local types = require('rustaceanvim.types.internal')
local cargo = require('rustaceanvim.cargo')
local compat = require('rustaceanvim.compat')
local config = require('rustaceanvim.config')
local executors = require('rustaceanvim.executors')
local os = require('rustaceanvim.os')
local server_config = require('rustaceanvim.config.server')

local RustaceanConfig

---@class RustAnalyzerInitializedStatusInternal : RustAnalyzerInitializedStatus
---@field health lsp_server_health_status
---@field quiescent boolean inactive?
---
---@param dap_adapter DapExecutableConfig | DapServerConfig | disable
---@return boolean
local function should_enable_dap_config_value(dap_adapter)
  local adapter = types.evaluate(dap_adapter)
  if adapter == false then
    return false
  end
  return vim.fn.executable('rustc') == 1
end

---@param adapter DapServerConfig | DapExecutableConfig
local function is_codelldb_adapter(adapter)
  return adapter.type == 'server'
end

---@param adapter DapServerConfig | DapExecutableConfig
local function is_lldb_adapter(adapter)
  return adapter.type == 'executable'
end

---@param type string
---@return DapClientConfig
local function load_dap_configuration(type)
  -- default
  ---@type DapClientConfig
  local dap_config = {
    name = 'Rust debug client',
    type = type,
    request = 'launch',
    stopOnEntry = false,
  }
  ---@diagnostic disable-next-line: different-requires
  local dap = require('dap')
  -- Load configurations from a `launch.json`.
  -- It is necessary to check for changes in the `dap.configurations` table, as
  -- `load_launchjs` does not return anything, it loads directly into `dap.configurations`.
  local pre_launch = vim.deepcopy(dap.configurations) or {}
  require('dap.ext.vscode').load_launchjs(nil, { lldb = { 'rust' }, codelldb = { 'rust' } })
  for name, configuration_entries in pairs(dap.configurations) do
    if pre_launch[name] == nil or not vim.deep_equal(pre_launch[name], configuration_entries) then
      -- `configurations` are tables of `configuration` entries
      -- use the first `configuration` that matches
      for _, entry in pairs(configuration_entries) do
        ---@cast entry DapClientConfig
        if entry.type == type then
          dap_config = entry
          break
        end
      end
    end
  end
  return dap_config
end

---@return RustaceanExecutor
local function get_test_executor()
  if package.loaded['rustaceanvim.neotest'] ~= nil then
    -- neotest has been set up with rustaceanvim as an adapter
    return executors.neotest
  end
  return executors.termopen
end

---@class RustaceanConfig
local RustaceanDefaultConfig = {
  ---@class RustaceanToolsConfig
  tools = {

    --- how to execute terminal commands
    --- options right now: termopen / quickfix / toggleterm / vimux
    ---@type RustaceanExecutor
    executor = executors.termopen,

    ---@type RustaceanExecutor
    test_executor = get_test_executor(),

    ---@type RustaceanExecutor
    crate_test_executor = executors.termopen,

    ---@type string | nil
    cargo_override = nil,

    ---@type boolean
    enable_nextest = true,

    ---@type boolean
    enable_clippy = true,

    --- callback to execute once rust-analyzer is done initializing the workspace
    --- The callback receives one parameter indicating the `health` of the server: "ok" | "warning" | "error"
    ---@type fun(health:RustAnalyzerInitializedStatus) | nil
    on_initialized = nil,

    --- automatically call RustReloadWorkspace when writing to a Cargo.toml file.
    ---@type boolean
    reload_workspace_from_cargo_toml = true,

    --- options same as lsp hover
    ---@see vim.lsp.util.open_floating_preview
    ---@class RustaceanHoverActionsConfig
    hover_actions = {

      --- whether to replace Neovim's built-in `vim.lsp.buf.hover`.
      ---@type boolean
      replace_builtin_hover = true,
    },

    code_actions = {
      --- text appended to a group action
      ---@type string
      group_icon = ' ▶',

      --- whether to fall back to `vim.ui.select` if there are no grouped code actions
      ---@type boolean
      ui_select_fallback = false,
    },

    --- options same as lsp hover
    ---@see vim.lsp.util.open_floating_preview
    ---@see vim.api.nvim_open_win
    ---@type table Options applied to floating windows.
    float_win_config = {
      --- whether the window gets automatically focused
      --- default: false
      ---@type boolean
      auto_focus = false,

      --- whether splits opened from floating preview are vertical
      --- default: false
      ---@type 'horizontal' | 'vertical'
      open_split = 'horizontal',
    },

