feat: 대표 펫 변경 api를 개발한다

src/main/kotlin/org/gitanimals/guild/app/ChangeMainPersonaFacade.kt

@@ -0,0 +1,27 @@
+package org.gitanimals.guild.app
+
+import org.gitanimals.guild.domain.GuildService
+import org.springframework.stereotype.Component
+
+@Component
+class ChangeMainPersonaFacade(
+    private val renderApi: RenderApi,
+    private val identityApi: IdentityApi,
+    private val guildService: GuildService,
+) {
+
+    fun changeMainPersona(token: String, guildId: Long, personaId: Long) {
+        val user = identityApi.getUserByToken(token)
+        val personas = renderApi.getUserByName(user.username).personas
+
+        val changedPersona = personas.firstOrNull { it.id.toLong() == personaId }
+            ?: throw IllegalArgumentException("Cannot change persona to \"$personaId\" from user \"${user.username}\"")
+
+        guildService.changeMainPersona(
+            guildId = guildId,
+            userId = user.id.toLong(),
+            personaId = changedPersona.id.toLong(),
+            personaType = changedPersona.type,
+        )
+    }
+}

src/main/kotlin/org/gitanimals/guild/controller/GuildController.kt

@@ -25,6 +25,7 @@ class GuildController(
     private val changeGuildFacade: ChangeGuildFacade,
     private val joinedGuildFacade: GetJoinedGuildFacade,
     private val searchGuildFacade: SearchGuildFacade,
+    private val changeMainPersonaFacade: ChangeMainPersonaFacade,
 ) {
 
     @ResponseStatus(HttpStatus.OK)
@@ -116,4 +117,15 @@ class GuildController(
             GuildIcons.entries.map { it.getImagePath() }.toList()
         )
     }
+
+    @PostMapping("/guilds/{guildId}/personas")
+    fun changeMainPersona(
+        @RequestHeader(HttpHeaders.AUTHORIZATION) token: String,
+        @PathVariable("guildId") guildId: Long,
+        @RequestParam("persona-id") personaId: Long,
+    ) = changeMainPersonaFacade.changeMainPersona(
+        token = token,
+        guildId = guildId,
+        personaId = personaId,
+    )
 }

src/main/kotlin/org/gitanimals/guild/domain/Guild.kt

@@ -187,6 +187,21 @@ class Guild(
         return leader.personaType
     }
 
+    fun changeMainPersona(userId: Long, personaId: Long, personaType: String) {
+        if (leader.userId == userId) {
+            leader.personaId = personaId
+            leader.personaType = personaType
+            return
+        }
+
+        members.first {
+            it.userId == userId
+        }.run {
+            this.personaId = personaId
+            this.personaType = personaType
+        }
+    }
+
     companion object {
 
         fun create(

src/main/kotlin/org/gitanimals/guild/domain/GuildService.kt

@@ -94,6 +94,13 @@ class GuildService(
         guild.change(request)
     }
 
+    @Transactional
+    fun changeMainPersona(guildId: Long, userId: Long, personaId: Long, personaType: String) {
+        val guild = getGuildById(guildId)
+
+        guild.changeMainPersona(userId, personaId, personaType)
+    }
+
     fun getGuildById(id: Long, vararg lazyLoading: (Guild) -> Unit): Guild {
         val guild = guildRepository.findByIdOrNull(id)
             ?: throw IllegalArgumentException("Cannot fint guild by id \"$id\"")