feat: DTOs and interfaces

Services/Interfaces/IDialogueService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IDialogueService
+{
+    Task<Dialogue?> GetDialogueByMissionIdAsync(Guid missionId);
+    Task<Dialogue> CreateDialogueAsync(Dialogue dialogue);
+    Task<DialogueMessage?> GetDialogueMessageByIdAsync(Guid messageId);
+    Task<IEnumerable<DialogueMessageResponseOption>> GetResponseOptionsAsync(Guid messageId);
+    Task<DialogueMessage?> ProcessDialogueResponseAsync(Guid messageId, Guid responseOptionId, Guid playerId);
+}

Services/Interfaces/IMissionCategoryService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IMissionCategoryService
+{
+    Task<MissionCategory?> GetCategoryByIdAsync(Guid categoryId);
+    Task<MissionCategory?> GetCategoryByTitleAsync(string title);
+    Task<IEnumerable<MissionCategory>> GetAllCategoriesAsync();
+    Task<MissionCategory> CreateCategoryAsync(MissionCategory category);
+    Task<MissionCategory> UpdateCategoryAsync(MissionCategory category);
+    Task<bool> DeleteCategoryAsync(Guid categoryId);
+}

Services/Interfaces/IMissionService.cs

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+using GamificationService.Models.Database;
+using GamificationService.Models.DTO;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IMissionService
+{
+    Task<Mission?> GetMissionByIdAsync(Guid missionId);
+    Task<IEnumerable<Mission>> GetMissionsByCategoryAsync(Guid categoryId);
+    Task<IEnumerable<Mission>> GetAvailableMissionsForPlayerAsync(Guid playerId);
+    Task<IEnumerable<Mission>> GetChildMissionsAsync(Guid parentMissionId);
+    Task<Mission> CreateMissionAsync(Mission mission);
+    Task<Mission> UpdateMissionAsync(Mission mission);
+    Task<bool> DeleteMissionAsync(Guid missionId);
+    Task<bool> IsMissionAvailableForPlayerAsync(Guid missionId, Guid playerId);
+    Task<MissionCompletionResult> CompleteMissionAsync(Guid missionId, Guid playerId, object? missionProof = null);
+}

Services/Interfaces/IPlayerService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IPlayerService
+{
+    Task<Player?> GetPlayerByUserIdAsync(string userId);
+    Task<Player> CreatePlayerAsync(string userId, string username);
+    Task<Player> UpdatePlayerRankAsync(Guid playerId, Guid newRankId);
+    Task<Player> AddPlayerExperienceAsync(Guid playerId, int experience);
+    Task<Player> AddPlayerManaAsync(Guid playerId, int mana);
+    Task<IEnumerable<Player>> GetTopPlayersAsync(int topCount, TimeSpan timeFrame);
+    Task<Player> GetPlayerWithProgressAsync(Guid playerId);
+}

Services/Interfaces/IProgressTrackingService.cs

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+using GamificationService.Models.Database;
+using GamificationService.Models.DTO;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IProgressTrackingService
+{
+    Task<PlayerMission> StartMissionAsync(Guid missionId, Guid playerId);
+    Task<PlayerMission> UpdateMissionProgressAsync(Guid playerMissionId, int progressPercentage, object? proof = null);
+    Task<PlayerMission> CompleteMissionAsync(Guid playerMissionId, object? proof = null);
+    Task<IEnumerable<PlayerMission>> GetPlayerMissionsAsync(Guid playerId);
+    Task<PlayerMission?> GetPlayerMissionAsync(Guid playerId, Guid missionId);
+    Task<PlayerProgress> GetPlayerOverallProgressAsync(Guid playerId);
+}

Services/Interfaces/IRankService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IRankService
+{
+    Task<Rank?> GetRankByIdAsync(Guid rankId);
+    Task<Rank?> GetRankByTitleAsync(string title);
+    Task<IEnumerable<Rank>> GetAllRanksAsync();
+    Task<Rank> CreateRankAsync(Rank rank);
+    Task<Rank> UpdateRankAsync(Rank rank);
+    Task<bool> DeleteRankAsync(Guid rankId);
+    Task<bool> CanPlayerAdvanceToRankAsync(Guid playerId, Guid rankId);
+    Task<Rank?> GetNextRankAsync(Guid currentRankId);
+}

Services/Interfaces/IRewardService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IRewardService
+{
+    Task<IEnumerable<MissionSkillReward>> GetMissionSkillRewardsAsync(Guid missionId);
+    Task<IEnumerable<MissionItemReward>> GetMissionItemRewardsAsync(Guid missionId);
+    Task DistributeMissionRewardsAsync(Guid missionId, Guid playerId);
+    Task<bool> CanClaimRewardAsync(Guid rewardId, Guid playerId);
+}

Services/Interfaces/IRuleValidationService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface IRuleValidationService
+{
+    Task<bool> ValidateMissionRankRulesAsync(Guid missionId, Guid playerId);
+    Task<bool> ValidateRankAdvancementRulesAsync(Guid playerId, Guid targetRankId);
+    Task<IEnumerable<MissionRankRule>> GetApplicableRankRulesAsync(Guid missionId);
+}

Services/Interfaces/ISkillService.cs

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+using GamificationService.Models.Database;
+
+namespace GamificationService.Services.Interfaces;
+
+public interface ISkillService
+{
+    Task<Skill?> GetSkillByIdAsync(Guid skillId);
+    Task<Skill?> GetSkillByTitleAsync(string title);
+    Task<IEnumerable<Skill>> GetAllSkillsAsync();
+    Task<Skill> CreateSkillAsync(Skill skill);
+    Task<Skill> UpdateSkillAsync(Skill skill);
+    Task<bool> DeleteSkillAsync(Guid skillId);
+    Task<PlayerSkill> UpdatePlayerSkillAsync(Guid playerId, Guid skillId, int level);
+    Task<IEnumerable<PlayerSkill>> GetPlayerSkillsAsync(Guid playerId);
+    Task<int> GetPlayerSkillLevelAsync(Guid playerId, Guid skillId);
+}