local M = {}

local function hex_to_rgba(hex)
  local h = hex:gsub("#", "")
  if #h ~= 6 then
    return 0, 0, 0, 255
  end

  local r = tonumber(h:sub(1, 2), 16) or 0
  local g = tonumber(h:sub(3, 4), 16) or 0
  local b = tonumber(h:sub(5, 6), 16) or 0
  return r, g, b, 255
end

local function current_buffer_label()
  local path = editor.buffer_path()
  if not path then
    return "*scratch*"
  end
  return path
end

function M.update_modeline(state)
  if not state.mode_line_buffer then
    return
  end

  local dirty = editor.buffer_modified() and "*" or "-"
  local cmd_mode = string.format("[%s-cmd]", state.command_kind or "lua")
  local mode = state.command_mode and cmd_mode or string.format("[%s]", state.mode or "normal")
  local leader = state.leader_pending and " [leader]" or ""
  local text = string.format("lemacs %s | %s | %s %s%s", dirty, current_buffer_label(), state.current_theme, mode, leader)
  editor.aux_buffer_set_text(state.mode_line_buffer, text)
end

function M.set_message(state, text)
  state.message_text = text
  if state.message_buffer then
    editor.aux_buffer_set_text(state.message_buffer, text)
  end
end

function M.update_commandline_buffer(state)
  if not state.command_buffer then
    return
  end
  local prefix = (state.command_kind == "command") and ":" or ":lua "
  editor.aux_buffer_set_text(state.command_buffer, prefix .. state.command_text)
end

function M.setup_layout(state, palette)
  local width = editor.screen_width()
  local height = editor.screen_height()
  local mode_h = 28
  local msg_h = 24
  local cmd_h = state.command_mode and 24 or 0
  local body_h = height - mode_h - msg_h - cmd_h
  if body_h < 1 then
    body_h = 1
  end

  local base00_r, base00_g, base00_b = hex_to_rgba(palette.base00)
  local base01_r, base01_g, base01_b = hex_to_rgba(palette.base01)
  local base02_r, base02_g, base02_b = hex_to_rgba(palette.base02)
  local base03_r, base03_g, base03_b = hex_to_rgba(palette.base03)
  local base05_r, base05_g, base05_b = hex_to_rgba(palette.base05)
  local base06_r, base06_g, base06_b = hex_to_rgba(palette.base06)
  local base09_r, base09_g, base09_b = hex_to_rgba(palette.base09)

  editor.layout_reset()
  editor.layout_add_view(0, 0, 0, 0, width, body_h, true, base00_r, base00_g, base00_b, 255, base05_r, base05_g, base05_b, 255)
  editor.layout_add_view(1, state.mode_line_buffer, 0, body_h, width, mode_h, false, base02_r, base02_g, base02_b, 235, base06_r, base06_g, base06_b, 255)
  editor.layout_add_view(1, state.message_buffer, 0, body_h + mode_h, width, msg_h, false, base01_r, base01_g, base01_b, 240, base09_r, base09_g, base09_b, 255)

  if state.command_mode then
    editor.layout_add_view(1, state.command_buffer, 0, body_h + mode_h + msg_h, width, cmd_h, false, base03_r, base03_g, base03_b, 245, base06_r, base06_g, base06_b, 255)
  end
end

function M.current_buffer_label()
  return current_buffer_label()
end

return M