    --- settings for showing the crate graph based on graphviz and the dot
    --- command
    ---@class RustaceanCrateGraphConfig
    crate_graph = {
      -- backend used for displaying the graph
      -- see: https://graphviz.org/docs/outputs/
      -- default: x11
      ---@type string
      backend = 'x11',
      -- where to store the output, nil for no output stored (relative
      -- path from pwd)
      -- default: nil
      ---@type string | nil
      output = nil,
      -- true for all crates.io and external crates, false only the local
      -- crates
      -- default: true
      ---@type boolean
      full = true,

      -- List of backends found on: https://graphviz.org/docs/outputs/
      -- Is used for input validation and autocompletion
      -- Last updated: 2021-08-26
      ---@type string[]
      enabled_graphviz_backends = {
        'bmp',
        'cgimage',
        'canon',
        'dot',
        'gv',
        'xdot',
        'xdot1.2',
        'xdot1.4',
        'eps',
        'exr',
        'fig',
        'gd',
        'gd2',
        'gif',
        'gtk',
        'ico',
        'cmap',
        'ismap',
        'imap',
        'cmapx',
        'imap_np',
        'cmapx_np',
        'jpg',
        'jpeg',
        'jpe',
        'jp2',
        'json',
        'json0',
        'dot_json',
        'xdot_json',
        'pdf',
        'pic',
        'pct',
        'pict',
        'plain',
        'plain-ext',
        'png',
        'pov',
        'ps',
        'ps2',
        'psd',
        'sgi',
        'svg',
        'svgz',
        'tga',
        'tiff',
        'tif',
        'tk',
        'vml',
        'vmlz',
        'wbmp',
        'webp',
        'xlib',
        'x11',
      },
      ---@type string | nil
      pipe = nil,
    },

    ---@type fun(url:string):nil
    open_url = function(url)
      require('rustaceanvim.os').open_url(url)
    end,
    ---settings for rustc
    ---@class RustaceanRustcConfig
    rustc = {
      ---@type string
      edition = '2021',
    },
  },

  --- all the opts to send to the LSP client
  --- these override the defaults set by rust-tools.nvim
  ---@diagnostic disable-next-line: undefined-doc-class
  ---@class RustaceanLspClientConfig: vim.lsp.ClientConfig
  server = {
    ---@type lsp.ClientCapabilities
    capabilities = server_config.create_client_capabilities(),
    ---@type boolean | fun(bufnr: integer):boolean Whether to automatically attach the LSP client.
    ---Defaults to `true` if the `rust-analyzer` executable is found.
    auto_attach = function(bufnr)
      if #vim.bo[bufnr].buftype > 0 then
        return false
      end
      local path = vim.api.nvim_buf_get_name(bufnr)
      if not os.is_valid_file_path(path) then
        return false
      end
      local cmd = types.evaluate(RustaceanConfig.server.cmd)
      ---@cast cmd string[]
      local rs_bin = cmd[1]
      return vim.fn.executable(rs_bin) == 1
    end,
    ---@type string[] | fun():string[]
    cmd = function()
      return { 'rust-analyzer', '--log-file', RustaceanConfig.server.logfile }
    end,

    ---@type string | fun(filename: string, default: fun(filename: string):string|nil):string|nil
    root_dir = cargo.get_root_dir,

    --- standalone file support
    --- setting it to false may improve startup time
    ---@type boolean
    standalone = true,

    ---@type string The path to the rust-analyzer log file.
    logfile = vim.fn.tempname() .. '-rust-analyzer.log',

    ---@type table | (fun(project_root:string|nil, default_settings: table|nil):table) -- The rust-analyzer settings or a function that creates them.
    settings = function(project_root, default_settings)
      return server_config.load_rust_analyzer_settings(project_root, { default_settings = default_settings })
    end,

    --- @type table
    default_settings = {
      --- options to send to rust-analyzer
      --- See: https://rust-analyzer.github.io/manual.html#configuration
      --- @type table
      ['rust-analyzer'] = {},
    },
    ---@type boolean Whether to search (upward from the buffer) for rust-analyzer settings in .vscode/settings json.
    load_vscode_settings = false,
  },

