local augroup = vim.api.nvim_create_augroup("LspFormatting", {})

local on_attach = function(client, bufnr)
    local function nnoremap(key, command)
        vim.keymap.set("n", key, command, { noremap = true, silent = true, buffer = bufnr })
    end

    local function format_buffer()
        vim.lsp.buf.format({
            timeout_ms = 3000,
            async = false,
            filter = function(formatter)
                return formatter.name ~= "tsserver" and formatter.name ~= "volar"
            end
        })
    end

    require("lsp-inlayhints").on_attach(client, bufnr)

    local telescope = require("telescope.builtin")

    nnoremap("gD", vim.lsp.buf.declaration)
    nnoremap("gd", telescope.lsp_definitions)
    nnoremap("gt", telescope.lsp_type_definitions)
    nnoremap("gi", telescope.lsp_implementations)
    nnoremap("gr", telescope.lsp_references)
    nnoremap("K", vim.lsp.buf.hover)
    nnoremap("<leader>rn", vim.lsp.buf.rename)
    nnoremap("<leader>ca", vim.lsp.buf.code_action)
    nnoremap("<leader>f", format_buffer)
    nnoremap("<leader>d", telescope.diagnostics)
    nnoremap("<leader>D", require("lsp_lines").toggle)
    nnoremap("<C-p>", vim.diagnostic.goto_prev)
    nnoremap("<C-n>", vim.diagnostic.goto_next)

    if client.supports_method("textDocument/formatting") then
        vim.api.nvim_clear_autocmds({ group = augroup, buffer = bufnr })
        vim.api.nvim_create_autocmd("BufWritePre", {
            group = augroup,
            buffer = bufnr,
            callback = format_buffer,
        })
    end
end

require("lsp-inlayhints").setup({})

local lsp_status = require("lsp-status")
lsp_status.config({
    current_function = false,
    show_filename = false,
    diagnostics = true,
    status_symbol = "",
})
lsp_status.register_progress()

-- setup lua language server for init.nvim and nvim plugin development
require("neodev").setup({
    override = function(root_dir, options)
        if require("neodev.util").has_file(root_dir, "/etc/nixos") then
            options.enabled = true
            options.plugins = true
        end
    end,
})

local capabilities = require("cmp_nvim_lsp").default_capabilities(lsp_status.capabilities)

local servers = {
    ["bashls"] = {},
    ["clangd"] = {},
    ["cmake"] = {},
    ["dockerls"] = {},
    ["eslint"] = {},
    ["html"] = {},
    ["jsonls"] = {},
    ["lua_ls"] = {
        Lua = {
            runtime = {
                version = "LuaJIT",
            },
            diagnostics = {
                globals = { "vim" },
            },
            workspace = {
                library = vim.api.nvim_get_runtime_file("", true),
            },
            telemetry = {
                enable = false,
            },
        },
    },
    ["marksman"] = {},
    ["pylsp"] = {
        pylsp = {
            plugins = {
                pycodestyle = {
                    maxLineLength = 120
                }
            }
        }
    },
    ["pyright"] = {},
    ["rnix"] = {},
    ["terraformls"] = {},
    ["texlab"] = {},
    ["tflint"] = {},
    ["tsserver"] = {},
    ["yamlls"] = {
        yaml = {
            keyOrdering = false
        }
    },
}

local lspconfig = require("lspconfig")

for lsp, settings in pairs(servers) do
    lspconfig[lsp].setup({
        settings = settings,
        on_attach = on_attach,
        capabilities = capabilities,
    })
end

-- setup rustaceanvim
vim.g.rustaceanvim = {
    server = {
        on_attach = on_attach,
        settings = {
            ["rust-analyzer"] = {
                cargo = {
                    loadOutDirsFromCheck = true,
                },
                checkOnSave = { command = "clippy" },
                procMacro = {
                    enable = true,
                },
            },
        },
    },
}

-- setup null-ls for markdown formatting
local null_ls = require("null-ls")
null_ls.setup({
    sources = {
        null_ls.builtins.formatting.prettier,
        null_ls.builtins.diagnostics.tsc,
    },
    on_attach = on_attach,
})

-- setup lsp_lines
require("lsp_lines").setup()

-- setup vim diagnostics
vim.diagnostic.config({
    virtual_text = false,
    signs = true,
    update_in_insert = true,
    underline = true,
    severity_sort = true,
    float = {
        border = "rounded",
        source = "always",
        header = "",
        prefix = "",
    },
})

-- setup diagnostics signs
local diagnostics_signs = { Error = "", Warn = "", Hint = "", Info = "" }
for type, icon in pairs(diagnostics_signs) do
    local hl = "DiagnosticSign" .. type
    vim.fn.sign_define(hl, { text = icon, texthl = hl, numhl = hl })
end

-- setup volar
lspconfig["volar"].setup({
    filetypes = { 'typescript', 'javascript', 'javascriptreact', 'typescriptreact', 'vue', 'json' },
    on_attach = on_attach,
    capabilities = capabilities,
})