#include "output_compressed.hpp"
#include "inspect.hpp"
#include "ast.hpp"
#include "context.hpp"
#include "to_string.hpp"
#include "util.hpp"
#include <cmath>
#include <iomanip>

namespace Sass {
  using namespace std;

  Output_Compressed::Output_Compressed(Context* ctx) : buffer(""), rendered_imports(""), ctx(ctx), seen_utf8(false) { }
  Output_Compressed::~Output_Compressed() { }

  inline void Output_Compressed::fallback_impl(AST_Node* n)
  {
    Inspect i(ctx);
    n->perform(&i);
    const string& text = i.get_buffer();
    for(const char& chr : text) {
      // abort clause
      if (seen_utf8) break;
      // skip all normal ascii chars
      if (Util::isAscii(chr)) continue;
      // singleton
      seen_utf8 = true;
    }
    buffer += text;
    if (ctx && !ctx->_skip_source_map_update)
      ctx->source_map.update_column(text);
  }

  void Output_Compressed::operator()(Import* imp)
  {
    Inspect insp(ctx);
    imp->perform(&insp);
    rendered_imports += insp.get_buffer();
  }

  void Output_Compressed::operator()(Block* b)
  {
    if (!b->is_root()) return;
    for (size_t i = 0, L = b->length(); i < L; ++i) {
      (*b)[i]->perform(this);
    }
  }

  void Output_Compressed::operator()(Ruleset* r)
  {
    Selector* s     = r->selector();
    Block*    b     = r->block();

    // Filter out rulesets that aren't printable (process its children though)
    if (!Util::isPrintable(r)) {
      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (dynamic_cast<Has_Block*>(stm)) {
          stm->perform(this);
        }
      }
      return;
    }

    if (b->has_non_hoistable()) {
      s->perform(this);
      append_singleline_part_to_buffer("{");
      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (!stm->is_hoistable()) {
          stm->perform(this);
        }
      }
      size_t l = buffer.length();
      if (l > 0 && buffer.at(l - 1) == ';') buffer.erase(l - 1);
      append_singleline_part_to_buffer("}");
    }

    if (b->has_hoistable()) {
      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (stm->is_hoistable()) {
          stm->perform(this);
        }
      }
    }
  }

  void Output_Compressed::operator()(Media_Block* m)
  {
    List*  q     = m->media_queries();
    Block* b     = m->block();

    // Filter out media blocks that aren't printable (process its children though)
    if (!Util::isPrintable(m)) {
      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (dynamic_cast<Has_Block*>(stm)) {
          stm->perform(this);
        }
      }
      return;
    }

    ctx->source_map.add_mapping(m);
    append_singleline_part_to_buffer("@media ");
    q->perform(this);
    append_singleline_part_to_buffer("{");

    Selector* e = m->selector();
    if (e && b->has_non_hoistable()) {
      // JMA - hoisted, output the non-hoistable in a nested block, followed by the hoistable
      e->perform(this);
      append_singleline_part_to_buffer("{");

      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (!stm->is_hoistable()) {
          stm->perform(this);
        }
      }

      append_singleline_part_to_buffer("}");

      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        if (stm->is_hoistable()) {
          stm->perform(this);
        }
      }
    }
    else {
      // JMA - not hoisted, just output in order
      for (size_t i = 0, L = b->length(); i < L; ++i) {
        Statement* stm = (*b)[i];
        stm->perform(this);
      }
    }

    append_singleline_part_to_buffer("}");
  }

  void Output_Compressed::operator()(At_Rule* a)
  {
    string      kwd   = a->keyword();
    Selector*   s     = a->selector();
    Expression* v     = a->value();
    Block*      b     = a->block();

    append_singleline_part_to_buffer(kwd);
    if (s) {
      append_singleline_part_to_buffer(" ");
      s->perform(this);
    }
    else if (v) {
      append_singleline_part_to_buffer(" ");
      v->perform(this);
    }

    if (!b) {
      append_singleline_part_to_buffer(";");
      return;
    }

    append_singleline_part_to_buffer("{");
    for (size_t i = 0, L = b->length(); i < L; ++i) {
      Statement* stm = (*b)[i];
      if (!stm->is_hoistable()) {
        stm->perform(this);
      }
    }

    for (size_t i = 0, L = b->length(); i < L; ++i) {
      Statement* stm = (*b)[i];
      if (stm->is_hoistable()) {
        stm->perform(this);
      }
    }

    append_singleline_part_to_buffer("}");
  }

  void Output_Compressed::operator()(Declaration* d)
  {
    bool bPrintExpression = true;
    // Check print conditions
    if (d->value()->concrete_type() == Expression::NULL_VAL) {
      bPrintExpression = false;
    }
    if (d->value()->concrete_type() == Expression::STRING) {
      String_Constant* valConst = static_cast<String_Constant*>(d->value());
      string val(valConst->value());
      if (val.empty()) {
        bPrintExpression = false;
      }
    }
    // Print if OK
    if(bPrintExpression) {
      if (ctx) ctx->source_map.add_mapping(d->property());
      d->property()->perform(this);
      append_singleline_part_to_buffer(":");
      if (ctx) ctx->source_map.add_mapping(d->value());
      d->value()->perform(this);
      if (d->is_important()) append_singleline_part_to_buffer("!important");
      append_singleline_part_to_buffer(";");
    }
  }

