//
// # REQ0015:
// ## PURPOSE:
//
// This is a script to convert `schema.json` exported from pocketbase to dbml formatted file `schema.dbml`
//
//

const fs = require("fs");
const path = require("path");
// Load schema.json
const schemaPath = path.join(process.cwd(), "schema.json");
const schema = JSON.parse(fs.readFileSync(schemaPath, "utf8"));

// Type mapping from PocketBase to DBML/SQL
const typeMapping = {
  text: "text",
  number: "integer",
  bool: "boolean",
  email: "text",
  url: "varchar",
  date: "datetime",
  select: "varchar",
  json: "text",
  file: "file",
  password: "varchar",
  relation: "integer", // Assuming relations are stored as integer IDs
  autodate: "datetime",
};

function convertToDBML(schema) {
  let dbml = "";
  dbml = "// Generated at:  " + new Date().toISOString();
  dbml = dbml + "\n\n\n";

  let collectionIdToTableMapping = {};
  for (const [idx, tableDef] of Object.entries(schema)) {
    collectionIdToTableMapping[tableDef.id] = tableDef.name;
  }

  for (const [idx, tableDef] of Object.entries(schema)) {
    console.log({ idx });
    dbml += `// \n`;
    dbml += `// collection id:   ${tableDef.id} \n`;
    dbml += `// collection name: ${tableDef.name} \n`;
    dbml += `// collection type: ${tableDef.type} \n`;
    dbml += `Table ${tableDef.name} {\n`;

    for (const field of tableDef.fields) {
      // Get field type
      let fieldType = typeMapping[field.type] || "text";

      // Handle special cases
      if (field.type === "number" && field.options?.max === 1) {
        fieldType = "boolean";
      }

      // Build field definition
      let line = `  ${field.name} ${fieldType}`;

      // Add constraints
      const constraints = [];
      if (field.name === "id" || field.primary) constraints.push("pk");
      if (field.required) constraints.push("not null");
      if (constraints.length > 0) line += ` [${constraints.join(", ")}]`;

      if (field.collectionId) {
        line += ` [ref: > ${
          collectionIdToTableMapping[field.collectionId]
        }.id] // ${field.id}`;
      }

      dbml += `${line}\n`;
      console.log({ line });
    }

    dbml += "}\n\n";
  }

  return dbml;
}

// Convert and save
const dbmlOutput = convertToDBML(schema);
fs.writeFileSync("schema.dbml", dbmlOutput);
console.log("DBML file generated successfully!");