import pytest
import subprocess
import os
import json
import tempfile
import time
import signal
import threading


SCRIPT_PATH = os.path.join(os.path.dirname(os.path.dirname(__file__)), "scripts", "logwhisperer.sh")


@pytest.fixture
def temp_log_file():
    """Create a temporary log file for testing."""
    with tempfile.NamedTemporaryFile(mode="w", suffix=".log", delete=False) as f:
        f.write("Apr  2 10:00:00 server kernel: Normal log line\n")
        f.flush()
        yield f.name
    os.unlink(f.name)


@pytest.fixture
def temp_config():
    """Create a temporary config file for testing."""
    with tempfile.NamedTemporaryFile(mode="w", suffix=".env", delete=False) as f:
        f.write('WEBHOOK_URL="http://localhost:9999/webhook"\n')
        f.write('CLIENT_ID="test-client-uuid"\n')
        f.write('LOG_SOURCES="/tmp/test.log"\n')
        f.write("POLL_INTERVAL=1\n")
        f.write("MAX_LINE_LENGTH=2000\n")
        f.flush()
        yield f.name
    os.unlink(f.name)


class TestScriptExistence:
    """Test that the script exists and is executable."""

    def test_script_exists(self):
        assert os.path.exists(SCRIPT_PATH), f"Script not found at {SCRIPT_PATH}"

    def test_script_is_executable(self):
        assert os.access(SCRIPT_PATH, os.X_OK), f"Script is not executable: {SCRIPT_PATH}"

    def test_script_has_shebang(self):
        with open(SCRIPT_PATH, "r") as f:
            first_line = f.readline().strip()
        assert first_line.startswith("#!/bin/bash"), f"Missing bash shebang, got: {first_line}"


class TestScriptValidation:
    """Test script validation and help output."""

    def test_script_help_flag(self):
        result = subprocess.run(
            [SCRIPT_PATH, "--help"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0
        assert "usage" in result.stdout.lower() or "help" in result.stdout.lower()

    def test_script_validate_config(self):
        """Test --validate flag with a good config."""
        with tempfile.NamedTemporaryFile(mode="w", suffix=".env", delete=False) as f:
            f.write('WEBHOOK_URL="http://localhost:9999/webhook"\n')
            f.write('CLIENT_ID="test-uuid"\n')
            f.write('LOG_SOURCES="/var/log/syslog"\n')
            f.write("POLL_INTERVAL=5\n")
            config_path = f.name

        try:
            result = subprocess.run(
                [SCRIPT_PATH, "--validate", "--config", config_path],
                capture_output=True,
                text=True,
                timeout=10,
            )
            assert result.returncode == 0
        finally:
            os.unlink(config_path)

    def test_script_validate_missing_config(self):
        """Test --validate flag with missing config."""
        result = subprocess.run(
            [SCRIPT_PATH, "--validate", "--config", "/nonexistent/config.env"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode != 0


class TestPatternMatching:
    """Test that the script correctly matches error patterns."""

    def test_detects_fatal_pattern(self, temp_log_file, temp_config):
        """Test detection of FATAL pattern."""
        with open(temp_config, "w") as f:
            f.write(f'WEBHOOK_URL="http://localhost:9999/webhook"\n')
            f.write('CLIENT_ID="test-client-uuid"\n')
            f.write(f'LOG_SOURCES="{temp_log_file}"\n')
            f.write("POLL_INTERVAL=1\n")
            f.write("MAX_LINE_LENGTH=2000\n")

        with open(temp_log_file, "a") as f:
            f.write("Apr  2 10:30:00 server postgres[1234]: FATAL: too many connections\n")
            f.flush()

        result = subprocess.run(
            [SCRIPT_PATH, "--dry-run", "--config", temp_config, "--test-line", "FATAL: too many connections"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0
        assert "matched" in result.stdout.lower() or "FATAL" in result.stdout

    def test_detects_oom_pattern(self):
        """Test detection of OOM pattern."""
        result = subprocess.run(
            [SCRIPT_PATH, "--dry-run", "--test-line", "kernel: Out of memory: Kill process 1234"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0
        assert "OOM" in result.stdout or "matched" in result.stdout.lower()

    def test_detects_error_pattern(self):
        """Test detection of ERROR pattern."""
        result = subprocess.run(
            [SCRIPT_PATH, "--dry-run", "--test-line", "nginx: ERROR: connection refused"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0

    def test_ignores_normal_lines(self):
        """Test that normal log lines are not matched."""
        result = subprocess.run(
            [SCRIPT_PATH, "--dry-run", "--test-line", "Apr  2 10:00:00 server sshd[5678]: Accepted publickey"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0
        assert "no match" in result.stdout.lower() or "skip" in result.stdout.lower()


class TestPayloadFormat:
    """Test that the script generates correct JSON payload."""

    def test_json_payload_structure(self):
        """Test that dry-run outputs valid JSON with required fields."""
        result = subprocess.run(
            [
                SCRIPT_PATH,
                "--dry-run",
                "--test-line",
                "kernel: Out of memory: Kill process 1234",
                "--test-source",
                "/var/log/syslog",
            ],
            capture_output=True,
            text=True,
            timeout=10,
        )
        assert result.returncode == 0

        output = result.stdout.strip()
        try:
            payload = json.loads(output)
        except json.JSONDecodeError:
            pytest.fail(f"Output is not valid JSON: {output}")

        required_fields = ["client_id", "hostname", "source", "severity", "timestamp", "raw_log", "matched_pattern"]
        for field in required_fields:
            assert field in payload, f"Missing required field: {field}"

    def test_severity_mapping(self):
        """Test that severity is correctly mapped based on pattern."""
        result = subprocess.run(
            [SCRIPT_PATH, "--dry-run", "--test-line", "kernel: Out of memory: Kill process"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        payload = json.loads(result.stdout.strip())
        assert payload["severity"] in ["low", "medium", "critical"]