package social.grain

import org.junit.Assert.assertFalse
import org.junit.Assert.assertTrue
import org.junit.Test
import social.grain.data.model.ActorViewerState
import social.grain.data.model.GrainProfileDetailed
import social.grain.feature.profile.ProfileUiState

/**
 * The two halves of a follow relationship are independent, and the profile
 * header reads both: `following` decides Follow versus Following, `followedBy`
 * decides the "Follows you" chip and whether the button says "Follow back".
 * Confusing them is easy and silently wrong in only one direction.
 */
class FollowRelationshipTest {

    private fun profileWith(following: String?, followedBy: String?) = ProfileUiState(
        did = "did:plc:them",
        viewerDid = "did:plc:me",
        profile = GrainProfileDetailed(
            did = "did:plc:them",
            handle = "them.test",
            viewer = ActorViewerState(following = following, followedBy = followedBy),
        ),
    )

    @Test
    fun `they follow me and I do not follow back`() {
        val state = profileWith(following = null, followedBy = "at://follow/1")
        assertTrue("chip should show", state.followsViewer)
        assertFalse("button should offer to follow", state.isFollowing)
    }

    @Test
    fun `I follow them and they do not follow me`() {
        val state = profileWith(following = "at://follow/2", followedBy = null)
        assertFalse("no chip — this is one-directional", state.followsViewer)
        assertTrue(state.isFollowing)
    }

    @Test
    fun `mutual follow shows the chip and the following state`() {
        val state = profileWith(following = "at://follow/3", followedBy = "at://follow/4")
        assertTrue(state.followsViewer)
        assertTrue(state.isFollowing)
    }

    @Test
    fun `no relationship shows neither`() {
        val state = profileWith(following = null, followedBy = null)
        assertFalse(state.followsViewer)
        assertFalse(state.isFollowing)
    }

    @Test
    fun `a profile that has not loaded claims no relationship`() {
        val state = ProfileUiState(did = "did:plc:them", viewerDid = "did:plc:me")
        assertFalse(state.followsViewer)
        assertFalse(state.isFollowing)
    }
}