"""Parse FILE_MAPPING.md into file_context.json.

FILE_MAPPING.md (teammate-generated) has one "### N. filename" section per
source file with bullet fields. We extract per file: content label, inferred
role, and detailed summary, keyed by the file's path inside the JSON pack
(e.g. "Initial/Gameplay/Adam_s Phone/Messages/General.json").

Usage:
    python -m pipeline.build_file_context
"""

import json
import re
import sys
from pathlib import Path

sys.path.insert(0, str(Path(__file__).parent.parent))
import config

_SECTION_RE = re.compile(r"^### \d+\. `", re.MULTILINE)
_FIELD_RES = {
    "rel_path": re.compile(r"^- Relative path: `(.+?)`", re.MULTILINE),
    "label": re.compile(r"^- Content label: `(.+?)`", re.MULTILINE),
    "role": re.compile(r"^- Inferred role: (.+?)$", re.MULTILINE),
    "summary": re.compile(r"^- Detailed summary: (.+?)$", re.MULTILINE),
}


def normalize_key(rel_path: str) -> str:
    """Canonical lookup key: strip stray spaces around each path component."""
    return "/".join(part.strip() for part in rel_path.replace("\\", "/").split("/"))


def _pack_key(rel_path: str) -> str:
    """'English/Initial/.../General.docx' -> 'Initial/.../General.json'."""
    path = rel_path.replace("\\", "/").removeprefix("English/")
    return normalize_key(str(Path(path).with_suffix(".json")))


def parse_file_mapping(markdown: str) -> dict[str, dict[str, str]]:
    context: dict[str, dict[str, str]] = {}
    for section in _SECTION_RE.split(markdown)[1:]:
        fields = {}
        for name, pattern in _FIELD_RES.items():
            match = pattern.search(section)
            fields[name] = match.group(1).strip() if match else ""
        if not fields["rel_path"]:
            continue
        context[_pack_key(fields["rel_path"])] = {
            "label": fields["label"],
            "role": fields["role"],
            "summary": fields["summary"],
        }
    return context


def main() -> None:
    markdown = config.FILE_MAPPING_PATH.read_text(encoding="utf-8")
    context = parse_file_mapping(markdown)
    config.FILE_CONTEXT_PATH.write_text(
        json.dumps(context, indent=2, ensure_ascii=False), encoding="utf-8"
    )
    print(f"Wrote context for {len(context)} files to {config.FILE_CONTEXT_PATH.name}")


if __name__ == "__main__":
    main()