import "dotenv/config";
import { z } from "zod";

const configSchema = z.object({
  engine: z.object({
    mnemonic: z.string().min(1, "ENGINE_MNEMONIC is required"),
    database: z.object({
      path: z.string().default("./data/xo"),
      fileName: z.string().default("engine.db"),
    }),
  }),
  syncServer: z.object({
    url: z.string().default("https://sync.xo.harvmaster.com"),
  }),
  // TODO: Remove merchant - eww.
  merchant: z.object({
    name: z.string().default("XO Snack Machine"),
  }),
  database: z.object({
    path: z.string().default("data.db"),
  }),
  server: z.object({
    port: z.coerce.number().default(3000),
    host: z.string().default("0.0.0.0"),
    cors: z
      .object({
        origin: z.string().default("*"),
        methods: z
          .array(z.string())
          .default(["GET", "POST", "PUT", "DELETE", "OPTIONS"]),
        allowedHeaders: z
          .array(z.string())
          .default(["Content-Type", "Authorization"]),
      })
      .partial()
      .prefault({}),
  }),
});

type ConfigInput = z.input<typeof configSchema>;
type ConfigSchema = z.output<typeof configSchema>;

/**
 * The Config class is used to load and parse the configuration for the vending machine.
 */
export class Config {
  static fromEnv(): Config {
    return this.from({
      engine: {
        mnemonic: process.env.ENGINE_MNEMONIC ?? "",
        database: {
          path: process.env.ENGINE_DATABASE_PATH,
        },
      },
      syncServer: {
        url: process.env.SYNC_SERVER_URL,
      },
      // TODO: Remove merchant - eww.
      merchant: {
        name: process.env.MERCHANT_NAME,
      },
      database: {
        path: process.env.DATABASE_PATH,
      },
      server: {
        port: process.env.SERVER_PORT,
        host: process.env.SERVER_HOST,
      },
    });
  }

  static from(config: ConfigInput): Config {
    return new Config(configSchema.parse(config));
  }

  public get syncServer() {
    return this.config.syncServer;
  }

  // TODO: Remove merchant - eww.
  public get merchant() {
    return this.config.merchant;
  }

  public get engine() {
    return this.config.engine;
  }

  public get database() {
    return this.config.database;
  }

  public get server() {
    return this.config.server;
  }

  private constructor(private readonly config: ConfigSchema) {}
}