#!/usr/bin/env pwsh
# Setup implementation plan for a feature

[CmdletBinding()]
param(
    [switch]$Json,
    [switch]$Help
)

$ErrorActionPreference = 'Stop'

# Show help if requested
if ($Help) {
    Write-Output "Usage: ./setup-plan.ps1 [-Json] [-Help]"
    Write-Output "  -Json     Output results in JSON format"
    Write-Output "  -Help     Show this help message"
    exit 0
}

# Load common functions
. "$PSScriptRoot/common.ps1"

# Get all paths and variables from common functions
$paths = Get-FeaturePathsEnv

# Ensure the feature directory exists
New-Item -ItemType Directory -Path $paths.FEATURE_DIR -Force | Out-Null

# Copy plan template if plan doesn't already exist
if (Test-Path $paths.IMPL_PLAN -PathType Leaf) {
    if ($Json) {
        [Console]::Error.WriteLine("Plan already exists at $($paths.IMPL_PLAN), skipping template copy")
    } else {
        Write-Output "Plan already exists at $($paths.IMPL_PLAN), skipping template copy"
    }
} else {
    $template = Resolve-Template -TemplateName 'plan-template' -RepoRoot $paths.REPO_ROOT
    if ($template -and (Test-Path $template)) {
        # Read the template content and write it to the implementation plan file with UTF-8 encoding without BOM
        $content = [System.IO.File]::ReadAllText($template)
        $utf8NoBom = New-Object System.Text.UTF8Encoding($false)
        [System.IO.File]::WriteAllText($paths.IMPL_PLAN, $content, $utf8NoBom)
        # Emit the copy status like the bash twin (setup-plan.sh); route to stderr
        # in -Json mode so stdout stays pure JSON, matching the sibling messages.
        if ($Json) {
            [Console]::Error.WriteLine("Copied plan template to $($paths.IMPL_PLAN)")
        } else {
            Write-Output "Copied plan template to $($paths.IMPL_PLAN)"
        }
    } else {
        # Match the bash twin's wording and stream routing (stderr in -Json so
        # stdout stays pure JSON, stdout otherwise), consistent with the sibling
        # "Copied plan template" message above.
        if ($Json) {
            [Console]::Error.WriteLine("Warning: Plan template not found")
        } else {
            Write-Output "Warning: Plan template not found"
        }
        # Create a basic plan file if template doesn't exist
        New-Item -ItemType File -Path $paths.IMPL_PLAN -Force | Out-Null
    }
}

# Output results
if ($Json) {
    $result = [PSCustomObject]@{
        FEATURE_SPEC = $paths.FEATURE_SPEC
        IMPL_PLAN = $paths.IMPL_PLAN
        SPECS_DIR = $paths.FEATURE_DIR
        BRANCH = $paths.CURRENT_BRANCH
    }
    $result | ConvertTo-Json -Compress
} else {
    Write-Output "FEATURE_SPEC: $($paths.FEATURE_SPEC)"
    Write-Output "IMPL_PLAN: $($paths.IMPL_PLAN)"
    Write-Output "SPECS_DIR: $($paths.FEATURE_DIR)"
    Write-Output "BRANCH: $($paths.CURRENT_BRANCH)"
}
