////////////////////////////////////////////////////////////////////////////////
//
// Copyright 2006 - 2021, Tomas Babej, Paul Beckingham, Federico Hernandez.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
//
// https://www.opensource.org/licenses/mit-license.php
//
////////////////////////////////////////////////////////////////////////////////

#include <cmake.h>
// cmake.h include header must come first

#include <CmdTimesheet.h>
#include <algorithm>
#include <sstream>
#include <stdlib.h>
#include <Context.h>
#include <Filter.h>
#include <Table.h>
#include <Datetime.h>
#include <main.h>
#include <util.h>
#include <format.h>

////////////////////////////////////////////////////////////////////////////////
CmdTimesheet::CmdTimesheet ()
{
  _keyword               = "timesheet";
  _usage                 = "task [filter] timesheet";
  _description           = "Summary of completed and started tasks";
  _read_only             = true;
  _displays_id           = false;
  _needs_gc              = true;
  _uses_context          = false;
  _accepts_filter        = true;
  _accepts_modifications = false;
  _accepts_miscellaneous = false;
  _category              = Command::Category::report;
}

////////////////////////////////////////////////////////////////////////////////
// Whether a the timesheet uses context is defined by the
// report.timesheet.context configuration variable.
//
bool CmdTimesheet::uses_context () const
{
  auto config = Context::getContext ().config;
  auto key = "report.timesheet.context";

  if (config.has (key))
    return config.getBoolean (key);
  else
    return _uses_context;
}


////////////////////////////////////////////////////////////////////////////////
int CmdTimesheet::execute (std::string& output)
{
  int rc = 0;

  // Detect a filter.
  bool hasFilter {false};
  for (auto& a : Context::getContext ().cli2._args)
  {
    if (a.hasTag ("FILTER"))
    {
      hasFilter = true;
      break;
    }
  }

  if (! hasFilter)
  {
    auto defaultFilter = Context::getContext ().config.get ("report.timesheet.filter");
    if (defaultFilter == "")
      defaultFilter = "(+PENDING and start.after:now-4wks) or (+COMPLETED and end.after:now-4wks)";
    Context::getContext ().cli2.addFilter (defaultFilter);
  }

  // Apply filter to get a set of tasks.
  handleUntil ();
  handleRecurrence ();
  Filter filter;
  std::vector <Task> filtered;
  filter.subset (filtered);

  // Subset the tasks to only those that are either completed or started.
  // The _key attribute is represents either the 'start' or 'end' date.
  int num_completed = 0;
  int num_started = 0;
  std::vector <Task> shown;
  for (auto& task : filtered)
  {
    if (task.getStatus () == Task::completed)
    {
      task.set ("_key", task.get ("end"));
      ++num_completed;
    }

    if (task.getStatus () == Task::pending && task.has ("start"))
    {
      task.set ("_key", task.get ("start"));
      ++num_started;
    }

    shown.push_back (task);
  }

  // Sort tasks by _key.
  std::sort (shown.begin (),
             shown.end (),
             [](const Task& a, const Task& b) { return a.get ("_key") < b.get ("_key"); });

  // Render the completed table.
  Table table;
  table.width (Context::getContext ().getWidth ());
  if (Context::getContext ().config.getBoolean ("obfuscate"))
    table.obfuscate ();
  table.add ("Wk");
  table.add ("Date");
  table.add ("Day");
  table.add ("ID");
  table.add ("Action");
  table.add ("Project");
  table.add ("Due");
  table.add ("Task");
  setHeaderUnderline (table);

  auto dateformat = Context::getContext ().config.get ("dateformat");

  int previous_week = -1;
  std::string previous_date = "";
  std::string previous_day = "";
  int weekCounter = 0;
  Color week_color;
  for (auto& task : shown)
  {
    Datetime key (task.get_date ("_key"));

    std::string label = task.has ("end")   ? "Completed"
                      : task.has ("start") ? "Started"
                      :                      "";

    auto week = key.week ();
    auto date = key.toString (dateformat);
    auto due  = task.has ("due") ? Datetime (task.get ("due")).toString (dateformat) : "";
    auto day  = Datetime::dayNameShort (key.dayOfWeek ());

    Color task_color;
    autoColorize (task, task_color);

    // Add a blank line between weeks.
    if (week != previous_week && previous_week != -1)
    {
      auto row = table.addRowEven ();
      table.set (row, 0, " ");
    }

    // Keep track of unique week numbers.
    if (week != previous_week)
      ++weekCounter;

    // User-defined oddness.
    int row;
    if (weekCounter % 2)
      row = table.addRowOdd ();
    else
      row = table.addRowEven ();

    // If the data doesn't change, it doesn't get shown.
    table.set (row, 0, (week != previous_week ? format ("W{1}", week) : ""));
    table.set (row, 1, (date != previous_date ? date                  : ""));
    table.set (row, 2, (day != previous_day   ? day                   : ""));
    table.set (row, 3, task.identifier(true));
    table.set (row, 4, label);
    table.set (row, 5, task.get ("project"));
    table.set (row, 6, due);
    table.set (row, 7, task.get ("description"), task_color);

    previous_week = week;
    previous_date = date;
    previous_day  = day;
  }

  // Render the table.
  std::stringstream out;
  if (table.rows ())
    out << optionalBlankLine ()
        << table.render ()
        << '\n';

  if (Context::getContext ().verbose ("affected"))
    out << format ("{1} completed, {2} started.", num_completed, num_started)
        << '\n';

  output = out.str ();
  return rc;
}

////////////////////////////////////////////////////////////////////////////////