#!/usr/bin/env python3
"""
Detekt Parser - Kotlin static code analysis integration.

Detekt is a static code analysis tool for Kotlin that finds code smells,
complexity issues, and potential bugs. This parser integrates with Detekt
for comprehensive Kotlin code quality analysis.

Detekt provides:
- Code smell detection (complexity, style, potential bugs)
- Customizable rule sets
- Baseline support for legacy code
- Multiple output formats (XML, HTML, SARIF, plain text)
"""

import shutil
from dataclasses import dataclass, field
from enum import Enum
from pathlib import Path
from typing import Any


class DetektSeverity(Enum):
    """Detekt finding severity levels."""

    ERROR = "error"
    WARNING = "warning"
    INFO = "info"
    STYLE = "style"


class DetektRuleSet(Enum):
    """Detekt rule set categories."""

    COMPLEXITY = "complexity"
    COROUTINES = "coroutines"
    EMPTY_BLOCKS = "empty-blocks"
    EXCEPTIONS = "exceptions"
    NAMING = "naming"
    PERFORMANCE = "performance"
    POTENTIAL_BUGS = "potential-bugs"
    STYLE = "style"
    COMMENTS = "comments"
    FORMATTING = "formatting"


@dataclass
class DetektFinding:
    """Represents a single Detekt finding."""

    rule_id: str
    rule_set: str
    message: str
    severity: DetektSeverity
    file_path: str
    line: int
    column: int
    end_line: int | None = None
    end_column: int | None = None
    snippet: str | None = None
    documentation_url: str | None = None

    @property
    def location(self) -> str:
        """Get formatted location string."""
        return f"{self.file_path}:{self.line}:{self.column}"

    @property
    def is_error(self) -> bool:
        """Check if finding is an error."""
        return self.severity == DetektSeverity.ERROR


@dataclass
class DetektConfig:
    """Detekt configuration representation."""

    # Build configuration
    build_upon_default_config: bool = True
    parallel: bool = True
    fail_fast: bool = False

    # Thresholds
    max_issues: int = 0
    exclude_correctable: bool = False

    # Rule sets enabled
    rule_sets: dict[str, bool] = field(default_factory=dict)

    # Rule overrides
    rules: dict[str, dict[str, Any]] = field(default_factory=dict)

    # Exclude patterns
    excludes: list[str] = field(default_factory=list)
    includes: list[str] = field(default_factory=list)


@dataclass
class DetektReport:
    """Complete Detekt analysis report."""

    findings: list[DetektFinding] = field(default_factory=list)
    config: DetektConfig | None = None
    execution_time_ms: float | None = None
    kotlin_version: str | None = None
    detekt_version: str | None = None

    @property
    def error_count(self) -> int:
        """Count of error-level findings."""
        return sum(1 for f in self.findings if f.severity == DetektSeverity.ERROR)

    @property
    def warning_count(self) -> int:
        """Count of warning-level findings."""
        return sum(1 for f in self.findings if f.severity == DetektSeverity.WARNING)

    @property
    def total_count(self) -> int:
        """Total finding count."""
        return len(self.findings)

    def by_rule_set(self) -> dict[str, list[DetektFinding]]:
        """Group findings by rule set."""
        result: dict[str, list[DetektFinding]] = {}
        for finding in self.findings:
            if finding.rule_set not in result:
                result[finding.rule_set] = []
            result[finding.rule_set].append(finding)
        return result

    def by_file(self) -> dict[str, list[DetektFinding]]:
        """Group findings by file."""
        result: dict[str, list[DetektFinding]] = {}
        for finding in self.findings:
            if finding.file_path not in result:
                result[finding.file_path] = []
            result[finding.file_path].append(finding)
        return result


class DetektParser:
    """
    Parser for Detekt static analysis output.

    Detekt is a static code analysis tool for Kotlin. This parser can:
    - Parse Detekt XML/SARIF/text output
    - Execute Detekt via CLI
    - Parse detekt.yml configuration
    - Generate baseline files

    Example usage:
        parser = DetektParser()

        # Parse existing report
        report = parser.parse_xml_report('build/reports/detekt/detekt.xml')

        # Run Detekt on a project
        report = parser.analyze_project('/path/to/kotlin/project')

        # Get findings by severity
        errors = [f for f in report.findings if f.is_error]

    """

    def __init__(self, detekt_path: str | None = None):
        """
        Initialize Detekt parser.

        :param detekt_path: Path to Detekt CLI jar or script.
        """
        self._detekt_path = detekt_path or self._find_detekt()

    def _find_detekt(self) -> str | None:
        """Find Detekt executable."""
        # Check for detekt CLI in PATH
        detekt = shutil.which("detekt")
        if detekt:
            return detekt

        # Check for Gradle wrapper
        if Path("gradlew").exists():
            return "./gradlew"

        return None

    def parse_xml_report(self, xml_path: str) -> DetektReport:
        """
        Parse Detekt XML report.

        :param xml_path: Path to Detekt XML report file.
        :return: DetektReport with findings.

        """
        raise NotImplementedError("XML report parsing not yet implemented")

    def parse_sarif_report(self, sarif_path: str) -> DetektReport:
        """
        Parse Detekt SARIF report.

        :param sarif_path: Path to Detekt SARIF report file.
        :return: DetektReport with findings.

        """
        raise NotImplementedError("SARIF report parsing not yet implemented")

    def parse_text_report(self, text: str) -> DetektReport:
        """
        Parse Detekt plain text output.

        :param text: Detekt plain text output.
        :return: DetektReport with findings.

        """
        raise NotImplementedError("Text report parsing not yet implemented")

    def parse_config(self, config_path: str = "detekt.yml") -> DetektConfig:
        """
        Parse Detekt configuration file.

        :param config_path: Path to detekt.yml.
        :return: DetektConfig object.

        """
        raise NotImplementedError("Config parsing not yet implemented")

    def analyze_project(
        self,
        project_path: str,
        config_path: str | None = None,
    ) -> DetektReport:
        """
        Run Detekt on a Kotlin project.

        :param project_path: Path to Kotlin project.
        :param config_path: Optional path to detekt.yml.
        :return: DetektReport with findings.

        """
        raise NotImplementedError("Project analysis not yet implemented")

    def analyze_file(self, file_path: str) -> DetektReport:
        """
        Run Detekt on a single file.

        :param file_path: Path to Kotlin file.
        :return: DetektReport with findings.

        """
        raise NotImplementedError("File analysis not yet implemented")

    def generate_baseline(
        self,
        project_path: str,
        output_path: str = "detekt-baseline.xml",
    ) -> str:
        """
        Generate a baseline file for existing issues.

        :param project_path: Path to Kotlin project.
        :param output_path: Output path for baseline file.
        :return: Path to generated baseline file.

        """
        raise NotImplementedError("Baseline generation not yet implemented")
