import builtins
import sys
from pathlib import Path

import pytest

from pam_deploy_graph.agent import PamDeployAgent
from pam_deploy_graph.fake_runner import FakeActionRunner
from pam_deploy_graph.interactive import InteractiveCliSession, _build_prompt_input
from pam_deploy_graph.models import LlmActionAnalysis, LlmIntentResult


PARAMS = {
    "HOME_BASE_URL": "https://pam.home.example.com",
    "CLIENT_ID": "client",
    "CLIENT_SECRET": "secret",
    "AIRPORT_CODE": "HET",
    "APP_NAME": "PAM",
    "MODULE_NAME": "Node",
    "VERSION_NUMBER": "2.0.5",
    "ZIP_FILE_PATH": "C:/pkg.zip",
}


class BlockingReviewLlmClient:
    def analyze_action_result(self, *, action, result, state_summary):
        return LlmActionAnalysis(
            action=action,
            has_anomaly=True,
            severity="high",
            possible_reason="review blocked",
            suggested_action="stop and inspect",
            requires_confirmation=True,
            should_continue=False,
            notes=["blocked by test llm"],
        )


class FakeTestableLlmClient:
    def __init__(self) -> None:
        self.requests: list[str] = []

    def understand_request(self, text: str) -> LlmIntentResult:
        self.requests.append(text)
        return LlmIntentResult(
            intent="deploy",
            mode_preference="MCP",
            strategy_preference="hybrid_node_mcp",
            confidence=0.91,
            reasons=["test ok"],
        )

    def extract_params(self, text, base_params=None):
        raise AssertionError("llm test should only call understand_request")

    def generate_plan(self, *, params, intent, strategy):
        raise AssertionError("llm test should only call understand_request")

    def analyze_action_result(self, *, action, result, state_summary):
        return LlmActionAnalysis(action=action)


class FlakyVerifyRunner(FakeActionRunner):
    """第一次 verify-ip 失败，后续恢复成功，用于覆盖断点重试。"""

    def __init__(self) -> None:
        super().__init__()
        self.verify_calls = 0

    def _fixture_for(self, action, kwargs):
        if action == "verify-ip" and kwargs.get("ip") == "192.168.1.10":
            self.verify_calls += 1
            if self.verify_calls == 1:
                return {
                    "ACTION": "verify-ip",
                    "IP": "192.168.1.10",
                    "SUCCESS": "false",
                    "MESSAGE": "health check failed",
                }
        return super()._fixture_for(action, kwargs)


class ChatProgressRunner(FakeActionRunner):
    """让 chat fake 部署产生一次可见的进度更新。"""

    def __init__(self) -> None:
        super().__init__()
        self.download_progress = ["40", "100"]

    def _fixture_for(self, action, kwargs):
        if action == "poll-download-progress":
            rate = self.download_progress.pop(0) if self.download_progress else "100"
            return {
                "ACTION": action,
                "STEP": "DONE" if rate == "100" else "RUNNING",
                "RATE_OF_PROGRESS": rate,
                "MSG": "success" if rate == "100" else "running",
                "MESSAGE": f"download {rate}%",
            }
        return super()._fixture_for(action, kwargs)


def run_session(session: InteractiveCliSession, inputs: list[str]) -> list[str]:
    output: list[str] = []
    iterator = iter(inputs)
    session.input = lambda _prompt: next(iterator)
    session.output = output.append
    session.run()
    return output


def test_chat_analyzes_natural_language_and_updates_context(tmp_path: Path):
    session = InteractiveCliSession(
        agent=PamDeployAgent(),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["analyze please use MCP deploy 192.168.1.10", "exit"])

    assert session.strategy == "hybrid_node_mcp"
    assert session.target_ips == ["192.168.1.10"]
    assert any("执行请输 run" in item for item in output)


def test_chat_run_executes_fake_deploy_and_writes_checkpoint(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=FakeActionRunner()),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    run_session(session, ["run", "yes", "yes", "yes", "exit"])

