use serde::Deserialize;
use std::process::Command;
use std::io::{BufRead, BufReader};

#[derive(Debug, Deserialize)]
pub struct AIVideoRequest {
    pub image_path: String,
    pub prompt: String,
    pub duration: String,
    pub model_type: String,
    pub output_path: Option<String>,
    pub timeout: Option<u32>,
}

#[derive(Debug, Deserialize)]
pub struct BatchAIVideoRequest {
    pub image_folder: String,
    pub prompts: Vec<String>,
    pub output_folder: String,
    pub duration: String,
    pub model_type: String,
    pub timeout: Option<u32>,
}

async fn execute_python_command(_app: tauri::AppHandle, args: &[String]) -> Result<String, String> {
    println!("Executing Python command with args: {:?}", args);
    
    // Get project root directory
    let current_dir = std::env::current_dir()
        .map_err(|e| format!("Failed to get current directory: {}", e))?;

    let project_root = if current_dir.ends_with("src-tauri") {
        current_dir.parent().unwrap_or(&current_dir).to_path_buf()
    } else {
        current_dir
    };

    println!("Working directory: {:?}", project_root);

    // Try multiple Python commands in order of preference

    let mut child = None;
    let mut last_error = String::new();

    let mut cmd = Command::new("python");
    cmd.current_dir(&project_root);
    cmd.args(args);
    cmd.stdout(std::process::Stdio::piped());
    cmd.stderr(std::process::Stdio::piped());

    match cmd.spawn() {
        Ok(process) => {
            println!("Successfully started Python process");
            child = Some(process);
        }
        Err(e) => {
            last_error = format!("Failed to process: {}", e);
            println!("{}", last_error);
        }
    }

    let mut child = child.ok_or_else(|| {
        format!("Failed to start Python process with any command. Last error: {}", last_error)
    })?;

    let stdout = child.stdout.take().unwrap();
    let stderr = child.stderr.take().unwrap();

    let stdout_reader = BufReader::new(stdout);
    let stderr_reader = BufReader::new(stderr);

    let mut progress_messages = Vec::new();
    let mut error_messages = Vec::new();
    let mut final_result: Option<String> = None;

    // Read stdout
    for line in stdout_reader.lines() {
        let line = line.map_err(|e| format!("Failed to read stdout: {}", e))?;
        println!("Python stdout: {}", line);

        // Parse JSON-RPC messages
        if line.starts_with("JSONRPC:") {
            let json_str = &line[8..]; // Remove "JSONRPC:" prefix
            if let Ok(json_value) = serde_json::from_str::<serde_json::Value>(json_str) {
                if let Some(method) = json_value.get("method") {
                    if method == "progress" {
                        progress_messages.push(json_str.to_string());
                        println!("Progress: {}", json_str);
                    }
                } else if json_value.get("result").is_some() || json_value.get("error").is_some() {
                    // This is a final result or error response - always update to get the latest
                    final_result = Some(json_str.to_string());
                    println!("JSON-RPC result found: {}", json_str);
                }
            }
        } else if line.trim().starts_with('{') && line.trim().ends_with('}') {
            // Fallback: try to parse as direct JSON result
            if let Ok(json_value) = serde_json::from_str::<serde_json::Value>(line.trim()) {
                // Check if this looks like a final result (has status field)
                if json_value.get("status").is_some() {
                    final_result = Some(line.trim().to_string());
                    println!("Direct JSON result: {}", line.trim());
                }
            }
        }
    }

    // Read stderr
    for line in stderr_reader.lines() {
        let line = line.map_err(|e| format!("Failed to read stderr: {}", e))?;
        println!("Python stderr: {}", line);
        error_messages.push(line);
    }

    // Wait for process to complete
    println!("Waiting for Python process to complete...");
    let exit_status = child.wait()
        .map_err(|e| format!("Failed to wait for Python process: {}", e))?;

    println!("Python process terminated with code: {:?}", exit_status.code());
    println!("Python script exit code: {:?}", exit_status.code());

    // Check if process was terminated externally
    if let Some(code) = exit_status.code() {
        if code != 0 {
            println!("Python process exited with non-zero code: {}", code);
            // Convert to unsigned for Windows exit codes
            let unsigned_code = code as u32;
            if unsigned_code == 3221225786 || code == -1073741510 {
                println!("Process was likely terminated by antivirus or system security");
            } else if code == 1 {
                println!("Process exited with error code 1 (general error)");
            }
        }
    } else {
        println!("Python process was terminated by signal (killed externally)");
    }

    // Return the final result if we found one
    if let Some(result) = final_result {
        println!("Extracted JSON-RPC result: {}", result);
        return Ok(result);
    }

