"""覆盖率比较 — 静态覆盖率 vs 动态覆盖率差异分析。"""

from __future__ import annotations

from typing import Any


def compare_coverage(
    program_name: str,
    static: dict[str, Any],
    dynamic: dict[str, Any],
) -> dict[str, Any]:
    """比较静态覆盖率和动态覆盖率之间的差异。

    静态覆盖率: 基于源码结构分析的理论覆盖范围。
    动态覆盖率: 基于 gcov 实际执行数据的覆盖范围。

    Args:
        program_name: 程序名称
        static: 静态覆盖率数据
            {"branch_rate": float, "paragraph_rate": float,
             "total_branches": int, "covered_branches": int, ...}
        dynamic: 动态覆盖率数据
            {"gcov_cov": float, "covered_branches": int,
             "total_branches": int, "misleading_branches": list, ...}

    Returns:
        dict: {
            "program": str,             # 程序名称
            "static": {"branch_rate": float, "paragraph_rate": float},
            "dynamic": {"gcov_cov": float},
            "gap": float,               # static - dynamic 的差异
            "misleading_branches": list,  # 可能导致误导的分支列表
        }
    """
    static_branch_rate = static.get("branch_rate", 0.0)
    static_para_rate = static.get("paragraph_rate", 0.0)
    dynamic_cov = dynamic.get("gcov_cov", 0.0)

    # 静态综合覆盖率
    static_combined = static_branch_rate * 0.5 + static_para_rate * 0.5

    # 差距: 静态覆盖率 - 动态覆盖率
    gap = round(static_combined - dynamic_cov, 4)

    # 误导性分支: 静态认为已覆盖但动态未覆盖的分支
    misleading_branches = dynamic.get("misleading_branches", [])

    return {
        "program": program_name,
        "static": {
            "branch_rate": static_branch_rate,
            "paragraph_rate": static_para_rate,
        },
        "dynamic": {
            "gcov_cov": dynamic_cov,
        },
        "gap": gap,
        "misleading_branches": misleading_branches,
    }