---@class lazyvim.util.ui
local M = {}

---@alias Sign {name:string, text:string, texthl:string, priority:number}

-- Returns a list of regular and extmark signs sorted by priority (low to high)
---@return Sign[]
---@param buf number
---@param lnum number
function M.get_signs(buf, lnum)
  -- Get regular signs
  ---@type Sign[]
  local signs = vim.tbl_map(function(sign)
    ---@type Sign
    local ret = vim.fn.sign_getdefined(sign.name)[1]
    ret.priority = sign.priority
    return ret
  end, vim.fn.sign_getplaced(buf, { group = "*", lnum = lnum })[1].signs)

  -- Get extmark signs
  local extmarks = vim.api.nvim_buf_get_extmarks(
    buf,
    -1,
    { lnum - 1, 0 },
    { lnum - 1, -1 },
    { details = true, type = "sign" }
  )
  for _, extmark in pairs(extmarks) do
    signs[#signs + 1] = {
      name = extmark[4].sign_hl_group or "",
      text = extmark[4].sign_text,
      texthl = extmark[4].sign_hl_group,
      priority = extmark[4].priority,
    }
  end

  -- Sort by priority
  table.sort(signs, function(a, b)
    return (a.priority or 0) < (b.priority or 0)
  end)

  return signs
end

---@return Sign?
---@param buf number
---@param lnum number
function M.get_mark(buf, lnum)
  local marks = vim.fn.getmarklist(buf)
  vim.list_extend(marks, vim.fn.getmarklist())
  for _, mark in ipairs(marks) do
    if mark.pos[1] == buf and mark.pos[2] == lnum and mark.mark:match("[a-zA-Z]") then
      return { text = mark.mark:sub(2), texthl = "DiagnosticHint" }
    end
  end
end

---@param sign? Sign
---@param len? number
function M.icon(sign, len)
  sign = sign or {}
  len = len or 2
  local text = vim.fn.strcharpart(sign.text or "", 0, len) ---@type string
  text = text .. string.rep(" ", len - vim.fn.strchars(text))
  return sign.texthl and ("%#" .. sign.texthl .. "#" .. text .. "%*") or text
end

function M.foldtext()
  local ok = pcall(vim.treesitter.get_parser, vim.api.nvim_get_current_buf())
  local ret = ok and vim.treesitter.foldtext and vim.treesitter.foldtext()
  if not ret or type(ret) == "string" then
    ret = { { vim.api.nvim_buf_get_lines(0, vim.v.lnum - 1, vim.v.lnum, false)[1], {} } }
  end
  table.insert(ret, { " " .. require("lazyvim.config").icons.misc.dots })

  if not vim.treesitter.foldtext then
    return table.concat(
      vim.tbl_map(function(line)
        return line[1]
      end, ret),
      " "
    )
  end
  return ret
end

function M.statuscolumn()
  local win = vim.g.statusline_winid
  if vim.wo[win].signcolumn == "no" then
    return ""
  end
  local buf = vim.api.nvim_win_get_buf(win)

  ---@type Sign?,Sign?,Sign?
  local left, right, fold
  for _, s in ipairs(M.get_signs(buf, vim.v.lnum)) do
    if s.name and s.name:find("GitSign") then
      right = s
    else
      left = s
    end
  end

  vim.api.nvim_win_call(win, function()
    if vim.fn.foldclosed(vim.v.lnum) >= 0 then
      fold = { text = vim.opt.fillchars:get().foldclose or "", texthl = "Folded" }
    end
  end)

  local nu = ""
  if vim.wo[win].number and vim.v.virtnum == 0 then
    nu = vim.wo[win].relativenumber and vim.v.relnum ~= 0 and vim.v.relnum or vim.v.lnum
  end

  return table.concat({
    M.icon(M.get_mark(buf, vim.v.lnum) or left),
    [[%=]],
    nu .. " ",
    M.icon(fold or right),
  }, "")
end

function M.fg(name)
  ---@type {foreground?:number}?
  ---@diagnostic disable-next-line: deprecated
  local hl = vim.api.nvim_get_hl and vim.api.nvim_get_hl(0, { name = name }) or vim.api.nvim_get_hl_by_name(name, true)
  ---@diagnostic disable-next-line: undefined-field
  local fg = hl and (hl.fg or hl.foreground)
  return fg and { fg = string.format("#%06x", fg) } or nil
end

return M