-- Debug Adapter Protocol (DAP) configuration for Go & JS
-- Uses delve for Go debugging
-- Loads only when a <leader>d* key is pressed (see keys = {...} below).

return {
  -- ─────────────────────────────────────────────────────────────────────────
  -- Core DAP + Go adapter + UI extras
  -- ─────────────────────────────────────────────────────────────────────────
  {
    "mfussenegger/nvim-dap",
    dependencies = {
      -- Fold these under nvim-dap so they share its keys-based lazy trigger
      -- instead of loading eagerly at startup.
      { "rcarriga/nvim-dap-ui", dependencies = { "nvim-neotest/nvim-nio" } },
      "theHamsta/nvim-dap-virtual-text",
      "jay-babu/mason-nvim-dap.nvim",
      {
        "leoluz/nvim-dap-go",
        -- IMPORTANT: opts is a FUNCTION, not a table literal.
        -- The attach config references require("dap.utils"), which must not run until
        -- nvim-dap is actually loaded.
        opts = function()
          return {
            delve = {
              path = "dlv",
              initialize_timeout_sec = 20,
              port = "${port}",
              build_flags = "",
            },
            dap_configurations = {
              { type = "go", name = "Debug", request = "launch", program = "${file}" },
              { type = "go", name = "Debug Test", request = "launch", program = "${file}" },
              { type = "go", name = "Debug Package", request = "launch", program = "${filDirname}" },
              {
                type = "go",
                name = "Debug test (go.mod)",
                request = "launch",
                mode = "test",
                program = "./${relativeFileDirname}",
              },
              {
                type = "go",
                name = "Attach",
                request = "attach",
                mode = "local",
                processId = require("dap.utils").pick_process,
              },
            },
          }
        end,
      },
    },
    keys = {
      {
        "<leader>dB",
        function()
          require("dap").set_breakpoint(vim.fn.input("Breakpoint condition: "))
        end,
        desc = "Breakpoint Condition",
      },
      {
        "<leader>db",
        function()
          require("dap").toggle_breakpoint()
        end,
        desc = "Toggle Breakpoint",
      },
      {
        "<leader>dc",
        function()
          require("dap").continue()
        end,
        desc = "Continue",
      },
      {
        "<leader>dC",
        function()
          require("dap").run_to_cursor()
        end,
        desc = "Run to Cursor",
      },
      {
        "<leader>dg",
        function()
          require("dap").goto_()
        end,
        desc = "Go to Line (No Execute)",
      },
      {
        "<leader>di",
        function()
          require("dap").step_into()
        end,
        desc = "Step Into",
      },
      {
        "<leader>dj",
        function()
          require("dap").down()
        end,
        desc = "Down",
      },
      {
        "<leader>dk",
        function()
          require("dap").up()
        end,
        desc = "Up",
      },
      {
        "<leader>dO",
        function()
          require("dap").step_over()
        end,
        desc = "Step Over",
      },
      {
        "<leader>dp",
        function()
          require("dap").pause()
        end,
        desc = "Pause",
      },
      {
        "<leader>dr",
        function()
          require("dap").repl.toggle()
        end,
        desc = "Toggle REPL",
      },
      {
        "<leader>ds",
        function()
          require("dap").session()
        end,
        desc = "Session",
      },
      {
        "<leader>dt",
        function()
          require("dap").terminate()
        end,
        desc = "Terminate",
      },
      {
        "<leader>dw",
        function()
          require("dap.ui.widgets").hover()
        end,
        desc = "Widgets",
      },
      -- Go-specific
      {
        "<leader>dT",
        function()
          require("dap-go").debug_test()
        end,
        desc = "Debug Go Test",
      },
      {
        "<leader>dL",
        function()
          require("dap-go").debug_last_test()
        end,
        desc = "Debug Last Go Test",
      },
    },
  },

  -- ─────────────────────────────────────────────────────────────────────────
  -- DAP UI keymaps + auto open/close (the spec itself is loaded as a dep above)
  -- ─────────────────────────────────────────────────────────────────────────
  {
    "rcarriga/nvim-dap-ui",
    keys = {
      {
        "<leader>du",
        function()
          require("dapui").toggle({})
        end,
        desc = "Dap UI",
      },
      {
        "<leader>de",
        function()
          require("dapui").eval()
        end,
        desc = "Eval",
        mode = { "n", "v" },
      },
    },
    opts = {
      layouts = {
        {
          elements = {
            { id = "scopes", size = 0.25 },
            { id = "breakpoints", size = 0.25 },
            { id = "stacks", size = 0.25 },
            { id = "watches", size = 0.25 },
          },
          position = "left",
          size = 40,
        },
        {
          elements = {
            { id = "repl", size = 0.5 },
            { id = "console", size = 0.5 },
          },
          position = "bottom",
          size = 10,
        },
      },
    },
    config = function(_, opts)
      local dap = require("dap")
      local dapui = require("dapui")

      dapui.setup(opts)
      -- Auto open/close DAP UI on debug session start/end
      dap.listeners.after.event_initialized["dapui_config"] = function()
        dapui.open({})
      end
      dap.listeners.before.event_terminated["dapui_config"] = function()
        dapui.close({})
      end
      dap.listeners.before.event_exited["dapui_config"] = function()
        dapui.close({})
      end
    end,
  },

  -- ─────────────────────────────────────────────────────────────────────────
  -- mason-nvim-dap: install DAP adapters via Mason
  -- ─────────────────────────────────────────────────────────────────────────
  -- Note: delve and js-debug-adapter are also listed in mason.lua's
  -- ensure_installed (under "DAP adapters"). Either source
  -- can install them; mason-nvim-dap is preferred when present because it also
  -- auto-registers the adapters with nvim-dap.
  {
    "jay-babu/mason-nvim-dap.nvim",
    opts = {
      ensure_installed = { "python", "delve", "js" },
    },
  },

  -- ─────────────────────────────────────────────────────────────────────────
  -- Inline variable values during debug sessions
  -- ─────────────────────────────────────────────────────────────────────────
  {
    "theHamsta/nvim-dap-virtual-text",
    opts = {
      enabled = true,
      enabled_commands = true,
      highlight_changed_variables = true,
      highlight_new_as_changed = false,
      show_stop_reason = true,
      commented = false,
      only_first_definition = true,
      all_references = false,
      filter_references_pattern = "<module",
      virt_text_pos = "eol",
      all_frames = false,
      virt_lines = false,
      virt_text_win_col = nil,
    },
  },
}