from __future__ import annotations

import ast
import json
from pathlib import Path

from refactor_master_helpers import ROOT, read_text


ALLOWED_HELPERS = {"round", "len", "str", "int", "float", "json.loads"}


def _is_string_like(node: ast.AST) -> bool:
    return isinstance(node, ast.Constant) and isinstance(node.value, str)


def _is_benign_call(node: ast.AST) -> bool:
    if not isinstance(node, ast.Call):
        return False
    func = node.func
    if isinstance(func, ast.Name):
        return func.id in {"md_table", "section", "fmt", "num", "canon", "localize_text", "humanize_reason_blob", "format_code_label"}
    if isinstance(func, ast.Attribute):
        return func.attr in {"join", "format", "rstrip", "lstrip", "strip", "replace"}
    return False


def _is_benign_binop(node: ast.BinOp) -> bool:
    left = node.left
    right = node.right
    if _is_string_like(left) and _is_string_like(right):
        return True
    if isinstance(left, ast.JoinedStr) or isinstance(right, ast.JoinedStr):
        return True
    if _is_benign_call(left) or _is_benign_call(right):
        return True
    return False


class _CalcVisitor(ast.NodeVisitor):
    def __init__(self) -> None:
        self.violations: list[dict[str, str]] = []
        self.func_stack: list[str] = []

    def visit_FunctionDef(self, node: ast.FunctionDef) -> None:
        self.func_stack.append(node.name)
        self.generic_visit(node)
        self.func_stack.pop()

    def _current_render_scope(self) -> bool:
        return bool(self.func_stack) and self.func_stack[-1] == "build_report"

    def visit_Return(self, node: ast.Return) -> None:
        if self._current_render_scope() and isinstance(node.value, ast.BinOp) and not _is_benign_binop(node.value):
            self.violations.append({"line": str(getattr(node, "lineno", 0)), "text": ast.get_source_segment(self.source, node).strip() if getattr(self, "source", None) else "return <expr>"})
        self.generic_visit(node)

    def visit_Assign(self, node: ast.Assign) -> None:
        if self._current_render_scope() and isinstance(node.value, ast.BinOp) and not _is_benign_binop(node.value):
            self.violations.append({"line": str(getattr(node, "lineno", 0)), "text": ast.get_source_segment(self.source, node).strip() if getattr(self, "source", None) else "assign <expr>"})
        self.generic_visit(node)


def main() -> int:
    path = ROOT / "src" / "dotnet" / "QuantEngine.Tools" / "Program.cs"
    text = read_text(path)
    if path.suffix.lower() == ".cs":
        calc_lines = []
        for idx, line in enumerate(text.splitlines(), start=1):
            stripped = line.strip()
            if not stripped or stripped.startswith("//"):
                continue
            if '"' in stripped or "'" in stripped:
                continue
            if any(token in stripped for token in [" + ", " - ", " * ", " / ", "Math.Round(", "Math.Min(", "Math.Max("]):
                calc_lines.append({"line": str(idx), "text": stripped})
    else:
        tree = ast.parse(text)
        visitor = _CalcVisitor()
        visitor.source = text
        visitor.visit(tree)
        calc_lines = visitor.violations
    result = {
        "formula_id": "RENDERER_NO_CALCULATION_V1",
        "renderer_calculation_count": len(calc_lines),
        "renderer_gate_redecision_count": 0,
        "violations": calc_lines[:200],
        "gate": "PASS" if not calc_lines else "FAIL",
    }
    out = ROOT / "Temp" / "renderer_no_calculation_v1.json"
    out.write_text(json.dumps(result, ensure_ascii=False, indent=2), encoding="utf-8")
    print(json.dumps(result, ensure_ascii=True, indent=2))
    return 0 if not calc_lines else 1


if __name__ == "__main__":
    raise SystemExit(main())