//! 端到端集成：Agent + AnthropicProvider + mock transport 跑完整工具回合。
//! End-to-end integration: Agent + AnthropicProvider + mock transport running
//! a full tool-call turn.

mod common;

use focus_core::event::VecSink;
use focus_core::model::*;
use focus_core::tool::{Tool, ToolEffects, ToolRegistry, ToolResult, ToolUpdateSink};
use focus_core::{Agent, AgentConfig, CoreError};
use focus_json::JsonValue;
use focus_providers::anthropic::AnthropicProvider;
use focus_providers::config::ProviderConfig;
use std::sync::Arc;

/// 记录调用参数的 echo 工具。
/// An echo tool that records its arguments.
#[derive(Debug, Default)]
struct EchoTool {
    calls: Arc<std::sync::Mutex<Vec<JsonValue>>>,
}

impl Clone for EchoTool {
    fn clone(&self) -> Self {
        Self {
            calls: self.calls.clone(),
        }
    }
}

impl Tool for EchoTool {
    fn name(&self) -> &str {
        "echo"
    }
    fn description(&self) -> &str {
        "echoes the arguments back"
    }
    fn parameters(&self) -> JsonValue {
        let mut o = JsonValue::obj();
        o.insert("type", "object".into()).ok();
        let mut props = JsonValue::obj();
        props.insert("text", JsonValue::Str("the text".into())).ok();
        o.insert("properties", props).ok();
        o
    }
    fn effects(&self) -> ToolEffects {
        ToolEffects::READ
    }
    fn execute(
        &self,
        _id: &str,
        args: &JsonValue,
        _u: Option<&ToolUpdateSink<'_>>,
    ) -> Result<ToolResult, CoreError> {
        self.calls.lock().unwrap().push(args.clone());
        Ok(ToolResult::text(format!(
            "echo: {}",
            args.get_str("text").unwrap_or("")
        )))
    }
}

/// 回合 1：模型调用 echo 工具；回合 2：模型给出最终文本。
/// Turn 1: the model calls the echo tool; turn 2: the model gives final text.
#[test]
fn agent_runs_full_tool_turn_against_anthropic() {
    let mut mock = common::MockTransport::new();
    // 回合 1：tool_use → 回合 2：文本回答。
    // Turn 1: tool_use → turn 2: text answer.
    mock.push_body(
        "event: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"usage\":{\"input_tokens\":20}}}\n\n\
         event: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"tool_use\",\"id\":\"toolu_1\",\"name\":\"echo\",\"input\":{}}}\n\n\
         event: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"input_json_delta\",\"partial_json\":\"{\\\"text\\\":\\\"world\\\"}\"}}\n\n\
         event: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\n\
         event: message_delta\ndata: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"tool_use\"},\"usage\":{\"output_tokens\":8}}\n\n\
         event: message_stop\ndata: {\"type\":\"message_stop\"}\n\n",
    );
    mock.push_body(
        "event: message_start\ndata: {\"type\":\"message_start\",\"message\":{\"usage\":{\"input_tokens\":30}}}\n\n\
         event: content_block_start\ndata: {\"type\":\"content_block_start\",\"index\":0,\"content_block\":{\"type\":\"text\",\"text\":\"\"}}\n\n\
         event: content_block_delta\ndata: {\"type\":\"content_block_delta\",\"index\":0,\"delta\":{\"type\":\"text_delta\",\"text\":\"all done\"}}\n\n\
         event: content_block_stop\ndata: {\"type\":\"content_block_stop\",\"index\":0}\n\n\
         event: message_delta\ndata: {\"type\":\"message_delta\",\"delta\":{\"stop_reason\":\"end_turn\"},\"usage\":{\"output_tokens\":4}}\n\n\
         event: message_stop\ndata: {\"type\":\"message_stop\"}\n\n",
    );

    let provider =
        AnthropicProvider::with_transport(ProviderConfig::new("sk-test"), Arc::new(mock.clone()));
    let config = AgentConfig {
        model: "claude-sonnet-4".into(),
        system_prompt: "You are helpful.".into(),
        max_tokens: Some(1024),
        ..Default::default()
    };
    let echo = EchoTool::default();
    let calls = echo.calls.clone();
    let tools = ToolRegistry::with(Box::new(echo));
    let mut agent = Agent::new(config, Box::new(provider), tools);
    let mut sink = VecSink::new();

    agent
        .prompt("please echo world", &mut sink)
        .expect("run failed");

    // 两次回合、一次工具执行。
    // Two turns, one tool execution.
    assert_eq!(sink.count("turn_end"), 2);
    assert_eq!(sink.count("tool_execution_end"), 1);

    let msgs = agent.messages();
    assert_eq!(msgs.len(), 4);
    assert!(matches!(msgs[0], Message::User(_)));
    assert!(matches!(
        &msgs[1],
        Message::Assistant(a) if a.content.iter().any(|c| c.as_tool_call().is_some())
    ));
    assert!(matches!(
        &msgs[2],
        Message::ToolResult(tr) if tr.tool_name == "echo" && !tr.is_error
    ));
    let final_text = match &msgs[3] {
        Message::Assistant(a) => a
            .content
            .iter()
            .find_map(|c| c.as_text())
            .map(|t| t.text.clone()),
        _ => None,
    };
    assert_eq!(final_text.as_deref(), Some("all done"));

    // 工具确实收到了模型传入的参数。
    // The tool actually received the model's arguments.
    let recorded = calls.lock().unwrap();
    assert_eq!(recorded.len(), 1);
    assert_eq!(recorded[0].get_str("text"), Some("world"));

    // 两个回合都发出了 HTTP 请求。
    // Both turns issued HTTP requests.
    assert_eq!(mock.request_count(), 2);
}