use axum::http::StatusCode;
use axum::response::{IntoResponse, Response};
use serde::Serialize;

#[derive(Debug, Serialize)]
struct ErrorResponse {
    error: String,
}

pub struct ApiError(pub pinakes_core::error::PinakesError);

impl IntoResponse for ApiError {
    fn into_response(self) -> Response {
        use pinakes_core::error::PinakesError;
        let (status, message) = match &self.0 {
            PinakesError::NotFound(msg) => (StatusCode::NOT_FOUND, msg.clone()),
            PinakesError::FileNotFound(path) => {
                // Only expose the file name, not the full path
                let name = path
                    .file_name()
                    .map(|n| n.to_string_lossy().to_string())
                    .unwrap_or_else(|| "unknown".to_string());
                tracing::debug!(path = %path.display(), "file not found");
                (StatusCode::NOT_FOUND, format!("file not found: {name}"))
            }
            PinakesError::TagNotFound(msg) => (StatusCode::NOT_FOUND, msg.clone()),
            PinakesError::CollectionNotFound(msg) => (StatusCode::NOT_FOUND, msg.clone()),
            PinakesError::DuplicateHash(msg) => (StatusCode::CONFLICT, msg.clone()),
            PinakesError::UnsupportedMediaType(path) => {
                let name = path
                    .file_name()
                    .map(|n| n.to_string_lossy().to_string())
                    .unwrap_or_else(|| "unknown".to_string());
                (
                    StatusCode::BAD_REQUEST,
                    format!("unsupported media type: {name}"),
                )
            }
            PinakesError::SearchParse(msg) => (StatusCode::BAD_REQUEST, msg.clone()),
            PinakesError::InvalidOperation(msg) => (StatusCode::BAD_REQUEST, msg.clone()),
            PinakesError::Authentication(msg) => (StatusCode::UNAUTHORIZED, msg.clone()),
            PinakesError::Authorization(msg) => (StatusCode::FORBIDDEN, msg.clone()),
            PinakesError::Config(_) => {
                tracing::error!(error = %self.0, "configuration error");
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "internal configuration error".to_string(),
                )
            }
            _ => {
                tracing::error!(error = %self.0, "internal server error");
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    "internal server error".to_string(),
                )
            }
        };

        let body = serde_json::to_string(&ErrorResponse {
            error: message.clone(),
        })
        .unwrap_or_else(|_| format!(r#"{{"error":"{}"}}"#, message));
        (status, [("content-type", "application/json")], body).into_response()
    }
}

impl From<pinakes_core::error::PinakesError> for ApiError {
    fn from(e: pinakes_core::error::PinakesError) -> Self {
        Self(e)
    }
}

impl ApiError {
    pub fn bad_request(msg: impl Into<String>) -> Self {
        Self(pinakes_core::error::PinakesError::InvalidOperation(
            msg.into(),
        ))
    }

    pub fn not_found(msg: impl Into<String>) -> Self {
        Self(pinakes_core::error::PinakesError::NotFound(msg.into()))
    }

    pub fn internal(msg: impl Into<String>) -> Self {
        Self(pinakes_core::error::PinakesError::Database(msg.into()))
    }

    pub fn forbidden(msg: impl Into<String>) -> Self {
        Self(pinakes_core::error::PinakesError::Authorization(msg.into()))
    }

    pub fn unauthorized(msg: impl Into<String>) -> Self {
        Self(pinakes_core::error::PinakesError::Authentication(
            msg.into(),
        ))
    }
}

pub type ApiResult<T> = Result<T, ApiError>;