import Foundation
import Testing

@testable import Haven

@Suite("API models")
struct ModelsTests {
  @Test("Wallpaper round-trips through Codable")
  func wallpaperCodableRoundTrip() throws {
    let wallpaper = makeWallpaper()

    let data = try JSONEncoder().encode(wallpaper)
    let decoded = try JSONDecoder().decode(Wallpaper.self, from: data)

    #expect(decoded.id == wallpaper.id)
    #expect(decoded.url == wallpaper.url)
    #expect(decoded.path == wallpaper.path)
    #expect(decoded.resolution == wallpaper.resolution)
    #expect(decoded.file_size == wallpaper.file_size)
    #expect(decoded.thumbs == wallpaper.thumbs)
  }

  @Test("Wallpaper identity equality is based on Wallhaven ID")
  func wallpaperEqualityUsesID() {
    let first = makeWallpaper(id: "same", path: "https://example.com/first.jpg")
    let second = makeWallpaper(id: "same", path: "https://example.com/second.jpg")
    let third = makeWallpaper(id: "different")

    #expect(first == second)
    #expect(first != third)
  }

  @Test("Optional API metadata may be absent")
  func responseWithoutMetadataDecodes() throws {
    let data = try JSONSerialization.data(withJSONObject: [
      "data": [
        [
          "id": "abc123",
          "url": "https://wallhaven.cc/w/abc123",
          "path": "https://w.wallhaven.cc/full/ab/wallhaven-abc123.jpg",
          "resolution": "1920x1080",
          "purity": "sfw",
          "thumbs": [
            "large": "https://example.com/large.jpg",
            "original": "https://example.com/original.jpg",
            "small": "https://example.com/small.jpg",
          ],
        ]
      ]
    ])

    let decoded = try JSONDecoder().decode(WallhavenResponse.self, from: data)

    #expect(decoded.data.count == 1)
    #expect(decoded.data[0].file_size == nil)
    #expect(decoded.meta == nil)
  }

  @Test("Metadata uses the API's snake-case keys")
  func metadataDecodesSnakeCaseKeys() throws {
    let data = Data(
      #"{"data":[],"meta":{"current_page":3,"last_page":7,"per_page":24,"total":150}}"#.utf8)

    let decoded = try JSONDecoder().decode(WallhavenResponse.self, from: data)

    #expect(decoded.meta?.current_page == 3)
    #expect(decoded.meta?.last_page == 7)
    #expect(decoded.meta?.per_page == 24)
    #expect(decoded.meta?.total == 150)
  }
}