"=============================================================================
" VersionControl.vim --- SpaceVim version control layer
" Copyright (c) 2016-2017 Wang Shidong & Contributors
" Author: Wang Shidong < wsdjeg at 163.com >
" URL: https://spacevim.org
" License: GPLv3
"=============================================================================

scriptencoding utf-8

function! SpaceVim#layers#VersionControl#plugins() abort
  let plugins = []
  call add(plugins, ['mhinz/vim-signify', {'merged' : 0}])
  call add(plugins, ['tpope/vim-fugitive',   { 'merged' : 0}])
  return plugins
endfunction

function! SpaceVim#layers#VersionControl#config() abort
  let g:_spacevim_mappings_space.g = get(g:_spacevim_mappings_space, 'g',  {'name' : '+VersionControl/git'})
  let g:_spacevim_mappings_space.g.v = get(g:_spacevim_mappings_space.g, 'v',  {'name' : '+VersionControl'})
  call SpaceVim#mapping#space#def('nnoremap', ['g', '.'], 'call call('
        \ . string(s:_function('s:buffer_transient_state')) . ', [])',
        \ 'buffer transient state', 1)
  call SpaceVim#layers#core#statusline#register_sections('vcs', s:_function('s:git_branch'))
  call SpaceVim#layers#core#statusline#register_sections('hunks', s:_function('s:hunks'))
  call add(g:spacevim_statusline_left_sections, 'vcs')
  call add(g:spacevim_statusline_left_sections, 'hunks')
  call SpaceVim#mapping#space#def('nnoremap', ['t', 'm', 'v'], 'call SpaceVim#layers#core#statusline#toggle_section("vcs")',
        \ 'version control info', 1)
  call SpaceVim#mapping#space#def('nnoremap', ['t', 'm', 'h'], 'call SpaceVim#layers#core#statusline#toggle_section("hunks")',
        \ 'toggle the hunks summary', 1)
endfunction

"  master
function! s:git_branch() abort
  if exists('g:loaded_fugitive')
    let l:head = fugitive#head()
    if empty(l:head)
      call fugitive#detect(getcwd())
      let l:head = fugitive#head()
    endif
    return empty(l:head) ? '' : '  '.l:head . ' '
  endif
  return ''
endfunction

" +0 ~0 -0 
function! s:hunks() abort
  let hunks = [0,0,0]
  try
    let hunks = sy#repo#get_stats()
  catch
  endtry
  let rst = ''
  if hunks[0] > 0
    let rst .= hunks[0] . '+ '
  endif
  if hunks[1] > 0
    let rst .= hunks[1] . '~ '
  endif
  if hunks[2] > 0
    let rst .= hunks[2] . '- '
  endif
  return empty(rst) ? '' : ' ' . rst
endfunction

" vcs transient state functions:

