using System.Collections.Generic;
using System.Linq;
using static PKHeX.Core.LegalityCheckStrings;

namespace PKHeX.Core
{
    /// <summary>
    /// Formatting logic for <see cref="LegalityAnalysis"/> to create a human readable <see cref="T:System.String"/>.
    /// </summary>
    public static class LegalityFormatting
    {
        /// <summary>
        /// Creates a report message with optional verbosity for in-depth analysis.
        /// </summary>
        /// <param name="la">Legality result to format</param>
        /// <param name="verbose">Include all details in the parse, including valid check messages.</param>
        /// <returns>Single line string</returns>
        public static string Report(this LegalityAnalysis la, bool verbose = false) => verbose ? GetVerboseLegalityReport(la) : GetLegalityReport(la);

        public static ILegalityFormatter Formatter { private get; set; } = new BaseLegalityFormatter();

        public static string GetLegalityReport(LegalityAnalysis la) => Formatter.GetReport(la);
        public static string GetVerboseLegalityReport(LegalityAnalysis la) => Formatter.GetReportVerbose(la);

        public static void AddSecondaryChecksValid(IEnumerable<CheckResult> results, List<string> lines)
        {
            var outputLines = results
                .Where(chk => chk.Valid && chk.Comment != L_AValid)
                .OrderBy(chk => chk.Judgement) // Fishy sorted to top
                .Select(chk => chk.Format(L_F0_1));
            lines.AddRange(outputLines);
        }

        public static void AddSecondaryChecksInvalid(IReadOnlyList<CheckResult> results, List<string> lines)
        {
            foreach (var chk in results)
            {
                if (chk.Valid)
                    continue;
                lines.Add(chk.Format(L_F0_1));
            }
        }

        public static void AddRelearn(CheckMoveResult[] relearn, List<string> lines, bool state)
        {
            for (int i = 0; i < relearn.Length; i++)
            {
                var move = relearn[i];
                if (move.Valid == state)
                    lines.Add(move.Format(L_F0_RM_1_2, i + 1));
            }
        }

        public static void AddMoves(CheckMoveResult[] moves, List<string> lines, in int currentFormat, bool state)
        {
            for (int i = 0; i < moves.Length; i++)
            {
                var move = moves[i];
                if (move.Valid != state)
                    continue;
                var msg = move.Format(L_F0_M_1_2, i + 1);
                var gen = move.Generation;
                if (currentFormat != gen)
                    msg += $" [Gen{gen}]";
                lines.Add(msg);
            }
        }

        /// <summary>
        /// Adds information about the <see cref="LegalityAnalysis.EncounterMatch"/> to the <see cref="lines"/>.
        /// </summary>
        public static void AddEncounterInfo(LegalityAnalysis la, List<string> lines)
        {
            var enc = la.EncounterOriginal;

            // Name
            lines.Add(string.Format(L_FEncounterType_0, enc.GetEncounterName()));
            if (enc is MysteryGift g)
                lines.Add(g.CardHeader);

            // Location
            var loc = enc.GetEncounterLocation();
            if (!string.IsNullOrEmpty(loc))
                lines.Add(string.Format(L_F0_1, "Location", loc));

            // Version
            if (enc.Generation <= 2)
                lines.Add(string.Format(L_F0_1, nameof(GameVersion), enc.Version));

            // PIDIV
            AddEncounterInfoPIDIV(la, lines);
        }

        public static void AddEncounterInfoPIDIV(LegalityAnalysis la, List<string> lines)
        {
            var info = la.Info;
            if (!info.PIDParsed)
                info.PIDIV = MethodFinder.Analyze(la.pkm);
            AddEncounterInfoPIDIV(lines, info.PIDIV);
        }

        private static void AddEncounterInfoPIDIV(List<string> lines, PIDIV pidiv)
        {
            lines.Add(string.Format(L_FPIDType_0, pidiv.Type));
            if (!pidiv.NoSeed)
                lines.Add(string.Format(L_FOriginSeed_0, pidiv.OriginSeed.ToString("X8")));
        }

        public static string GetEncounterName(this IEncounterable enc)
        {
            var str = ParseSettings.SpeciesStrings;
            var name = (uint) enc.Species < str.Count ? str[enc.Species] : enc.Species.ToString();
            return $"{enc.LongName} ({name})";
        }

        public static string? GetEncounterLocation(this IEncounterTemplate enc)
        {
            if (enc is not ILocation loc)
                return null;
            return loc.GetEncounterLocation(enc.Generation, (int)enc.Version);
        }
    }
}