---@class SkillSystemComponent

local SkillSystemComponent = LuaClass("SkillSystemComponent")

SkillSystemComponent.OwnerChatacter = nil

--- 存储所有玩家拥有过的技能实例
---@type table<ESkillName, SimpleSkill[]>
SkillSystemComponent.SkillsMap = {}

--- 记录技能与槽位间的匹配信息
---@type table<ESkillSlot, SimpleSkill>
SkillSystemComponent.SlotToSkillList = {}


function SkillSystemComponent:ctor(OwnerActor)
    self.Owner = OwnerActor
end

function SkillSystemComponent:OnTick(DeltaTime)
    --- Skill的Tick
    for _, SimpleSkill in pairs(self.SlotToSkillList) do
        if SimpleSkill ~= nil then
            SimpleSkill:OnTick(DeltaTime)
        end
    end
end

------------------------------------------------ Skill 相关 ------------------------------------------------
---@param SkillNameList ESkillName[]
function SkillSystemComponent:GiveSkillWithList(SkillNameList)
    for k, SkillName in pairs(SkillNameList) do
        self:GiveSkill(SkillName)
    end
end

---@param SkillName ESkillName
---@param SkillSlot ESkillSlot
---@param SkillLevel int
---@return SkillItemID
function SkillSystemComponent:GiveSkill(SkillName, SkillSlot, SkillLevel)
    if not UGCGameSystem.IsServer() then
        UE.Log("[SkillSystemComponent:GiveSkill] 未在服务端调用")
        return -1
    end

    local SkillDat = GameDataManager.GetSkillData(SkillName)
    if SkillDat == nil then
        UE.Log("[SkillSystemComponent:GiveSkill] 配置表中无此技能: %s", tostring(SkillName))
        return -1
    end
    
    if SkillSlot == nil then
        local AvaliableSlot = self:GetSkillAvaliableSlot(SkillDat.SkillAccess)
        if AvaliableSlot == nil then
            UE.Log("[SkillSystemComponent:GiveSkill] 无可用技能插槽,需指定")
            return -1
        else
            SkillSlot = AvaliableSlot
        end
    elseif SkillSlot < ESkillSlot.Slot0 or SkillSlot > ESkillSlot.Slot4 then
        UE.Log("[SkillSystemComponent:GiveSkill] 技能插槽非法: %s", tostring(SkillSlot))
        return -1
    end
    
    ---无指定技能等级则默认为1级技能
    if SkillLevel == nil or SkillLevel <= 0 then
        SkillLevel = 1
    end
        
    ---验证是否有相同的技能,即名字相同且等级相同,此时插槽视为无效
    local OwnedSkills = self.SkillsMap[SkillName]
    if OwnedSkills ~= nil and table.getCount(OwnedSkills) > 0 then
        for _, SimpleSkill in pairs(OwnedSkills) do
            if SimpleSkill.SkillLevel == SkillLevel then
                UE.Log("[SkillSystemComponent:GiveSkill] 相同技能已存在: Skill=%d, Level=%d", SkillName, SkillLevel)
                return -1
            end
        end
    end

    for Slot, SkillInfo in pairs(self.Owner.Controller.ActiveSkillNameList) do
        if SkillInfo.SkillName == SkillName then
            if Slot == SkillSlot then
                if SkillLevel ~= SkillInfo.SkillLevel then
                    ---同名技能若在同一插槽且等级不同,则进行替换操作
                    local CurSkill = self.SlotToSkillList[Slot]
                    local CurSkillItemID = CurSkill:GetSkillItemID()
                    CurSkill:SetSkillLevel(SkillLevel)
    
                    self.Owner.Controller.ActiveSkillNameList[Slot] = {SkillName = SkillName, SkillLevel = SkillLevel}
                    UnrealNetwork.CallUnrealRPC(self.Owner.Controller, self.Owner.Controller, "ClientRPC_SetupSkillButton",  SkillName, SkillSlot, SkillLevel)      --TODO:后期还需加上等级
    
                    UE.Log("[SkillSystemComponent:GiveSkill] 更新技能slot=%d", SkillSlot)

                    ---返回已有技能的ID
                    return CurSkillItemID
                else
                    ---同名技能不在同一插槽且等级不同,则进行普通添加技能流程
                end
            end
        end
    end

    local CurSkillItemID = 0
    local CurSkill = self:GetSkillBySlot(SkillSlot)
    if CurSkill ~= nil then
        CurSkillItemID = CurSkill:GetSkillItemID()
        self:RemoveSkillBySlot(SkillSlot)          --TODO:移除流程
    end

    -- 新的技能实例
    local SimpleSkill = require("Script.SimpleSkill.SimpleSkill")
    local Skill = SimpleSkill.New(self.Owner)

    Skill.SkillName = SkillName
    Skill:SetSkillLevel(SkillLevel)
    Skill:InitConfig(SkillDat)

    self:AddSkillToMap(SkillName, Skill)
    self.SlotToSkillList[SkillSlot] = Skill

    --将Slot-SkillName对应关系写入PlayerController
    self.Owner.Controller.ActiveSkillNameList[SkillSlot] = {SkillName = SkillName, SkillLevel = SkillLevel}