  --- debugging stuff
  --- @class RustaceanDapConfig
  dap = {
    --- @type boolean Whether to autoload nvim-dap configurations when rust-analyzer has attached?
    autoload_configurations = vim.fn.has('nvim-0.10.0') == 1, -- Compiling the debug build cannot be run asynchronously on Neovim < 0.10
    --- @type DapExecutableConfig | DapServerConfig | disable | fun():(DapExecutableConfig | DapServerConfig | disable)
    adapter = function()
      --- @type DapExecutableConfig | DapServerConfig | disable
      local result = false
      local has_mason, mason_registry = pcall(require, 'mason-registry')
      if has_mason and mason_registry.is_installed('codelldb') then
        local codelldb_package = mason_registry.get_package('codelldb')
        local mason_codelldb_path = compat.joinpath(codelldb_package:get_install_path(), 'extension')
        local codelldb_path = compat.joinpath(mason_codelldb_path, 'adapter', 'codelldb')
        local liblldb_path = compat.joinpath(mason_codelldb_path, 'lldb', 'lib', 'liblldb')
        local shell = require('rustaceanvim.shell')
        if shell.is_windows() then
          codelldb_path = codelldb_path .. '.exe'
          liblldb_path = compat.joinpath(mason_codelldb_path, 'lldb', 'bin', 'liblldb.dll')
        else
          liblldb_path = liblldb_path .. (shell.is_macos() and '.dylib' or '.so')
        end
        result = config.get_codelldb_adapter(codelldb_path, liblldb_path)
      elseif vim.fn.executable('codelldb') == 1 then
        ---@cast result DapServerConfig
        result = {
          type = 'server',
          host = '127.0.0.1',
          port = '${port}',
          executable = {
            command = 'codelldb',
            args = { '--port', '${port}' },
          },
        }
      else
        local has_lldb_dap = vim.fn.executable('lldb-dap') == 1
        local has_lldb_vscode = vim.fn.executable('lldb-vscode') == 1
        if not has_lldb_dap and not has_lldb_vscode then
          return result
        end
        local command = has_lldb_dap and 'lldb-dap' or 'lldb-vscode'
        ---@cast result DapExecutableConfig
        result = {
          type = 'executable',
          command = command,
          name = 'lldb',
        }
      end
      return result
    end,
    --- Accommodate dynamically-linked targets by passing library paths to lldb.
    ---@type boolean | fun():boolean
    add_dynamic_library_paths = function()
      return should_enable_dap_config_value(RustaceanConfig.dap.adapter)
    end,
    --- Auto-generate a source map for the standard library.
    ---@type boolean | fun():boolean
    auto_generate_source_map = function()
      return should_enable_dap_config_value(RustaceanConfig.dap.adapter)
    end,
    --- Get Rust types via initCommands (rustlib/etc/lldb_commands).
    ---@type boolean | fun():boolean
    load_rust_types = function()
      if not should_enable_dap_config_value(RustaceanConfig.dap.adapter) then
        return false
      end
      local adapter = types.evaluate(RustaceanConfig.dap.adapter)
      ---@cast adapter DapExecutableConfig | DapServerConfig | disable
      return adapter ~= false and is_lldb_adapter(adapter)
    end,
    --- @type DapClientConfig | disable | fun():(DapClientConfig | disable)
    configuration = function()
      local ok, _ = pcall(require, 'dap')
      if not ok then
        return false
      end
      local adapter = types.evaluate(RustaceanConfig.dap.adapter)
      ---@cast adapter DapExecutableConfig | DapServerConfig | disable
      if adapter == false then
        return false
      end
      ---@cast adapter DapExecutableConfig | DapServerConfig
      local type = is_codelldb_adapter(adapter) and 'codelldb' or 'lldb'
      return load_dap_configuration(type)
    end,
  },
  -- debug info
  was_g_rustaceanvim_sourced = vim.g.rustaceanvim ~= nil,
}
local rustaceanvim = vim.g.rustaceanvim or {}
local opts = type(rustaceanvim) == 'function' and rustaceanvim() or rustaceanvim
for _, executor in pairs { 'executor', 'test_executor', 'crate_test_executor' } do
  if opts.tools and opts.tools[executor] and type(opts.tools[executor]) == 'string' then
    opts.tools[executor] = assert(executors[opts.tools[executor]], 'Unknown RustaceanExecutor')
  end
end

---@type RustaceanConfig
RustaceanConfig = vim.tbl_deep_extend('force', {}, RustaceanDefaultConfig, opts)

-- Override user dap.adapter config in a backward compatible way
if opts.dap and opts.dap.adapter then
  local user_adapter = opts.dap.adapter
  local default_adapter = types.evaluate(RustaceanConfig.dap.adapter)
  if
    type(user_adapter) == 'table'
    and type(default_adapter) == 'table'
    and user_adapter.type == default_adapter.type
  then
    ---@diagnostic disable-next-line: inject-field
    RustaceanConfig.dap.adapter = vim.tbl_deep_extend('force', default_adapter, user_adapter)
  elseif user_adapter ~= nil then
    ---@diagnostic disable-next-line: inject-field
    RustaceanConfig.dap.adapter = user_adapter
  end
end

local check = require('rustaceanvim.config.check')
local ok, err = check.validate(RustaceanConfig)
if not ok then
  vim.notify('rustaceanvim: ' .. err, vim.log.levels.ERROR)
end

return RustaceanConfig