'use client';

import { useEffect, useState } from 'react';
import { useParams } from 'next/navigation';
import { apiFetch } from '@/lib/api';
import { StatusPill } from '@/components/status-pill';
import { CodeBlock } from '@/components/code-block';
import { InstallSnippets } from '@/components/install-snippets';
import { StreamingLogs } from '@/components/streaming-logs';
import { Button } from '@/components/ui/button';
import { Textarea, Label } from '@/components/input';
import { cn } from '@/lib/cn';
import type { ToolSpec } from '@bmm/types';

interface ServerDetail {
  id: string;
  name: string;
  slug: string;
  status: string;
  publicUrl: string | null;
  toolsSchema: ToolSpec[] | null;
  currentVersion: number;
  oauthEnabled: boolean;
  createdAt: string;
  updatedAt: string;
}

interface BuildSummary {
  id: string;
  version: number;
  status: string;
  startedAt: string | null;
  finishedAt: string | null;
  errorMessage: string | null;
}

type Tab = 'overview' | 'tools' | 'logs' | 'metrics' | 'secrets' | 'iterate';

export default function ServerDetailPage() {
  const params = useParams<{ id: string }>();
  const [server, setServer] = useState<ServerDetail | null>(null);
  const [builds, setBuilds] = useState<BuildSummary[]>([]);
  const [tab, setTab] = useState<Tab>('overview');
  const [iteratePrompt, setIteratePrompt] = useState('');
  const [latestBuildId, setLatestBuildId] = useState<string | null>(null);

  async function refresh() {
    const r = await apiFetch<{ server: ServerDetail; builds: BuildSummary[] }>(
      `/v1/servers/${params.id}`,
    );
    setServer(r.server);
    setBuilds(r.builds);
    if (r.builds.length > 0 && !latestBuildId) {
      setLatestBuildId(r.builds[0]!.id);
    }
  }

  useEffect(() => {
    refresh();
    const t = setInterval(refresh, 4000);
    return () => clearInterval(t);
  }, [params.id]);

  async function onIterate() {
    if (!server) return;
    const res = await apiFetch<{ build: { id: string } }>(
      `/v1/servers/${server.id}/iterate`,
      { method: 'POST', body: JSON.stringify({ prompt: iteratePrompt, secrets: {} }) },
    );
    setLatestBuildId(res.build.id);
    setIteratePrompt('');
    setTab('logs');
  }

  if (!server) {
    return (
      <div className="mx-auto max-w-7xl px-6 py-8 text-[12.5px] text-[--color-fg-muted]">Loading…</div>
    );
  }

  const tabs: { id: Tab; label: string }[] = [
    { id: 'overview', label: 'Overview' },
    { id: 'tools', label: 'Tools' },
    { id: 'logs', label: 'Logs' },
    { id: 'metrics', label: 'Metrics' },
    { id: 'secrets', label: 'Secrets' },
    { id: 'iterate', label: 'Iterate' },
  ];

  return (
    <div className="mx-auto max-w-7xl px-6 py-8">
      <div className="flex items-baseline justify-between gap-4">
        <div>
          <div className="flex items-center gap-2.5">
            <h1 className="text-[22px] font-semibold tracking-tight">{server.name}</h1>
            <StatusPill status={server.status as never} />
          </div>
          <div className="mt-1 flex items-center gap-3 text-[12.5px] text-[--color-fg-muted]">
            <span className="mono">{server.slug}</span>
            <span>·</span>
            <span>v{server.currentVersion}</span>
            {server.publicUrl && (
              <>
                <span>·</span>
                <a
                  href={`${server.publicUrl}/mcp`}
                  target="_blank"
                  rel="noreferrer"
                  className="mono hover:text-[--color-fg]"
                >
                  {server.publicUrl}/mcp
                </a>
              </>
            )}
          </div>
        </div>
      </div>

      <div className="mt-6 flex gap-1 border-b border-[--color-border]">
        {tabs.map((t) => (
          <button
            key={t.id}
            type="button"
            onClick={() => setTab(t.id)}
            className={cn(
              'relative px-3 py-2 text-[12.5px] transition-colors duration-200 ease-out',
              tab === t.id
                ? 'text-[--color-fg]'
                : 'text-[--color-fg-muted] hover:text-[--color-fg]',
            )}
          >
            {t.label}
            {tab === t.id && (
              <span className="absolute inset-x-0 -bottom-px h-px bg-[--color-fg]" />
            )}
          </button>
        ))}
      </div>