" first we need to open a buffer contains:
" Switches
"  -g Show graph (--graph)
"  -c Show graph in color (--color)
"
" Options
"  =n Limit number of commits (-n"256")
"  =f Limit to files (-- )
"  =a Limit to author (--author=)
"
" Actions
"  l Log current
let s:git_log_switches = {
      \ 'g' : {'desc' : 'Show graph', 'option' : '--graph'},
      \ 'c' : {'desc' : 'Show graph in color', 'option' : '--color'},
      \ 'd' : {'desc' : 'Show refnames', 'option' : '--decorate'},
      \ 'S' : {'desc' : 'Show signatures', 'option' : '--show-signature'},
      \ 'u' : {'desc' : 'Show diffs', 'option' : '--patch'},
      \ 's' : {'desc' : 'Show diffstats', 'option' : '--stat'},
      \ 'h' : {'desc' : 'Show header', 'option' : '++header'},
      \ 'D' : {'desc' : 'Simplify by decoration', 'option' : '--simplify-by-decoration'},
      \ 'f' : {'desc' : 'Follow renames when showing single-file log', 'option' : '--follow'},
      \ }
let s:git_log_options = {
      \ 'n' : {'desc' : 'Limit number of commits', 'option' : '-n'},
      \ 'f' : {'desc' : 'Limit to files', 'option' : '--'},
      \ 'a' : {'desc' : 'Limit to author', 'option' : '--author='},
      \ 'o' : {'desc' : 'Order commits by', 'option' : '++order='},
      \ 'g' : {'desc' : 'Search messages', 'option' : '--grep='},
      \ 'G' : {'desc' : 'Search changes', 'option' : '-G'},
      \ 'S' : {'desc' : 'Search occurrences', 'option' : '-S'},
      \ 'L' : {'desc' : 'Trace line evolution', 'option' : '-L'},
      \ }
let s:git_log_actions = {
      \ 'l' : {'desc' : 'Log current'},
      \ 'o' : {'desc' : 'Log other'},
      \ 'h' : {'desc' : 'Log HEAD'},
      \ 'L' : {'desc' : 'Log local branches'},
      \ 'b' : {'desc' : 'Log all branches'},
      \ 'a' : {'desc' : 'Log all references'},
      \ 'r' : {'desc' : 'Reflog current'},
      \ 'O' : {'desc' : 'Reflog other'},
      \ 'H' : {'desc' : 'Reflog HEAD'},
      \ }
function! s:generate_git_log_popup_content() abort
  let lines = ['Switches']
  for k in keys(s:git_log_switches)
    call add(lines, ' -' . k . ' ' . s:git_log_switches[k]['desc'] . '(' . s:git_log_switches[k]['option'] . ')')
  endfor
  call add(lines, '')
  call add(lines, 'Options')
  for k in keys(s:git_log_options)
    call add(lines, ' =' . k . ' ' . s:git_log_options[k]['desc'] . '(' . s:git_log_options[k]['option'] . ')')
  endfor
  call add(lines, '')
  call add(lines, 'Actions')
  let actions_line = ''
  let i = 0
  for k in ['l', 'L', 'r', 'o', 'b', 'O', 'h', 'a', 'H']
    let i += 1
    let actions_line .= ' ' . k . ' ' . s:git_log_actions[k]['desc']
    let actions_line .= repeat(' ', i % 3 * 30 - len(actions_line))
    if i%3 == 0
      call add(lines, actions_line)
      let actions_line = ''
    endif
  endfor
  if !empty(actions_line)
      call add(lines, actions_line)
      let actions_line = ''
  endif
  return lines
endfunction

function! s:open_log_popup_buffer() abort
  let content = s:generate_git_log_popup_content()
  exe 'rightbelow ' . len(content) . 'split __SpaceVim_git_log_popup__'
  setlocal buftype=nofile bufhidden=wipe nobuflisted nolist noswapfile nowrap cursorline nospell nonumber norelativenumber nocursorline
  setfiletype SpaceVimGitLogPopup
  call setline(1, content)
endfunction

