// --- File: server/db.ts (Mocked Version) ---
// This version mocks the database connection to allow the server to start
// without a real DATABASE_URL. Actual database operations will not work
// and will use these mock implementations.

// Original imports are commented out as we are not connecting to a real database.
// import { Pool, neonConfig } from '@neondatabase/serverless';
// import { drizzle } from 'drizzle-orm/neon-serverless';
// import ws from "ws";
import * as schema from "@shared/schema"; // Keep schema if other parts of server code might use its types for defining data structures.

// neonConfig.webSocketConstructor = ws; // Not needed for mock

// The check for DATABASE_URL is removed.
/*
if (!process.env.DATABASE_URL) {
  throw new Error(
    "DATABASE_URL must be set. Did you forget to provision a database?",
  );
}
*/

// Original pool and db exports are commented out.
/*
export const pool = new Pool({ connectionString: process.env.DATABASE_URL });
export const db = drizzle({ client: pool, schema });
*/

// --- NEW MOCK IMPLEMENTATION ---
console.warn(
  "INFO: server/db.ts - DATABASE_URL is not configured or this is a mock setup. " +
  "Running in no-database mode. Database operations will be non-functional or mocked."
);

// Mock for 'db'. This needs to be expanded if your application calls more Drizzle methods.
// Using 'as any' to simplify typing for this mock during this troubleshooting phase.
export const db = {
  // Mocking a 'select from where' chain
  select: (..._args: any[]) => {
    console.warn("MOCK DB: db.select() called.");
    return {
      from: (_table: any) => {
        console.warn("MOCK DB: db.select().from() called.");
        return {
          where: async (_condition?: any) => {
            console.warn("MOCK DB: db.select().from().where() called. Returning empty array.");
            return [];
          },
          // Add other common chainable methods if used, e.g., limit, offset, orderBy
          // Mocking common Drizzle execution patterns:
          execute: async () => {
            console.warn("MOCK DB: db.select().from().execute() called. Returning empty array.");
            return [];
          },
          findMany: async (_condition?: any) => {
            console.warn("MOCK DB: db.select().from().findMany() called. Returning empty array.");
            return [];
          },
          findOne: async (_condition?: any) => {
            console.warn("MOCK DB: db.select().from().findOne() called. Returning undefined.");
            return undefined;
          }
        };
      },
    };
  },
  // Mocking an 'insert into values' chain
  insert: (..._args: any[]) => {
    console.warn("MOCK DB: db.insert() called.");
    return {
      into: (_table: any) => {
        console.warn("MOCK DB: db.insert().into() called.");
        return {
          values: async (_data: any) => {
            console.warn("MOCK DB: db.insert().into().values() called. Returning mock result.");
            return { affectedRows: 0, insertId: null, rows: [] }; // Drizzle often returns rows/returning
          },
          execute: async () => {
            console.warn("MOCK DB: db.insert().into().execute() called. Returning mock result.");
            return { affectedRows: 0, insertId: null, rows: [] };
          },
          returning: async () => { // if .returning() is used
            console.warn("MOCK DB: db.insert().into().returning() called. Returning empty array.");
            return [];
          }
        };
      },
    };
  },
  // Add basic mocks for other common top-level Drizzle methods if your app uses them directly.
  // For example, if you use db.query.yourTable.findMany():
  query: new Proxy({}, {
    get: function(_target, prop_table) {
      console.warn(`MOCK DB: db.query.${String(prop_table)} accessed.`);
      return new Proxy({}, {
        get: function(_target_table, prop_method) {
          console.warn(`MOCK DB: db.query.${String(prop_table)}.${String(prop_method)}() called.`);
          return async (..._args: any[]) => {
            console.warn(`MOCK DB: db.query.${String(prop_table)}.${String(prop_method)}() executing. Returning empty array/undefined based on method.`);
            if (String(prop_method).includes('findMany')) return [];
            if (String(prop_method).includes('findOne')) return undefined;
            return []; // Default empty array
          };
        }
      });
    }
  }),
  // Add update, delete, etc., as needed, following a similar pattern.
  // e.g. db.update(...).set(...).where(...).execute() / .returning()
  update: (..._args: any[]) => {
    console.warn("MOCK DB: db.update() called.");
    return {
      set: (_data: any) => ({
        where: async (_condition?: any) => {
          console.warn("MOCK DB: db.update().set().where() called. Returning mock result.");
          return { affectedRows: 0, rows: [] };
        },
        execute: async () => {
          console.warn("MOCK DB: db.update().set().execute() called. Returning mock result.");
          return { affectedRows: 0, rows: [] };
        },
        returning: async () => {
          console.warn("MOCK DB: db.update().set().returning() called. Returning empty array.");
          return [];
        }
      })
    };
  },
  delete: (..._args: any[]) => {
    console.warn("MOCK DB: db.delete() called.");
    return {
      from: (_table: any) => ({ // Drizzle's delete is often `db.delete(tables.users).where(...)`
         where: async (_condition?: any) => {
            console.warn("MOCK DB: db.delete().where() called. Returning mock result.");
            return { affectedRows: 0 };
         },
         execute: async () => {
            console.warn("MOCK DB: db.delete().execute() called. Returning mock result.");
            return { affectedRows: 0 };
         },
         returning: async () => {
            console.warn("MOCK DB: db.delete().returning() called. Returning empty array.");
            return [];
         }
      }),
    };
  }
} as any; // Using 'as any' to avoid needing to mock every single Drizzle method exhaustively.

// Mock for 'pool' if it's used directly anywhere (less common with Drizzle ORM).
export const pool = {
  connect: async () => {
    console.warn("MOCK DB: pool.connect called.");
    return {
      query: async (_sql: string, _params?: any[]) => {
        console.warn("MOCK DB: pool.query called. Returning empty result.");
        return { rows: [], rowCount: 0 };
      },
      release: () => {
        console.warn("MOCK DB: pool.release called.");
      },
    };
  },
  // Add other methods if your 'pool' object is used for more.
} as any; // Using 'as any' for simplicity.

// The schema import is kept because other parts of your application might
// use the TypeScript types defined in your Drizzle schema (e.g., for API request/response bodies),
// even if you're not actually querying the database.
// If you are certain no other server file uses types from the schema, you could comment out
// the `import * as schema from "@shared/schema";` line, but it's generally safer to keep it.
// This also makes the `drizzle({ client: pool, schema })` line happy if it were not commented.
export { schema }; // Re-export schema if it was imported, so other files can still get it