local M = {}

M.setup = function()
  if vim.g.colors_name then
    vim.cmd 'hi clear'
  end

  if vim.fn.exists('syntax_on') then
    vim.cmd 'syntax reset'
  end

  vim.g.colors_name = 'solarized'

  local colorbuddy = require('colorbuddy')
  local Color      = colorbuddy.Color
  local C          = colorbuddy.colors
  local Group      = colorbuddy.Group
  local G          = colorbuddy.groups
  local S          = colorbuddy.styles

  -- Color Definitions
  local color_definitions = require('fs.util').colors(true)
  for name, rgb in pairs(color_definitions) do
    Color.new(name, rgb)
  end

  Color.new('fg', C.base0)
  Color.new('bg', C.base04)

  -- Standard Groups
  Group.new('Normal'      , C.fg, C.NONE, S.NONE)     -- normal text
  Group.new('NormalNC'    , G.Normal)                 -- normal text in non-current windows

  Group.new('Comment'     , C.base01, C.NONE, S.NONE) -- any comment

  Group.new('Constant'    , C.cyan, C.NONE, S.NONE)  -- any constant
  Group.new('String'      , G.Constant)  -- a string constant: "this is a string"
  Group.new('Character'   , G.Constant)  -- a character constant: 'c', '\n'
  Group.new('Number'      , G.Constant)  -- a number constant: 234, 0xff
  Group.new('Boolean'     , G.Constant)  -- a boolean constant: TRUE, false
  Group.new('Float'       , G.Constant)  -- a floating point constant: 2.3e10

  Group.new('Identifier'  , C.blue, C.NONE, S.NONE)
  Group.new('Function'    , G.Identifier)

  Group.new('Statement'   , C.yellow, C.NONE, S.NONE) -- any statement
  Group.new('Conditional' , G.Statement)  -- if, then, else, endif, switch, etc.
  Group.new('Repeat'      , G.Statement)  -- for, do, while, etc.
  Group.new('Label'       , G.Statement)  -- case, default, etc.
  Group.new('Operator'    , G.Statement)  -- "sizeof", "+", "*", etc.
  Group.new('Keyword'     , G.Statement)  -- any other keyword
  Group.new('Exception'   , G.Statement)  -- try, catch, throw

  Group.new('PreProc'     , C.orange, C.NONE, S.NONE) -- generic Preprocessor
  Group.new('Include'     , G.PreProc)  -- preprocessor #include
  Group.new('Define'      , G.PreProc)  -- preprocessor #define
  Group.new('Macro'       , G.PreProc)  -- same as Define
  Group.new('PreCondit'   , G.PreProc)  -- preprocessor #if, #else, #endif, etc.

  Group.new('Type'        , C.yellow, C.NONE, S.NONE) -- int, long, char, etc.
  Group.new('StorageClass', G.Statement)  -- static, register, volatile, etc.
  Group.new('Structure'   , G.Statement)  -- struct, union, enum, etc.
  Group.new('Typedef'     , G.Statement)  -- A typedef

  Group.new('Special'       , C.red    , C.NONE  , S.NONE) -- any special symbol
  Group.new('SpecialChar'   , G.Special)  -- special character in a constant
  Group.new('Tag'           , G.Special)  -- you can use CTRL-] on this
  Group.new('Delimiter'     , G.Special)  -- character that needs attention
  Group.new('SpecialComment', G.Special)  -- special things inside a comment
  Group.new('Debug'         , G.Special)  -- debugging statements

  Group.new('Underlined'    , C.violet , C.NONE  , S.NONE)
  Group.new('Ignore'        , C.NONE   , C.NONE  , S.NONE)
  Group.new('Todo'          , C.magenta, C.NONE  , S.bold)
  Group.new('Error'         , C.red    , C.NONE  , S.NONE)
  Group.new('Warning'       , C.yellow)
  Group.new('Information'   , C.blue)
  Group.new('Hint'          , C.cyan)

  -- Additional Groups
  Group.new('StatusLine'  , C.base1 , C.base02, S.reverse)
  Group.new('StatusLineNC', C.base00, C.base02, S.reverse)
  Group.new('Visual'      , C.base01, C.bg    , S.reverse)

