"""
Cppcheck报告解析器模块
"""
import re
import xml.etree.ElementTree as ET
from pathlib import Path
from typing import List

from .models import CppcheckIssue, IssueLocation


def parse_cppcheck_xml(xml_path: Path) -> List[CppcheckIssue]:
    """解析cppcheck XML报告"""
    tree = ET.parse(xml_path)
    root = tree.getroot()

    issues: List[CppcheckIssue] = []
    for error in root.findall("errors/error"):
        issue_id = error.get("id") or "unknown"
        severity = error.get("severity") or "unknown"
        msg = error.get("msg") or (error.get("verbose") or "")

        locations: List[IssueLocation] = []
        for loc in error.findall("location"):
            file_attr = loc.get("file")
            line_attr = loc.get("line")
            if not file_attr:
                continue
            file_path = Path(file_attr).expanduser().resolve()
            line = int(line_attr) if line_attr and line_attr.isdigit() else None
            locations.append(IssueLocation(file_path=file_path, line=line))

        if not locations:
            # 有些 error 只有一层 <error file= line=>
            file_attr = error.get("file")
            line_attr = error.get("line")
            if file_attr:
                locations.append(
                    IssueLocation(
                        file_path=Path(file_attr).expanduser().resolve(),
                        line=int(line_attr) if line_attr and str(line_attr).isdigit() else None,
                    )
                )

        issues.append(CppcheckIssue(id=issue_id, severity=severity, message=msg, locations=locations))

    return issues


def parse_cppcheck_text(text_path: Path) -> List[CppcheckIssue]:
    """解析 cppcheck 文本日志（常见行格式：
    /path/file.c:111:13: warning: Message [ruleId]
    也包含 note:/information:/error: 等等级
    """
    content = text_path.read_text(encoding="utf-8", errors="replace")
    issues: List[CppcheckIssue] = []

    # 常见匹配：路径:行:列: 等级: 消息 [规则]
    pattern = re.compile(r"^(?P<file>[^:\n]+?):(?P<line>\d+)(?::\d+)?\:\s*(?P<sev>warning|error|information|note)\:\s*(?P<msg>.*?)(?:\s*\[(?P<id>[^\]]+)\])?\s*$",
                         re.IGNORECASE)

    for raw_line in content.splitlines():
        m = pattern.match(raw_line.strip())
        if not m:
            continue
        file_path = Path(m.group("file")).expanduser()
        try:
            file_path = file_path.resolve()
        except Exception:
            pass
        line_num = int(m.group("line")) if m.group("line") else None
        sev = (m.group("sev") or "").lower()
        msg = m.group("msg") or ""
        rid = m.group("id") or "unknown"
        issues.append(
            CppcheckIssue(
                id=rid,
                severity=sev,
                message=msg,
                locations=[IssueLocation(file_path=file_path, line=line_num)],
            )
        )

    return issues


def read_code_snippet(file_path: Path, center_line: Optional[int], context: int = 30) -> str:
    """读取代码片段"""
    try:
        lines = file_path.read_text(encoding="utf-8", errors="replace").splitlines()
    except Exception:
        return ""

    if center_line is None:
        start = 0
        end = min(len(lines), 400)
    else:
        start = max(0, center_line - 1 - context)
        end = min(len(lines), center_line - 1 + context)
    snippet = "\n".join(lines[start:end])
    return snippet