'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 { Input, 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' | 'publish';

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' },
    { id: 'publish', label: 'Publish' },
  ];

  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>
        )}

        {tab === 'publish' && <PublishPanel serverId={server.id} serverStatus={server.status} />}
      </div>
    </div>
  );
}

const CATEGORIES = [
  'productivity',
  'developer-tools',
  'data',
  'communication',
  'finance',
  'crm',
  'analytics',
  'devops',
  'demo',
  'other',
];

interface SecretHint {
  key: string;
  description: string;
  howToGetUrl: string;
}

interface ExistingTemplate {
  id: string;
  slug: string;
  title: string;
  status: 'draft' | 'public' | 'hidden' | 'takedown';
  verified: boolean;
  forkCount: number;
}

function PublishPanel({ serverId, serverStatus }: { serverId: string; serverStatus: string }) {
  const [title, setTitle] = useState('');
  const [category, setCategory] = useState('other');
  const [shortDescription, setShortDescription] = useState('');
  const [longDescription, setLongDescription] = useState('');
  const [secretHints, setSecretHints] = useState<SecretHint[]>([]);
  const [state, setState] = useState<'idle' | 'submitting' | 'success' | 'error'>('idle');
  const [error, setError] = useState<string | null>(null);
  const [publishedSlug, setPublishedSlug] = useState<string | null>(null);

  const [existing, setExisting] = useState<ExistingTemplate | null | undefined>(undefined);

  async function reloadExisting() {
    try {
      const r = await apiFetch<{ template: ExistingTemplate | null }>(
        `/v1/servers/${serverId}/template`,
      );
      setExisting(r.template);
    } catch {
      setExisting(null);
    }
  }

  useEffect(() => {
    reloadExisting();
  }, [serverId]);

  async function toggleVisibility(shared: boolean) {
    if (!existing) return;
    await apiFetch(`/v1/templates/${existing.slug}/visibility`, {
      method: 'PATCH',
      body: JSON.stringify({ shared }),
    });
    reloadExisting();
  }

  if (serverStatus !== 'live') {
    return (
      <div className="panel p-4">
        <p className="text-[13px] text-[--color-fg-muted]">
          Server must be live before publishing as a template. Current status:{' '}
          <span className="mono">{serverStatus}</span>.
        </p>
      </div>
    );
  }

  // Already published — show shared status + view + unshare/reshare.
  if (existing) {
    const isTakedown = existing.status === 'takedown';
    const isShared = existing.status === 'public';
    return (
      <div className="panel p-4">
        <div className="flex items-baseline justify-between">
          <h3 className="text-[14px] font-semibold tracking-tight">Marketplace</h3>
          <span
            className={`mono rounded-full border px-2 py-0.5 text-[11px] ${
              isTakedown
                ? 'border-red-400/40 bg-red-400/10 text-red-300'
                : isShared
                  ? 'border-emerald-400/40 bg-emerald-400/10 text-emerald-300'
                  : 'border-amber-400/40 bg-amber-400/10 text-amber-300'
            }`}
          >
            {existing.status}
          </span>
        </div>
        <p className="mt-1 text-[12.5px] text-[--color-fg-muted]">
          Published as <span className="mono">{existing.slug}</span> ·{' '}
          {existing.forkCount} fork{existing.forkCount === 1 ? '' : 's'}
          {existing.verified && ' · verified'}
        </p>
        {isTakedown && (
          <p className="mt-2 text-[12px] text-[--color-danger]">
            An admin removed this template from the marketplace. You can&apos;t re-share it.
          </p>
        )}
        <div className="mt-3 flex gap-2">
          <a
            href={`/templates/${existing.slug}`}
            target="_blank"
            rel="noreferrer"
            className="inline-flex h-8 items-center rounded-md border border-[--color-border] bg-[--color-bg-elevated] px-3 text-[12.5px] text-[--color-fg] transition-colors hover:bg-[--color-bg-subtle]"
          >
            View in marketplace
          </a>
          {!isTakedown && isShared && (
            <Button variant="danger" size="md" onClick={() => toggleVisibility(false)}>
              Unshare
            </Button>
          )}
          {!isTakedown && !isShared && (
            <Button variant="primary" size="md" onClick={() => toggleVisibility(true)}>
              Re-share
            </Button>
          )}
        </div>
      </div>
    );
  }

  if (existing === undefined) {
    return <div className="panel p-4 text-[12.5px] text-[--color-fg-muted]">Loading…</div>;
  }

  function addHint() {
    setSecretHints((h) => [...h, { key: '', description: '', howToGetUrl: '' }]);
  }
  function updateHint(i: number, patch: Partial<SecretHint>) {
    setSecretHints((h) => {
      const next = [...h];
      const cur = next[i];
      if (!cur) return h;
      next[i] = { ...cur, ...patch };
      return next;
    });
  }
  function removeHint(i: number) {
    setSecretHints((h) => h.filter((_, j) => j !== i));
  }

  async function submit() {
    setError(null);
    if (title.length < 3) {
      setError('Title needs at least 3 characters.');
      return;
    }
    if (shortDescription.length < 10) {
      setError('Short description needs at least 10 characters.');
      return;
    }
    // Validate secret hints
    for (const h of secretHints) {
      if (!h.key) {
        setError('Empty secret key — remove the row or fill it in.');
        return;
      }
      if (!/^[A-Z][A-Z0-9_]*$/.test(h.key)) {
        setError(`Secret key "${h.key}" must be UPPER_SNAKE_CASE.`);
        return;
      }
      if (h.description.length < 1) {
        setError(`Add a description for ${h.key}.`);
        return;
      }
    }