function! Gitlog() abort
  call s:open_log_popup_buffer()
endfunction


function! s:show_repo_log() abort

endfunction

function! s:show_diff_of_unstaged_hunks() abort

endfunction

function! s:fetch_repo() abort

endfunction

function! s:pull_repo() abort

endfunction

function! s:push_repo() abort

endfunction

function! s:commit_popup() abort

endfunction

function! s:commit() abort

endfunction

function! s:revert_hunk() abort
  
endfunction

function! s:stage_hunk() abort
  
endfunction

function! s:show_hunk_diff() abort
  
endfunction

function! s:buffer_transient_state() abort
  let state = SpaceVim#api#import('transient_state') 
  call state.set_title('VCS Transient State')
  call state.defind_keys(
        \ {
        \ 'layout' : 'vertical split',
        \ 'left' : [
        \ {
        \ 'key' : 'n',
        \ 'desc' : 'next hunk',
        \ 'func' : '',
        \ 'cmd' : 'normal ]c',
        \ 'exit' : 0,
        \ },
        \ {
        \ 'key' : ['N', 'p'],
        \ 'desc' : 'previous hunk',
        \ 'func' : '',
        \ 'cmd' : 'normal [c',
        \ 'exit' : 0,
        \ },
        \ {
        \ 'key' : {
        \ 'name' : 'r/s/h',
        \ 'pos' : [[0,1], [2,3], [4,5]],
        \ 'handles' : [
        \ ['r' , 'call call(' . string(s:_function('s:revert_hunk')) . ', [])'],
        \ ['s' , 'call call(' . string(s:_function('s:stage_hunk')) . ', [])'],
        \ ['h' , 'call call(' . string(s:_function('s:show_hunk_diff')) . ', [])'],
        \ ],
        \ },
        \ 'desc' : 'revert/stage/show hunk',
        \ 'func' : '',
        \ 'cmd' : '',
        \ 'exit' : 0,
        \ },
        \ {
        \ 'key' : 't',
        \ 'desc' : 'toggle diff signs',
        \ 'func' : '',
        \ 'cmd' : 'SignifyToggle',
        \ 'exit' : 0,
        \ },
        \ ],
        \ 'right' : [
        \ {
        \ 'key' : {
        \ 'name' : 'w/u',
        \ 'pos': [[0,1], [2,3]],
        \ 'handles' : [
        \ ['w', 'Gina add %'],
        \ ['u', 'Gina reset %'],
        \ ],
        \ },
        \ 'desc' : 'stage/unstage in current file',
        \ 'func' : '',
        \ 'cmd' : '',
        \ 'exit' : 0,
        \ },
        \ {
        \ 'key' : {
        \ 'name' : 'c/C',
        \ 'pos' : [[0,1], [2,3]],
        \ 'handles' : [
        \ ['c' , 'call call(' . string(s:_function('s:commit_popup')) . ', [])'],
        \ ['C' , 'call call(' . string(s:_function('s:commit')) . ', [])'],
        \ ],
        \ },
        \ 'desc' : 'commit with popup/direct commit',
        \ 'func' : '',
        \ 'cmd' : '',
        \ 'exit' : 1,
        \ },
        \ {
        \ 'key' : {
        \ 'name' : 'f/F/P',
        \ 'pos' : [[0,1], [2,3], [4,5]],
        \ 'handles' : [
        \ ['f' , 'call call(' . string(s:_function('s:fetch_repo')) . ', [])'],
        \ ['F' , 'call call(' . string(s:_function('s:pull_repo')) . ', [])'],
        \ ['P' , 'call call(' . string(s:_function('s:push_repo')) . ', [])'],
        \ ],
        \ },
        \ 'desc' : 'fetch/pull/push popup',
        \ 'func' : '',
        \ 'cmd' : '',
        \ 'exit' : 1,
        \ },
        \ {
        \ 'key' : {
        \ 'name' : 'l/D',
        \ 'pos' : [[0,1], [2,3]],
        \ 'handles' : [
        \ ['l' , 'call call(' . string(s:_function('s:show_repo_log')) . ', [])'],
        \ ['D' , 'call call(' . string(s:_function('s:show_diff_of_unstaged_hunks')) . ', [])'],
        \ ],
        \ },
        \ 'desc' : 'log/diff popup',
        \ 'func' : '',
        \ 'cmd' : '',
        \ 'exit' : 1,
        \ },
        \ ],
        \ }
        \ )
  call state.open()
endfunction

" function() wrapper
if v:version > 703 || v:version == 703 && has('patch1170')
  function! s:_function(fstr) abort
    return function(a:fstr)
  endfunction
else
  function! s:_SID() abort
    return matchstr(expand('<sfile>'), '<SNR>\zs\d\+\ze__SID$')
  endfunction
  let s:_s = '<SNR>' . s:_SID() . '_'
  function! s:_function(fstr) abort
    return function(substitute(a:fstr, 's:', s:_s, 'g'))
  endfunction
endif