#region Config & Task Definitions

# Listening port for HTTP UI
$Port = 8082

# Define every task once here:
#  Id        → checkbox HTML `id`
#  Name      → URL path (`/Name`)
#  Label     → user-visible text
#  HandlerFn → the PowerShell function to invoke
#  Page      → which tab/page it appears on

$Global:Tasks = @(
      # On-Boarding, left column
      @{ Id='setSVSPowerplan';     Name='setSVSPowerplan';     Label='Set SVS Powerplan';    HandlerFn='Set-SVSPowerPlan';      Page='onboard'; Column='left' },
      @{ Id='installSVSMSPModule'; Name='installSVSMSPModule'; Label='Install SVSMSP Module'; HandlerFn='Install-SVSMSPModule'; Page='onboard'; Column='left' },
      @{ Id='installCyberQP';      Name='installCyberQP';      Label='Install CyberQP';       HandlerFn='Install-CyberQP';      Page='onboard'; Column='left' },
      @{ Id='installSplashtop';    Name='installSplashtop';    Label='Install Splashtop';     HandlerFn='Install-Splashtop';    Page='onboard'; Column='left' },
      @{ Id='installSVSHelpDesk';  Name='installSVSHelpDesk';  Label='Install SVS HelpDesk';  HandlerFn='Install-SVSHelpDesk';  Page='onboard'; Column='left' },
      @{ Id='installThreatLocker'; Name='installThreatLocker'; Label='Install ThreatLocker';  HandlerFn='Install-ThreatLocker'; Page='onboard'; Column='left' },
      @{ Id='installRocketCyber';  Name='installRocketCyber';  Label='Install RocketCyber';   HandlerFn='Install-RocketCyber';  Page='onboard'; Column='left' },
      @{ Id='installDattoRMM';     Name='installDattoRMM';     Label='Install DattoRMM';      HandlerFn='Handle-InstallRMM';    Page='onboard'; Column='left'; 
          SubOptions= @(
            @{ Value='inputVar'; Label='Copy Site Variables' },
            @{ Value='rmm';      Label='Install DRMM Agent'   },
            @{ Value='exe';      Label='Download .exe'        }
          ) 
      },


      # On-Boarding, right column (optional bits)
      @{ Id='enableBitLocker';     Name='EnableBitLocker';     Label='Enable BitLocker';       HandlerFn='Set-SVSBitLocker';  Page='onboard'; Column='right' },
      @{ Id='setEdgeDefaultSearch';Name='setedgedefaultsearch';Label='Set Edge Default Search';HandlerFn='set-EdgeDefaultSearchProvider';Page='onboard'; Column='right' },
 
    # Off-Boarding
    @{ Id='uninstallCyberQP';     Name='uninstallCyberQP';     Label='Uninstall CyberQP';        HandlerFn='Uninstall-CyberQP';     Page='offboard' },
    @{ Id='uninstallSVSMSPModule';Name='uninstallSVSMSPModule';Label='Uninstall SVSMSP Module';  HandlerFn='Cleanup-SVSMSP';        Page='offboard' },

    # Tweaks
    @{ Id='disableAnimations';     Name='disableAnimations';     Label='Disable Animations';       HandlerFn='Disable-Animations';    Page='tweaks' },

    # SVS Apps
    @{ Id='wingetLastpass';        Name='wingetLastpass';        Label='LastPass Desktop App';     HandlerFn='Install-WingetLastPass'; Page='SVSApps' }
)

#endregion

#region Logging Helpers

# Initialize a global in-memory log cache
if (-not $Global:LogCache -or -not ($Global:LogCache -is [System.Collections.ArrayList])) {
    $Global:LogCache = [System.Collections.ArrayList]::new()
}

