#!/usr/bin/env python3
"""
Tests for update_checker.py — 5.3: Update Checker

Acceptance criteria verified:
  ✓ Compares installed vs latest
  ✓ Reports major/minor/patch updates  
  ✓ Flags breaking changes (major)
  ✓ Output: update report
"""

import json
import os
import subprocess
import sys
import tempfile
from datetime import datetime
from pathlib import Path
from unittest.mock import patch, MagicMock

# Add scripts dir to path
sys.path.insert(0, os.path.join(os.path.dirname(__file__), "..", "scripts"))

import update_checker as uc


def test_parse_version():
    assert uc.parse_version("1.2.3") == (1, 2, 3)
    assert uc.parse_version("2.0.0") == (2, 0, 0)
    assert uc.parse_version("0.9.0") == (0, 9, 0)
    assert uc.parse_version("1.2") == (1, 2, 0)
    assert uc.parse_version("1") == (1, 0, 0)
    assert uc.parse_version("invalid") == (0, 0, 0)
    print("PASS: parse_version")


def test_classify_update_patch():
    result = uc.classify_update("1.2.3", "1.2.4")
    assert result is not None
    assert result['update_type'] == 'patch'
    assert result['breaking_change'] is False
    assert result['severity'] == 'low'
    print("PASS: classify_update_patch")


def test_classify_update_minor():
    result = uc.classify_update("1.2.3", "1.3.0")
    assert result is not None
    assert result['update_type'] == 'minor'
    assert result['breaking_change'] is False
    assert result['severity'] == 'medium'
    print("PASS: classify_update_minor")


def test_classify_update_major():
    result = uc.classify_update("1.2.3", "2.0.0")
    assert result is not None
    assert result['update_type'] == 'major'
    assert result['breaking_change'] is True
    assert result['severity'] == 'high'
    print("PASS: classify_update_major")


def test_classify_update_no_change():
    result = uc.classify_update("1.2.3", "1.2.3")
    assert result is None
    print("PASS: classify_update_no_change")


def test_classify_update_multiple_major():
    result = uc.classify_update("1.0.0", "3.0.0")
    assert result is not None
    assert result['update_type'] == 'major'
    assert result['breaking_change'] is True
    print("PASS: classify_update_multiple_major")


def test_text_report_format():
    updates = [{
        'package': 'requests',
        'installed': '2.28.0',
        'latest': '2.31.0',
        'update_type': 'minor',
        'breaking_change': False,
        'severity': 'medium',
    }]
    report = uc.generate_text_report(updates)
    assert 'DEPENDENCY UPDATE REPORT' in report
    assert 'requests' in report
    assert '2.28.0' in report
    assert '2.31.0' in report
    assert 'MINOR' in report
    assert 'MEDIUM' in report
    print("PASS: text_report_format")


def test_text_report_shows_breaking():
    updates = [{
        'package': 'flask',
        'installed': '2.0.0',
        'latest': '3.0.0',
        'update_type': 'major',
        'breaking_change': True,
        'severity': 'high',
    }]
    report = uc.generate_text_report(updates)
    assert 'BREAKING CHANGE' in report.upper() or '⚠' in report
    print("PASS: text_report_shows_breaking")


def test_json_report_structure():
    updates = [
        {
            'package': 'pytest',
            'installed': '8.0.0',
            'latest': '8.2.0',
            'update_type': 'minor',
            'breaking_change': False,
            'severity': 'medium',
        },
        {
            'package': 'flask',
            'installed': '2.0.0',
            'latest': '3.0.0',
            'update_type': 'major',
            'breaking_change': True,
            'severity': 'high',
        }
    ]
    report_json = uc.generate_json_report(updates)
    data = json.loads(report_json)
    assert 'generated_at' in data
    assert data['total_updates'] == 2
    assert 'summary' in data
    assert data['summary']['major'] == 1
    assert data['summary']['minor'] == 1
    assert data['summary']['breaking'] == 1
    print("PASS: json_report_structure")


def test_no_updates_report():
    report = uc.generate_text_report([])
    assert 'up to date' in report.lower() or 'all packages' in report.lower()
    print("PASS: no_updates_report")


def test_end_to_end_integration():
    """End-to-end: check_updates with mocked data produces valid report."""
    fake_installed = {
        "test-pkg-old": "1.0.0",
        "another-pkg": "2.5.3",
    }
    
    def fake_get_latest(pkg):
        if pkg == "test-pkg-old":
            return "1.2.4"
        elif pkg == "another-pkg":
            return "3.0.0"
        return None
    
    with patch('update_checker.get_installed_packages', return_value=fake_installed):
        with patch('update_checker.get_latest_version', side_effect=fake_get_latest):
            updates = uc.check_updates()
    
    assert len(updates) == 2
    
    test_pkg = next(u for u in updates if u['package'] == 'test-pkg-old')
    assert test_pkg['update_type'] == 'minor'
    assert test_pkg['breaking_change'] is False
    
    another = next(u for u in updates if u['package'] == 'another-pkg')
    assert another['update_type'] == 'major'
    assert another['breaking_change'] is True
    
    report = uc.generate_text_report(updates)
    assert 'DEPENDENCY UPDATE REPORT' in report
    assert 'MINOR' in report
    assert 'BREAKING CHANGE' in report.upper()
    
    print(f"PASS: end_to_end_integration ({len(updates)} updates)")


if __name__ == "__main__":
    passed = 0
    failed = 0
    tests = [
        test_parse_version,
        test_classify_update_patch,
        test_classify_update_minor,
        test_classify_update_major,
        test_classify_update_no_change,
        test_classify_update_multiple_major,
        test_text_report_format,
        test_text_report_shows_breaking,
        test_json_report_structure,
        test_no_updates_report,
        test_end_to_end_integration,
    ]
    for test_func in tests:
        try:
            test_func()
            passed += 1
        except AssertionError as e:
            print(f"FAIL: {test_func.__name__} — {e}")
            failed += 1
        except Exception as e:
            print(f"ERROR: {test_func.__name__} — {e}")
            import traceback
            traceback.print_exc()
            failed += 1
    print(f"\n{passed} passed, {failed} failed")
    sys.exit(0 if failed == 0 else 1)