-- Plan9 colorscheme for Neovim
-- Plan 9 / Acme cream background with syntax highlighting
-- Inspired by john2x/plan9-theme.el for Emacs
-- Light theme with muted, earthy colors on #FFFFEA cream

local M = {}

local colors = {
  -- Base
  bg = "#ffffea",
  bg_dim = "#efeed8",
  bg_dark = "#e8e8c8",
  bg_highlight = "#e8eb98",
  fg = "#424242",
  fg_dim = "#888888",
  fg_faint = "#b8b09a",

  -- Acme tag bar
  tagbar = "#aeeeee",
  tagbar_inactive = "#eaffff",

  -- Syntax
  comment = "#998f6a",
  string = "#b85c57",
  keyword = "#2a5db0",
  func = "#4a7582",
  type = "#1a7f53",
  const = "#7a4f30",
  preproc = "#5f7f8f",
  special = "#6f5f90",
  operator = "#555555",

  -- Status
  error = "#b85c57",
  warn = "#8f7634",
  info = "#57864e",
  hint = "#2a8dc5",

  -- Git
  git_add = "#57864e",
  git_change = "#8f7634",
  git_delete = "#b85c57",

  -- Diff
  diff_add = "#d5ebd0",
  diff_delete = "#ebd0d0",
  diff_change = "#ebe8d0",
  diff_text = "#d8d5b0",

  -- UI
  selection = "#e8eb98",
  cursor_line = "#f5f5d0",
  border = "#c8c8a8",
  line_nr = "#b0a888",
}

function M.setup()
  vim.cmd("hi clear")
  if vim.fn.exists("syntax_on") then
    vim.cmd("syntax reset")
  end

  vim.o.background = "light"
  vim.g.colors_name = "plan9"

  local hi = function(group, opts)
    vim.api.nvim_set_hl(0, group, opts)
  end

  -- Editor
  hi("Normal", { fg = colors.fg, bg = colors.bg })
  hi("NormalFloat", { fg = colors.fg, bg = colors.bg_dim })
  hi("FloatBorder", { fg = colors.border, bg = colors.bg_dim })
  hi("Cursor", { fg = colors.bg, bg = colors.fg })
  hi("CursorLine", { bg = colors.cursor_line })
  hi("CursorLineNr", { fg = colors.fg, bg = colors.cursor_line, bold = true })
  hi("CursorColumn", { bg = colors.cursor_line })
  hi("LineNr", { fg = colors.line_nr })
  hi("SignColumn", { bg = colors.bg })
  hi("ColorColumn", { bg = colors.bg_dim })
  hi("VertSplit", { fg = colors.border, bg = colors.bg })
  hi("WinSeparator", { fg = colors.border, bg = colors.bg })
  hi("Folded", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("FoldColumn", { fg = colors.line_nr, bg = colors.bg })
  hi("NonText", { fg = colors.border })
  hi("SpecialKey", { fg = colors.border })
  hi("EndOfBuffer", { fg = colors.bg_dim })
  hi("MatchParen", { fg = colors.fg, bg = colors.bg_highlight, bold = true })
  hi("Directory", { fg = colors.func, bold = true })
  hi("Title", { fg = colors.keyword, bold = true })
  hi("Conceal", { fg = colors.fg_dim })

  -- Selection
  hi("Visual", { bg = colors.selection })
  hi("VisualNOS", { bg = colors.selection })

  -- Search
  hi("Search", { fg = colors.fg, bg = colors.bg_highlight, bold = true })
  hi("IncSearch", { fg = colors.bg, bg = colors.keyword, bold = true })
  hi("CurSearch", { fg = colors.bg, bg = colors.keyword, bold = true })

  -- Spell
  hi("SpellBad", { undercurl = true, sp = colors.error })
  hi("SpellCap", { undercurl = true, sp = colors.info })
  hi("SpellRare", { undercurl = true, sp = colors.hint })
  hi("SpellLocal", { undercurl = true, sp = colors.warn })

