local angleY = 0.0
local angleZ = 0.0
local cam = nil
local running = false
local gEntity = nil
local gRadius = nil
local gRadiusMax = nil
local gRadiusMin = nil
local scaleform = nil
local scrollIncrements = nil
local isFirstPersonView = false

local function cos(degrees)
    return math.cos(math.rad(degrees))
end

local function sin(degrees)
    return math.sin(math.rad(degrees))
end

local function setCamPosition()
    local entityCoords = GetEntityCoords(gEntity)
    local mouseX = GetDisabledControlNormal(0, 1) * 8.0 -- 8x multiplier to make it more sensitive
    local mouseY = GetDisabledControlNormal(0, 2) * 8.0

    angleZ = angleZ - mouseX -- left / right
    angleY = angleY + mouseY -- up / down
    angleY = lib.math.clamp(angleY, 0.0, 89.0) -- >=90 degrees will flip the camera, < 0 is underground

    local cosAngleZ = cos(angleZ)
    local cosAngleY = cos(angleY)
    local sinAngleZ = sin(angleZ)
    local sinAngleY = sin(angleY)

    local offset = vec3(
        ((cosAngleZ * cosAngleY) + (cosAngleY * cosAngleZ)) / 2 * gRadius,
        ((sinAngleZ * cosAngleY) + (cosAngleY * sinAngleZ)) / 2 * gRadius,
        ((sinAngleY)) * gRadius
    )

    local camPos = vec3(entityCoords.x + offset.x, entityCoords.y + offset.y, entityCoords.z + offset.z)
    SetCamCoord(cam, camPos.x, camPos.y, camPos.z)
    PointCamAtCoord(cam, entityCoords.x, entityCoords.y, entityCoords.z + 0.5)
end

local function disablePlayerMovement()
    DisableControlAction(0, 21, true) -- INPUT_SPRINT | LEFT SHIFT
    DisableControlAction(0, 24, true) -- INPUT_ATTACK | LEFT MOUSE BUTTON
    DisableControlAction(0, 25, true) -- INPUT_AIM | RIGHT MOUSE BUTTON
    DisableControlAction(0, 30, true) -- INPUT_MOVE_LR | D
    DisableControlAction(0, 31, true) -- INPUT_MOVE_UD | S
    DisableControlAction(0, 36, true) -- INPUT_DUCK | LEFT CTRL
    DisableControlAction(0, 47, true) -- INPUT_DETONATE | G
    DisableControlAction(0, 58, true) -- INPUT_THROW_GRENADE | G
    DisableControlAction(0, 69, true) -- INPUT_VEH_ATTACK | LEFT MOUSE BUTTON
    DisableControlAction(0, 75, true) -- INPUT_VEH_EXIT | F
    DisableControlAction(0, 140, true) -- INPUT_MELEE_ATTACK_LIGHT | R
    DisableControlAction(0, 141, true) -- INPUT_MELEE_ATTACK_HEAVY | Q
    DisableControlAction(0, 142, true) -- INPUT_MELEE_ATTACK_ALTERNATE | LEFT MOUSE BUTTON
    DisableControlAction(0, 143, true) -- INPUT_MELEE_BLOCK | SPACEBAR
    DisableControlAction(0, 257, true) -- INPUT_ATTACK2 | LEFT MOUSE BUTTON
    DisableControlAction(0, 263, true) -- INPUT_MELEE_ATTACK1 | R
    DisableControlAction(0, 264, true) -- INPUT_MELEE_ATTACK2 | Q
end

local function disableCamMovement()
    DisableControlAction(0, 1, true) -- INPUT_LOOK_LR | MOUSE RIGHT
    DisableControlAction(0, 2, true) -- INPUT_LOOK_UD | MOUSE DOWN
    DisableControlAction(0, 3, true) -- INPUT_LOOK_UP_ONLY | (NONE)
    DisableControlAction(0, 4, true) -- INPUT_LOOK_DOWN_ONLY | MOUSE DOWN
    DisableControlAction(0, 5, true) -- INPUT_LOOK_LEFT_ONLY | (NONE)
    DisableControlAction(0, 6, true) -- INPUT_LOOK_RIGHT_ONLY | MOUSE RIGHT
    DisableControlAction(0, 12, true) -- INPUT_WEAPON_WHEEL_UD | MOUSE DOWN
    DisableControlAction(0, 13, true) -- INPUT_WEAPON_WHEEL_LR | MOUSE RIGHT
    DisableControlAction(0, 200, true) -- INPUT_FRONTEND_PAUSE_ALTERNATE | ESC
end

local function mouseDownListener()
    CreateThread(function()
        while running do
            setCamPosition()

            if IsDisabledControlJustReleased(0, 24) or IsControlJustReleased(0, 24) then
                SetMouseCursorSprite(3)
                return
            end

