# check-changelog.ps1 — Claude Code Stop hook (PowerShell 版)
#
# 检查源文件是否比 changelog-headlines.md 更新。如果更新了且本次会话确实有
# 文件编辑操作（通过 transcript_path 确认），提醒用户调用 dev-changelog Skill。
#
# 豁免条件（任一满足则静默退出）：
#   1. changelog-headlines.md 不存在
#   2. .changelog-ack 文件足够新（本会话已通过 checklist 收尾项 Z 确认过）
#   3. stop_hook_active = true（Claude Code 正在从 Stop hook 里再次调用 Claude，避免递归）
#   4. transcript_path 中没有 Write/Edit 工具调用（无编辑证据，防跨会话 mtime 误触发）
#   5. 没有源文件比 changelog 更新

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

# === 豁免 1：stop_hook_active 防递归 ===
$stopHookActive = $false
try {
    $jsonData = $input | ConvertFrom-Json
    $stopHookActive = $jsonData.stop_hook_active -eq $true
} catch {}
if ($stopHookActive) {
    Write-Output '{}'
    exit 0
}

$changelog = ".claude\changelog\changelog-headlines.md"

# === 豁免 2：changelog 文件不存在 ===
if (-not (Test-Path $changelog)) {
    Write-Output '{}'
    exit 0
}

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

# === 豁免 3：ack 标记文件足够新 ===
$ackFile = ".claude\changelog\.changelog-ack"
if (Test-Path $ackFile) {
    $ackItem = Get-Item $ackFile
    $ackMtime = $ackItem.LastWriteTime.ToFileTime()
    if ($ackMtime -ge $clMtime) {
        Write-Output '{}'
        exit 0
    }
}

# === 豁免 4：transcript 中无编辑证据 ===
$transcriptPath = ""
try {
    $jsonData = $input | ConvertFrom-Json
    $transcriptPath = $jsonData.transcript_path
} catch {}

$hasEditEvidence = $false
if ($transcriptPath -and (Test-Path $transcriptPath)) {
    $content = Get-Content $transcriptPath -Raw
    if ($content -match '"name"\s*:\s*"(Write|Edit|MultiEdit|NotebookEdit)"') {
        $hasEditEvidence = $true
    }
}

if (-not $hasEditEvidence) {
    # transcript 不可用或无编辑证据，从保守角度静默
    Write-Output '{}'
    exit 0
}

# === 源目录配置：若项目未自定义则默认扫描整个仓库根（排除常见生成物/依赖）===
$srcDir = "."

# === 核心检查：是否有源文件比 changelog 更新 ===
$sourceExtensions = @("*.py", "*.ts", "*.tsx", "*.js", "*.jsx", "*.css", "*.cs", "*.go", "*.rs", "*.java")
$excludePatterns = @(
    "*\node_modules\*", "*\.next\*", "*\__pycache__\*", "*\venv\*", "*\.venv\*",
    "*\target\*", "*\bin\*", "*\obj\*", "*\.claude\*", "*\.cursor\*", "*\.git\*"
)

$newerFile = $null
foreach ($ext in $sourceExtensions) {
    $files = Get-ChildItem -Path $srcDir -Filter $ext -Recurse -File -ErrorAction SilentlyContinue |
             Where-Object {
                 $item = $_
                 $exclude = $false
                 foreach ($pattern in $excludePatterns) {
                     if ($item.FullName -like $pattern) {
                         $exclude = $true
                         break
                     }
                 }
                 -not $exclude
             } |
             Where-Object { $_.LastWriteTime.ToFileTime() -gt $clMtime }

    if ($files) {
        $newerFile = $files | Select-Object -First 1
        break
    }
}

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