  -- Statusline
  hi("StatusLine", { fg = colors.fg, bg = colors.tagbar, bold = true })
  hi("StatusLineNC", { fg = colors.fg_dim, bg = colors.tagbar_inactive })
  hi("TabLine", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("TabLineFill", { bg = colors.bg_dim })
  hi("TabLineSel", { fg = colors.fg, bg = colors.bg, bold = true })
  hi("WinBar", { fg = colors.fg, bg = colors.bg })
  hi("WinBarNC", { fg = colors.fg_dim, bg = colors.bg_dim })

  -- Popup menu
  hi("Pmenu", { fg = colors.fg, bg = colors.bg_dim })
  hi("PmenuSel", { fg = colors.fg, bg = colors.selection, bold = true })
  hi("PmenuSbar", { bg = colors.bg_dark })
  hi("PmenuThumb", { bg = colors.border })

  -- Messages
  hi("ErrorMsg", { fg = colors.error, bold = true })
  hi("WarningMsg", { fg = colors.warn, bold = true })
  hi("ModeMsg", { fg = colors.fg, bold = true })
  hi("MoreMsg", { fg = colors.info, bold = true })
  hi("Question", { fg = colors.info })

  -- Diagnostics
  hi("DiagnosticError", { fg = colors.error })
  hi("DiagnosticWarn", { fg = colors.warn })
  hi("DiagnosticInfo", { fg = colors.info })
  hi("DiagnosticHint", { fg = colors.hint })
  hi("DiagnosticUnderlineError", { undercurl = true, sp = colors.error })
  hi("DiagnosticUnderlineWarn", { undercurl = true, sp = colors.warn })
  hi("DiagnosticUnderlineInfo", { undercurl = true, sp = colors.info })
  hi("DiagnosticUnderlineHint", { undercurl = true, sp = colors.hint })

  -- Diff
  hi("DiffAdd", { bg = colors.diff_add })
  hi("DiffDelete", { bg = colors.diff_delete })
  hi("DiffChange", { bg = colors.diff_change })
  hi("DiffText", { bg = colors.diff_text })

  -- Syntax (colored — Plan 9 inspired palette)
  hi("Comment", { fg = colors.comment, italic = true })
  hi("Constant", { fg = colors.const })
  hi("String", { fg = colors.string })
  hi("Character", { fg = colors.string })
  hi("Number", { fg = colors.const })
  hi("Boolean", { fg = colors.const })
  hi("Float", { fg = colors.const })
  hi("Identifier", { fg = colors.fg })
  hi("Function", { fg = colors.func })
  hi("Statement", { fg = colors.keyword })
  hi("Conditional", { fg = colors.keyword })
  hi("Repeat", { fg = colors.keyword })
  hi("Label", { fg = colors.keyword })
  hi("Operator", { fg = colors.operator })
  hi("Keyword", { fg = colors.keyword, italic = true })
  hi("Exception", { fg = colors.error })
  hi("PreProc", { fg = colors.preproc })
  hi("Include", { fg = colors.preproc })
  hi("Define", { fg = colors.preproc })
  hi("Macro", { fg = colors.preproc })
  hi("PreCondit", { fg = colors.preproc })
  hi("Type", { fg = colors.type })
  hi("StorageClass", { fg = colors.type })
  hi("Structure", { fg = colors.type })
  hi("Typedef", { fg = colors.type })
  hi("Special", { fg = colors.special })
  hi("SpecialChar", { fg = colors.special })
  hi("Tag", { fg = colors.func })
  hi("Delimiter", { fg = colors.operator })
  hi("SpecialComment", { fg = colors.comment, bold = true })
  hi("Debug", { fg = colors.error })
  hi("Underlined", { fg = colors.hint, underline = true })
  hi("Ignore", { fg = colors.fg_faint })
  hi("Error", { fg = colors.error, bold = true })
  hi("Todo", { fg = colors.bg, bg = colors.warn, bold = true })