    assert checkpoint.exists()
    assert session.state is not None
    assert session.state.pending_confirmation == ""
    assert all(item["status"] == "SUCCESS" for item in session.state.ip_states.values())


def test_chat_run_prints_action_progress(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=FakeActionRunner()),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "exit"])

    assert any("开始执行 action: get-token" in item for item in output)
    assert any("完成 action: verify-ip" in item for item in output)
    assert any("开始分析 action 结果: get-token" in item for item in output)
    assert any("分析完成: verify-ip" in item for item in output)


def test_chat_run_prints_progress_poll_updates(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=ChatProgressRunner()),
        params={**PARAMS, "POLL_INTERVAL_SEC": 0},
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "exit"])

    assert any("进度更新: poll-download-progress" in item for item in output)
    assert any("RATE_OF_PROGRESS=40" in item for item in output)
    assert session.state is not None
    assert "poll-download-progress" in session.state.completed_global_steps


def test_chat_greeting_does_not_trigger_structured_analysis(tmp_path: Path):
    session = InteractiveCliSession(
        agent=PamDeployAgent(),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["你好", "exit"])

    assert session.last_analysis is None
    assert any("可以输入 help 查看命令" in item for item in output)
    assert not any("已生成结构化理解" in item for item in output)


def test_chat_preflight_blocks_missing_zip_path_before_confirm(tmp_path: Path):
    missing_package = tmp_path / "missing.zip"
    session = InteractiveCliSession(
        agent=PamDeployAgent(),
        params={**PARAMS, "ZIP_FILE_PATH": str(missing_package)},
        strategy="script_only",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["run", "exit"])

    assert session.state is None
    assert any("执行前检查未通过" in item for item in output)
    assert any("ZIP_FILE_PATH 不存在" in item for item in output)


def test_chat_action_failure_does_not_report_langgraph_unavailable(tmp_path: Path):
    fake = FakeActionRunner({"upload-package": {"ACTION": "upload-package"}})
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=fake),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "exit"])

    assert session.state is not None
    assert session.state.last_failed_step == "upload-package"
    assert any("执行已停止" in item for item in output)
    assert not any("LangGraph 确认运行器不可用" in item for item in output)


def test_chat_resume_retries_failed_ip_without_rollback(tmp_path: Path):
    fake = FlakyVerifyRunner()
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=fake),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "resume", "exit"])

    assert session.state is not None
    assert session.state.pending_confirmation == ""
    assert session.state.paused is False
    assert session.state.ip_states["192.168.1.10"]["rollback_status"] == "ROLLBACK_NOT_RUN"
    assert session.state.ip_states["192.168.1.10"]["status"] == "SUCCESS"
    assert session.state.ip_states["192.168.1.11"]["status"] == "SUCCESS"
    assert not any(call[0] == "rollback-ip" for call in fake.calls)
    assert any("如需回滚，输入 rollback 192.168.1.10" in item for item in output)


def test_chat_explicit_rollback_command_rolls_back_failed_ip(tmp_path: Path):
    fake = FakeActionRunner(
        {
            "verify-ip:192.168.1.10": {
                "ACTION": "verify-ip",
                "IP": "192.168.1.10",
                "SUCCESS": "false",
                "MESSAGE": "health check failed",
            }
        }
    )
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=fake),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "rollback", "resume", "exit"])

    assert session.state is not None
    assert session.state.pending_confirmation == ""
    assert session.state.ip_states["192.168.1.10"]["rollback_status"] == "ROLLBACK_DONE"
    assert session.state.ip_states["192.168.1.11"]["status"] == "SUCCESS"
    assert any(call[0] == "rollback-ip" for call in fake.calls)
    assert any("回滚已完成；如需继续主流程，输入 resume" in item for item in output)


def test_chat_params_events_and_checkpoint_commands(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=FakeActionRunner(), action_analysis_enabled=True),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    output = run_session(
        session,
        [
            "params",
            "llm action-analysis on",
            "run",
            "yes",
            "yes",
            "yes",
            "events 20",
            "list checkpoints",
            "load checkpoint " + str(checkpoint),
            "exit",
        ],
    )

