-- Paper Tonic Modern - Editor Highlight Groups
-- Base Vim/Neovim UI elements

local c = require('paper-tonic-modern.colors')

return {
  -- ============================================================================
  -- Core Editor Elements
  -- ============================================================================
  
  Normal = { fg = c.fg, bg = c.bg },
  NormalFloat = { fg = c.fg, bg = c.NONE },
  FloatBorder = { fg = c.fg_stronger, bg = c.NONE },
  
  -- ============================================================================
  -- Cursor & Line Highlighting
  -- ============================================================================
  
  Cursor = { reverse = true },
  CursorIM = 'Cursor',
  CursorLine = { bg = c.bg_hl },
  CursorLineNr = { fg = c.fg_weak, bold = true },
  CursorColumn = { bg = c.bg_hl },
  
  -- ============================================================================
  -- Line Numbers & Columns
  -- ============================================================================
  
  LineNr = { fg = c.fg_weak },
  SignColumn = { fg = c.NONE, bg = c.NONE },
  ColorColumn = { bg = c.bg_hl_weak },
  
  -- ============================================================================
  -- Visual Selection & Search
  -- ============================================================================
  
  Visual = { bg = c.bg_hl_special },
  VisualNOS = { fg = c.fg_strong, bg = c.bg_hl_special, bold = true },
  
  Search = { bg = c.bg_hl_special },
  IncSearch = { reverse = true },
  MatchParen = { bg = c.bg_hl_special_alt_strong, bold = true, underline = true, sp = c.fg_stronger },
  
  -- ============================================================================
  -- Status Line & Tab Line
  -- ============================================================================
  
  StatusLine = { fg = c.fg, bg = c.bg_ui, italic = true },
  StatusLineNC = { fg = c.fg_weaker, bg = c.bg_ui, italic = true },
  StatusLineTerm = 'StatusLine',
  StatusLineTermNC = 'StatusLineNC',
  
  TabLine = 'StatusLineNC',
  TabLineFill = { fg = c.bg_ui, bg = c.bg_ui },
  TabLineSel = 'StatusLine',
  
  -- ============================================================================
  -- Window Separators & Misc UI
  -- ============================================================================
  
  VertSplit = { fg = c.bg_hl_strong },
  Title = { bold = true },
  Directory = { fg = c.primary_weak, bold = true },
  
  -- ============================================================================
  -- Popup Menu (Completion)
  -- ============================================================================
  
  Pmenu = { fg = c.fg, bg = c.bg_ui },
  PmenuSel = { fg = c.fg_strong, bg = c.bg_ui, bold = true },
  PmenuSbar = 'Pmenu',
  PmenuThumb = 'Pmenu',
  WildMenu = { fg = c.fg_strong, bg = c.bg_ui, bold = true },
  
  -- ============================================================================
  -- Folds
  -- ============================================================================
  
  Folded = { fg = c.fg_strong, bold = true },
  FoldColumn = { fg = c.fg_weak },
  
  -- ============================================================================
  -- Diffs
  -- ============================================================================
  
  DiffAdd = { bg = c.bg_success },
  DiffChange = { bg = c.bg_modified },
  DiffDelete = { bg = c.bg_fail },
  DiffText = { fg = c.fg_stronger, bg = c.bg_success },
  
  -- ============================================================================
  -- Spelling
  -- ============================================================================
  
  SpellBad = { fg = c.alert_strong, bg = c.bg_error_weak },
  SpellCap = { fg = c.alert, bg = c.bg_error_weak },
  SpellLocal = { fg = c.alert_weak, bg = c.bg_error_weak },
  SpellRare = { fg = c.alert_weak, bg = c.bg_error_weak },
  
  -- ============================================================================
  -- Messages & Prompts
  -- ============================================================================
  
  ErrorMsg = { fg = c.alert, bold = true },
  WarningMsg = { fg = c.alert, bold = true },
  Question = { fg = c.question, bold = true },
  ModeMsg = { fg = c.question },
  MoreMsg = { fg = c.question },
  
  -- ============================================================================
  -- Special Characters & Whitespace
  -- ============================================================================
  
  NonText = { fg = c.fg_weak },
  EndOfBuffer = 'Comment',
  Whitespace = 'NonText',
  SpecialKey = 'SpecialChar',
  Conceal = 'Noise',
  
  -- ============================================================================
  -- QuickFix & Location List
  -- ============================================================================
  
  QuickFixLine = { bg = c.bg_hl_special_weak, bold = true },
  
  -- Diagnostic severity highlighting in quickfix/location list
  -- These are custom syntax groups defined in autocmds.lua (using matchadd)
  -- Uses muted colors (similar tone to git/diff) - not the fluorescent editor diagnostic colors
  qfError = { fg = c.qf_error, bold = true },      -- "error" word (muted red)
  qfWarning = { fg = c.qf_warn, bold = true },     -- "warning" word (muted orange)
  qfInfo = { fg = c.qf_info, bold = true },        -- "info" word (muted blue)
  qfHint = { fg = c.qf_hint, bold = true },        -- "hint" word (lighter muted blue)
  qfNote = { fg = c.qf_hint, bold = true },        -- "note" word (same as hint)
  
  -- ============================================================================
  -- Debug
  -- ============================================================================
  
  debugPC = 'ColorColumn',
  debugBreakpoint = 'ErrorMsg',
}