use axum::{
    Router,
    extract::{DefaultBodyLimit, Multipart, Path, Request, State},
    http::StatusCode,
    response::{IntoResponse, Json},
    routing::{get, post},
};
use futures::TryStreamExt;
use libertas_core::{error::CoreError, models::Media, schema::UploadMediaData};
use std::{io, path::PathBuf};

use tower::ServiceExt;
use tower_http::services::ServeFile;
use uuid::Uuid;

use crate::{error::ApiError, extractors::query_options::ApiListMediaOptions, middleware::auth::UserId, schema::{MediaDetailsResponse, MediaMetadataResponse, MediaResponse}, state::AppState};


impl From<Media> for MediaResponse {
    fn from(media: Media) -> Self {
        Self {
            id: media.id,
            storage_path: media.storage_path,
            original_filename: media.original_filename,
            mime_type: media.mime_type,
            hash: media.hash,
        }
    }
}

pub fn media_routes(max_upload_size: usize) -> Router<AppState> {
    Router::new()
        .route("/", post(upload_media).get(list_user_media))
        .route("/{id}", get(get_media_details).delete(delete_media))
        .route("/{id}/file", get(get_media_file))
        .layer(DefaultBodyLimit::max(max_upload_size))
}

async fn upload_media(
    State(state): State<AppState>,
    UserId(user_id): UserId,
    mut multipart: Multipart,
) -> Result<(StatusCode, Json<MediaResponse>), ApiError> {
    let field = multipart
        .next_field()
        .await
        .map_err(|e| CoreError::Validation(format!("Multipart error: {}", e)))?
        .ok_or(ApiError::from(CoreError::Validation(
            "No file provided in 'file' field".to_string(),
        )))?;

    let filename = field.file_name().unwrap_or("unknown_file").to_string();
    let mime_type = field
        .content_type()
        .unwrap_or("application/octet-stream")
        .to_string();

    let stream = field.map_err(|e| io::Error::new(io::ErrorKind::Other, e));

    let boxed_stream: Box<
        dyn futures::Stream<Item = Result<bytes::Bytes, std::io::Error>> + Send + Unpin,
    > = Box::new(stream);

    let upload_data = UploadMediaData {
        owner_id: user_id,
        filename,
        mime_type,
        stream: boxed_stream,
    };

    let media = state.media_service.upload_media(upload_data).await?;

    Ok((StatusCode::CREATED, Json(media.into())))
}

async fn get_media_file(
    State(state): State<AppState>,
    UserId(user_id): UserId,
    Path(media_id): Path<Uuid>,
    request: Request,
) -> Result<impl IntoResponse, ApiError> {
    let storage_path = state
        .media_service
        .get_media_filepath(media_id, user_id)
        .await?;

    let full_path = PathBuf::from(&state.config.media_library_path).join(&storage_path);

    ServeFile::new(full_path)
        .oneshot(request)
        .await
        .map_err(|e| {
            ApiError::from(CoreError::Io(io::Error::new(
                io::ErrorKind::NotFound,
                format!("File not found: {}", e),
            )))
        })
}

async fn get_media_details(
    State(state): State<AppState>,
    UserId(user_id): UserId,
    Path(id): Path<Uuid>,
) -> Result<Json<MediaDetailsResponse>, ApiError> {
    let bundle = state.media_service.get_media_details(id, user_id).await?;
    let response = MediaDetailsResponse {
        id: bundle.media.id,
        storage_path: bundle.media.storage_path,
        original_filename: bundle.media.original_filename,
        mime_type: bundle.media.mime_type,
        hash: bundle.media.hash,
        metadata: bundle.metadata
            .into_iter()
            .map(MediaMetadataResponse::from)
            .collect(),
    };


    Ok(Json(response))
}

async fn delete_media(
    State(state): State<AppState>,
    UserId(user_id): UserId,
    Path(id): Path<Uuid>,
) -> Result<StatusCode, ApiError> {
    state.media_service.delete_media(id, user_id).await?;
    Ok(StatusCode::NO_CONTENT)
}

async fn list_user_media(
    State(state): State<AppState>,
    UserId(user_id): UserId,
    ApiListMediaOptions(options): ApiListMediaOptions,
) -> Result<Json<Vec<MediaResponse>>, ApiError> {    
    let media_list = state
        .media_service
        .list_user_media(user_id, options)
        .await?;

    let response = media_list.into_iter().map(MediaResponse::from).collect();
    Ok(Json(response))
}