-- ~/.config/nvim/lua/plugins/lsp.lua
return {
  -- Mason (LSP installer)
  {
    "williamboman/mason.nvim",
    build = ":MasonUpdate",
    opts = {},
  },
  
  -- Mason LSP config integration
  {
    "williamboman/mason-lspconfig.nvim",
    dependencies = { "mason.nvim" },
    opts = {
      ensure_installed = { "lua_ls", "pyright", "texlab", "bashls", "marksman" },
    },
  },
  
  -- LSP configuration
  {
    "neovim/nvim-lspconfig",
    dependencies = { 
      "mason.nvim",
      "mason-lspconfig.nvim",
      "hrsh7th/cmp-nvim-lsp",
    },
    config = function()
      local lspconfig = require("lspconfig")
      local capabilities = require("cmp_nvim_lsp").default_capabilities()
      
      -- Configure diagnostics to be hidden by default
      vim.diagnostic.config({
        virtual_text = false,
        signs = false,
        underline = false,
        update_in_insert = false,
        severity_sort = false,
      })
      
      -- Set up keymaps for LSP
      vim.api.nvim_create_autocmd("LspAttach", {
        group = vim.api.nvim_create_augroup("UserLspConfig", {}),
        callback = function(ev)
          local opts = { buffer = ev.buf }
          vim.keymap.set('n', 'gd', vim.lsp.buf.definition, opts)
          vim.keymap.set('n', 'gr', vim.lsp.buf.references, opts)
          vim.keymap.set('n', 'K', vim.lsp.buf.hover, opts)
          vim.keymap.set('n', '<leader>rn', vim.lsp.buf.rename, opts)
          vim.keymap.set('n', '<leader>ca', vim.lsp.buf.code_action, opts)
          vim.keymap.set('n', '[d', vim.diagnostic.goto_prev, opts)
          vim.keymap.set('n', ']d', vim.diagnostic.goto_next, opts)
        end,
      })
      
      -- Language servers setup with capabilities
      lspconfig.lua_ls.setup({
        capabilities = capabilities,
      })
      lspconfig.pyright.setup({
        capabilities = capabilities,
      })
      lspconfig.texlab.setup({
        capabilities = capabilities,
      })
      lspconfig.bashls.setup({
        capabilities = capabilities,
      })
      lspconfig.marksman.setup({
        capabilities = capabilities,
      })
    end,
  },
  
  -- Completion
  {
    "hrsh7th/nvim-cmp",
    dependencies = {
      "hrsh7th/cmp-buffer",
      "hrsh7th/cmp-path", 
      "hrsh7th/cmp-nvim-lsp",
      "hrsh7th/cmp-nvim-lua",
      "saadparwaiz1/cmp_luasnip",
      {
        "L3MON4D3/LuaSnip",
        dependencies = { "rafamadriz/friendly-snippets", "evesdropper/luasnip-latex-snippets.nvim" },
        build = "make install_jsregexp",
      },
    },
    config = function()
      local cmp = require("cmp")
      local luasnip = require("luasnip")
      
      -- Load snippets
      require("luasnip.loaders.from_vscode").lazy_load()
      require("luasnip.loaders.from_lua").load({ paths = "~/.config/nvim/lua/snippets" })
      
      cmp.setup({
        snippet = {
          expand = function(args)
            luasnip.lsp_expand(args.body)
          end,
        },
        mapping = cmp.mapping.preset.insert({
          ["<C-Space>"] = cmp.mapping.complete(),
          ["<CR>"] = cmp.mapping.confirm({ select = true }),
          ["<Tab>"] = cmp.mapping(function(fallback)
            if require("copilot.suggestion").is_visible() then
              require("copilot.suggestion").accept()
            elseif cmp.visible() then
              cmp.select_next_item()
            elseif luasnip.expand_or_jumpable() then
              luasnip.expand_or_jump()
            else
              fallback()
            end
          end, { "i", "s" }),
          ["<S-Tab>"] = cmp.mapping(function(fallback)
            if cmp.visible() then
              cmp.select_prev_item()
            elseif luasnip.jumpable(-1) then
              luasnip.jump(-1)
            else
              fallback()
            end
          end, { "i", "s" }),
        }),
        sources = cmp.config.sources({
          { name = "nvim_lsp" },
          { name = "luasnip" },
          { name = "buffer" },
          { name = "path" },
        }),
      })
    end,
  },
}