[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"
$source = $PSScriptRoot
$target = Join-Path $env:APPDATA "Zed"
$timestamp = Get-Date -Format "yyyyMMdd-HHmmss"
$backup = Join-Path $target "backups\portable-install-$timestamp"
$utf8 = New-Object System.Text.UTF8Encoding($false)

New-Item -ItemType Directory -Force -Path $target, $backup, (Join-Path $target "scripts") | Out-Null

foreach ($name in @("settings.json", "keymap.json", "tasks.json")) {
  $existing = Join-Path $target $name
  if (Test-Path -LiteralPath $existing) {
    Copy-Item -LiteralPath $existing -Destination (Join-Path $backup $name)
  }
}

Copy-Item -LiteralPath (Join-Path $source "settings.json") -Destination (Join-Path $target "settings.json") -Force
Copy-Item -LiteralPath (Join-Path $source "keymap.json") -Destination (Join-Path $target "keymap.json") -Force
Copy-Item -LiteralPath (Join-Path $source "scripts\toggle-file-scan-exclusions.mjs") -Destination (Join-Path $target "scripts\toggle-file-scan-exclusions.mjs") -Force
Copy-Item -LiteralPath (Join-Path $source "scripts\file-exclusions.json") -Destination (Join-Path $target "scripts\file-exclusions.json") -Force
Copy-Item -LiteralPath (Join-Path $source "scripts\zed-settings-sync.mjs") -Destination (Join-Path $target "scripts\zed-settings-sync.mjs") -Force
$syncConfig = Join-Path $target "scripts\settings-sync.json"
if (-not (Test-Path -LiteralPath $syncConfig)) {
  Copy-Item -LiteralPath (Join-Path $source "scripts\settings-sync.json") -Destination $syncConfig
} else {
  $existingState = Get-Content -LiteralPath $syncConfig -Raw | ConvertFrom-Json
  $migratedState = [ordered]@{
    gist_id = if ($existingState.gist_id -is [string]) { $existingState.gist_id } else { "" }
    last_synced_hash = if ($existingState.last_synced_hash -is [string]) { $existingState.last_synced_hash } else { "" }
    auto_sync = $existingState.auto_sync -eq $true
    interval_minutes = if ($existingState.interval_minutes -is [int] -and $existingState.interval_minutes -ge 5) { $existingState.interval_minutes } else { 15 }
    last_run_at = if ($existingState.last_run_at -is [string]) { $existingState.last_run_at } else { "" }
    last_result = if ($existingState.last_result -is [string]) { $existingState.last_result } else { "" }
  } | ConvertTo-Json
  [IO.File]::WriteAllText($syncConfig, "$migratedState`n", $utf8)
}

$toggleScriptPath = (Join-Path $target "scripts\toggle-file-scan-exclusions.mjs").Replace("\", "/")
$syncScriptPath = (Join-Path $target "scripts\zed-settings-sync.mjs").Replace("\", "/")
$tasks = [IO.File]::ReadAllText((Join-Path $source "tasks.json"))
$tasks = $tasks.Replace("__TOGGLE_SCRIPT__", $toggleScriptPath)
$tasks = $tasks.Replace("__SYNC_SCRIPT__", $syncScriptPath)
[IO.File]::WriteAllText((Join-Path $target "tasks.json"), $tasks, $utf8)

Write-Host "Installed Zed configuration to $target"
Write-Host "Previous configuration backed up to $backup"