import Foundation

class IOBridge: NSObject {
    private let jsonEncoder: JSONEncoder
    private let jsonDecoder: JSONDecoder
    private let accessibilityService: AccessibilityService
    private let audioService: AudioService
    private let dateFormatter: DateFormatter

    init(jsonEncoder: JSONEncoder, jsonDecoder: JSONDecoder) {
        self.jsonEncoder = jsonEncoder
        self.jsonDecoder = jsonDecoder
        self.accessibilityService = AccessibilityService()
        self.audioService = AudioService()  // Audio preloaded here at startup
        self.dateFormatter = DateFormatter()
        self.dateFormatter.dateFormat = "yyyy-MM-dd HH:mm:ss.SSS"
        super.init()
    }

    private func logToStderr(_ message: String) {
        let timestamp = dateFormatter.string(from: Date())
        let logMessage = "[\(timestamp)] \(message)\n"
        FileHandle.standardError.write(logMessage.data(using: .utf8)!)
    }

    // Handles a single RPC Request
    func handleRpcRequest(_ request: RPCRequestSchema) {
        var rpcResponse: RPCResponseSchema

        switch request.method {
        case .getAccessibilityTreeDetails:
            // Process accessibility tree requests on dedicated thread
            AccessibilityQueue.shared.async { [weak self] in
                guard let self = self else { return }
                self.handleAccessibilityTreeDetails(request)
            }
            return

        case .getAccessibilityContext:
            // Process accessibility context requests on dedicated thread
            AccessibilityQueue.shared.async { [weak self] in
                guard let self = self else { return }
                self.handleAccessibilityContext(request)
            }
            return

        case .pasteText:
            logToStderr("[IOBridge] Handling pasteText for ID: \(request.id)")
            guard let paramsAnyCodable = request.params else {
                let errPayload = Error(
                    code: -32602, data: nil, message: "Missing params for pasteText")
                rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
                sendRpcResponse(rpcResponse)
                return
            }

            do {
                let paramsData = try jsonEncoder.encode(paramsAnyCodable)
                // Corrected to use generated Swift model name from models.swift
                let pasteParams = try jsonDecoder.decode(
                    PasteTextParamsSchema.self, from: paramsData)
                logToStderr("[IOBridge] Decoded pasteParams.transcript for ID: \(request.id)")

                // Call the actual paste function (to be implemented in AccessibilityService or similar)
                let success = accessibilityService.pasteText(transcript: pasteParams.transcript)

                // Corrected to use generated Swift model name from models.swift
                let resultPayload = PasteTextResultSchema(
                    message: success ? "Pasted successfully" : "Paste failed", success: success)
                let resultData = try jsonEncoder.encode(resultPayload)
                let resultAsJsonAny = try jsonDecoder.decode(JSONAny.self, from: resultData)
                rpcResponse = RPCResponseSchema(error: nil, id: request.id, result: resultAsJsonAny)

            } catch {
                logToStderr(
                    "[IOBridge] Error processing pasteText params or operation: \(error.localizedDescription) for ID: \(request.id)"
                )
                let errPayload = Error(
                    code: -32602, data: request.params,
                    message: "Invalid params or error during paste: \(error.localizedDescription)")
                rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
            }

        case .muteSystemAudio:
            logToStderr("[IOBridge] Handling muteSystemAudio for ID: \(request.id)")

            audioService.playSound(named: "rec-start") { [weak self] in
                guard let self = self else {
                    let timestamp = DateFormatter().string(from: Date())
                    let logMessage =
                        "[\(timestamp)] [IOBridge] self is nil in playSound completion for muteSystemAudio. ID: \(request.id)\n"
                    FileHandle.standardError.write(logMessage.data(using: .utf8)!)
                    return
                }

                self.logToStderr(
                    "[IOBridge] rec-start.mp3 finished playing successfully. Proceeding to mute system audio. ID: \(request.id)"
                )
                let success = self.accessibilityService.muteSystemAudio()
                let resultPayload = MuteSystemAudioResultSchema(
                    message: success ? "Mute command sent" : "Failed to send mute command",
                    success: success)

