// Glaze Library
// For the license information refer to glaze.hpp

#pragma once

// Minified JSONC only works with /**/ style comments, so we only supports this

#include "glaze/json/json_format.hpp"

namespace glz
{
   namespace detail
   {
      template <auto Opts>
      inline void prettify_json(is_context auto&& ctx, auto&& it, auto&& end, auto&& b, auto&& ix)
      {
         constexpr bool use_tabs = Opts.indentation_char == '\t';
         constexpr auto indent_width = Opts.indentation_width;

         using enum json_type;

         std::vector<json_type> state(64);
         int64_t indent{};

         while (it < end) {
            switch (json_types[uint8_t(*it)]) {
            case String: {
               const auto value = read_json_string<Opts>(it, end);
               dump_maybe_empty(value, b, ix);
               break;
            }
            case Comma: {
               dump<','>(b, ix);
               ++it;
               if constexpr (Opts.new_lines_in_arrays) {
                  append_new_line<use_tabs, indent_width>(b, ix, indent);
               }
               else {
                  if (state[indent] == Object_Start) {
                     append_new_line<use_tabs, indent_width>(b, ix, indent);
                  }
                  else {
                     if constexpr (use_tabs) {
                        dump<'\t'>(b, ix);
                     }
                     else {
                        dump<' '>(b, ix);
                     }
                  }
               }
               break;
            }
            case Number: {
               const auto value = read_json_number<Opts.null_terminated>(it, end);
               dump_not_empty(value, b, ix);
               break;
            }
            case Colon: {
               if constexpr (use_tabs) {
                  dump<":\t">(b, ix);
               }
               else {
                  dump<": ">(b, ix);
               }
               ++it;
               break;
            }
            case Array_Start: {
               dump<'['>(b, ix);
               ++it;
               ++indent;
               if (size_t(indent) >= state.size()) [[unlikely]] {
                  state.resize(state.size() * 2);
               }
               state[indent] = Array_Start;
               if constexpr (Opts.new_lines_in_arrays) {
                  if constexpr (not Opts.null_terminated) {
                     if (it != end && *it != ']') {
                        append_new_line<use_tabs, indent_width>(b, ix, indent);
                     }
                  }
                  else {
                     if (*it != ']') {
                        append_new_line<use_tabs, indent_width>(b, ix, indent);
                     }
                  }
               }
               break;
            }
            case Array_End: {
               --indent;
               if (indent < 0) {
                  ctx.error = error_code::syntax_error;
                  return;
               }
               if constexpr (Opts.new_lines_in_arrays) {
                  if (it[-1] != '[') {
                     append_new_line<use_tabs, indent_width>(b, ix, indent);
                  }
               }
               dump<']'>(b, ix);
               ++it;
               break;
            }
            case Null: {
               dump<"null">(b, ix);
               it += 4;
               break;
            }
            case Bool: {
               if (*it == 't') {
                  dump<"true">(b, ix);
                  it += 4;
                  break;
               }
               else {
                  dump<"false">(b, ix);
                  it += 5;
                  break;
               }
            }
            case Object_Start: {
               dump<'{'>(b, ix);
               ++it;
               ++indent;
               if (size_t(indent) >= state.size()) [[unlikely]] {
                  state.resize(state.size() * 2);
               }
               state[indent] = Object_Start;
               if constexpr (not Opts.null_terminated) {
                  if (it != end && *it != '}') [[unlikely]] {
                     append_new_line<use_tabs, indent_width>(b, ix, indent);
                  }
               }
               else {
                  if (*it != '}') {
                     append_new_line<use_tabs, indent_width>(b, ix, indent);
                  }
               }
               break;
            }
            case Object_End: {
               --indent;
               if (indent < 0) {
                  ctx.error = error_code::syntax_error;
                  return;
               }
               if (it[-1] != '{') {
                  append_new_line<use_tabs, indent_width>(b, ix, indent);
               }
               dump<'}'>(b, ix);
               ++it;
               break;
            }
            case Comment: {
               if constexpr (Opts.comments) {
                  const auto value = read_jsonc_comment(it, end);
                  dump_not_empty(value, b, ix);
                  break;
               }
               else {
                  [[fallthrough]];
               }
            }
            [[unlikely]] default: {
               ctx.error = error_code::syntax_error;
               return;
            }
            }
         }
      }

      template <auto Opts, contiguous In, output_buffer Out>
      inline void prettify_json(is_context auto&& ctx, In&& in, Out&& out)
      {
         if constexpr (resizable<Out>) {
            if (in.empty()) {
               out.clear();
               return;
            }
            out.resize(in.size() * 2);
         }
         size_t ix = 0;
         auto [it, end] = read_iterators<Opts>(in);
         if (bool(ctx.error)) [[unlikely]] {
            return;
         }

         if constexpr (string_t<In>) {
            prettify_json<opt_true<Opts, &opts::null_terminated>>(ctx, it, end, out, ix);
         }
         else {
            prettify_json<opt_false<Opts, &opts::null_terminated>>(ctx, it, end, out, ix);
         }

         if constexpr (resizable<Out>) {
            out.resize(ix);
         }
      }
   }

   // We don't return errors from prettifying even though they are handled because the error case
   // should not happen since we prettify auto-generated JSON.
   // The detail version can be used if error context is needed

   template <auto Opts = opts{}>
   inline void prettify_json(const auto& in, auto& out)
   {
      context ctx{};
      detail::prettify_json<Opts>(ctx, in, out);
   }

   /// <summary>
   /// allocating version of prettify
   /// </summary>
   template <auto Opts = opts{}>
   inline std::string prettify_json(const auto& in)
   {
      context ctx{};
      std::string out{};
      detail::prettify_json<Opts>(ctx, in, out);
      return out;
   }

   template <auto Opts = opts{}>
   inline void prettify_jsonc(const auto& in, auto& out)
   {
      context ctx{};
      detail::prettify_json<opt_true<Opts, &opts::comments>>(ctx, in, out);
   }

   /// <summary>
   /// allocating version of prettify
   /// </summary>
   template <auto Opts = opts{}>
   inline std::string prettify_jsonc(const auto& in)
   {
      context ctx{};
      std::string out{};
      detail::prettify_json<opt_true<Opts, &opts::comments>>(ctx, in, out);
      return out;
   }
}
