#Requires -Version 5.1
<#
.SYNOPSIS
    Installs tmux (terminal multiplexer) and deploys .tmux.conf.

.DESCRIPTION
    Installs tmux via winget (arndawg.tmux-windows) and deploys a
    customized .tmux.conf to the current user's home directory.

    Supported platforms:
      - Windows x64 (AMD64 / Intel 64bit)
      - Windows ARM64

    Prerequisites:
      - winget (Windows Package Manager) — built into Windows 10 1709+

.EXAMPLE
    .\install-tmux.ps1

    # One-liner install from remote:
    powershell -ExecutionPolicy Bypass -c "$t=\"$env:TEMP\install-tmux.ps1\"; iwr -useb 'https://gl.isitsoft.kr/publicproj/install-sh/-/raw/main/install-tmux.ps1' -OutFile $t; & $t"

.NOTES
    If execution policy error occurs:
      Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
#>

[CmdletBinding()]
param()

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

# ────────────────────────────────────────────
# Utility functions
# ────────────────────────────────────────────
function Info    { Write-Host "[INFO]  $args" -ForegroundColor Cyan }
function Warn    { Write-Host "[WARN]  $args" -ForegroundColor Yellow }
function Success { Write-Host "[OK]    $args" -ForegroundColor Green }
function ErrExit { Write-Host "[ERROR] $args" -ForegroundColor Red; exit 1 }

# ────────────────────────────────────────────
# Constants
# ────────────────────────────────────────────
$ConfFile = Join-Path $env:USERPROFILE '.tmux.conf'

# ────────────────────────────────────────────
# Step 1: Install tmux
# ────────────────────────────────────────────
Info "Installing tmux..."

$tmuxCmd = Get-Command tmux -ErrorAction SilentlyContinue
if ($tmuxCmd) {
    $currentVer = & tmux -V 2>$null
    if (-not $currentVer) { $currentVer = "unknown" }
    Info "tmux is already installed ($currentVer). Skipping installation."
} else {
    if (-not (Get-Command winget -ErrorAction SilentlyContinue)) {
        ErrExit "winget is required. Install it from the Microsoft Store or https://learn.microsoft.com/en-us/windows/package-manager/winget/"
    }

    winget install --id arndawg.tmux-windows --accept-package-agreements --accept-source-agreements 2>&1 | Out-Null
    Success "tmux installed via winget"
}

# ────────────────────────────────────────────
# Verify tmux is available and add to PATH permanently if needed
# ────────────────────────────────────────────
$tmuxBin = $null

# 1) Try current PATH
$tmuxCmd = Get-Command tmux -ErrorAction SilentlyContinue
if ($tmuxCmd) {
    $tmuxBin = $tmuxCmd.Source
}

# 2) Refresh PATH from registry (winget may have added paths)
if (-not $tmuxBin) {
    $env:Path = [System.Environment]::GetEnvironmentVariable('Path', 'User') + ';' + [System.Environment]::GetEnvironmentVariable('Path', 'Machine')
    $tmuxCmd = Get-Command tmux -ErrorAction SilentlyContinue
    if ($tmuxCmd) {
        $tmuxBin = $tmuxCmd.Source
    }
}

# 3) Search common locations where winget installs tmux-windows
if (-not $tmuxBin) {
    $searchDirs = @(
        (Join-Path $env:LOCALAPPDATA 'Microsoft\WinGet\Links'),
        (Join-Path $env:LOCALAPPDATA 'Programs\tmux-windows'),
        'C:\Program Files\tmux-windows',
        'C:\Program Files (x86)\tmux-windows'
    )
    foreach ($dir in $searchDirs) {
        if (Test-Path $dir) {
            $candidate = Join-Path $dir 'tmux.exe'
            if (Test-Path $candidate) { $tmuxBin = $candidate; break }
        }
    }

    # Recurse under WinGet/Packages for tmux
    if (-not $tmuxBin -and (Test-Path (Join-Path $env:LOCALAPPDATA 'Microsoft\WinGet\Packages'))) {
        $found = Get-ChildItem -Path (Join-Path $env:LOCALAPPDATA 'Microsoft\WinGet\Packages') -Recurse -Filter 'tmux.exe' -ErrorAction SilentlyContinue | Select-Object -First 1
        if ($found) { $tmuxBin = $found.FullName }
    }
}

if ($tmuxBin) {
    # Add tmux's directory to PATH for this session
    $tmuxDir = Split-Path $tmuxBin
    if ($env:Path -notlike "*$tmuxDir*") {
        $env:Path = "$tmuxDir;$env:Path"
        Info "Added $tmuxDir to PATH for this session"
    }
    Success "tmux is available: $tmuxBin"

