local api = vim.api
local ts = vim.treesitter

local parsers = require "nvim-treesitter.parsers"
local configs = require "nvim-treesitter.configs"

local M = {}

local hlmap = vim.treesitter.highlighter.hl_map

-- nvim-treesitter Highlight Group Mappings
-- Note: Some highlight groups may not be applied upstream, some may be experimental

hlmap["annotation"] = "TSAnnotation"

hlmap["attribute"] = "TSAttribute"

hlmap["boolean"] = "TSBoolean"

hlmap["character"] = "TSCharacter"
hlmap["character.special"] = "TSCharacterSpecial"

hlmap["comment"] = "TSComment"

hlmap["conditional"] = "TSConditional"

hlmap["constant"] = "TSConstant"
hlmap["constant.builtin"] = "TSConstBuiltin"
hlmap["constant.macro"] = "TSConstMacro"

hlmap["constructor"] = "TSConstructor"

hlmap["debug"] = "TSDebug"
hlmap["define"] = "TSDefine"

hlmap["error"] = "TSError"
hlmap["exception"] = "TSException"

hlmap["field"] = "TSField"

hlmap["float"] = "TSFloat"

hlmap["function"] = "TSFunction"
hlmap["function.call"] = "TSFunctionCall"
hlmap["function.builtin"] = "TSFuncBuiltin"
hlmap["function.macro"] = "TSFuncMacro"

hlmap["include"] = "TSInclude"

hlmap["keyword"] = "TSKeyword"
hlmap["keyword.function"] = "TSKeywordFunction"
hlmap["keyword.operator"] = "TSKeywordOperator"
hlmap["keyword.return"] = "TSKeywordReturn"

hlmap["label"] = "TSLabel"

hlmap["method"] = "TSMethod"
hlmap["method.call"] = "TSMethodCall"

hlmap["namespace"] = "TSNamespace"

hlmap["none"] = "TSNone"
hlmap["number"] = "TSNumber"

hlmap["operator"] = "TSOperator"

hlmap["parameter"] = "TSParameter"
hlmap["parameter.reference"] = "TSParameterReference"

hlmap["preproc"] = "TSPreProc"

hlmap["property"] = "TSProperty"

hlmap["punctuation.delimiter"] = "TSPunctDelimiter"
hlmap["punctuation.bracket"] = "TSPunctBracket"
hlmap["punctuation.special"] = "TSPunctSpecial"

hlmap["repeat"] = "TSRepeat"

hlmap["storageclass"] = "TSStorageClass"

hlmap["string"] = "TSString"
hlmap["string.regex"] = "TSStringRegex"
hlmap["string.escape"] = "TSStringEscape"
hlmap["string.special"] = "TSStringSpecial"

hlmap["symbol"] = "TSSymbol"

hlmap["tag"] = "TSTag"
hlmap["tag.attribute"] = "TSTagAttribute"
hlmap["tag.delimiter"] = "TSTagDelimiter"

hlmap["text"] = "TSText"
hlmap["text.strong"] = "TSStrong"
hlmap["text.emphasis"] = "TSEmphasis"
hlmap["text.underline"] = "TSUnderline"
hlmap["text.strike"] = "TSStrike"
hlmap["text.title"] = "TSTitle"
hlmap["text.literal"] = "TSLiteral"
hlmap["text.uri"] = "TSURI"
hlmap["text.math"] = "TSMath"
hlmap["text.reference"] = "TSTextReference"
hlmap["text.environment"] = "TSEnvironment"
hlmap["text.environment.name"] = "TSEnvironmentName"

hlmap["text.note"] = "TSNote"
hlmap["text.warning"] = "TSWarning"
hlmap["text.danger"] = "TSDanger"

hlmap["todo"] = "TSTodo"

hlmap["type"] = "TSType"
hlmap["type.builtin"] = "TSTypeBuiltin"
hlmap["type.qualifier"] = "TSTypeQualifier"
hlmap["type.definition"] = "TSTypeDefinition"

hlmap["variable"] = "TSVariable"
hlmap["variable.builtin"] = "TSVariableBuiltin"

local function should_enable_vim_regex(config, lang)
  local additional_hl = config.additional_vim_regex_highlighting
  local is_table = type(additional_hl) == "table"

  return additional_hl and (not is_table or vim.tbl_contains(additional_hl, lang))
end

local function enable_syntax(bufnr)
  api.nvim_buf_set_option(bufnr, "syntax", "ON")
end

function M.stop(bufnr)
  if ts.highlighter.active[bufnr] then
    ts.highlighter.active[bufnr]:destroy()
  end
end

