local wezterm = require "wezterm"

-- The filled in variant of the powerline ( symbol
local SOLID_LEFT_SEP = require("utf8").char(0xe0b6)

local M = {}
M.setup = function(scheme)
    wezterm.on("update-right-status", function(window, _)
        -- Each element holds the text for a cell in a "powerline" style << fade
        local cells = {}

        -- Show current active key table
        local name = window:active_key_table()
        if name then
            name = "TABLE: " .. name
            table.insert(cells, name)
        end

        -- I like my date/time in this style: "Wed Mar 3 08:14"
        -- local date = wezterm.strftime("%a %b %-d %H:%M")
        local date = wezterm.strftime "%Y-%m-%d"
        table.insert(cells, date)
        local time = wezterm.strftime "%H:%M"
        table.insert(cells, time)

        -- Get current hostname to track which device I'm on
        table.insert(cells, wezterm.hostname())

        -- An entry for each battery (typically 0 or 1 battery)
        for _, b in ipairs(wezterm.battery_info()) do
            table.insert(cells, string.format("%.0f%%", b.state_of_charge * 100))
        end

        -- Foreground color for the text across the fade
        local text_fg = scheme.tab_bar.active_tab.fg_color
        -- Tab bar background to complete fade
        local tab_bar_bg = scheme.tab_bar.background
        -- Color palette for the backgrounds of each cell
        local colours = wezterm.color.gradient({
            colors = {
                scheme.tab_bar.new_tab.bg_color,
                scheme.tab_bar.active_tab.bg_color,
            },
        }, #cells + 1)

        -- The elements to be formatted
        local elements = {}
        -- How many cells have been formatted
        local num_cells = 0

        -- Translate a cell into elements
        local function push(text, is_last)
            local cell_no = num_cells + 1
            table.insert(elements, { Foreground = { Color = text_fg } })
            table.insert(elements, { Background = { Color = colours[cell_no + 1] } })
            table.insert(elements, { Text = text })
            if not is_last then
                table.insert(elements, { Foreground = { Color = colours[cell_no + 2] } })
                table.insert(elements, { Text = " " .. SOLID_LEFT_SEP })
            end
            num_cells = num_cells + 1
        end

        table.insert(elements, { Foreground = { Color = colours[num_cells + 2] } })
        table.insert(elements, { Background = { Color = tab_bar_bg } })
        table.insert(elements, { Text = SOLID_LEFT_SEP })
        while #cells > 0 do
            local cell = table.remove(cells, 1)
            push(cell, #cells == 0)
        end

        window:set_right_status(wezterm.format(elements))
    end)
end
return M