// SPDX-License-Identifier: LicenseRef-ConusAI-Template-1.0
// The layer rules of this repository, generated from the folder tree so a module added
// tomorrow is covered without anybody editing a list (app-template spec §2). Read by
// .dependency-cruiser.cjs and by test/boundaries.test.ts.
"use strict"

const fs = require("node:fs")
const path = require("node:path")

/** The module ids under modules/, which is the only place a domain module lives. */
function listModules(root) {
  const dir = path.join(root, "modules")
  if (!fs.existsSync(dir)) return []
  return fs
    .readdirSync(dir, { withFileTypes: true })
    .filter((entry) => entry.isDirectory())
    .map((entry) => entry.name)
    .sort()
}

/** What a module's core may never reach: an engine, an SDK or a framework (spec §2). */
const DRIVERS_AND_FRAMEWORKS = [
  "^(kysely|pg|pg-boss|mongodb|hono)$",
  "^(react|react-dom|@tanstack/react-router|@tanstack/react-start)(/|$)",
  "^@conusai-kit/(data-kysely|data-mongo|data-convex|jobs-pgboss|platform|ui|i18n|auth)(/|$)",
  "^@conusai-sdk/",
]

/** The marker of a screen that is truly domain-specific: `// kit:custom-ui <why>`, near the top of the file. */
const CUSTOM_UI = /^\s*(?:\/\/|\{\/\*|\/\*)\s*kit:custom-ui\s+\S/m

/** Every `.tsx` under the folders that hold screens, relative to `root`. */
function listScreens(root) {
  const found = []
  const walk = (dir) => {
    if (!fs.existsSync(dir)) return
    for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
      const full = path.join(dir, entry.name)
      if (entry.isDirectory()) walk(full)
      else if (entry.name.endsWith(".tsx") && !entry.name.endsWith(".test.tsx")) found.push(path.relative(root, full))
    }
  }
  walk(path.join(root, "apps/web/src/routes"))
  walk(path.join(root, "apps/web/src/ui"))
  for (const id of listModules(root)) walk(path.join(root, "modules", id, "ui"))
  return found.sort()
}

/** The screens that declare themselves custom, by the marker in their own first lines. */
function listCustomScreens(root) {
  return listScreens(root).filter((file) =>
    CUSTOM_UI.test(fs.readFileSync(path.join(root, file), "utf8").split("\n").slice(0, 20).join("\n")),
  )
}

const escaped = (file) => file.replace(/[.*+?^${}()|[\]\\]/g, "\\$&")

function buildForbidden(moduleIds, customScreens = []) {
  const rules = [
    {
      name: "ui-comes-from-the-kit",
      severity: "error",
      comment:
        "A screen imports @conusai-kit/ui, never React Aria itself: use a pattern of @conusai-kit/ui/patterns or a primitive, or say why the screen is its own with `// kit:custom-ui <why>`.",
      from: { path: "^(apps|modules)/", pathNot: customScreens.map((file) => `^${escaped(file)}$`) },
      to: { path: "(^|/)(react-aria-components|react-aria|react-stately|@react-aria/[^/]+|@react-stately/[^/]+)(/|$)" },
    },
    {
      name: "no-circular",
      severity: "error",
      comment: "A cycle between files makes the order they run in an accident. Move the shared part down a layer.",
      from: {},
      to: { circular: true },
    },
    {
      name: "worker-entry-is-the-workers-own",
      severity: "error",
      comment:
        "@conusai-kit/core/worker mints system actors. Only apps/worker may import it, so no transport can act as one (kit-core system-actor.ts).",
      from: { pathNot: "^apps/worker/" },
      // The resolved path, not the specifier: dependency-cruiser matches what a module resolves
      // to, and in a pnpm store that is .../@conusai-kit/core/dist/worker.js.
      to: { path: "@conusai-kit/core/dist/worker\\." },
    },
    {
      name: "core-imports-no-engine-sdk-or-framework",
      severity: "error",
      comment:
        "A use case under modules/<id>/core is pure TypeScript over the ports of @conusai-kit/core|data|tenancy, so it runs on every profile and needs no database to test (spec §2).",
      from: { path: "^modules/[^/]+/core/" },
      to: { path: DRIVERS_AND_FRAMEWORKS },
    },
    {
      name: "contract-is-contract-only",
      severity: "error",
      comment:
        "A module's contract/ is what other modules import, so it may not reach back into its own core, adapters or ui.",
      from: { path: "^modules/([^/]+)/contract/" },
      to: { path: "^modules/$1/(core|adapters|ui)/" },
    },
    {
      name: "ui-talks-to-contracts-not-to-core",
      severity: "error",
      comment:
        "A module's pages read and write through the data facade and its own contract, never its use cases (spec §6.3).",
      from: { path: "^modules/([^/]+)/ui/" },
      to: { path: "^modules/$1/(core|adapters)/" },
    },
    {
      name: "a-module-never-imports-an-app",
      severity: "error",
      comment: "apps/* are composition roots: they import modules, never the other way round.",
      from: { path: "^modules/" },
      to: { path: "^apps/" },
    },
    {
      name: "config-is-below-everything",
      severity: "error",
      comment: "config/ is read by apps and modules, so it may not import either of them.",
      from: { path: "^config/" },
      to: { path: "^(apps|modules)/" },
    },
  ]

  // One rule per module, from the folder tree: a module reaches another only through its
  // contract/, and the message names both modules.
  for (const id of moduleIds) {
    const others = moduleIds.filter((other) => other !== id)
    if (others.length === 0) continue
    rules.push({
      name: `module-${id}-crosses-only-contracts`,
      severity: "error",
      comment: `modules/${id} may import another module's contract/ and nothing else of it (spec §2, §4.4).`,
      from: { path: `^modules/${id}/` },
      to: { path: `^modules/(${others.join("|")})/(?!contract/)` },
    })
  }

  return rules
}

module.exports = { DRIVERS_AND_FRAMEWORKS, buildForbidden, listCustomScreens, listModules, listScreens }