-- Test suite for vim.pos
local t = require('test.testutil')
local n = require('test.functional.testnvim')()
local eq = t.eq
local dedent = t.dedent

local clear = n.clear
local exec_lua = n.exec_lua
local insert = n.insert

describe('vim.pos', function()
  before_each(clear)

  it('creates a position', function()
    local pos, buf = exec_lua(function()
      local buf = vim.api.nvim_create_buf(false, true)
      return vim.pos(buf, 3, 5), buf
    end)
    eq(3, pos[1])
    eq(5, pos[2])
    eq(buf, pos[3])
  end)

  it('creates a position with buf=0', function()
    local pos, buf = exec_lua(function()
      return vim.pos(0, 3, 5), vim.api.nvim_get_current_buf()
    end)
    eq(3, pos[1])
    eq(5, pos[2])
    eq(buf, pos[3])
  end)

  it('comparisons by overloaded operators', function()
    local buf = exec_lua(function()
      return vim.api.nvim_create_buf(false, true)
    end)
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) < vim.pos(buf, 4, 5)
      end)
    )
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) <= vim.pos(buf, 3, 6)
      end)
    )
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) > vim.pos(buf, 2, 5)
      end)
    )
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) >= vim.pos(buf, 3, 5)
      end)
    )
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) == vim.pos(buf, 3, 5)
      end)
    )
    eq(
      true,
      exec_lua(function()
        return vim.pos(buf, 3, 5) ~= vim.pos(buf, 3, 6)
      end)
    )
  end)

  it('converts between vim.Pos and lsp.Position', function()
    local buf = exec_lua(function()
      return vim.api.nvim_get_current_buf()
    end)
    insert('Neovim 是 Vim 的分支，专注于扩展性和可用性。')
    local lsp_pos = exec_lua(function()
      local pos = vim.pos(buf, 0, 36)
      return pos:to_lsp('utf-16')
    end)
    eq({ line = 0, character = 20 }, lsp_pos)
    local pos = exec_lua(function()
      return vim.pos.lsp(buf, lsp_pos, 'utf-16')
    end)
    eq({
      0,
      36,
      buf,
    }, pos)
  end)

  it('converts between vim.Pos and buffer offset', function()
    local buf = exec_lua(function()
      return vim.api.nvim_get_current_buf()
    end)
    insert(dedent [[
      first
      second
      third
    ]])

    local offsets = exec_lua(function()
      return {
        vim.pos(buf, 0, 0):to_offset(),
        vim.pos(buf, 0, 3):to_offset(),
        vim.pos(buf, 1, 0):to_offset(),
        vim.pos(buf, 3, 0):to_offset(),
      }
    end)
    eq({ 0, 3, 6, 19 }, offsets)

    local positions = exec_lua(function()
      return {
        vim.pos.offset(buf, 0),
        vim.pos.offset(buf, 3),
        vim.pos.offset(buf, 6),
        vim.pos.offset(buf, 19),
      }
    end)
    eq({
      { 0, 0, buf },
      { 0, 3, buf },
      { 1, 0, buf },
      { 3, 0, buf },
    }, positions)
  end)
end)