    assert session.state is not None
    assert any("CLIENT_SECRET: ***" in item for item in output)
    assert any("ACTION_ANALYSIS" in item for item in output)
    assert any("checkpoint 列表" in item for item in output)


def test_chat_load_params_hot_updates_running_state_and_config(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    params_file = tmp_path / "params.txt"
    params_file.write_text(
        "\n".join(
            [
                "APP_NAME=PAM-HOT",
                f"ZIP_FILE_PATH={tmp_path / 'updated.zip'}",
            ]
        )
        + "\n",
        encoding="utf-8",
    )
    session = InteractiveCliSession(
        agent=PamDeployAgent(fake_runner=FakeActionRunner()),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    run_session(
        session,
        [
            "run",
            "yes",
            "yes",
            "yes",
            "load params " + str(params_file),
            "exit",
        ],
    )

    assert session.state is not None
    assert session.state.params["APP_NAME"] == "PAM-HOT"
    assert session.state.params["ZIP_FILE_PATH"] == str((tmp_path / "updated.zip").resolve())
    config_text = Path(session.state.config_path).read_text(encoding="utf-8")
    assert "APP_NAME=PAM-HOT" in config_text
    assert f"ZIP_FILE_PATH={(tmp_path / 'updated.zip').resolve()}" in config_text


def test_chat_llm_review_block_message_is_visible(tmp_path: Path):
    checkpoint = tmp_path / "checkpoint.json"
    session = InteractiveCliSession(
        agent=PamDeployAgent(
            fake_runner=FakeActionRunner(),
            llm_client=BlockingReviewLlmClient(),
        ),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(checkpoint),
    )

    output = run_session(session, ["run", "yes", "yes", "yes", "exit"])

    assert session.state is not None
    assert session.state.paused is True
    assert session.state.pause_reason == "llm_review_blocked"
    assert any("当前流程已暂停: llm_review_blocked" in item for item in output)
    assert any("- suggestion: stop and inspect" in item for item in output)
    assert any("如需继续，输入 resume" in item for item in output)


def test_chat_llm_test_command_uses_current_client(tmp_path: Path):
    llm = FakeTestableLlmClient()
    session = InteractiveCliSession(
        agent=PamDeployAgent(llm_client=llm),
        params=PARAMS,
        strategy="fake",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["llm test 检查模型", "exit"])

    assert llm.requests == ["检查模型"]
    assert any("正在测试 LLM: FakeTestableLlmClient" in item for item in output)
    assert any("LLM 测试通过" in item for item in output)
    assert any("- intent: deploy" in item for item in output)
    assert any("- strategy: hybrid_node_mcp" in item for item in output)


def test_chat_can_hot_load_mcp_config(tmp_path: Path):
    mcp_config = tmp_path / "mcp.json"
    mcp_config.write_text('{"transport": "stdio", "command": "python"}', encoding="utf-8")
    session = InteractiveCliSession(
        agent=PamDeployAgent(),
        params=PARAMS,
        strategy="hybrid_node_mcp",
        checkpoint_path=str(tmp_path / "checkpoint.json"),
    )

    output = run_session(session, ["mcp config " + mcp_config.as_posix(), "exit"])

    assert session.agent.mcp_runner is not None
    assert session.agent.router.mcp_runner is not None
    assert any("MCP 配置已加载" in item for item in output)


def test_prompt_history_creates_runtime_dir(tmp_path: Path, monkeypatch):
    pytest.importorskip("prompt_toolkit")
    monkeypatch.chdir(tmp_path)

    prompt = _build_prompt_input(builtins.input)

    assert callable(prompt)
    assert (tmp_path / "runtime").is_dir()


def test_prompt_toolkit_enabled_when_frozen(tmp_path: Path, monkeypatch):
    pytest.importorskip("prompt_toolkit")
    monkeypatch.chdir(tmp_path)
    monkeypatch.setattr(sys, "frozen", True, raising=False)

    prompt = _build_prompt_input(builtins.input)

    assert callable(prompt)
    assert prompt is not builtins.input
    assert (tmp_path / "runtime").is_dir()