/*
  Licensed to the Apache Software Foundation (ASF) under one
  or more contributor license agreements.  See the NOTICE file
  distributed with this work for additional information
  regarding copyright ownership.  The ASF licenses this file
  to you under the Apache License, Version 2.0 (the
  "License"); you may not use this file except in compliance
  with the License.  You may obtain a copy of the License at

  http://www.apache.org/licenses/LICENSE-2.0

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
*/

#include "ts_lua_util.h"

static int ts_lua_client_handler(TSCont contp, ts_lua_http_transform_ctx *transform_ctx, TSEvent event, int n);
static int ts_lua_transform_handler(TSCont contp, ts_lua_http_transform_ctx *transform_ctx, TSEvent event, int n);

int
ts_lua_client_entry(TSCont contp, TSEvent ev, void *edata)
{
  int                        n, event;
  TSVIO                      input_vio;
  ts_lua_http_transform_ctx *transform_ctx;

  event         = (int)ev;
  transform_ctx = (ts_lua_http_transform_ctx *)TSContDataGet(contp);

  n = 0;

  switch (event) {
  case TS_EVENT_ERROR:
    input_vio = TSVConnWriteVIOGet(contp);
    TSContCall(TSVIOContGet(input_vio), TS_EVENT_ERROR, input_vio);
    break;

  case TS_EVENT_VCONN_WRITE_COMPLETE:
    Dbg(dbg_ctl, "[%s] received TS_EVENT_VCONN_WRITE_COMPLETE", __FUNCTION__);
    break;

  case TS_LUA_EVENT_COROUTINE_CONT:
    n = (intptr_t)edata;
  /* FALL THROUGH */
  case TS_EVENT_VCONN_WRITE_READY:
  default:
    ts_lua_client_handler(contp, transform_ctx, TSEvent(event), n);
    break;
  }

  return 0;
}

static int
ts_lua_client_handler(TSCont contp, ts_lua_http_transform_ctx *transform_ctx, TSEvent event, int n)
{
  TSVIO             input_vio;
  TSIOBufferReader  input_reader = nullptr;
  TSIOBufferBlock   blk;
  int64_t           toread, towrite, blk_len, upstream_done, input_avail, input_wm_bytes;
  const char       *start;
  int               ret, eos, rc, top, empty_input;
  ts_lua_coroutine *crt;
  ts_lua_cont_info *ci;

  lua_State *L;
  TSMutex    mtxp;

  ci  = &transform_ctx->cinfo;
  crt = &ci->routine;

  mtxp = crt->mctx->mutexp;
  L    = crt->lua;

  input_vio = TSVConnWriteVIOGet(contp);

  empty_input = 0;
  if (!TSVIOBufferGet(input_vio)) {
    Dbg(dbg_ctl, "[%s] no input VIO and output VIO", __FUNCTION__);
    empty_input = 1;
  } else { // input VIO exists
    input_wm_bytes = TSIOBufferWaterMarkGet(TSVIOBufferGet(input_vio));
    if (transform_ctx->upstream_watermark_bytes >= 0 && transform_ctx->upstream_watermark_bytes != input_wm_bytes) {
      Dbg(dbg_ctl, "[%s] Setting input_vio watermark to %" PRId64 " bytes", __FUNCTION__, transform_ctx->upstream_watermark_bytes);
      TSIOBufferWaterMarkSet(TSVIOBufferGet(input_vio), transform_ctx->upstream_watermark_bytes);
    }
  }

  if (empty_input == 0) {
    input_reader = TSVIOReaderGet(input_vio);
  }

  if (!transform_ctx->output.buffer) {
    transform_ctx->output.buffer = TSIOBufferCreate();
    transform_ctx->output.reader = TSIOBufferReaderAlloc(transform_ctx->output.buffer);

    transform_ctx->reserved.buffer = TSIOBufferCreate();
    transform_ctx->reserved.reader = TSIOBufferReaderAlloc(transform_ctx->reserved.buffer);

    if (empty_input == 0) {
      transform_ctx->upstream_bytes = TSVIONBytesGet(input_vio);
    } else {
      transform_ctx->upstream_bytes = 0;
    }