    // If no JSON-RPC result found, provide detailed error information
    if exit_status.success() {
        // Process succeeded but no output - this is unusual
        let error_msg = if progress_messages.is_empty() {
            "Python script completed successfully but produced no output"
        } else {
            "Python script completed but did not return a valid JSON result"
        };
        Err(error_msg.to_string())
    } else {
        // Process failed - provide detailed error based on exit code
        let error_msg = if let Some(code) = exit_status.code() {
            let unsigned_code = code as u32;
            match code {
                1 => "Python script failed with general error. Check if all dependencies are installed.".to_string(),
                -1073741510 => "Python process was terminated by antivirus or system security. Please add the application to your antivirus whitelist.".to_string(),
                _ if unsigned_code == 3221225786 => "Python process was terminated by antivirus or system security. Please add the application to your antivirus whitelist.".to_string(),
                _ => format!("Python script failed with exit code: {}. This may indicate a system or environment issue.", code)
            }
        } else {
            "Python process was killed by external signal. This may be caused by antivirus software or system security policies.".to_string()
        };

        // Include any error output we captured
        let mut full_error = error_msg;

        if !progress_messages.is_empty() {
            full_error.push_str(&format!("\n\nLast stdout: {}", progress_messages.join("\n")));
        }

        if !error_messages.is_empty() {
            full_error.push_str(&format!("\n\nStderr: {}", error_messages.join("\n")));
        }

        Err(full_error)
    }
}

#[tauri::command]
pub async fn generate_ai_video(app: tauri::AppHandle, request: AIVideoRequest) -> Result<String, String> {
    let mut args = vec![
        "-m".to_string(),
        "python_core.ai_video.video_generator".to_string(),
        "--action".to_string(),
        "single".to_string(),
        "--image".to_string(),
        request.image_path,
        "--prompt".to_string(),
        request.prompt,
        "--duration".to_string(),
        request.duration,
        "--model".to_string(),
        request.model_type,
    ];

    if let Some(output_path) = request.output_path {
        args.push("--output".to_string());
        args.push(output_path);
    }

    if let Some(timeout) = request.timeout {
        args.push("--timeout".to_string());
        args.push(timeout.to_string());
    }

    execute_python_command(app, &args).await
}

#[tauri::command]
pub async fn batch_generate_ai_videos(app: tauri::AppHandle, request: BatchAIVideoRequest) -> Result<String, String> {
    let prompts_json = serde_json::to_string(&request.prompts)
        .map_err(|e| format!("Failed to serialize prompts: {}", e))?;

    let mut args = vec![
        "-m".to_string(),
        "python_core.ai_video.video_generator".to_string(),
        "--action".to_string(),
        "batch".to_string(),
        "--folder".to_string(),
        request.image_folder,
        "--prompts".to_string(),
        prompts_json,
        "--output".to_string(),
        request.output_folder,
        "--duration".to_string(),
        request.duration,
        "--model".to_string(),
        request.model_type,
    ];

    if let Some(timeout) = request.timeout {
        args.push("--timeout".to_string());
        args.push(timeout.to_string());
    }

    execute_python_command(app, &args).await
}

#[tauri::command]
pub async fn test_ai_video_environment(_app: tauri::AppHandle) -> Result<String, String> {
    println!("Testing AI video environment...");

    // Get project root directory
    let current_dir = std::env::current_dir()
        .map_err(|e| format!("Failed to get current directory: {}", e))?;

    let project_root = if current_dir.ends_with("src-tauri") {
        current_dir.parent().unwrap_or(&current_dir).to_path_buf()
    } else {
        current_dir
    };

    println!("Testing from project root: {:?}", project_root);

    // Try multiple Python commands in order of preference
    let python_commands = if cfg!(target_os = "windows") {
        vec!["python", "python3", "py"]
    } else {
        vec!["python3", "python"]
    };

    for python_cmd in python_commands {
        println!("Testing Python command: {}", python_cmd);
        let output = Command::new(python_cmd)
            .current_dir(&project_root)
            .args(&["-c", "import sys; print(f'Python {sys.version}'); import requests; print('requests OK'); import PIL; print('PIL OK')"])
            .output();

        match output {
            Ok(output) => {
                if output.status.success() {
                    let stdout = String::from_utf8_lossy(&output.stdout);
                    return Ok(format!("Environment test passed with {}:\n{}", python_cmd, stdout));
                } else {
                    let stderr = String::from_utf8_lossy(&output.stderr);
                    println!("Python {} test failed: {}", python_cmd, stderr);
                    continue;
                }
            }
            Err(e) => {
                println!("Failed to execute Python {}: {}", python_cmd, e);
                continue;
            }
        }
    }

    Err("Failed to find a working Python installation".to_string())
}