# =====================================================================
# Trae CN 技能安装器（Windows）
# 作用：把本项目 skills\ 下全部技能安装到用户级技能目录
#       %USERPROFILE%\.trae-cn\skills\
# 默认安装全部技能；也可用 -Skills 只装一部分，或用 -DryRun 预览。
# 用法：双击同目录下的 install-skills.bat（推荐），或
#       powershell -NoProfile -ExecutionPolicy Bypass -File install-skills.ps1
#       powershell ... -Skills yt-studio-url-builder,youtube-studio-csv-download
#       powershell ... -DryRun
# =====================================================================

param(
    # 只安装这些技能（逗号/分号/空格分隔，匹配技能文件夹名，不区分大小写）。缺省=全部。
    [string[]]$Skills,
    # 只预览将要安装/备份/跳过的技能，不实际复制。
    [switch]$DryRun
)

$ErrorActionPreference = "Stop"

# --- 1. 定位源目录与目标目录 ---
$ScriptDir    = $PSScriptRoot
$ProjectRoot  = Split-Path -Parent $ScriptDir
$SkillsSource = Join-Path $ProjectRoot "skills"
$TraeSkills   = Join-Path $env:USERPROFILE ".trae-cn\skills"
# 备份放在技能目录外，避免被 Trae 当成技能重复扫描
$BackupRoot   = Join-Path $env:USERPROFILE ".trae-cn\skills-backup"

Write-Host "=== Trae CN 技能安装器 ===" -ForegroundColor Cyan
Write-Host "技能源目录: $SkillsSource"
Write-Host "安装目标:   $TraeSkills"

# 把 -Skills 参数拆成规范化名字列表（兼容逗号/分号/空格分隔）
$skillFilter = @()
if ($Skills) {
    $skillFilter = @(
        $Skills | ForEach-Object { $_ -split '[,;]' } | ForEach-Object { $_.Trim() } |
            Where-Object { $_ }
    )
}

# --- 2. 校验源目录并收集技能（含 SKILL.md 的子目录才算） ---
if (-not (Test-Path $SkillsSource)) {
    Write-Host "[错误] 找不到技能源目录: $SkillsSource" -ForegroundColor Red
    exit 1
}

$allSkills = @(Get-ChildItem -Path $SkillsSource -Directory | Where-Object {
    Test-Path (Join-Path $_.FullName "SKILL.md")
})

if ($allSkills.Count -eq 0) {
    Write-Host "[错误] 源目录下没有可用技能（每个技能文件夹需包含 SKILL.md）。" -ForegroundColor Red
    exit 1
}

# 可选：漏了 SKILL.md 的目录会被跳过；给个提示，避免以为是 bug
$skippedDirs = @(Get-ChildItem -Path $SkillsSource -Directory | Where-Object {
    -not (Test-Path (Join-Path $_.FullName "SKILL.md"))
})
foreach ($d in $skippedDirs) {
    Write-Host "[跳过] $($d.Name)（缺 SKILL.md，不作为技能）" -ForegroundColor DarkGray
}

# 按 -Skills 过滤
$targets = if ($skillFilter.Count -gt 0) {
    $wanted = @($skillFilter | ForEach-Object { $_.ToLowerInvariant() })
    @($allSkills | Where-Object { $wanted -contains $_.Name.ToLowerInvariant() })
} else {
    $allSkills
}

# 过滤后校验：用户指定的技能名是否存在
if ($skillFilter.Count -gt 0 -and $targets.Count -lt $skillFilter.Count) {
    $found = @($targets | ForEach-Object { $_.Name.ToLowerInvariant() })
    $missing = @($skillFilter | Where-Object { $found -notcontains $_.ToLowerInvariant() })
    Write-Host ("[警告] 未找到这些技能: {0}" -f ($missing -join ", ")) -ForegroundColor Yellow
}

if ($targets.Count -eq 0) {
    Write-Host "[错误] 没有待安装的技能（-Skills 指定的技能不存在，或源目录无可用技能）。" -ForegroundColor Red
    exit 1
}

