quoter/src/handlers/proxy.rs

use actix_web::error::ErrorNotFound;
use actix_web::{error::ErrorInternalServerError, web, HttpRequest, HttpResponse, Result};
use log::{error, warn};

use crate::app_state::AppState;
use crate::handlers::serve_file::serve_file;
use crate::s3_utils::{check_file_exists, load_file_from_s3, upload_to_s3};
use crate::thumbnail::{find_closest_width, parse_file_path, thumbdata_save};
use crate::lookup::{find_file_by_pattern, get_mime_type};

/// Обработчик для скачивания файла и генерации миниатюры, если она недоступна.
pub async fn proxy_handler(
    req: HttpRequest,
    requested_res: web::Path<String>,
    state: web::Data<AppState>,
) -> Result<HttpResponse, actix_web::Error> {
    warn!("\t>>>\tGET {} [START]", requested_res);
    let normalized_path = if requested_res.ends_with("/webp") {
        warn!("Removing /webp suffix from path");
        requested_res.replace("/webp", "")
    } else {
        requested_res.to_string()
    };

    // парсим GET запрос
    let (base_filename, requested_width, extension) = parse_file_path(&normalized_path);
    warn!("detected file extension: {}", extension);
    warn!("base_filename: {}", base_filename);
    warn!("requested width: {}", requested_width);
    let ext = extension.as_str().to_lowercase();
    warn!("normalized to lowercase: {}", ext);
    let filekey = format!("{}.{}", base_filename, &ext);
    warn!("filekey: {}", filekey);
    let content_type = match get_mime_type(&ext) {
        Some(mime) => mime.to_string(),
        None => {
            let mut redis = state.redis.clone();
            match find_file_by_pattern(&mut redis, &base_filename).await {
                Ok(Some(found_file)) => {
                    if let Some(found_ext) = found_file.split('.').last() {
                        get_mime_type(found_ext)
                            .unwrap_or("application/octet-stream")
                            .to_string()
                    } else {
                        "application/octet-stream".to_string()
                    }
                }
                _ => {
                    error!("unsupported file format");
                    return Err(ErrorInternalServerError("unsupported file format"));
                }
            }
        }
    };

    warn!("content_type: {}", content_type);

    let shout_id = match req.query_string().contains("s=") {
        true => req.query_string().split("s=").collect::<Vec<&str>>().pop().unwrap_or(""),
        false => ""
    };

    return match state.get_path(&filekey).await {
        Ok(Some(stored_path)) => {
            warn!("Found stored path in DB: {}", stored_path);
            warn!("Checking Storj path - bucket: {}, path: {}", state.bucket, stored_path);
            if check_file_exists(&state.storj_client, &state.bucket, &stored_path).await? {
                warn!("File exists in Storj: {}", stored_path);
                if content_type.starts_with("image") {
                    warn!("Processing image file with width: {}", requested_width);
                    if requested_width == 0 {
                        warn!("Serving original file without resizing");
                        serve_file(&stored_path, &state, shout_id).await
                    } else {
                        let closest: u32 = find_closest_width(requested_width as u32);
                        warn!("Calculated closest width: {} for requested: {}", closest, requested_width);
                        let thumb_filename = &format!("{}_{}.{}", base_filename, closest, ext);
                        warn!("Generated thumbnail filename: {}", thumb_filename);

                        // Проверяем, существует ли уже миниатюра в Storj
                        match check_file_exists(&state.storj_client, &state.bucket, thumb_filename).await {
                            Ok(true) => {
                                warn!("serve existed thumb file: {}", thumb_filename);
                                serve_file(thumb_filename, &state, shout_id).await
                            },
                            Ok(false) => {
                                // Миниатюра не существует, возвращаем оригинал и запускаем генерацию миниатюры
                                let original_file = serve_file(&stored_path, &state, shout_id).await?;
                                
                                // Запускаем асинхронную задачу для генерации миниатюры
                                let state_clone = state.clone();
                                let stored_path_clone = stored_path.clone();
                                let filekey_clone = filekey.clone();
                                let content_type_clone = content_type.to_string();

                                actix_web::rt::spawn(async move {
                                    if let Ok(filedata) = load_file_from_s3(&state_clone.storj_client, &state_clone.bucket, &stored_path_clone).await {
                                        warn!("generate new thumb files: {}", stored_path_clone);
                                        if let Err(e) = thumbdata_save(filedata, &state_clone, &filekey_clone, content_type_clone).await {
                                            error!("Failed to generate thumbnail: {}", e);
                                        }
                                    }
                                });

                                Ok(original_file)
                            }
                            Err(e) => {
                                error!("ошибка при проверке существования миниатюры: {}", e);
                                Err(ErrorInternalServerError("failed to load thumbnail"))
                            }
                        }
                    }
                } else {
                    warn!("File is not an image, proceeding with normal serving");
                    serve_file(&stored_path, &state, shout_id).await
                }
            } else {
                warn!("Attempting to load from AWS - bucket: {}, path: {}", state.bucket, stored_path);

                // Определяем тип медиа из content_type
                let media_type = content_type.split("/").next().unwrap_or("image");