    UnrealNetwork.CallUnrealRPC(self.Owner.Controller, self.Owner.Controller, "ClientRPC_SetupSkillButton",  SkillName, SkillSlot, SkillLevel)
    UnrealNetwork.CallUnrealRPC(self.Owner.Controller, self.Owner.Controller, "ClientRPC_SetSkillCD",  SkillSlot, 0.1)

    UE.Log("[SkillSystemComponent:GiveSkill] AddSimpleSkill OwnerPawn:%d SkillName:%d", self.Owner.PlayerKey, SkillName)
    
    return CurSkillItemID
end

---@param SkillAccessType ESkillAccessType
function SkillSystemComponent:GetSkillAvaliableSlot(SkillAccessType)
    if SkillAccessType == ESkillAccessType.Acquired then
        for i = ESkillSlot.Slot1, ESkillSlot.Slot3 do
            if self:GetSkillBySlot(i) == nil then
                return i
            end
        end
    elseif SkillAccessType == ESkillAccessType.Talented then
        return ESkillSlot.Slot0
    elseif SkillAccessType == ESkillAccessType.BuiltIn then
        return ESkillSlot.Slot4
    end

    return nil
end

---@param SkillSlot ESkillSlot
---@return SimpleSkill
function SkillSystemComponent:GetSkillBySlot(SkillSlot)
    return self.SlotToSkillList[SkillSlot]
end

---@param SkillName ESkillName
---@param SimpleSkill SimpleSkill
function SkillSystemComponent:AddSkillToMap(SkillName, SimpleSkill)
    if self.SkillsMap[SkillName] == nil then
        self.SkillsMap[SkillName] = {}
    end
    table.insert(self.SkillsMap[SkillName], SimpleSkill)
end

---@param SimpleSkill SimpleSkill
function SkillSystemComponent:RemoveSkill(SimpleSkill)
    if SimpleSkill == nil then
        UE.Log("[SkillSystemComponent:RemoveSkill] invalid Skill!")
        return -1
    end

    SimpleSkill:EndSkill()

    for SkillName, Skills in pairs(self.SkillsMap) do
        for index, SkillInst in pairs(Skills) do
            if SkillInst == SimpleSkill then
                self.SkillsMap[SkillName][index] = nil
                break
            end
        end
    end

    for Slot, SkillInst in pairs(self.SlotToSkillList) do
        if SkillInst == SimpleSkill then
            self.SlotToSkillList[Slot] = nil
        end
    end

    local RemovedSkillItemID = SimpleSkill:GetSkillItemID()
    SimpleSkill = nil

    UE.Log("[SkillSystemComponent:RemoveSkillBySlot] Remove Success!")
    
    return RemovedSkillItemID
end

---@param SkillName ESkillName
function SkillSystemComponent:RemoveSkillBySlot(SkillSlot)
    local CurSkill = self.SlotToSkillList[SkillSlot]
    if CurSkill == nil then
        UE.Log("[SkillSystemComponent:RemoveSkillBySlot] invalid SkillSlot! OwnerPawn:%d SkillSlot:%d", self.Owner.PlayerKey, SkillSlot)
        return -1
    end

    local RemovedSkillItemID = CurSkill:GetSkillItemID()
    CurSkill:EndSkill()
    
    for SkillName, Skills in pairs(self.SkillsMap) do
        for index, SkillInst in pairs(Skills) do
            if SkillInst == CurSkill then
                self.SkillsMap[SkillName][index] = nil
                break
            end
        end
    end
    
    self.SlotToSkillList[SkillSlot] = nil

    UE.Log("[SkillSystemComponent:RemoveSkillBySlot] RemoveSimpleSkill OwnerPawn:%d SkillSlot:%d", self.Owner.PlayerKey, SkillSlot)
    
    return RemovedSkillItemID
end

function SkillSystemComponent:RemoveAllSkill()
    for _, SimpleSkill in pairs(self.SlotToSkillList) do
        SimpleSkill:EndSkill()
    end
    self.SkillsMap = nil
    self.SlotToSkillList = nil
end

---@param SkillSlot ESkillSlot
function SkillSystemComponent:TryActiveSkillBySlot(SkillSlot)
    local SkillInst = self.SlotToSkillList[SkillSlot]
    if SkillInst == nil then
        UE.Log("[SkillSystemComponent:TryActiveSkillBySlot] invalid SkillSlot[%d]", SkillSlot)
        return
    end
    
    if not SkillInst:IsReadyToCastSkill() then
        UE.Log("[SkillSystemComponent:TryActiveSkillBySlot] Skill[%d] is not ready", SkillInst.SkillName)
        return
    end
    
    UnrealNetwork.CallUnrealRPC(self.Owner.Controller, self.Owner.Controller, "ClientRPC_SetSkillCD",  SkillSlot, SkillInst.CoolDownDuration)
    
    SkillInst:CastSkill()
    UE.Log("[SkillSystemComponent:TryActiveSkillBySlot] ActiveSimpleSkill SkillSlot:%d, SkillName:%d", SkillSlot, SkillInst.SkillName)
end

--- 外部传入技能目标
---@param SkillName ESkillName
---@param TargetPawnsList UGCPlayerPawn[]
function SkillSystemComponent:SetTargetPawnsToSkill(SkillName, TargetPawnsList)
    local CurSkill = self.SkillsMap[SkillName]
    if SkillName ~= nil and CurSkill ~= nil then
        CurSkill.TargetActors = {}
        CurSkill.TargetPawns = TargetPawnsList
    end
end

return SkillSystemComponent;