// Renders screens with demo data to PNGs in watch/screenshots. Skipped unless WC_SCREENSHOT_DIR is
// set, which xcodebuild passes through from TEST_RUNNER_WC_SCREENSHOT_DIR:
//
//   TEST_RUNNER_WC_SCREENSHOT_DIR=$PWD/screenshots xcodebuild ... test -only-testing:WristCodeTests/SnapshotTests

import ImageIO
import SwiftUI
import Testing
import UniformTypeIdentifiers
import WidgetKit
@testable import WristCode

private let outputDirectory = ProcessInfo.processInfo.environment["WC_SCREENSHOT_DIR"]

/// The Series 12 (46mm) screen in points.
private let screen = CGSize(width: 208, height: 248)

@MainActor @Suite(.enabled(if: outputDirectory != nil))
struct SnapshotTests {
    @Test func complication() async throws {
        let gateway = DemoGateway()
        let waiting = WaitingEntry(date: .now, content: .counts(try await gateway.summary(), stale: false))
        let feed = try await gateway.feed()
        for item in feed.needsYou {
            let target = item.requestThread
            try await gateway.respond(
                hostId: target.hostId, threadId: target.threadId,
                request: .decision(requestId: item.request!.id, decision: .decline))
        }
        let idle = WaitingEntry(date: .now, content: .counts(try await gateway.summary(), stale: false))

        try write(ComplicationGallery(waiting: waiting, waitingCount: feed.needsYou.count, idle: idle), "complication.png")
    }

    @Test func multiSelectQuestion() async throws {
        let detail = try await DemoGateway().thread(hostId: "mac-mini", threadId: "t-release")
        let view = ThreadView(
            hostId: "mac-mini", threadId: "t-release", detail: detail,
            selections: ["checks": ["unit", "lint"]], scrolls: false)
            .environment(AppModel.preview())
            .fontDesign(.rounded)
            .tint(Theme.work)
        try write(view, "thread-multiselect.png")
    }

    @Test func subagentCard() async throws {
        let feed = try await DemoGateway().feed()
        let item = try #require(feed.needsYou.first { $0.via != nil })
        try write(feedColumn { NeedsYouCard(item: item) }, "feed-subagent.png")
    }

    @Test func recentWithSettleAll() async throws {
        let feed = try await DemoGateway().feed()
        try write(feedColumn {
            RecentHeader(recent: feed.recent, more: feed.moreRecent)
            ForEach(feed.recent) { StatusCard(item: $0) }
            MoreRecentRow(count: feed.moreRecent)
        }, "feed-recent.png")
    }

    @Test func fullRecentList() async throws {
        // The preview model has every demo Recent thread loaded.
        try write(titled("Recent", RecentView(scrolls: false)), "recent.png")
    }

    @Test func subagentThread() async throws {
        let detail = try await DemoGateway().thread(hostId: "mac-mini", threadId: "t-homelab")
        try write(titled("Thread", ThreadView(hostId: "mac-mini", threadId: "t-homelab", detail: detail, scrolls: false)), "thread-subagent.png")
    }

    @Test func finishedThreadWithSettle() async throws {
        let detail = try await DemoGateway().thread(hostId: "laptop", threadId: "t-status")
        try write(titled("Thread", ThreadView(hostId: "laptop", threadId: "t-status", detail: detail, scrolls: false)), "thread-settle.png")
    }

    @Test func runningThreadWithAskFirst() async throws {
        let detail = try await DemoGateway().thread(hostId: "mac-mini", threadId: "t-scaffold")
        try write(titled("Thread", ThreadView(hostId: "mac-mini", threadId: "t-scaffold", detail: detail, scrolls: false)), "thread.png")
    }

