//! 纯 UI 状态机的测试：思考计时、工具执行、块构建与折叠。
//! Tests for the pure UI state machine: thinking timings, tool executions,
//! block building and collapsing.

use focus_core::event::AgentEvent;
use focus_core::model::*;
use focus_core::tool::{ToolResult, ToolUpdate};
use focus_json::JsonValue;
use focus_tui::state::*;
use std::collections::{HashMap, HashSet};
use std::sync::atomic::{AtomicU64, Ordering};
use std::sync::Arc;

/// 可推进的假时钟。
/// An advanceable fake clock.
struct FakeClock(std::sync::Arc<AtomicU64>);

impl FakeClock {
    fn new() -> Self {
        Self(std::sync::Arc::new(AtomicU64::new(0)))
    }
    fn clock(&self) -> Clock {
        let inner = self.0.clone();
        Arc::new(move || inner.load(Ordering::SeqCst))
    }
    fn advance(&self, ms: u64) {
        self.0.fetch_add(ms, Ordering::SeqCst);
    }
}

fn thinking_block(text: &str) -> ContentBlock {
    ContentBlock::Thinking(ThinkingContent {
        thinking: text.into(),
        signature: None,
        redacted: false,
    })
}

fn assistant(content: Vec<ContentBlock>) -> AssistantMessage {
    AssistantMessage {
        content,
        model: "m".into(),
        usage: Usage::default(),
        stop_reason: StopReason::Stop,
        error_message: None,
        timestamp: 0,
    }
}

#[test]
fn thinking_duration_is_measured() {
    let fc = FakeClock::new();
    let mut rs = RunState::new(fc.clock());

    // 思考块出现（t=0）。
    // Thinking block appears (t=0).
    let p1 = assistant(vec![thinking_block("hmm")]);
    rs.on_agent_event(&AgentEvent::MessageStart {
        message: Message::Assistant(p1),
    });
    fc.advance(500);
    // 思考 + 文本（思考结束于 t=500）。
    // Thinking + text (thinking ends at t=500).
    let p2 = assistant(vec![thinking_block("hmm"), ContentBlock::text("answer")]);
    rs.on_agent_event(&AgentEvent::MessageUpdate {
        message: Message::Assistant(p2),
        event_type: "text_start".into(),
    });
    fc.advance(300);
    let p3 = assistant(vec![
        thinking_block("hmm"),
        ContentBlock::text("answer extended"),
    ]);
    rs.on_agent_event(&AgentEvent::MessageUpdate {
        message: Message::Assistant(p3.clone()),
        event_type: "text_delta".into(),
    });
    rs.on_agent_event(&AgentEvent::MessageEnd {
        message: Message::Assistant(p3.clone()),
    });
    rs.finalize();

    let timing = rs.thinking.get(&(0, 0)).expect("thinking timing");
    assert_eq!(timing.duration_ms(), 500);
}

#[test]
fn tool_execution_tracks_summary_output_and_duration() {
    let fc = FakeClock::new();
    let mut rs = RunState::new(fc.clock());

    let mut args = JsonValue::obj();
    args.insert("command", "cargo test".into()).ok();
    rs.on_agent_event(&AgentEvent::ToolExecutionStart {
        tool_call_id: "call_1".into(),
        tool_name: "shell".into(),
        args,
    });
    assert_eq!(rs.tool_execs.len(), 1);
    assert_eq!(rs.tool_execs[0].status, ExecStatus::Running);
    assert_eq!(rs.tool_execs[0].summary, "shell: cargo test");

    fc.advance(100);
    rs.on_agent_event(&AgentEvent::ToolExecutionUpdate {
        tool_call_id: "call_1".into(),
        tool_name: "shell".into(),
        partial_result: ToolUpdate {
            content: vec![ContentBlock::text("compiling…")],
            details: JsonValue::obj(),
        },
    });
    fc.advance(100);
    rs.on_agent_event(&AgentEvent::ToolExecutionUpdate {
        tool_call_id: "call_1".into(),
        tool_name: "shell".into(),
        partial_result: ToolUpdate {
            content: vec![ContentBlock::text("2 passed")],
            details: JsonValue::obj(),
        },
    });
    rs.on_agent_event(&AgentEvent::ToolExecutionEnd {
        tool_call_id: "call_1".into(),
        tool_name: "shell".into(),
        result: ToolResult::text("2 passed"),
        is_error: false,
    });

    let exec = &rs.tool_execs[0];
    assert_eq!(exec.status, ExecStatus::Done);
    assert_eq!(exec.duration_ms(), Some(200));
    assert_eq!(exec.output, "compiling…\n2 passed");
    assert_eq!(exec.result_text, "2 passed");
    assert!(!exec.is_error);
}

#[test]
fn blocks_are_collapsed_by_default_and_summarized() {
    let mut expanded = HashSet::new();
    let transcript = vec![
        Message::user_text("hi"),
        Message::Assistant(assistant(vec![
            thinking_block("secret reasoning"),
            ContentBlock::ToolCall(ToolCall {
                id: "c1".into(),
                name: "read".into(),
                arguments: {
                    let mut a = JsonValue::obj();
                    a.insert("path", "src/main.rs".into()).ok();
                    a
                },
            }),
        ])),
    ];
    let blocks = build_blocks(&transcript, &HashMap::new(), None, &expanded);

