"""Tests for tool fixation detection."""

import pytest
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).resolve().parent.parent))

from agent.tool_fixation_detector import ToolFixationDetector, get_fixation_detector


class TestFixationDetection:
    def test_no_fixation_below_threshold(self):
        d = ToolFixationDetector(threshold=5)
        for i in range(4):
            assert d.record("execute_code") is None

    def test_fixation_at_threshold(self):
        d = ToolFixationDetector(threshold=3)
        d.record("execute_code")
        d.record("execute_code")
        nudge = d.record("execute_code")
        assert nudge is not None
        assert "execute_code" in nudge
        assert "3 times" in nudge

    def test_fixation_above_threshold(self):
        d = ToolFixationDetector(threshold=3)
        d.record("execute_code")
        d.record("execute_code")
        d.record("execute_code")  # threshold hit
        nudge = d.record("execute_code")  # still nudging
        assert nudge is not None

    def test_streak_resets_on_different_tool(self):
        d = ToolFixationDetector(threshold=3)
        d.record("execute_code")
        d.record("execute_code")
        d.record("terminal")  # breaks streak
        assert d._streak_count == 1
        assert d._current_streak == "terminal"

    def test_nudges_sent_counter(self):
        d = ToolFixationDetector(threshold=2)
        d.record("a")
        d.record("a")  # nudge 1
        d.record("a")  # nudge 2
        assert d.nudges_sent == 2

    def test_events_recorded(self):
        d = ToolFixationDetector(threshold=2)
        d.record("x")
        d.record("x")
        assert len(d.events) == 1
        assert d.events[0].tool_name == "x"
        assert d.events[0].streak_length == 2

    def test_report(self):
        d = ToolFixationDetector(threshold=2)
        d.record("x")
        d.record("x")
        report = d.format_report()
        assert "x" in report

    def test_reset(self):
        d = ToolFixationDetector(threshold=2)
        d.record("x")
        d.record("x")
        d.reset()
        assert d._streak_count == 0
        assert d._current_streak == ""

    def test_singleton(self):
        d1 = get_fixation_detector()
        d2 = get_fixation_detector()
        assert d1 is d2