function Invoke-TerraformMultiCloud {
    [CmdletBinding(SupportsShouldProcess=$true)]
    param(
        [Parameter(Mandatory=$true)]
        [ValidateSet('Azure','AWS','GCP')]
        [string[]]$CloudProviders,
        
        [string]$TfWorkingDir = '$PSScriptRoot/terraform'
    )

    $stateReport = [PSCustomObject]@{
        Timestamp = Get-Date -Format 'yyyy-MM-dd HH:mm:ss'
        DeploymentStatus = @{}
        ResourceCounts = @{}
        CrossCloudDependencies = @()
    }

    try {
        # 初始化多供应商terraform工作区
        $CloudProviders | ForEach-Object {
            if ($PSCmdlet.ShouldProcess("Initialize $_ provider")) {
                terraform -chdir=$TfWorkingDir init -backend-config="$_backend.hcl"
            }
        }

        # 执行跨云资源编排
        $planOutput = terraform -chdir=$TfWorkingDir plan -out=multicloud.tfplan
        $stateReport.DeploymentStatus['Plan'] = $planOutput -match 'No changes' ? 'Stable' : 'Pending'

        # 自动化应用配置
        if ($planOutput -match 'to add') {
            $applyOutput = terraform -chdir=$TfWorkingDir apply -auto-approve multicloud.tfplan
            $stateReport.DeploymentStatus['Apply'] = $applyOutput -match 'Apply complete' ? 'Success' : 'Failed'
        }

        # 获取跨云资源状态
        $tfState = terraform -chdir=$TfWorkingDir show -json | ConvertFrom-Json
        $stateReport.ResourceCounts = $tfState.resources | 
            Group-Object provider_name | 
            ForEach-Object {@{$_.Name = $_.Count}} 

        # 分析云间依赖关系
        $stateReport.CrossCloudDependencies = $tfState.resources | 
            Where-Object { $_.depends_on -match 'aws_|azurerm_' } | 
            Select-Object type, provider
    }
    catch {
        Write-Error "多云部署失败: $_"
        terraform -chdir=$TfWorkingDir destroy -auto-approve
    }

    # 生成基础设施即代码报告
    $stateReport | Export-Csv -Path "$env:TEMP/MultiCloudReport_$(Get-Date -Format yyyyMMdd).csv"
    return $stateReport
}

function Get-CloudCostReport {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory=$true)]
        [string[]]$SubscriptionIds,
        
        [ValidateSet('Daily','Monthly')]
        [string]$Granularity = 'Monthly'
    )

    $costReport = [PSCustomObject]@{
        Timestamp = Get-Date -Format 'yyyy-MM-dd HH:mm:ss'
        TotalCost = 0
        ServiceBreakdown = @{}
        OptimizationSuggestions = @()
    }

    try {
        # 获取跨云成本数据
        $costData = $SubscriptionIds | ForEach-Object {
            Invoke-RestMethod -Uri "https://management.azure.com/subscriptions/$_/providers/Microsoft.CostManagement/query?api-version=2023-03-01" \
                -Headers @{ Authorization = "Bearer $env:AZURE_TOKEN" } \
                -Body (@{
                    type = "ActualCost"
                    timeframe = "MonthToDate"
                    dataset = @{
                        aggregation = @{
                            totalCost = @{
                                name = "Cost"
                                function = "Sum"
                            }
                        }
                        grouping = @(
                            @{
                                type = "Dimension"
                                name = "ServiceName"
                            }
                        )
                    }
                } | ConvertTo-Json)
        }

        # 分析成本结构
        $costReport.TotalCost = ($costData.properties.rows | Measure-Object -Property [0] -Sum).Sum
        $costReport.ServiceBreakdown = $costData.properties.rows | 
            Group-Object { $_[1] } -AsHashTable | 
            ForEach-Object { @{$_.Key = [math]::Round($_.Value[0],2)} }

        # 生成优化建议
        $costData.properties.rows | Where-Object { $_[0] -gt 1000 } | ForEach-Object {
            $costReport.OptimizationSuggestions += [PSCustomObject]@{
                Service = $_[1]
                Cost = $_[0]
                Recommendation = "考虑预留实例或自动缩放配置"
            }
        }
    }
    catch {
        Write-Error "成本数据获取失败: $_"
    }

    # 生成Excel格式报告
    $costReport | Export-Excel -Path "$env:TEMP/CloudCostReport_$(Get-Date -Format yyyyMMdd).xlsx"
    return $costReport
}