import Foundation
import Testing
import IndieSync
@testable import Workouts

/// Round-trips `SplitDocument` through `DocumentCoder` — the exact JSON codec
/// (ISO-8601 dates, sorted keys, pretty-printed) `DocumentFileStore` uses to
/// write and read every document in this app's iCloud container.
struct SplitDocumentCodableTests {
    /// A whole-second epoch so ISO-8601 round-trips (no fractional-second loss).
    private static let stableTimestamp = Date(timeIntervalSince1970: 1_700_000_000)

    @Test func encodeDecodeRoundTrip() throws {
        let exercise = ExerciseDocument(
            id: ULID.make(),
            name: "Bench Press",
            order: 0,
            sets: 4,
            reps: 10,
            weight: 135,
            loadType: 0,
            durationSeconds: 0,
            weightLastUpdated: Self.stableTimestamp,
            weightReminderWeeks: 4,
            category: ExerciseCategory.warmup.rawValue
        )
        let original = SplitDocument(
            schemaVersion: SplitDocument.currentSchemaVersion,
            id: ULID.make(),
            name: "Push Day",
            color: "blue",
            systemImage: "dumbbell.fill",
            order: 0,
            createdAt: Self.stableTimestamp,
            updatedAt: Self.stableTimestamp,
            exercises: [exercise],
            activityType: nil
        )

        let data = try DocumentCoder.encode(original)
        let decoded = try DocumentCoder.decode(SplitDocument.self, from: data)

        #expect(decoded == original)
        #expect(decoded.relativePath == "Splits/\(original.id).json")
    }

    /// A pre-category exercise (no `category` key) must still decode — the field is
    /// optional and deliberately not schema-bumped, defaulting to the main circuit.
    @Test func decodesLegacyExerciseWithoutCategory() throws {
        let json = """
        {
            "schemaVersion": 1,
            "id": "01HZZZZZZZZZZZZZZZZZZZZZZZ",
            "name": "Push Day",
            "color": "blue",
            "systemImage": "dumbbell.fill",
            "order": 0,
            "createdAt": "2023-11-14T22:13:20Z",
            "updatedAt": "2023-11-14T22:13:20Z",
            "exercises": [{
                "id": "01HZZZZZZZZZZZZZZZZZZZZZZY",
                "name": "Bench Press",
                "order": 0,
                "sets": 4,
                "reps": 10,
                "weight": 135,
                "loadType": 1,
                "durationSeconds": 0,
                "weightReminderWeeks": 4
            }]
        }
        """
        let decoded = try DocumentCoder.decode(SplitDocument.self, from: Data(json.utf8))
        #expect(decoded.exercises.first?.category == nil)
    }
}