# The goal of this file is to import PlutoRunner into Main. 
# 
# This is difficult because PlutoRunner uses standard libraries and packages that are not necessarily available in the standard environment. 
# 
# Our solution is to create a temporary environment just for loading PlutoRunner. This environment is stored in a scratchspace parameterized by the Pluto version and julia version,
# and used by all notebook launches. Reusing the environment means extra speed.


begin
    pushfirst!(LOAD_PATH, "@stdlib")
    import Pkg
    popfirst!(LOAD_PATH)

    local original_LP = copy(LOAD_PATH)
    local original_AP = Base.ACTIVE_PROJECT[]

    # Path to our notebook boot package environment which is set by WorkspaceManager
    # when spawning the process.
    local runner_env_dir = pluto_boot_environment_path

    local new_LP = ["@", "@stdlib"]
    local new_AP = runner_env_dir

    try
        # Activate the environment
        copy!(LOAD_PATH, new_LP)
        Base.ACTIVE_PROJECT[] = new_AP

        # Set up our notebook boot package environment by adding a single package:
        path = joinpath(@__DIR__, "PlutoRunner")
        try
            Pkg.develop([Pkg.PackageSpec(; path)]; io=devnull)
        catch
            @warn "Something went wrong while initializing the notebook boot environment... Trying again and showing you the output."
            Pkg.develop([Pkg.PackageSpec(; path)])
        end

        # Resolve
        try
            Pkg.resolve(; io=devnull) # supress IO
        catch
            @warn "Something went wrong while initializing the notebook boot environment... Trying again and showing you the output."
            try
                Pkg.resolve()
            catch e
                @error "Failed to resolve notebook boot environment" exception = (e, catch_backtrace())
            end
        end

        # Instantiate
        try
            # we don't suppress IO for this one because it can take very long, and that would be a frustrating experience without IO
            # precompilation switched off because of https://github.com/fonsp/Pluto.jl/issues/875
            Pkg.instantiate(; update_registry=false, allow_autoprecomp=false)
        catch e
            @error "Failed to instantiate notebook boot environment" exception = (e, catch_backtrace())
        end

        # Import PlutoRunner into Main
        import PlutoRunner

    finally
        # Reset the pkg environment
        copy!(LOAD_PATH, original_LP)
        Base.ACTIVE_PROJECT[] = original_AP
    end
end