--[[
stylish-roles - provide existence hints for attributes and CrediT roles
as authors[*].metadata.credit[role], by-author[*].metadata.credit[role],
some-author-has[*].credit[role] and some-author-has.attributes[attribute].

Copyright: © 2024 Jonas Smedegaard <dr@jones.dk
License:   MIT – see LICENSE file for details
]]
function Meta(meta)
    local attributes = {"corresponding", "equal-contributor"}

    for _, author in ipairs(meta.authors) do
        if author.roles then
            local _by = meta["by-author"][tonumber(author.number)]
            local _some = meta["some-author-has"]

            for _, role in ipairs(author.roles) do
                if role["vocab-term"] then

                    -- create if missing
                    author.metadata.credit = author.metadata.credit or {}
                    _by.metadata.credit = _by.metadata.credit or {}
                    meta["some-author-has"] = meta["some-author-has"] or {}
                    meta["some-author-has"].credit = meta["some-author-has"].credit or {}

                    author.metadata.credit[role["vocab-term"]] = true
                    _by.metadata.credit[role["vocab-term"]] = true
                    meta["some-author-has"].credit[role["vocab-term"]] = true

                    -- debugging aid
                    --error(pandoc.utils.stringify(author.name.literal)
                    --    .. " does " .. role["vocab-term"] .. ".")
                end
            end

            for _, attr in ipairs(attributes) do
                if author.attributes and author.attributes[attr] then
                    -- create if missing
                    meta["some-author-has"].attributes = meta["some-author-has"].attributes or {}

                    meta["some-author-has"].attributes[attr] = true
                end
            end
        end
    end

    -- debugging aid
    --quarto.utils.dump(meta)
    --quarto.utils.dump(meta["authors"])
    --quarto.utils.dump(meta["by-author"])
    --quarto.utils.dump(meta["some-author-has"])

    return meta
end