    setState('submitting');
    try {
      const res = await apiFetch<{ template: { slug: string } }>('/v1/templates', {
        method: 'POST',
        body: JSON.stringify({
          serverId,
          title,
          category,
          shortDescription,
          longDescription: longDescription || undefined,
          secretHints: secretHints.map((h) => ({
            key: h.key,
            description: h.description,
            ...(h.howToGetUrl ? { howToGetUrl: h.howToGetUrl } : {}),
          })),
        }),
      });
      setPublishedSlug(res.template.slug);
      setState('success');
    } catch (e) {
      const detail = (e as { detail?: { error?: string; detail?: string } }).detail;
      setError(detail?.detail ?? detail?.error ?? (e as Error).message);
      setState('error');
    }
  }

  if (state === 'success' && publishedSlug) {
    return (
      <div className="panel p-4">
        <div className="text-[14px] font-semibold tracking-tight">Published 🎉</div>
        <p className="mt-2 text-[12.5px] text-[--color-fg-muted]">
          Your template is live on the marketplace.
        </p>
        <div className="mt-3 flex gap-2">
          <a
            href={`/templates/${publishedSlug}`}
            className="inline-flex h-8 items-center rounded-md bg-[--color-accent] px-3 text-[12.5px] font-medium text-white transition-colors hover:bg-[#5557e8]"
          >
            Open in marketplace →
          </a>
        </div>
      </div>
    );
  }

  return (
    <div className="panel p-4 space-y-4">
      <div>
        <h3 className="text-[14px] font-semibold tracking-tight">Publish as template</h3>
        <p className="mt-1 text-[12px] text-[--color-fg-muted]">
          Share this server&apos;s spec on the public marketplace. Others fork in one click — they
          run their own container with their own credentials. Your secrets are never shared.
        </p>
        <p className="mt-2 rounded-md border border-amber-400/30 bg-amber-400/5 p-2 text-[11.5px] text-amber-200/90">
          Publishing re-scans your generated code for banned patterns (eval, child_process,
          dynamic import, setTimeout-eval) AND for hardcoded credentials (API keys, tokens,
          private keys). Templates with detected leaks are rejected before they reach the
          marketplace. Network egress allowlisting is on the roadmap — for now any template
          can reach any URL its code names.
        </p>
      </div>

      <div className="grid gap-3 md:grid-cols-[1fr_220px]">
        <div className="space-y-1.5">
          <Label htmlFor="t-title">Title</Label>
          <Input
            id="t-title"
            value={title}
            onChange={(e) => setTitle(e.target.value)}
            placeholder="Notion Reader"
            maxLength={128}
          />
        </div>
        <div className="space-y-1.5">
          <Label htmlFor="t-cat">Category</Label>
          <select
            id="t-cat"
            value={category}
            onChange={(e) => setCategory(e.target.value)}
            className="h-8 w-full rounded-md border border-[--color-border] bg-[--color-bg-subtle] px-2.5 text-[13px] focus:border-[--color-accent] focus:outline-none"
          >
            {CATEGORIES.map((c) => (
              <option key={c} value={c}>
                {c}
              </option>
            ))}
          </select>
        </div>
      </div>

      <div className="space-y-1.5">
        <Label htmlFor="t-short" hint={`${shortDescription.length}/280`}>
          Short description
        </Label>
        <Input
          id="t-short"
          value={shortDescription}
          onChange={(e) => setShortDescription(e.target.value)}
          placeholder="Search and read pages from a Notion workspace."
          maxLength={280}
        />
      </div>

      <div className="space-y-1.5">
        <Label htmlFor="t-long">Long description (optional)</Label>
        <Textarea
          id="t-long"
          rows={4}
          value={longDescription}
          onChange={(e) => setLongDescription(e.target.value)}
          placeholder="What does it do, what doesn't it do, what should the user know before forking?"
        />
      </div>

      <div className="space-y-2">
        <Label hint="Help future users understand which credentials they need and where to get them">
          Credential hints
        </Label>
        {secretHints.length === 0 && (
          <p className="text-[11.5px] text-[--color-fg-muted]">
            None. This server doesn&apos;t need any credentials.
          </p>
        )}
        {secretHints.map((h, i) => (
          <div key={i} className="panel-subtle p-2.5 space-y-2">
            <div className="grid grid-cols-[200px_1fr_auto] gap-2">
              <Input
                placeholder="NOTION_API_KEY"
                value={h.key}
                onChange={(e) => updateHint(i, { key: e.target.value.toUpperCase() })}
                className="mono"
              />
              <Input
                placeholder="What is this credential? One sentence."
                value={h.description}
                onChange={(e) => updateHint(i, { description: e.target.value })}
              />
              <Button variant="ghost" size="md" onClick={() => removeHint(i)}>
                Remove
              </Button>
            </div>
            <Input
              placeholder="https://notion.so/my-integrations (optional 'How to get one' link)"
              value={h.howToGetUrl}
              onChange={(e) => updateHint(i, { howToGetUrl: e.target.value })}
            />
          </div>
        ))}
        <Button variant="ghost" size="sm" onClick={addHint}>
          + Add credential hint
        </Button>
      </div>

      {error && <p className="text-[12.5px] text-[--color-danger]">{error}</p>}

      <div className="flex items-center justify-between border-t border-[--color-border] pt-3">
        <p className="text-[11px] text-[--color-fg-subtle]">
          By publishing, you agree the generated code may be inspected by others.
        </p>
        <Button
          variant="primary"
          size="md"
          onClick={submit}
          disabled={state === 'submitting'}
        >
          {state === 'submitting' ? 'Publishing…' : 'Publish'}
        </Button>
      </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>
  );
}
