using System;
using System.Collections.Generic;
using System.Text;
using Cielonos.MainGame.Characters;
using Sirenix.OdinInspector;
using UnityEngine;

namespace Cielonos.MainGame.Inventory
{
    public enum PlayerEquipmentInputType
    {
        MainWeaponPrimary,
        MainWeaponSecondary,
        MainWeaponSpecialA,
        MainWeaponSpecialB,
        MainWeaponSpecialC,
        SupportEquipment0,
        SupportEquipment1,
        SupportEquipment2,
        SupportEquipment3
    }

    public readonly struct PlayerEquipmentInputContext
    {
        public readonly PlayerEquipmentInputType inputType;
        public readonly List<PlayerInputModifierType> modifiers;
        public readonly int supportSlotIndex;

        public PlayerEquipmentInputContext(PlayerEquipmentInputType inputType, List<PlayerInputModifierType> modifiers, int supportSlotIndex = -1)
        {
            this.inputType = inputType;
            this.modifiers = modifiers;
            this.supportSlotIndex = supportSlotIndex;
        }
    }

    [Serializable]
    public class EquipmentInputRule
    {
        public string name;
        
        [HorizontalGroup("Rule", Width = 0.4f)]
        [HideLabel]
        public PlayerEquipmentInputType inputType;

        [HorizontalGroup("Rule", Width = 0.2f)]
        [LabelText("Preinput")]
        public bool registerPreinput = true;

        [HorizontalGroup("Rule", Width = 0.2f)]
        [LabelText("Priority")]
        [EnableIf(nameof(registerPreinput))]
        public int preinputPriority;
        
        [LabelText("Modifier Conditions")]
        [ListDrawerSettings(ShowFoldout = true, DraggableItems = true, AddCopiesLastElement = true)]
        public List<InputModifierCondition> modifierConditions = new();

        public bool Matches(PlayerEquipmentInputContext context)
        {
            if (inputType != context.inputType) return false;

            foreach (InputModifierCondition condition in modifierConditions)
            {
                if (condition == null) continue;
                if (!condition.Matches(context.modifiers)) return false;
            }

            return true;
        }

        public int Specificity
        {
            get
            {
                HashSet<PlayerInputModifierType> modifierTypes = new();

                foreach (InputModifierCondition condition in modifierConditions)
                {
                    if (condition == null) continue;
                    modifierTypes.Add(condition.modifierType);
                }

                return modifierTypes.Count;
            }
        }
    }

    [CreateAssetMenu(fileName = "InputData", menuName = "Cielonos/Items/Input Data")]
    public class InputData : ScriptableObject
    {
        [InfoBox("$HighPriorityWarningMessage", InfoMessageType.Warning, nameof(HasRuleAboveDashDodgePriority))]
        [ListDrawerSettings(ShowFoldout = true, DraggableItems = true, 
            AddCopiesLastElement = true, ListElementLabelName = "name")]
        public List<EquipmentInputRule> rules = new();
        
        public bool TryGetPreinputPriority(PlayerEquipmentInputContext context, out int priority)
        {
            EquipmentInputRule bestRule = null;
            int bestSpecificity = -1;

            foreach (EquipmentInputRule rule in rules)
            {
                if (rule == null || !rule.Matches(context)) continue;

                int specificity = rule.Specificity;
                if (specificity >= bestSpecificity)
                {
                    bestRule = rule;
                    bestSpecificity = specificity;
                }
            }

            if (bestRule is not { registerPreinput: true })
            {
                priority = 0;
                return false;
            }

            priority = bestRule.preinputPriority;
            return true;
        }

        private bool HasRuleAboveDashDodgePriority()
        {
            if (rules == null) return false;

            foreach (EquipmentInputRule rule in rules)
            {
                if (rule is not { registerPreinput: true }) continue;
                if (rule.preinputPriority > PlayerInputSubcontroller.PlayerPreinputSubmodule.DashDodgePreinputPriority) return true;
            }

            return false;
        }

        private string HighPriorityWarningMessage
        {
            get
            {
                StringBuilder builder = new("以下 Input Rule 的优先级高于 Dash/Dodge (100)：");
                bool hasRule = false;

                if (rules != null)
                {
                    foreach (EquipmentInputRule rule in rules)
                    {
                        if (rule is not { registerPreinput: true }) continue;
                        if (rule.preinputPriority <= PlayerInputSubcontroller.PlayerPreinputSubmodule.DashDodgePreinputPriority) continue;

                        if (hasRule) builder.Append("、");
                        builder.Append(string.IsNullOrWhiteSpace(rule.name) ? rule.inputType.ToString() : rule.name);
                        hasRule = true;
                    }
                }

                if (!hasRule) return string.Empty;
                builder.Append("。请确认这些输入确实应该高于 Dash/Dodge。");
                return builder.ToString();
            }
        }
    }
}