  void Output_Compressed::operator()(Comment* c)
  {
    To_String to_string;
    string txt = c->text()->perform(&to_string);
    if(txt[2] != '!') {
      return;
    }
    else {
      Inspect i(ctx);
      c->perform(&i);
      const string& text = i.get_buffer();
      for(const char& chr : text) {
        // abort clause
        if (seen_utf8) break;
        // skip all normal ascii chars
        if (Util::isAscii(chr)) continue;
        // singleton
        seen_utf8 = true;
      }
      buffer += text;
      if (ctx && !ctx->_skip_source_map_update)
       ctx->source_map.update_column(text);
    }
  }

  void Output_Compressed::operator()(List* list)
  {
    string sep(list->separator() == List::SPACE ? " " : ",");
    if (list->empty()) return;
    Expression* first = (*list)[0];
    bool first_invisible = first->is_invisible();
    if (!first_invisible) first->perform(this);
    for (size_t i = 1, L = list->length(); i < L; ++i) {
      Expression* next = (*list)[i];
      bool next_invisible = next->is_invisible();
      if (i == 1 && !first_invisible && !next_invisible) append_singleline_part_to_buffer(sep);
      else if (!next_invisible)                          append_singleline_part_to_buffer(sep);
      next->perform(this);
    }
  }

  // helper function for serializing colors
  template <size_t range>
  static double cap_channel(double c) {
    if      (c > range) return range;
    else if (c < 0)     return 0;
    else                return c;
  }

  void Output_Compressed::operator()(Color* c)
  {
    stringstream ss;
    double r = round(cap_channel<0xff>(c->r()));
    double g = round(cap_channel<0xff>(c->g()));
    double b = round(cap_channel<0xff>(c->b()));
    double a = cap_channel<1>   (c->a());

    // retain the originally specified color definition if unchanged
    if (!c->disp().empty()) {
      ss << c->disp();
    }
    else if (r == 0 && g == 0 && b == 0 && a == 0) {
        ss << "transparent";
    }
    else if (a >= 1) {
      // see if it's a named color
      int numval = r * 0x10000;
      numval += g * 0x100;
      numval += b;
      if (ctx && ctx->colors_to_names.count(numval)) {
        ss << ctx->colors_to_names[numval];
      }
      else {
        // otherwise output the hex triplet
        ss << '#' << setw(2) << setfill('0');
        ss << hex << setw(2) << static_cast<unsigned long>(r);
        ss << hex << setw(2) << static_cast<unsigned long>(g);
        ss << hex << setw(2) << static_cast<unsigned long>(b);
      }
    }
    else {
      ss << "rgba(";
      ss << static_cast<unsigned long>(r) << ",";
      ss << static_cast<unsigned long>(g) << ",";
      ss << static_cast<unsigned long>(b) << ",";
      ss << a << ')';
    }
    append_singleline_part_to_buffer(ss.str());
  }

  void Output_Compressed::operator()(Media_Query_Expression* mqe)
  {
    if (mqe->is_interpolated()) {
      mqe->feature()->perform(this);
    }
    else {
      append_singleline_part_to_buffer("(");
      mqe->feature()->perform(this);
      if (mqe->value()) {
        append_singleline_part_to_buffer(":");
        mqe->value()->perform(this);
      }
      append_singleline_part_to_buffer(")");
    }
  }

  void Output_Compressed::operator()(Null* n)
  {
    // noop
  }

  void Output_Compressed::operator()(Argument* a)
  {
    if (!a->name().empty()) {
      append_singleline_part_to_buffer(a->name());
      append_singleline_part_to_buffer(":");
    }
    a->value()->perform(this);
    if (a->is_rest_argument()) {
      append_singleline_part_to_buffer("...");
    }
  }

  void Output_Compressed::operator()(Arguments* a)
  {
    append_singleline_part_to_buffer("(");
    if (!a->empty()) {
      (*a)[0]->perform(this);
      for (size_t i = 1, L = a->length(); i < L; ++i) {
        append_singleline_part_to_buffer(",");
        (*a)[i]->perform(this);
      }
    }
    append_singleline_part_to_buffer(")");
  }

  void Output_Compressed::operator()(Complex_Selector* c)
  {
    Compound_Selector*           head = c->head();
    Complex_Selector*            tail = c->tail();
    Complex_Selector::Combinator comb = c->combinator();
    if (head && head->is_empty_reference() && tail)
    {
      tail->perform(this);
      return;
    }
    if (head && !head->is_empty_reference()) head->perform(this);
    switch (comb) {
      case Complex_Selector::ANCESTOR_OF:
        if (tail) append_singleline_part_to_buffer(" ");
        break;
      case Complex_Selector::PARENT_OF:
        append_singleline_part_to_buffer(">");
        break;
      case Complex_Selector::PRECEDES:
        // Apparently need to preserve spaces around this combinator?
        if (head && !head->is_empty_reference()) append_singleline_part_to_buffer(" ");
        append_singleline_part_to_buffer("~");
        if (tail) append_singleline_part_to_buffer(" ");
        break;
      case Complex_Selector::ADJACENT_TO:
        append_singleline_part_to_buffer("+");
        break;
    }
    if (tail) tail->perform(this);
  }

  void Output_Compressed::operator()(Selector_List* g)
  {
    if (g->empty()) return;
    (*g)[0]->perform(this);
    for (size_t i = 1, L = g->length(); i < L; ++i) {
      append_singleline_part_to_buffer(",");
      (*g)[i]->perform(this);
    }
  }

  void Output_Compressed::append_singleline_part_to_buffer(const string& text)
  {
    buffer += text;
    if (ctx && !ctx->_skip_source_map_update)
      ctx->source_map.update_column(text);
    for(const char& chr : text) {
      // abort clause
      if (seen_utf8) break;
      // skip all normal ascii chars
      if (Util::isAscii(chr)) continue;
      // singleton
      seen_utf8 = true;
    }
  }

}