From 5f2466e463edcf6d161f9ba6371eaf7afc3549e3 Mon Sep 17 00:00:00 2001
From: Gus Power <gus@infinitesidequests.com>
Date: Thu, 15 May 2025 15:18:39 +0100
Subject: construct full config, use Args to load it

---
 src/error.rs | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 96 insertions(+)
 create mode 100644 src/error.rs

(limited to 'src/error.rs')

diff --git a/src/error.rs b/src/error.rs
new file mode 100644
index 0000000..d7bbfaf
--- /dev/null
+++ b/src/error.rs
@@ -0,0 +1,96 @@
+use std::fmt;
+use std::io;
+use std::path::PathBuf;
+use reqwest::Error as ReqwestError;
+use serde_json::Error as JsonError;
+
+pub type AppResult<T> = Result<T, AppError>;
+#[derive(Debug)]
+pub enum AppError {
+    FileNotFound(PathBuf),
+    IoError(io::Error),
+    ConfigParseError { source: JsonError, path: PathBuf },
+    RequestFailed { url: String, source: ReqwestError },
+    InvalidResponse { url: String, reason: String },
+    Timeout { url: String },
+}
+
+impl AppError {
+    pub fn with_path(self, path: impl Into<PathBuf>) -> Self {
+        match self {
+            Self::ConfigParseError { source, .. } => Self::ConfigParseError {
+                source,
+                path: path.into(),
+            },
+            err => err,
+        }
+    }
+
+    pub fn with_url(self, url: impl Into<String>) -> Self {
+        match self {
+            Self::RequestFailed { source, .. } => Self::RequestFailed {
+                source,
+                url: url.into(),
+            },
+            Self::InvalidResponse { reason, .. } => Self::InvalidResponse {
+                reason,
+                url: url.into(),
+            },
+            Self::Timeout { .. } => Self::Timeout {
+                url: url.into(),
+            },
+            err => err,
+        }
+    }
+}
+
+impl fmt::Display for AppError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            Self::FileNotFound(path) => write!(f, "File not found: {}", path.display()),
+            Self::IoError(err) => write!(f, "I/O error: {}", err),
+            Self::ConfigParseError { path, .. } => write!(f, "Failed to parse config at {}", path.display()),
+            Self::RequestFailed { url, .. } => write!(f, "Request to {} failed", url),
+            Self::InvalidResponse { url, reason } => {
+                write!(f, "Invalid response from {}: {}", url, reason)
+            }
+            Self::Timeout { url } => write!(f, "Request to {} timed out", url),
+        }
+    }
+}
+
+impl std::error::Error for AppError {
+    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+        match self {
+            Self::IoError(err) => Some(err),
+            Self::ConfigParseError { source, .. } => Some(source),
+            Self::RequestFailed { source, .. } => Some(source),
+            _ => None,
+        }
+    }
+}
+
+// Convenient conversions from library errors
+impl From<io::Error> for AppError {
+    fn from(err: io::Error) -> Self {
+        Self::IoError(err)
+    }
+}
+
+impl From<ReqwestError> for AppError {
+    fn from(err: ReqwestError) -> Self {
+        Self::RequestFailed {
+            url: err.url().map_or_else(|| "unknown".to_string(), |u| u.to_string()),
+            source: err,
+        }
+    }
+}
+
+impl From<JsonError> for AppError {
+    fn from(err: JsonError) -> Self {
+        Self::ConfigParseError {
+            source: err,
+            path: PathBuf::from("unknown"),  // Default path
+        }
+    }
+}
-- 
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