                var responseToSend: RPCResponseSchema
                do {
                    let resultData = try self.jsonEncoder.encode(resultPayload)
                    let resultAsJsonAny = try self.jsonDecoder.decode(
                        JSONAny.self, from: resultData)
                    responseToSend = RPCResponseSchema(
                        error: nil, id: request.id, result: resultAsJsonAny)
                } catch {
                    self.logToStderr(
                        "[IOBridge] Error encoding muteSystemAudio result: \(error.localizedDescription) for ID: \(request.id)"
                    )
                    let errPayload = Error(
                        code: -32603, data: nil,
                        message: "Error encoding result: \(error.localizedDescription)")
                    responseToSend = RPCResponseSchema(
                        error: errPayload, id: request.id, result: nil)
                }
                self.sendRpcResponse(responseToSend)
            }
            return

        case .restoreSystemAudio:
            logToStderr("[IOBridge] Handling restoreSystemAudio for ID: \(request.id)")

            let success = accessibilityService.restoreSystemAudio()
            if success {  // Play sound only if restore was successful
                audioService.playSound(named: "rec-stop")
            }
            let resultPayload = RestoreSystemAudioResultSchema(
                message: success ? "Restore command sent" : "Failed to send restore command",
                success: success)

            do {
                let resultData = try jsonEncoder.encode(resultPayload)
                let resultAsJsonAny = try jsonDecoder.decode(JSONAny.self, from: resultData)
                rpcResponse = RPCResponseSchema(error: nil, id: request.id, result: resultAsJsonAny)
            } catch {
                logToStderr(
                    "[IOBridge] Error encoding pauseSystemAudio result: \(error.localizedDescription) for ID: \(request.id)"
                )
                let errPayload = Error(
                    code: -32603, data: nil,
                    message: "Error encoding result: \(error.localizedDescription)")
                rpcResponse = RPCResponseSchema(error: nil, id: request.id, result: nil)
            }

        default:
            logToStderr("[IOBridge] Method not found: \(request.method) for ID: \(request.id)")
            let errPayload = Error(
                code: -32601, data: nil, message: "Method not found: \(request.method)")
            rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
        }
        sendRpcResponse(rpcResponse)
    }

    private func sendRpcResponse(_ response: RPCResponseSchema) {
        do {
            let responseData = try jsonEncoder.encode(response)
            if let responseString = String(data: responseData, encoding: .utf8) {
                logToStderr("[Swift Biz Logic] FINAL JSON RESPONSE to stdout: \(responseString)")
                print(responseString)
                fflush(stdout)
            }
        } catch {
            logToStderr("Error encoding RpcResponse: \(error.localizedDescription)")
        }
    }

    // Main loop for processing RPC requests from stdin
    func processRpcRequests() {
        logToStderr("IOBridge: Starting RPC request processing loop.")
        while let line = readLine(strippingNewline: true) {
            guard !line.isEmpty, let data = line.data(using: .utf8) else {
                logToStderr("Warning: Received empty or non-UTF8 line on stdin.")
                continue
            }

            do {
                let rpcRequest = try jsonDecoder.decode(RPCRequestSchema.self, from: data)
                logToStderr(
                    "IOBridge: Received RPC Request ID \(rpcRequest.id), Method: \(rpcRequest.method)"
                )
                handleRpcRequest(rpcRequest)
            } catch {
                logToStderr(
                    "Error decoding RpcRequest from stdin: \(error.localizedDescription). Line: \(line)"
                )
                // Consider sending a parse error if ID can be extracted
            }
        }
        logToStderr("IOBridge: RPC request processing loop finished (stdin closed).")
    }

    // MARK: - Async RPC Handlers

    private func handleAccessibilityTreeDetails(_ request: RPCRequestSchema) {
        var accessibilityParams: GetAccessibilityTreeDetailsParamsSchema? = nil
        logToStderr("[IOBridge] Handling getAccessibilityTreeDetails for ID: \(request.id)")

        if let paramsAnyCodable = request.params {
            do {
                let paramsData = try jsonEncoder.encode(paramsAnyCodable)
                accessibilityParams = try jsonDecoder.decode(
                    GetAccessibilityTreeDetailsParamsSchema.self, from: paramsData)
                logToStderr(
                    "[IOBridge] Decoded accessibilityParams.rootID: \(accessibilityParams?.rootID ?? "nil") for ID: \(request.id)"
                )
            } catch {
                logToStderr(
                    "[IOBridge] Error decoding getAccessibilityTreeDetails params: \(error.localizedDescription)"
                )
                let errPayload = Error(
                    code: -32602, data: request.params,
                    message: "Invalid params: \(error.localizedDescription)")
                let rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
                sendRpcResponse(rpcResponse)
                return
            }
        }