    @Test func newThreadAndAgentList() async throws {
        let projects = try await DemoGateway().projects()
        // The demo opens on Mac mini › wristcode, with Ask before acting on as the mock shows it.
        UserDefaults.standard.removeObject(forKey: "lastModels")
        UserDefaults.standard.set(true, forKey: "askFirst")
        defer { UserDefaults.standard.removeObject(forKey: "askFirst") }
        try write(titled("New thread", NewThreadView(projects: projects, scrolls: false)), "new-thread.png")

        let host = try #require(projects.hosts.first)
        let project = try #require(host.projects.first)
        let list = AgentList(
            providers: host.providers, selected: project.defaultModel, defaultInstanceId: project.instanceId,
            scrolls: false) { _ in }
        try write(titled("Agent", list), "agent-list.png")
    }

    @Test func statusScreens() async throws {
        let status = try await DemoGateway().status()
        try write(titled("Status", StatusView(status: status, scrolls: false)), "status.png")
        try write(titled("Laptop", HostStatusView(hostId: "laptop", status: status, scrolls: false)), "status-environment.png")
        let result = PushResult(ok: true, at: .now, status: 200, reason: nil)
        try write(titled("Notifications", NotificationsView(status: status, result: result, scrolls: false)), "status-notifications.png")
    }

    /// Feed rows stacked as the feed's List lays them out, which ImageRenderer leaves blank.
    private func feedColumn(@ViewBuilder _ rows: () -> some View) -> some View {
        VStack(spacing: 6) {
            rows()
        }
        .padding(.horizontal, 4)
        .padding(.top, 10)
        .environment(AppModel.preview())
        .fontDesign(.rounded)
        .tint(Theme.work)
    }

    /// The screen under a title like the navigation bar's, which ImageRenderer leaves out.
    private func titled(_ title: String, _ view: some View) -> some View {
        VStack(alignment: .leading, spacing: 6) {
            Text(title)
                .font(.system(size: 17, weight: .semibold))
                .foregroundStyle(.white)
                .padding(.horizontal, 10)
                .padding(.top, 10)
            view
        }
        .environment(AppModel.preview())
        .fontDesign(.rounded)
        .tint(Theme.work)
    }

    /// Renders at the screen's width and as tall as the content, as if scrolled through.
    private func write(_ view: some View, _ name: String) throws {
        let renderer = ImageRenderer(content: view
            .frame(width: screen.width)
            .fixedSize(horizontal: false, vertical: true)
            .padding(.bottom, 8)
            .background(.black)
            .environment(\.colorScheme, .dark))
        renderer.scale = 2
        let image = try #require(renderer.cgImage)
        let url = URL(fileURLWithPath: try #require(outputDirectory)).appending(path: name)
        let destination = try #require(CGImageDestinationCreateWithURL(url as CFURL, UTType.png.identifier as CFString, 1, nil))
        CGImageDestinationAddImage(destination, image, nil)
        #expect(CGImageDestinationFinalize(destination))
    }
}

/// Every family at its 46mm size, once with threads waiting and once with nothing waiting.
private struct ComplicationGallery: View {
    var waiting: WaitingEntry
    var waitingCount: Int
    var idle: WaitingEntry

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            section("\(waitingCount) waiting", waiting)
            section("Nothing waiting", idle)
        }
        .padding(.horizontal, 10)
        .padding(.top, 8)
        .foregroundStyle(.white)
    }

    private func section(_ title: String, _ entry: WaitingEntry) -> some View {
        VStack(alignment: .leading, spacing: 6) {
            Text(title.uppercased())
                .font(.system(size: 10, weight: .semibold, design: .rounded))
                .foregroundStyle(Theme.done)
            WaitingView(entry: entry, familyOverride: .accessoryInline)
                .font(.system(size: 13, weight: .semibold, design: .rounded))
                .frame(height: 18)
            WaitingView(entry: entry, familyOverride: .accessoryRectangular)
                .frame(width: 184, height: 72)
            HStack(spacing: 16) {
                // Outside a face AccessoryWidgetBackground fills a square; a face clips it round.
                WaitingView(entry: entry, familyOverride: .accessoryCircular)
                    .frame(width: 50, height: 50)
                    .clipShape(Circle())
                WaitingView(entry: entry, familyOverride: .accessoryCorner)
                    .frame(width: 50, height: 50)
            }
        }
    }
}