package cc.unitmesh.xiuper.fs.mcp

import cc.unitmesh.xiuper.fs.*
import io.modelcontextprotocol.kotlin.sdk.client.Client

/**
 * Android implementation of MCP Backend.
 * Uses the MCP SDK which supports Android.
 */
actual interface McpBackend : FsBackend {
    actual val isAvailable: Boolean
    val mcpClient: Client
}

/**
 * Android MCP backend implementation.
 * Provides its own implementation since we can't reference JvmMcpBackend directly.
 */
class AndroidMcpBackend(
    override val mcpClient: Client
) : McpBackend {
    override val isAvailable: Boolean = true
    
    override suspend fun stat(path: FsPath): FsStat {
        return when {
            path.value == "/" || path.value == "/resources" || path.value == "/tools" -> 
                FsStat(path, isDirectory = true)
            else -> throw FsException(FsErrorCode.ENOENT, "Path not found: ${path.value}")
        }
    }
    
    override suspend fun list(path: FsPath): List<FsEntry> {
        return when (path.value) {
            "/" -> listOf(
                FsEntry.Directory("resources"),
                FsEntry.Directory("tools")
            )
            else -> emptyList()
        }
    }
    
    override suspend fun read(path: FsPath, options: ReadOptions): ReadResult {
        throw FsException(FsErrorCode.ENOTSUP, "MCP read not implemented for Android yet")
    }
    
    override suspend fun write(path: FsPath, content: ByteArray, options: WriteOptions): WriteResult {
        throw FsException(FsErrorCode.ENOTSUP, "MCP write not implemented for Android yet")
    }
    
    override suspend fun delete(path: FsPath) {
        throw FsException(FsErrorCode.EACCES, "Delete not supported for MCP resources")
    }
    
    override suspend fun mkdir(path: FsPath) {
        throw FsException(FsErrorCode.EACCES, "Create directory not supported for MCP resources")
    }
}

/**
 * Create an Android MCP backend.
 */
actual suspend fun createMcpBackend(serverConfig: McpServerConfig): McpBackend? {
    return try {
        // TODO: Implement actual MCP client creation for Android
        null // Placeholder for now
    } catch (e: Exception) {
        null
    }
}