import { cp, mkdir, readFile, readdir, rm, writeFile } from "node:fs/promises"
import path from "node:path"
import { fileURLToPath } from "node:url"
import { execFileSync } from "node:child_process"
import { existsSync } from "node:fs"
import { build } from "vite"

const root = fileURLToPath(new URL("../", import.meta.url))
const name = process.argv[2]
if (!["ui", "center-graphic"].includes(name)) throw new Error("Expected ui or center-graphic")
const packageRoot = path.join(root, "packages", name)
const output = path.join(packageRoot, "dist")
const manifest = JSON.parse(await readFile(path.join(packageRoot, "package.json"), "utf8"))
const externals = Object.keys({ ...manifest.dependencies, ...manifest.peerDependencies })

// Only this package's generated output is removed. Library builds never copy root public assets.
await rm(output, { recursive: true, force: true })
await build({
  configFile: false,
  root: packageRoot,
  publicDir: false,
  build: {
    target: "es2022",
    outDir: output,
    minify: false,
    lib: {
      entry: name === "ui"
        ? { index: path.join(packageRoot, "src/index.ts"), "theme/index": path.join(packageRoot, "src/theme/index.ts") }
        : { index: path.join(packageRoot, "src/index.ts"), reference: path.join(packageRoot, "src/reference.ts") },
      formats: ["es"],
      fileName: (_format, entry) => `${entry}.js`,
      cssFileName: "style",
    },
    rolldownOptions: {
      external: id => externals.some(dep => id === dep || id.startsWith(`${dep}/`)),
      onwarn(warning, warn) {
        // The UI component entrypoint retains the directive below; source directives are redundant.
        if (name === "ui" && warning.code === "MODULE_LEVEL_DIRECTIVE") return
        warn(warning)
      },
    },
  },
})

execFileSync(process.execPath, [path.join(root, "node_modules/typescript/bin/tsc"), "-p", path.join(packageRoot, "tsconfig.build.json")], { stdio: "inherit" })

// Declarations describe APIs, not stylesheet loading; explicit .js specifiers also support NodeNext.
async function finishDeclarations(directory) {
  for (const entry of await readdir(directory, { withFileTypes: true })) {
    const file = path.join(directory, entry.name)
    if (entry.isDirectory()) await finishDeclarations(file)
    else if (entry.name.endsWith(".d.ts")) {
      const text = (await readFile(file, "utf8"))
        .replace(/^import\s+["'][^"']+\.css["'];?\s*$/gm, "")
        .replace(/(from\s+["']|import\(["'])(\.\.?\/[^"']+)(["'])/g, (_match, before, specifier, after) => {
          const target = path.resolve(directory, specifier)
          const resolved = existsSync(`${target}.d.ts`) ? specifier
            : existsSync(path.join(target, "index.d.ts")) ? `${specifier}/index` : specifier
          return `${before}${resolved.endsWith(".js") ? resolved : `${resolved}.js`}${after}`
        })
      await writeFile(file, text)
    }
  }
}
await finishDeclarations(output)

if (name === "ui") {
  const entry = path.join(output, "index.js")
  await writeFile(entry, `"use client";\n${await readFile(entry, "utf8")}`)
  await mkdir(path.join(output, "theme"), { recursive: true })
  for (const entry of await readdir(path.join(packageRoot, "src/theme"))) {
    if (entry.endsWith(".css")) await cp(path.join(packageRoot, "src/theme", entry), path.join(output, "theme", entry))
  }
  await mkdir(path.join(output, "vendor"), { recursive: true })
  // Preserve the exact upstream CSS rather than shipping its CLI dependency graph to consumers.
  await cp(path.join(root, "node_modules/shadcn/dist/tailwind.css"), path.join(output, "vendor/shadcn-tailwind.css"))
  await cp(path.join(root, "node_modules/shadcn/LICENSE.md"), path.join(output, "vendor/shadcn-LICENSE.md"))
  const tailwind = (await readFile(path.join(packageRoot, "src/tailwind.css"), "utf8"))
    .replace('"shadcn/tailwind.css"', '"./vendor/shadcn-tailwind.css"')
    // The compiled folder is self-contained. Scanning it also avoids the
    // Windows file-source path case that drops index.js utility candidates.
    .replace(/@source "\.\/components";\r?\n@source "\.\/patterns";/, '@source "./";')
  await writeFile(path.join(output, "tailwind.css"), tailwind)
  await mkdir(path.join(output, "fonts"), { recursive: true })
  for (const file of ["NotoSansKR-variable.ttf", "NotoSansKR-OFL.txt"]) {
    await cp(path.join(root, "public/fonts", file), path.join(output, "fonts", file))
  }
  const theme = (await readFile(path.join(packageRoot, "src/theme.css"), "utf8"))
    .replace('/fonts/NotoSansKR-variable.ttf', './fonts/NotoSansKR-variable.ttf')
  await writeFile(path.join(output, "theme.css"), theme)
  await cp(path.join(packageRoot, "src/patterns/dashboard-status/dashboard-status.css"), path.join(output, "dashboard-status.css"))
} else {
  // Preserve CENTER's existing automatic component CSS behavior for both public entrypoints.
  for (const entry of ["index.js", "reference.js"]) {
    const file = path.join(output, entry)
    await writeFile(file, `import "./style.css";\n${await readFile(file, "utf8")}`)
  }
}