--[[
AiSpire 3D Model Helper Functions

This module provides helper functions for importing, transforming, and manipulating
3D models in Vectric Aspire/V-Carve.
]]

local ModelHelpers = {}

-- Import a 3D model from file
-- @param filepath The path to the 3D model file
-- @param options Table with import options like scale, position, etc.
-- @return The imported model object or nil and error message if failed
function ModelHelpers.importModel(filepath, options)
    options = options or {}
    
    -- Set default options if not provided
    local scale = options.scale or 1.0
    local x_pos = options.x_pos or 0
    local y_pos = options.y_pos or 0
    local z_pos = options.z_pos or 0
    local rotation = options.rotation or 0
    
    -- Validate file exists
    local f = io.open(filepath, "r")
    if not f then
        return nil, "File not found: " .. filepath
    end
    f:close()
    
    -- Create a try-catch block to handle potential errors
    local success, result = pcall(function()
        -- This would use actual Vectric SDK functions
        -- Based on available stubs, we'd need to use appropriate function
        -- Example: local model = VectricJob.Import3DModel(filepath)
        
        -- For now, we'll simulate this with placeholder code
        local model = {} -- This would be the actual model object
        model.filepath = filepath
        model.position = {x = x_pos, y = y_pos, z = z_pos}
        model.scale = scale
        model.rotation = rotation
        
        -- Apply transformations
        if scale ~= 1.0 then
            -- Model:Scale(scale)
        end
        
        if x_pos ~= 0 or y_pos ~= 0 or z_pos ~= 0 then
            -- Model:Move(x_pos, y_pos, z_pos)
        end
        
        if rotation ~= 0 then
            -- Model:Rotate(rotation)
        end
        
        return model
    end)
    
    if success then
        return result
    else
        return nil, "Failed to import model: " .. tostring(result)
    end
end

-- Transform a 3D model
-- @param model The model object to transform
-- @param transformation Table with transformation parameters
-- @return Success status and error message if failed
function ModelHelpers.transformModel(model, transformation)
    if not model then
        return false, "Invalid model object"
    end
    
    transformation = transformation or {}
    
    -- Apply transformations if specified
    if transformation.scale then
        -- Model:Scale(transformation.scale)
        model.scale = transformation.scale
    end
    
    if transformation.position then
        -- Model:Move(transformation.position.x, transformation.position.y, transformation.position.z)
        model.position = transformation.position
    end
    
    if transformation.rotation then
        -- Model:Rotate(transformation.rotation)
        model.rotation = transformation.rotation
    end
    
    return true
end

-- Position a 3D model on the material
-- @param model The model object to position
-- @param alignment String indicating alignment (center, top_left, etc.)
-- @param z_strategy String indicating Z positioning (on_surface, at_height, etc.)
-- @param z_value Number for specific Z height if needed
-- @return Success status and error message if failed
function ModelHelpers.positionModel(model, alignment, z_strategy, z_value)
    if not model then
        return false, "Invalid model object"
    end
    
    alignment = alignment or "center"
    z_strategy = z_strategy or "on_surface"
    z_value = z_value or 0
    
    -- Get material block dimensions
    local material_width = 0 -- This would come from Job:GetMaterialBlock():GetWidth()
    local material_height = 0 -- This would come from Job:GetMaterialBlock():GetHeight()
    local material_thickness = 0 -- This would come from Job:GetMaterialBlock():GetThickness()
    
    local x_pos, y_pos, z_pos = 0, 0, 0
    
    -- Calculate position based on alignment
    if alignment == "center" then
        x_pos = material_width / 2
        y_pos = material_height / 2
    elseif alignment == "top_left" then
        x_pos = 0
        y_pos = material_height
    elseif alignment == "top_right" then
        x_pos = material_width
        y_pos = material_height
    elseif alignment == "bottom_left" then
        x_pos = 0
        y_pos = 0
    elseif alignment == "bottom_right" then
        x_pos = material_width
        y_pos = 0
    end
    
    -- Calculate Z position
    if z_strategy == "on_surface" then
        z_pos = material_thickness
    elseif z_strategy == "at_height" then
        z_pos = z_value
    elseif z_strategy == "center" then
        z_pos = material_thickness / 2
    elseif z_strategy == "bottom" then
        z_pos = 0
    end
    
    -- Apply the position
    -- Model:MoveTo(x_pos, y_pos, z_pos)
    model.position = {x = x_pos, y = y_pos, z = z_pos}
    
    return true
end

-- Combine multiple 3D models into a single composite model
-- @param models Array of model objects to combine
-- @param operation String indicating boolean operation (add, subtract, intersect)
-- @return The resulting composite model or nil and error message if failed
function ModelHelpers.combineModels(models, operation)
    if not models or #models == 0 then
        return nil, "No models provided for combination"
    end
    
    operation = operation or "add"
    
    -- This would use actual SDK functions for boolean operations
    -- For now, simulate with placeholder
    local composite = {
        type = "composite_model",
        operation = operation,
        components = models
    }
    
    return composite
end

-- Create a basic 3D shape programmatically
-- @param shape_type String indicating the type of shape (cube, cylinder, sphere, etc.)
-- @param parameters Table with shape-specific parameters
-- @return The created shape model or nil and error message if failed
function ModelHelpers.createBasicShape(shape_type, parameters)
    parameters = parameters or {}
    
    -- Validate required parameters
    if shape_type == "cube" and not (parameters.width and parameters.height and parameters.depth) then
        return nil, "Cube requires width, height, and depth parameters"
    elseif shape_type == "cylinder" and not (parameters.radius and parameters.height) then
        return nil, "Cylinder requires radius and height parameters"
    elseif shape_type == "sphere" and not parameters.radius then
        return nil, "Sphere requires radius parameter"
    end
    
    -- This would use actual SDK functions to create shapes
    -- For now, simulate with placeholder
    local model = {
        type = shape_type,
        parameters = parameters
    }
    
    return model
end

-- Export a 3D model to file
-- @param model The model object to export
-- @param filepath The destination file path
-- @param format The export format (stl, obj, etc.)
-- @return Success status and error message if failed
function ModelHelpers.exportModel(model, filepath, format)
    if not model then
        return false, "Invalid model object"
    end
    
    format = format or "stl"
    
    -- Validate filepath
    local dir = filepath:match("(.*)[/\\]")
    local file = io.open(dir .. "/test_write_access", "w")
    if not file then
        return false, "Cannot write to directory: " .. dir
    end
    file:close()
    os.remove(dir .. "/test_write_access")
    
    -- This would use actual SDK export functions
    -- For now, simulate success
    return true
end

return ModelHelpers