# --- 3. 读取每个技能的 frontmatter name，并校验其与文件夹名一致 ---
# 预测性关键：Trae 以 frontmatter 的 name 作为技能名，若与文件夹名不一致会引发歧义/旧名残留。
$warnCount = 0
foreach ($skill in $targets) {
    $skillFile = Join-Path $skill.FullName "SKILL.md"
    $fmName = $null
    try {
        $lines = Get-Content -Path $skillFile -TotalCount 6 -Encoding UTF8
        foreach ($l in $lines) {
            if ($l -match '^\s*name\s*[:=]\s*["'']([^"'']+)["'']') {
                $fmName = $Matches[1]
                break
            }
        }
    } catch {
        # 读取失败不阻塞安装
    }
    if ($fmName -and $fmName -ne $skill.Name) {
        $warnCount++
        Write-Host ("[警告] {0}: frontmatter name 为 {1}，与文件夹名不一致。" -f $skill.Name, $fmName) -ForegroundColor Yellow
    } elseif (-not $fmName) {
        $warnCount++
        Write-Host ("[警告] {0}: SKILL.md 顶部未解析到 name，安装后可能无法触发。" -f $skill.Name) -ForegroundColor Yellow
    }
}

Write-Host ("发现 {0} 个技能: {1}" -f $targets.Count, ($targets.Name -join ", "))
Write-Host ""

# --- 4. 计算操作（备份/安装）并可选预览 ---
function Test-SkillInstalled([string]$skillName) {
    return Test-Path (Join-Path $TraeSkills $skillName)
}

$toBackup = @($targets | Where-Object { Test-SkillInstalled $_.Name })
$toFresh  = @($targets | Where-Object { -not (Test-SkillInstalled $_.Name) })

if ($DryRun) {
    Write-Host "== 预览（未执行）==" -ForegroundColor Cyan
    if ($toFresh.Count -gt 0) {
        Write-Host ("  新安装 {0}: {1}" -f $toFresh.Count, ($toFresh.Name -join ", "))
    }
    if ($toBackup.Count -gt 0) {
        Write-Host ("  覆盖安装（旧版将备份）{0}: {1}" -f $toBackup.Count, ($toBackup.Name -join ", "))
    }
    Write-Host "  总技能数: $($targets.Count)"
    Write-Host "同步目录: $TraeSkills"
    Write-Host "备份目录: $BackupRoot"
    Write-Host "[DryRun] 完成，未做任何修改。" -ForegroundColor Green
    exit 0
}

# --- 5. 执行安装 ---
New-Item -ItemType Directory -Force -Path $TraeSkills | Out-Null

$timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
$backupCount = 0

foreach ($skill in $targets) {
    $dest = Join-Path $TraeSkills $skill.Name

    if (Test-Path $dest) {
        New-Item -ItemType Directory -Force -Path $BackupRoot | Out-Null
        $backupPath = Join-Path $BackupRoot ("{0}-{1}" -f $skill.Name, $timestamp)
        Move-Item -Path $dest -Destination $backupPath
        $backupCount++
        Write-Host "[备份] $($skill.Name) 旧版 -> $backupPath" -ForegroundColor Yellow
    }

    Copy-Item -Path $skill.FullName -Destination $dest -Recurse -Force
    Write-Host "[安装] $($skill.Name)" -ForegroundColor Green
}

# --- 6. 校验安装结果 ---
Write-Host ""
Write-Host "=== 校验结果 ==="
$failed = @()
foreach ($skill in $targets) {
    if (Test-Path (Join-Path $TraeSkills "$($skill.Name)\SKILL.md")) {
        Write-Host "  [OK]   $($skill.Name)" -ForegroundColor Green
    } else {
        Write-Host "  [FAIL] $($skill.Name)" -ForegroundColor Red
        $failed += $skill.Name
    }
}

# --- 7. 汇总与后续提示 ---
Write-Host ""
if ($failed.Count -gt 0) {
    Write-Host ("安装失败: {0}" -f ($failed -join ", ")) -ForegroundColor Red
    exit 2
}

Write-Host "全部安装成功。" -ForegroundColor Green
Write-Host ("本次：新建 {0} 个，覆盖 {1} 个（备份到技能目录外的 backups）。" -f $toFresh.Count, $toBackup.Count) -ForegroundColor Green
if ($warnCount -gt 0) {
    Write-Host ("注意：{0} 处 name/文件夹不一致或缺 name 的可疑技能（见上方警告）。" -f $warnCount) -ForegroundColor Yellow
}
if ($backupCount -gt 0) {
    Write-Host "旧版本备份于: $BackupRoot（确认新版可用后可手动删除）" -ForegroundColor Yellow
}

Write-Host ""
Write-Host "下一步: 重启 Trae CN 或新建会话后，在对话中提及技能名或相关意图即可触发:"
foreach ($s in $targets) {
    Write-Host "  - $($s.Name)"
}