using System.Text;
using GeometryTD.Definition;
using GeometryTD.UI;

namespace GeometryTD.Procedure
{
    public static class ProcedureMainCombatEntryValidationService
    {
        public static ProcedureMainCombatEntryValidationResult Validate(BackpackInventoryData inventory)
        {
            if (inventory == null)
            {
                return new ProcedureMainCombatEntryValidationResult
                {
                    BlockReason = ProcedureMainCombatEntryBlockReason.InventoryUnavailable,
                    ValidationSummary = new CombatParticipantTowerValidationSummary()
                };
            }

            CombatParticipantTowerValidationSummary summary =
                CombatParticipantTowerValidationService.ValidateParticipantTowers(inventory);

            return new ProcedureMainCombatEntryValidationResult
            {
                BlockReason = summary.HasAnyValidParticipantTower
                    ? ProcedureMainCombatEntryBlockReason.None
                    : ProcedureMainCombatEntryBlockReason.NoValidParticipantTower,
                ValidationSummary = summary
            };
        }

        public static string BuildInvalidParticipantTowerLog(
            CombatParticipantTowerValidationSummary summary)
        {
            if (summary?.InvalidResults == null || summary.InvalidResults.Count <= 0)
            {
                return "none";
            }

            StringBuilder builder = new StringBuilder();
            for (int i = 0; i < summary.InvalidResults.Count; i++)
            {
                CombatParticipantTowerValidationResult result = summary.InvalidResults[i];
                if (result == null)
                {
                    continue;
                }

                if (builder.Length > 0)
                {
                    builder.Append(", ");
                }

                builder.Append('#');
                builder.Append(result.TowerInstanceId);
                builder.Append(':');
                builder.Append(result.FailureReason);
            }

            return builder.Length > 0 ? builder.ToString() : "none";
        }

        public static DialogFormRawData BuildBlockedCombatDialogRawData(
            ProcedureMainCombatEntryValidationResult validationResult)
        {
            return new DialogFormRawData
            {
                Mode = 1,
                Title = "无法进入战斗",
                Message = BuildBlockedCombatDialogMessage(validationResult),
                PauseGame = false,
                ConfirmText = "知道了"
            };
        }

        private static string BuildBlockedCombatDialogMessage(
            ProcedureMainCombatEntryValidationResult validationResult)
        {
            if (validationResult == null)
            {
                return "当前无法确认出战信息，请稍后重试。";
            }

            switch (validationResult.BlockReason)
            {
                case ProcedureMainCombatEntryBlockReason.InventoryUnavailable:
                    return "当前无法读取库存快照，暂时不能进入战斗。请重新进入本轮流程后再试。";
                case ProcedureMainCombatEntryBlockReason.NoValidParticipantTower:
                    return BuildNoValidParticipantTowerMessage(validationResult.ValidationSummary);
                default:
                    return "当前出战校验未通过，暂时不能进入战斗。";
            }
        }

        private static string BuildNoValidParticipantTowerMessage(
            CombatParticipantTowerValidationSummary summary)
        {
            if (summary?.InvalidResults == null || summary.InvalidResults.Count <= 0)
            {
                return "参战区至少需要 1 座完整装配了枪口、轴承、底座的塔，才能进入战斗。";
            }

            StringBuilder builder = new StringBuilder();
            builder.Append("参战区没有可出战的完整塔。");
            for (int i = 0; i < summary.InvalidResults.Count; i++)
            {
                CombatParticipantTowerValidationResult result = summary.InvalidResults[i];
                if (result == null)
                {
                    continue;
                }

                builder.Append('\n');
                builder.Append("塔 #");
                builder.Append(result.TowerInstanceId);
                builder.Append(' ');
                builder.Append(CombatParticipantTowerValidationText.GetFailureReasonMessage(result.FailureReason));
            }

            return builder.ToString();
        }
    }
}