# Core Write-Log function (advanced with event-log support)
function Write-LogHelper {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory)][string]$Message,
        [ValidateSet("Info","Warning","Error","Success","General")]
        [string]$Level = "Info",
        [string]$TaskCategory = "GeneralTask",
        [switch]$LogToEvent,
        [string]$EventSource    = "SVSMSP_Module",
        [string]$EventLog       = "Application",
        [int]$CustomEventID
    )
    $EventID = @{ Info=1000; Warning=2000; Error=3000; Success=4000; General=1000 }[$Level]
    $Icon    = @{ Info="📝"; Warning="⚠️"; Error="❌"; Success="✅"; General="📦" }[$Level]
    $logEntry = [PSCustomObject]@{
        Timestamp = (Get-Date).ToString("yyyy-MM-dd HH:mm:ss")
        Level     = $Level
        Message   = "$Icon [$Level] [$TaskCategory] $Message (EventID:$EventID)"
    }
    [void]$Global:LogCache.Add($logEntry)

    if ($LogToEvent) {
        try {
            if (-not (Get-EventLog -LogName $EventLog -Source $EventSource -ErrorAction SilentlyContinue)) {
                New-EventLog -LogName $EventLog -Source $EventSource -ErrorAction SilentlyContinue
            }
            Write-EventLog -LogName $EventLog -Source $EventSource `
                -EntryType $Level -EventId $EventID `
                -Message $Message
        } catch {
            Write-Host "⚠️ [EventLog] Failed to write: $($_.Exception.Message)" -ForegroundColor Yellow
        }
    }
}

# Hybrid wrapper: uses your module's Write-Log if available, else falls back
if (Get-Command Write-Log -ErrorAction SilentlyContinue) {
    function Write-LogHybrid { param($Message,$Level,$TaskCategory,$LogToEvent) Write-Log @PSBoundParameters }
} else {
    function Write-LogHybrid { param($Message,$Level,$TaskCategory,$LogToEvent) Write-LogHelper @PSBoundParameters }
}

#endregion

#region Handler Stubs

function Respond-Text {
    param($Context, $Text)
    $bytes = [Text.Encoding]::UTF8.GetBytes($Text)
    $Context.Response.ContentType     = 'text/plain'
    $Context.Response.ContentLength64 = $bytes.Length
    $Context.Response.OutputStream.Write($bytes,0,$bytes.Length)
    $Context.Response.OutputStream.Close()
}

function Respond-HTML {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true)][object] $Context,
        [Parameter(Mandatory = $true)][string] $Html
    )
    $bytes = [Text.Encoding]::UTF8.GetBytes($Html)
    $Context.Response.ContentType     = 'text/html'
    $Context.Response.ContentLength64 = $bytes.Length
    $Context.Response.OutputStream.Write($bytes, 0, $bytes.Length)
    $Context.Response.OutputStream.Close()
}

# new helper to return JSON
function Respond-JSON {
    param($Context, $Object)
    $json = $Object | ConvertTo-Json -Depth 5
    $bytes = [Text.Encoding]::UTF8.GetBytes($json)
    $Context.Response.ContentType     = 'application/json'
    $Context.Response.ContentLength64 = $bytes.Length
    $Context.Response.OutputStream.Write($bytes,0,$bytes.Length)
    $Context.Response.OutputStream.Close()
}

