# Copyright (c) Microsoft Corporation.
# SPDX-License-Identifier: MIT

# CIHelpers.psm1
#
# Purpose: Shared CI platform detection and output utilities for hve-core scripts.
# Author: HVE Core Team

#Requires -Version 7.0

function ConvertTo-GitHubActionsEscaped {
    <#
    .SYNOPSIS
    Escapes a string for safe use in GitHub Actions workflow commands.

    .DESCRIPTION
    Percent-encodes characters that have special meaning in GitHub Actions
    logging commands to prevent workflow command injection attacks.

    .PARAMETER Value
    The string to escape.

    .PARAMETER ForProperty
    If set, also escapes colon and comma characters used in property values.
    #>
    [CmdletBinding()]
    [OutputType([string])]
    param(
        [Parameter(Mandatory = $true)]
        [AllowEmptyString()]
        [string]$Value,

        [Parameter(Mandatory = $false)]
        [switch]$ForProperty
    )

    if ([string]::IsNullOrEmpty($Value)) {
        return $Value
    }

    # Order matters: escape % first to avoid double-encoding
    $escaped = $Value -replace '%', '%25'
    $escaped = $escaped -replace "`r", '%0D'
    $escaped = $escaped -replace "`n", '%0A'
    # Escape :: patterns to neutralize command sequences (defense in depth)
    # This prevents ::command:: patterns. When ForProperty is false, single colons like C:\ are preserved.
    $escaped = $escaped -replace '::', '%3A%3A'

    if ($ForProperty) {
        $escaped = $escaped -replace ':', '%3A'
        $escaped = $escaped -replace ',', '%2C'
    }

    return $escaped
}

function ConvertTo-AzureDevOpsEscaped {
    <#
    .SYNOPSIS
    Escapes a string for safe use in Azure DevOps logging commands.

    .DESCRIPTION
    Percent-encodes characters that have special meaning in Azure DevOps
    logging commands to prevent workflow command injection attacks.

    .PARAMETER Value
    The string to escape.

    .PARAMETER ForProperty
    If set, also escapes semicolon and bracket characters used in property values.
    #>
    [CmdletBinding()]
    [OutputType([string])]
    param(
        [Parameter(Mandatory = $true)]
        [AllowEmptyString()]
        [string]$Value,

        [Parameter(Mandatory = $false)]
        [switch]$ForProperty
    )

    if ([string]::IsNullOrEmpty($Value)) {
        return $Value
    }

    # Order matters: escape % first to avoid double-encoding
    $escaped = $Value -replace '%', '%AZP25'
    $escaped = $escaped -replace "`r", '%AZP0D'
    $escaped = $escaped -replace "`n", '%AZP0A'
    # Escape brackets to prevent ##vso[ command patterns (defense in depth)
    $escaped = $escaped -replace '\[', '%AZP5B'
    $escaped = $escaped -replace '\]', '%AZP5D'

    if ($ForProperty) {
        $escaped = $escaped -replace ';', '%AZP3B'
    }

    return $escaped
}

function Get-CIPlatform {
    <#
    .SYNOPSIS
    Detects the current CI platform.

    .DESCRIPTION
    Returns the CI platform identifier based on environment variables.
    Supports GitHub Actions, Azure DevOps, and local development.

    .OUTPUTS
    System.String - 'github', 'azdo', or 'local'
    #>
    [CmdletBinding()]
    [OutputType([string])]
    param()

    if ($env:GITHUB_ACTIONS -eq 'true') {
        return 'github'
    }
    if ($env:TF_BUILD -eq 'True' -or $env:AZURE_PIPELINES -eq 'True') {
        return 'azdo'
    }
    return 'local'
}

function Test-CIEnvironment {
    <#
    .SYNOPSIS
    Tests whether running in a CI environment.

    .DESCRIPTION
    Returns true if running in GitHub Actions or Azure DevOps.

    .OUTPUTS
    System.Boolean - $true if in CI, $false otherwise
    #>
    [CmdletBinding()]
    [OutputType([bool])]
    param()

    return (Get-CIPlatform) -ne 'local'
}

function Set-CIOutput {
    <#
    .SYNOPSIS
    Sets a CI output variable.

    .DESCRIPTION
    Sets an output variable that can be consumed by subsequent workflow steps.
    Uses GITHUB_OUTPUT for GitHub Actions and task.setvariable for Azure DevOps.

