package main

import (
	"fmt"
	"sync"
	"time"

	"github.com/bwmarrin/discordgo"

	"TerraOceanBot/db"
)

type confirmedResult struct {
	VoteID     int
	IsPositive bool
}

var voteMutex sync.Mutex
var toAnnounceResultList []confirmedResult

func listenToVoteFinishes(s *discordgo.Session) {
	for {
		voteMutex.Lock()
		for _, v := range toAnnounceResultList {
			auditLog(s, fmt.Sprintf("Announcing the result of vote %d.", v.VoteID))
			if err := db.FinishVote(v.VoteID); err != nil {
				auditLog(s, fmt.Sprintf("Error while finishing vote %d.", v.VoteID))
			}
			voteType, _ := db.GetVoteType(v.VoteID)
			voteName, _ := db.GetVoteName(v.VoteID)
			messageID, _ := db.GetMessageIDFromVote(v.VoteID)
			s.ChannelMessageEditEmbed(voteChannel, messageID, showVoteStatus(voteTypes[voteType].EmbedBuilder(v.VoteID, voteName), v.IsPositive))
			voteTypes[voteType].ResultHandler(s, v.VoteID, voteName, v.IsPositive)
		}
		toAnnounceResultList = toAnnounceResultList[:0]
		voteMutex.Unlock()
		time.Sleep(60 * time.Second)
	}
}

func checkForVoteResult(s *discordgo.Session, id int) {
	votes, err := db.GetAllVoteChoices(id)
	if err != nil {
		auditLog(s, fmt.Sprintf("Error while calculating vote result for ID %d: %s", id, err.Error()))
		return
	}
	var currentScore, totalTrust float64
	var absoluteRejectionVote bool
	for _, vote := range votes {
		if vote.Value == db.ForceRejectionVote {
			absoluteRejectionVote = true
		}
		trust, err := getTrust(s, vote.UserID)
		if err != nil {
			auditLog(s, fmt.Sprintf("Error while getting vote trust for user ID %d: %s", vote.UserID, err.Error()))
			return
		}
		currentScore += float64(vote.Value) * trust
		totalTrust += float64(trust)
	}

	totalGlobalTrust, err := getTotalTrust(s)
	if err != nil {
		auditLog(s, fmt.Sprintf("Error while getting total vote trust: %s", err.Error()))
		return
	}
	remainingTrust := totalGlobalTrust - totalTrust
	lowestPossible := (currentScore + remainingTrust) / totalGlobalTrust
	highestPossible := (currentScore + remainingTrust*5) / totalGlobalTrust

	if highestPossible <= 3.5 || absoluteRejectionVote {
		//Rejection confirmed.
		voteMutex.Lock()
		for _, v := range toAnnounceResultList {
			if v.VoteID == id {
				//It's already queued to be announced in the next announcement cycle.
				voteMutex.Unlock()
				return
			}
		}
		auditLog(s, fmt.Sprintf("Rejection of vote ID %d has been confirmed.", id))
		toAnnounceResultList = append(toAnnounceResultList, confirmedResult{
			VoteID:     id,
			IsPositive: false,
		})
		voteMutex.Unlock()
	}
	if lowestPossible >= 3.5 {
		//Acceptance confirmed.
		voteMutex.Lock()
		for _, v := range toAnnounceResultList {
			if v.VoteID == id {
				//It's already queued to be announced in the next announcement cycle.
				voteMutex.Unlock()
				return
			}
		}
		auditLog(s, fmt.Sprintf("Acceptance of vote ID %d has been confirmed.", id))
		toAnnounceResultList = append(toAnnounceResultList, confirmedResult{
			VoteID:     id,
			IsPositive: true,
		})
		voteMutex.Unlock()
	}
}

func showVoteStatus(embed *discordgo.MessageEmbed, isPositive bool) *discordgo.MessageEmbed {
	if isPositive {
		embed.Color = 0x00F000
		embed.Title = "投票通过 Vote Passed"
	} else {
		embed.Color = 0xF00000
		embed.Title = "投票不通过 Vote Rejected"
	}
	return embed
}