-- SCL (Siemens Structured Control Language) support for Neovim
-- Main setup module

local M = {}

function M.setup(opts)
  opts = opts or {}

  M.create_commands()

  -- Treesitter parser config
  local has_ts, ts = pcall(require, "nvim-treesitter.parsers")
  if has_ts and ts.get_parser_configs then
    local ok, parser_config = pcall(ts.get_parser_configs)
    if ok and parser_config then
      parser_config.scl = {
        install_info = {
          files = { "src/parser.c" },
          generate_requires_npm = false,
          requires_generate_from_grammar = false,
        },
        filetype = "scl",
      }
    end
  end

  -- Register blink.cmp source
  if opts.cmp then
    local function try_register()
      local cmp_ok, cmp = pcall(require, "blink.cmp")
      if cmp_ok and cmp and cmp.add_source_provider then
        local source_config = {
          name = "scl",
          module = "scl.blink_cmp_source",
          score_offset = 100,
        }
        pcall(cmp.add_source_provider, "scl", source_config)
        pcall(cmp.add_filetype_source, "scl", "scl")
        
        -- Create autocmd to trigger completion on ( for SCL files
        local augroup = vim.api.nvim_create_augroup("SCLCompletionTrigger", { clear = true })
        vim.api.nvim_create_autocmd("TextChangedI", {
          group = augroup,
          pattern = "*.scl",
          callback = function(args)
            local line = vim.api.nvim_get_current_line()
            local col = vim.api.nvim_win_get_cursor(0)[2]
            -- Check if the character before cursor is (
            if col > 0 and line:sub(col, col) == "(" then
              -- Check if there's a known FB variable before the (
              local before_paren = line:sub(1, col - 1):match("[%w_]+%s*$")
              if before_paren then
                vim.schedule(function()
                  pcall(require("blink.cmp").show, { providers = { "scl" } })
                end)
              end
            end
          end,
        })
        
        vim.notify("SCL: blink.cmp source registered", vim.log.levels.INFO)
        return true
      end
      return false
    end

    if not try_register() then
      vim.api.nvim_create_autocmd("BufEnter", {
        pattern = "*.scl",
        once = true,
        callback = try_register,
      })
    end
  end

  -- Workspace type scanner
  if opts.workspace_types ~= false then
    local workspace_types = require("scl.workspace_types")
    workspace_types.setup({
      project_root = opts.project_root,
      library_paths = opts.library_paths,
      debug = opts.debug,
    })
  end

  -- Auto-prefixing (enabled by default)
  M.setup_auto_prefix()

  -- Multiline parameters feature
  M.setup_multiline_params()
end

function M.setup_multiline_params()
  local mp = require("scl.multiline_params")

  vim.api.nvim_create_user_command("SCLMultilineParams", function()
    mp.fill_multiline_params()
  end, {})

  vim.keymap.set("i", "<Space>mp", function()
    mp.fill_multiline_params()
  end, { noremap = true, silent = true, desc = "SCL: Fill multiline parameters" })

  vim.keymap.set("i", "<Tab>", function()
    local ft = vim.bo.filetype
    if ft == "scl" or ft == "udt" then
      if mp.jump_to_next_param() then
        return ""
      end
    end
    return "<Tab>"
  end, { noremap = true, silent = true, desc = "SCL: Jump to next param or Tab" })
end

function M.setup_auto_prefix()
  require("scl.auto_prefix").setup()
end

function M.prefix_current_word()
  require("scl.auto_prefix").prefix_word()
end

function M.show_variables()
  local vars = require("scl.variables").extract_variables()
  if #vars == 0 then
    vim.notify("No local variables found", vim.log.levels.INFO)
    return
  end
  local lines = { "Local Variables:", "---" }
  for _, var in ipairs(vars) do
    local type_info = var.type and (" : " .. var.type) or ""
    table.insert(lines, "#" .. var.name .. type_info)
  end
  vim.notify(table.concat(lines, "\n"), vim.log.levels.INFO)
end

function M.show_workspace_types()
  local ws = require("scl.workspace_types")
  local udt = require("scl.udt_parser")
  local fb = require("scl.fb_parser")
  local root = ws.get_project_root()
  local udt_names = udt.get_all_udt_names()
  local fb_names = fb.get_all_fb_names()
  if not root then
    vim.notify("No project root detected", vim.log.levels.WARN)
    return
  end
  vim.notify("Project: " .. root .. "\nUDTs: " .. #udt_names .. "\nFBs/Functions: " .. #fb_names, vim.log.levels.INFO)
end

function M.rescan_workspace_types()
  local ws = require("scl.workspace_types")
  local udt = require("scl.udt_parser")
  local fb = require("scl.fb_parser")
  udt.clear_cache()
  fb.clear_cache()
  ws.clear_root_cache()
  local udt_result = ws.scan_project_udts()
  local fb_result = ws.scan_project_fbs()
  vim.notify("Scanned UDTs: " .. udt_result.parsed_count .. "/" .. udt_result.total_files .. 
            ", FBs: " .. fb_result.parsed_count .. "/" .. fb_result.total_files, vim.log.levels.INFO)
end

function M.create_commands()
  vim.api.nvim_create_user_command("SCLShowVariables", function() M.show_variables() end, {})
  vim.api.nvim_create_user_command("SCLShowWorkspaceTypes", function() M.show_workspace_types() end, {})
  vim.api.nvim_create_user_command("SCLRescanWorkspaceTypes", function() M.rescan_workspace_types() end, {})
end

return M