            Wait(0)
        end
    end)
end

local function inputListener()
    setCamPosition() -- Set initial cam position, otherwise cam will remain at player until first left click
    CreateThread(function()
        while running do
            DisableControlAction(0, 0, true) -- INPUT_NEXT_CAMERA | V
            disablePlayerMovement()
            if not isFirstPersonView then
                SetMouseCursorActiveThisFrame()
                disableCamMovement()

                if IsDisabledControlJustPressed(0, 24) or IsControlJustPressed(0, 24) then
                    SetMouseCursorSprite(4)
                    mouseDownListener()
                end
            end

            if IsDisabledControlJustReleased(0, 14) or IsControlJustReleased(0, 14) then
                if gRadius + scrollIncrements <= gRadiusMax then
                    gRadius += scrollIncrements
                    setCamPosition()
                end
            elseif IsDisabledControlJustReleased(0, 15) or IsControlJustReleased(0, 15) then
                if gRadius - scrollIncrements >= gRadiusMin then
                    gRadius -= scrollIncrements
                    setCamPosition()
                end
            end

            if IsControlJustPressed(0, 22) or IsControlJustPressed(0, 22) then
                local doors = GetNumberOfVehicleDoors(cache.vehicle)
                for i = 0, doors do
                    if GetVehicleDoorAngleRatio(cache.vehicle, i) > 0 then
                        SetVehicleDoorShut(cache.vehicle, i, false)
                    else
                        SetVehicleDoorOpen(cache.vehicle, i, false, false)
                    end
                end
            end

            if IsDisabledControlJustPressed(0, 0) or IsDisabledControlJustPressed(0, 0) then
                isFirstPersonView = not isFirstPersonView
                if isFirstPersonView then
                    SetCamViewModeForContext(1, 4)
                    RenderScriptCams(false, true, 0, true, false)
                else
                    RenderScriptCams(true, true, 0, true, false)
                end
            end

            Wait(0)
        end
    end)
end

local function instructionalButton(controlId, text)
    ScaleformMovieMethodAddParamPlayerNameString(GetControlInstructionalButton(0, controlId, true))
    BeginTextCommandScaleformString('STRING')
    AddTextComponentSubstringKeyboardDisplay(text)
    EndTextCommandScaleformString()
end

local function showInstructionalButtons()
    CreateThread(function()
        scaleform = RequestScaleformMovie('instructional_buttons')
        while not HasScaleformMovieLoaded(scaleform) do
            Wait(0)
        end
        BeginScaleformMovieMethod(scaleform, 'CLEAR_ALL')
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'SET_DATA_SLOT')
        ScaleformMovieMethodAddParamInt(1)
        instructionalButton(14, locale('dragCam.zoomOut'))
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'SET_DATA_SLOT')
        ScaleformMovieMethodAddParamInt(2)
        instructionalButton(15, locale('dragCam.zoomIn'))
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'SET_DATA_SLOT')
        ScaleformMovieMethodAddParamInt(3)
        instructionalButton(22, locale('dragCam.toggleDoors'))
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'SET_DATA_SLOT')
        ScaleformMovieMethodAddParamInt(4)
        instructionalButton(0, locale('dragCam.changeView'))
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'DRAW_INSTRUCTIONAL_BUTTONS')
        EndScaleformMovieMethod()

        BeginScaleformMovieMethod(scaleform, 'SET_BACKGROUND_COLOUR')
        ScaleformMovieMethodAddParamInt(0)
        ScaleformMovieMethodAddParamInt(0)
        ScaleformMovieMethodAddParamInt(0)
        ScaleformMovieMethodAddParamInt(80)
        EndScaleformMovieMethod()

        while running do
            DrawScaleformMovieFullscreen(scaleform, 255, 255, 255, 255, 0)
            Wait(0)
        end
    end)
end

---@param entity integer
---@param radiusOptions? {initial?: number, min?: number, max?: number, scrollIncrements?: number}
local function startDragCam(entity, radiusOptions)
    running = true
    gEntity = entity
    gRadius = radiusOptions?.initial or 5.0
    gRadiusMin = radiusOptions?.min or 2.5
    gRadiusMax = radiusOptions?.max or 10.0
    scrollIncrements = radiusOptions?.scrollIncrements or 0.5
    cam = CreateCam('DEFAULT_SCRIPTED_CAMERA', true)
    RenderScriptCams(true, true, 0, true, false)
    showInstructionalButtons()
    inputListener()
end

local function stopDragCam()
    running = false
    RenderScriptCams(false, true, 0, true, false)
    DestroyCam(cam, true)
    SetCamViewModeForContext(1, 1)
    SetScaleformMovieAsNoLongerNeeded(scaleform)
end

return {
    startDragCam = startDragCam,
    stopDragCam = stopDragCam
}