# Changelog sync guard: compare source file mtime vs changelog mtime.
# If source files are newer than changelog, inject a followup_message
# reminding the agent to write changelog entries.
#
# 静默条件（不触发提醒）：
#   1. 环境变量 CURSOR_SKIP_CHANGELOG 被设置（由 sessionStart hook 在非 agent 模式设置）
#   2. Debug 模式 — 项目根目录存在 debug-*.log 文件，说明正在调试
#   3. changelog 文件不存在
#   4. .changelog-ack 标记文件存在且足够新（本会话已确认过 changelog 状态）

$input = [Console]::In.ReadToEnd()

# 检测 sessionStart 设置的跳过标志（覆盖一开始就是 debug/ask 模式的场景）
if ($env:CURSOR_SKIP_CHANGELOG) {
    Write-Output '{}'
    exit 0
}

$changelog = ".cursor\changelog\changelog-headlines.md"
$srcDir = "art-agent"

if (-not (Test-Path $changelog)) {
    Write-Output '{}'
    exit 0
}

# 检测 debug 模式：项目中存在活跃的 debug 日志文件
$debugLogs = Get-ChildItem -Path "." -Filter "debug-*.log" -Recurse -Depth 3 -ErrorAction SilentlyContinue |
    Where-Object { $_.FullName -notlike "*node_modules*" -and $_.FullName -notlike "*venv*" }
if ($debugLogs) {
    Write-Output '{}'
    exit 0
}

$clMtime = (Get-Item $changelog).LastWriteTime

# 检测 ack 标记文件：Agent 已确认 changelog 状态（写入或跳过），本会话不再提醒
$ackFile = ".cursor\changelog\.changelog-ack"
if ((Test-Path $ackFile) -and (Get-Item $ackFile).LastWriteTime -ge $clMtime) {
    Write-Output '{}'
    exit 0
}

$extensions = @("*.py", "*.tsx", "*.ts", "*.css")
$excludeDirs = @("node_modules", ".next", "__pycache__", "venv")

$newerFile = $null
foreach ($ext in $extensions) {
    $files = Get-ChildItem -Path $srcDir -Filter $ext -Recurse -ErrorAction SilentlyContinue |
        Where-Object {
            $skip = $false
            foreach ($ex in $excludeDirs) {
                if ($_.FullName -like "*\$ex\*") { $skip = $true; break }
            }
            -not $skip -and $_.LastWriteTime -gt $clMtime
        } |
        Select-Object -First 1

    if ($files) {
        $newerFile = $files.Name
        break
    }
}

if ($newerFile) {
    $msg = "[Hook] Source file updated (e.g. $newerFile) but changelog not synced. Run dev-changelog Skill operation A NOW to write all three changelog layers."
    $json = '{"followup_message":"' + $msg.Replace('"','\"') + '"}'
    Write-Output $json
} else {
    Write-Output '{}'
}
exit 0