local fzf_lua = require("fzf-lua")

local img_prev_bin = vim.fn.executable("ueberzug") == 1 and { "ueberzug" }
    or vim.fn.executable("chafa") == 1 and { "chafa" }
    or vim.fn.executable("viu") == 1 and { "viu", "-b" }
    or nil

-- return first matching highlight or nil
local function hl_match(t)
  for _, h in ipairs(t) do
    local ok, hl = pcall(vim.api.nvim_get_hl, 0, { name = h, link = false })
    if ok and type(hl) == "table" and (hl.fg or hl.bg) then
      return h
    end
  end
end

local symbol_hls = nil -- will be generated by symbol_hl fn
local symbol_icons = {
  File          = "",
  Module        = "",
  Namespace     = "󰅩",
  Package       = "",
  Class         = "󰌗",
  Method        = "󰊕",
  Property      = "",
  Field         = "",
  Constructor   = "",
  Enum          = "",
  Interface     = "󰠱",
  Function      = "󰊕",
  Variable      = "󰀫",
  Constant      = "󰏿",
  String        = "󰊄",
  Number        = "󰎠",
  Boolean       = "󰝖",
  Array         = "",
  Object        = "󰜫",
  Key           = "󰌆",
  Null          = "Ø",
  EnumMember    = "",
  Struct        = "󰙅",
  Event         = "",
  Operator      = "󰆕",
  TypeParameter = "",
}

local symbol_hl = function(s)
  if not symbol_hls then
    symbol_hls = {}
    for k, _ in pairs(symbol_icons) do
      symbol_hls[k] = hl_match({ "CmpItemKind" .. k, "@" .. k:lower(), k })
    end
    -- fallback
    symbol_hls = vim.tbl_extend("keep", symbol_hls, {
      Object = "Label",
      Key = "Keyword",
      Array = "Directory",
      Null = "Float",
      Package = "@function",
    })
  end
  return symbol_hls[s]
end

