/**
 * Workspace authentication providers.
 *
 * GET  /api/workspaces/[slug]/auth — list auth-provider services
 * POST /api/workspaces/[slug]/auth — provision one of the vetted providers
 *
 * AI-callers can only create providers from an allowlist — we deliberately
 * skip the rest of Coolify's ~300 one-click templates so this endpoint
 * stays focused on "auth for my app". The allowlist:
 *
 *   pocketbase                    — lightweight (SQLite-backed) auth + data
 *   authentik                     — feature-rich self-hosted IDP
 *   keycloak                      — industry-standard OIDC/SAML
 *   keycloak-with-postgres
 *   pocket-id                     — passkey-first OIDC
 *   pocket-id-with-postgresql
 *   logto                         — dev-first IDP
 *   supertokens-with-postgresql   — session/auth backend
 *
 * (Zitadel is not on Coolify's service catalog — callers that ask for
 * it get a descriptive 400 so the AI knows to pick a supported one.)
 *
 * POST body:
 *   { provider: "pocketbase", name?: "auth" }
 */

import { NextResponse } from 'next/server';
import { requireWorkspacePrincipal } from '@/lib/auth/workspace-auth';
import {
  listServicesInProject,
  createService,
  getService,
  projectUuidOf,
} from '@/lib/coolify';
import { slugify } from '@/lib/naming';

/**
 * Vetted auth-provider service ids. Keys are what callers pass as
 * `provider`; values are the Coolify service-template slugs.
 */
const AUTH_PROVIDERS: Record<string, string> = {
  pocketbase: 'pocketbase',
  authentik: 'authentik',
  keycloak: 'keycloak',
  'keycloak-with-postgres': 'keycloak-with-postgres',
  'pocket-id': 'pocket-id',
  'pocket-id-with-postgresql': 'pocket-id-with-postgresql',
  logto: 'logto',
  'supertokens-with-postgresql': 'supertokens-with-postgresql',
};

/** Anything in this set is Coolify-supported but not an auth provider (used for filtering the list view). */
const AUTH_PROVIDER_SLUGS = new Set(Object.values(AUTH_PROVIDERS));

export async function GET(
  request: Request,
  { params }: { params: Promise<{ slug: string }> }
) {
  const { slug } = await params;
  const principal = await requireWorkspacePrincipal(request, { targetSlug: slug });
  if (principal instanceof NextResponse) return principal;

  const ws = principal.workspace;
  if (!ws.coolify_project_uuid) {
    return NextResponse.json(
      { error: 'Workspace has no Coolify project yet', providers: [] },
      { status: 503 }
    );
  }

  try {
    const all = await listServicesInProject(ws.coolify_project_uuid);
    // Coolify's list endpoint only returns summaries (no service_type) so
    // we fetch each service individually to classify it by template slug.
    // This is O(n) in services-per-workspace — acceptable at single-digit
    // scales — and avoids name-based heuristics that break on custom names.
    const detailed = await Promise.all(all.map(s => getService(s.uuid).catch(() => s)));
    return NextResponse.json({
      workspace: { slug: ws.slug, coolifyProjectUuid: ws.coolify_project_uuid },
      providers: detailed
        .filter(s => {
          const t = resolveProviderSlug(s);
          return !!t && AUTH_PROVIDER_SLUGS.has(t);
        })
        .map(s => ({
          uuid: s.uuid,
          name: s.name,
          status: s.status ?? null,
          provider: resolveProviderSlug(s),
          projectUuid: projectUuidOf(s),
        })),
      allowedProviders: Object.keys(AUTH_PROVIDERS),
    });
  } catch (err) {
    return NextResponse.json(
      { error: 'Coolify request failed', details: err instanceof Error ? err.message : String(err) },
      { status: 502 }
    );
  }
}

export async function POST(
  request: Request,
  { params }: { params: Promise<{ slug: string }> }
) {
  const { slug } = await params;
  const principal = await requireWorkspacePrincipal(request, { targetSlug: slug });
  if (principal instanceof NextResponse) return principal;

  const ws = principal.workspace;
  if (!ws.coolify_project_uuid) {
    return NextResponse.json({ error: 'Workspace has no Coolify project yet' }, { status: 503 });
  }

  let body: { provider?: string; name?: string; description?: string; instantDeploy?: boolean } = {};
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 });
  }

  const providerKey = (body.provider ?? '').toLowerCase().trim();
  const coolifyType = AUTH_PROVIDERS[providerKey];
  if (!coolifyType) {
    return NextResponse.json(
      {
        error: `Unsupported provider "${providerKey}". Allowed: ${Object.keys(AUTH_PROVIDERS).join(', ')}`,
        hint: 'Zitadel is not on Coolify v4 service catalog — use keycloak or authentik instead.',
      },
      { status: 400 }
    );
  }

  const name = slugify(body.name ?? providerKey);

  try {
    const created = await createService({
      projectUuid: ws.coolify_project_uuid,
      type: coolifyType,
      name,
      description: body.description ?? `AI-provisioned ${providerKey} for ${ws.slug}`,
      serverUuid: ws.coolify_server_uuid ?? undefined,
      environmentName: ws.coolify_environment_name,
      destinationUuid: ws.coolify_destination_uuid ?? undefined,
      instantDeploy: body.instantDeploy ?? true,
    });

    const svc = await getService(created.uuid);
    return NextResponse.json(
      {
        uuid: svc.uuid,
        name: svc.name,
        provider: providerKey,
        status: svc.status ?? null,
      },
      { status: 201 }
    );
  } catch (err) {
    return NextResponse.json(
      { error: 'Coolify create failed', details: err instanceof Error ? err.message : String(err) },
      { status: 502 }
    );
  }
}

/**
 * Authoritative: Coolify stores the template slug on `service_type`.
 * Fall back to a name-prefix match so services created before that field
 * existed still classify correctly.
 */
function resolveProviderSlug(svc: { name: string; service_type?: string }): string {
  if (svc.service_type && AUTH_PROVIDER_SLUGS.has(svc.service_type)) return svc.service_type;
  const candidates = Object.values(AUTH_PROVIDERS).sort((a, b) => b.length - a.length);
  for (const slug of candidates) {
    if (svc.name === slug || svc.name.startsWith(`${slug}-`) || svc.name.startsWith(`${slug}_`)) {
      return slug;
    }
  }
  return '';
}