local map = core.misc.map

local keymap_restore = {}
--- make the default hover binding work for nvim-dap instead of lsp
local function set_hover_bind()
  for _, buf in pairs(vim.api.nvim_list_bufs()) do
    local keymaps = vim.api.nvim_buf_get_keymap(buf, "n")
    for _, keymap in pairs(keymaps) do
      if keymap.lhs == "K" then
        table.insert(keymap_restore, keymap)
        vim.api.nvim_buf_del_keymap(buf, "n", "K")
      end
    end
  end
  map("n", "K", function()
    require("dap.ui.widgets").hover(nil, {
      border = vim.g.border_style
    })
  end, { silent = true })
end

--- revert the hover bind back to whatever it was
local function unset_hover_bind()
  for _, keymap in pairs(keymap_restore) do
    if keymap.rhs then
      vim.api.nvim_buf_set_keymap(keymap.buffer, keymap.mode, keymap.lhs,
        keymap.rhs, { silent = keymap.silent == 1 })
    elseif keymap.callback then
      vim.keymap.set(keymap.mode, keymap.lhs, keymap.callback,
        { buffer = keymap.buffer, silent = keymap.silent == 1 })
    end
  end
  keymap_restore = {}
end

return {
  { "mfussenegger/nvim-dap",
    reqs = {
      "mason-org/mason.nvim",
      "nvim-telescope/telescope.nvim"
    },
    deps = "theHamsta/nvim-dap-virtual-text",
    branch = "0.10.0",
    lazy = function(load)
      load:keymap("n", "<leader>ec")
      load:keymap("n", "<leader>el")
      load:keymap("n", "<leader>et")
      load:keymap("n", "<leader>eb")
      load:keymap("n", "<leader>e]")
      load:keymap("n", "<leader>e[")
      load:keymap("n", "<leader>er")
      load:keymap("n", "<leader>eR")
    end,
    load = function()
      local dap = require("dap")

      -- define codelldb
      dap.adapters.codelldb = {
        type = "executable",
        command = "codelldb"
      }

      -- define the c configuration for codelldb
      dap.configurations.c = {
        {
          name = "Launch file",
          type = "codelldb",
          request = "launch",
          program = function()
            return vim.fn.input("Path to executable: ", vim.fn.getcwd().."/", "file")
          end,

          cwd = "${workspaceFolder}",
          stopOnEntry = false
        }
      }

      -- and define them for cpp, zig, and rust
      dap.configurations.cpp = dap.configurations.c
      dap.configurations.zig = dap.configurations.c
      dap.configurations.rust = dap.configurations.c

      -- keybinds
      map("n", "<leader>ec", dap.continue, { desc = "dap continue" })
      map("n", "<leader>el", dap.run_last, { desc = "dap run last" })
      map("n", "<leader>et", function()
        dap.terminate()
        unset_hover_bind()
      end, { desc = "dap terminate " })
      map("n", "<leader>eb", require("dap.breakpoints").toggle, {
        desc = "dap toggle breakpoint"
      })
      map("n", "<leader>e]", dap.step_over, { desc = "dap step over" })
      map("n", "<leader>e[", dap.step_back, { desc = "dap step back" })
      map("n", "<leader>er", dap.repl.toggle, { desc = "dap repl toggle" })
      map("n", "<leader>eR", dap.restart, { desc = "dap restart" })

      -- events
      dap.listeners.after["event_initialized"]["me"] = set_hover_bind
      dap.listeners.after["event_terminated"]["me"] = unset_hover_bind
    end
  },

  { "theHamsta/nvim-dap-virtual-text",
    reqs = {
      "nvim-treesitter/nvim-treesitter",
      "mfussenegger/nvim-dap"
    },
    lazy = dep_short.cmd("DapVirtualTextToggle"),
    load = function()
      require("nvim-dap-virtual-text").setup {
        virt_text_pos = vim.fn.has("nvim-0.10") == 1 and "inline" or "eol",

        --- A callback that determines how a variable is displayed or whether it should be omitted
        --- @param variable Variable https://microsoft.github.io/debug-adapter-protocol/specification#Types_Variable
        --- @param buf number
        --- @param stackframe dap.StackFrame https://microsoft.github.io/debug-adapter-protocol/specification#Types_StackFrame
        --- @param node userdata tree-sitter node identified as variable definition of reference (see `:h tsnode`)
        --- @param options nvim_dap_virtual_text_options Current options for nvim-dap-virtual-text
        --- @return string|nil A text how the virtual text should be displayed or nil, if this variable shouldn't be displayed
        display_callback = function(variable, buf, stackframe, node, options)
          -- by default, strip out new line characters
          if options.virt_text_pos == "inline" then
            return " = "..variable.value:gsub("%s+", " ")
          else
            return variable.name.." = "..variable.value:gsub("%s+", " ")
          end
        end
      }
    end
  },

  { "mfussenegger/nvim-dap-python",
    reqs = "mfussenegger/nvim-dap",
    lazy = dep_short.ft("python"),
    load = function()
      local debugpy = core.mason.get_pkg_path("debugpy", "/venv/bin/python3")
      require("dap-python").setup(debugpy)
    end
  }
}