local default_opts = {
  "default-title",
  -- nvim_freeze_workaround = 1,
  -- debug_tracelog = "~/fzf-lua-trace.log",
  -- fzf_opts = { ["--info"] = "default" },
  fzf_colors = function()
    return {
      -- Set to `-1` to use neovim fg/bg, from `man fzf`:
      --   Default terminal foreground/background color
      --   (or the original color of the text)
      -- ["fg"] = { "fg", "Comment" },
      ["bg"] = "-1",
      ["hl"] = { "fg", { "NightflyPeach", "String" } },
      ["fg+"] = { "fg", "Normal" },
      ["bg+"] = { "bg", { "Visual" } },
      ["hl+"] = { "fg", { "NightflyPeach", "String" } },
      ["info"] = { "fg", { "NightflyPeach", "WarningMsg" } },
      -- ["prompt"] = { "fg", "SpecialKey" },
      ["pointer"] = { "fg", "DiagnosticError" },
      ["marker"] = { "fg", "DiagnosticError" },
      ["spinner"] = { "fg", "Label" },
      ["header"] = { "fg", "Comment" },
      ["gutter"] = "-1",
      ["scrollbar"] = { "fg", { "NightflyPeach", "WarningMsg" } },
    }
  end,
  -- winopts_fn = function()
  --   -- local split = "botright new" -- use for split under **all** windows
  --   local split = "belowright new"  -- use for split under current windows
  --   local height = math.floor(vim.o.lines * 0.3)
  --   return { split = split .. " | resize " .. tostring(height) }
  -- end,
  winopts = {
    -- split   = "belowright new",
    -- split   = "aboveleft vnew",
    height    = 0.85,
    width     = 0.80,
    row       = 0.35,
    col       = 0.55,
    -- border = { {'╭', 'IncSearch'}, {'─', 'IncSearch'},
    -- {'╮', 'IncSearch'}, '│', '╯', '─', '╰', '│' },
    preview   = {
      layout       = "flex",
      flip_columns = 130,
      scrollbar    = "float",
      -- scrolloff        = '-1',
      -- scrollchars      = {'█', '░' },
    },
    on_create = function()
      -- disable miniindentscope
      vim.b.miniindentscope_disable = true
    end,
  },
  hls = function()
    return {
      border = hl_match({ "FloatBorder", "LineNr" }),
      preview_border = hl_match({ "FloatBorder", "LineNr" }),
      cursorline = "Visual",
      cursorlinenr = "Visual",
      dir_icon = hl_match({ "NightflyGreyBlue", "Directory" }),
    }
  end,
  previewers = {
    bat = { theme = "Coldark-Dark", args = "--color=always --style=default" },
    builtin = {
      title_fnamemodify = function(s) return s end,
      ueberzug_scaler   = "cover",
      extensions        = {
        ["gif"]  = img_prev_bin,
        ["png"]  = img_prev_bin,
        ["jpg"]  = img_prev_bin,
        ["jpeg"] = img_prev_bin,
        ["svg"]  = { "chafa" },
      }
    },
  },
  actions = {
    files = {
      ["default"] = fzf_lua.actions.file_edit_or_qf,
      ["ctrl-l"]  = fzf_lua.actions.arg_add,
      ["ctrl-s"]  = fzf_lua.actions.file_split,
      ["ctrl-v"]  = fzf_lua.actions.file_vsplit,
      ["ctrl-t"]  = fzf_lua.actions.file_tabedit,
      ["ctrl-q"]  = fzf_lua.actions.file_sel_to_qf,
      ["alt-q"]   = fzf_lua.actions.file_sel_to_ll,
    }
  },
  -- all providers inherit from defaults, easier than to set this individually
  -- for git diff, commits and bcommits (we have an override for lsp.code_actions)
  defaults = { formatter = "path.filename_first" },
  buffers = { no_action_zz = true },
  files = {
    -- uncomment to override .gitignore
    -- fd_opts  = "--no-ignore --color=never --type f --hidden --follow --exclude .git",
    fzf_opts = { ["--tiebreak"] = "end" },
  },
  grep = {
    debug = false,
    rg_glob = true,
    rg_opts = [[--hidden --column --line-number --no-heading]]
        .. [[ --color=always --smart-case -g "!.git" -e]],
    fzf_opts = {
      ["--history"] = fzf_lua.path.join({ vim.fn.stdpath("data"), "fzf_search_hist" }),
    },
    actions = {
      ["ctrl-r"] = { fzf_lua.actions.grep_lgrep },
      ["ctrl-g"] = { fzf_lua.actions.toggle_ignore }
    },
  },
  tags = { actions = { ["ctrl-g"] = false, ["ctrl-r"] = { fzf_lua.actions.grep_lgrep } } },
  btags = { actions = { ["ctrl-g"] = false, ["ctrl-r"] = false } },
  git = {
    status   = {
      winopts = {
        preview = { vertical = "down:70%", horizontal = "right:70%" }
      },
    },
    commits  = { winopts = { preview = { vertical = "down:60%", } } },
    bcommits = { winopts = { preview = { vertical = "down:60%", } } },
    branches = {
      -- cmd_add = { "git", "checkout", "-b" },
      cmd_del = { "git", "branch", "--delete", "--force" },
      winopts = {
        preview = { vertical = "down:75%", horizontal = "right:75%", }
      }
    },
  },
  lsp = {
    finder = {
      providers = {
        { "definitions",     prefix = fzf_lua.utils.ansi_codes.green("def ") },
        { "declarations",    prefix = fzf_lua.utils.ansi_codes.magenta("decl") },
        { "implementations", prefix = fzf_lua.utils.ansi_codes.green("impl") },
        { "typedefs",        prefix = fzf_lua.utils.ansi_codes.red("tdef") },
        { "references",      prefix = fzf_lua.utils.ansi_codes.blue("ref ") },
        { "incoming_calls",  prefix = fzf_lua.utils.ansi_codes.cyan("in  ") },
        { "outgoing_calls",  prefix = fzf_lua.utils.ansi_codes.yellow("out ") },
      },
    },
    symbols = {
      path_shorten = 1,
      symbol_icons = symbol_icons,
      symbol_hl = symbol_hl,
      actions = { ["ctrl-g"] = false, ["ctrl-r"] = { fzf_lua.actions.sym_lsym } },
    },
    code_actions = {
      winopts = {
        relative = "cursor",
        row      = 1,
        col      = 0,
        height   = 0.4,
        preview  = { vertical = "down:70%" }
      },
      previewer = vim.fn.executable("delta") == 1 and "codeaction_native" or nil,
      preview_pager = "delta --width=$COLUMNS --hunk-header-style='omit' --file-style='omit'",
    },
  },
  diagnostics = { file_icons = false, path_shorten = 1 },
  dir_icon = "",
}

return {
  setup = function()
    -- NOT NEEDED since fzf-lua commit 604eadf
    -- custom devicons setup file to be loaded when `multiprocess = true`
    -- fzf_lua.config._devicons_setup = "~/.config/nvim/lua/plugins/devicons/setup.lua"

    fzf_lua.setup(default_opts)

    vim.api.nvim_create_augroup("FzfLuaColor", { clear = true })
    vim.api.nvim_create_autocmd("ColorScheme", {
      callback = function()
        symbol_hls = nil
      end,
      group = "FzfLuaColor",
    })
  end
}