#region Install-DattoRMM-Helper
function Install-DattoRMM-Helper {
    param (
        [string]$ApiUrl,
        [string]$ApiKey,
        [string]$ApiSecretKey,
        [switch]$FetchSitesOnly,
        [string]$SiteName,
        [string]$SiteUID
    )
    if (-not $ApiUrl -or -not $ApiKey -or -not $ApiSecretKey) {
        Write-LogHybrid -Message "Missing required parameters. Please provide ApiUrl, ApiKey, and ApiSecretKey." -Level "Error" -LogToEvent
        return
    }
    [Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
    Write-LogHybrid -Message "Fetching OAuth token..." -Level "Info"
    try {
        $securePassword = ConvertTo-SecureString -String 'public' -AsPlainText -Force
        $apiGenToken = Invoke-WebRequest -Credential (New-Object -TypeName System.Management.Automation.PSCredential -ArgumentList ('public-client', $securePassword)) `
            -Uri ('{0}/auth/oauth/token' -f $ApiUrl) `
            -Method 'POST' `
            -ContentType 'application/x-www-form-urlencoded' `
            -Body ('grant_type=password&username={0}&password={1}' -f $ApiKey, $ApiSecretKey) `
            | ConvertFrom-Json
        $requestToken = $apiGenToken.access_token
        Write-LogHybrid -Message "OAuth token fetched successfully." -Level "Success" -LogToEvent
    } catch {
        Write-LogHybrid -Message "Failed to fetch OAuth token. Details: $($_.Exception.Message)" -Level "Error" -LogToEvent
        return
    }
    $getHeaders = @{"Authorization" = "Bearer $requestToken"}
    if ($FetchSitesOnly) {
        Write-Host "Fetching list of sites from the Datto RMM API..." -ForegroundColor Cyan
        try {
            $getHeaders = @{"Authorization" = "Bearer $requestToken" }
            $getSites = Invoke-WebRequest -Uri "$ApiUrl/api/v2/account/sites" -Method Get -Headers $getHeaders -ContentType "application/json"
            $sitesJson = $getSites.Content | ConvertFrom-Json
            $siteList = $sitesJson.sites | ForEach-Object {
                [PSCustomObject]@{
                    Name = $_.name
                    UID  = $_.uid
                }
            }
            Write-Host "Successfully fetched list of sites." -ForegroundColor Green
            return $siteList
        }
        catch {
            Write-Host "Failed to fetch sites from the API. Details: $($_.Exception.Message)" -ForegroundColor Red
            return
        }
    }
}
#endregion

# POST /getpw → read JSON body, call helper, return JSON
function Handle-FetchSites {
    param($Context)
     Write-Host "[Debug] Handle-FetchSites invoked"   # ← add this
    try {
        $body = (New-Object IO.StreamReader $Context.Request.InputStream).ReadToEnd() 
        $pw   = (ConvertFrom-Json $body).password
        $sites = Install-DattoRMM-Helper `
                  -ApiUrl $ApiUrl `
                  -ApiKey $ApiKey `
                  -ApiSecretKey $ApiSecretKey `
                  -FetchSitesOnly
        if (-not $sites) { $Context.Response.StatusCode = 500; $sites = @() }
        $json = $sites | ConvertTo-Json -Depth 2
        $bytes = [Text.Encoding]::UTF8.GetBytes($json)
        $Context.Response.ContentType = 'application/json'
        $Context.Response.OutputStream.Write($bytes,0,$bytes.Length)
    } catch {
        $Context.Response.StatusCode = 500
        $Context.Response.ContentType = 'application/json'
        $Context.Response.OutputStream.Write([Text.Encoding]::UTF8.GetBytes('[]'),0,2)
    } finally {
        $Context.Response.OutputStream.Close()
    }
}


# On-boarding handlers
function Set-SVSPowerPlan {
    param($Context)
    Write-LogHybrid "PowerPlan set" "Success" "OnBoard"
    Respond-Text $Context "Powerplan applied"
}
function Install-SVSMSPModule {
    param($Context)
    Write-LogHybrid "SVSMSP Module installed" "Success" "OnBoard"
    Respond-Text $Context "SVSMSP Module installed"
}
function Install-CyberQP {
    param($Context)
    Write-LogHybrid "CyberQP installed" "Success" "OnBoard"
    Respond-Text $Context "CyberQP installed"
}

# Off-boarding handlers
function Uninstall-CyberQP {
    param($Context)
    Write-LogHybrid "CyberQP uninstalled" "Success" "OffBoard"
    Respond-Text $Context "CyberQP uninstalled"
}
function Cleanup-SVSMSP {
    param($Context)
    Write-LogHybrid "SVSMSP cleaned up" "Success" "OffBoard"
    Respond-Text $Context "SVSMSP cleaned up"
}

# Tweaks handler
function Disable-Animations {
    param($Context)
    Write-LogHybrid "Animations disabled" "Success" "Tweaks"
    Respond-Text $Context "Animations disabled"
}