function M.start(bufnr, lang)
  local parser = parsers.get_parser(bufnr, lang)
  ts.highlighter.new(parser, {})
end

function M.attach(bufnr, lang)
  local config = configs.get_module "highlight"
  M.start(bufnr, lang)
  if should_enable_vim_regex(config, lang) then
    enable_syntax(bufnr)
  end
end

function M.detach(bufnr)
  M.stop(bufnr)
  enable_syntax(bufnr)
end

function M.set_custom_captures(captures)
  for k, v in pairs(captures) do
    hlmap[k] = v
  end
end

function M.set_default_hlgroups()
  local highlights = {
    TSNone = { default = true },
    TSPunctDelimiter = { link = "Delimiter", default = true },
    TSPunctBracket = { link = "Delimiter", default = true },
    TSPunctSpecial = { link = "Delimiter", default = true },

    TSConstant = { link = "Constant", default = true },
    TSConstBuiltin = { link = "Special", default = true },
    TSConstMacro = { link = "Define", default = true },
    TSString = { link = "String", default = true },
    TSStringRegex = { link = "String", default = true },
    TSStringEscape = { link = "SpecialChar", default = true },
    TSStringSpecial = { link = "SpecialChar", default = true },
    TSCharacter = { link = "Character", default = true },
    TSCharacterSpecial = { link = "SpecialChar", default = true },
    TSNumber = { link = "Number", default = true },
    TSBoolean = { link = "Boolean", default = true },
    TSFloat = { link = "Float", default = true },

    TSFunction = { link = "Function", default = true },
    TSFunctionCall = { link = "TSFunction", default = true },
    TSFuncBuiltin = { link = "Special", default = true },
    TSFuncMacro = { link = "Macro", default = true },
    TSParameter = { link = "Identifier", default = true },
    TSParameterReference = { link = "TSParameter", default = true },
    TSMethod = { link = "Function", default = true },
    TSMethodCall = { link = "TSMethod", default = true },
    TSField = { link = "Identifier", default = true },
    TSProperty = { link = "Identifier", default = true },
    TSConstructor = { link = "Special", default = true },
    TSAnnotation = { link = "PreProc", default = true },
    TSAttribute = { link = "PreProc", default = true },
    TSNamespace = { link = "Include", default = true },
    TSSymbol = { link = "Identifier", default = true },

    TSConditional = { link = "Conditional", default = true },
    TSRepeat = { link = "Repeat", default = true },
    TSLabel = { link = "Label", default = true },
    TSOperator = { link = "Operator", default = true },
    TSKeyword = { link = "Keyword", default = true },
    TSKeywordFunction = { link = "Keyword", default = true },
    TSKeywordOperator = { link = "TSOperator", default = true },
    TSKeywordReturn = { link = "TSKeyword", default = true },
    TSException = { link = "Exception", default = true },
    TSDebug = { link = "Debug", default = true },
    TSDefine = { link = "Define", default = true },
    TSPreProc = { link = "PreProc", default = true },
    TSStorageClass = { link = "StorageClass", default = true },

    TSTodo = { link = "Todo", default = true },

    TSType = { link = "Type", default = true },
    TSTypeBuiltin = { link = "Type", default = true },
    TSTypeQualifier = { link = "Type", default = true },
    TSTypeDefinition = { link = "Typedef", default = true },

    TSInclude = { link = "Include", default = true },

    TSVariableBuiltin = { link = "Special", default = true },

    TSText = { link = "TSNone", default = true },
    TSStrong = { bold = true, default = true },
    TSEmphasis = { italic = true, default = true },
    TSUnderline = { underline = true },
    TSStrike = { strikethrough = true },

    TSMath = { link = "Special", default = true },
    TSTextReference = { link = "Constant", default = true },
    TSEnvironment = { link = "Macro", default = true },
    TSEnvironmentName = { link = "Type", default = true },
    TSTitle = { link = "Title", default = true },
    TSLiteral = { link = "String", default = true },
    TSURI = { link = "Underlined", default = true },

    TSComment = { link = "Comment", default = true },
    TSNote = { link = "SpecialComment", default = true },
    TSWarning = { link = "Todo", default = true },
    TSDanger = { link = "WarningMsg", default = true },

    TSTag = { link = "Label", default = true },
    TSTagDelimiter = { link = "Delimiter", default = true },
    TSTagAttribute = { link = "TSProperty", default = true },
  }

  for k, v in pairs(highlights) do
    api.nvim_set_hl(0, k, v)
  end
end

return M