use crate::ContextWindow;

/// Result of a task execution containing both the response and the context window
#[derive(Debug, Clone)]
pub struct TaskResult {
    /// The actual response content from the task execution
    pub response: String,
    /// The complete context window at the time of completion
    pub context_window: ContextWindow,
}

impl TaskResult {
    pub fn new(response: String, context_window: ContextWindow) -> Self {
        Self {
            response,
            context_window,
        }
    }

    /// Extract the last block from the response (for coach feedback in autonomous mode)
    /// This looks for the final_output content which is the last substantial block
    pub fn extract_last_block(&self) -> String {
        // Remove any timing information at the end
        let content_without_timing = if let Some(timing_pos) = self.response.rfind("\n⏱️") {
            &self.response[..timing_pos]
        } else {
            &self.response
        };
        
        // Split by double newlines to find the last substantial block
        let blocks: Vec<&str> = content_without_timing.split("\n\n").collect();
        
        // Find the last non-empty block that isn't just whitespace
        blocks.iter()
            .rev()
            .find(|block| !block.trim().is_empty())
            .map(|block| block.trim().to_string())
            .unwrap_or_else(|| {
                // Fallback: if we can't find a clear block, take the whole thing
                content_without_timing.trim().to_string()
            })
    }

    /// Check if the response contains an approval (for autonomous mode)
    pub fn is_approved(&self) -> bool {
        self.extract_last_block().contains("IMPLEMENTATION_APPROVED")
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_extract_last_block() {
        // Test case 1: Response with timing info
        let context_window = ContextWindow::new(1000);
        let response_with_timing = "Some initial content\n\nFinal block content\n\n⏱️ 2.3s | 💭 1.2s".to_string();
        let result = TaskResult::new(response_with_timing, context_window.clone());
        assert_eq!(result.extract_last_block(), "Final block content");
        
        // Test case 2: Response without timing
        let response_no_timing = "Some initial content\n\nFinal block content".to_string();
        let result = TaskResult::new(response_no_timing, context_window.clone());
        assert_eq!(result.extract_last_block(), "Final block content");
        
        // Test case 3: Response with IMPLEMENTATION_APPROVED
        let response_approved = "Some content\n\nIMPLEMENTATION_APPROVED".to_string();
        let result = TaskResult::new(response_approved, context_window.clone());
        assert!(result.is_approved());
        
        // Test case 4: Response without approval
        let response_not_approved = "Some content\n\nNeeds more work".to_string();
        let result = TaskResult::new(response_not_approved, context_window);
        assert!(!result.is_approved());
    }

    #[test]
    fn test_extract_last_block_edge_cases() {
        let context_window = ContextWindow::new(1000);
        
        // Test empty response
        let empty_response = "".to_string();
        let result = TaskResult::new(empty_response, context_window.clone());
        assert_eq!(result.extract_last_block(), "");
        
        // Test single block
        let single_block = "Just one block".to_string();
        let result = TaskResult::new(single_block, context_window.clone());
        assert_eq!(result.extract_last_block(), "Just one block");
        
        // Test multiple empty blocks
        let multiple_empty = "\n\n\n\nSome content\n\n\n\n".to_string();
        let result = TaskResult::new(multiple_empty, context_window);
        assert_eq!(result.extract_last_block(), "Some content");
    }
}