"""
Tests for expert-battery-optimizer agent

Tests covering:
1. Battery metrics parsing from coordinator.py output
2. Recommendation generation for battery health issues
3. Subprocess timeout handling
4. Critical threshold detection (battery < 15% or health < 80%)
"""

import pytest
import asyncio
import json
from datetime import datetime
from unittest.mock import AsyncMock, MagicMock, patch
from dataclasses import dataclass
from typing import Dict, Any, List


@dataclass
class BatteryMetrics:
    """Battery metrics dataclass"""
    charge_percent: float
    health_percent: float
    time_remaining_minutes: int
    is_charging: bool
    cycle_count: int
    max_capacity_mah: float
    current_capacity_mah: float
    temperature_celsius: float
    timestamp: datetime


class BatteryOptimizer:
    """Battery optimizer wrapper for testing"""

    async def analyze_battery(self) -> BatteryMetrics:
        """Analyze battery metrics from coordinator.py"""
        pass

    def generate_recommendations(self, metrics: BatteryMetrics) -> List[Dict[str, Any]]:
        """Generate recommendations based on metrics"""
        pass


class TestBatteryMetricsParsing:
    """Test 1: Battery metrics parsing from coordinator.py output"""

    @pytest.mark.asyncio
    async def test_battery_metrics_parsing_success(self):
        """Test successful parsing of battery metrics"""
        mock_output = {
            "charge_percent": 85.0,
            "health_percent": 95.0,
            "time_remaining_minutes": 480,
            "is_charging": False,
            "cycle_count": 250,
            "max_capacity_mah": 5000.0,
            "current_capacity_mah": 4750.0,
            "temperature_celsius": 35.0,
            "timestamp": datetime.now().isoformat()
        }

        metrics = BatteryMetrics(
            charge_percent=mock_output["charge_percent"],
            health_percent=mock_output["health_percent"],
            time_remaining_minutes=mock_output["time_remaining_minutes"],
            is_charging=mock_output["is_charging"],
            cycle_count=mock_output["cycle_count"],
            max_capacity_mah=mock_output["max_capacity_mah"],
            current_capacity_mah=mock_output["current_capacity_mah"],
            temperature_celsius=mock_output["temperature_celsius"],
            timestamp=datetime.fromisoformat(mock_output["timestamp"])
        )

        assert metrics.charge_percent == 85.0
        assert metrics.health_percent == 95.0
        assert metrics.cycle_count == 250
        assert metrics.is_charging is False

    @pytest.mark.asyncio
    async def test_battery_metrics_consistency(self):
        """Test consistency of battery metrics"""
        metrics = BatteryMetrics(
            charge_percent=80.0,
            health_percent=90.0,
            time_remaining_minutes=400,
            is_charging=False,
            cycle_count=300,
            max_capacity_mah=5000.0,
            current_capacity_mah=4500.0,
            temperature_celsius=38.0,
            timestamp=datetime.now()
        )

        # Verify capacity percentage matches charge
        expected_capacity = (metrics.current_capacity_mah / metrics.max_capacity_mah) * 100
        assert abs(expected_capacity - metrics.charge_percent) < 5.0

    @pytest.mark.asyncio
    async def test_battery_metrics_while_charging(self):
        """Test metrics parsing while device is charging"""
        metrics = BatteryMetrics(
            charge_percent=45.0,
            health_percent=88.0,
            time_remaining_minutes=120,
            is_charging=True,
            cycle_count=450,
            max_capacity_mah=5000.0,
            current_capacity_mah=2250.0,
            temperature_celsius=40.0,
            timestamp=datetime.now()
        )

        assert metrics.is_charging is True
        assert metrics.temperature_celsius > 35  # Typical during charging

    @pytest.mark.asyncio
    async def test_battery_metrics_various_health_states(self):
        """Test metrics for different battery health conditions"""
        health_states = [
            {"health": 100.0, "cycles": 50, "condition": "excellent"},
            {"health": 90.0, "cycles": 200, "condition": "good"},
            {"health": 80.0, "cycles": 400, "condition": "fair"},
            {"health": 70.0, "cycles": 600, "condition": "poor"},
            {"health": 60.0, "cycles": 800, "condition": "degraded"},
        ]

        for state in health_states:
            metrics = BatteryMetrics(
                charge_percent=50.0,
                health_percent=state["health"],
                time_remaining_minutes=300,
                is_charging=False,
                cycle_count=state["cycles"],
                max_capacity_mah=5000.0,
                current_capacity_mah=2500.0,
                temperature_celsius=35.0,
                timestamp=datetime.now()
            )

            assert metrics.health_percent == state["health"]
            assert metrics.cycle_count == state["cycles"]

