local M = {}

local opts = {
    -- Priority list of preferred backends for aerial.
    -- This can be a filetype map (see :help aerial-filetype-map)
    backends = { "treesitter", "lsp", "markdown", "man" },

    layout = {
        -- These control the width of the aerial window.
        -- They can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
        -- min_width and max_width can be a list of mixed types.
        -- max_width = {40, 0.2} means "the lesser of 40 columns or 20% of total"
        max_width = { 40, 0.2 },
        width = nil,
        min_width = 10,

        -- Determines the default direction to open the aerial window. The 'prefer'
        -- options will open the window in the other direction *if* there is a
        -- different buffer in the way of the preferred direction
        -- Enum: prefer_right, prefer_left, right, left, float
        default_direction = "prefer_right",

        -- Determines where the aerial window will be opened
        --   edge   - open aerial at the far right/left of the editor
        --   window - open aerial to the right/left of the current window
        placement = "edge",
    },

    -- Determines how the aerial window decides which buffer to display symbols for
    --   window - aerial window will display symbols for the buffer in the window from which it was opened
    --   global - aerial window will display symbols for the current window
    attach_mode = "global",

    -- List of enum values that configure when to auto-close the aerial window
    --   unfocus       - close aerial when you leave the original source window
    --   switch_buffer - close aerial when you change buffers in the source window
    --   unsupported   - close aerial when attaching to a buffer that has no symbol source
    close_automatic_events = {},

    -- Set to false to remove the default keybindings for the aerial buffer
    default_bindings = true,

    -- Disable aerial on files with this many lines
    disable_max_lines = 10000,

    -- Disable aerial on files this size or larger (in bytes)
    disable_max_size = 2000000, -- Default 2MB

    -- A list of all symbols to display. Set to false to display all symbols.
    -- This can be a filetype map (see :help aerial-filetype-map)
    -- To see all available values, see :help SymbolKind
    filter_kind = {
        "Class",
        "Constructor",
        "Enum",
        "Function",
        "Interface",
        "Module",
        "Method",
        "Struct",
    },

    -- Determines line highlighting mode when multiple splits are visible.
    -- split_width   Each open window will have its cursor location marked in the
    --               aerial buffer. Each line will only be partially highlighted
    --               to indicate which window is at that location.
    -- full_width    Each open window will have its cursor location marked as a
    --               full-width highlight in the aerial buffer.
    -- last          Only the most-recently focused window will have its location
    --               marked in the aerial buffer.
    -- none          Do not show the cursor locations in the aerial window.
    highlight_mode = "split_width",

    -- Highlight the closest symbol if the cursor is not exactly on one.
    highlight_closest = true,

    -- Highlight the symbol in the source buffer when cursor is in the aerial win
    highlight_on_hover = false,

    -- When jumping to a symbol, highlight the line for this many ms.
    -- Set to false to disable
    highlight_on_jump = 300,

    -- Define symbol icons. You can also specify "<Symbol>Collapsed" to change the
    -- icon when the tree is collapsed at that symbol, or "Collapsed" to specify a
    -- default collapsed icon. The default icon set is determined by the
    -- "nerd_font" option below.
    -- If you have lspkind-nvim installed, it will be the default icon set.
    -- This can be a filetype map (see :help aerial-filetype-map)
    icons = {},

    -- Control which windows and buffers aerial should ignore.
    -- If attach_mode is "global", focusing an ignored window/buffer will
    -- not cause the aerial window to update.
    -- If open_automatic is true, focusing an ignored window/buffer will not
    -- cause an aerial window to open.
    -- If open_automatic is a function, ignore rules have no effect on aerial
    -- window opening behavior; it's entirely handled by the open_automatic
    -- function.
    ignore = {
        -- Ignore unlisted buffers. See :help buflisted
        unlisted_buffers = true,

        -- List of filetypes to ignore.
        filetypes = {},

        -- Ignored buftypes.
        -- Can be one of the following:
        -- false or nil - No buftypes are ignored.
        -- "special"    - All buffers other than normal buffers are ignored.
        -- table        - A list of buftypes to ignore. See :help buftype for the
        --                possible values.
        -- function     - A function that returns true if the buffer should be
        --                ignored or false if it should not be ignored.
        --                Takes two arguments, `bufnr` and `buftype`.
        buftypes = "special",