                // Создаем варианты путей с обоими регистрами расширения
                let paths_lower = vec![
                    stored_path.clone(),
                    // format!("production/{}", stored_path),
                    format!("production/{}/{}", media_type, stored_path)
                ];

                // Создаем те же пути, но с оригинальным регистром расширения
                let orig_ext = extension.as_str(); // оригинальное расширение
                let orig_stored_path = format!("{}.{}", base_filename, orig_ext);
                let paths_orig = vec![
                    orig_stored_path.clone(),
                    // format!("production/{}", orig_stored_path),
                    format!("production/{}/{}", media_type, orig_stored_path)
                ];

                // Объединяем все пути для проверки
                let all_paths = paths_lower.into_iter().chain(paths_orig.into_iter());

                for path in all_paths {
                    warn!("Trying AWS path: {}", path);
                    match load_file_from_s3(&state.aws_client, &state.bucket, &path).await {
                        Ok(filedata) => {
                            warn!("Successfully loaded file from AWS, size: {} bytes", filedata.len());
                            warn!("Attempting to upload to Storj with key: {}", filekey);
                            
                            if let Err(e) = upload_to_s3(
                                &state.storj_client,
                                &state.bucket,
                                &filekey,
                                filedata.clone(),
                                &content_type,
                            ).await {
                                error!("Failed to upload to Storj: {} - Error: {}", filekey, e);
                            } else {
                                warn!("Successfully uploaded to Storj: {}", filekey);
                            }
                            
                            return Ok(HttpResponse::Ok().content_type(content_type).body(filedata));
                        }
                        Err(err) => {
                            warn!("Failed to load from AWS path {}: {:?}", path, err);
                            continue;
                        }
                    }
                }

                error!("Failed to load from any AWS path for: {}", stored_path);
                Err(ErrorInternalServerError("Failed to load file from AWS"))
            }
        }
        Ok(None) => {
            warn!("No stored path found in DB for: {}", filekey);
            let ct_parts = content_type.split("/").collect::<Vec<&str>>();
            
            // Создаем два варианта пути - с оригинальным расширением и с нижним регистром
            let filepath_lower = format!("production/{}/{}.{}", ct_parts[0], base_filename, ext);
            let filepath_orig = format!("production/{}/{}.{}", ct_parts[0], base_filename, extension);
            
            warn!("Looking up files with paths: {} or {} in bucket: {}", 
                filepath_lower, filepath_orig, state.bucket);

            // Проверяем существование файла с обоими вариантами расширения
            let exists_in_aws_lower = check_file_exists(&state.aws_client, &state.bucket, &filepath_lower).await?;
            let exists_in_aws_orig = check_file_exists(&state.aws_client, &state.bucket, &filepath_orig).await?;
            
            let filepath = if exists_in_aws_orig {
                filepath_orig
            } else if exists_in_aws_lower {
                filepath_lower
            } else {
                // Если файл не найден ни с одним из расширений, используем нижний регистр по умолчанию
                filepath_lower
            };

            let exists_in_storj = check_file_exists(&state.storj_client, &state.bucket, &filepath).await?;
            warn!("Checking existence in Storj: {}", exists_in_storj);

            if exists_in_storj {
                warn!("file {} exists in storj, try to generate thumbnails", filepath);

                match load_file_from_s3(&state.aws_client, &state.bucket, &filepath).await {
                    Ok(filedata) => {
                        let _ = thumbdata_save(filedata.clone(), &state, &filekey, content_type.to_string()).await;
                    }
                    Err(e) => {
                        error!("cannot download {} from storj: {}", filekey, e);
                        return Err(ErrorInternalServerError(e));
                    }
                }
            } else {
                warn!("file {} does not exist in storj", filepath);
            }

            let exists_in_aws = check_file_exists(&state.aws_client, &state.bucket, &filepath).await?;
            warn!("Checking existence in AWS: {}", exists_in_aws);

            if exists_in_aws {
                warn!("File found in AWS, attempting to download: {}", filepath);
                match load_file_from_s3(&state.aws_client, &state.bucket, &filepath).await {
                    Ok(filedata) => {
                        warn!("Successfully downloaded file from AWS, size: {} bytes", filedata.len());
                        let _ = thumbdata_save(filedata.clone(), &state, &filekey, content_type.to_string())
                            .await;
                        if let Err(e) = upload_to_s3(
                            &state.storj_client,
                            &state.bucket,
                            &filekey,
                            filedata.clone(),
                            &content_type,
                        )
                        .await {
                            warn!("cannot upload to storj: {}", e);
                        } else {
                            warn!("file {} uploaded to storj", filekey);
                            state.set_path(&filekey, &filepath).await;
                        }
                        Ok(HttpResponse::Ok().content_type(content_type).body(filedata))
                    },
                    Err(e) => {
                        error!("Failed to download from AWS: {} - Error: {}", filepath, e);
                        Err(ErrorInternalServerError(e))
                    },
                }
            } else {
                error!("File not found in either Storj or AWS: {}", filepath);
                Err(ErrorNotFound("file does not exist"))
            }
        },
        Err(e) => {
            error!("Database error while getting path: {} - Full error: {:?}", filekey, e);
            Err(ErrorInternalServerError(e))
        }
    }
}