    @pytest.mark.asyncio
    async def test_battery_metrics_low_charge(self):
        """Test metrics parsing with low battery charge"""
        metrics = BatteryMetrics(
            charge_percent=5.0,
            health_percent=85.0,
            time_remaining_minutes=15,
            is_charging=False,
            cycle_count=500,
            max_capacity_mah=5000.0,
            current_capacity_mah=250.0,
            temperature_celsius=32.0,
            timestamp=datetime.now()
        )

        assert metrics.charge_percent < 10
        assert metrics.time_remaining_minutes < 30


class TestBatteryRecommendations:
    """Test 2: Recommendation generation for battery health issues"""

    def test_battery_recommendations_low_charge(self):
        """Test recommendations when battery is running low"""
        metrics = BatteryMetrics(
            charge_percent=20.0,
            health_percent=90.0,
            time_remaining_minutes=90,
            is_charging=False,
            cycle_count=300,
            max_capacity_mah=5000.0,
            current_capacity_mah=1000.0,
            temperature_celsius=35.0,
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 70,
                "category": "battery",
                "issue": "Low battery charge",
                "suggestion": "Plug in device to charge"
            }
        ]

        assert metrics.charge_percent <= 20
        assert any("charge" in r["issue"].lower() for r in recommendations)

    def test_battery_recommendations_degraded_health(self):
        """Test recommendations when battery health is degraded"""
        metrics = BatteryMetrics(
            charge_percent=65.0,
            health_percent=72.0,
            time_remaining_minutes=200,
            is_charging=False,
            cycle_count=600,
            max_capacity_mah=5000.0,
            current_capacity_mah=3250.0,
            temperature_celsius=38.0,
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 60,
                "category": "battery",
                "issue": "Battery health degraded",
                "suggestion": "Consider battery replacement soon"
            }
        ]

        assert metrics.health_percent < 80
        assert any("health" in r["issue"].lower() for r in recommendations)

    def test_battery_recommendations_high_temperature(self):
        """Test recommendations when battery is overheating"""
        metrics = BatteryMetrics(
            charge_percent=75.0,
            health_percent=85.0,
            time_remaining_minutes=300,
            is_charging=True,
            cycle_count=250,
            max_capacity_mah=5000.0,
            current_capacity_mah=3750.0,
            temperature_celsius=50.0,  # High temperature
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 65,
                "category": "battery",
                "issue": "Battery temperature high",
                "suggestion": "Unplug charger and allow battery to cool"
            }
        ]

        assert metrics.temperature_celsius > 45
        assert any("temperature" in r["issue"].lower() for r in recommendations)

    def test_battery_recommendations_normal_condition(self):
        """Test recommendations when battery is in good condition"""
        metrics = BatteryMetrics(
            charge_percent=85.0,
            health_percent=95.0,
            time_remaining_minutes=480,
            is_charging=False,
            cycle_count=100,
            max_capacity_mah=5000.0,
            current_capacity_mah=4250.0,
            temperature_celsius=33.0,
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 10,
                "category": "battery",
                "issue": "Battery condition good",
                "suggestion": "No action required"
            }
        ]

        assert metrics.health_percent > 90
        assert recommendations[0]["priority"] < 30


class TestBatterySubprocessTimeout:
    """Test 3: Subprocess timeout handling"""

    @pytest.mark.asyncio
    async def test_battery_analysis_timeout(self):
        """Test timeout handling for battery analysis"""
        with patch('asyncio.wait_for') as mock_wait:
            mock_wait.side_effect = asyncio.TimeoutError()

            with pytest.raises(asyncio.TimeoutError):
                await asyncio.wait_for(asyncio.sleep(10), timeout=0.1)

    @pytest.mark.asyncio
    async def test_battery_health_check_timeout(self):
        """Test timeout during battery health diagnostic"""
        async def battery_diagnostic():
            await asyncio.sleep(15)
            return {"health": 85.0}

        # Should timeout
        with pytest.raises(asyncio.TimeoutError):
            await asyncio.wait_for(battery_diagnostic(), timeout=1)

    @pytest.mark.asyncio
    async def test_battery_analysis_timeout_with_default_values(self):
        """Test fallback to default values on timeout"""
        call_count = 0

        async def mock_analysis():
            nonlocal call_count
            call_count += 1
            if call_count < 2:
                await asyncio.sleep(10)
            return {"status": "success", "health": 85.0}

        # First attempt times out, use default
        try:
            await asyncio.wait_for(mock_analysis(), timeout=0.1)
        except asyncio.TimeoutError:
            default_metrics = {"health": 85.0, "from_cache": True}
            assert default_metrics["from_cache"] is True

        # Second attempt succeeds
        result = await asyncio.wait_for(mock_analysis(), timeout=5)
        assert result["status"] == "success"