  -- Treesitter
  hi("@variable", { fg = colors.fg })
  hi("@variable.builtin", { fg = colors.special })
  hi("@variable.parameter", { fg = colors.fg })
  hi("@variable.member", { fg = colors.fg })
  hi("@constant", { fg = colors.const })
  hi("@constant.builtin", { fg = colors.const })
  hi("@module", { fg = colors.type })
  hi("@label", { fg = colors.keyword })
  hi("@string", { fg = colors.string })
  hi("@string.documentation", { fg = colors.comment })
  hi("@string.escape", { fg = colors.special })
  hi("@string.special", { fg = colors.special })
  hi("@character", { fg = colors.string })
  hi("@number", { fg = colors.const })
  hi("@boolean", { fg = colors.const })
  hi("@float", { fg = colors.const })
  hi("@function", { fg = colors.func })
  hi("@function.builtin", { fg = colors.func })
  hi("@function.call", { fg = colors.func })
  hi("@function.macro", { fg = colors.preproc })
  hi("@method", { fg = colors.func })
  hi("@method.call", { fg = colors.func })
  hi("@constructor", { fg = colors.type })
  hi("@parameter", { fg = colors.fg })
  hi("@keyword", { fg = colors.keyword, italic = true })
  hi("@keyword.function", { fg = colors.keyword, italic = true })
  hi("@keyword.operator", { fg = colors.keyword })
  hi("@keyword.return", { fg = colors.keyword, italic = true })
  hi("@conditional", { fg = colors.keyword })
  hi("@repeat", { fg = colors.keyword })
  hi("@exception", { fg = colors.error })
  hi("@include", { fg = colors.preproc })
  hi("@type", { fg = colors.type })
  hi("@type.builtin", { fg = colors.type })
  hi("@type.qualifier", { fg = colors.keyword })
  hi("@type.definition", { fg = colors.type })
  hi("@storageclass", { fg = colors.keyword })
  hi("@attribute", { fg = colors.preproc })
  hi("@field", { fg = colors.fg })
  hi("@property", { fg = colors.fg })
  hi("@punctuation.bracket", { fg = colors.operator })
  hi("@punctuation.delimiter", { fg = colors.operator })
  hi("@punctuation.special", { fg = colors.special })
  hi("@comment", { fg = colors.comment, italic = true })
  hi("@tag", { fg = colors.func })
  hi("@tag.attribute", { fg = colors.type })
  hi("@tag.delimiter", { fg = colors.operator })
  hi("@text", { fg = colors.fg })
  hi("@text.strong", { fg = colors.fg, bold = true })
  hi("@text.emphasis", { fg = colors.fg, italic = true })
  hi("@text.underline", { fg = colors.fg, underline = true })
  hi("@text.strike", { fg = colors.fg, strikethrough = true })
  hi("@text.title", { fg = colors.keyword, bold = true })
  hi("@text.literal", { fg = colors.string })
  hi("@text.uri", { fg = colors.hint, underline = true })
  hi("@text.todo", { fg = colors.bg, bg = colors.warn, bold = true })
  hi("@text.note", { fg = colors.bg, bg = colors.info, bold = true })
  hi("@text.warning", { fg = colors.bg, bg = colors.warn, bold = true })
  hi("@text.danger", { fg = colors.bg, bg = colors.error, bold = true })

  -- LSP
  hi("LspReferenceText", { bg = colors.selection })
  hi("LspReferenceRead", { bg = colors.selection })
  hi("LspReferenceWrite", { bg = colors.selection })
  hi("LspSignatureActiveParameter", { fg = colors.keyword, bold = true })

  -- Git signs
  hi("GitSignsAdd", { fg = colors.git_add })
  hi("GitSignsChange", { fg = colors.git_change })
  hi("GitSignsDelete", { fg = colors.git_delete })
  hi("GitSignsCurrentLineBlame", { fg = colors.fg_faint, italic = true })

  -- Telescope
  hi("TelescopeBorder", { fg = colors.border })
  hi("TelescopePromptBorder", { fg = colors.border })
  hi("TelescopeResultsBorder", { fg = colors.border })
  hi("TelescopePreviewBorder", { fg = colors.border })
  hi("TelescopeSelection", { bg = colors.selection })
  hi("TelescopeSelectionCaret", { fg = colors.keyword, bg = colors.selection })
  hi("TelescopeMatching", { fg = colors.string, bold = true })

  -- NeoTree
  hi("NeoTreeNormal", { fg = colors.fg, bg = colors.bg_dim })
  hi("NeoTreeNormalNC", { fg = colors.fg, bg = colors.bg_dim })
  hi("NeoTreeDirectoryName", { fg = colors.func, bold = true })
  hi("NeoTreeDirectoryIcon", { fg = colors.func })
  hi("NeoTreeRootName", { fg = colors.keyword, bold = true })
  hi("NeoTreeFileName", { fg = colors.fg })
  hi("NeoTreeGitAdded", { fg = colors.git_add })
  hi("NeoTreeGitModified", { fg = colors.git_change })
  hi("NeoTreeGitDeleted", { fg = colors.git_delete })