    transform_ctx->downstream_bytes = INT64_MAX;
  }

  if (empty_input == 0) {
    input_avail   = TSIOBufferReaderAvail(input_reader);
    upstream_done = TSVIONDoneGet(input_vio);
    toread        = TSVIONTodoGet(input_vio);

    if (toread <= input_avail) { // upstream finished
      eos = 1;
    } else {
      eos = 0;
    }
  } else {
    input_avail   = 0;
    upstream_done = 0;
    toread        = 0;
    eos           = 1;
  }

  if (input_avail > 0) {
    // move to the reserved.buffer
    TSIOBufferCopy(transform_ctx->reserved.buffer, input_reader, input_avail, 0);

    // reset input
    TSIOBufferReaderConsume(input_reader, input_avail);
    TSVIONDoneSet(input_vio, upstream_done + input_avail);
  }

  if (empty_input == 0) {
    towrite = TSIOBufferReaderAvail(transform_ctx->reserved.reader);
  } else {
    towrite = 0;
  }

  TSMutexLock(mtxp);
  ts_lua_set_cont_info(L, ci);

  do {
    if (event == TS_LUA_EVENT_COROUTINE_CONT) {
      event = TS_EVENT_NONE;
      goto launch;
    } else {
      n = 2;
    }

    if (towrite == 0 && empty_input == 0) {
      break;
    }

    // additional condition for client
    if (towrite == 0) {
      break;
    }

    if (empty_input == 0) {
      blk   = TSIOBufferReaderStart(transform_ctx->reserved.reader);
      start = TSIOBufferBlockReadStart(blk, transform_ctx->reserved.reader, &blk_len);

      lua_pushlightuserdata(L, transform_ctx);
      lua_rawget(L, LUA_GLOBALSINDEX); /* push function */

      if (towrite > blk_len) {
        lua_pushlstring(L, start, (size_t)blk_len);
        towrite -= blk_len;
        TSIOBufferReaderConsume(transform_ctx->reserved.reader, blk_len);
      } else {
        lua_pushlstring(L, start, (size_t)towrite);
        TSIOBufferReaderConsume(transform_ctx->reserved.reader, towrite);
        towrite = 0;
      }

      if (!towrite && eos) {
        lua_pushinteger(L, 1); /* second param, data finished */
      } else {
        lua_pushinteger(L, 0); /* second param, data not finish */
      }
    } else {
      lua_pushlightuserdata(L, transform_ctx);
      lua_rawget(L, LUA_GLOBALSINDEX); /* push function */

      lua_pushlstring(L, "", 0);
      lua_pushinteger(L, 1); /* second param, data finished */
    }

  launch:
    rc  = lua_resume(L, n);
    top = lua_gettop(L);

    switch (rc) {
    case LUA_YIELD: // coroutine yield
      TSMutexUnlock(mtxp);
      return 0;

    case 0: // coroutine success
      ret = 0;
      break;

    default: // coroutine failed
      TSError("[ts_lua][%s] lua_resume failed: %s", __FUNCTION__, lua_tostring(L, -1));
      ret = 1;
      break;
    }

    lua_pop(L, top);

    if (ret || (eos && !towrite)) { // EOS
      eos = 1;
      break;
    }

  } while (towrite > 0);

  TSMutexUnlock(mtxp);

  if (toread > input_avail) { // upstream not finished.
    if (eos) {
      if (empty_input == 0) {
        TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_EOS, input_vio);
      }
    } else {
      if (empty_input == 0) {
        TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
      }
    }
  } else { // upstream is finished.
    if (empty_input == 0) {
      TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
    }
  }

  return 0;
}

int
ts_lua_transform_entry(TSCont contp, TSEvent ev, void *edata)
{
  int                        n, event;
  TSVIO                      input_vio;
  ts_lua_http_transform_ctx *transform_ctx;

  event         = (int)ev;
  transform_ctx = (ts_lua_http_transform_ctx *)TSContDataGet(contp);

  if (TSVConnClosedGet(contp)) {
    ts_lua_destroy_http_transform_ctx(transform_ctx);
    return 0;
  }

  n = 0;