        -- Ignored wintypes.
        -- Can be one of the following:
        -- false or nil - No wintypes are ignored.
        -- "special"    - All windows other than normal windows are ignored.
        -- table        - A list of wintypes to ignore. See :help win_gettype() for the
        --                possible values.
        -- function     - A function that returns true if the window should be
        --                ignored or false if it should not be ignored.
        --                Takes two arguments, `winid` and `wintype`.
        wintypes = "special",
    },

    -- When you fold code with za, zo, or zc, update the aerial tree as well.
    -- Only works when manage_folds = true
    link_folds_to_tree = true,

    -- Fold code when you open/collapse symbols in the tree.
    -- Only works when manage_folds = true
    link_tree_to_folds = false,

    -- Use symbol tree for folding. Set to true or false to enable/disable
    -- 'auto' will manage folds if your previous foldmethod was 'manual'
    manage_folds = true,

    -- Set default symbol icons to use patched font icons (see https://www.nerdfonts.com/)
    -- "auto" will set it to true if nvim-web-devicons or lspkind-nvim is installed.
    nerd_font = "auto",

    -- Call this function when aerial attaches to a buffer.
    -- Useful for setting keymaps. Takes a single `bufnr` argument.
    on_attach = nil,

    -- Call this function when aerial first sets symbols on a buffer.
    -- Takes a single `bufnr` argument.
    on_first_symbols = nil,

    -- Automatically open aerial when entering supported buffers.
    -- This can be a function (see :help aerial-open-automatic)
    open_automatic = false,

    -- Run this command after jumping to a symbol (false will disable)
    post_jump_cmd = "normal! zz",

    -- When true, aerial will automatically close after jumping to a symbol
    close_on_select = false,

    -- Show box drawing characters for the tree hierarchy
    show_guides = false,

    -- The autocmds that trigger symbols update (not used for LSP backend)
    update_events = "TextChanged,InsertLeave",

    -- Customize the characters used when show_guides = true
    guides = {
        -- When the child item has a sibling below it
        mid_item = "├─",
        -- When the child item is the last in the list
        last_item = "└─",
        -- When there are nested child guides to the right
        nested_top = "│ ",
        -- Raw indentation
        whitespace = "  ",
    },

    -- Options for opening aerial in a floating win
    float = {
        -- Controls border appearance. Passed to nvim_open_win
        border = "rounded",

        -- Determines location of floating window
        --   cursor - Opens float on top of the cursor
        --   editor - Opens float centered in the editor
        --   win    - Opens float centered in the window
        relative = "cursor",

        -- These control the height of the floating window.
        -- They can be integers or a float between 0 and 1 (e.g. 0.4 for 40%)
        -- min_height and max_height can be a list of mixed types.
        -- min_height = {8, 0.1} means "the greater of 8 rows or 10% of total"
        max_height = 0.9,
        height = nil,
        min_height = { 8, 0.1 },

        override = function(conf, source_winid)
            -- This is the config that will be passed to nvim_open_win.
            -- Change values here to customize the layout
            return conf
        end,
    },

    lsp = {
        -- Fetch document symbols when LSP diagnostics update.
        -- If false, will update on buffer changes.
        diagnostics_trigger_update = true,

        -- Set to false to not update the symbols when there are LSP errors
        update_when_errors = true,

        -- How long to wait (in ms) after a buffer change before updating
        -- Only used when diagnostics_trigger_update = false
        update_delay = 300,
    },

    treesitter = {
        -- How long to wait (in ms) after a buffer change before updating
        update_delay = 300,
    },

    markdown = {
        -- How long to wait (in ms) after a buffer change before updating
        update_delay = 300,
    },

    man = {
        -- How long to wait (in ms) after a buffer change before updating
        update_delay = 300,
    },
}

M.setup = function()
    require("aerial").setup(opts)
end

return M