#!/usr/bin/env bash
set -euo pipefail

DEMO_DIR="${1:-muse-content-addressing-episode00}"

command -v muse >/dev/null 2>&1 || { echo "error: muse not found on PATH" >&2; exit 1; }
command -v python3 >/dev/null 2>&1 || { echo "error: python3 not found on PATH" >&2; exit 1; }

rm -rf "$DEMO_DIR"
mkdir -p "$DEMO_DIR"
cd "$DEMO_DIR"

muse init --domain code

cat > engine.py <<'PY'
def render_state(state):
    return {"status": "ready", "items": list(state)}
PY

cat > README.md <<'MD'
# Episode 00 — Content Addressing Demo
Tiny repo for objects, snapshots, commits, branches, DAGs, and domain semantics.
MD

muse commit -m "Baseline: render structured state"

cat >> engine.py <<'PY'

def validate_state(state):
    return all(item is not None for item in state)
PY
muse commit -m "Add state validation"

muse checkout -b feature/render

cat > formatter.py <<'PY'
def format_item(item):
    return f"[{item}]"
PY

cat >> engine.py <<'PY'

def render_item(item):
    from formatter import format_item
    return format_item(item)
PY
muse commit -m "Feature: semantic item formatting"

muse checkout main
muse checkout -b feature/metrics

cat > metrics.py <<'PY'
def count_items(state):
    return len(state)
PY
muse commit -m "Feature: state metrics"

muse checkout main
muse merge feature/render
muse merge feature/metrics

mkdir -p demo-bytes
printf 'Muse content-addressed object\n' > demo-bytes/object-a.txt
cp demo-bytes/object-a.txt demo-bytes/object-b-identical.txt
printf 'Muse content-addressed object!\n' > demo-bytes/object-c-changed.txt

echo
echo "Ready in: $(pwd)"
echo "Run the screenshot commands from inside this directory."