terraform {
  required_providers {
    coder = {
      source = "coder/coder"
    }
  }
}

locals {
  username = data.coder_workspace_owner.me.name
  user_id  = data.coder_workspace_owner.me.id
}

data "coder_provisioner" "me" {}
data "coder_workspace" "me" {}
data "coder_workspace_owner" "me" {}

# 環境變數：GitHub token for Copilot
variable "github_token" {
  description = "GitHub token for Copilot authentication (optional)"
  type        = string
  sensitive   = true
  default     = ""
}

resource "coder_agent" "main" {
  arch           = data.coder_provisioner.me.arch
  os             = "linux"
  startup_script = <<-EOT
    set -e

    # 初始化使用者目錄
    if [ ! -f ~/.init_done ]; then
      cp -rT /etc/skel ~ || true
      touch ~/.init_done
    fi

    # 確保必要目錄存在
    mkdir -p ~/.config ~/.cache ~/.local/share

    # 安裝 VSCode Server extensions（可選）
    # code-server --install-extension github.copilot
    # code-server --install-extension ms-vscode.cpptools
  EOT

  # Git 認證配置
  env = {
    GIT_AUTHOR_NAME      = coalesce(data.coder_workspace_owner.me.full_name, data.coder_workspace_owner.me.name)
    GIT_AUTHOR_EMAIL     = "${data.coder_workspace_owner.me.email}"
    GIT_COMMITTER_NAME   = coalesce(data.coder_workspace_owner.me.full_name, data.coder_workspace_owner.me.name)
    GIT_COMMITTER_EMAIL  = "${data.coder_workspace_owner.me.email}"
    # GitHub Copilot 認證
    GITHUB_TOKEN         = var.github_token != "" ? var.github_token : ""
  }

  # 監控指標
  metadata {
    display_name = "CPU Usage"
    key          = "0_cpu_usage"
    script       = "coder stat cpu"
    interval     = 10
    timeout      = 1
  }

  metadata {
    display_name = "RAM Usage"
    key          = "1_ram_usage"
    script       = "coder stat mem"
    interval     = 10
    timeout      = 1
  }

  metadata {
    display_name = "Home Disk"
    key          = "3_home_disk"
    script       = "coder stat disk --path $${HOME}"
    interval     = 60
    timeout      = 1
  }

  metadata {
    display_name = "CPU Usage (Host)"
    key          = "4_cpu_usage_host"
    script       = "coder stat cpu --host"
    interval     = 10
    timeout      = 1
  }

  metadata {
    display_name = "Memory Usage (Host)"
    key          = "5_mem_usage_host"
    script       = "coder stat mem --host"
    interval     = 10
    timeout      = 1
  }

  metadata {
    display_name = "Load Average (Host)"
    key          = "6_load_host"
    script   = <<EOT
      echo "`cat /proc/loadavg | awk '{ print $1 }'` `nproc`" | awk '{ printf "%0.2f", $1/$2 }'
    EOT
    interval = 60
    timeout  = 1
  }

  metadata {
    display_name = "Swap Usage (Host)"
    key          = "7_swap_host"
    script       = <<EOT
      free -b | awk '/^Swap/ { printf("%.1f/%.1f", $3/1024.0/1024.0/1024.0, $2/1024.0/1024.0/1024.0) }'
    EOT
    interval     = 10
    timeout      = 1
  }
}

# See https://registry.coder.com/modules/coder/code-server
module "code-server" {
  count  = data.coder_workspace.me.start_count
  source = "registry.coder.com/coder/code-server/coder"
  version = "~> 1.0"

  agent_id = coder_agent.main.id
  order    = 1
  
  # code-server 會自動使用：
  # - 認證：繼承 Coder 的 OIDC (GitHub) 認證
  # - 自動存檔：code-server 內建 auto-save
  # - Extensions：支援 GitHub Copilot（需要 GitHub token）
}

# See https://registry.coder.com/modules/coder/jetbrains
module "jetbrains" {
  count      = data.coder_workspace.me.start_count
  source     = "registry.coder.com/coder/jetbrains/coder"
  version    = "~> 1.1"
  agent_id   = coder_agent.main.id
  agent_name = "main"
  folder     = "/home/coder"
  tooltip    = "You need to [install JetBrains Toolbox](https://coder.com/docs/user-guides/workspace-access/jetbrains/toolbox) to use this app."
}