# SVSApps handler
function Install-WingetLastPass {
    param($Context)
    Write-LogHybrid "Winget LastPass installed" "Success" "SVSApps"
    Respond-Text $Context "Winget LastPass installed"
}

#endregion

#region UI Generation

function Build-Checkboxes {
  param($Page, $Column)

  (
    $Global:Tasks |
      Where-Object Page  -EQ $Page   |
      Where-Object Column -EQ $Column |
      ForEach-Object {
        # 1) render the main checkbox
        $html = "<label><input type='checkbox' id='$($_.Id)' name='$($_.Name)' data-column='$Column'> $($_.Label)</label>"

        # 2) if this task has SubOptions, render them in a hidden container
        if ($_.SubOptions) {

          Write-Host "👉 Rendering SubOptions for task $($_.Id)"

          $subHtml = (
            $_.SubOptions | ForEach-Object {
              "<label style='margin-left:20px; display:block;'>
                 <input type='checkbox' name='$($_.Value)' value='$($_.Value)'> $($_.Label)
               </label>"
            }
          ) -join "`n"

          $html += @"
<div id='${($_.Id)}OptionsContainer' style='display:none; margin-top:4px;'>
$subHtml
</div>
"@
        }

        $html
      }
  ) -join "`n"
}



function Get-UIHtml {
    param([string]$Page = 'onboard')

    #
    # 1) Inline your full original CSS here
    #
$style = @'
<style>
    :root {
      /* Cool Palette */
      --background-color: rgba(18, 18, 18, 1);
      --border-color: rgba(255,127,0,0.25);
      /* Neutral Colors */
      --white-color: rgba(255,255,255);
      --gray-color: rgba(102,102,102);
      --dark-gray-color: rgba(51,51,51);
      --light-gray-color: rgba(187,187,187);
      /* Sidebar Button Colors */
      --btn-sidebar-light-gray: rgba(68,68,68);
      --btn-sidebar-blue: rgba(30,144,255,1);
      --btn-hover: rgba(0,86,179,1);
      --btn-hover-scale: 1.05;
      /* Button Colors */
      --btn-success: rgba(40,167,69);
      --btn-success-disabled: rgba(108,117,125);
      --btn-danger: rgba(220,53,69);
    }

    body {
      font-family: Arial, sans-serif;
      margin: 0; padding: 0;
      background-color: var(--background-color);
      color: var(--white-color);
      height: 100%; overflow: hidden;
    }

    .logo-container { text-align:left; padding:20px; }
    .logo-container img { max-width:300px; height:auto; }
    .subtitle { font-size: 1.2rem; color: var(--gray-color); margin-top: 0.5em; }

    .container { display:flex; height:100vh; overflow:hidden; }
    .sidebar { width:200px; background:var(--background-color); padding:10px; }
    .sidebar button {
      display:block; width:100%; margin-bottom:10px; padding:10px;
      color:var(--white-color); background:var(--btn-sidebar-light-gray);
      border:none; border-radius:5px; cursor:pointer; text-align:left;
      transition:background-color 0.3s, transform 0.2s;
    }
    .sidebar button.active { background:var(--btn-sidebar-blue); }
    .sidebar button:hover {
      background:var(--btn-hover); transform:scale(var(--btn-hover-scale));
    }

    .content {
      position: relative; 
      flex:1; 
      padding:20px; 
      overflow-y:auto;
      max-height:calc(100vh - 50px);
    }

    .fixed-buttons {
      position: fixed;
      bottom: 20px;
      right: 20px;
      display: flex;
      gap: 10px;        /* space between Exit and Run */
      z-index: 1000;
    }

    .exit-button,
    .run-button {
      border: none;
      border-radius: 5px;
      padding: 10px 20px;
      cursor: pointer;
      color: var(--white-color);
    }

    .exit-button {
      background-color: var(--btn-danger);
    }

    .run-button {
      background-color: var(--btn-success);
    }



    .tab-content { display:none; }
    .tab-content.active { display:block; }

    .columns-container {
      display:flex; gap:20px; flex-wrap:wrap; align-items:flex-start;
    }
   