    .PARAMETER Name
    The variable name.

    .PARAMETER Value
    The variable value.

    .PARAMETER IsOutput
    For Azure DevOps, marks the variable as an output variable.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        [string]$Name,

        [Parameter(Mandatory = $true)]
        [string]$Value,

        [Parameter(Mandatory = $false)]
        [switch]$IsOutput
    )

    $platform = Get-CIPlatform

    switch ($platform) {
        'github' {
            if ($env:GITHUB_OUTPUT) {
                # GITHUB_OUTPUT uses file-based output, less vulnerable but still escape newlines
                $escapedName = ConvertTo-GitHubActionsEscaped -Value $Name
                $escapedValue = ConvertTo-GitHubActionsEscaped -Value $Value
                "$escapedName=$escapedValue" | Out-File -FilePath $env:GITHUB_OUTPUT -Append -Encoding utf8
            }
            else {
                Write-Verbose "GITHUB_OUTPUT not set, would set: $Name=$Value"
            }
        }
        'azdo' {
            $outputFlag = if ($IsOutput) { ';isOutput=true' } else { '' }
            $escapedName = ConvertTo-AzureDevOpsEscaped -Value $Name -ForProperty
            $escapedValue = ConvertTo-AzureDevOpsEscaped -Value $Value
            Write-Output "##vso[task.setvariable variable=$escapedName$outputFlag]$escapedValue"
        }
        'local' {
            Write-Verbose "CI Output: $Name=$Value"
        }
    }
}

function Set-CIEnv {
    <#
    .SYNOPSIS
    Sets a CI environment variable.

    .DESCRIPTION
    Writes environment variables for GitHub Actions or Azure DevOps.

    .PARAMETER Name
    The environment variable name.

    .PARAMETER Value
    The environment variable value.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        [string]$Name,

        [Parameter(Mandatory = $true)]
        [string]$Value
    )

    $platform = Get-CIPlatform

    switch ($platform) {
        'github' {
            if ($env:GITHUB_ENV) {
                if ($Name -notmatch '^[A-Za-z_][A-Za-z0-9_]*$') {
                    throw "Invalid GitHub Actions environment variable name: '$Name'. Names must match '^[A-Za-z_][A-Za-z0-9_]*\$'."
                }

                $delimiter = "EOF_$([guid]::NewGuid().ToString('N'))"
                @(
                    "$Name<<$delimiter"
                    $Value
                    $delimiter
                ) | Out-File -FilePath $env:GITHUB_ENV -Append -Encoding utf8
            }
            else {
                Write-Verbose "GITHUB_ENV not set, would set: $Name=$Value"
            }
        }
        'azdo' {
            $escapedName = ConvertTo-AzureDevOpsEscaped -Value $Name -ForProperty
            $escapedValue = ConvertTo-AzureDevOpsEscaped -Value $Value
            Write-Output "##vso[task.setvariable variable=$escapedName]$escapedValue"
        }
        'local' {
            Write-Verbose "CI Env: $Name=$Value"
        }
    }
}

function Write-CIStepSummary {
    <#
    .SYNOPSIS
    Writes content to the CI step summary.

    .DESCRIPTION
    Appends markdown content to the step summary for GitHub Actions.
    For Azure DevOps, outputs as a section header and content.

    .PARAMETER Content
    The markdown content to append.

    .PARAMETER Path
    Path to a file containing markdown content.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true, ParameterSetName = 'Content')]
        [string]$Content,

        [Parameter(Mandatory = $true, ParameterSetName = 'Path')]
        [string]$Path
    )

    $platform = Get-CIPlatform
    $markdown = if ($PSCmdlet.ParameterSetName -eq 'Path') {
        Get-Content -Path $Path -Raw
    }
    else {
        $Content
    }

    switch ($platform) {
        'github' {
            if ($env:GITHUB_STEP_SUMMARY) {
                $markdown | Out-File -FilePath $env:GITHUB_STEP_SUMMARY -Append -Encoding utf8
            }
            else {
                Write-Verbose "GITHUB_STEP_SUMMARY not set"
                Write-Verbose $markdown
            }
        }
        'azdo' {
            Write-Output "##[section]Step Summary"
            Write-Output $markdown
        }
        'local' {
            Write-Verbose "Step Summary:"
            Write-Verbose $markdown
        }
    }
}

function Write-CIAnnotation {
    <#
    .SYNOPSIS
    Writes a CI annotation (warning, error, notice).

