import Foundation
import Testing
@testable import LocalData

@Suite(.serialized)
struct KeychainHelperTests {
    private let testService = "LocalDataTests.Keychain.\(UUID().uuidString)"
    private let keychain = MockKeychainHelper()
    
    // MARK: - Basic Round Trip
    
    @Test func keychainRoundTrip() async throws {
        let key = "test.credential"
        let data = Data("secret-password".utf8)
        
        defer {
            let k = keychain
            let s = testService
            Task { try? await k.delete(service: s, key: key) }
        }
        
        try await keychain.set(
            data,
            service: testService,
            key: key,
            accessibility: .afterFirstUnlock
        )
        
        let retrieved = try await keychain.get(service: testService, key: key)
        #expect(retrieved == data)
    }
    
    @Test func keychainNotFoundReturnsNil() async throws {
        let result = try await keychain.get(
            service: testService,
            key: "nonexistent.\(UUID().uuidString)"
        )
        #expect(result == nil)
    }
    
    @Test func keychainDeleteNonexistentDoesNotThrow() async throws {
        // Should not throw even if item doesn't exist
        try await keychain.delete(
            service: testService,
            key: "nonexistent.\(UUID().uuidString)"
        )
    }
    
    @Test func keychainExists() async throws {
        let key = "test.exists.\(UUID().uuidString)"
        let data = Data("test".utf8)
        
        defer {
            let k = keychain
            let s = testService
            Task { try? await k.delete(service: s, key: key) }
        }
        
        let beforeExists = try await keychain.exists(service: testService, key: key)
        #expect(beforeExists == false)
        
        try await keychain.set(
            data,
            service: testService,
            key: key,
            accessibility: .whenUnlocked
        )
        
        let afterExists = try await keychain.exists(service: testService, key: key)
        #expect(afterExists == true)
    }
    
    @Test func keychainUpdateReplacesData() async throws {
        let key = "test.update.\(UUID().uuidString)"
        let originalData = Data("original".utf8)
        let updatedData = Data("updated".utf8)
        
        defer {
            let k = keychain
            let s = testService
            Task { try? await k.delete(service: s, key: key) }
        }
        
        try await keychain.set(
            originalData,
            service: testService,
            key: key,
            accessibility: .afterFirstUnlock
        )
        
        try await keychain.set(
            updatedData,
            service: testService,
            key: key,
            accessibility: .afterFirstUnlock
        )
        
        let retrieved = try await keychain.get(service: testService, key: key)
        #expect(retrieved == updatedData)
    }
    
    @Test func keychainDeleteAll() async throws {
        let deleteAllService = "LocalDataTests.DeleteAll.\(UUID().uuidString)"
        let data = Data("test".utf8)
        
        // Create multiple items
        for i in 0..<3 {
            try await keychain.set(
                data,
                service: deleteAllService,
                key: "key\(i)",
                accessibility: .afterFirstUnlock
            )
        }
        
        // Verify they exist
        let exists0 = try await keychain.exists(service: deleteAllService, key: "key0")
        #expect(exists0 == true)
        
        // Delete all
        try await keychain.deleteAll(service: deleteAllService)
        
        // Verify they're gone
        for i in 0..<3 {
            let exists = try await keychain.exists(service: deleteAllService, key: "key\(i)")
            #expect(exists == false)
        }
    }
    
    // MARK: - Accessibility Options
    
    @Test(arguments: KeychainAccessibility.allCases)
    func keychainAccessibilityOptions(accessibility: KeychainAccessibility) async throws {
        let key = "test.accessibility.\(accessibility).\(UUID().uuidString)"
        let data = Data("data-for-\(accessibility)".utf8)
        
        defer {
            let k = keychain
            let s = testService
            Task { try? await k.delete(service: s, key: key) }
        }
        
        try await keychain.set(
            data,
            service: testService,
            key: key,
            accessibility: accessibility
        )
        
        let retrieved = try await keychain.get(service: testService, key: key)
        #expect(retrieved == data)
    }
}