// Embed the DeepSeek Harness-specific browser skill at build time. The model-facing
// skill deliberately documents only injected browser_* tools; the repository's CLI
// skill is a separate interface and must never be concatenated here.
// Output: src/skill-content.generated.ts (gitignored, built before tsdown and
// before vitest), so registration is a pure in-memory read.
import { readFileSync, writeFileSync } from "node:fs";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";

const here = dirname(fileURLToPath(import.meta.url));
const pkg = join(here, "..");
const source = readFileSync(join(pkg, "skill", "SKILL.md"), "utf8");

function stripFrontmatter(markdown) {
  if (!markdown.startsWith("---\n")) return markdown;
  const end = markdown.indexOf("\n---\n", 4);
  return end === -1 ? markdown : markdown.slice(end + 5).replace(/^\s*\n/, "");
}

const SUPPORTED_BROWSER_TOOLS = [
  "browser_session_start",
  "browser_session_stop",
  "browser_session_list",
  "browser_navigate",
  "browser_navigate_back",
  "browser_navigate_forward",
  "browser_reload",
  "browser_wait_for_navigation",
  "browser_snapshot",
  "browser_observe",
  "browser_get_html",
  "browser_screenshot",
  "browser_console",
  "browser_network",
  "browser_click",
  "browser_hover",
  "browser_fill",
  "browser_select",
  "browser_press",
  "browser_tab_list",
  "browser_tab_create",
  "browser_tab_select",
  "browser_tab_close",
  "browser_tab_borrow",
  "browser_tab_return",
  "browser_request_help",
  "browser_emulate",
  "browser_window_resize",
];

function validateModelFacingSkill(markdown) {
  if (/\bbsk\b/i.test(markdown)) {
    throw new Error("DSH skill must not expose the internal CLI name");
  }
  if (/```(?:bash|sh|shell)\b/i.test(markdown)) {
    throw new Error("DSH skill must not contain command-line code blocks");
  }

  const mentioned = new Set(markdown.match(/\bbrowser_[a-z][a-z_]*\b/g) ?? []);
  const supported = new Set(SUPPORTED_BROWSER_TOOLS);
  const unknown = [...mentioned].filter((name) => !supported.has(name));
  const missing = SUPPORTED_BROWSER_TOOLS.filter((name) => !mentioned.has(name));
  if (unknown.length > 0) {
    throw new Error(`DSH skill mentions unsupported browser tools: ${unknown.join(", ")}`);
  }
  if (missing.length > 0) {
    throw new Error(`DSH skill omits supported browser tools: ${missing.join(", ")}`);
  }
}

const NAME = "browser-skill";
const DESCRIPTION =
  "Browser automation against the user's logged-in Chromium through this plugin's injected " +
  "browser_* tools. Use to visit and read pages, fill forms, click through flows, inspect tabs, " +
  "debug page activity, or smoke-test UI changes in a managed Agent Window.";

const content = `${stripFrontmatter(source).trim()}\n`;
validateModelFacingSkill(content);

const banner =
  "// GENERATED by scripts/build-skill-content.mjs — do not edit.\n" +
  "// Source: skill/SKILL.md (DeepSeek Harness browser_* tool instructions).\n";

writeFileSync(
  join(pkg, "src", "skill-content.generated.ts"),
  `${banner}export const BSK_SKILL_NAME = ${JSON.stringify(NAME)};\n` +
    `export const BSK_SKILL_DESCRIPTION = ${JSON.stringify(DESCRIPTION)};\n` +
    `export const BSK_SKILL_MARKDOWN = ${JSON.stringify(content)};\n`,
);
console.log(`skill-content.generated.ts written (${content.length} chars)`);