import AppKit
import AXExtension
import AXHelper
import ConversationServiceProvider
import Foundation
import JSONRPC
import Logger
import XcodeInspector

public class InsertEditIntoFileTool: ICopilotTool {
    public static let name = ToolName.insertEditIntoFile
    
    public func invokeTool(
        _ request: InvokeClientToolRequest,
        completion: @escaping (AnyJSONRPCResponse) -> Void,
        chatHistoryUpdater: ChatHistoryUpdater?,
        contextProvider: (any ToolContextProvider)?
    ) -> Bool {
        guard let params = request.params,
              let input = request.params?.input,
              let code = input["code"]?.value as? String,
              let filePath = input["filePath"]?.value as? String,
              let contextProvider
        else {
            completeResponse(request, status: .error, response: "Invalid parameters", completion: completion)
            return true
        }
        
        do {
            let fileURL = URL(fileURLWithPath: filePath)
            let originalContent = try String(contentsOf: fileURL, encoding: .utf8)
            
            InsertEditIntoFileTool.applyEdit(for: fileURL, content: code, contextProvider: contextProvider) { newContent, error in
                if let error = error {
                    self.completeResponse(
                        request,
                        status: .error,
                        response: error.localizedDescription,
                        completion: completion
                    )
                    return
                }
                
                guard let newContent = newContent
                else {
                    self.completeResponse(request, status: .error, response: "Failed to apply edit", completion: completion)
                    return
                }
                
                contextProvider.updateFileEdits(
                    by: .init(fileURL: fileURL, originalContent: originalContent, modifiedContent: code, toolName: InsertEditIntoFileTool.name)
                )
                
                let editAgentRounds: [AgentRound] = [
                    .init(
                        roundId: params.roundId,
                        reply: "",
                        toolCalls: [
                            .init(
                                id: params.toolCallId,
                                name: params.name,
                                status: .completed,
                                invokeParams: params
                            )
                        ]
                    )
                ]
                
                if let chatHistoryUpdater {
                    chatHistoryUpdater(params.turnId, editAgentRounds)
                }
                
                self.completeResponse(request, response: newContent, completion: completion)
            }
            
        } catch {
            completeResponse(
                request,
                status: .error,
                response: error.localizedDescription,
                completion: completion
            )
        }
        
        return true
    }
    
    public static func applyEdit(
        for fileURL: URL, 
        content: String, 
        contextProvider: any ToolContextProvider, 
        xcodeInstance: AppInstanceInspector
    ) throws -> String {
        // Get the focused element directly from the app (like XcodeInspector does)
        guard let focusedElement: AXUIElement = try? xcodeInstance.appElement.copyValue(key: kAXFocusedUIElementAttribute)
        else {
            throw NSError(domain: "Failed to access xcode element", code: 0)
        }
        
        // Find the source editor element using XcodeInspector's logic
        let editorElement = try findSourceEditorElement(from: focusedElement, xcodeInstance: xcodeInstance)
        
        // Check if element supports kAXValueAttribute before reading
        var value: String = ""
        do {
            value = try editorElement.copyValue(key: kAXValueAttribute)
        } catch {
            if let axError = error as? AXError {
                Logger.client.error("AX Error code: \(axError.rawValue)")
            }
            throw error
        }
        
        let lines = value.components(separatedBy: .newlines)
        
        var isInjectedSuccess = false
        var injectionError: Error?
        
