"""Unit tests for the model-free RX task watcher."""

from __future__ import annotations

import json
from pathlib import Path

import pytest

from tools.rx_agent_watcher import (
    ApprovalDecision,
    ManualExecutor,
    WatcherState,
    handle_task,
    is_new_task,
    load_state,
    mark_completed,
    parse_task,
    request_approval,
    request_stop,
    save_state,
)


HEAD = "1" * 40


def task_text(*, task_id: str = "WATCHER_TEST_001", rf_tx: str = "NO") -> str:
    hardware = "YES" if rf_tx == "YES" else "NO"
    risk_level = "RED" if rf_tx == "YES" else "GREEN"
    return f"""TASK_ID = {task_id}
TASK_TITLE = Watcher test
SOURCE_BRANCH = video-development
EXPECTED_HEAD = {HEAD}
REQUIRES_APPROVAL = YES
HARDWARE_ACCESS = {hardware}
RF_RX = NO
RF_TX = {rf_tx}
ALLOW_COMMIT = NO
ALLOW_PUSH = RX_RESULT_ONLY
RISK_LEVEL = {risk_level}

# Body
Do nothing.
"""


def responses(*values: str):
    iterator = iter(values)
    return lambda _prompt: next(iterator)


def test_task_parsing_and_validation() -> None:
    task = parse_task(task_text())
    assert task.task_id == "WATCHER_TEST_001"
    assert task.source_branch == "video-development"
    assert task.safety_level == "GREEN"
    assert not task.rf_tx
    with pytest.raises(ValueError, match="missing task header"):
        parse_task("TASK_ID = INCOMPLETE")
    with pytest.raises(ValueError, match="duplicate"):
        parse_task(task_text().replace(
            "TASK_TITLE = Watcher test",
            "TASK_TITLE = Watcher test\nTASK_TITLE = Duplicate",
        ))


def test_state_persistence_and_completion(tmp_path: Path) -> None:
    path = tmp_path / "state.json"
    original = WatcherState(last_seen_task_id="WATCHER_TEST_001", running=True, pid=123)
    save_state(path, original)
    assert load_state(path) == original
    mark_completed(path, "WATCHER_TEST_001")
    completed = load_state(path)
    assert completed.last_completed_task_id == "WATCHER_TEST_001"
    assert completed.deferred_task_id is None
    with pytest.raises(ValueError, match="last seen"):
        mark_completed(path, "WATCHER_TEST_002")


def test_approval_defer_stop_and_yellow_approve() -> None:
    green = parse_task(task_text())
    assert request_approval(green, responses("D"), lambda _text: None) == ApprovalDecision.DEFER
    assert request_approval(green, responses("S"), lambda _text: None) == ApprovalDecision.STOP
    yellow_text = task_text().replace(
        "HARDWARE_ACCESS = NO", "HARDWARE_ACCESS = YES"
    ).replace("RISK_LEVEL = GREEN", "RISK_LEVEL = YELLOW")
    yellow = parse_task(yellow_text)
    assert yellow.safety_level == "YELLOW"
    assert request_approval(yellow, responses("A"), lambda _text: None) == ApprovalDecision.APPROVE


def test_rf_tx_red_gate_requires_separate_phrase() -> None:
    red = parse_task(task_text(rf_tx="YES"))
    assert red.safety_level == "RED"
    assert request_approval(
        red, responses("A", "yes"), lambda _text: None
    ) == ApprovalDecision.BLOCKED
    assert request_approval(
        red, responses("A", "AUTHORIZE RF TX"), lambda _text: None
    ) == ApprovalDecision.APPROVE


def test_non_rf_red_task_also_requires_separate_phrase() -> None:
    text = task_text(task_id="FIRMWARE_TEST_001").replace(
        "RISK_LEVEL = GREEN", "RISK_LEVEL = RED"
    )
    red = parse_task(text)
    assert not red.rf_tx
    assert request_approval(
        red, responses("A", "AUTHORIZE RF TX"), lambda _text: None
    ) == ApprovalDecision.BLOCKED
    assert request_approval(
        red, responses("A", "AUTHORIZE FIRMWARE_TEST_001"), lambda _text: None
    ) == ApprovalDecision.APPROVE


def test_duplicate_task_is_suppressed_without_prompt(tmp_path: Path) -> None:
    text = task_text()
    task = parse_task(text)
    state = WatcherState(last_seen_task_id=task.task_id)
    assert not is_new_task(task, state)

    def forbidden_input(_prompt: str) -> str:
        raise AssertionError("duplicate task prompted the user")

    status, returned = handle_task(
        text,
        HEAD,
        state,
        ManualExecutor(tmp_path),
        dry_run=True,
        input_function=forbidden_input,
        output_function=lambda _text: None,
    )
    assert status == "DUPLICATE_SUPPRESSED"
    assert returned == state
    assert list(tmp_path.iterdir()) == []


def test_defer_persists_seen_id_and_creates_no_result(tmp_path: Path) -> None:
    state = WatcherState()
    status, state = handle_task(
        task_text(),
        HEAD,
        state,
        ManualExecutor(tmp_path),
        dry_run=True,
        input_function=responses("D"),
        output_function=lambda _text: None,
    )
    assert status == "DEFERRED"
    assert state.last_seen_task_id == "WATCHER_TEST_001"
    assert state.deferred_task_id == "WATCHER_TEST_001"
    assert list(tmp_path.iterdir()) == []


def test_dry_run_approval_writes_prompt_and_matching_results(tmp_path: Path) -> None:
    status, state = handle_task(
        task_text(),
        HEAD,
        WatcherState(),
        ManualExecutor(tmp_path),
        dry_run=True,
        input_function=responses("A"),
        output_function=lambda _text: None,
    )
    directory = tmp_path / "WATCHER_TEST_001"
    assert status == "PREPARED"
    assert state.last_seen_task_id == "WATCHER_TEST_001"
    assert state.last_completed_task_id is None
    assert (directory / "TASK.md").exists()
    markdown = (directory / "RX_RESULT.md").read_text(encoding="utf-8")
    result = json.loads((directory / "RX_RESULT.json").read_text(encoding="utf-8"))
    assert "TASK_STATUS = DRY_RUN_PREPARED" in markdown
    assert result["task_status"] == "DRY_RUN_PREPARED"
    assert result["rf_tx"] == "NO"
    assert result["hardware_actions"] == []
    with pytest.raises(FileExistsError):
        ManualExecutor(tmp_path).prepare(
            parse_task(task_text()), task_text(), HEAD, dry_run=True
        )


def test_stop_request_for_idle_watcher(tmp_path: Path) -> None:
    state_path = tmp_path / "state.json"
    save_state(state_path, WatcherState(running=False, pid=None))
    assert request_stop(state_path, timeout_s=0.1)
    assert state_path.with_suffix(".json.stop").read_text(encoding="ascii") == "STOP\n"