    .DESCRIPTION
    Creates a workflow annotation that appears in the GitHub Actions or Azure DevOps UI.

    .PARAMETER Message
    The annotation message.

    .PARAMETER Level
    The severity level: Warning, Error, or Notice.

    .PARAMETER File
    Optional file path for file-level annotations.

    .PARAMETER Line
    Optional line number for the annotation.

    .PARAMETER Column
    Optional column number for the annotation.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        [AllowEmptyString()]
        [string]$Message,

        [Parameter(Mandatory = $false)]
        [ValidateSet('Warning', 'Error', 'Notice')]
        [string]$Level = 'Warning',

        [Parameter(Mandatory = $false)]
        [string]$File,

        [Parameter(Mandatory = $false)]
        [int]$Line,

        [Parameter(Mandatory = $false)]
        [int]$Column
    )

    $platform = Get-CIPlatform

    switch ($platform) {
        'github' {
            $levelLower = $Level.ToLower()
            $annotation = "::$levelLower"
            $params = @()
            if ($File) {
                $normalizedFile = $File -replace '\\', '/'
                $escapedFile = ConvertTo-GitHubActionsEscaped -Value $normalizedFile -ForProperty
                $params += "file=$escapedFile"
            }
            if ($Line -gt 0) { $params += "line=$Line" }
            if ($Column -gt 0) { $params += "col=$Column" }
            if ($params.Count -gt 0) {
                $annotation += " $($params -join ',')"
            }
            $escapedMessage = ConvertTo-GitHubActionsEscaped -Value $Message
            Write-Host "$annotation::$escapedMessage"
        }
        'azdo' {
            $typeMap = @{
                'Warning' = 'warning'
                'Error'   = 'error'
                'Notice'  = 'info'
            }
            $adoType = $typeMap[$Level]
            $annotation = "##vso[task.logissue type=$adoType"
            if ($File) {
                $escapedFile = ConvertTo-AzureDevOpsEscaped -Value $File -ForProperty
                $annotation += ";sourcepath=$escapedFile"
            }
            if ($Line -gt 0) { $annotation += ";linenumber=$Line" }
            if ($Column -gt 0) { $annotation += ";columnnumber=$Column" }
            $escapedMessage = ConvertTo-AzureDevOpsEscaped -Value $Message
            Write-Host "$annotation]$escapedMessage"
        }
        'local' {
            $prefix = switch ($Level) {
                'Warning' { 'WARNING' }
                'Error' { 'ERROR' }
                'Notice' { 'NOTICE' }
            }
            $location = if ($File) { " [$File" + $(if ($Line) { ":$Line" } else { '' }) + ']' } else { '' }
            Write-Warning "$prefix$location $Message"
        }
    }
}

function Write-CIAnnotations {
    <#
    .SYNOPSIS
    Writes CI annotations for summary results.

    .DESCRIPTION
    Emits annotations for each issue in a summary object, mapping errors and warnings
    to the platform-specific annotation formats.

    .PARAMETER Summary
    Summary object containing Results with Issues and file metadata.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        $Summary
    )

    if (-not $Summary -or -not $Summary.Results) {
        return
    }

    foreach ($result in $Summary.Results) {
        if (-not $result -or -not $result.Issues) {
            continue
        }

        foreach ($issue in $result.Issues) {
            if (-not $issue) {
                continue
            }

            # Skip issues with null or empty messages
            if ([string]::IsNullOrWhiteSpace($issue.Message)) {
                continue
            }

            $level = if ($issue.Type -eq 'Error') { 'Error' } else { 'Warning' }
            $line = if ($issue.Line -gt 0) { $issue.Line } else { 1 }
            $filePath = if ($result.RelativePath) { $result.RelativePath } elseif ($issue.FilePath) { $issue.FilePath } else { $null }

            $annotationParams = @{
                Message = [string]$issue.Message
                Level   = $level
            }

            if ($filePath) {
                $annotationParams['File'] = [string]$filePath
                $annotationParams['Line'] = $line
            }

            if ($issue.Column -gt 0) {
                $annotationParams['Column'] = $issue.Column
            }

            Write-CIAnnotation @annotationParams
        }
    }
}

function Set-CITaskResult {
    <#
    .SYNOPSIS
    Sets the CI task/step result status.

