#!/usr/bin/env bash
# Sync Cursor-style agent rules to Codex-friendly markdown and generate AGENTS.override.md.
# Usage: sync-codex.sh [agents_dir] [base_agents_md] [output_override]

set -euo pipefail

agents_dir="${1:-.agents}"
base_agents_md="${2:-AGENTS.md}"
output_override="${3:-AGENTS.override.md}"

rules_dir="${agents_dir}/rules"
generated_rules_dir="${agents_dir}/generated/codex/rules"
script_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"

if [[ ! -f "$base_agents_md" ]]; then
    echo "Error: base AGENTS file '$base_agents_md' does not exist." >&2
    exit 1
fi

if [[ ! -d "$rules_dir" ]]; then
    echo "Error: rules directory '$rules_dir' does not exist." >&2
    exit 1
fi

mkdir -p "$generated_rules_dir"
find "$generated_rules_dir" -type f -name "*.md" -delete

mapfile -t rule_sources < <(find "$rules_dir" -type f -name "*.mdc" | sort)

for src in "${rule_sources[@]}"; do
    rel="${src#$rules_dir/}"
    dest="$generated_rules_dir/${rel%.mdc}.md"
    mkdir -p "$(dirname "$dest")"
    "$script_dir/convert-frontmatter.sh" cursor-to-codex "$src" "$dest"
done

tmp_file="$(mktemp "${TMPDIR:-/tmp}/codex-agents-override.XXXXXX")"
trap 'rm -f "$tmp_file"' EXIT

{
    echo "<!-- Generated by make codex (scripts/sync-codex.sh). Do not edit manually. -->"
    echo "<!-- Sources: $base_agents_md + $rules_dir/*.mdc -->"
    echo
    cat "$base_agents_md"
    echo
    echo "---"
    echo
    echo "## Codex Rule Supplements"
    echo "- Generated from \`$rules_dir/*.mdc\`."
    echo "- Regenerate with \`make codex\`."

    for src in "${rule_sources[@]}"; do
        rel="${src#$rules_dir/}"
        generated="$generated_rules_dir/${rel%.mdc}.md"
        echo
        echo "---"
        echo
        echo "<!-- BEGIN $src -->"
        cat "$generated"
        echo
        echo "<!-- END $src -->"
    done
} > "$tmp_file"

mv "$tmp_file" "$output_override"
trap - EXIT

echo "Generated $output_override"
echo "Generated Codex rule markdown under $generated_rules_dir"