import { parseArgs } from "node:util"
import path from "node:path"
import { mkdir, copyFile } from "node:fs/promises"

const args = parseArgs({ options: { target: { type: "string" }, check: { type: "boolean" } } }).values
if (!args.target) throw new Error("用法：bun script/install-agentpaas.ts --target /absolute/project [--check]")
const source = path.resolve(import.meta.dir, "../.opencode")
const target = path.resolve(args.target, ".opencode")
if (target === source) throw new Error("目标不能是桥接源码目录")
const manifest = (await Bun.file(path.join(source, "agentpaas-manifest.json")).json()) as { files: string[] }
const changed: string[] = []
for (const name of manifest.files) {
  if (path.isAbsolute(name) || name.split(/[\\/]/).includes("..")) throw new Error("无效安装清单")
  const original = Bun.file(path.join(source, name))
  const existing = Bun.file(path.join(target, name))
  if (
    (await existing.exists()) &&
    Buffer.from(await existing.arrayBuffer()).equals(Buffer.from(await original.arrayBuffer()))
  )
    continue
  changed.push(name)
}
if (args.check) {
  console.log(JSON.stringify({ current: !changed.length, changed }, null, 2))
  process.exit(changed.length ? 1 : 0)
}
const backup = path.join(target, ".agentpaas-backups", `${Date.now()}-${crypto.randomUUID()}`)
for (const name of changed) {
  const destination = path.join(target, name)
  if (await Bun.file(destination).exists()) {
    await mkdir(path.dirname(path.join(backup, name)), { recursive: true })
    await copyFile(destination, path.join(backup, name))
  }
  await mkdir(path.dirname(destination), { recursive: true })
  await copyFile(path.join(source, name), destination)
}
console.log(
  JSON.stringify(
    {
      installed: target,
      updated: changed,
      backup_if_needed: backup,
      next: "设置 AGENTPAAS_URL 和 AGENTPAAS_API_KEY，使用当前 OpenCode fork 启动 --agent paas，或输入 /paas。不会修改你的模型或凭证配置。",
    },
    null,
    2,
  ),
)