import { PublicKey, TransactionInstruction } from "@solana/web3.js";
import { PythCluster } from "@pythnetwork/client";
import {
  ValidationResult,
  DownloadableProduct,
  DownloadableConfig,
  ProgramType,
} from "../types";

/**
 * Program ID for the Pyth Lazer program
 */
export const LAZER_PROGRAM_ID = new PublicKey(
  "pytd2yyk641x7ak7mkaasSJVXh6YYZnC7wTmtgAyxPt",
);

/**
 * Lazer-specific configuration type
 * TODO: Change to actual Lazer config type
 */
export type LazerConfig = {
  programType: ProgramType.PYTH_LAZER;
  // Make cluster optional since Lazer might not be tied to a specific cluster
  cluster?: PythCluster;
  // More generic data source instead of Solana-specific accounts
  feeds: LazerFeed[];
  // Additional metadata that might be relevant for Lazer
  metadata?: Record<string, unknown>;
};

/**
 * Parameters for getting Lazer configuration
 */
export type LazerConfigParams = {
  // Instead of requiring Solana accounts, allow any parameters needed
  endpoint?: string;
  network?: string;
  options?: Record<string, unknown>;
};

/**
 * Lazer program instruction accounts needed for generateInstructions
 */
export interface LazerInstructionAccounts {
  fundingAccount: PublicKey;
  // Lazer-specific properties
  lazerProgramClient?: any; // Replace with proper type when available
  cluster: PythCluster;
  additionalAccounts?: Record<string, PublicKey>;
}

/**
 * Lazer feed configuration
 * TODO: Change to actual Lazer feed type
 */
export type LazerFeed = {
  id: string;
  metadata: Record<string, string | number | boolean>;
  // Add other feed-specific properties as needed
};

/**
 * Check if the Pyth Lazer program is available on the specified cluster
 *
 * @param cluster The Pyth cluster to check
 * @returns True if the program is available on the cluster
 */
export function isAvailableOnCluster(cluster: PythCluster): boolean {
  return (
    cluster === "pythnet" ||
    cluster === "mainnet-beta" ||
    cluster === "devnet" ||
    cluster === "testnet"
  );
}

/**
 * Get configuration for Lazer program
 *
 * @param params Parameters to fetch Lazer configuration
 * @returns Promise resolving to Lazer-specific configuration object
 */
export function getConfig(params: LazerConfigParams): LazerConfig {
  // Extract the properties
  const { endpoint, network, options } = params;

  // Example implementation that would fetch data from a non-Solana source
  // For now, return a placeholder with empty feeds

  // In a real implementation, this might:
  // 1. Connect to a REST API endpoint
  // 2. Query a database
  // 3. Read from a file
  // 4. Or even call a different blockchain's RPC

  // Simulating some async operation
  return {
    programType: ProgramType.PYTH_LAZER,
    // Include cluster if provided in options
    cluster: options?.cluster as PythCluster | undefined,
    feeds: [],
    metadata: {
      source: endpoint ?? "unknown",
      network: network ?? "unknown",
    },
  };
}

/**
 * Format the configuration for downloading as a JSON file
 *
 * @param config The program's configuration object
 * @returns Configuration formatted for download
 */
export function getDownloadableConfig(config: LazerConfig): DownloadableConfig {
  return Object.fromEntries(
    config.feeds.map((feed) => [
      feed.id,
      {
        address: "",
        metadata: {
          symbol: feed.id,
          asset_type: feed.metadata.asset_type?.toString() ?? "",
          country: feed.metadata.country?.toString() ?? "",
          quote_currency: feed.metadata.quote_currency?.toString() ?? "",
          tenor: feed.metadata.tenor?.toString() ?? "",
        },
        priceAccounts: [
          {
            address: "",
            publishers: [],
            expo: 0,
            minPub: 0,
            maxLatency: 0,
          },
        ],
      },
    ]),
  );
}

/**
 * Validate an uploaded configuration against the current configuration
 *
 * @param existingConfig Current configuration
 * @param uploadedConfig Configuration from an uploaded file
 * @param cluster The Pyth cluster the configuration is for
 * @returns Object with validation result and optional error message
 */
export function validateUploadedConfig(
  existingConfig: DownloadableConfig,
  uploadedConfig: unknown,
  cluster: PythCluster,
): ValidationResult {
  // Basic validation logic for Lazer config
  try {
    if (typeof uploadedConfig !== "object" || uploadedConfig === null) {
      return {
        isValid: false,
        error: "Invalid JSON format for Lazer configuration",
      };
    }

    // More detailed validation would be implemented here
    // For now, return not implemented error
    return {
      isValid: false,
      error: "Uploading configuration for Pyth Lazer is not yet supported",
    };
  } catch (error) {
    return {
      isValid: false,
      error:
        error instanceof Error ? error.message : "Unknown validation error",
    };
  }
}

/**
 * Generate the necessary instructions to apply configuration changes
 *
 * @param changes Configuration changes to apply
 * @param cluster The Pyth cluster where the changes will be applied
 * @param accounts Additional context needed for generating instructions
 * @returns Promise resolving to an array of TransactionInstructions
 */
export async function generateInstructions(
  changes: Record<
    string,
    {
      prev?: Partial<DownloadableProduct>;
      new?: Partial<DownloadableProduct>;
    }
  >,
  cluster: PythCluster,
  accounts: LazerInstructionAccounts,
): Promise<TransactionInstruction[]> {
  // Simple placeholder implementation that returns an empty array of instructions
  // In a real implementation, this would transform the changes into Lazer-specific instructions

  // Example of how this might be implemented:
  // 1. For each change, determine if it's an add, update, or delete operation
  // 2. Map the DownloadableProduct format to Lazer-specific data structure
  // 3. Generate appropriate Lazer instructions based on the operation type

  return [];
}