    @pytest.mark.asyncio
    async def test_battery_subprocess_error_handling(self):
        """Test error handling in battery subprocess"""
        with patch('subprocess.run') as mock_run:
            mock_run.side_effect = RuntimeError("Battery analysis unavailable")

            with pytest.raises(RuntimeError):
                raise mock_run.side_effect


class TestBatteryCriticalThresholds:
    """Test 4: Critical threshold detection"""

    def test_battery_critical_low_charge_detection(self):
        """Test detection of critically low battery (<15%)"""
        metrics = BatteryMetrics(
            charge_percent=10.0,
            health_percent=80.0,
            time_remaining_minutes=30,
            is_charging=False,
            cycle_count=400,
            max_capacity_mah=5000.0,
            current_capacity_mah=500.0,
            temperature_celsius=34.0,
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 100,
                "category": "battery",
                "issue": "Critical battery level",
                "severity": "critical"
            }
        ]

        assert metrics.charge_percent < 15
        assert recommendations[0]["severity"] == "critical"

    def test_battery_critical_health_detection(self):
        """Test detection of critically degraded health (<80%)"""
        metrics = BatteryMetrics(
            charge_percent=60.0,
            health_percent=75.0,
            time_remaining_minutes=200,
            is_charging=False,
            cycle_count=800,
            max_capacity_mah=5000.0,
            current_capacity_mah=3000.0,
            temperature_celsius=36.0,
            timestamp=datetime.now()
        )

        recommendations = [
            {
                "priority": 85,
                "category": "battery",
                "issue": "Critical battery degradation",
                "severity": "critical"
            }
        ]

        assert metrics.health_percent < 80
        assert recommendations[0]["severity"] == "critical"

    def test_battery_threshold_boundaries(self):
        """Test detection at various threshold boundaries"""
        test_cases = [
            {"charge": 99.0, "severity": "excellent"},
            {"charge": 80.0, "severity": "good"},
            {"charge": 50.0, "severity": "fair"},
            {"charge": 20.0, "severity": "low"},
            {"charge": 10.0, "severity": "critical"},
            {"charge": 5.0, "severity": "critical"},
        ]

        for test_case in test_cases:
            metrics = BatteryMetrics(
                charge_percent=test_case["charge"],
                health_percent=90.0,
                time_remaining_minutes=int(test_case["charge"] * 5),
                is_charging=False,
                cycle_count=300,
                max_capacity_mah=5000.0,
                current_capacity_mah=5000.0 * (test_case["charge"] / 100),
                temperature_celsius=35.0,
                timestamp=datetime.now()
            )

            assert metrics.charge_percent == test_case["charge"]

    def test_battery_combined_critical_indicators(self):
        """Test detection when multiple critical indicators present"""
        metrics = BatteryMetrics(
            charge_percent=12.0,
            health_percent=72.0,
            time_remaining_minutes=20,
            is_charging=False,
            cycle_count=950,
            max_capacity_mah=5000.0,
            current_capacity_mah=600.0,
            temperature_celsius=42.0,
            timestamp=datetime.now()
        )

        critical_indicators = {
            "low_charge": metrics.charge_percent < 15,
            "poor_health": metrics.health_percent < 80,
            "high_cycles": metrics.cycle_count > 800,
            "elevated_temp": metrics.temperature_celsius > 40
        }

        # Multiple critical indicators
        assert sum(critical_indicators.values()) >= 3

    def test_battery_overheating_critical_detection(self):
        """Test critical detection when battery is overheating"""
        metrics = BatteryMetrics(
            charge_percent=88.0,
            health_percent=82.0,
            time_remaining_minutes=350,
            is_charging=True,
            cycle_count=350,
            max_capacity_mah=5000.0,
            current_capacity_mah=4400.0,
            temperature_celsius=65.0,  # Dangerously high
            timestamp=datetime.now()
        )

        critical = (
            metrics.temperature_celsius > 55 and
            metrics.is_charging is True
        )

        assert critical is True

    def test_battery_aging_degradation_critical(self):
        """Test critical detection due to aging and degradation"""
        metrics = BatteryMetrics(
            charge_percent=50.0,
            health_percent=65.0,
            time_remaining_minutes=150,
            is_charging=False,
            cycle_count=1200,
            max_capacity_mah=5000.0,
            current_capacity_mah=3250.0,
            temperature_celsius=37.0,
            timestamp=datetime.now()
        )

        aging_critical = (
            metrics.cycle_count > 1000 and
            metrics.health_percent < 70
        )

        assert aging_critical is True

    def test_battery_imminent_failure_detection(self):
        """Test detection of battery in imminent failure state"""
        metrics = BatteryMetrics(
            charge_percent=8.0,
            health_percent=55.0,
            time_remaining_minutes=15,
            is_charging=False,
            cycle_count=1500,
            max_capacity_mah=5000.0,
            current_capacity_mah=400.0,
            temperature_celsius=45.0,
            timestamp=datetime.now()
        )

        imminent_failure = (
            metrics.charge_percent < 15 and
            metrics.health_percent < 60 and
            metrics.cycle_count > 1000 and
            metrics.temperature_celsius > 40
        )

        assert imminent_failure is True
