# Interactive: write local author profile (not a secret).
# Run in the user's own terminal, not in an agent session.

param(
    [string]$UserName,
    [string]$UserEmail,
    [string]$GitUsername,
    [string]$SshKeyPath
)

$ErrorActionPreference = 'Stop'
. (Join-Path $PSScriptRoot 'common.ps1')

$defaults = Get-GitSkillsDefaults

function Read-DefaultPrompt {
    param(
        [string]$Label,
        [string]$Default
    )
    if ([string]::IsNullOrWhiteSpace($Default)) {
        $value = Read-Host $Label
        return $value.Trim()
    }
    $value = Read-Host "$Label [$Default]"
    if ([string]::IsNullOrWhiteSpace($value)) {
        return $Default
    }
    return $value.Trim()
}

$existing = Get-GitSkillsProfile
# Do not assign to $profile - that is a PowerShell automatic variable.

if (-not $PSBoundParameters.ContainsKey('UserName') -or [string]::IsNullOrWhiteSpace($UserName)) {
    $fallback = if ($existing) { $existing.userName } else { $defaults.userName }
    $UserName = Read-DefaultPrompt -Label 'Git user.name' -Default $fallback
}
if (-not $PSBoundParameters.ContainsKey('UserEmail') -or [string]::IsNullOrWhiteSpace($UserEmail)) {
    $fallback = if ($existing) { $existing.userEmail } else { $defaults.userEmail }
    $UserEmail = Read-DefaultPrompt -Label 'Git user.email' -Default $fallback
}
if (-not $PSBoundParameters.ContainsKey('GitUsername') -or [string]::IsNullOrWhiteSpace($GitUsername)) {
    $fallback = if ($existing) { $existing.gitUsername } else { '' }
    $GitUsername = Read-DefaultPrompt -Label 'Gitea username (HTTPS login name, not the token)' -Default $fallback
}
if (-not $PSBoundParameters.ContainsKey('SshKeyPath') -or [string]::IsNullOrWhiteSpace($SshKeyPath)) {
    $fallback = if ($existing -and $existing.sshKeyPath) {
        $existing.sshKeyPath
    } else {
        Join-Path $env:USERPROFILE '.ssh\id_ed25519'
    }
    $SshKeyPath = Read-DefaultPrompt -Label 'SSH private key path' -Default $fallback
}

$coAuthors = @()
if ($existing -and $existing.PSObject.Properties.Name -contains 'coAuthors' -and $null -ne $existing.coAuthors) {
    $coAuthors = @($existing.coAuthors)
}
$extraCo = ''
if (-not [Console]::IsInputRedirected) {
    $extraCo = Read-DefaultPrompt -Label 'Extra Co-authored-by as Name <email> (empty keeps current list)' -Default ''
}
if ($extraCo -match '^\s*(.+?)\s*<([^>]+)>\s*$') {
    $entry = [pscustomobject]@{
        name  = $Matches[1].Trim()
        email = $Matches[2].Trim()
    }
    $dup = $false
    foreach ($c in $coAuthors) {
        if (([string]$c.name) -eq $entry.name -and ([string]$c.email) -eq $entry.email) {
            $dup = $true
            break
        }
    }
    if (-not $dup) {
        $coAuthors += $entry
    }
}

if ([string]::IsNullOrWhiteSpace($UserName)) { throw 'user.name is required.' }
if ([string]::IsNullOrWhiteSpace($UserEmail)) { throw 'user.email is required.' }
if ([string]::IsNullOrWhiteSpace($GitUsername)) { throw 'HTTPS Git username is required.' }

$profileObj = [pscustomobject]@{
    userName     = $UserName
    userEmail    = $UserEmail
    gitUsername  = $GitUsername
    sshKeyPath   = $SshKeyPath
    coAuthors    = @($coAuthors)
    updatedAtUtc = [DateTime]::UtcNow.ToString('o')
}

Save-GitSkillsProfile -Profile $profileObj

Write-StatusLine -Key 'status' -Value 'saved'
Write-StatusLine -Key 'path' -Value $script:ProfilePath
Write-StatusLine -Key 'userName' -Value $UserName
Write-StatusLine -Key 'userEmail' -Value $UserEmail
Write-StatusLine -Key 'gitUsername' -Value $GitUsername
Write-StatusLine -Key 'sshKeyPath' -Value $SshKeyPath
$trailers = Get-CoAuthorTrailerLines -GitProfile $profileObj
Write-StatusLine -Key 'co_authored_by_count' -Value "$($trailers.Count)"
foreach ($line in $trailers) {
    Write-StatusLine -Key 'co_authored_by' -Value $line
}