import 
  strutils, 
  sequtils,
  json
import 
  ../core/parser, 
  ../core/value, 
  ../core/interpreter, 
  ../core/utils,
  ../packages/nim-sgregex/sgregex


proc str_module*(i: In) = 
  let def = i.define()

  def.symbol("interpolate") do (i: In):
    let vals = i.expect("quot", "string")
    var q = vals[0]
    let s = vals[1]
    var strings = newSeq[string](0)
    for el in q.qVal:
      strings.add $$el
    let res = s.strVal % strings
    i.push res.newVal

  def.symbol("apply-interpolate") do (i: In):
    i.push "apply".newSym
    i.push "interpolate".newSym

  def.symbol("strip") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.strip.newVal
    
  def.symbol("substr") do (i: In):
    let vals = i.expect("int", "int", "'sym")
    let length = vals[0].intVal
    let start = vals[1].intVal
    let s = vals[2].getString
    let index = min(start+length-1, s.len-1) 
    i.push s[start..index].newVal

  def.symbol("split") do (i: In):
    let vals = i.expect("'sym", "'sym")
    let sep = vals[0].getString
    let s = vals[1].getString
    var q = newSeq[MinValue](0)
    if (sep == ""):
      for c in s:
        q.add ($c).newVal
    else:
      for e in s.split(sep):
        q.add e.newVal
    i.push q.newVal

  def.symbol("join") do (i: In):
    let vals = i.expect("'sym", "quot")
    let s = vals[0]
    let q = vals[1]
    i.push q.qVal.mapIt($$it).join(s.getString).newVal 

  def.symbol("length") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.len.newVal
  
  def.symbol("lowercase") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.toLowerAscii.newVal

  def.symbol("uppercase") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.toUpperAscii.newVal

  def.symbol("capitalize") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.capitalizeAscii.newVal

  def.symbol("ord") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    if s.getString.len != 1:
      raiseInvalid("Symbol ord requires a string containing a single character.")
    i.push s.getString[0].ord.newVal
  
  def.symbol("chr") do (i: In):
    let vals = i.expect("int")
    let n = vals[0]
    let c = n.intVal.chr
    i.push ($c).newVal

  def.symbol("titleize") do (i: In):
    let vals = i.expect("'sym")
    let s = vals[0]
    i.push s.getString.split(" ").mapIt(it.capitalizeAscii).join(" ").newVal

  def.symbol("repeat") do (i: In):
    let vals = i.expect("int", "string")
    let n = vals[0]
    let s = vals[1]
    i.push s.getString.repeat(n.intVal).newVal

  def.symbol("indent") do (i: In):
    let vals = i.expect("int", "string")
    let n = vals[0]
    let s = vals[1]
    i.push s.getString.indent(n.intVal).newVal

  def.symbol("indexof") do (i: In):
    let vals = i.expect("string", "string")
    let reg = vals[0]
    let str = vals[1]
    let index = str.strVal.find(reg.strVal)
    i.push index.newVal

  def.symbol("search") do (i: In):
    let vals = i.expect("string", "string")
    let reg = vals[0]
    let str = vals[1]
    var matches = str.strVal.search(reg.strVal)
    var res = newSeq[MinValue](matches.len)
    for i in 0..matches.len-1:
      res[i] = matches[i].newVal
    i.push res.newVal

  def.symbol("match") do (i: In):
    let vals = i.expect("string", "string")
    let reg = vals[0]
    let str = vals[1]
    if str.strVal.match(reg.strVal):
      i.push true.newVal
    else:
      i.push false.newVal

  def.symbol("replace") do (i: In):
    let vals = i.expect("string", "string", "string")
    let s_replace = vals[0]
    let reg = vals[1]
    let s_find = vals[2]
    i.push sgregex.replace(s_find.strVal, reg.strVal, s_replace.strVal).newVal

  def.symbol("regex") do (i: In):
    let vals = i.expect("string", "string")
    let reg = vals[0]
    let str = vals[1]
    let results = str.strVal =~ reg.strVal
    var res = newSeq[MinValue](0)
    for r in results:
      res.add(r.newVal)
    i.push res.newVal

  def.symbol("semver?") do (i: In):
    let vals = i.expect("string")
    let v = vals[0].strVal
    i.push v.match("^\\d+\\.\\d+\\.\\d+$").newVal
    
  def.symbol("from-semver") do (i: In):
    let vals = i.expect("string")
    let v = vals[0].strVal
    let parts = v.search("^(\\d+)\\.(\\d+)\\.(\\d+)$")
    if parts[0].len == 0:
      raiseInvalid("String '$1' is not a basic semver" % v)
    var d = newDict(i.scope)
    i.dset(d, "major", parts[1].parseInt.newVal)
    i.dset(d, "minor", parts[2].parseInt.newVal)
    i.dset(d, "patch", parts[3].parseInt.newVal)
    i.push d
    
  def.symbol("to-semver") do (i: In):
    let vals = i.expect("dict")
    let v = vals[0]
    if not v.dhas("major") or not v.dhas("minor") or not v.dhas("patch"):
      raiseInvalid("Dictionary does not contain major, minor and patch keys")
    let major = i.dget(v, "major")
    let minor = i.dget(v, "minor")
    let patch = i.dget(v, "patch") 
    if major.kind != minInt or minor.kind != minInt or patch.kind != minInt:
      raiseInvalid("major, minor, and patch values are not integers")
    i.push(newVal("$#.$#.$#" % [$major, $minor, $patch]))

  def.symbol("semver-inc-major") do (i: In):
    i.push("from-semver".newSym)
    var d = i.pop
    let cv = i.dget(d, "major")
    let v = cv.intVal + 1
    i.dset(d, "major", v.newVal)
    i.push(d)
    i.push("to-semver".newSym)

  def.symbol("semver-inc-minor") do (i: In):
    i.push("from-semver".newSym)
    var d = i.pop
    let cv = i.dget(d, "minor")
    let v = cv.intVal + 1
    i.dset(d, "minor", v.newVal)
    i.push(d)
    i.push("to-semver".newSym)

  def.symbol("semver-inc-patch") do (i: In):
    i.push("from-semver".newSym)
    var d = i.pop
    let cv = i.dget(d, "patch")
    let v = cv.intVal + 1
    i.dset(d, "patch", v.newVal)
    i.push(d)
    i.push("to-semver".newSym)

  def.symbol("escape") do (i: In):
    let vals = i.expect("'sym")
    let a = vals[0].getString
    var s = ""
    a.escapeJsonUnquoted(s)
    i.push s.newVal
    
  def.symbol("prefix") do (i: In):
    let vals = i.expect("'sym", "'sym")
    let a = vals[1].getString
    let b = vals[0].getString
    var s = b & a
    i.push s.newVal
    
  def.symbol("suffix") do (i: In):
    let vals = i.expect("'sym", "'sym")
    let a = vals[1].getString
    let b = vals[0].getString
    var s = a & b
    i.push s.newVal

  def.symbol("=~") do (i: In):
    i.push("regex".newSym)

  def.symbol("%") do (i: In):
    i.push("interpolate".newSym)

  def.symbol("=%") do (i: In):
    i.push("apply-interpolate".newSym)

  def.finalize("str")