#!/usr/bin/env bash
# update-icm-index -- Regenerate INDEX.md at ROOMS_HOME from registry.json
# Idempotent: safe to call multiple times. Overwrites INDEX.md completely.
#
# Usage:
#   scripts/update-icm-index
#   scripts/update-icm-index /path/to/rooms-home
#
# Environment:
#   MINDRIAN_ROOMS_HOME -- override ~/MindrianRooms as central rooms location

set -euo pipefail

ROOMS_HOME="${1:-${MINDRIAN_ROOMS_HOME:-$HOME/MindrianRooms}}"
REGISTRY_FILE="${ROOMS_HOME}/.rooms/registry.json"
INDEX_FILE="${ROOMS_HOME}/INDEX.md"

if [ ! -f "$REGISTRY_FILE" ]; then
  echo "No registry found at $REGISTRY_FILE -- skipping INDEX.md update" >&2
  exit 0
fi

# Generate INDEX.md from registry.json using inline Python
python3 -c "
import json, os, sys, datetime

# RCA windows-python-interp-and-shim: paths arrive via sys.argv, never
# interpolated into this source text (a Windows backslash path would otherwise
# be re-parsed as a Python escape sequence and SyntaxError before this runs).
rooms_home = sys.argv[1]
registry_file = sys.argv[2]

with open(registry_file) as f:
    reg = json.load(f)

rooms = reg.get('rooms', {})
active_rooms = []
archived_rooms = []

for name, room in sorted(rooms.items()):
    status = room.get('status', 'unknown')
    if status == 'archived':
        archived_rooms.append((name, room))
    else:
        active_rooms.append((name, room))

# Count .md entries in each room directory (excluding STATE.md, ROOM.md, USER.md)
def count_entries(room_path):
    abs_path = os.path.join(rooms_home, room_path)
    if not os.path.isdir(abs_path):
        return 0
    count = 0
    for root, dirs, files in os.walk(abs_path):
        # Skip hidden dirs and .context
        dirs[:] = [d for d in dirs if not d.startswith('.')]
        for f in files:
            if f.endswith('.md') and f not in ('STATE.md', 'ROOM.md', 'USER.md', 'INDEX.md', 'CLAUDE.md'):
                count += 1
    return count

def format_date(ts):
    if not ts:
        return '-'
    # Handle both ISO formats
    for fmt in ('%Y-%m-%dT%H:%M:%SZ', '%Y-%m-%dT%H:%M:%S.%f', '%Y-%m-%dT%H:%M:%S.%fZ'):
        try:
            dt = datetime.datetime.strptime(ts, fmt)
            return dt.strftime('%Y-%m-%d')
        except ValueError:
            continue
    # Fallback: just take the date portion
    return ts[:10] if len(ts) >= 10 else ts

# Also scan for _archive/ directories
archive_dirs = []
archive_path = os.path.join(rooms_home, '_archive')
if os.path.isdir(archive_path):
    for d in sorted(os.listdir(archive_path)):
        if os.path.isdir(os.path.join(archive_path, d)):
            archive_dirs.append(d)

lines = []
lines.append('# MindrianRooms -- ICM Layer 1 (Routing)')
lines.append('')
lines.append('**Question answered:** \"Where do I go?\"')
lines.append('')
lines.append('## Active Rooms')
lines.append('')

if active_rooms:
    lines.append('| Room | Venture | Stage | Entries | Last Active |')
    lines.append('|------|---------|-------|---------|-------------|')
    for name, room in active_rooms:
        path = room.get('path', name)
        venture = room.get('venture_name', name)
        stage = room.get('venture_stage', '-')
        entries = count_entries(path)
        last = format_date(room.get('last_opened', ''))
        lines.append(f'| {name}/ | {venture} | {stage} | {entries} | {last} |')
else:
    lines.append('No active rooms. Run \`/mos:new-project\` to create your first room.')

lines.append('')
lines.append('## Archive')
lines.append('')

has_archives = False
if archived_rooms:
    lines.append('| Room | Reason |')
    lines.append('|------|--------|')
    for name, room in archived_rooms:
        lines.append(f'| {name}/ | Archived from registry |')
    has_archives = True

if archive_dirs:
    if not has_archives:
        lines.append('| Room | Reason |')
        lines.append('|------|--------|')
    for d in archive_dirs:
        # Skip if already in archived_rooms
        if not any(name == d for name, _ in archived_rooms):
            lines.append(f'| _archive/{d}/ | Moved to archive |')
    has_archives = True

if not has_archives:
    lines.append('No archived rooms.')

lines.append('')
lines.append('## How to Work in a Room')
lines.append('')
lines.append('1. \`cd ~/MindrianRooms/[room-name]\` then \`claude\`')
lines.append('2. Or from any session: tell Larry \"go to [room name]\"')
lines.append('3. \`/mos:rooms\` manages the registry programmatically')
lines.append('')
lines.append('## Room Creation Rule')
lines.append('')
lines.append('All new rooms MUST be created under ~/MindrianRooms/. The convention:')
lines.append('- Directory name = kebab-case slug (e.g., \`new-venture-name\`)')
lines.append('- Each room is self-contained with its own STATE.md, sections, and graph')
lines.append('- Parent (this directory) holds the index; rooms hold the content')
lines.append('')

output = '\\n'.join(lines)

# Atomic write
index_file = sys.argv[3]
tmp = index_file + '.tmp'
with open(tmp, 'w') as f:
    f.write(output)
os.replace(tmp, index_file)

print(f'INDEX.md updated: {len(active_rooms)} active, {len(archived_rooms)} archived')
" "$ROOMS_HOME" "$REGISTRY_FILE" "$INDEX_FILE"