        // Fetch REAL accessibility tree data using the service
        let actualTreeData: AccessibilityElementNode? =
            accessibilityService.fetchFullAccessibilityTree(rootId: accessibilityParams?.rootID)

        logToStderr(
            "[IOBridge] Fetched actualTreeData from AccessibilityService. Is nil? \(actualTreeData == nil). For ID: \(request.id)"
        )

        var treeAsJsonAny: JSONAny? = nil
        if let dataToEncode = actualTreeData {
            do {
                let encodedData = try jsonEncoder.encode(dataToEncode)
                treeAsJsonAny = try jsonDecoder.decode(JSONAny.self, from: encodedData)
                if let treeDataForLog = try? jsonEncoder.encode(treeAsJsonAny),
                    let treeStringForLog = String(data: treeDataForLog, encoding: .utf8)
                {
                    logToStderr(
                        "[IOBridge] treeAsJsonAny (after encoding actualTreeData): \(treeStringForLog) for ID: \(request.id)"
                    )
                }
            } catch {
                logToStderr(
                    "[IOBridge] Error encoding actualTreeData to JSONAny: \(error.localizedDescription) for ID: \(request.id)"
                )
            }
        }

        let resultPayload = GetAccessibilityTreeDetailsResultSchema(tree: treeAsJsonAny)
        do {
            let resultPayloadForLogData = try jsonEncoder.encode(resultPayload)
            if let resultPayloadStringForLog = String(
                data: resultPayloadForLogData, encoding: .utf8)
            {
                logToStderr(
                    "[IOBridge] GetAccessibilityTreeDetailsResultSchema (resultPayload) before final encoding: \(resultPayloadStringForLog) for ID: \(request.id)"
                )
            }
        } catch {
            logToStderr(
                "[IOBridge] Error encoding resultPayload for logging: \(error.localizedDescription) for ID: \(request.id)"
            )
        }

        var resultAsJsonAny: JSONAny? = nil
        do {
            let resultPayloadData = try jsonEncoder.encode(resultPayload)
            resultAsJsonAny = try jsonDecoder.decode(JSONAny.self, from: resultPayloadData)
        } catch {
            logToStderr(
                "Error encoding GetAccessibilityTreeDetailsResultSchema to JSONAny: \(error.localizedDescription)"
            )
        }
        let rpcResponse = RPCResponseSchema(error: nil, id: request.id, result: resultAsJsonAny)
        sendRpcResponse(rpcResponse)
    }

    private func handleAccessibilityContext(_ request: RPCRequestSchema) {
        var contextParams: GetAccessibilityContextParamsSchema? = nil
        logToStderr("[IOBridge] Handling getAccessibilityContext for ID: \(request.id)")

        if let paramsAnyCodable = request.params {
            do {
                let paramsData = try jsonEncoder.encode(paramsAnyCodable)
                contextParams = try jsonDecoder.decode(
                    GetAccessibilityContextParamsSchema.self, from: paramsData)
                logToStderr(
                    "[IOBridge] Decoded contextParams.editableOnly: \(contextParams?.editableOnly ?? false) for ID: \(request.id)"
                )
            } catch {
                logToStderr(
                    "[IOBridge] Error decoding getAccessibilityContext params: \(error.localizedDescription)"
                )
                let errPayload = Error(
                    code: -32602, data: request.params,
                    message: "Invalid params: \(error.localizedDescription)")
                let rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
                sendRpcResponse(rpcResponse)
                return
            }
        }

        let editableOnly = contextParams?.editableOnly ?? false
        let context = AccessibilityContextService.getAccessibilityContext(
            editableOnly: editableOnly)
        logToStderr("[IOBridge] Retrieved context for ID: \(request.id)")

        let resultPayload = GetAccessibilityContextResultSchema(context: context)
        do {
            let resultData = try jsonEncoder.encode(resultPayload)
            let resultAsJsonAny = try jsonDecoder.decode(JSONAny.self, from: resultData)
            let rpcResponse = RPCResponseSchema(error: nil, id: request.id, result: resultAsJsonAny)
            sendRpcResponse(rpcResponse)
        } catch {
            logToStderr(
                "[IOBridge] Error encoding getAccessibilityContext result: \(error.localizedDescription) for ID: \(request.id)"
            )
            let errPayload = Error(
                code: -32603, data: nil,
                message: "Error encoding result: \(error.localizedDescription)")
            let rpcResponse = RPCResponseSchema(error: errPayload, id: request.id, result: nil)
            sendRpcResponse(rpcResponse)
        }
    }

}