import { promises as fsp } from 'node:fs';
import path from 'node:path';
import { writeFile } from './write-file';
import { SkillFilesResponse } from './fetch-skill-files';

const generateClaudeMd = (productModuleName: string): string => {
  return `# ${productModuleName} - AI Agent Instructions

## MANDATORY: Read Documentation Before ANY Change

Before making any change to code, schemas, or configuration:

1. **Read \`docs/overview.md\` FIRST** — it maps every task type to the specific rule files you need
2. **Read only the relevant \`.cursor/rules/*.mdc\` files** for your task (the overview tells you which ones)
3. Only then start implementing changes

Do NOT read all rule files. The overview tells you exactly which 2-4 files you need for any given task.

---

## Quick Task Map

| Task Type | Rule files to read (in \`.cursor/rules/\`) |
|-----------|-------------------------------------------|
| Writing hooks in \`code/\` | \`product-module-code--product-module-code-basics.mdc\` + the relevant hook file |
| Updating \`.root-config.json\` | \`configuration-guide--root-config-critical-updates.mdc\` + relevant settings file |
| Quote/application schemas | \`schema-form--schema-form-overview-and-rules.mdc\` + \`schema-form--schema-form-forbidden-properties-and-anti-patterns.mdc\` |
| Claim workflow schemas | \`claim-blocks--claim-blocks-overview-and-wrapper.mdc\` + relevant block type file |
| CLI commands | \`workbench-cli--workbench-cli-safety-and-core-sync.mdc\` |
| Embed config changes | \`embed-config--embed-config-overview-and-global-settings.mdc\` + relevant section file |

For the full task map with all files, see \`docs/overview.md\`.

---

## Key Rules (MUST FOLLOW)

1. **No import/export statements** - All functions are available globally
2. **Always update .root-config.json** - When adding alteration hooks, scheduled functions, or fulfillment types
3. **Always use -f flag** - Use \`npx @rootplatform/cli push -f\` for draft updates
4. **Validate all inputs** - Use Joi validation schemas
5. **Currency values in cents** - Always integers, never floating point (R100 = 10000)
6. **Ask before pushing** - ALWAYS confirm with user before running push commands

---

## CLI Commands

| Command | Description |
|---------|-------------|
| \`npx @rootplatform/cli push -f\` | Push changes to draft |
| \`npx @rootplatform/cli test\` | Run unit tests |
| \`npx @rootplatform/cli publish\` | Publish draft to live |
| \`node preview/server.js\` | Start preview server |

---

## Project Structure

| Folder/File | Purpose |
|-------------|---------|
| \`code/\` | Product module JavaScript (NO import/export) |
| \`workflows/\` | JSON schemas (quote, application, claims) |
| \`workflows/alteration-hooks/\` | Alteration hook schemas |
| \`documents/\` | HTML templates for policy documents |
| \`.root-config.json\` | Product module configuration |
| \`docs/overview.md\` | Documentation index (read this first) |
| \`.cursor/rules/\` | Full reference docs (rule files by domain) |
`;
};

export const writeSkillFiles = async (params: {
  directory: string;
  skillFiles: SkillFilesResponse;
  productModuleName: string;
}): Promise<void> => {
  const { directory, skillFiles, productModuleName } = params;

  const cursorRulesDir = path.join(directory, '.cursor', 'rules');
  const docsDir = path.join(directory, 'docs');

  await fsp.mkdir(cursorRulesDir, { recursive: true });
  await fsp.mkdir(docsDir, { recursive: true });

  // Write overview doc
  if (skillFiles.overview) {
    await writeFile(path.join(docsDir, 'overview.md'), skillFiles.overview);
  }

  // Write CLAUDE.md
  await writeFile(path.join(directory, 'CLAUDE.md'), generateClaudeMd(productModuleName));

  // Write skill files as .cursor/rules/{domain}--{filename}
  for (const skill of skillFiles.skills) {
    const targetFilename = `${skill.domain}--${skill.filename}`;
    await writeFile(path.join(cursorRulesDir, targetFilename), skill.content);
  }
};