  Group.new('SpecialKey'  , C.base00, C.base02, S.bold)
  Group.new('SignColumn'  , C.base0 , C.NONE  , S.NONE)
  Group.new('Conceal'     , C.blue  , C.NONE  , S.NONE)
  Group.new('Cursor'      , C.bg    , C.base0, S.NONE)
  Group.new('TermCursorNC', C.bg    , C.base01)
  Group.link('lCursor'    , G.Cursor)
  Group.link('TermCursor' , G.Cursor)

  Group.new('LineNr'      , C.base01, C.NONE, S.NONE)
  Group.new('CursorLine'  , C.NONE,   C.base02, S.NONE)
  Group.new('CursorLineNr', C.base2, C.NONE, S.NONE)

  Group.new('IncSearch'   , C.orange , C.NONE  , S.standout)
  Group.new('Search'      , C.yellow , C.NONE  , S.reverse)

  Group.new('DiffAdd'     , C.green  , C.NONE, S.NONE)
  Group.new('DiffChange'  , C.yellow , C.NONE, S.NONE)
  Group.new('DiffDelete'  , C.red    , C.NONE, S.NONE)
  Group.new('DiffText'    , C.blue   , C.NONE, S.NONE)
  Group.link('diffAdded'  , G.DiffAdd)
  Group.link('diffRemoved', G.DiffDelete)
  Group.link('diffLine'   , G.Identifier)

  Group.new('SpellBad'    , C.orange, C.NONE, S.undercurl)
  Group.new('SpellCap'    , C.violet, C.NONE, S.undercurl)
  Group.new('SpellRare'   , C.cyan  , C.NONE, S.undercurl)
  Group.new('SpellLocal'  , C.yellow, C.NONE, S.undercurl)

  Group.new('ErrorMsg'    , G.Error)
  Group.new('MoreMsg'     , C.blue   , C.NONE  , S.NONE)
  Group.new('ModeMsg'     , C.blue   , C.NONE  , S.NONE)
  Group.new('Question'    , C.cyan   , C.NONE  , S.bold)
  Group.new('VertSplit'   , C.base00 , C.NONE  , S.NONE)
  Group.new('Title'       , C.orange , C.NONE  , S.bold)
  Group.new('VisualNOS'   , C.NONE   , C.base02, S.reverse)
  Group.new('WarningMsg'  , C.red    , C.NONE  , S.NONE)
  Group.new('WildMenu'    , C.base2  , C.base02, S.NONE)
  Group.new('Folded'      , C.blue   , C.bg    , S.NONE)
  Group.new('FoldColumn'  , C.blue   , C.bg    , S.NONE)

  Group.new('Directory'   , C.blue   , C.NONE  , S.NONE)

  Group.new('NonText'     , C.base02 , C.NONE  , S.NONE)  -- subtle EOL symbols
  Group.new('Whitespace'  , C.orange , C.NONE  , S.NONE)  -- listchars
  Group.new('QuickFixLine', C.yellow , C.base02, S.NONE)  -- selected quickfix item

  -- pum (popup menu)
  Group.new('Pmenu', G.Normal, C.base02, S.NONE) -- popup menu normal item
  Group.new('PmenuSel', C.base01, C.base2, S.reverse) -- selected item
  Group.new('PmenuSbar', C.base02, C.NONE, S.reverse)
  Group.new('PmenuThumb', C.base0, C.NONE, S.reverse)

  Group.new('TabLine'    , C.base0 , C.base02 , S.NONE)
  Group.new('TabLineFill', C.base0 , C.base02)
  Group.new('TabLineSel' , C.yellow, C.bg)

  Group.new('MatchParen', C.red, C.base01, S.bold)

