from abc import ABC, abstractmethod
from dataclasses import dataclass, field
from pathlib import Path
from typing import Any, Dict, List, Optional
from packaging import version
import re


@dataclass
class Issue:
    severity: str
    category: str
    message: str
    file: Path
    line: Optional[int] = None
    suggestion: Optional[str] = None
    rule_id: Optional[str] = None


@dataclass
class RuleResult:
    passed: bool
    message: str
    severity: str
    suggestion: Optional[str] = None


class Rule(ABC):
    @property
    @abstractmethod
    def rule_id(self) -> str:
        pass

    @property
    @abstractmethod
    def severity(self) -> str:
        pass

    @abstractmethod
    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        pass


class DeprecatedPackageRule(Rule):
    DEPRECATED_PACKAGES = {
        "request": "requests",
        "urllib2": "urllib.request",
        "httplib": "http.client",
        "StringIO": "io.StringIO",
    }

    @property
    def rule_id(self) -> str:
        return "deprecated-package"

    @property
    def severity(self) -> str:
        return "critical"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        deps = data.get("dependencies", {})
        dev_deps = data.get("devDependencies", {})

        all_deps = {**deps, **dev_deps}

        for pkg in all_deps:
            if pkg in self.DEPRECATED_PACKAGES:
                return RuleResult(
                    passed=False,
                    message=f"Deprecated package '{pkg}' found. Use '{self.DEPRECATED_PACKAGES[pkg]}' instead.",
                    severity=self.severity,
                    suggestion=f"Replace '{pkg}' with '{self.DEPRECATED_PACKAGES[pkg]}' in dependencies"
                )

        return RuleResult(passed=True, message="No deprecated packages found", severity="info")


class OutdatedVersionRule(Rule):
    @property
    def rule_id(self) -> str:
        return "outdated-version"

    @property
    def severity(self) -> str:
        return "warning"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        deps = data.get("dependencies", {})
        dev_deps = data.get("devDependencies", {})
        all_deps = {**deps, **dev_deps}

        outdated = []
        for pkg, ver in all_deps.items():
            if ver and ver.startswith("^"):
                try:
                    v = version.parse(ver[1:])
                    if v.major == 0:
                        outdated.append(f"{pkg}@{ver} (major version 0, may have breaking changes)")
                except Exception:
                    pass

        if outdated:
            return RuleResult(
                passed=False,
                message=f"Potentially outdated dependencies: {', '.join(outdated)}",
                severity=self.severity,
                suggestion="Review these dependencies for stability concerns"
            )

        return RuleResult(passed=True, message="Dependencies appear up to date", severity="info")


class MissingTypeCheckingRule(Rule):
    @property
    def rule_id(self) -> str:
        return "missing-type-checking"

    @property
    def severity(self) -> str:
        return "warning"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        if data.get("compilerOptions", {}).get("strict") is not True:
            return RuleResult(
                passed=False,
                message="TypeScript strict mode is not enabled",
                severity=self.severity,
                suggestion='Set "compilerOptions": { "strict": true } in tsconfig.json'
            )

        return RuleResult(passed=True, message="TypeScript strict mode is enabled", severity="info")


class SecurityVulnerabilityRule(Rule):
    VULNERABLE_PATTERNS = [
        (r"\"version\":\s*\"0\.\d+\.\d+\"", "Versions starting with 0.x may have security issues"),
        (r"\"private\":\s*false", "Package should not be public if marked private"),
    ]

    @property
    def rule_id(self) -> str:
        return "security-vulnerability"

    @property
    def severity(self) -> str:
        return "critical"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        import json
        content = json.dumps(data)

        for pattern, message in self.VULNERABLE_PATTERNS:
            if re.search(pattern, content):
                return RuleResult(
                    passed=False,
                    message=message,
                    severity=self.severity,
                    suggestion="Review and update the configuration"
                )

        return RuleResult(passed=True, message="No obvious security vulnerabilities detected", severity="info")


class MissingScriptsRule(Rule):
    @property
    def rule_id(self) -> str:
        return "missing-scripts"

    @property
    def severity(self) -> str:
        return "warning"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        scripts = data.get("scripts", {})

        required_scripts = ["test", "build"]
        missing = [s for s in required_scripts if s not in scripts]

        if missing:
            return RuleResult(
                passed=False,
                message=f"Missing recommended scripts: {', '.join(missing)}",
                severity=self.severity,
                suggestion=f"Add scripts for: {', '.join(missing)}"
            )

        return RuleResult(passed=True, message="Required scripts are present", severity="info")


class PythonProjectMetaRule(Rule):
    @property
    def rule_id(self) -> str:
        return "python-project-meta"

    @property
    def severity(self) -> str:
        return "info"

    def evaluate(self, data: Dict[str, Any], file_path: Path) -> RuleResult:
        issues = []

        if "tool" in data:
            if "poetry" in data.get("tool", {}):
                poetry = data["tool"]["poetry"]
                if not poetry.get("name"):
                    issues.append("Missing poetry project name")
                if not poetry.get("version"):
                    issues.append("Missing poetry project version")
            elif "pytest" in data.get("tool", {}):
                if not data["tool"]["pytest"].get("testpaths"):
                    issues.append("Missing pytest testpaths")

        if issues:
            return RuleResult(
                passed=False,
                message=f"Python project issues: {', '.join(issues)}",
                severity=self.severity,
                suggestion="Add missing project metadata"
            )

        return RuleResult(passed=True, message="Python project metadata is complete", severity="info")


class RuleRegistry:
    RULES = {
        "json": [
            DeprecatedPackageRule(),
            OutdatedVersionRule(),
            MissingTypeCheckingRule(),
            SecurityVulnerabilityRule(),
            MissingScriptsRule(),
        ],
        "yaml": [
            SecurityVulnerabilityRule(),
        ],
        "toml": [
            PythonProjectMetaRule(),
        ],
    }

    def __init__(self):
        self._rules = {k: list(v) for k, v in self.RULES.items()}

    def evaluate(self, format_type: str, data: Dict[str, Any], file_path: Path) -> List[Issue]:
        issues = []
        rules = self._rules.get(format_type, [])

        for rule in rules:
            result = rule.evaluate(data, file_path)
            if not result.passed:
                issues.append(Issue(
                    severity=result.severity,
                    category=rule.rule_id,
                    message=result.message,
                    file=file_path,
                    suggestion=result.suggestion,
                    rule_id=rule.rule_id
                ))

        return issues

    def add_rule(self, format_type: str, rule: Rule):
        if format_type not in self._rules:
            self._rules[format_type] = []
        self._rules[format_type].append(rule)