using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using BepInEx.Bootstrap;

namespace BepInEx;

/// <summary>
///     Data class that represents information about a loadable BepInEx plugin.
///     Contains all metadata and additional info required for plugin loading by <see cref="Chainloader" />.
/// </summary>
public class PluginInfo : ICacheable
{
    /// <summary>
    ///     General metadata about a plugin.
    /// </summary>
    public BepInPlugin Metadata { get; internal set; }

    /// <summary>
    ///     Collection of <see cref="BepInProcess" /> attributes that describe what processes the plugin can run on.
    /// </summary>
    public IEnumerable<BepInProcess> Processes { get; internal set; }

    /// <summary>
    ///     Collection of <see cref="BepInDependency" /> attributes that describe what plugins this plugin depends on.
    /// </summary>
    public IEnumerable<BepInDependency> Dependencies { get; internal set; }

    /// <summary>
    ///     Collection of <see cref="BepInIncompatibility" /> attributes that describe what plugins this plugin
    ///     is incompatible with.
    /// </summary>
    public IEnumerable<BepInIncompatibility> Incompatibilities { get; internal set; }

    /// <summary>
    ///     File path to the plugin DLL
    /// </summary>
    public string Location { get; internal set; }

    /// <summary>
    ///     Instance of the plugin that represents this info. NULL if no plugin is instantiated from info (yet)
    /// </summary>
    public object Instance { get; internal set; }

    public string TypeName { get; internal set; }

    internal Version TargettedBepInExVersion { get; set; }

    void ICacheable.Save(BinaryWriter bw)
    {
        bw.Write(TypeName);
        bw.Write(Location);

        bw.Write(Metadata.GUID);
        bw.Write(Metadata.Name);
        bw.Write(Metadata.Version.ToString());

        var processList = Processes.ToList();
        bw.Write(processList.Count);
        foreach (var bepInProcess in processList)
            bw.Write(bepInProcess.ProcessName);

        var depList = Dependencies.ToList();
        bw.Write(depList.Count);
        foreach (var bepInDependency in depList)
            ((ICacheable) bepInDependency).Save(bw);

        var incList = Incompatibilities.ToList();
        bw.Write(incList.Count);
        foreach (var bepInIncompatibility in incList)
            ((ICacheable) bepInIncompatibility).Save(bw);

        bw.Write(TargettedBepInExVersion.ToString(4));
    }

    void ICacheable.Load(BinaryReader br)
    {
        TypeName = br.ReadString();
        Location = br.ReadString();

        Metadata = new BepInPlugin(br.ReadString(), br.ReadString(), br.ReadString());

        var processListCount = br.ReadInt32();
        var processList = new List<BepInProcess>(processListCount);
        for (var i = 0; i < processListCount; i++)
            processList.Add(new BepInProcess(br.ReadString()));
        Processes = processList;

        var depCount = br.ReadInt32();
        var depList = new List<BepInDependency>(depCount);
        for (var i = 0; i < depCount; i++)
        {
            var dep = new BepInDependency("");
            ((ICacheable) dep).Load(br);
            depList.Add(dep);
        }

        Dependencies = depList;

        var incCount = br.ReadInt32();
        var incList = new List<BepInIncompatibility>(incCount);
        for (var i = 0; i < incCount; i++)
        {
            var inc = new BepInIncompatibility("");
            ((ICacheable) inc).Load(br);
            incList.Add(inc);
        }

        Incompatibilities = incList;

        TargettedBepInExVersion = new Version(br.ReadString());
    }

    /// <inheritdoc />
    public override string ToString() => $"{Metadata?.Name} {Metadata?.Version}";
}