    /* column styling, same as old script */
    .column {
      flex: 1;                          /* fill available space */
      max-width: 45%;                   /* or whatever width you like */
      border: 2px solid var(--border-color);
      border-radius: 8px;
      padding: 10px;
      background-color: var(--dark-gray-color);
      box-shadow: 0 4px 6px rgba(0,0,0,0.3);
    }
    .checkbox-group label {
      display:flex; align-items:center; margin-bottom:8px;
    }

    .button-group { text-align:right; margin-top:20px; }
    .exit-button {
      background:var(--btn-danger); color:var(--white-color);
      padding:10px 20px; border:none; border-radius:5px; cursor:pointer;
    }

    @media (max-width:768px) {
      .container { flex-direction:column; }
      .sidebar { width:100%; }
    }
</style>
'@

    $script = @'
    <script>
      // =======================================================================
      // Tab Navigation
      // =======================================================================
      const tabButtons  = document.querySelectorAll(".tab-button");
      const tabContents = document.querySelectorAll(".tab-content");
      tabButtons.forEach(btn => {
          btn.addEventListener("click", () => {
              // clear active state
              tabButtons.forEach(b => b.classList.remove("active"));
              tabContents.forEach(c => c.classList.remove("active"));
              // set new active
              btn.classList.add("active");
              document.getElementById(btn.dataset.tab).classList.add("active");
          });
      });
      // initialize default tab on load
      document.querySelector(".tab-button[data-tab='{{defaultPage}}Tab']").classList.add("active");
      document.getElementById("{{defaultPage}}Tab").classList.add("active");

      // =======================================================================
      // Task Trigger
      // =======================================================================
      const tasks = [
    {{tasksJsAll}}
      ];

       // =======================================================================
       // Column “Select All” toggling for On-Boarding
       // =======================================================================
       function toggleColumn(col) {
       const master = document.getElementById(
        `selectAll${col[0].toUpperCase() + col.slice(1)}Checkbox`
      );
      document
        .querySelectorAll(
          `#onboardTab input[type=checkbox][data-column=${col}]`
        )
        .forEach(cb => (cb.checked = master.checked));
    }

        // =======================================================================
        // Un-check “Select All” if any child is unchecked (& re-check if all are checked)
        // =======================================================================
        function updateSelectAll(col) {
          const master = document.getElementById(
            `selectAll${col[0].toUpperCase() + col.slice(1)}Checkbox`
          );
          const children = document.querySelectorAll(
            `#onboardTab input[type=checkbox][data-column=${col}]`
          );
          master.checked = Array.from(children).every(cb => cb.checked);
        }

        // Attach listeners on load
        ['left','right'].forEach(col => {
          document
            .querySelectorAll(`#onboardTab input[type=checkbox][data-column=${col}]`)
            .forEach(cb => cb.addEventListener('change', () => updateSelectAll(col)));
        });

        // =======================================================================
        // DattoRMM Options
        // =======================================================================
          function toggleDattoRMMOptions() {
            const master    = document.getElementById('installDattoRMM');
            const container = document.getElementById('installDattoRMMOptionsContainer');
            if (!container) return;
            container.style.display = master.checked ? 'block' : 'none';
            container.querySelectorAll('input[type="checkbox"]').forEach(cb => cb.checked = master.checked);
          }

          document.addEventListener('DOMContentLoaded', () => {
            const master = document.getElementById('installDattoRMM');
            if (master) master.addEventListener('change', toggleDattoRMMOptions);
          });