  switch (event) {
  case TS_EVENT_ERROR:
    input_vio = TSVConnWriteVIOGet(contp);
    TSContCall(TSVIOContGet(input_vio), TS_EVENT_ERROR, input_vio);
    break;

  case TS_EVENT_VCONN_WRITE_COMPLETE:
    TSVConnShutdown(TSTransformOutputVConnGet(contp), 0, 1);
    break;

  case TS_LUA_EVENT_COROUTINE_CONT:
    n = (intptr_t)edata;
  /* FALL THROUGH */
  case TS_EVENT_VCONN_WRITE_READY:
  default:
    ts_lua_transform_handler(contp, transform_ctx, TSEvent(event), n);
    break;
  }

  return 0;
}

static int
ts_lua_transform_handler(TSCont contp, ts_lua_http_transform_ctx *transform_ctx, TSEvent event, int n)
{
  TSVConn           output_conn;
  TSVIO             input_vio;
  TSIOBufferReader  input_reader = nullptr;
  TSIOBufferBlock   blk;
  int64_t           toread, towrite, blk_len, upstream_done, input_avail, input_wm_bytes, l;
  const char       *start;
  const char       *res;
  size_t            res_len;
  int               ret, eos, write_down, rc, top, empty_input;
  ts_lua_coroutine *crt;
  ts_lua_cont_info *ci;

  lua_State *L;
  TSMutex    mtxp;

  ci  = &transform_ctx->cinfo;
  crt = &ci->routine;

  mtxp = crt->mctx->mutexp;
  L    = crt->lua;

  output_conn = TSTransformOutputVConnGet(contp);
  input_vio   = TSVConnWriteVIOGet(contp);

  empty_input = 0;
  if (!TSVIOBufferGet(input_vio)) {
    if (transform_ctx->output.vio) {
      Dbg(dbg_ctl, "[%s] reenabling output VIO after input VIO does not exist", __FUNCTION__);
      TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
      TSVIOReenable(transform_ctx->output.vio);
      return 0;
    } else {
      Dbg(dbg_ctl, "[%s] no input VIO and output VIO", __FUNCTION__);
      empty_input = 1;
    }
  } else { // input VIO exists
    input_wm_bytes = TSIOBufferWaterMarkGet(TSVIOBufferGet(input_vio));
    if (transform_ctx->upstream_watermark_bytes >= 0 && transform_ctx->upstream_watermark_bytes != input_wm_bytes) {
      Dbg(dbg_ctl, "[%s] Setting input_vio watermark to %" PRId64 " bytes", __FUNCTION__, transform_ctx->upstream_watermark_bytes);
      TSIOBufferWaterMarkSet(TSVIOBufferGet(input_vio), transform_ctx->upstream_watermark_bytes);
    }
  }

  if (empty_input == 0) {
    input_reader = TSVIOReaderGet(input_vio);
  }

  if (!transform_ctx->output.buffer) {
    transform_ctx->output.buffer = TSIOBufferCreate();
    transform_ctx->output.reader = TSIOBufferReaderAlloc(transform_ctx->output.buffer);

    transform_ctx->reserved.buffer = TSIOBufferCreate();
    transform_ctx->reserved.reader = TSIOBufferReaderAlloc(transform_ctx->reserved.buffer);

    if (empty_input == 0) {
      transform_ctx->upstream_bytes = TSVIONBytesGet(input_vio);
    } else {
      transform_ctx->upstream_bytes = 0;
    }

    transform_ctx->downstream_bytes = INT64_MAX;
  }

  if (empty_input == 0) {
    input_avail   = TSIOBufferReaderAvail(input_reader);
    upstream_done = TSVIONDoneGet(input_vio);
    toread        = TSVIONTodoGet(input_vio);

    if (toread <= input_avail) { // upstream finished
      eos = 1;
    } else {
      eos = 0;
    }
  } else {
    input_avail   = 0;
    upstream_done = 0;
    toread        = 0;
    eos           = 1;
  }

  if (input_avail > 0) {
    // move to the reserved.buffer
    TSIOBufferCopy(transform_ctx->reserved.buffer, input_reader, input_avail, 0);

