-- language server setup
local lspconfig = require('lspconfig')

-- Go
lspconfig.gopls.setup{
    cmd = {"gopls", "serve"},
    filetypes = {"go", "gomod"},
    settings = {
        gopls = {
            analyses = {
                unusedparams = true,
            },
            staticcheck = true,
        },
    },
}

-- C/C++
lspconfig.clangd.setup{}

-- Arduino (C)
lspconfig.arduino_language_server.setup{}

-- Lua
lspconfig.lua_ls.setup{
    settings = {
        Lua = {
            diagnostics = {globals = {'vim', 'opts'}},
        },
        telemetry = {
            enable = false,
        },
    },
}

-- Rust
lspconfig.rust_analyzer.setup{}

-- Python
lspconfig.pylsp.setup{}

-- TypeScript
lspconfig.tsserver.setup{}

-- Fix virtual text going off screen
vim.diagnostic.config({
    virtual_text = false,
    signs = true,
    underline = true,
    update_in_insert = false,
    severity_sort = false,
})


vim.api.nvim_create_autocmd('LspAttach', {
    callback = function(ev)
        -- custom colors
        vim.cmd('hi DiagnosticUnderlineError cterm=undercurl')
        vim.cmd('hi DiagnosticUnderlineWarn cterm=undercurl')
        vim.cmd('hi DiagnosticUnderlineInfo cterm=undercurl')
        vim.cmd('hi DiagnosticUnderlineHint cterm=undercurl')
        vim.cmd('hi DiagnosticUnderlineOk cterm=undercurl')
        -- key mappings
        local opts = { buffer = ev.buf,}
        -- error viewing
        vim.keymap.set('n', '<leader>e', vim.diagnostic.open_float, opts)
        vim.keymap.set('n', '<leader>[d', vim.diagnostic.goto_prev, opts)
        vim.keymap.set('n', '<leader>]d', vim.diagnostic.goto_next, opts)
        -- def viewing/rename
        vim.keymap.set('n', '<leader>gD', vim.lsp.buf.declaration, opts)
        vim.keymap.set('n', '<leader>gd', vim.lsp.buf.definition, opts)
        vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
        vim.keymap.set('n', '<leader>H', vim.lsp.buf.hover, opts)
        -- auto hover for error viewing
        vim.api.nvim_create_autocmd("CursorHold", {
            callback = function()
                opts = {
                    buffer = ev.buf,
                    focusable = false,
                    border = 'rounded',
                    source = 'always',
                    prefix = ' ',
                    scope = 'cursor',
                    close_events = { "BufLeave","CursorMoved","InsertEnter","FocusLost" },
                }
                vim.diagnostic.open_float(nil, opts)
            end
        })
    end,
})