    .DESCRIPTION
    Sets the overall result of the current task or step.

    .PARAMETER Result
    The result status: Succeeded, SucceededWithIssues, or Failed.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        [ValidateSet('Succeeded', 'SucceededWithIssues', 'Failed')]
        [string]$Result
    )

    $platform = Get-CIPlatform

    switch ($platform) {
        'github' {
            Write-Verbose "GitHub Actions task result: $Result"
            if ($Result -eq 'Failed') {
                Write-Output "::error::Task failed"
            }
        }
        'azdo' {
            Write-Output "##vso[task.complete result=$Result]"
        }
        'local' {
            Write-Verbose "Task result: $Result"
        }
    }
}

function Publish-CIArtifact {
    <#
    .SYNOPSIS
    Publishes a CI artifact.

    .DESCRIPTION
    Publishes a file or folder as a CI artifact.
    For GitHub Actions, outputs the path for use with actions/upload-artifact.
    For Azure DevOps, uses the artifact.upload command.

    .PARAMETER Path
    The path to the file or folder to publish.

    .PARAMETER Name
    The artifact name.

    .PARAMETER ContainerFolder
    For Azure DevOps, the container folder path within the artifact.
    #>
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)]
        [string]$Path,

        [Parameter(Mandatory = $true)]
        [string]$Name,

        [Parameter(Mandatory = $false)]
        [string]$ContainerFolder
    )

    $platform = Get-CIPlatform

    if (-not (Test-Path $Path)) {
        Write-Warning "Artifact path not found: $Path"
        return
    }

    switch ($platform) {
        'github' {
            Set-CIOutput -Name "artifact-path-$Name" -Value $Path
            Set-CIOutput -Name "artifact-name-$Name" -Value $Name
            Write-Verbose "GitHub artifact ready: $Name at $Path"
        }
        'azdo' {
            $container = if ($ContainerFolder) { $ContainerFolder } else { $Name }
            $escapedContainer = ConvertTo-AzureDevOpsEscaped -Value $container -ForProperty
            $escapedName = ConvertTo-AzureDevOpsEscaped -Value $Name -ForProperty
            $escapedPath = ConvertTo-AzureDevOpsEscaped -Value $Path
            Write-Output "##vso[artifact.upload containerfolder=$escapedContainer;artifactname=$escapedName]$escapedPath"
        }
        'local' {
            Write-Verbose "Artifact: $Name at $Path"
        }
    }
}

function Get-StandardTimestamp {
    <#
    .SYNOPSIS
    Returns the current UTC time as an ISO 8601 string.

    .DESCRIPTION
    Returns the current UTC time formatted with the round-trip specifier ("o"),
    producing a string such as "2025-01-15T18:30:00.0000000Z". Use this
    function wherever a timestamp is needed to ensure consistent, timezone-
    unambiguous log output across all scripts.

    .OUTPUTS
    System.String - UTC timestamp in ISO 8601 round-trip format ending in Z.
    #>
    [CmdletBinding()]
    [OutputType([string])]
    param()

    return (Get-Date).ToUniversalTime().ToString('o')
}

function Get-StandardTimestampPattern {
    <#
    .SYNOPSIS
    Returns the regex pattern that matches Get-StandardTimestamp output.

    .DESCRIPTION
    Returns a single-source regex anchored to the ISO 8601 round-trip format
    produced by Get-StandardTimestamp (e.g. "2025-01-15T18:30:00.0000000Z").
    Use this function in tests instead of hard-coding the pattern so that all
    assertions stay in sync when the timestamp format changes.

    .OUTPUTS
    System.String - Anchored regex pattern for ISO 8601 UTC timestamps.
    #>
    [CmdletBinding()]
    [OutputType([string])]
    param()

    return '^\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}\.\d+Z$'
}

Export-ModuleMember -Function @(
    'Get-StandardTimestamp',
    'Get-StandardTimestampPattern',
    'ConvertTo-GitHubActionsEscaped',
    'ConvertTo-AzureDevOpsEscaped',
    'Get-CIPlatform',
    'Test-CIEnvironment',
    'Set-CIOutput',
    'Set-CIEnv',
    'Write-CIStepSummary',
    'Write-CIAnnotation',
    'Write-CIAnnotations',
    'Set-CITaskResult',
    'Publish-CIArtifact'
)