  -- vim highlighting
  Group.link('vimVar', G.Identifier)
  Group.link('vimFunc', G.Identifier)
  Group.link('vimUserFunc', G.Identifier)
  Group.link('helpSpecial', G.Special)
  Group.link('vimSet', G.Normal)
  Group.link('vimSetEqual', G.Normal)
  Group.new('vimCommentString', C.violet)
  Group.new('vimCommand', C.yellow)
  Group.new('vimCmdSep', C.blue, C.NONE, S.bold)
  Group.new('helpExample', C.base1)
  Group.new('helpOption', C.cyan)
  Group.new('helpNote', C.magenta)
  Group.new('helpVim', C.magenta)
  Group.new('helpHyperTextJump', C.blue, C.NONE, S.underline)
  Group.new('helpHyperTextEntry', C.green)
  Group.new('vimIsCommand', C.base00)
  Group.new('vimSynMtchOpt', C.yellow)
  Group.new('vimSynType', C.cyan)
  Group.new('vimHiLink', C.blue)
  Group.new('vimGroup', C.blue, C.NONE, S.underline + S.bold)

  -- git highlighting
  Group.new('gitcommitSummary'        , C.green)
  Group.link('gitcommitComment'       , G.Comment)
  Group.link('gitcommitUntracked'     , G.gitcommitComment)
  Group.link('gitcommitDiscarded'     , G.gitcommitComment)
  Group.link('gitcommitSelected'      , G.gitcommitComment)
  Group.link('gitcommitOnBranch'      , G.gitcommitComment)

  Group.new('gitcommitBranch'         , C.blue , C.base02, S.NONE)
  Group.link('gitcommitNoBranch'      , G.gitcommitBranch)

  Group.new('gitcommitHeader'         , C.base01)
  Group.new('gitcommitFile'           , C.base0)

  Group.new('gitcommitSelectedType'   , C.green)
  Group.link('gitcommitSelectedFile'  , G.gitcommitSelectedType)
  Group.link('gitcommitSelectedArrow' , G.gitCommitSelectedFile)

  Group.new('gitcommitDiscardedType'  , C.orange)
  Group.link('gitcommitDiscardedFile' , G.gitcommitDiscardedType)
  Group.link('gitcommitDiscardedArrow', G.gitCommitDiscardedFile)

  Group.new('gitcommitUntrackedFile'  , C.cyan)

  Group.new('gitcommitUnmerged'       , C.yellow, C.NONE, S.NONE)
  Group.new('gitcommitUnmergedFile'   , C.red)
  Group.link('gitcommitUnmergedArrow' , G.gitCommitUnmergedFile)

  Group.new('GitGutterAdd', C.green)
  Group.new('GitGutterChange', C.yellow)
  Group.new('GitGutterDelete', C.red)
  Group.new('GitGutterChangeDelete', C.red)

  Group.new('GitSignsAddLn', C.green)
  Group.new('GitSignsAddNr', C.green)
  Group.new('GitSignsChangeLn', C.yellow)
  Group.new('GitSignsChangeNr', C.yellow)
  Group.new('GitSignsDeleteLn', C.red)
  Group.new('GitSignsDeleteNr', C.red)
  Group.link('GitSignsCurrentLineBlame', G.Comment)

  -- Markdown
  Group.new('markdownH1'                  , C.yellow)
  Group.link('markdownH2'                 , G.markdownH1)
  Group.link('markdownH3'                 , G.markdownH1)
  Group.link('markdownH4'                 , G.markdownH1)
  Group.link('markdownH5'                 , G.markdownH1)
  Group.link('markdownH6'                 , G.markdownH1)
  Group.new('markdownHeadingRule'         , C.yellow, C.none, S.bold)
  Group.link('markdownHeadingDelimiter'   , G.markdownHeadingRule)
  Group.link('markdownH1Delimiter'        , G.markdownHeadingDelimiter)
  Group.link('markdownH2Delimiter'        , G.markdownHeadingDelimiter)
  Group.link('markdownH3Delimiter'        , G.markdownHeadingDelimiter)
  Group.link('markdownH4Delimiter'        , G.markdownHeadingDelimiter)
  Group.link('markdownH5Delimiter'        , G.markdownHeadingDelimiter)
  Group.link('markdownH6Delimiter'        , G.markdownHeadingDelimiter)

