"""store_helpers.py — shared helpers for scripts using the capnp store.

All memory content lives in the capnp store (poc-memory). These helpers
replace the old pattern of globbing ~/.claude/memory/*.md and parsing
section headers directly.
"""

import re
import subprocess
from functools import lru_cache


def _run_poc(args: list[str], timeout: int = 30) -> str:
    """Run a poc-memory command and return stdout."""
    try:
        result = subprocess.run(
            ["poc-memory"] + args,
            capture_output=True, text=True, timeout=timeout
        )
        return result.stdout.strip()
    except Exception:
        return ""


def list_keys() -> list[str]:
    """Get all memory node keys from the store."""
    output = _run_poc(["list-keys"])
    return [k.strip() for k in output.split('\n') if k.strip()]


def get_semantic_keys() -> list[str]:
    """Get semantic memory keys (excludes journal, system files)."""
    keys = list_keys()
    return [k for k in keys
            if not k.startswith("journal.md#")
            and k not in ("journal.md", "MEMORY.md", "where-am-i.md",
                          "work-queue.md", "work-state")]


def get_journal_keys(n: int = 0) -> list[str]:
    """Get journal entry keys, sorted by date (newest first).

    If n > 0, return only the last n entries.
    """
    keys = [k for k in list_keys() if k.startswith("journal.md#")]
    # Sort by date embedded in key (journal.md#j-2026-02-28t23-19-slug)
    keys.sort(reverse=True)
    return keys[:n] if n > 0 else keys


def render(key: str) -> str:
    """Render a single node's content."""
    return _run_poc(["render", key])


def get_recent_journal(n: int = 50) -> str:
    """Get recent journal entries as text (replaces reading journal.md)."""
    keys = get_journal_keys(n)
    parts = []
    for key in reversed(keys):  # oldest first
        content = render(key)
        if content:
            parts.append(content)
    return "\n\n".join(parts)


def get_journal_entries_by_date(target_date: str) -> list[dict]:
    """Get journal entries for a specific date (YYYY-MM-DD).

    Returns list of dicts with 'key', 'timestamp', 'text', 'source_ref'.
    """
    keys = get_journal_keys()
    entries = []
    for key in keys:
        # Extract date from key: journal.md#j-2026-02-28t23-19-slug
        m = re.search(r'j-(\d{4}-\d{2}-\d{2})t(\d{2})-(\d{2})', key)
        if not m:
            # Try extracting from unnamed keys by rendering
            content = render(key)
            m2 = re.match(r'^## (\d{4}-\d{2}-\d{2})T(\d{2}):(\d{2})', content)
            if not m2 or m2.group(1) != target_date:
                continue
            entry_date = m2.group(1)
            entry_time = f"{m2.group(2)}:{m2.group(3)}"
        else:
            entry_date = m.group(1)
            entry_time = f"{m.group(2)}:{m.group(3)}"
            if entry_date != target_date:
                continue
            content = render(key)

        # Parse source ref from content
        source_ref = None
        sm = re.search(r'<!-- source: (.+?) -->', content)
        if sm:
            source_ref = sm.group(1)

        # Strip the header line
        text = re.sub(r'^## \d{4}-\d{2}-\d{2}T\d{2}:\d{2}\s*\n?', '', content)

        entries.append({
            "key": key,
            "date": entry_date,
            "time": entry_time,
            "timestamp": f"{entry_date}T{entry_time}",
            "text": text.strip(),
            "source_ref": source_ref,
        })

    return entries


def get_topic_file_index() -> dict[str, list[str]]:
    """Build index of topic files and their section headers.

    Returns {filename: [section_headers]}.
    """
    keys = get_semantic_keys()
    index: dict[str, list[str]] = {}

    for key in keys:
        if '#' in key:
            filename, section = key.split('#', 1)
            if filename not in index:
                index[filename] = []
            index[filename].append(f"## {section}")
        else:
            if key not in index:
                index[key] = []

    return index


def get_topic_summaries(max_chars_per_file: int = 500) -> str:
    """Get summaries of topic file content."""
    index = get_topic_file_index()
    parts = []

    for filename in sorted(index.keys()):
        if filename in ("journal.md", "MEMORY.md", "where-am-i.md",
                        "work-queue.md"):
            continue

        # Render file-level node
        content = render(filename)
        if not content:
            continue

        # Truncate
        if len(content) > max_chars_per_file:
            content = content[:max_chars_per_file] + "\n[...truncated...]"

        parts.append(f"\n### {filename}\n{content}")

    return '\n'.join(parts)


def get_relations() -> str:
    """Get all relations (replaces mem marker parsing)."""
    return _run_poc(["list-edges"])


def get_graph_stats() -> str:
    """Get graph statistics."""
    parts = []
    status = _run_poc(["status"])
    if status:
        parts.append(f"=== poc-memory status ===\n{status}")

    graph = _run_poc(["graph"])
    if graph:
        lines = graph.split('\n')[:150]
        parts.append(f"=== poc-memory graph (first 150 lines) ===\n"
                     + '\n'.join(lines))

    return '\n'.join(parts)


def get_journal_range(start_date: str, end_date: str) -> str:
    """Get journal entries between two dates."""
    keys = get_journal_keys()
    parts = []

    for key in reversed(keys):  # oldest first
        m = re.search(r'j-(\d{4}-\d{2}-\d{2})', key)
        if not m:
            continue
        entry_date = m.group(1)
        if start_date <= entry_date <= end_date:
            content = render(key)
            if content:
                parts.append(content)

    text = "\n\n".join(parts)
    # Cap at ~500 lines
    lines = text.split('\n')
    if len(lines) > 500:
        text = '\n'.join(lines[-500:])
    return text