import Foundation
import Testing
@testable import gitbay

private func makeClient() throws -> (GitbayClient, StubProtocol.Box) {
    let box = StubProtocol.box()
    let client = GitbayClient(
        instance: try GitbayInstance(url: "https://gitbay.org"),
        token: "test-token",
        session: box.session()
    )
    return (client, box)
}

private func show(_ fields: String) -> String {
    #"{"protocol_version":1,"data":{"mail":true,"watch":false,"#  + fields + #"},"exit_code":0}"#
}

@MainActor
struct ReplyByMailTests {

    @Test func theSwitchShowsWhereTheInstanceReadsReplies() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: show(#""reply":false,"reply_available":true"#), match: "argv=show"))
        let model = AccountViewModel(client: client)

        await model.loadNotificationPreferences()

        #expect(model.replyOn == false)
        #expect(model.offersReply)
    }

    @Test func noSwitchWhereTheInstanceDoesNot() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: show(#""reply":false,"reply_available":false"#), match: "argv=show"))
        let model = AccountViewModel(client: client)

        await model.loadNotificationPreferences()

        #expect(!model.offersReply)
    }

    /// A server without reply_available says nothing either way: the
    /// switch shows, and the refusal explains if it cannot be turned on.
    @Test func anOlderServerShowsTheSwitch() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: show(#""reply":false"#), match: "argv=show"))
        let model = AccountViewModel(client: client)

        await model.loadNotificationPreferences()

        #expect(model.offersReply)
    }

    @Test func turningItOnSendsReplyOn() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: #"{"protocol_version":1,"data":{},"exit_code":0}"#, match: "cmd"))
        stub.enqueue(.init(status: 200, json: show(#""reply":true,"reply_available":true"#), match: "argv=show"))
        let model = AccountViewModel(client: client)

        await model.setReply(true)

        let write = try #require(stub.seen.first { $0.method == "POST" })
        let body = try #require(try JSONSerialization.jsonObject(with: write.body) as? [String: Any])
        #expect(body["argv"] as? [String] == ["notifications", "settings", "reply", "on"])
        #expect(model.replyOn == true)
    }
}