  -- Which-key
  hi("WhichKey", { fg = colors.func })
  hi("WhichKeyGroup", { fg = colors.keyword })
  hi("WhichKeyDesc", { fg = colors.fg })
  hi("WhichKeySeparator", { fg = colors.fg_faint })
  hi("WhichKeyFloat", { bg = colors.bg_dim })

  -- Indent blankline
  hi("IndentBlanklineChar", { fg = colors.bg_dark })
  hi("IndentBlanklineContextChar", { fg = colors.border })
  hi("IblIndent", { fg = colors.bg_dark })
  hi("IblScope", { fg = colors.border })

  -- Notify
  hi("NotifyERRORBorder", { fg = colors.error })
  hi("NotifyWARNBorder", { fg = colors.warn })
  hi("NotifyINFOBorder", { fg = colors.info })
  hi("NotifyDEBUGBorder", { fg = colors.fg_faint })
  hi("NotifyTRACEBorder", { fg = colors.hint })
  hi("NotifyERRORIcon", { fg = colors.error })
  hi("NotifyWARNIcon", { fg = colors.warn })
  hi("NotifyINFOIcon", { fg = colors.info })
  hi("NotifyDEBUGIcon", { fg = colors.fg_faint })
  hi("NotifyTRACEIcon", { fg = colors.hint })
  hi("NotifyERRORTitle", { fg = colors.error })
  hi("NotifyWARNTitle", { fg = colors.warn })
  hi("NotifyINFOTitle", { fg = colors.info })
  hi("NotifyDEBUGTitle", { fg = colors.fg_faint })
  hi("NotifyTRACETitle", { fg = colors.hint })

  -- Dashboard
  hi("DashboardHeader", { fg = colors.func })
  hi("DashboardCenter", { fg = colors.fg })
  hi("DashboardFooter", { fg = colors.fg_faint })
  hi("DashboardShortCut", { fg = colors.keyword })

  -- Lazy
  hi("LazyButton", { fg = colors.fg, bg = colors.bg_dim })
  hi("LazyButtonActive", { fg = colors.fg, bg = colors.selection, bold = true })
  hi("LazyH1", { fg = colors.keyword, bold = true })
  hi("LazySpecial", { fg = colors.func })

  -- Mini
  hi("MiniStatuslineModeNormal", { fg = colors.bg, bg = colors.func, bold = true })
  hi("MiniStatuslineModeInsert", { fg = colors.bg, bg = colors.type, bold = true })
  hi("MiniStatuslineModeVisual", { fg = colors.bg, bg = colors.keyword, bold = true })
  hi("MiniStatuslineModeReplace", { fg = colors.bg, bg = colors.error, bold = true })
  hi("MiniStatuslineModeCommand", { fg = colors.bg, bg = colors.const, bold = true })

  -- Bufferline
  hi("BufferLineFill", { bg = colors.bg_dim })
  hi("BufferLineBackground", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("BufferLineBuffer", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("BufferLineBufferSelected", { fg = colors.fg, bg = colors.bg, bold = true })
  hi("BufferLineBufferVisible", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("BufferLineCloseButton", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("BufferLineCloseButtonSelected", { fg = colors.error, bg = colors.bg })
  hi("BufferLineCloseButtonVisible", { fg = colors.fg_dim, bg = colors.bg_dim })
  hi("BufferLineIndicatorSelected", { fg = colors.func, bg = colors.bg })
  hi("BufferLineModified", { fg = colors.warn, bg = colors.bg_dim })
  hi("BufferLineModifiedSelected", { fg = colors.warn, bg = colors.bg })
  hi("BufferLineSeparator", { fg = colors.bg_dim, bg = colors.bg_dim })
  hi("BufferLineSeparatorSelected", { fg = colors.bg_dim, bg = colors.bg })

  -- Copilot
  hi("CopilotSuggestion", { fg = colors.fg_faint })
end

M.setup()

return M