      <div className="mt-6">
        {tab === 'overview' && (
          <div className="grid gap-4 md:grid-cols-2">
            <div className="panel p-4">
              <div className="text-[11px] uppercase tracking-wider text-[--color-fg-subtle]">
                Endpoint
              </div>
              <div className="mt-3">
                {server.publicUrl ? (
                  <CodeBlock code={`${server.publicUrl}/mcp`} />
                ) : (
                  <div className="text-[12.5px] text-[--color-fg-muted]">Not deployed yet.</div>
                )}
              </div>
              <div className="mt-4 flex items-center gap-2 text-[12px] text-[--color-fg-muted]">
                <span className="size-1.5 rounded-full bg-emerald-400" />
                OAuth 2.1 enforced · Streamable HTTP
              </div>
            </div>
            <div className="panel p-4">
              <div className="text-[11px] uppercase tracking-wider text-[--color-fg-subtle]">
                Builds
              </div>
              <div className="mt-3 space-y-2">
                {builds.slice(0, 5).map((b) => (
                  <div key={b.id} className="flex items-center justify-between text-[12.5px]">
                    <span className="mono text-[--color-fg-muted]">v{b.version}</span>
                    <StatusPill status={b.status as never} />
                    <span className="mono text-[11px] text-[--color-fg-subtle]">
                      {b.startedAt ? new Date(b.startedAt).toLocaleString() : '—'}
                    </span>
                  </div>
                ))}
              </div>
            </div>
            {server.publicUrl && (
              <div className="panel p-4 md:col-span-2">
                <div className="text-[11px] uppercase tracking-wider text-[--color-fg-subtle]">
                  Install
                </div>
                <div className="mt-3">
                  <InstallSnippets
                    input={{ name: server.name, slug: server.slug, publicUrl: server.publicUrl }}
                  />
                </div>
              </div>
            )}
          </div>
        )}

        {tab === 'tools' && (
          <div className="panel p-4">
            {!server.toolsSchema || server.toolsSchema.length === 0 ? (
              <div className="text-[12.5px] text-[--color-fg-muted]">No tools yet.</div>
            ) : (
              <div className="space-y-3">
                {server.toolsSchema.map((tool) => (
                  <div key={tool.name} className="rounded-md border border-[--color-border] p-3">
                    <div className="flex items-baseline gap-2">
                      <span className="mono text-[13px] font-semibold">{tool.name}</span>
                    </div>
                    <p className="mt-1 text-[12.5px] text-[--color-fg-muted]">{tool.description}</p>
                    {Object.keys(tool.inputSchema ?? {}).length > 0 && (
                      <div className="mt-2">
                        <CodeBlock
                          label="input schema"
                          code={JSON.stringify(tool.inputSchema, null, 2)}
                        />
                      </div>
                    )}
                  </div>
                ))}
              </div>
            )}
          </div>
        )}

        {tab === 'logs' && (
          latestBuildId ? (
            <StreamingLogs buildId={latestBuildId} />
          ) : (
            <div className="panel p-4 text-[12.5px] text-[--color-fg-muted]">
              No builds to stream yet.
            </div>
          )
        )}

        {tab === 'metrics' && (
          <div className="panel p-4">
            <div className="grid gap-4 md:grid-cols-3">
              <Metric label="Calls (24h)" value="0" />
              <Metric label="P95 latency" value="—" />
              <Metric label="Error rate" value="0%" />
            </div>
            <p className="mt-4 text-[12px] text-[--color-fg-subtle]">
              Live metrics begin streaming after the first tool call.
            </p>
          </div>
        )}

        {tab === 'secrets' && (
          <div className="panel p-4 text-[12.5px] text-[--color-fg-muted]">
            Secrets are AES-256-GCM encrypted at rest. They are injected as environment variables
            into your container and are never echoed back. Use the wizard or CLI to rotate them.
          </div>
        )}

        {tab === 'iterate' && (
          <div className="panel p-4">
            <Label hint="A new build will be queued; rolling deploy keeps current version live until ready.">
              Extend the server
            </Label>
            <Textarea
              rows={4}
              className="mt-2"
              value={iteratePrompt}
              onChange={(e) => setIteratePrompt(e.target.value)}
              placeholder="Add a tool: create_page that POSTs to /v1/pages with title and body."
            />
            <div className="mt-3 flex justify-end">
              <Button
                variant="primary"
                size="md"
                disabled={iteratePrompt.length < 10}
                onClick={onIterate}
              >
                Queue rebuild →
              </Button>
            </div>
          </div>
        )}
      </div>
    </div>
  );
}

function Metric({ label, value }: { label: string; value: string }) {
  return (
    <div>
      <div className="text-[11px] uppercase tracking-wider text-[--color-fg-subtle]">{label}</div>
      <div className="mt-1 text-[22px] font-semibold tracking-tight">{value}</div>
    </div>
  );
}