  Group.new('markdownListMarker'          , C.base2)
  Group.link('markdownOrderedListMarker'  , G.markdownListMarker)
  Group.link('markdownBlockquote'         , G.markdownListMarker)
  Group.link('markdownRule'               , G.Comment)

  Group.new('markdownItalic'              , C.base1, C.none, S.italic)
  Group.new('markdownBold'                , C.base1, C.none, S.bold)
  Group.new('markdownBoldItalic'          , C.base1, C.none, S.bold + S.italic)
  Group.new('markdownCode'                , C.orange)
  Group.link('markdownCodeBlock'          , G.markdownCode)
  Group.link('markdownItalicDelimiter'    , G.Comment)
  Group.link('markdownBoldDelimiter'      , G.Comment)
  Group.link('markdownBoldItalicDelimiter', G.Comment)
  Group.link('markdownCodeDelimiter'      , G.Comment)

  Group.new('markdownFootnote'            , C.cyan)
  Group.link('markdownFootnoteDefinition' , G.markdownFootnote)

  Group.new('markdownLinkText'            , C.blue)
  Group.link('markdownId'                 , G.Comment)
  Group.link('markdownUrl'                , G.Comment)
  Group.new('markdownUrlTitle'            , C.cyan)

  Group.link('markdownLinkTextDelimiter'  , G.Comment)
  Group.link('markdownIdDelimiter'        , G.Comment)
  Group.link('markdownLinkDelimiter'      , G.Comment)
  Group.link('markdownUrlTitleDelimiter'  , G.Comment)
  Group.link('markdownIdDeclaration'      , G.markdownLinkText)

  Group.link('markdownEscape'             , G.Special)
  Group.link('markdownError'              , G.Error)

  -- Plugin: 'ntpeters/vim-better-whitespace'
  Group.new('ExtraWhitespace', C.orange, C.orange) -- trailing whitespace

  -- Plugin: 'lukas-reineke/indent-blankline.nvim'
  Group.new('IndentBlanklineChar', C.base02, C.NONE) -- indentation guides

  -- Plugin: 'lukas-reineke/virt-column.nvim'
  Group.new('VirtColumn' , C.base02, C.NONE, S.NONE)  -- virtual column
  Group.new('ColorColumn', C.NONE  , C.NONE, S.NONE)  -- otherwise this is visible behind VirtColumn

  -- Plugin: 'kyazdani42/nvim-tree.lua'
  Group.new('NvimTreeSpecialFile' , C.base2 , C.NONE, S.NONE)
  Group.new('NvimTreeIndentMarker', C.base01, C.NONE, S.NONE)
  Group.new('NvimTreeGitStaged'   , C.green , C.NONE, S.NONE)
  Group.new('NvimTreeGitRenamed'  , C.yellow, C.NONE, S.NONE)
  Group.new('NvimTreeGitNew'      , C.yellow, C.NONE, S.NONE)
  Group.new('NvimTreeGitDirty'    , C.yellow, C.NONE, S.NONE)
  Group.new('NvimTreeGitDeleted'  , C.orange, C.NONE, S.NONE)
  Group.new('NvimTreeGitMerge'    , C.red   , C.NONE, S.NONE)

  -- Plugin: 'nvim-telescope/telescope.nvim'
  Group.new('TelescopeBorder'        , C.base01, C.NONE, S.NONE)
  Group.new('TelescopePromptBorder'  , C.base1 , C.NONE, S.NONE)
  Group.new('TelescopeTitle'         , C.base1 , C.NONE, S.NONE)
  Group.new('TelescopePromptPrefix'  , C.red   , C.NONE, S.NONE)
  Group.new('TelescopePromptCounter' , C.base1 , C.NONE, S.NONE)
  Group.new('TelescopeMatching'      , C.red   , C.NONE, S.NONE)
  Group.new('TelescopeSelection'     , C.base2 , C.NONE, S.NONE)
  Group.new('TelescopeMultiSelection', C.blue  , C.NONE, S.NONE)
  Group.new('TelescopeMultiIcon'     , C.blue  , C.NONE, S.NONE)
end

return M