/// <summary>
/// Returns a random quest ID from QuestIdSkillRankList,
/// based on the current Erinn day and the player's blacksmithing
/// PTJ level/skill rank (via <paramref name="npc"/>).
/// </summary>
/// <param name="npc"></param>
/// <returns>
/// Will always return a quest ID of the given <paramref name="level"/>.
/// However, if no job of the matching rank can be found,
/// a job of next-highest rank will be returned.
/// </returns>
/// <remarks>
/// As there are (at the time of writing) only jobs of rank F, C, B, and A,
/// the ranks that are supplied to and returned from this method are as follows:
/// <list type="table">
/// <listheader> <term>Supplied Rank</term> <term>Returned Rank</term> </listheader>
/// <item> <term>(Unlearned)</term> <term>rF</term> </item>
/// <item> <term>rN ~ rD</term> <term>rF</term> </item>
/// <item> <term>rC ~ rA</term> <term>[Same as supplied]</term></item>
/// <item> <term>r9 and up</term> <term>rA</term> </item>
/// </list>
///
/// See also: http://wiki.mabinogiworld.com/view/Thread:Talk:Edern/Part-time_job_requests
/// </remarks>
public int RandomPtj(NpcScript npc)
{
// Determine player's Blacksmithing skill level
var playerSkills = npc.Player.Skills;
var skillRank = playerSkills.Has(SkillId.Blacksmithing)
? playerSkills.Get(SkillId.Blacksmithing).Info.Rank
: SkillRank.RF; // Default to RF jobs if player does not know Blacksmithing.
var ptjQuestLevel = npc.GetPtjQuestLevel(JobType);
Func <SkillRank, IEnumerable <int> > GetSameRankQuests = r => QuestIdSkillRankList
.Where(pair => pair.Item2 == r) // Filter on skill rank
.Select(pair => pair.Item1); // Get resulting quest IDs
Func <IEnumerable <int>, int> GetRandomIdOfTheDay = ids => ids.ElementAt(new Random(ErinnTime.Now.DateTimeStamp).Next(ids.Count()));
var rankProbe = skillRank;
var sameLevelQuestIds = npc.GetLevelMatchingQuestIds(JobType, QuestIdSkillRankList.Select(pair => pair.Item1).ToArray());
IEnumerable <int> matchingQuestIds;
// Clamp on rank A, the most difficult job available.
if (rankProbe > SkillRank.RA)
{
rankProbe = SkillRank.RA;
}
// Filter on skill rank, retrying on a lower rank if no results.
while (rankProbe >= SkillRank.RC)
{
// Merge with filter on sameLevelQuestIds.
matchingQuestIds = GetSameRankQuests(rankProbe).Where(id => sameLevelQuestIds.Contains(id));
if (matchingQuestIds.Any())
{
return(GetRandomIdOfTheDay(matchingQuestIds));
}
else
{
--rankProbe; // Retry on lower rank.
}
}
// Else no matching jobs at A, B, or C.
// Try rank F jobs?
matchingQuestIds = GetSameRankQuests(SkillRank.RF).Where(id => sameLevelQuestIds.Contains(id));
if (matchingQuestIds.Any())
{
return(GetRandomIdOfTheDay(matchingQuestIds));
}
// Else no matching jobs at F.
// If this point is reached,
// we were not able to find a quest for the player.
throw new Exception(string.Format("EdernPtjScript.RandomPtj: Unable to provide a quest for level:{0}, rank:{1}", ptjQuestLevel, skillRank));
}