import Foundation
import Testing
@testable import SamsungProtocol

private let parser = SamsungEventParser(maximumMessageBytes: 256)

@Test func parsesAllowlistedPairingEvents() throws {
    #expect(try parser.parse(Data(#"{"event":"ms.channel.connect","data":{"token":"synthetic-token"}}"#.utf8)) == .connected(token: "synthetic-token"))
    #expect(try parser.parse(Data(#"{"event":"ms.channel.connect","data":{}}"#.utf8)) == .connected(token: nil))
    #expect(try parser.parse(Data(#"{"event":"ms.channel.unauthorized"}"#.utf8)) == .unauthorized)
    #expect(try parser.parse(Data(#"{"event":"ms.channel.timeOut"}"#.utf8)) == .timedOut)
    #expect(try parser.parse(Data(#"{"event":"ms.error","data":{"message":"redacted"}}"#.utf8)) == .error)
}

@Test func unknownEventsAreInert() throws {
    let fixture = Data(#"{"event":"synthetic.unknown","data":{"token":"not-consumed"}}"#.utf8)
    #expect(try parser.parse(fixture) == .unknown)
}

@Test func rejectsMalformedEmptyAndOversizedMessages() {
    #expect(throws: SamsungEventParserError.empty) { try parser.parse(Data()) }
    #expect(throws: SamsungEventParserError.malformed) { try parser.parse(Data(#"{"event":42}"#.utf8)) }
    #expect(throws: SamsungEventParserError.oversized) { try parser.parse(Data(repeating: 0x41, count: 257)) }
}

@Test func boundsEventNamesAndTokens() {
    let longEvent = String(repeating: "e", count: SamsungEventParser.maximumEventNameBytes + 1)
    let eventFixture = Data(#"{"event":"\#(longEvent)"}"#.utf8)
    #expect(throws: SamsungEventParserError.invalidEventName) { try parser.parse(eventFixture) }

    let tokenParser = SamsungEventParser(maximumMessageBytes: 8 * 1024)
    let longToken = String(repeating: "t", count: SamsungEventParser.maximumTokenBytes + 1)
    let tokenFixture = Data(#"{"event":"ms.channel.connect","data":{"token":"\#(longToken)"}}"#.utf8)
    #expect(throws: SamsungEventParserError.invalidToken) { try tokenParser.parse(tokenFixture) }
    #expect(throws: SamsungEventParserError.invalidToken) {
        try tokenParser.parse(Data(#"{"event":"ms.channel.connect","data":{"token":""}}"#.utf8))
    }
}