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-- This is taken directly from https://github.com/neovim/nvim-lspconfig/pull/863.

local configs = require "lspconfig/configs"
local util = require "lspconfig/util"

if configs.ltex then
    return
end

local function readFiles(files)
    local dict = {}
    for _, file in pairs(files) do
        local f = io.open(file, "r")
        for l in f:lines() do
            table.insert(dict, l)
        end
    end
    return dict
end

local function findLtexLang()
    local buf_clients = vim.lsp.buf_get_clients()
    for _, client in pairs(buf_clients) do
        if client.name == "ltex" then
            return client.config.settings.ltex.language
        end
    end
end

local function findLtexFiles(filetype, value)
    local buf_clients = vim.lsp.buf_get_clients()
    for _, client in pairs(buf_clients) do
        if client.name == "ltex" then
            local files = nil
            if filetype == "dictionary" then
                files = client.config.dictionary_files[value or findLtexLang()]
            elseif filetype == "disable" then
                files = client.config.disabledrules_files[value or findLtexLang()]
            elseif filetype == "falsePositive" then
                files = client.config.falsepositive_files[value or findLtexLang()]
            end

            if files then
                return files
            else
                return nil
            end
        end
    end
end

local function updateConfig(lang, configtype)
    local buf_clients = vim.lsp.buf_get_clients()
    local client = nil
    for _, lsp in pairs(buf_clients) do
        if lsp.name == "ltex" then
            client = lsp
        end
    end

    if client then
        if configtype == "dictionary" then
            -- if client.config.settings.ltex.dictionary then
            client.config.settings.ltex.dictionary = {
                [lang] = readFiles(client.config.dictionary_files[lang]),
            }
            return client.notify("workspace/didChangeConfiguration", client.config.settings)
            -- else
            -- return vim.notify("Error when reading dictionary config, check it")
            -- end
        elseif configtype == "disable" then
            if client.config.settings.ltex.disabledRules then
                client.config.settings.ltex.disabledRules = {
                    [lang] = readFiles(client.config.disabledrules_files[lang]),
                }
                return client.notify("workspace/didChangeConfiguration", client.config.settings)
            else
                return vim.notify "Error when reading disabledRules config, check it"
            end
        elseif configtype == "falsePositive" then
            if client.config.settings.ltex.hiddenFalsePositives then
                client.config.settings.ltex.hiddenFalsePositives = {
                    [lang] = readFiles(client.config.falsepositive_files[lang]),
                }
                return client.notify("workspace/didChangeConfiguration", client.config.settings)
            else
                return vim.notify "Error when reading hiddenFalsePositives config, check it"
            end
        end
    else
        return nil
    end
end

local function addToFile(filetype, lang, file, value)
    file = io.open(file[#file - 0], "a+") -- add only to last file defined.
    if file then
        file:write(value .. "\n")
        file:close()
    else
        return print("Failed insert %q", value)
    end
    if filetype == "dictionary" then
        return updateConfig(lang, "dictionary")
    elseif filetype == "disable" then
        return updateConfig(lang, "disable")
    elseif filetype == "falsePositive" then
        return updateConfig(lang, "falsePositive")
    end
end

local function addTo(filetype, lang, file, value)
    local dict = readFiles(file)
    for _, v in ipairs(dict) do
        if v == value then
            return nil
        end
    end
    return addToFile(filetype, lang, file, value)
end

configs.ltex = {
    default_config = {
        cmd = { "ltex-ls" },
        filetypes = { "tex", "bib", "markdown" },
        root_dir = function(filename)
            return util.path.dirname(filename)
        end,
        dictionary_files = { ["en"] = { vim.fn.getcwd() .. "dictionary.ltex" } },
        disabledrules_files = { ["en"] = { vim.fn.getcwd() .. "disable.ltex" } },
        falsepositive_files = { ["en"] = { vim.fn.getcwd() .. "false.ltex" } },
        settings = {
            ltex = {
                enabled = { "latex", "tex", "bib", "markdown" },
                checkFrequency = "save",
                language = "en",
                diagnosticSeverity = "information",
                setenceCacheSize = 2000,
                additionalRules = {
                    enablePickyRules = true,
                    motherTongue = "en",
                },
                dictionary = {},
                disabledRules = {},
                hiddenFalsePositives = {},
            },
        },
        on_attach = function(client, bufnr)
            -- local lang = client.config.settings.ltex.language
            for lang, _ in ipairs(client.config.dictionary_files) do --
                updateConfig(lang, "dictionary")
                updateConfig(lang, "disable")
                updateConfig(lang, "falsePositive")
            end
        end,
    },
}
--
-- https://github.com/neovim/nvim-lspconfig/issues/858 can't intercept,
-- override it then.
local orig_execute_command = vim.lsp.buf.execute_command
vim.lsp.buf.execute_command = function(command)
    if command.command == "_ltex.addToDictionary" then
        local arg = command.arguments[1].words -- can I really access like this?
        for lang, words in pairs(arg) do
            for _, word in ipairs(words) do
                local filetype = "dictionary"
                addTo(filetype, lang, findLtexFiles(filetype, lang), word)
            end
        end
    elseif command.command == "_ltex.disableRules" then
        local arg = command.arguments[1].ruleIds -- can I really access like this?
        for lang, rules in pairs(arg) do
            for _, rule in ipairs(rules) do
                local filetype = "disable"
                addTo(filetype, lang, findLtexFiles(filetype, lang), rule)
            end
        end
    elseif command.command == "_ltex.hideFalsePositives" then
        local arg = command.arguments[1].falsePositives -- can I really access like this?
        for lang, rules in pairs(arg) do
            for _, rule in ipairs(rules) do
                local filetype = "falsePositive"
                addTo(filetype, lang, findLtexFiles(filetype, lang), rule)
            end
        end
    else
        orig_execute_command(command)
    end
end