import { type PrismaClient, ServerType } from "@minikura/db";
import type { Server, CustomEnvironmentVariable } from "@minikura/db";
import { BaseController } from "./base-controller";
import type { ServerConfig } from "../types";
import { createServer, deleteServer } from "../resources/server";

type ServerWithEnvVars = Server & {
  env_variables: CustomEnvironmentVariable[];
};

export class ServerController extends BaseController {
  private deployedServers = new Map<string, ServerWithEnvVars>();

  constructor(prisma: PrismaClient, namespace: string) {
    super(prisma, namespace);
  }

  protected getControllerName(): string {
    return "ServerController";
  }

  protected async syncResources(): Promise<void> {
    try {
      const appsApi = this.k8sClient.getAppsApi();
      const coreApi = this.k8sClient.getCoreApi();
      const networkingApi = this.k8sClient.getNetworkingApi();

      const servers = (await this.prisma.server.findMany({
        include: {
          env_variables: true,
        },
      })) as ServerWithEnvVars[];

      const currentServerIds = new Set(servers.map((server) => server.id));

      // Delete servers that are no longer in the database
      for (const [serverId, server] of this.deployedServers.entries()) {
        if (!currentServerIds.has(serverId)) {
          console.log(
            `Server ${server.id} (${serverId}) has been removed from the database, deleting from Kubernetes...`
          );
          await deleteServer(serverId, appsApi, coreApi, this.namespace);
          this.deployedServers.delete(serverId);
        }
      }

      // Create or update servers that are in the database
      for (const server of servers) {
        const deployedServer = this.deployedServers.get(server.id);

        // If server doesn't exist yet or has been updated
        if (!deployedServer || this.hasServerChanged(deployedServer, server)) {
          console.log(
            `${!deployedServer ? "Creating" : "Updating"} server ${server.id} (${server.id}) in Kubernetes...`
          );

          const serverConfig: ServerConfig = {
            id: server.id,
            type: server.type,
            apiKey: server.api_key,
            description: server.description,
            listen_port: server.listen_port,
            memory: server.memory,
            env_variables: server.env_variables?.map((ev) => ({
              key: ev.key,
              value: ev.value,
            })),
          };

          await createServer(serverConfig, appsApi, coreApi, networkingApi, this.namespace);

          // Update cache
          this.deployedServers.set(server.id, { ...server });
        }
      }
    } catch (error) {
      console.error("Error syncing servers:", error);
      throw error;
    }
  }

  private hasServerChanged(oldServer: ServerWithEnvVars, newServer: ServerWithEnvVars): boolean {
    // Check basic properties
    const basicPropsChanged =
      oldServer.type !== newServer.type ||
      oldServer.listen_port !== newServer.listen_port ||
      oldServer.description !== newServer.description;

    if (basicPropsChanged) return true;

    // Check if environment variables have changed
    const oldEnvVars = oldServer.env_variables || [];
    const newEnvVars = newServer.env_variables || [];

    // Check if the number of env vars has changed
    if (oldEnvVars.length !== newEnvVars.length) return true;

    // Check if any of the existing env vars have changed
    for (const newEnv of newEnvVars) {
      const oldEnv = oldEnvVars.find((e) => e.key === newEnv.key);
      if (!oldEnv || oldEnv.value !== newEnv.value) {
        return true;
      }
    }

    return false;
  }
}