import Testing

@testable import Utility

@Suite(
    "NormalizeEmail method",
    .tags(.method)
)
struct NormalizeEmailTests {

    // MARK: Properties

    private let normalize = NormalizeEmail()

    // MARK: Functional tests

    @Test(arguments: [
        ("fan@loudmail.nl", "fan@loudmail.nl"),
        ("Fan@LoudMail.NL", "fan@loudmail.nl"),
        (" fan@loudmail.nl\n", "fan@loudmail.nl"),
        ("fan+gigs@loudmail.nl", "fan+gigs@loudmail.nl"),
        // Exactly 254 bytes: the longest address the validator accepts.
        (String(repeating: "a", count: 242) + "@loudmail.nl", String(repeating: "a", count: 242) + "@loudmail.nl"),
    ])
    func `normalizes a valid address`(
        submitted: String,
        expected: String
    ) {
        #expect(normalize(submitted) == expected)
    }

    @Test(arguments: [
        nil,
        "",
        "   ",
        "not-an-email",
        "missing@dot",
        "@loudmail.nl",
        "fan@",
        "fan@.nl",
        "spaced out@loudmail.nl",
        "fan@loud mail.nl",
        // One byte over the 254-byte limit.
        String(repeating: "a", count: 243) + "@loudmail.nl",
        // Few enough characters, but multibyte ones put it over the byte limit.
        String(repeating: "é", count: 130) + "@loudmail.nl",
        // Control characters are not whitespace, so only the dedicated check catches them.
        "fan\u{00}@loudmail.nl",
        "fan@loudmail.nl\u{7F}",
    ] as [String?])
    func `rejects a missing or invalid address`(
        submitted: String?
    ) {
        #expect(normalize(submitted) == nil)
    }

}