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 let dashboardJSON = """
    {"protocol_version":1,"data":{\
    "review_queue":[{"repo":"krz/gitbay-ios","number":3,"title":"adopt aggregate","author":"cmc",\
    "state":"open","updated_at":"2026-08-27T10:00:00.000Z"}],\
    "pinned":[{"path":"krz/gitbay","visibility":"public","description":"a CLI-first git forge"}],\
    "open_mrs":[{"repo":"krz/gitbay-ios","number":3,"title":"adopt aggregate","author":"cmc",\
    "state":"open","updated_at":"2026-08-27T10:00:00.000Z"}],\
    "assigned_issues":[{"repo":"krz/gitbay","number":11,"title":"iOS app","author":"krz",\
    "state":"open","updated_at":"2026-08-26T10:00:00.000Z"}],\
    "open_issues":[{"repo":"krz/gitbay","number":11,"title":"iOS app","author":"krz",\
    "state":"open","updated_at":"2026-08-26T10:00:00.000Z"}],\
    "recent_activity":[{"id":7,"repo":"krz/gitbay-ios","actor":"cmc","kind":"mr.merged",\
    "data":{"number":2},"created_at":"2026-08-27T10:30:00.000Z"}],\
    "builds":[{"repo":"krz/gitbay","number":9,"job":"ci","status":"success",\
    "sha":"65ba14e0000000000000","ref":"refs/heads/main",\
    "created_at":"2026-08-27T09:00:00.000Z","finished_at":"2026-08-27T09:05:00.000Z"}]},\
    "exit_code":0}
    """

private let emptyDashboardJSON = """
    {"protocol_version":1,"data":{"pinned":[],"open_mrs":[],"assigned_issues":[],"builds":[]},\
    "exit_code":0}
    """

@MainActor
struct DashboardViewModelTests {

    @Test func oneReadFillsEverySection() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: dashboardJSON))
        let model = DashboardViewModel(client: client)

        await model.load()

        let data = try #require(model.state.value)
        #expect(data.pinned.map(\.path) == ["krz/gitbay"])
        #expect(data.reviewQueue.map(\.id) == ["krz/gitbay-ios#3"])
        #expect(data.openMRs.map(\.id) == ["krz/gitbay-ios#3"])
        #expect(data.assignedIssues.first?.number == 11)
        #expect(data.openIssues.first?.number == 11)
        #expect(data.recentActivity.first?.phrase == "merged !2")
        #expect(data.builds.first?.status == "success")
        // The whole screen cost exactly one request.
        #expect(stub.seen.count == 1)
        #expect(stub.seen.first?.url.query() == "argv=dashboard")
    }

    @Test func emptyAggregateStillLoads() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 200, json: emptyDashboardJSON))
        let model = DashboardViewModel(client: client)

        await model.load()

        let data = try #require(model.state.value)
        #expect(data.pinned.isEmpty)
        #expect(data.openMRs.isEmpty)
        #expect(data.reviewQueue.isEmpty)
        #expect(data.openIssues.isEmpty)
        #expect(data.recentActivity.isEmpty)
    }

    @Test func aFailureIsTheScreensState() async throws {
        let (client, stub) = try makeClient()
        stub.enqueue(.init(status: 500, json:
            #"{"protocol_version":1,"error":"boom","exit_code":1}"#))
        stub.enqueue(.init(status: 500, json:
            #"{"protocol_version":1,"error":"boom","exit_code":1}"#))
        let model = DashboardViewModel(client: client)

        await model.load()

        guard case .failed = model.state else {
            Issue.record("expected .failed, got \(model.state)")
            return
        }
    }
}