    # Permanently add tmux's directory to user PATH if not already there
    $userPath = [System.Environment]::GetEnvironmentVariable('Path', 'User')
    if ($userPath -notlike "*$tmuxDir*") {
        [System.Environment]::SetEnvironmentVariable('Path', "$tmuxDir;$userPath", 'User')
        Success "Added $tmuxDir to user PATH permanently (takes effect on next login)"
    } else {
        Info "$tmuxDir already in user PATH"
    }
} else {
    Warn "tmux was not found in PATH after installation."
    Warn "Please restart your terminal or add tmux's directory to your PATH manually."
}

# ────────────────────────────────────────────
# Step 2: Deploy .tmux.conf
# ────────────────────────────────────────────
if (Test-Path $ConfFile) {
    $timestamp = Get-Date -Format 'yyyyMMddHHmmss'
    $backup = "${ConfFile}.bak.${timestamp}"
    Copy-Item $ConfFile $backup
    Warn "Existing .tmux.conf found at $ConfFile"
    Info "Backup saved to $backup"
}

$tmuxConf = @'
# .tmux.conf - tmux-windows compatible
#
# Based on: https://github.com/arndawg/tmux-windows/blob/master/example_tmux.conf

# Prefix key (default is Ctrl-b, changed to Ctrl-a)
set -g prefix C-a
unbind C-b
bind C-a send-prefix

# Terminal settings (important for Windows compatibility)
set -g default-terminal "tmux-256color"
set-option -sa terminal-features ",xterm*:RGB"

# No bells
set -g bell-action none

# Split panes with current path
bind | split-window -h -c "#{pane_current_path}"
bind - split-window -v -c "#{pane_current_path}"
unbind '"'
unbind %

# Pane navigation (vim-style)
bind h select-pane -L
bind j select-pane -D
bind k select-pane -U
bind l select-pane -R

# Window navigation
bind -r C-h previous-window
bind -r C-l next-window

# Layout
bind Space next-layout
bind o rotate-window

# Window management
bind , command-prompt "rename-window %%"
bind & kill-window

# Reload config
bind r source-file ~/.tmux.conf \; display "Reloaded!"

# Status bar
set -g status-bg colour235
set -g status-fg colour136
set -g status-left-length 40
set -g status-right-length 40
set -g status-interval 5
set -g history-limit 10000

set -g status-left '#[fg=green]#S #[fg=yellow]#H'
set -g status-right '#[fg=cyan]%Y-%m-%d #[fg=green]%H:%M:%S'

# Pane border colors
set-option -g pane-border-style 'fg=colour244'
set-option -g pane-active-border-style 'fg=colour77'

# Copy mode with vi keys
setw -g mode-keys vi

# Mouse support (without copy mode dragging)
set -g mouse on
unbind -n MouseDrag1Pane
unbind -Tcopy-mode MouseDrag1Pane

# for pi
set -g extended-keys on
set -g extended-keys-format csi-u
'@

[System.IO.File]::WriteAllText($ConfFile, $tmuxConf, [System.Text.UTF8Encoding]::new($false))
Success ".tmux.conf deployed to $ConfFile"

# ────────────────────────────────────────────
# Step 3: Post-install notes
# ────────────────────────────────────────────
Info ""
Info "=================================================="
Success "tmux installation complete!"
Info "=================================================="
if ($tmuxBin) {
    Info ""
    Info "tmux binary: $tmuxBin"
}
Info ""
Info "IMPORTANT: Close this terminal and open a new one to use tmux."
Info "PATH changes require a new terminal session to take effect."
Info ""
Info "RECOMMENDED: On Windows 10, use Windows Terminal instead of CMD.exe."
Info "Install it from: winget install Microsoft.WindowsTerminal"
Info "Windows Terminal supports true color, Unicode, and tmux panes properly."
Info ""
Info "Getting started:"
Info "  tmux                    - Start a new session"
Info "  tmux new -s <name>      - Start a named session"
Info "  tmux attach -t <name>   - Attach to a session"
Info "  tmux ls                 - List sessions"
Info ""
Info "Key bindings (customized via .tmux.conf):"
Info "  Ctrl-a |        - Split horizontally"
Info "  Ctrl-a -        - Split vertically"
Info "  Ctrl-a h/j/k/l  - Navigate panes (vim-style)"
Info "  Ctrl-a r         - Reload .tmux.conf"
Info ""
Info "Config file: $ConfFile"