using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Globalization;
using System.Threading.Tasks;
using NonaBGS.Journal;

namespace NonaBGS.BGS {
    public class NonaDiscordLog : IDiscordLogGenerator {
        private string FormatDate() {
            StringBuilder date = new StringBuilder();
            DateTime today = DateTime.Now;
            string suffix;

            if (today.Day == 1 || today.Day == 21 || today.Day == 31) {
                suffix = "st";
            } else if (today.Day == 2 || today.Day == 22) {
                suffix = "nd";
            } else {
                suffix = "th";
            }

            date.AppendFormat("{0} {1}{2}, {3}",
                today.ToString("MMMM"), today.Day, suffix,
                today.Year + EliteDangerous.YearOffset
                );

            return date.ToString();
        }

        private string BuildCartoGraphics(Objective objective) {
            var total = from entries in objective.LogEntries
                        where entries.GetType() == typeof(Cartographics)
                        select entries
                        ;
            var pages = total.Count();
            var sum = total.Sum(x => (x as Cartographics).TotalSum);

            if (pages <= 0 || sum <= 0) {
                return "";
            }

            return string.Format("Sold {0} page(s) worth of universal cartographics\n" +
                                 "(Total value: {1} CR)\n", pages, sum);
        }

        private string BuildMicroResourcesSold(Objective objective) {
            var total = from entries in objective.LogEntries
                        where entries.GetType() == typeof(SellMicroResources)
                        select entries
                        ;
            var sum = total.Sum(x => (x as SellMicroResources).TotalSum);

            if (sum <= 0) {
                return "";
            }

            return string.Format("Sold {0} CR worth of Micro Resources\n", sum);
        }

        private string BuildVouchers(Objective objective) {
            StringBuilder builder = new StringBuilder();
            var missions = from entries in objective.LogEntries
                           where entries.GetType() == typeof(Vouchers)
                           select entries
                           ;

            if (missions == null || missions.Count() <= 0) {
                return "";
            }

            foreach (var mission in missions) {
                var m = mission as Vouchers;
                builder.AppendFormat("Handed in {0} vouchers for {1}\n", m.Type, m.Faction);
                builder.AppendFormat("(Total value: {0} CR)\n", m.TotalSum);
                builder.AppendFormat("\n");
            }

            return builder.ToString();
        }

        private string BuildMissionList(Objective objective) {
            Dictionary<string, Dictionary<string, int>> collated = new Dictionary<string, Dictionary<string, int>>();
            StringBuilder output = new StringBuilder();

            var missions = from entries in objective.LogEntries
                           where entries.GetType() == typeof(MissionCompleted)
                           select entries
                           ;

            if (missions == null) {
                return "";
            }

            foreach (MissionCompleted m in missions) {
                if (!collated.ContainsKey(m.MissionName)) {
                    collated[m.MissionName] = new Dictionary<string, int>();
                }
                if (!collated[m.MissionName].ContainsKey(m.Influence)) {
                    collated[m.MissionName][m.Influence] = 0;
                }

                ++collated[m.MissionName][m.Influence];
            }

            foreach (var mission in collated) {
                if (objective.Faction != null) {
                    output.AppendFormat("{0} for {1}\n", mission.Key, objective.Faction);
                } else {
                    output.AppendFormat("{0}\n", mission.Key);
                }
                output.Append("(");
                foreach (var influence in mission.Value.OrderBy(x => x.Key.Length)) {
                    output.AppendFormat("Inf{0} x{1}, ", influence.Key, influence.Value);
                }
                output.Remove(output.Length - 2, 2); // remove last ", "
                output.Append(")\n\n");
            }

            return output.ToString();
        }

        public string GenerateDiscordLog(Report report) {
            StringBuilder log = new StringBuilder();

            log.AppendFormat(":clock2: `Date:` {0}\n", FormatDate());
            foreach (var objective in report.Objectives) {
                if (objective.LogEntries.Count <= 0) {
                    continue;
                }

                log.AppendFormat(":globe_with_meridians: `Location:` {0}\n", objective.ToShortString());
                log.Append(":clipboard: `Conducted:`\n");
                log.Append("```\n");

                StringBuilder entries = new StringBuilder();

                var missions = BuildMissionList(objective);
                entries.Append(missions);

                var vouchers = BuildVouchers(objective);
                entries.Append(vouchers);

                var carto = BuildCartoGraphics(objective);
                entries.Append(carto);

                var micro = BuildMicroResourcesSold(objective);
                entries.Append(micro);

                log.Append(entries.ToString().Trim());
                log.Append("\n```\n");
            }

            return log.ToString();
        }
    }
}