/**
 * GET    /api/workspaces/[slug]/apps/[uuid]  — app details
 * PATCH  /api/workspaces/[slug]/apps/[uuid]  — update fields (name/branch/build config)
 * DELETE /api/workspaces/[slug]/apps/[uuid]?confirm=<name>
 *                                             — destroy app. Volumes kept by default.
 *
 * All verify the app's project uuid matches the workspace's before
 * acting. DELETE additionally requires `?confirm=<exact-resource-name>`
 * to prevent AI-driven accidents.
 */

import { NextResponse } from 'next/server';
import { requireWorkspacePrincipal } from '@/lib/auth/workspace-auth';
import {
  getApplicationInProject,
  projectUuidOf,
  TenantError,
  updateApplication,
  deleteApplication,
} from '@/lib/coolify';

export async function GET(
  request: Request,
  { params }: { params: Promise<{ slug: string; uuid: string }> }
) {
  const { slug, uuid } = 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 });
  }

  try {
    const app = await getApplicationInProject(uuid, ws.coolify_project_uuid);
    return NextResponse.json({
      uuid: app.uuid,
      name: app.name,
      status: app.status,
      fqdn: app.fqdn ?? null,
      domains: app.domains ?? null,
      gitRepository: app.git_repository ?? null,
      gitBranch: app.git_branch ?? null,
      projectUuid: projectUuidOf(app),
    });
  } catch (err) {
    if (err instanceof TenantError) {
      return NextResponse.json({ error: err.message }, { status: 403 });
    }
    return NextResponse.json(
      { error: 'Coolify request failed', details: err instanceof Error ? err.message : String(err) },
      { status: 502 }
    );
  }
}

export async function PATCH(
  request: Request,
  { params }: { params: Promise<{ slug: string; uuid: string }> }
) {
  const { slug, uuid } = 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 });
  }

  // Verify tenancy first (400-style fail fast on cross-tenant access).
  try {
    await getApplicationInProject(uuid, ws.coolify_project_uuid);
  } catch (err) {
    if (err instanceof TenantError) {
      return NextResponse.json({ error: err.message }, { status: 403 });
    }
    return NextResponse.json({ error: 'App not found' }, { status: 404 });
  }

  let body: Record<string, unknown> = {};
  try {
    body = await request.json();
  } catch {
    return NextResponse.json({ error: 'Invalid JSON body' }, { status: 400 });
  }

  // Whitelist which Coolify fields we expose to AI-level callers.
  // Domains are managed via the dedicated /domains subroute.
  const allowed = new Set([
    'name',
    'description',
    'git_branch',
    'build_pack',
    'ports_exposes',
    'install_command',
    'build_command',
    'start_command',
    'base_directory',
    'dockerfile_location',
    'is_auto_deploy_enabled',
    'is_force_https_enabled',
    'static_image',
  ]);
  const patch: Record<string, unknown> = {};
  for (const [k, v] of Object.entries(body)) {
    if (allowed.has(k) && v !== undefined) patch[k] = v;
  }
  if (Object.keys(patch).length === 0) {
    return NextResponse.json({ error: 'No updatable fields in body' }, { status: 400 });
  }

  try {
    await updateApplication(uuid, patch);
    return NextResponse.json({ ok: true, uuid });
  } catch (err) {
    return NextResponse.json(
      { error: 'Coolify update failed', details: err instanceof Error ? err.message : String(err) },
      { status: 502 }
    );
  }
}

export async function DELETE(
  request: Request,
  { params }: { params: Promise<{ slug: string; uuid: string }> }
) {
  const { slug, uuid } = 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 });
  }

  // Resolve the app and verify tenancy.
  let app;
  try {
    app = await getApplicationInProject(uuid, ws.coolify_project_uuid);
  } catch (err) {
    if (err instanceof TenantError) {
      return NextResponse.json({ error: err.message }, { status: 403 });
    }
    return NextResponse.json({ error: 'App not found' }, { status: 404 });
  }

  // Require `?confirm=<exact app name>` to prevent accidental destroys.
  const url = new URL(request.url);
  const confirm = url.searchParams.get('confirm');
  if (confirm !== app.name) {
    return NextResponse.json(
      {
        error: 'Confirmation required',
        hint: `Pass ?confirm=${app.name} to delete this app`,
      },
      { status: 409 }
    );
  }

  // Default: preserve volumes (user data). Caller can opt in.
  const deleteVolumes = url.searchParams.get('delete_volumes') === 'true';
  const deleteConfigurations = url.searchParams.get('delete_configurations') !== 'false';
  const deleteConnectedNetworks = url.searchParams.get('delete_connected_networks') !== 'false';
  const dockerCleanup = url.searchParams.get('docker_cleanup') !== 'false';

  try {
    await deleteApplication(uuid, {
      deleteConfigurations,
      deleteVolumes,
      deleteConnectedNetworks,
      dockerCleanup,
    });
    return NextResponse.json({ ok: true, deleted: { uuid, name: app.name, volumesKept: !deleteVolumes } });
  } catch (err) {
    return NextResponse.json(
      { error: 'Coolify delete failed', details: err instanceof Error ? err.message : String(err) },
      { status: 502 }
    );
  }
}