-- Author        : swytch
-- Created       : Friday Oct. 22, 2021 22:04:40 CET
-- License       : GPLv3
-- Description   : core-level functions file


local config    = require("astronomy.config")
local theme     = require("astronomy.scheme")
local colors    = require("astronomy.colors")

local api = vim.api
local M = {}

-- Apply colors in the editor
--@param group string: group name
--@param cols string: color name to be applied to the groups
local function set_highlights(group, cols)
        api.nvim_command(string.format('highlight %s gui=%s guifg=%s guibg=%s guisp=%s',
                group,
                cols.style or "NONE",
                cols.fg    or "NONE",
                cols.bg    or "NONE",
                cols.sp    or "NONE"
        ))

        if cols.link then
                api.nvim_command(string.format("highlight! link %s %s", group, cols.link))
        end
end

-- Load colorscheme
--@param scheme table: editor elements with its colors
--@param custom_tab table: custom color table
local function load_colorscheme(scheme, custom_tab)
        local color_table = scheme or {}
        local custom_colors = custom_tab or {}

        -- reset the highlighting
        if vim.fn.exists("sintax_on") then api.nvim_command("syntax reset") end
        vim.opt.background = "dark"
        vim.g.colors_name = "astronomy"
        vim.g.astronomy = 1
        vim.opt.termguicolors = true

        if type(custom_colors) == "table" then
                if next(custom_colors) ~= nil then
                        color_table = vim.tbl_deep_extend("force", {}, color_table, custom_colors)
                end
        end

        --Load editor colors
        for grp, col in pairs(color_table) do
                set_highlights(grp, col)
        end

end

-- Set and load the color scheme
--@param opts table: custom options to be applied to the editor
function M.setup_scheme(opts)
        config.set_options(opts)
        local sch_opts = config.scheme_options

        local scheme = colors.set_scheme(sch_opts.variant)
        local colorscheme = theme.load_colors(scheme)

        load_colorscheme(colorscheme, sch_opts.custom_colors)
end

return M