    // reset input
    TSIOBufferReaderConsume(input_reader, input_avail);
    TSVIONDoneSet(input_vio, upstream_done + input_avail);
  }

  write_down = 0;
  if (empty_input == 0) {
    towrite = TSIOBufferReaderAvail(transform_ctx->reserved.reader);
  } else {
    towrite = 0;
  }

  TSMutexLock(mtxp);
  ts_lua_set_cont_info(L, ci);

  do {
    if (event == TS_LUA_EVENT_COROUTINE_CONT) {
      event = TS_EVENT_NONE;
      goto launch;
    } else {
      n = 2;
    }

    if (towrite == 0 && empty_input == 0) {
      break;
    }

    if (empty_input == 0) {
      blk   = TSIOBufferReaderStart(transform_ctx->reserved.reader);
      start = TSIOBufferBlockReadStart(blk, transform_ctx->reserved.reader, &blk_len);

      lua_pushlightuserdata(L, transform_ctx);
      lua_rawget(L, LUA_GLOBALSINDEX); /* push function */

      if (towrite > blk_len) {
        lua_pushlstring(L, start, (size_t)blk_len);
        towrite -= blk_len;
        TSIOBufferReaderConsume(transform_ctx->reserved.reader, blk_len);
      } else {
        lua_pushlstring(L, start, (size_t)towrite);
        TSIOBufferReaderConsume(transform_ctx->reserved.reader, towrite);
        towrite = 0;
      }

      if (!towrite && eos) {
        lua_pushinteger(L, 1); /* second param, data finished */
      } else {
        lua_pushinteger(L, 0); /* second param, data not finish */
      }
    } else {
      lua_pushlightuserdata(L, transform_ctx);
      lua_rawget(L, LUA_GLOBALSINDEX); /* push function */

      lua_pushlstring(L, "", 0);
      lua_pushinteger(L, 1); /* second param, data finished */
    }

  launch:
    rc  = lua_resume(L, n);
    top = lua_gettop(L);

    switch (rc) {
    case LUA_YIELD: // coroutine yield
      TSMutexUnlock(mtxp);
      return 0;

    case 0: // coroutine success
      if (top == 2) {
        ret = lua_tointeger(L, -1); /* 0 is not finished, 1 is finished */
        res = lua_tolstring(L, -2, &res_len);
      } else { // what hells code are you writing ?
        ret     = 0;
        res     = nullptr;
        res_len = 0;
      }
      break;

    default: // coroutine failed
      TSError("[ts_lua][%s] lua_resume failed: %s", __FUNCTION__, lua_tostring(L, -1));
      ret     = 1;
      res     = nullptr;
      res_len = 0;
      break;
    }

    if (res && res_len > 0) {
      if (!transform_ctx->output.vio) {
        l = transform_ctx->downstream_bytes;
        if (ret) {
          l = res_len;
        }

        transform_ctx->output.vio = TSVConnWrite(output_conn, contp, transform_ctx->output.reader, l); // HttpSM go on
      }

      TSIOBufferWrite(transform_ctx->output.buffer, res, res_len);
      transform_ctx->total += res_len;
      write_down            = 1;
    }

    lua_pop(L, top);

    if (ret || (eos && !towrite)) { // EOS
      eos = 1;
      break;
    }

  } while (towrite > 0);

  TSMutexUnlock(mtxp);

  if (eos && !transform_ctx->output.vio) {
    transform_ctx->output.vio = TSVConnWrite(output_conn, contp, transform_ctx->output.reader, 0);
  }

  if (write_down || eos) {
    TSVIOReenable(transform_ctx->output.vio);
  }

  if (toread > input_avail) { // upstream not finished.
    if (eos) {
      TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
      if (empty_input == 0) {
        TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_EOS, input_vio);
      }
    } else {
      if (empty_input == 0) {
        TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_READY, input_vio);
      }
    }
  } else { // upstream is finished.
    TSVIONBytesSet(transform_ctx->output.vio, transform_ctx->total);
    if (empty_input == 0) {
      TSContCall(TSVIOContGet(input_vio), TS_EVENT_VCONN_WRITE_COMPLETE, input_vio);
    }
  }

  return 0;
}