-- cgltf.lua (Part 1)
local ffi = require("ffi")
local cgltf = {}
local C = ffi.C

--[[
Public API Functions (from cgltf.h)
Part 1: top-level parsing & freeing
]]

-- cgltf_result cgltf_parse(const cgltf_options* options, const void* data, size_t size, cgltf_data** out_data)
function cgltf.cgltf_parse(options, data, size, out_data)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_file(const cgltf_options* options, const char* path, cgltf_data** out_data)
function cgltf.cgltf_parse_file(options, path, out_data)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_load_buffers(const cgltf_options* options, cgltf_data* data, const char* path)
function cgltf.cgltf_load_buffers(options, data, path)
    -- TODO: implement
    error("not implemented yet")
end

-- void cgltf_free(cgltf_data* data)
function cgltf.cgltf_free(data)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_validate(const cgltf_data* data)
function cgltf.cgltf_validate(data)
    -- TODO: implement
    error("not implemented yet")
end

-- Helper function: allocate out-param pointer if needed
-- Usage pattern:
-- local out_ptr = ffi.new("cgltf_data*[1]")
-- cgltf.cgltf_parse(options, data, size, out_ptr)
-- local result_data = out_ptr[0]

-- cgltf.lua (Part 2)
--[[
Internal JSON Parsing Helpers
Part 2: JSON parse functions from cgltf.h implementation
]]

-- cgltf_result cgltf_parse_json(const cgltf_options* options, const char* json_data, size_t size, cgltf_data* data)
function cgltf.cgltf_parse_json(options, json_data, size, data)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_asset(cgltf_data* data, const void* json_asset)
function cgltf.cgltf_parse_json_asset(data, json_asset)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_buffers(cgltf_data* data, const void* json_buffers)
function cgltf.cgltf_parse_json_buffers(data, json_buffers)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_buffer_views(cgltf_data* data, const void* json_buffer_views)
function cgltf.cgltf_parse_json_buffer_views(data, json_buffer_views)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_accessors(cgltf_data* data, const void* json_accessors)
function cgltf.cgltf_parse_json_accessors(data, json_accessors)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_nodes(cgltf_data* data, const void* json_nodes)
function cgltf.cgltf_parse_json_nodes(data, json_nodes)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_meshes(cgltf_data* data, const void* json_meshes)
function cgltf.cgltf_parse_json_meshes(data, json_meshes)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_materials(cgltf_data* data, const void* json_materials)
function cgltf.cgltf_parse_json_materials(data, json_materials)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_textures(cgltf_data* data, const void* json_textures)
function cgltf.cgltf_parse_json_textures(data, json_textures)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_images(cgltf_data* data, const void* json_images)
function cgltf.cgltf_parse_json_images(data, json_images)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_samplers(cgltf_data* data, const void* json_samplers)
function cgltf.cgltf_parse_json_samplers(data, json_samplers)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_skins(cgltf_data* data, const void* json_skins)
function cgltf.cgltf_parse_json_skins(data, json_skins)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_cameras(cgltf_data* data, const void* json_cameras)
function cgltf.cgltf_parse_json_cameras(data, json_cameras)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_nodes_extra(cgltf_data* data, const void* json_nodes)
function cgltf.cgltf_parse_json_nodes_extra(data, json_nodes)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf.lua (Part 3)
--[[
Internal Buffer, Accessor, and Image Helpers
Part 3: data-loading functions from cgltf.h implementation
]]

-- cgltf_result cgltf_parse_json_mesh_primitives(cgltf_data* data, const void* json_primitives)
function cgltf.cgltf_parse_json_mesh_primitives(data, json_primitives)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_accessor_data(cgltf_data* data, const void* json_accessors)
function cgltf.cgltf_parse_json_accessor_data(data, json_accessors)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_buffer_view_data(cgltf_data* data, const void* json_buffer_views)
function cgltf.cgltf_parse_json_buffer_view_data(data, json_buffer_views)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_buffer_data(cgltf_data* data, const void* json_buffers)
function cgltf.cgltf_parse_json_buffer_data(data, json_buffers)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_image_data(cgltf_data* data, const void* json_images)
function cgltf.cgltf_parse_json_image_data(data, json_images)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_sampler_data(cgltf_data* data, const void* json_samplers)
function cgltf.cgltf_parse_json_sampler_data(data, json_samplers)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_material_data(cgltf_data* data, const void* json_materials)
function cgltf.cgltf_parse_json_material_data(data, json_materials)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_skin_data(cgltf_data* data, const void* json_skins)
function cgltf.cgltf_parse_json_skin_data(data, json_skins)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_parse_json_camera_data(cgltf_data* data, const void* json_cameras)
function cgltf.cgltf_parse_json_camera_data(data, json_cameras)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_load_buffer(cgltf_data* data, cgltf_buffer* buffer, const char* path)
function cgltf.cgltf_load_buffer(data, buffer, path)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_load_image(cgltf_data* data, cgltf_image* image, const char* path)
function cgltf.cgltf_load_image(data, image, path)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf_result cgltf_load_buffers(cgltf_data* data, const char* path)
function cgltf.cgltf_load_buffers(data, path)
    -- TODO: implement
    error("not implemented yet")
end

-- cgltf.lua (Part 4)
--[[
Internal Utilities, Helpers, and Final Parsing Methods
Part 4: remaining functions from cgltf.h implementation
]]

function cgltf.cgltf_default_alloc(user, cgltf_size size)
	return ffi.new("uint8_t[?]", size)
end

function cgltf.cgltf_default_free(user, ptr)
    ffi.free(ptr)
end

-- void* cgltf_allocate(const cgltf_options* options, size_t size)
function cgltf.cgltf_allocate(options, size)
    -- TODO: implement memory allocation logic
    error("not implemented yet")
end

-- void cgltf_free_memory(const cgltf_options* options, void* ptr)
function cgltf.cgltf_free_memory(options, ptr)
    -- TODO: implement memory free logic
    error("not implemented yet")
end

-- const char* cgltf_lookup_string(const void* json_object, const char* key)
function cgltf.cgltf_lookup_string(json_object, key)
    -- TODO: implement string lookup from JSON
    error("not implemented yet")
end

-- cgltf_bool cgltf_json_type_is_valid(int json_type, int expected_type)
function cgltf.cgltf_json_type_is_valid(json_type, expected_type)
    -- TODO: implement JSON type validation
    error("not implemented yet")
end

-- cgltf_result cgltf_copy_string(const char* src, char** dst)
function cgltf.cgltf_copy_string(src, dst)
    -- TODO: implement string copy
    error("not implemented yet")
end

-- void cgltf_default_values(cgltf_data* data)
function cgltf.cgltf_default_values(data)
    -- TODO: implement default value population
    error("not implemented yet")
end

-- void cgltf_cleanup_extras(cgltf_data* data)
function cgltf.cgltf_cleanup_extras(data)
    -- TODO: implement extras cleanup
    error("not implemented yet")
end

-- void cgltf_cleanup(cgltf_data* data)
function cgltf.cgltf_cleanup(data)
    -- TODO: implement full cleanup of cgltf_data
    error("not implemented yet")
end

-- void cgltf_free(cgltf_data* data)  -- final alias to cleanup
function cgltf.cgltf_free(data)
    -- TODO: implement free alias
    error("not implemented yet")
end

-- Final module return
return cgltf