normogen/backend/src/db/init.rs

use mongodb::{bson::doc, options::IndexOptions, Collection, IndexModel};

use anyhow::Result;

/// Creates required collections and indexes. Best-effort by design: index
/// creation failures are logged as warnings and do not abort startup, matching
/// the existing swallow-on-warning style. Safe to run repeatedly (idempotent).
pub struct DatabaseInitializer {
    db: mongodb::Database,
}

impl DatabaseInitializer {
    pub fn new(db: mongodb::Database) -> Self {
        Self { db }
    }

    pub async fn initialize(&self) -> Result<()> {
        println!("[MongoDB] Initializing database collections and indexes...");

        // Create users collection and index
        {
            let collection: Collection<mongodb::bson::Document> = self.db.collection("users");

            // Create email index using the builder pattern
            let index = IndexModel::builder()
                .keys(doc! { "email": 1 })
                .options(IndexOptions::builder().unique(true).build())
                .build();

            match collection.create_index(index, None).await {
                Ok(_) => println!("✓ Created index on users.email"),
                Err(e) => println!("Warning: Failed to create index on users.email: {}", e),
            }
        }

        // Create families collection and indexes
        {
            let collection: Collection<mongodb::bson::Document> = self.db.collection("families");

            let index1 = IndexModel::builder().keys(doc! { "userId": 1 }).build();

            let index2 = IndexModel::builder().keys(doc! { "familyId": 1 }).build();

            match collection.create_index(index1, None).await {
                Ok(_) => println!("✓ Created index on families.userId"),
                Err(e) => println!("Warning: Failed to create index on families.userId: {}", e),
            }

            match collection.create_index(index2, None).await {
                Ok(_) => println!("✓ Created index on families.familyId"),
                Err(e) => println!(
                    "Warning: Failed to create index on families.familyId: {}",
                    e
                ),
            }
        }

        // Create profiles collection and index
        {
            let collection: Collection<mongodb::bson::Document> = self.db.collection("profiles");

            let index = IndexModel::builder().keys(doc! { "familyId": 1 }).build();

            match collection.create_index(index, None).await {
                Ok(_) => println!("✓ Created index on profiles.familyId"),
                Err(e) => println!(
                    "Warning: Failed to create index on profiles.familyId: {}",
                    e
                ),
            }
        }

        // Create health_data collection
        {
            let _collection: Collection<mongodb::bson::Document> =
                self.db.collection("health_data");
            println!("✓ Created health_data collection");
        }

        // Create lab_results collection
        {
            let _collection: Collection<mongodb::bson::Document> =
                self.db.collection("lab_results");
            println!("✓ Created lab_results collection");
        }

        // Create medications collection
        {
            let _collection: Collection<mongodb::bson::Document> =
                self.db.collection("medications");
            println!("✓ Created medications collection");
        }

        // Create appointments collection
        {
            let _collection: Collection<mongodb::bson::Document> =
                self.db.collection("appointments");
            println!("✓ Created appointments collection");
        }

        // Create shares collection and index
        {
            let collection: Collection<mongodb::bson::Document> = self.db.collection("shares");

            let index = IndexModel::builder().keys(doc! { "familyId": 1 }).build();

            match collection.create_index(index, None).await {
                Ok(_) => println!("✓ Created index on shares.familyId"),
                Err(e) => println!("Warning: Failed to create index on shares.familyId: {}", e),
            }
        }

        // Create refresh_tokens collection and indexes.
        // - unique index on tokenHash (the only thing we ever look tokens up by)
        // - TTL index on expiresAt so expired tokens are auto-deleted by Mongo
        {
            let collection: Collection<mongodb::bson::Document> =
                self.db.collection("refresh_tokens");

            let unique_index = IndexModel::builder()
                .keys(doc! { "tokenHash": 1 })
                .options(IndexOptions::builder().unique(true).build())
                .build();

            // TTL: documents are deleted once their `expiresAt` timestamp passes.
            // With expireAfterSeconds=0, Mongo removes each doc exactly when the
            // datetime stored in `expiresAt` is reached.
            let ttl_index = IndexModel::builder()
                .keys(doc! { "expiresAt": 1 })
                .options(
                    IndexOptions::builder()
                        .expire_after(std::time::Duration::from_secs(0))
                        .build(),
                )
                .build();

            match collection.create_index(unique_index, None).await {
                Ok(_) => println!("✓ Created unique index on refresh_tokens.tokenHash"),
                Err(e) => println!(
                    "Warning: Failed to create index on refresh_tokens.tokenHash: {}",
                    e
                ),
            }
            match collection.create_index(ttl_index, None).await {
                Ok(_) => println!("✓ Created TTL index on refresh_tokens.expiresAt"),
                Err(e) => println!(
                    "Warning: Failed to create TTL index on refresh_tokens.expiresAt: {}",
                    e
                ),
            }
        }

        println!("[MongoDB] Database initialization complete");
        Ok(())
    }
}