--- @alias State "idle"|"run"|"attack"|"hurt"

--- @class Logic
--- @field id Id
--- @field mapLogic MapLogic
--- @field state State
local logic = {}
logic.__index = logic

--- @param id Id
--- @param position? Vec3
--- @param size? Vec3
local function new(id, position, size)
    return setmetatable({
        id = id,
        mapLogic = (require 'lib.character.map_logic').new(id, position, size),
        state = "idle"
    }, logic)
end

--- @param path Deque
function logic:followPath(path)
    if path:is_empty() then return end
    self.mapLogic.path = path;
    self:runTo(path:peek_front())
    path:pop_front()
end

--- @param target Vec3
function logic:runTo(target)
    self.mapLogic.t0 = love.timer.getTime()
    self.state = "run"
    self.mapLogic.runTarget = target
end

function logic:update(dt)
    if self.state == "run" and self.mapLogic.runTarget then
        local vel = self.mapLogic.runTarget:subtract(self.mapLogic.position) --[[@as Vec3]]
        local delta = love.timer.getTime() - self.mapLogic.t0 or love.timer.getTime()
        local fraction = delta / 0.5
        if fraction >= 1 then                         -- мы добежали до цели и сейчас в целевой клетке (возможно, промежуточной)
            self.mapLogic.position = self.mapLogic.runTarget
            if not self.mapLogic.path:is_empty() then -- еще есть, куда бежать
                self:runTo(self.mapLogic.path:peek_front())
                self.mapLogic.path:pop_front()
            else -- мы добежали до финальной цели
                self.state = "idle"
                self.mapLogic.runTarget = nil
            end
        else -- мы не добежали до цели
            self.mapLogic.displayedPosition = self.mapLogic.position:add(vel:scale(fraction))
        end
    end

    Tree.level.characterGrid:add(self.id)
end

return { new = new }