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

script_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" && pwd)"
repo_root="$(cd -- "$script_dir/.." && pwd)"
prompt_file="${RELEASE_PROMPT_FILE:-"$repo_root/scripts/release-prompt.txt"}"

if ! command -v codex >/dev/null 2>&1; then
    echo "generate-release-note.sh: codex CLI is required but was not found in PATH." >&2
    exit 127
fi

if [[ ! -f "$prompt_file" ]]; then
    echo "generate-release-note.sh: prompt file not found: $prompt_file" >&2
    exit 1
fi

commit_messages="$(cat)"

if [[ -z "${commit_messages//[[:space:]]/}" ]]; then
    echo "generate-release-note.sh: expected commit messages on stdin." >&2
    echo "Example: git log --oneline -n 20 | ./scripts/generate-release-note.sh" >&2
    exit 1
fi

prompt_tmp="$(mktemp)"
output_tmp="$(mktemp)"
log_tmp="$(mktemp)"

cleanup() {
    rm -f "$prompt_tmp" "$output_tmp" "$log_tmp"
}
trap cleanup EXIT

while IFS= read -r line || [[ -n "$line" ]]; do
    if [[ "$line" == *"<PASTE_COMMIT_MESSAGES_HERE>"* ]]; then
        printf '%s\n' "${line//<PASTE_COMMIT_MESSAGES_HERE>/$commit_messages}"
    else
        printf '%s\n' "$line"
    fi
done < "$prompt_file" > "$prompt_tmp"

if ! codex \
    --ask-for-approval never \
    exec \
    --cd "$repo_root" \
    --ephemeral \
    --sandbox read-only \
    --color never \
    --output-last-message "$output_tmp" \
    - < "$prompt_tmp" > "$log_tmp" 2>&1; then
    cat "$log_tmp" >&2
    exit 1
fi

cat "$output_tmp"