// 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 {
            try await gateway.respond(
                hostId: item.hostId, threadId: item.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, 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")
    }

    /// 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 idle: WaitingEntry

    var body: some View {
        VStack(alignment: .leading, spacing: 10) {
            section("3 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)
            }
        }
    }
}