local M = {}

-- Default config
M.config = {
  project_root = "~/Projects",
}

-- Function to setup the plugin
function M.setup(opts)
  M.config = vim.tbl_deep_extend("force", M.config, opts or {})

  -- Register user commands
  vim.api.nvim_create_user_command("NewJavaProject", M.create_project, {})
  vim.api.nvim_create_user_command("NewJavaFile", M.create_new_file, {})
  vim.api.nvim_create_user_command("JavaBuild", M.build, {})
  vim.api.nvim_create_user_command("JavaRun", M.run, {})
end

-- Create a new Java project
function M.create_project()
  vim.ui.input({ prompt = "Enter project name: " }, function(project_name)
    if not project_name or project_name == "" then
      print("Project creation canceled.")
      return
    end

    local project_root = vim.fn.expand(M.config.project_root) .. "/" .. project_name
    local src_dir = project_root .. "/root/src"
    local out_dir = project_root .. "/root/out"

    -- Create directories
    vim.fn.mkdir(src_dir, "p")
    vim.fn.mkdir(out_dir, "p")

    -- Write Main.java
    local main_java_path = src_dir .. "/Main.java"
    local main_java_content = [[
public class Main {
    public static void main(String[] args) {
        System.out.println("Hello, World!");
    }
}
]]
    local file = io.open(main_java_path, "w")
    if file then
      file:write(main_java_content)
      file:close()
      vim.cmd("edit " .. main_java_path)
      print("Project '" .. project_name .. "' created at " .. project_root)
    else
      print("Error creating Main.java")
    end
  end)
end

-- Create a new Java file
function M.create_new_file()
  vim.ui.input({ prompt = "Enter class name: " }, function(class_name)
    if not class_name or class_name == "" then
      print("Class creation canceled.")
      return
    end

    local current_dir = vim.fn.expand("%:p:h")
    local root_dir = current_dir:match("(.*)/root/src")
    if not root_dir then
      print("Error: src directory not found.")
      return
    end

    local java_file_path = root_dir .. "/root/src/" .. class_name .. ".java"
    local java_content = string.format([[
public class %s {
    // New File
}
]], class_name)

    local file = io.open(java_file_path, "w")
    if file then
      file:write(java_content)
      file:close()
      vim.cmd("edit " .. java_file_path)
      print(class_name .. ".java created successfully!")
    else
      print("Error creating " .. class_name .. ".java")
    end
  end)
end

-- Compile Java files
function M.build()
  local current_dir = vim.fn.expand("%:p:h")
  local project_root = current_dir:match("(.*)/root/src")
  if not project_root then
    print("Error: Must be inside the 'src' directory.")
    return
  end

  local src_dir = project_root .. "/root/src"
  local out_dir = project_root .. "/root/out"

  vim.fn.mkdir(out_dir, "p")
  local compile_command = string.format("javac -d %s %s/*.java", out_dir, src_dir)
  local compile_status = vim.fn.system(compile_command)

  if vim.v.shell_error ~= 0 then
    print("Error during compilation:\n" .. compile_status)
  else
    print("Compilation successful!")
  end
end

-- Open floating terminal
local function open_float_terminal(cmd)
  local ui = vim.api.nvim_list_uis()[1]
  local width, height = math.floor(ui.width * 0.9), math.floor(ui.height * 0.9)
  local row, col = math.floor(ui.height * 0.05), math.floor(ui.width * 0.05)

  local buf = vim.api.nvim_create_buf(false, true)
  local win = vim.api.nvim_open_win(buf, true, {
    relative = "editor", width = width - 10, height = height - 10,
    row = row + 5, col = col + 5, style = "minimal", border = "rounded"
  })

  vim.api.nvim_win_set_option(win, "winblend", vim.o.pumblend)
  vim.api.nvim_win_set_option(win, "winhighlight", "Normal:Pmenu,FloatBorder:Pmenu")

  vim.fn.termopen(cmd)
  vim.cmd("startinsert")

  vim.api.nvim_buf_set_keymap(buf, "t", "<Esc>", "<C-\\><C-n>:q<CR>", { noremap = true, silent = true })
  return buf, win
end

-- Run Java program in floating terminal
function M.run()
  local current_dir = vim.fn.expand("%:p:h")
  local project_root = current_dir:match("(.*)/root/src")
  if not project_root then
    print("Error: Must be inside the 'src' directory.")
    return
  end

  local out_dir = project_root .. "/root/out"
  open_float_terminal("java -cp " .. out_dir .. " Main")
end

return M