-- ─────────────────────────────────────────────────────────────────────────────
--  Interaction system – proximity detection, key prompt
-- ─────────────────────────────────────────────────────────────────────────────

Interaction = {}

local _nearbyPC   = nil   -- current nearby PC config or nil
local _inSession  = false
local _camCfg     = nil   -- aktive PC-Kamera-Config (coords/heading) oder nil (mobil)
local _pcs        = {}    -- keyed by id, populated from server

-- Sync-Liste vom Server empfangen
RegisterNetEvent('pc-live:client:syncDevices', function(list)
    _pcs = {}
    for _, pc in ipairs(list) do
        pc.coords = vector3(pc.coords.x, pc.coords.y, pc.coords.z)
        _pcs[pc.id] = pc
    end
end)

-- Device-Liste beim Start anfordern
AddEventHandler('onClientResourceStart', function(res)
    if res == GetCurrentResourceName() then
        TriggerServerEvent('pc-live:server:requestDevices')
    end
end)

local function DrawText3D(x, y, z, text)
    local onScreen, sx, sy = World3dToScreen2d(x, y, z)
    if not onScreen then return end
    SetTextScale(0.0, 0.45)
    SetTextFont(4)
    SetTextProportional(1)
    SetTextColour(255, 255, 255, 215)
    SetTextEntry("STRING")
    SetTextCentre(true)
    AddTextComponentString(text)
    DrawText(sx, sy)
end

local function DrawRect2D(x, y, width, height, r, g, b, a)
    DrawRect(x, y, width, height, r, g, b, a)
end

--- Main proximity loop.
function Interaction.StartLoop()
    CreateThread(function()
        while true do
            local sleep = 1000
            if not _inSession then
                local ped    = PlayerPedId()
                local coords = GetEntityCoords(ped)

                local found = nil
                for _, pc in pairs(_pcs) do
                    local dist = #(coords - pc.coords)
                    if dist < Config.InteractRange + 8.0 then
                        sleep = 0
                        if dist < Config.InteractRange then
                            found = pc
                            break
                        end
                    end
                end
                _nearbyPC = found
            else
                _nearbyPC = nil
            end
            Wait(sleep)
        end
    end)
end

--- Draw prompt and handle key.
function Interaction.StartPromptLoop()
    CreateThread(function()
        while true do
            Wait(0)
            if _nearbyPC and not _inSession then
                -- Draw 3D label
                DrawText3D(
                    _nearbyPC.coords.x,
                    _nearbyPC.coords.y,
                    _nearbyPC.coords.z + 1.1,
                    ("[E] %s"):format(_nearbyPC.label)
                )

                if IsControlJustReleased(0, Config.InteractKey) then
                    Interaction.Open(_nearbyPC)
                end
            end
        end
    end)
end

--- Open PC – request session from server.
---@param pc table
function Interaction.Open(pc)
    if _inSession then return end
    TriggerServerEvent('pc-live:server:openPC', pc.id)
end

--- Called when the session starts (from server confirmation).
---@param data table
function Interaction.OnSessionStart(data)
    _inSession = true
    _nearbyPC  = nil

    -- PC-Config finden; mobile Terminals (Streifenwagen) haben keinen Standort/Kamera.
    local pcCfg
    for _, pc in ipairs(Config.PCs) do
        if pc.id == data.pcId then pcCfg = pc; break end
    end
    local isMobile = pcCfg and pcCfg.mobile

    if Config.FreezeOnOpen and not isMobile then
        FreezeEntityPosition(PlayerPedId(), true)
    end

    if pcCfg and not isMobile then
        _camCfg = { coords = pcCfg.coords, heading = pcCfg.heading }
        Camera.FocusPC(pcCfg.coords, pcCfg.heading)
    else
        _camCfg = nil
    end
end

-- Interaktionsmodus: PC-Kamera lösen (Gameplay-Kamera zurück -> umsehen möglich)
-- bzw. wieder auf den PC richten, wenn man zurückkehrt.
function Interaction.EnterInteract()
    if _camCfg then Camera.Restore() end
end
function Interaction.ExitInteract()
    if _camCfg then Camera.FocusPC(_camCfg.coords, _camCfg.heading) end
end

--- Öffnet ein mobiles Terminal (z.B. Streifenwagen-PC) – kein Standort/Distanz nötig.
---@param pcId string|nil
function Interaction.OpenMobile(pcId)
    if _inSession then return end
    TriggerServerEvent('pc-live:server:openPC', pcId or 'police_mobile')
end

-- Wird vom M-Menü (core-interaction) im Einsatzfahrzeug getriggert.
AddEventHandler('pc-live:openMobileTerminal', function(pcId)
    Interaction.OpenMobile(pcId)
end)

--- Called when closing the session.
function Interaction.OnSessionClose()
    _inSession = false

    if Config.FreezeOnOpen then
        FreezeEntityPosition(PlayerPedId(), false)
    end

    Camera.Restore()
    _camCfg = nil
    TriggerServerEvent('pc-live:server:closePC')
end

Interaction.StartLoop()
Interaction.StartPromptLoop()