave(n);
  };

  return (
    <label className="flex items-center gap-2">
      <span className="text-dim">{label}</span>
      <input
        type="number"
        min={0}
        step="any"
        value={v}
        onChange={(e) => setV(e.target.value)}
        onBlur={commit}
        onKeyDown={(e) => e.key === "Enter" && (e.target as HTMLInputElement).blur()}
        className="w-16 rounded-md border border-edge-hi bg-transparent px-1.5 py-0.5
                   text-right text-ink outline-none focus:border-accent-line"
      />
      <span className={cn("text-dim", pct != null && pct >= 90 && "text-err")}>
        {Number(v) === 0 ? "unlimited" : suffix}
      </span>
    </label>
  );
}

function InviteForm({ roles, onDone }: { roles: string[]; onDone: () => void }) {
  const toast = useToast();
  const [username, setUsername] = React.useState("");
  // Google first: it is the invite path for everyone who is not the owner,
  // and its username is already the address to write to.
  const [provider, setProvider] = React.useState("google");
  const [role, setRole] = React.useState("user");
  const [quota, setQuota] = React.useState("0");
  const [storage, setStorage] = React.useState("0");
  const [email, setEmail] = React.useState("");
  const [busy, setBusy] = React.useState(false);

  const submit = async () => {
    if (!username.trim()) {
      toast("Username required", true);
      return;
    }
    setBusy(true);
    try {
      const r = await api.admin.addUser({
        username: username.trim(),
        provider,
        role,
        quota: Number(quota) || 0,
        storage_quota_gb: Number(storage) || 0,
        ...(provider === "github" && email.trim() ? { email: email.trim() } : {}),
      });
      // Say whether the mail actually went. "Invited" alone would read as
      // success while the person waits for an email that was never sent.
      toast(
        r.invite_sent
          ? `Invited ${username.trim()} — email sent`
          : `Invited ${username.trim()} — no email (${r.invite_why})`,
      );
      onDone();
    } catch (e) {
      toast((e as Error).message, true);
    }
    setBusy(false);
  };

  const input =
    "rounded-card border border-edge-hi bg-transparent px-3 py-2 text-callout " +
    "text-ink outline-none focus:border-accent-line";

  return (
    <motion.div
      initial={{ opacity: 0, height: 0 }}
      animate={{ opacity: 1, height: "auto" }}
      exit={{ opacity: 0, height: 0 }}
      className="overflow-hidden"
    >
      <div className="card mt-1 flex flex-wrap items-end gap-2.5 rounded-card p-3">
        <label className="flex min-w-[210px] flex-1 flex-col gap-1">
          <span className="text-caption text-dim">
            {provider === "github" ? "GitHub username" : "Google email"}
          </span>
          <input
            value={username}
            onChange={(e) => setUsername(e.target.value)}
            onKeyDown={(e) => e.key === "Enter" && submit()}
            placeholder={provider === "github" ? "octocat" : "friend@gmail.com"}
            className={input}
            autoFocus
          />
        </label>
        <label className="flex flex-col gap-1">
          <span className="text-caption text-dim">Provider</span>
          <select value={provider} onChange={(e) => setProvider(e.target.value)} className={cn(input, "cursor-pointer")}>
            <option value="google" className="bg-[#12141c]">Google</option>
            <option value="github" className="bg-[#12141c]">GitHub</option>
          </select>
        </label>
        {/* Only GitHub needs this asked. A Google invite already is an
            address, and a second field for the same value invites them to
            disagree. */}
        {provider === "github" && (
          <label className="flex min-w-[190px] flex-col gap-1">
            <span className="text-caption text-dim">Email them at (optional)</span>
            <input
              type="email"
              value={email}
              onChange={(e) => setEmail(e.target.value)}
              onKeyDown={(e) => e.key === "Enter" && submit()}
              placeholder="octocat@example.com"
              className={input}
            />
          </label>
        )}
        <label className="flex flex-col gap-1">
          <span className="text-caption text-dim">Role</span>
          <select value={role} onChange={(e) => setRole(e.target.value)} className={cn(input, "cursor-pointer")}>
            {roles.map((r) => (
              <option key={r} value={r} className="bg-[#12141c]">
                {r}
              </option>
            ))}
          </select>
        </label>
        <label className="flex w-24 flex-col gap-1">
          <span className="text-caption text-dim">Req/month</span>
          <input type="number" min={0} value={quota} onChange={(e) => setQuota(e.target.value)} className={input} />
        </label>
        <label className="flex w-24 flex-col gap-1">
          <span className="text-caption text-dim">Storage GB</span>
          <input type="number" min={0} value={storage} onChange={(e) => setStorage(e.target.value)} className={input} />
        </label>
        <Button onClick={submit} disabled={busy}>
          {busy ? "Inviting…" : "Invite"}
        </Button>
        <span className="w-full text-caption text-dim">0 means unlimited.</span>
      </div>
    </motion.div>
  );
}