import { promises, readFileSync, writeFileSync } from 'fs';
import { emitConstructForApiObject, findApiObjectDefinitions } from './codegen-constructs';
import { CodeMaker } from 'codemaker';
import { JSONSchema4 } from 'json-schema';
import * as path from "path"

export interface Options {
  readonly apiVersion: string;
}

export async function generateAllApiObjects(outdir: string) {
  const version = '2.52.0'
  const code = new CodeMaker();
  code.indentation = 2;

  const schema = await downloadSchema();

  const topLevelObjects = findApiObjectDefinitions(schema);

  for (const provider of Object.keys(topLevelObjects)) {
    const files = []
    for (const type of Object.keys(topLevelObjects[provider])) {
      for (const o of topLevelObjects[provider][type]) {  
        files.push(emitConstructForApiObject(code, o, provider, type, version));
      }
    }
    writeIndex(code, files, provider)
  }  
  await promises.mkdir(outdir, { recursive: true });
  await code.save(outdir);  

  for (const provider of Object.keys(topLevelObjects)) {
    writePackageJson(path.join(outdir, provider), provider)
  }
}

async function downloadSchema() {
  const output = readFileSync(path.join(process.cwd(), 'schema.json'))
  return JSON.parse(output.toString()) as JSONSchema4;
}

async function writeIndex(code: CodeMaker, files: Array<string>, filePath: string) {
  const sourceFile = path.join(filePath, 'index.ts')
  code.openFile(sourceFile);
  code.line(`// generated by terrastack.io`);
  code.line();
  files.forEach(file => {
    code.line(`export * from './${file.replace(`${filePath}/`, '')}';`);
  })
  code.line();
  code.closeFile(sourceFile);
}

async function writePackageJson(workdir: string, provider: string) {
  const main = 'index'
  const pkg = {
    name: `@terrastack/${provider}-provider`,
    version: '0.0.0',
    author: "sebastian@korfmann.net",
    main: `${main}.js`,
    types: `${main}.d.ts`,
    license: 'Apache-2.0',
    scripts: {
      build: "jsii",
      watch: "jsii -w",
      package: "jsii-pacmak",
    },
    repository: { url: 'https://github.com/terrastackio/terrastack', type: 'git' },
    jsii: {
      outdir: "dist",
      targets: {
        python: {
          distName: `terrastack-${provider}-provider`,
          module: `terrastack-${provider}-provider`
        }
      }
    },    
    dependencies: {
      "@aws-cdk/core": "*",
      "@terrastack/core": "*",
    },
    devDependencies: {
      "@types/node": "^13.7.7",
      jsii: "^0.22.0",
      "jsii-pacmak": "^0.22.0"
    },  
    peerDependencies: {
      "@aws-cdk/core": "*",
      "@terrastack/core": "*",
    }

  };
  writeFileSync(path.join(workdir, 'package.json'), JSON.stringify(pkg, undefined, 2));
}