import { NextRequest, NextResponse } from 'next/server';
import { z } from 'zod';
import { getCurrentUser } from '@/lib/auth';
import { prisma } from '@/lib/prisma';
import { activate } from '@/lib/ai/activateConfig';
import { isCustomUrlProvider } from '@/lib/ai/providers';

/**
 * v1.1.0:4 — Multi-config CRUD.
 *
 * GET  /api/ai/configs       List the actor's saved AI configs +
 *                            their active id. apiKey is REDACTED in
 *                            list output (only `keyConfigured: bool`).
 * POST /api/ai/configs       Create a new config. Pass `setActive: true`
 *                            to also activate it.
 *
 * Per-row endpoints in [id]/route.ts. "Activate" is its own POST in
 * [id]/activate/route.ts so the action is explicit + auditable.
 */

const PROVIDERS = [
  'claude',
  'openai',
  'openai-compatible',
  'gemini',
  'ollama',
  'sparkcontrol',
] as const;

export async function GET() {
  const user = await getCurrentUser();
  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

  const [profiles, prefs] = await Promise.all([
    prisma.aIConfigProfile.findMany({
      where: { userId: user.id },
      orderBy: { createdAt: 'asc' },
      select: {
        id: true,
        name: true,
        provider: true,
        model: true,
        baseUrl: true,
        apiKey: true, // pulled only to compute keyConfigured; never returned
        createdAt: true,
      },
    }),
    prisma.userPreferences.findUnique({
      where: { userId: user.id },
      select: { activeAIConfigId: true },
    }),
  ]);

  return NextResponse.json({
    activeId: prefs?.activeAIConfigId ?? null,
    configs: profiles.map((p) => ({
      id: p.id,
      name: p.name,
      provider: p.provider,
      model: p.model,
      baseUrl: p.baseUrl,
      keyConfigured: !!p.apiKey,
      createdAt: p.createdAt.toISOString(),
    })),
  });
}

const createSchema = z.object({
  name: z.string().min(1).max(80).optional(),
  provider: z.enum(PROVIDERS),
  model: z.string().min(1).max(200),
  baseUrl: z.string().url().nullable().optional().or(z.literal('')),
  apiKey: z.string().nullable().optional(),
  setActive: z.boolean().optional(),
});

export async function POST(request: NextRequest) {
  const user = await getCurrentUser();
  if (!user) return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });

  const body = await request.json().catch(() => ({}));
  const parsed = createSchema.safeParse(body);
  if (!parsed.success) {
    return NextResponse.json(
      { error: 'Invalid body', details: parsed.error.errors },
      { status: 400 },
    );
  }

  const { name, provider, model, baseUrl, apiKey, setActive } = parsed.data;

  // Custom-URL providers (Ollama, SparkControl, OpenAI-compatible) are
  // admin-only — a non-admin pointing the server at an arbitrary URL is the
  // SSRF actor vector. Fixed-URL cloud providers stay per-user.
  if (!user.isAdmin && (baseUrl || isCustomUrlProvider(provider))) {
    return NextResponse.json(
      {
        error:
          'Only an admin can configure providers with a custom base URL (Ollama, SparkControl, OpenAI-compatible).',
      },
      { status: 403 },
    );
  }

  // Only custom-URL providers (Ollama / OpenAI-compatible / SparkControl) carry
  // a base URL. Fixed-URL providers (claude/openai/gemini) hit their hardcoded
  // endpoint and ignore it — so we drop any stale baseUrl here rather than
  // storing an impossible config (the footgun behind the gemini-with-a-baseURL
  // mismatch). The UI also clears the field on provider change.
  const normalizedBaseUrl = isCustomUrlProvider(provider) ? baseUrl || null : null;

  const profile = await prisma.aIConfigProfile.create({
    data: {
      userId: user.id,
      name: name ?? defaultName(provider, model),
      provider,
      model,
      baseUrl: normalizedBaseUrl,
      apiKey: apiKey || null,
    },
  });

  if (setActive) {
    await activate(user.id, profile.id, {
      provider,
      model,
      baseUrl: normalizedBaseUrl,
      apiKey,
    });
  }

  return NextResponse.json({
    id: profile.id,
    name: profile.name,
    provider: profile.provider,
    model: profile.model,
    baseUrl: profile.baseUrl,
    keyConfigured: !!profile.apiKey,
    activated: !!setActive,
  });
}

function defaultName(provider: string, model: string): string {
  const PRETTY: Record<string, string> = {
    claude: 'Claude',
    openai: 'OpenAI',
    'openai-compatible': 'Custom',
    gemini: 'Gemini',
    ollama: 'Ollama',
    sparkcontrol: 'SparkControl',
  };
  const label = PRETTY[provider] ?? provider;
  return `${label} · ${model}`;
}