pub mod planner;
pub mod runtime;
pub mod task_runner;

use std::sync::Arc;

use crate::browser::ws_backend::WsBrowserBackend;
use crate::browser::{BrowserBackend, PipeBrowserBackend};
use crate::pipe::{AgentMessage, BrowserMessage, BrowserPipeTool, PipeError, Transport};

pub use task_runner::{
    run_submit_task, run_submit_task_with_browser_backend, AgentEventSink, AgentRuntimeContext,
    SubmitTaskRequest,
};

fn execute_plan<T: Transport>(
    transport: &T,
    browser_tool: &BrowserPipeTool<T>,
    plan: &planner::TaskPlan,
) -> Result<String, PipeError> {
    for step in &plan.steps {
        transport.send(&AgentMessage::LogEntry {
            level: "info".to_string(),
            message: step.log_message.clone(),
        })?;

        let result = browser_tool.invoke(
            step.action.clone(),
            step.params.clone(),
            &step.expected_domain,
        )?;
        if !result.success {
            return Err(PipeError::Protocol(format!(
                "browser action failed: {}",
                result.data
            )));
        }
    }

    Ok(plan.summary.clone())
}

fn normalize_optional_submit_field(value: String) -> Option<String> {
    let trimmed = value.trim();
    (!trimmed.is_empty()).then(|| trimmed.to_string())
}

fn browser_backend_for_submit<T: Transport + 'static>(
    browser_tool: &BrowserPipeTool<T>,
    context: &AgentRuntimeContext,
    request: &SubmitTaskRequest,
) -> Result<Arc<dyn BrowserBackend>, PipeError> {
    if let Some(browser_ws_url) = configured_browser_ws_url(context) {
        return Ok(Arc::new(
            WsBrowserBackend::new(
                Arc::new(crate::service::browser_ws_client::ServiceWsClient::connect(
                    &browser_ws_url,
                )?),
                browser_tool.mac_policy().clone(),
                crate::service::browser_ws_client::initial_request_url_for_submit_task(request),
            )
            .with_response_timeout(browser_tool.response_timeout()),
        ));
    }

    Ok(Arc::new(PipeBrowserBackend::from_inner(browser_tool.clone())))
}

fn configured_browser_ws_url(context: &AgentRuntimeContext) -> Option<String> {
    std::env::var("SGCLAW_BROWSER_WS_URL")
        .ok()
        .filter(|value| !value.trim().is_empty())
        .or_else(|| {
            context
                .load_sgclaw_settings()
                .ok()
                .flatten()
                .and_then(|settings| settings.browser_ws_url)
                .map(|value| value.trim().to_string())
                .filter(|value| !value.is_empty())
        })
}

fn send_status_changed<T: Transport>(transport: &T, state: &str) -> Result<(), PipeError> {
    transport.send(&AgentMessage::StatusChanged {
        state: state.to_string(),
    })
}

pub fn execute_task<T: Transport>(
    transport: &T,
    browser_tool: &BrowserPipeTool<T>,
    instruction: &str,
) -> Result<String, PipeError> {
    let plan = planner::plan_instruction(instruction)
        .map_err(|err| PipeError::Protocol(err.to_string()))?;
    execute_plan(transport, browser_tool, &plan)
}

pub fn handle_browser_message<T: Transport + 'static>(
    transport: &T,
    browser_tool: &BrowserPipeTool<T>,
    message: BrowserMessage,
) -> Result<(), PipeError> {
    handle_browser_message_with_context(
        transport,
        browser_tool,
        &AgentRuntimeContext::default(),
        message,
    )
}

pub fn handle_browser_message_with_context<T: Transport + 'static>(
    transport: &T,
    browser_tool: &BrowserPipeTool<T>,
    context: &AgentRuntimeContext,
    message: BrowserMessage,
) -> Result<(), PipeError> {
    match message {
        BrowserMessage::Connect => send_status_changed(transport, "connected"),
        BrowserMessage::Start => send_status_changed(transport, "started"),
        BrowserMessage::Stop => send_status_changed(transport, "stopped"),
        BrowserMessage::SubmitTask {
            instruction,
            conversation_id,
            messages,
            page_url,
            page_title,
        } => {
            let request = SubmitTaskRequest {
                instruction,
                conversation_id: normalize_optional_submit_field(conversation_id),
                messages,
                page_url: normalize_optional_submit_field(page_url),
                page_title: normalize_optional_submit_field(page_title),
            };
            let browser_backend = browser_backend_for_submit(browser_tool, context, &request)?;
            run_submit_task_with_browser_backend(transport, transport, browser_backend, context, request)
        }
        BrowserMessage::Init { .. } => {
            eprintln!("ignoring duplicate init after handshake");
            Ok(())
        }
        BrowserMessage::Response { seq, .. } => {
            eprintln!("ignoring unsolicited response: seq={seq}");
            Ok(())
        }
    }
}

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

    #[test]
    fn normalize_optional_submit_field_trims_and_drops_blank_values() {
        assert_eq!(normalize_optional_submit_field("   \n\t  ".to_string()), None);
        assert_eq!(
            normalize_optional_submit_field("  https://example.com/page  ".to_string()),
            Some("https://example.com/page".to_string())
        );
    }
}