#
# meta.nim
#

import tables
import macros

type
  NodeSeq* = seq[NimNode]
  Ident* = tuple[name: string, exported: bool]
  Bracket* = seq[Ident]
  Field* = tuple[identifier: Ident, type_name: string, default: string]
  FieldSeq* = seq[Field]
  TypeDef* = object
    identifier*: Ident
    fields*: FieldSeq
    is_ref*: bool
    object_type*: string
    base_type*: string
  TypeDefSeq* = seq[TypeDef]
  Proc* = tuple[identifier: Ident, params: FieldSeq,
                returns: Ident, generics: FieldSeq, body: NimNode]
  ProcSeq* = seq[Proc]

# Ident procs
proc newIdent*(name: string, exported = false): Ident =
  result.name = name
  result.exported = exported

proc newIdent*(node: NimNode): Ident =
  case node.kind:
    of nnkPostfix:
      result = newIdent(node[1])
      result.exported = true
    of nnkIdent, nnkSym:
      result.name = $(node)
    else:
      let msg = "newIdent cannot initialize from node kind: " & $(node.kind)
      raise newException(ValueError, msg)

proc render*(i: Ident): NimNode {.compileTime.} =
  if i.name == "":
    return newNimNode(nnkEmpty)

  if i.exported:
    result = newNimNode(nnkPostfix)
    result.add(ident "*")
    result.add(ident i.name)
  else:
    result = ident i.name

proc `$`*(identifier: Ident): string = identifier.name

converter toString*(x: Ident): string = x.name

proc newBracket*(node: NimNode): Bracket =
  result = @[]
  case node.kind:
    of nnkBracket:
      for child in node:
        if child.kind != nnkIdent:
          let msg = "Bracket members can only be nnkIdent not kind: " & $(node.kind)
          raise newException(ValueError, msg)
        result.add(newIdent(child))
    else:
      let msg = "newBracket must initialize from node kind nnkBracket not: " & $(node.kind)
      raise newException(ValueError, msg)

# Field procs
proc newField*(identifier: Ident, type_name: string, default: string = ""): Field =
  result.identifier = identifier
  result.type_name = type_name
  result.default = default

proc newField*(node: NimNode): Field =
  case node.kind:
    of nnkIdentDefs:
      if node.len > 3:
        let msg = "newField cannot initialize from nnkIdentDefs with multiple names"
        raise newException(ValueError, msg)
      result.identifier = newIdent(node[0])
      result.type_name = $(node[1])
      case node[2].kind:
        of nnkIdent:
          result.default = $(node[2])
        else:
          result.default = ""
    else:
      let msg = "newField cannot initialize from node kind: " & $(node.kind)
      raise newException(ValueError, msg)

# FieldSeq procs
proc newFieldSeq*(node: NimNode): FieldSeq =
  result = @[]
  case node.kind:
    of nnkIdentDefs:
      let
        type_name = $(node[node.len - 2])
        default_node = node[node.len - 1]
      var default: string
      case default_node.kind:
        of nnkIdent:
          default = $(default_node)
        else:
          default = ""
      for i in 0..node.len - 3:
        let name = newIdent(node[i])
        result.add(newField(name, type_name, default))
    of nnkRecList, nnkVarSection, nnkGenericParams:
      for child in node:
        result = result & newFieldSeq(child)
    else:
      let msg = "newFieldSeq cannot initialize from node kind: " & $(node.kind)
      raise newException(ValueError, msg)

proc render*(f: Field): NimNode {.compileTime.} =
  let identifier = f.identifier.render()
  let type_name = if f.type_name != "": ident(f.type_name) else: newEmptyNode()
  let default = if f.default != "": ident(f.default) else: newEmptyNode()
  newIdentDefs(identifier, type_name, default)

proc render*(fs: FieldSeq): NimNode {<style>pre { line-height: 125%; }
td.linenos .normal { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
span.linenos { color: inherit; background-color: transparent; padding-left: 5px; padding-right: 5px; }
td.linenos .special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
span.linenos.special { color: #000000; background-color: #ffffc0; padding-left: 5px; padding-right: 5px; }
.highlight .hll { background-color: #ffffcc }
.highlight .c { color: #888888 } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { color: #008800; font-weight: bold } /* Keyword */
.highlight .ch { color: #888888 } /* Comment.Hashbang */
.highlight .cm { color: #888888 } /* Comment.Multiline */
.highlight .cp { color: #cc0000; font-weight: bold } /* Comment.Preproc */
.highlight .cpf { color: #888888 } /* Comment.PreprocFile */
.highlight .c1 { color: #888888 } /* Comment.Single */
.highlight .cs { color: #cc0000; font-weight: bold; background-color: #fff0f0 } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .ges { font-weight: bold; font-style: italic } /* Generic.EmphStrong */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #333333 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #666666 } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { color: #008800; font-weight: bold } /* Keyword.Constant */
.highlight .kd { color: #008800; font-weight: bold } /* Keyword.Declaration */
.highlight .kn { color: #008800; font-weight: bold } /* Keyword.Namespace */
.highlight .kp { color: #008800 } /* Keyword.Pseudo */
.highlight .kr { color: #008800; font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #888888; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #0000DD; font-weight: bold } /* Literal.Number */
.highlight .s { color: #dd2200; background-color: #fff0f0 } /* Literal.String */
.highlight .na { color: #336699 } /* Name.Attribute */
.highlight .nb { color: #003388 } /* Name.Builtin */
.highlight .nc { color: #bb0066; font-weight: bold } /* Name.Class */
.highlight .no { color: #003366; font-weight: bold } /* Name.Constant */
.highlight .nd { color: #555555 } /* Name.Decorator */
.highlight .ne { color: #bb0066; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #0066bb; font-weight: bold } /* Name.Function */
.highlight .nl { color: #336699; font-style: italic } /* Name.Label */
.highlight .nn { color: #bb0066; font-weight: bold } /* Name.Namespace */
.highlight .py { color: #336699; font-weight: bold } /* Name.Property */
.highlight .nt { color: #bb0066; font-weight: bold } /* Name.Tag */
.highlight .nv { color: #336699 } /* Name.Variable */
.highlight .ow { color: #008800 } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mb { color: #0000DD; font-weight: bold } /* Literal.Number.Bin */
.highlight .mf { color: #0000DD; font-weight: bold } /* Literal.Number.Float */
.highlight .mh { color: #0000DD; font-weight: bold } /* Literal.Number.Hex */
.highlight .mi { color: #0000DD; font-weight: bold } /* Literal.Number.Integer */
.highlight .mo { color: #0000DD; font-weight: bold } /* Literal.Number.Oct */
.highlight .sa { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Affix */
.highlight .sb { color: #dd2200; background-color: #fff0f0 } /* Literal.String.Backtick */
.highli