#!/usr/bin/env bash
# Changelog sync guard：比较 Godot 源码/配置与本会话起点、changelog 的 mtime。

emit_empty() {
    printf '{}\n'
}

cat >/dev/null

if [ -n "${CURSOR_SKIP_CHANGELOG:-}" ]; then
    emit_empty
    exit 0
fi

script_dir=$(CDPATH= cd -- "$(dirname -- "${BASH_SOURCE[0]}")" 2>/dev/null && pwd)
cursor_dir=$(dirname -- "$script_dir")
repo_root=$(dirname -- "$cursor_dir")
changelog="$cursor_dir/changelog/changelog-headlines.md"
ack_file="$cursor_dir/changelog/.changelog-ack"
session_marker="$cursor_dir/changelog/.session-start"

if [ ! -f "$changelog" ]; then
    emit_empty
    exit 0
fi

get_mtime() {
    stat -c %Y "$1" 2>/dev/null || stat -f %m "$1" 2>/dev/null
}

if [ -f "$ack_file" ]; then
    changelog_mtime=$(get_mtime "$changelog")
    ack_mtime=$(get_mtime "$ack_file")
    if [ -n "$changelog_mtime" ] && [ -n "$ack_mtime" ] &&
        [ "$ack_mtime" -ge "$changelog_mtime" ] 2>/dev/null; then
        emit_empty
        exit 0
    fi
fi

comparison_file=$changelog
if [ -f "$session_marker" ]; then
    changelog_mtime=$(get_mtime "$changelog")
    session_mtime=$(get_mtime "$session_marker")
    if [ -n "$changelog_mtime" ] && [ -n "$session_mtime" ] &&
        [ "$session_mtime" -gt "$changelog_mtime" ] 2>/dev/null; then
        comparison_file=$session_marker
    fi
fi

newer_file=''
while IFS= read -r candidate; do
    newer_file=$candidate
    break
done < <(
    find "$repo_root" \
        \( -type d \( \
            -name '.git' -o \
            -name '.cursor' -o \
            -name '.godot' -o \
            -name 'node_modules' -o \
            -name '__pycache__' -o \
            -name 'venv' -o \
            -name '.venv' -o \
            -name 'dist' -o \
            -name 'build' -o \
            -name 'out' -o \
            -name 'bin' -o \
            -name 'obj' -o \
            -name 'export' -o \
            -name 'exports' -o \
            -name 'coverage' -o \
            -name 'tmp' -o \
            -name 'temp' \
        \) -prune \) -o \
        \( -type f \( \
            -iname 'project.godot' -o \
            -iname '*.gd' -o \
            -iname '*.tscn' -o \
            -iname '*.tres' -o \
            -iname '*.res' -o \
            -iname '*.gdshader' -o \
            -iname '*.cfg' -o \
            -iname '*.json' -o \
            -iname '*.cs' -o \
            -iname '*.csproj' -o \
            -iname '*.py' -o \
            -iname '*.ps1' -o \
            -iname '*.sh' \
        \) -newer "$comparison_file" -print \) 2>/dev/null
)

if [ -z "$newer_file" ]; then
    emit_empty
    exit 0
fi

relative_file=${newer_file#"$repo_root"/}
message="[Hook] Godot source/config is newer than the changelog (e.g. $relative_file). Run dev-changelog Skill operation A now: add a fragment under .cursor/changelog/entries/ and rebuild the changelog views."

python_cmd=''
for candidate in python3 python; do
    if command -v "$candidate" >/dev/null 2>&1 &&
        "$candidate" -c 'import json' >/dev/null 2>&1; then
        python_cmd=$candidate
        break
    fi
done

if [ -n "$python_cmd" ]; then
    result=$(
        printf '%s' "$message" | "$python_cmd" -c '
import json
import sys

print(json.dumps(
    {"followup_message": sys.stdin.read()},
    ensure_ascii=False,
    separators=(",", ":"),
))
' 2>/dev/null
    ) || result='{}'
    if [ -n "$result" ]; then
        printf '%s\n' "$result"
    else
        emit_empty
    fi
else
    emit_empty
fi

exit 0