"""
Tests for Stage 3 (Merge & Audit).

Validates:
- ir_final.json exists and is well-formed
- No duplicate rule_ids
- All rule_ids follow naming convention
- ir_audit_report.md exists and contains required sections
"""

import re
import sys
from pathlib import Path
from collections import Counter

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


PASS = "[PASS]"
FAIL = "[FAIL]"
WARN = "[WARN]"


def load_ir_final():
    """Load ir_final.json."""
    try:
        return config.load_json(config.IR_FINAL_JSON)
    except FileNotFoundError:
        print(f"{FAIL} ir_final.json 未找到: {config.IR_FINAL_JSON}")
        print("  请先运行 step3_merge_and_audit.py")
        sys.exit(1)


def load_audit_report():
    """Load ir_audit_report.md if it exists."""
    try:
        with open(config.IR_AUDIT_REPORT_MD, "r", encoding="utf-8") as f:
            return f.read()
    except FileNotFoundError:
        print(f"{FAIL} ir_audit_report.md 未找到: {config.IR_AUDIT_REPORT_MD}")
        print("  请先运行 step3_merge_and_audit.py")
        sys.exit(1)


def check_rule_ids(ir: dict) -> list[str]:
    """Check for duplicate rule_ids and naming convention."""
    errors = []
    rules = ir.get("rules", [])
    rule_ids = [r.get("rule_id", "") for r in rules]

    # No duplicates
    duplicates = [rid for rid, count in Counter(rule_ids).items() if count > 1]
    if duplicates:
        errors.append(f"重复 rule_id: {duplicates}")

    # Naming convention: FEATURE-TYPE-CAT-NN
    pattern = re.compile(r"^[A-Z]+-\d{3}-(SYS|UI|SDK)-FG-\d{2}$")
    for rid in rule_ids:
        if rid and not pattern.match(rid):
            errors.append(f"rule_id 命名不规范: '{rid}' (期望格式: DRL-001-SYS-FG-01)")

    return errors


def check_top_level_structure(ir: dict) -> list[str]:
    """Check that ir_final has the required top-level fields."""
    errors = []
    for field in ["feature", "feature_id", "rules"]:
        if field not in ir:
            errors.append(f"ir_final 缺少顶层字段: {field}")

    if not isinstance(ir.get("rules"), list):
        errors.append("ir_final.rules 必须是数组")
    elif len(ir["rules"]) == 0:
        errors.append("ir_final.rules 为空")

    return errors


def check_rule_completeness(rules: list[dict]) -> list[str]:
    """Check each rule has all required fields."""
    errors = []
    required_fields = ["rule_id", "description", "priority", "sources", "trigger", "actions"]
    for i, rule in enumerate(rules):
        rid = rule.get("rule_id", f"rule[{i}]")
        for field in required_fields:
            if field not in rule:
                errors.append(f"{rid}: 缺少字段 '{field}'")
        # sources must be non-empty
        if not rule.get("sources"):
            errors.append(f"{rid}: sources 为空")
        # actions must be non-empty
        if not rule.get("actions"):
            errors.append(f"{rid}: actions 为空")
    return errors


def check_audit_report(report: str) -> list[str]:
    """Check audit report has required sections."""
    errors = []

    required_sections = [
        "逻辑树节点覆盖率",
        "表格枚举覆盖",
        "开关状态",
    ]
    for section in required_sections:
        if section not in report:
            errors.append(f"审计报告缺少章节: {section}")

    # Should have at least one coverage percentage
    if "覆盖率" not in report and "%" not in report:
        errors.append("审计报告中未找到覆盖率统计")

    # Should have the human review notice
    if "人工审查" not in report:
        errors.append("审计报告缺少人工审查提示")

    return errors


def run_all_tests():
    print("=" * 60)
    print("Step 3 自检测试")
    print("=" * 60)

    ir = load_ir_final()
    report = load_audit_report()
    rules = ir.get("rules", [])
    all_errors = []

    # Test 1: Top-level structure
    errors = check_top_level_structure(ir)
    if errors:
        print(f"\n{FAIL} 顶层结构检查: {len(errors)} 个错误")
        for e in errors:
            print(f"  - {e}")
        all_errors.extend(errors)
    else:
        print(f"\n{PASS} 顶层结构检查: 通过 (feature={ir.get('feature')}, feature_id={ir.get('feature_id')})")

    # Test 2: rule_id uniqueness and naming
    errors = check_rule_ids(ir)
    if errors:
        print(f"\n{FAIL} rule_id 检查: {len(errors)} 个错误")
        for e in errors:
            print(f"  - {e}")
        all_errors.extend(errors)
    else:
        print(f"\n{PASS} rule_id 检查: 全部通过 ({len(rules)} 个唯一 ID)")

    # Test 3: Rule field completeness
    errors = check_rule_completeness(rules)
    if errors:
        print(f"\n{FAIL} 规则字段完整性: {len(errors)} 个错误")
        for e in errors:
            print(f"  - {e}")
        all_errors.extend(errors)
    else:
        print(f"\n{PASS} 规则字段完整性: 全部通过")

    # Test 4: Audit report content
    errors = check_audit_report(report)
    if errors:
        print(f"\n{FAIL} 审计报告检查: {len(errors)} 个错误")
        for e in errors:
            print(f"  - {e}")
        all_errors.extend(errors)
    else:
        print(f"\n{PASS} 审计报告检查: 全部通过")

    # Summary
    print(f"\n{'='*60}")
    total_failures = len(all_errors)

    if total_failures == 0:
        print(f"{PASS} 所有测试通过!")
        print(f"\n最终交付物:")
        print(f"  - {config.IR_FINAL_JSON} ({len(rules)} 条规则)")
        print(f"  - {config.IR_AUDIT_REPORT_MD}")
    else:
        print(f"{FAIL} 测试失败: {total_failures} 个错误")
        print("\n建议: 检查 ir_fragments.json 和合并逻辑，修复问题后重新运行 step3_merge_and_audit.py")

    return total_failures == 0


if __name__ == "__main__":
    success = run_all_tests()
    sys.exit(0 if success else 1)