import { and, eq } from "drizzle-orm";
import { NextResponse } from "next/server";
import {
  fetchVip98kModelPresets,
  hasVip98kTextToImageMode,
  type Vip98kModelPreset,
} from "@/lib/ai/vip98k-models";
import { db } from "@/lib/db";
import {
  deleteAiModel,
  getAiModelsByProviderId,
  getAiProviderById,
} from "@/lib/db/queries";
import { aiModel, type AiModel } from "@/lib/db/schema";
import { requireAdmin } from "@/lib/middleware/admin";

export const runtime = "nodejs";
export const maxDuration = 300;

function summarizeByType(presets: Vip98kModelPreset[]) {
  return presets.reduce<Record<string, number>>((acc, preset) => {
    const type = String(preset.type || "model");
    acc[type] = (acc[type] || 0) + 1;
    return acc;
  }, {});
}

export async function GET(request: Request) {
  try {
    await requireAdmin();
    const { searchParams } = new URL(request.url);
    const providerId = String(searchParams.get("providerId") || "").trim();
    if (!providerId) {
      return NextResponse.json(
        { error: "Provider ID is required to fetch VIP98K catalog" },
        { status: 400 },
      );
    }

    const provider = await getAiProviderById({ id: providerId });
    if (!provider || provider.type !== "vip98k") {
      return NextResponse.json(
        { error: "Provider must be a VIP98K provider" },
        { status: 400 },
      );
    }

    const presets = await fetchVip98kModelPresets({
      baseURL: provider.baseUrl,
      apiKey: provider.apiKey,
    });
    return NextResponse.json({
      presets,
      counts: {
        total: presets.length,
        byType: summarizeByType(presets),
      },
    });
  } catch (error) {
    console.error("[VIP98K Models API] GET error:", error);
    return NextResponse.json(
      {
        error:
          error instanceof Error
            ? error.message
            : "Failed to fetch VIP98K models",
      },
      { status: 500 },
    );
  }
}

export async function POST(request: Request) {
  try {
    await requireAdmin();
    const body = await request.json();
    const providerId = String(body?.providerId || "").trim();
    const requestedModelIds = Array.isArray(body?.modelIds)
      ? new Set(
          body.modelIds.map((item: unknown) => String(item || "").trim()).filter(Boolean),
        )
      : null;
    if (!providerId) {
      return NextResponse.json({ error: "Provider ID is required" }, { status: 400 });
    }

    const provider = await getAiProviderById({ id: providerId });
    if (!provider || provider.type !== "vip98k") {
      return NextResponse.json(
        { error: "Provider must be a VIP98K provider" },
        { status: 400 },
      );
    }

    const catalogPresets = await fetchVip98kModelPresets({
      baseURL: provider.baseUrl,
      apiKey: provider.apiKey,
    });
    const presets = requestedModelIds
      ? catalogPresets.filter((preset) => requestedModelIds.has(preset.modelId))
      : catalogPresets;

    const addedModels: AiModel[] = [];
    const updatedModels: AiModel[] = [];
    const removedModels: AiModel[] = [];
    const errors: Array<{ modelId: string; error: string }> = [];

    const existingModels = await getAiModelsByProviderId({ providerId });
    const textToImageModels = existingModels.filter(
      (model) =>
        model.supportsImageGen &&
        hasVip98kTextToImageMode({
          modelId: model.modelId,
          capabilities: model.capabilities,
          defaultParams: model.defaultParams,
        }),
    );
    for (const model of textToImageModels) {
      try {
        const deleted = await deleteAiModel({ id: model.id });
        removedModels.push(...deleted);
      } catch (error) {
        console.error(
          `[VIP98K Models API] Failed to remove text-to-image model ${model.modelId}:`,
          error,
        );
        errors.push({
          modelId: model.modelId,
          error: error instanceof Error ? error.message : "Removal failed",
        });
      }
    }

    for (const preset of presets) {
      try {
        const existing = await db.query.aiModel.findFirst({
          where: and(
            eq(aiModel.providerId, providerId),
            eq(aiModel.modelId, preset.modelId),
          ),
        });
        const values = {
          displayName: preset.displayName,
          avatarUrl: null,
          description: preset.description,
          supportsVision: preset.supportsVision,
          supportsImageGen: preset.supportsImageGen,
          isEnabled: true,
          isHidden: preset.isHidden,
          sortOrder: preset.sortOrder,
          capabilities: preset.capabilities,
          defaultParams: preset.defaultParams,
          imageGenConfig: preset.imageGenConfig,
          updatedAt: new Date(),
        };

        if (existing) {
          const [updated] = await db
            .update(aiModel)
            .set(values)
            .where(
              and(
                eq(aiModel.providerId, providerId),
                eq(aiModel.modelId, preset.modelId),
              ),
            )
            .returning();
          if (updated) updatedModels.push(updated);
        } else {
          const [created] = await db
            .insert(aiModel)
            .values({
              providerId,
              modelId: preset.modelId,
              ...values,
              isDefault: false,
              isSubModel: false,
              parentModelId: null,
            })
            .returning();
          if (created) addedModels.push(created);
        }
      } catch (error) {
        console.error(`[VIP98K Models API] Failed to sync ${preset.modelId}:`, error);
        errors.push({
          modelId: preset.modelId,
          error: error instanceof Error ? error.message : "Sync failed",
        });
      }
    }

    return NextResponse.json({
      success: true,
      addedCount: addedModels.length,
      updatedCount: updatedModels.length,
      removedCount: removedModels.length,
      addedModels,
      updatedModels,
      removedModels,
      errors: errors.length > 0 ? errors : undefined,
      counts: {
        requested: presets.length,
        total: catalogPresets.length,
        byType: summarizeByType(catalogPresets),
      },
    });
  } catch (error) {
    console.error("[VIP98K Models API] POST error:", error);
    return NextResponse.json(
      {
        error:
          error instanceof Error
            ? error.message
            : "Failed to sync VIP98K models",
      },
      { status: 500 },
    );
  }
}