#!/usr/bin/env python3
"""Заменить дублирующий <summary> реализации на <inheritdoc/> (код-стайл Дейла).

Консервативно:
  * собираются тексты <summary> членов интерфейсов (блоки, состоящие только из <summary>);
  * в типах с интерфейсной базой такой же по тексту блок-док заменяется на `/// <inheritdoc />`;
  * блоки с <param>/<returns>/<remarks>/... и summary самих типов не трогаются.

Запуск: python scripts/dedup_summary_inheritdoc.py [--apply]
Без --apply — dry-run со счётчиками.
"""
from __future__ import annotations

import re
import sys
from pathlib import Path

REPO = Path(__file__).resolve().parent.parent
ROOTS = [
    REPO / "src" / "core",
    REPO / "src" / "telegram-service",
    REPO / "src" / "ai-service",
    REPO / "src" / "ml-service",
    REPO / "src" / "storage-service",
    REPO / "src" / "grpc-hosting",
]

INTERFACE_RE = re.compile(
    r"^\s*(?:public|internal|protected|private)?\s*"
    r"(?:static\s+|sealed\s+|abstract\s+|partial\s+|unsafe\s+)*interface\s+\w+"
)
TYPE_BASE_RE = re.compile(
    r"^\s*(?:public|internal|protected|private)?\s*"
    r"(?:static\s+|sealed\s+|abstract\s+|partial\s+|unsafe\s+)*"
    r"(?:class|struct|record)\s+\w+[^{;]*:\s*(.+?)(?:\{|$)"
)
IFACE_NAME_RE = re.compile(r"\bI[A-Z]\w*")
EXTRA_TAG_RE = re.compile(r"<(?:param|typeparam|returns|remarks|exception|example|value)\b", re.IGNORECASE)
SUMMARY_OPEN_RE = re.compile(r"<summary>", re.IGNORECASE)
SUMMARY_CLOSE_RE = re.compile(r"</summary>", re.IGNORECASE)


def iter_files() -> list[Path]:
    files: list[Path] = []
    for root in ROOTS:
        if not root.exists():
            continue
        for path in root.rglob("*.cs"):
            parts = set(path.parts)
            if "obj" in parts or "bin" in parts:
                continue
            if "tests" in path.as_posix().lower():
                continue
            files.append(path)
    return sorted(files)


def normalize(block: list[str]) -> str:
    text = " ".join(line.strip().lstrip("/").strip() for line in block)
    text = SUMMARY_CLOSE_RE.sub("", SUMMARY_OPEN_RE.sub("", text))
    return re.sub(r"\s+", " ", text).strip()


def is_summary_only(block: list[str]) -> bool:
    joined = "\n".join(block)
    return (
        bool(SUMMARY_OPEN_RE.search(joined))
        and bool(SUMMARY_CLOSE_RE.search(joined))
        and not EXTRA_TAG_RE.search(joined)
    )


def depth_snapshot(lines: list[str]) -> list[int]:
    """Глубина фигурных скобок перед каждой строкой (приблизительно, без строк/комментариев)."""
    depths: list[int] = []
    depth = 0
    for line in lines:
        depths.append(depth)
        depth += line.count("{") - line.count("}")
    return depths


def type_scopes(lines: list[str]):
    """Список (start_line, end_line, kind) для интерфейсов и типов с интерфейсной базой.

    kind: "interface" | "type". Границы — по фигурным скобкам объявления.
    """
    depths = depth_snapshot(lines)
    scopes: list[tuple[int, int, str]] = []
    stack: list[tuple[int, str, int]] = []  # (depth, kind, start_line)
    for idx, line in enumerate(lines):
        depth_before = depths[idx]
        if INTERFACE_RE.match(line):
            stack.append((depth_before, "interface", idx))
        else:
            m = TYPE_BASE_RE.match(line)
            if m and IFACE_NAME_RE.search(m.group(1)):
                stack.append((depth_before, "type", idx))
        # закрыть блоки на строке закрывающей скобки (глубина после неё возвращается к уровню объявления)
        while (
            stack
            and depths[idx] <= stack[-1][0]
            and lines[idx].strip().startswith("}")
            and idx > stack[-1][2]
        ):
            depth, kind, start = stack.pop()
            scopes.append((start, idx, kind))
    for depth, kind, start in stack:
        scopes.append((start, len(lines) - 1, kind))
    return scopes


def containing_kinds(scope_kinds: list[tuple[int, int, str]], line_idx: int, depth: int) -> set[str]:
    kinds: set[str] = set()
    for start, end, kind in scope_kinds:
        if start <= line_idx <= end and start != line_idx:
            kinds.add(kind)
    return kinds


def collect_interface_summaries(files: list[Path]) -> set[str]:
    summaries: set[str] = set()
    for path in files:
        lines = path.read_text(encoding="utf-8").splitlines()
        depths = depth_snapshot(lines)
        scopes = type_scopes(lines)
        idx = 0
        while idx < len(lines):
            if not lines[idx].lstrip().startswith("///"):
                idx += 1
                continue
            start = idx
            while idx < len(lines) and lines[idx].lstrip().startswith("///"):
                idx += 1
            block = lines[start:idx]
            kinds = containing_kinds(scopes, start, depths[start])
            if "interface" in kinds and is_summary_only(block):
                summaries.add(normalize(block))
    return summaries


def process_file(path: Path, iface_summaries: set[str]) -> tuple[int, list[str]]:
    lines = path.read_text(encoding="utf-8").splitlines()
    depths = depth_snapshot(lines)
    scopes = type_scopes(lines)
    result: list[str] = []
    replaced = 0
    idx = 0
    while idx < len(lines):
        if not lines[idx].lstrip().startswith("///"):
            result.append(lines[idx])
            idx += 1
            continue
        start = idx
        while idx < len(lines) and lines[idx].lstrip().startswith("///"):
            idx += 1
        block = lines[start:idx]
        kinds = containing_kinds(scopes, start, depths[start])
        if "type" in kinds and is_summary_only(block) and normalize(block) in iface_summaries:
            indent = block[0][: len(block[0]) - len(block[0].lstrip())]
            result.append(f"{indent}/// <inheritdoc />")
            replaced += 1
        else:
            result.extend(block)
    return replaced, result


def main() -> int:
    apply = "--apply" in sys.argv
    files = iter_files()
    iface_summaries = collect_interface_summaries(files)
    total = 0
    changed = 0
    for path in files:
        replaced, new_lines = process_file(path, iface_summaries)
        if not replaced:
            continue
        total += replaced
        changed += 1
        if apply:
            original = path.read_text(encoding="utf-8")
            text = "\n".join(new_lines) + ("\n" if original.endswith("\n") else "")
            path.write_text(text, encoding="utf-8")
    mode = "применено" if apply else "dry-run"
    print(f"{mode}: замен {total} в {changed} файлах (интерфейсных summary: {len(iface_summaries)})")
    return 0


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