"""Old-world archive (Section 10).

``worlds/`` retains every generated world; ``worlds/index.json`` is the
append-only index. Summaries feed the author as divergence context so new
worlds don't reuse premises/settings/twists.
"""

from __future__ import annotations

import json
from pathlib import Path
from typing import Any


class Archive:
    def __init__(self, worlds_dir: Path) -> None:
        self.worlds_dir = worlds_dir
        self.index_path = worlds_dir / "index.json"
        self.worlds_dir.mkdir(parents=True, exist_ok=True)

    def entries(self) -> list[dict[str, Any]]:
        if not self.index_path.exists():
            return []
        data: list[dict[str, Any]] = json.loads(self.index_path.read_text("utf-8"))
        return data

    def append(self, entry: dict[str, Any]) -> None:
        entries = self.entries()
        entries.append(entry)
        self.index_path.write_text(json.dumps(entries, indent=2), "utf-8")

    def bump_play_count(self, world_id: str) -> None:
        entries = self.entries()
        for e in entries:
            if e.get("world_id") == world_id:
                e["play_count"] = int(e.get("play_count", 0)) + 1
        self.index_path.write_text(json.dumps(entries, indent=2), "utf-8")

    def divergence_summaries(self) -> list[dict[str, str]]:
        return [
            {
                "one_line": e.get("one_line", ""),
                "setting": e.get("setting", ""),
                "twist_tag": e.get("twist_tag", ""),
            }
            for e in self.entries()
        ]