#!/usr/bin/env bash
# CLAUDE.md Guardian Check Script
# 在 SessionStart 时运行，检查项目变化

set -euo pipefail

# 获取脚本所在目录的父目录（项目根目录）
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
GUARDIAN_DIR="$PROJECT_ROOT/.claude/guardian"
SNAPSHOT_FILE="$GUARDIAN_DIR/snapshot.json"
LOG_FILE="$GUARDIAN_DIR/guardian.log"

# 确保目录存在
mkdir -p "$GUARDIAN_DIR"

log() {
    echo "[$(date '+%Y-%m-%d %H:%M:%S')] $*" >> "$LOG_FILE"
}

# 计算目录结构哈希（使用绝对路径）
get_structure_hash() {
    cd "$PROJECT_ROOT"
    find . -type f \( -name "*.md" -o -name "*.sh" -o -name "*.json" \) \
        ! -path "./content-forge/*" \
        ! -path "./.git/*" \
        ! -path "./node_modules/*" \
        ! -path "./.claude/guardian/*" \
        -exec md5sum {} \; 2>/dev/null | sort | md5sum | cut -d' ' -f1
}

# 获取 skills 列表
get_skills() {
    ls -1 "$PROJECT_ROOT/.claude/skills/" 2>/dev/null | sort | tr '\n' ',' | sed 's/,$//'
}

# 获取 commands 列表
get_commands() {
    ls -1 "$PROJECT_ROOT/.claude/commands/" 2>/dev/null | sed 's/.md$//' | sort | tr '\n' ',' | sed 's/,$//'
}

# 检查是否首次运行
if [[ ! -f "$SNAPSHOT_FILE" ]]; then
    log "首次运行，创建初始快照"

    HASH=$(get_structure_hash)
    SKILLS=$(get_skills)
    COMMANDS=$(get_commands)

    # 创建初始快照
    cat > "$SNAPSHOT_FILE" << EOF
{
  "last_check": "$(date -Iseconds)",
  "structure_hash": "$HASH",
  "skills": "$SKILLS",
  "commands": "$COMMANDS",
  "version": "1.0.0"
}
EOF

    echo "GUARDIAN: 初始化完成，快照已创建"
    exit 0
fi

# 对比变化
CURRENT_HASH=$(get_structure_hash)
STORED_HASH=$(jq -r '.structure_hash' "$SNAPSHOT_FILE")
CURRENT_SKILLS=$(get_skills)
STORED_SKILLS=$(jq -r '.skills' "$SNAPSHOT_FILE")
CURRENT_COMMANDS=$(get_commands)
STORED_COMMANDS=$(jq -r '.commands' "$SNAPSHOT_FILE")

CHANGES=""

if [[ "$CURRENT_HASH" != "$STORED_HASH" ]]; then
    CHANGES="${CHANGES}结构变化 detected\n"
fi

if [[ "$CURRENT_SKILLS" != "$STORED_SKILLS" ]]; then
    CHANGES="${CHANGES}Skills 变化: $STORED_SKILLS -> $CURRENT_SKILLS\n"
fi

if [[ "$CURRENT_COMMANDS" != "$STORED_COMMANDS" ]]; then
    CHANGES="${CHANGES}Commands 变化: $STORED_COMMANDS -> $CURRENT_COMMANDS\n"
fi

if [[ -n "$CHANGES" ]]; then
    log "检测到变化: $CHANGES"

    # 更新快照
    cat > "$SNAPSHOT_FILE" << EOF
{
  "last_check": "$(date -Iseconds)",
  "structure_hash": "$CURRENT_HASH",
  "skills": "$CURRENT_SKILLS",
  "commands": "$CURRENT_COMMANDS",
  "version": "1.0.0"
}
EOF

    echo "GUARDIAN: 检测到项目变化，建议更新 CLAUDE.md"
    echo "变化内容:"
    echo -e "$CHANGES"
    echo ""
    echo "运行 /claudeforge-skill 来更新 CLAUDE.md"
else
    log "无变化"
    # 静默退出，不输出任何内容
fi