// swift-tools-version:5.1
import PackageDescription

let package = Package(
    name: "MyPackage",
    platforms: [
        .macOS(.v10_14) // minimum macOS version driver supports
    ],
    dependencies: [
        .package(url: "https://github.com/mongodb/mongo-swift-driver", .upToNextMajor(from: "1.3.1"))
    ],
    targets: [
        // Async module
        .target(name: "MyAsyncTarget", dependencies: ["MongoSwift"]),
        // Sync module
        .target(name: "MySyncTarget", dependencies: ["MongoSwiftSync"])
    ]
)

import MongoSwift
import NIOPosix

let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
let client = try MongoClient("mongodb://localhost:27017", using: elg)

defer {
    // clean up driver resources
    try? client.syncClose()
    cleanupMongoSwift()

    // shut down EventLoopGroup
    try? elg.syncShutdownGracefully()
}

let db = client.db("myDB")
let collection = try await db.createCollection("myCollection")
// use collection...

import MongoSwift
import NIOPosix

let elg = MultiThreadedEventLoopGroup(numberOfThreads: 4)
let client = try MongoClient("mongodb://localhost:27017", using: elg)

defer {
    // clean up driver resources
    try? client.syncClose()
    cleanupMongoSwift()

    // shut down EventLoopGroup
    try? elg.syncShutdownGracefully()
}

let db = client.db("myDB")

let result = db.createCollection("myCollection").flatMap { collection in
    // use collection...
}

import MongoSwiftSync

defer {
    // free driver resources
    cleanupMongoSwift()
}

let client = try MongoClient("mongodb://localhost:27017")

let db = client.db("myDB")
let collection = try db.createCollection("myCollection")

// use collection...

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
let result = try await collection.insertOne(doc)
print(result?.insertedID ?? "") // prints `.int64(100)`

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
collection.insertOne(doc).whenSuccess { result in
    print(result?.insertedID ?? "") // prints `.int64(100)`
}

let doc: BSONDocument = ["_id": 100, "a": 1, "b": 2, "c": 3]
let result = try collection.insertOne(doc)
print(result?.insertedID ?? "") // prints `.int64(100)`

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
for try await doc in try await collection.find(query, options: options) {
    print(doc)
}

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
let result = collection.find(query, options: options).flatMap { cursor in
    cursor.forEach { doc in
        print(doc)
    }
}

let query: BSONDocument = ["a": 1]
// The `sort` option specifies the order in which results are returned
// via the cursor. In this case, `["_id": -1]` indicates that the documents will
// be returned in descending order according to the `_id` field.
let options = FindOptions(sort: ["_id": -1])
let documents = try collection.find(query, options: options)
for d in documents {
    print(try d.get())
}

var doc: BSONDocument = ["a": 1, "b": 2, "c": 3]

print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3}`
print(doc["a"] ?? "") // prints `.int64(1)`

// Set a new value
doc["d"] = 4
print(doc) // prints `{"a" : 1, "b" : 2, "c" : 3, "d" : 4}`

// Using functional methods like map, filter:
let evensDoc = doc.filter { elem in
    guard let value = elem.value.asInt() else {
        return false
    }
    return value % 2 == 0
}
print(evensDoc) // prints `{ "b" : 2, "d" : 4 }`

let doubled = doc.map { elem -> Int in
    guard case let value = .int64(value) else {
        return 0
    }

    return Int(value * 2)
}
print(doubled) // prints `[2, 4, 6, 8]`