import { and, eq } from "drizzle-orm";
import { NextResponse } from "next/server";
import {
  fetchAtlasCloudModelPresets,
  resolveAtlasCloudDisplayName,
  shouldInsertMissingAtlasCloudPreset,
} from "@/lib/ai/atlascloud-models";
import { db } from "@/lib/db";
import { getAiProviderById } from "@/lib/db/queries";
import { type AiModel, aiModel } from "@/lib/db/schema";
import { requireAdmin } from "@/lib/middleware/admin";

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

export async function GET() {
  try {
    await requireAdmin();
    const result = await fetchAtlasCloudModelPresets();
    return NextResponse.json({
      presets: result.presets,
      errors: result.errors.length > 0 ? result.errors : undefined,
      counts: {
        total: result.catalogCount,
        available: result.presets.length,
        failed: result.errors.length,
      },
    });
  } catch (error) {
    console.error("[Atlas Cloud Models API] GET error:", error);
    return NextResponse.json(
      {
        error:
          error instanceof Error
            ? error.message
            : "Failed to fetch Atlas Cloud 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 !== "atlascloud") {
      return NextResponse.json(
        { error: "Provider must be an Atlas Cloud provider" },
        { status: 400 }
      );
    }

    const catalog = await fetchAtlasCloudModelPresets();
    const presets = requestedModelIds
      ? catalog.presets.filter((preset) => requestedModelIds.has(preset.modelId))
      : catalog.presets;
    const addedModels: AiModel[] = [];
    const updatedModels: AiModel[] = [];
    const errors = [...catalog.errors];
    const providerModels = await db.query.aiModel.findMany({
      where: eq(aiModel.providerId, providerId),
    });
    const existingByModelId = new Map(
      providerModels.map((model) => [model.modelId, model])
    );
    const existingMediaKinds = new Set(
      providerModels.map((model) => {
        const capabilities = model.capabilities as Record<string, unknown> | null;
        return String(capabilities?.mediaType || "image");
      })
    );
    let preservedDeletedCount = 0;

    for (const preset of presets) {
      try {
        const existing = existingByModelId.get(preset.modelId);
        const presetCapabilities = preset.capabilities as Record<string, unknown>;
        const mediaKind = String(presetCapabilities.mediaType || "image");
        if (
          !existing &&
          !shouldInsertMissingAtlasCloudPreset(existingMediaKinds, mediaKind)
        ) {
          preservedDeletedCount += 1;
          continue;
        }
        const values = {
          displayName: resolveAtlasCloudDisplayName(
            existing?.displayName,
            preset.displayName,
            preset.modelId
          ),
          avatarUrl: preset.avatarUrl || null,
          description: preset.description,
          supportsVision: preset.supportsVision,
          supportsImageGen: preset.supportsImageGen,
          sortOrder: existing?.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,
              isEnabled: true,
              isHidden: false,
              isDefault: false,
              isSubModel: false,
              parentModelId: null,
            })
            .returning();
          if (created) addedModels.push(created);
        }
      } catch (error) {
        console.error(
          `[Atlas Cloud 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,
      addedModels,
      updatedModels,
      errors: errors.length > 0 ? errors : undefined,
      counts: {
        requested: presets.length,
        total: catalog.catalogCount,
        available: catalog.presets.length,
        skippedUnsupported: catalog.skipped.length,
        preservedDeleted: preservedDeletedCount,
      },
    });
  } catch (error) {
    console.error("[Atlas Cloud Models API] POST error:", error);
    return NextResponse.json(
      {
        error:
          error instanceof Error
            ? error.message
            : "Failed to sync Atlas Cloud models",
      },
      { status: 500 }
    );
  }
}