    // 折叠态：思考块只显示摘要（无展开文本），工具调用只显示摘要。
    // Collapsed: thinking shows only its summary; tool calls show only their
    // summary.
    for b in &blocks {
        match b {
            UiBlock::Thinking {
                text,
                expanded,
                duration_ms,
                ..
            } => {
                assert!(!expanded);
                assert_eq!(text, "secret reasoning");
                assert_eq!(*duration_ms, None);
            }
            UiBlock::ToolCall {
                summary, expanded, ..
            } => {
                assert!(!expanded);
                assert_eq!(summary, "read src/main.rs");
            }
            _ => {}
        }
    }

    // 展开后：expanded 标记生效。
    // After expanding: the expanded flag takes effect.
    for b in &blocks {
        if let Some(id) = b.id() {
            toggle_expanded(&mut expanded, id);
        }
    }
    let blocks = build_blocks(&transcript, &HashMap::new(), None, &expanded);
    let mut expanded_count = 0;
    for b in &blocks {
        if let UiBlock::Thinking { expanded, .. } | UiBlock::ToolCall { expanded, .. } = b {
            assert!(*expanded);
            expanded_count += 1;
        }
    }
    assert_eq!(expanded_count, 2);
}

#[test]
fn build_blocks_includes_live_run() {
    let fc = FakeClock::new();
    let mut rs = RunState::new(fc.clock());
    rs.on_agent_event(&AgentEvent::MessageStart {
        message: Message::Assistant(assistant(vec![thinking_block("why")])),
    });
    fc.advance(250);
    rs.on_agent_event(&AgentEvent::MessageUpdate {
        message: Message::Assistant(assistant(vec![
            thinking_block("why"),
            ContentBlock::text("because"),
        ])),
        event_type: "text_start".into(),
    });

    let blocks = build_blocks(&[], &HashMap::new(), Some(&rs), &HashSet::new());
    // live 头 + 思考 + 文本。
    // live header + thinking + text.
    let thinking = blocks
        .iter()
        .find_map(|b| match b {
            UiBlock::Thinking {
                duration_ms, text, ..
            } => Some((text.clone(), *duration_ms)),
            _ => None,
        })
        .expect("live thinking block");
    assert_eq!(thinking.0, "why");
    // 思考块结束后有文本 → 已有耗时。
    // A later block appeared → the duration is settled.
    assert_eq!(thinking.1, Some(250));
}

/// working 阶段检测：运行中的工具 > 思考中 > 流式输出。
/// Working-phase detection: running tool > thinking > streaming.
#[test]
fn working_phase_detection() {
    let fc = FakeClock::new();
    let mut rs = RunState::new(fc.clock());
    // 无状态 → 一般工作。
    // No state → generic work.
    assert_eq!(rs.working_phase(), "working…");

    // 思考中。
    // Thinking.
    rs.on_agent_event(&AgentEvent::MessageStart {
        message: Message::Assistant(assistant(vec![thinking_block("hmm")])),
    });
    assert_eq!(rs.working_phase(), "thinking…");

    // 流式输出（思考后出现文本）。
    // Streaming (text after thinking).
    rs.on_agent_event(&AgentEvent::MessageUpdate {
        message: Message::Assistant(assistant(vec![
            thinking_block("hmm"),
            ContentBlock::text("answer"),
        ])),
        event_type: "text_start".into(),
    });
    assert_eq!(rs.working_phase(), "streaming…");

    // 运行中的工具优先。
    // A running tool takes precedence.
    let mut args = JsonValue::obj();
    args.insert("command", "cargo test".into()).ok();
    rs.on_agent_event(&AgentEvent::ToolExecutionStart {
        tool_call_id: "c1".into(),
        tool_name: "shell".into(),
        args,
    });
    assert_eq!(rs.working_phase(), "shell: cargo test…");

    // 工具结束后回到流式。
    // Back to streaming after the tool finishes.
    rs.on_agent_event(&AgentEvent::ToolExecutionEnd {
        tool_call_id: "c1".into(),
        tool_name: "shell".into(),
        result: ToolResult::text("ok"),
        is_error: false,
    });
    assert_eq!(rs.working_phase(), "streaming…");
}

/// 错误消息必须渲染出具体的错误文本（而不是只有消息头）。
/// An error message must render its concrete error text (not just a header).
#[test]
fn error_message_renders_as_error_block() {
    let transcript = vec![Message::Assistant(AssistantMessage {
        content: Vec::new(),
        model: "m".into(),
        usage: Usage::default(),
        stop_reason: StopReason::Error,
        error_message: Some("http error 400: bad request detail".into()),
        timestamp: 0,
    })];
    let blocks = build_blocks(&transcript, &HashMap::new(), None, &HashSet::new());
    let err = blocks
        .iter()
        .find_map(|b| match b {
            UiBlock::Error { text, .. } => Some(text.clone()),
            _ => None,
        })
        .expect("error block");
    assert_eq!(err, "http error 400: bad request detail");
}