    // =======================================================================
    // Fetch Sites Handler
    // =======================================================================
    async function fetchSites() {
      const pwd = document.getElementById("Password").value;
      if (!pwd) { 
        alert("Please enter the password."); 
        return; 
      }

      const dropdown = document.getElementById("dattoDropdown");
      dropdown.innerHTML = '<option disabled selected>Loading sites...</option>';

      try {
        const resp = await fetch("/getpw", {
          method: "POST",
          headers: { "Content-Type": "application/json" },
          body: JSON.stringify({ password: pwd })
        });

        if (!resp.ok) throw("HTTP " + resp.status);

        const sites = await resp.json();
        dropdown.innerHTML = ''; // clear the loading message

        sites.forEach(site => {
          const option = document.createElement("option");
          option.value = site.UID;
          option.textContent = site.Name;
          dropdown.appendChild(option);
        });

        document.getElementById("dattoRmmContainer").style.display = "block";
      }
      catch (e) {
        console.error(e);
        dropdown.innerHTML = '<option disabled selected>Error loading sites</option>';
        alert("Failed to fetch sites. Check password and try again.");
      }
    }




      async function triggerInstall() {
          for (const t of tasks) {
              const cb = document.getElementById(t.id);
              if (cb && cb.checked) {
                  try {
                      await fetch(t.handler, { method: "GET" });
                  } catch (e) {
                      console.error(`Error running ${t.label}:`, e);
                  }
              }
          }
      }

      // =======================================================================
      // Shutdown Handler
      // =======================================================================
      function endSession() {
          fetch("/quit", { method: "GET" })
            .finally(() => window.close());
      }
    </script>

'@

    #
    # 3) The HTML skeleton with placeholders
    #
$htmlTemplate = @"
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width,initial-scale=1.0">
  <title>SVS TaskGate</title>
  <link rel="icon" href="https://git.svstools.com/syelle/Logo/raw/branch/main/SVS_Favicon.ico">
  $style
</head>
<body>
  <div class="logo-container">
    <img src="https://git.svstools.com/syelle/Logo/raw/branch/main/SVS_logo.svg" alt="SVS Logo">
  </div>
  <div class="container">
    <div class="sidebar">
      <button class="tab-button" data-tab="onboardTab">On-Boarding</button>
      <button class="tab-button" data-tab="offboardTab">Off-Boarding</button>
      <button class="tab-button" data-tab="tweaksTab">Tweaks</button>
      <button class="tab-button" data-tab="SVSAppsTab">SVS APPs</button>
    </div>
    <div class="content">
      <div id="onboardTab" class="tab-content">
        <h2>On-Boarding</h2>
        <h3 class="subtitle">This new deployment method ensures everything is successfully deployed with greater ease!</h3>

        <!-- 1) Dynamic task checkboxes -->
        <div class="columns-container">
            <div class="checkbox-group column">
              <h3>SVSMSP Stack</h3>
              <label><input type="checkbox" id="selectAllLeftCheckbox" onclick="toggleColumn('left')"> Select All</label>
              {{onboardLeftColumn}}
            </div>
            <div class="checkbox-group column">
              <h3>Optional</h3>
              <label><input type="checkbox" id="selectAllRightCheckbox" onclick="toggleColumn('right')"> Select All</label>
              {{onboardRightColumn}}
            </div>
          </div>


       
       <!-- 2) Datto RMM dropdown (populated after fetch) -->
        <div id="dattoRmmContainer" style="display:none; margin-bottom:1em;">
          <label for="dattoDropdown">Select Datto Site:</label>
          <select id="dattoDropdown">
            <option disabled selected hidden>Select a site...</option>
          </select>
        </div>    

      <div id="offboardTab" class="tab-content">
        <h2>Off-Boarding</h2>
        <div class="columns-container">
{{offboardCheckboxes}}
        </div>
       
      </div>
      <div id="tweaksTab" class="tab-content">
        <h2>Tweaks</h2>
        <div class="columns-container">
{{tweaksCheckboxes}}
        </div>
       
      </div>
      <div id="SVSAppsTab" class="tab-content">
        <h2>SVS APPs</h2>
        <div class="columns-container">
{{appsCheckboxes}}
        </div>
       
      </div>
    </div>
  </div>
  $script
  <!-- floating button group -->
  <div class="fixed-buttons">
    <button class="exit-button" onclick="endSession()">Exit</button>
    <button class="run-button"  onclick="triggerInstall()">Run Selected</button>
  </div>
</body>
</html>