        do {
            try AXHelper().injectUpdatedCodeWithAccessibilityAPI(
                .init(
                    content: content,
                    newSelection: nil,
                    modifications: [
                        .deletedSelection(
                            .init(start: .init(line: 0, character: 0), end: .init(line: lines.count - 1, character: (lines.last?.count ?? 100) - 1))
                        ),
                        .inserted(0, [content])
                    ]
                ),
                focusElement: editorElement,
                onSuccess: {
                    Logger.client.info("Content injection succeeded")
                    isInjectedSuccess = true
                },
                onError: {
                    Logger.client.error("Content injection failed in onError callback")
                }
            )
        } catch {
            Logger.client.error("Content injection threw error: \(error)")
            if let axError = error as? AXError {
                Logger.client.error("AX Error code during injection: \(axError.rawValue)")
            }
            injectionError = error
        }
        
        if !isInjectedSuccess {
            let errorMessage = injectionError?.localizedDescription ?? "Failed to apply edit"
            Logger.client.error("Edit application failed: \(errorMessage)")
            throw NSError(domain: "Failed to apply edit: \(errorMessage)", code: 0)
        }
        
        // Verify the content was applied by reading it back
        do {
            let newContent: String = try editorElement.copyValue(key: kAXValueAttribute)
            Logger.client.info("Successfully read back new content, length: \(newContent.count)")
            return newContent
        } catch {
            Logger.client.error("Failed to read back new content: \(error)")
            if let axError = error as? AXError {
                Logger.client.error("AX Error code when reading back: \(axError.rawValue)")
            }
            throw error
        }
    }
    
    private static func findSourceEditorElement(
        from element: AXUIElement, 
        xcodeInstance: AppInstanceInspector,
        shouldRetry: Bool = true
    ) throws -> AXUIElement {
        // 1. Check if the current element is a source editor
        if element.isSourceEditor {
            return element
        }
        
        // 2. Search for child that is a source editor
        if let sourceEditorChild = element.firstChild(where: \.isSourceEditor) {
            return sourceEditorChild
        }
        
        // 3. Search for parent that is a source editor (XcodeInspector's approach)
        if let sourceEditorParent = element.firstParent(where: \.isSourceEditor) {
            return sourceEditorParent
        }
        
        // 4. Search for parent that is an editor area
        if let editorAreaParent = element.firstParent(where: \.isEditorArea) {
            // 3.1 Search for child that is a source editor
            if let sourceEditorChild = editorAreaParent.firstChild(where: \.isSourceEditor) {
                return sourceEditorChild
            }
        }
        
        // 5. Search for the workspace window
        if let xcodeWorkspaceWindowParent = element.firstParent(where: \.isXcodeWorkspaceWindow) {
            // 4.1 Search for child that is an editor area
            if let editorAreaChild = xcodeWorkspaceWindowParent.firstChild(where: \.isEditorArea) {
                // 4.2 Search for child that is a source editor
                if let sourceEditorChild = editorAreaChild.firstChild(where: \.isSourceEditor) {
                    return sourceEditorChild
                }
            }
        }
        
        // 6. retry
        if shouldRetry {
            Thread.sleep(forTimeInterval: 1)
            return try findSourceEditorElement(from: element, xcodeInstance: xcodeInstance, shouldRetry: false)
        }
        
        
        throw NSError(domain: "Could not find source editor element", code: 0)
    }
    
    public static func applyEdit(
        for fileURL: URL, 
        content: String, 
        contextProvider: any ToolContextProvider,
        completion: ((String?, Error?) -> Void)? = nil
    ) {
        Utils.openFileInXcode(fileURL: fileURL) { app, error in
            do {
                if let error = error { throw error }
                
                guard let app = app
                else {
                    throw NSError(domain: "Failed to get the app that opens file.", code: 0)
                }
                
                let appInstanceInspector = AppInstanceInspector(runningApplication: app)
                guard appInstanceInspector.isXcode
                else {
                    throw NSError(domain: "The file is not opened in Xcode.", code: 0)
                }
                
                let newContent = try applyEdit(
                    for: fileURL,
                    content: content,
                    contextProvider: contextProvider,
                    xcodeInstance: appInstanceInspector
                )
                
                if let completion = completion { completion(newContent, nil) }
            } catch {
                if let completion = completion { completion(nil, error) }
                Logger.client.info("Failed to apply edit for file at \(fileURL), \(error)")
            }
        }
    }
}