local path = require "nvim-lsp-installer.path"
local Data = require "nvim-lsp-installer.data"
local installers = require "nvim-lsp-installer.installers"
local std = require "nvim-lsp-installer.installers.std"
local platform = require "nvim-lsp-installer.platform"
local process = require "nvim-lsp-installer.process"

local M = {}

local REL_INSTALL_DIR = "venv"

function M.packages(packages)
    return installers.pipe {
        std.ensure_executables {
            { "python3", "python3 was not found in path. Refer to https://www.python.org/downloads/." },
            { "pip3", "pip3 was not found in path." },
        },
        function(server, callback, context)
            local pkgs = Data.list_copy(packages or {})
            local c = process.chain {
                cwd = server.root_dir,
                stdio_sink = context.stdio_sink,
            }

            c.run("python3", { "-m", "venv", REL_INSTALL_DIR })
            if context.requested_server_version then
                -- The "head" package is the recipient for the requested version. It's.. by design... don't ask.
                pkgs[1] = ("%s==%s"):format(pkgs[1], context.requested_server_version)
            end
            c.run(M.executable(server.root_dir, "pip3"), vim.list_extend({ "install", "-U" }, pkgs))

            c.spawn(callback)
        end,
    }
end

function M.executable(root_dir, executable)
    return path.concat { root_dir, REL_INSTALL_DIR, platform.is_win and "Scripts" or "bin", executable }
end

return M