"@

    #
    # 4) Build the checkbox HTML and tasks JS from $Global:Tasks
    #

    # On-boarding now has two columns:
    $onboardLeft  = Build-Checkboxes -Page 'onboard' -Column 'left'
    $onboardRight = Build-Checkboxes -Page 'onboard' -Column 'right'

    # Off-boarding, Tweaks, SVSApps stay one-column:
    $offboard     = Build-Checkboxes -Page 'offboard'  -Column ''
    $tweaks       = Build-Checkboxes -Page 'tweaks'    -Column ''
    $apps         = Build-Checkboxes -Page 'SVSApps'   -Column ''

   # Tasks JS array (fixed)
    $tasksJsAll = (
      $Global:Tasks | ForEach-Object {
        "    { id: '$($_.Id)', handler: '/$($_.Name)', label: '$($_.Label)' }"
      }
    ) -join ",`n"
 

    #
    # 5) Inject into template
    #
    $html = $htmlTemplate
    $html = $html.Replace('{{onboardLeftColumn}}',  $onboardLeft)
    $html = $html.Replace('{{onboardRightColumn}}', $onboardRight)
    $html = $html.Replace('{{offboardCheckboxes}}', $offboard)
    $html = $html.Replace('{{tweaksCheckboxes}}',   $tweaks)
    $html = $html.Replace('{{appsCheckboxes}}',     $apps)
    $html = $html.Replace('{{tasksJsAll}}',         $tasksJsAll)
    $html = $html.Replace('{{defaultPage}}',        $Page)


    return $html
}

#endregion




#region HTTP Listener & Routing

# Handle shutdown command
if ($path -eq 'quit') {
    Write-LogHybrid "Shutdown requested" "Info" "Server"
    Respond-Text $Context "Server shutting down."
    # This will break out of the while loop in Start-Server
    $Global:Listener.Stop()
    return
}

# Sends the HTML for a given page or invokes a task handler
function Dispatch-Request {
    param($Context)

    # figure out the path
    $path = $Context.Request.Url.AbsolutePath.TrimStart('/')

    # ---- Shutdown handler ----
    if ($path -eq 'quit') {
        Write-LogHybrid "Shutdown requested" "Info" "Server"
        Respond-Text $Context "Server shutting down."
        # stop the listener loop
        $Global:Listener.Stop()
        return
    }

    # ---- Fetch Sites endpoint ----
    if ($Context.Request.HttpMethod -eq 'POST' -and $path -eq 'getpw') {
        Handle-FetchSites $Context
        return
    }

    # ---- Serve UI pages ----
    if ($path -in @('', 'onboard', 'offboard', 'tweaks', 'SVSApps')) {
        $page = if ($path -eq '') { 'onboard' } else { $path }
        $html = Get-UIHtml -Page $page
        Respond-HTML $Context $html
        return
    }
        
    # ---- Task invocation ----
    $task = $Global:Tasks | Where-Object Name -EQ $path
    if ($task) {
        & $task.HandlerFn $Context
        return
    }

    # ---- 404 ----
    $Context.Response.StatusCode = 404
    Respond-Text $Context '404 - Not Found'
}


# Starts the HTTP listener loop
function Start-Server {
    # make it accessible to Dispatch-Request
    $Global:Listener = [System.Net.HttpListener]::new()
    $Global:Listener.Prefixes.Add("http://localhost:$Port/")
    $Global:Listener.Start()
    Write-Host "Listening on http://localhost:$Port/ ..."

    try {
        while ($Global:Listener.IsListening) {
            $ctx = $Global:Listener.GetContext()
            try {
                Dispatch-Request $ctx
            } catch {
                Write-LogHybrid "Dispatch error: $_" "Error" "Server"
            }
        }
    } finally {
        # once the loop exits, clean up
        $Global:Listener.Close()
        Write-LogHybrid "Listener closed." "Info" "Server"
    }
}


#endregion

# Bootstrap: launch the server
Start-Server