local debug = false
local iconDisplayDuration = 3

---@param container number
---@param slot number
---@return string, string|nil
local function getItemLink(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local link = select(7, GetContainerItemInfo(container, slot))
    if link == nil then return "", string.format("GetContainerItemInfo returned nil for link (arg 7)") end
    return link
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemQuantity(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local quantity = select(2, GetContainerItemInfo(container, slot))
    if quantity == nil then
        return "",
            string.format("GetContainerItemInfo returned nil for quantity (arg 2)")
    end
    return quantity
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemName(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local name = select(1, GetItemInfo(getItemLink(container, slot)))
    if name == nil then return "", string.format("GetItemInfo returned nil for name (arg 1)") end
    return name
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemType(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local type = select(6, GetItemInfo(getItemLink(container, slot)))
    if type == nil then return "", string.format("GetItemInfo returned nil for type (arg 6)") end
    return type
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemSubtype(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local subtype = select(7, GetItemInfo(getItemLink(container, slot)))
    if subtype == nil then return "", string.format("GetItemInfo returned nil for subtype (arg 7)") end
    return subtype
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemLevel(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local level = select(4, GetItemInfo(getItemLink(container, slot)))
    if level == nil then return "", string.format("GetItemInfo returned nil for level (arg 4)") end
    return level
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemValue(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local value = select(11, GetItemInfo(getItemLink(container, slot)))
    if value == nil then return "", string.format("GetItemInfo returned nil for value (arg 11)") end
    return value
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemQuality(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local quality = select(3, GetItemInfo(getItemLink(container, slot)))
    if quality == nil then return "", string.format("GetItemInfo returned nil for quality (arg 3)") end
    return quality
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemEquipLocation(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local equipLoc = select(9, GetItemInfo(getItemLink(container, slot)))
    if equipLoc == nil then return "", string.format("GetItemInfo returned nil for equipLoc (arg 9)") end
    return equipLoc
end
---@param container number
---@param slot number
---@return string, string|nil
local function getItemIcon(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local icon = select(10, GetItemInfo(getItemLink(container, slot)))
    if icon == nil then return "", string.format("GetItemInfo returned nil for icon (arg 10)") end
    return icon
end
---@param container number
---@param slot number
---@return string, string|nil
local function getBindType(container, slot)
    if container == nil then return "", string.format("Container is nil") end
    if slot == nil then return "", string.format("Slot is nil") end
    local bindType = select(14, GetItemInfo(getItemLink(container, slot)))
    if bindType == nil then return "", string.format("GetItemInfo returned nil for bindType (arg 14)") end
    return bindType
end

---@class Filter
---@field requires table<string, fun(container:number, slot: number): string|number|boolean> | nil
---@field filter fun(container: number, slot: number, provided: table<string, string|number|boolean>): boolean
Filter = {
    ---@param requires table<string, fun(container:number, slot: number): string|number|boolean> | nil
    ---@param filter fun(container: number, slot: number, provided: table<string, string|number|boolean>): boolean
    ---@return Filter
    new = function(requires, filter)
        local self = setmetatable({}, {
            __index = Filter
        })
        self.requires = requires
        self.filter = filter
        return self
    end,

    ---@param self Filter
    ---@param container number
    ---@param slot number
    ---@return boolean, string|nil
    Run = function(self, container, slot)
        ---@type table<string, string|number|boolean>
        local provided = {}
        if self.requires then
            for k, v in pairs(self.requires) do
                local res, err = v(container, slot)
                if err then
                    if debug then print(err) end
                    return false, err
                end
                provided[k] = res
            end
        end
        local res, err = self.filter(container, slot, provided)
        if err then
            if debug then print(err) end
        end
        return res, nil
    end
}

local grayFilter = Filter.new({
        ["quality"] = getItemQuality
    },
    function(container, slot, provided)
        if not aura_env.config.grayFilter then return false end
        if provided.quality == 0 then
            return true
        end
        return false
    end)
local gearFilter = Filter.new({
        ["ilvl"] = getItemLevel,
        ["bindType"] = getBindType,
        ["type"] = getItemType,
        ["equipLoc"] = getItemEquipLocation
    },
    function(container, slot, provided)
        if not aura_env.config.gearFilter then return false end
        local ilvlThreshold = aura_env.config.gearFilterIlvlFilterThreshold
        local sellBoe = aura_env.config.gearFilterSellBoe

        if provided.type == "Armor"
            or provided.type == "Weapon"
            or provided.equipLoc == "INVTYPE_FINGER"
            or provided.equipLoc == "INVTYPE_TRINKET"
            or provided.equipLoc == "INVTYPE_CLOAK"
            or provided.equipLoc == "INVTYPE_NECK" then
            if provided.ilvl < ilvlThreshold and (provided.bindType == 1 or sellBoe) then
                return true
            end
        end
        return false
    end)

---@param container number
---@param slot number
---@return nil, string|nil
local function doSell(container, slot)
    local itemIcon, err = getItemIcon(container, slot)
    if err then return nil, string.format("Error getting item icon: %s", err) end
    local itemName, err = getItemName(container, slot)
    if err then return nil, string.format("Error getting item name: %s", err) end
    local itemQuantity, err = getItemQuantity(container, slot)
    if err then return nil, string.format("Error getting item quantity: %s", err) end
    local itemQuality, err = getItemQuality(container, slot)
    if err then return nil, string.format("Error getting item quality: %s", err) end

    local nameWithColor = string.format("%s[%s]\124r", aura_env.qualityColors[itemQuality + 1], itemName)
    local nameWithQuantity = string.format("%s x%s", nameWithColor, itemQuantity)

    aura_env.allstates[#aura_env.allstates + 1] = {
        show = true,
        changed = true,
        index = GetTime(),
        resort = true,

        icon = itemIcon,
        name = nameWithQuantity,
        amount = itemQuantity,

        progressType = "timed",
        expirationTime = GetTime() + iconDisplayDuration,
        duration = iconDisplayDuration,
        autoHide = true,
    }

    UseContainerItem(container, slot)
    return nil, nil
end

---@type table<Filter>
local filters = {
    grayFilter,
    gearFilter
}

---@class FilterService
aura_env.FilterService = {
    ---@param container number
    ---@param slot number
    ---@return nil, nil
    Run = function(container, slot)
        local itemLink, err = getItemLink(container, slot)
        if err then return nil, string.format("Err: slot empty (%d-%d) - %s", container, slot, err) end
        for k, filter in pairs(filters) do
            local res, err = filter:Run(container, slot)
            if err then
                if debug then print(err) end
            else
                if res then
                    doSell(container, slot)
                    return
                end
            end
        end
    end,
}

aura_env.qualityColors = {
    "\124cff9d9d9d", -- Poor
    "\124cffffffff", -- Common
    "\124cff1eff00", -- Uncommon
    "\124cff0070dd", -- Rare
    "\124cffa335ee", -- Epic
    "\124cffff8000", -- Legendary
    "\124cffe6cc80", -- Artifact
    "\124cff00ccff", -- Heirloom
}