using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;

namespace System.Fire.Container {

    public partial class ContainerList {


        /// <summary>
        /// Create a new Data-Stack to store the data in
        /// </summary>
        /// <param name="FileName">Set a file name for the data</param>
        /// <returns>Returns the Stack-ID. If it failed to create a stack, it will return -1</returns>
        public int CreateStack(string FileName) {
            for (int i = 0; i < 256; i++) {
                if (this._stack[i] == null) {
                    this._stack[i] = new ContainerStack(FileName);
                    this._stack[i].IsDone = false;
                    return i;
                }
            }
            return -1;
        }

        /// <summary>
        /// Create a new Data-Stack to store the data in
        /// </summary>
        /// <returns>Returns the Stack-ID. If it failed to create a stack, it will return -1</returns>
        public int CreateStack() {
            for (int i = 0; i < 256; i++) {
                if (this._stack[i] == null) {
                    this._stack[i] = new ContainerStack();
                    this._stack[i].IsDone = false;
                    return i;
                }
            }
            return -1;
        }

        /// <summary>
        /// Close the Stack, set the file data and write the stack
        /// </summary>
        /// <param name="StackId">The Stack-ID</param>
        /// <returns>Returns the File-ID</returns>
        public int CloseStack(int StackId) {
            this._stack[StackId].IsDone = true;
            this.WriteStack(StackId);
            ContainerFile cf = new ContainerFile();
            byte[] chunks = this._stack[StackId].getStackPositions();
            cf.UploadDate = DateTime.Now;
            cf.FileInfoPos = this.WriteFileInfo(new FileInfoX(this._stack[StackId].FileName));
            cf.ChunkPos = this.WriteChunk(chunks);
            cf.ChunkLen = chunks.Length;
            cf.Size = this._stack[StackId].WrittenBytes;
            cf.MediaType = Mime.getMediaType(this._stack[StackId].FileName);
            this._stack[StackId] = null;
            int fi = this._files.Count();
            this._files.Add(cf);
            return fi;
        }

        /// <summary>
        /// Write one chunk from the stack into a container
        /// </summary>
        /// <param name="stackId">The Stack-ID</param>
        private void WriteStack(int stackId) {
            // Get best container
            this.WriteStack(this._stack[stackId]);
        }

        /// <summary>
        /// Write one chunk from the stack into a container
        /// </summary>
        /// <param name="stack">The Stack</param>
        private void WriteStack(ContainerStack stack) {
            Container c = this.GetBestContainer(stack);
            ushort pos = c.WriteChunk(stack.read(c.ChunkSize));
            /*System.Diagnostics.Debug.WriteLine("Writ: " +
                c.GroupId.ToString().PadLeft(3) + " | " +
                c.ContainerId.ToString().PadLeft(3) + " | " +
                pos.ToString().PadLeft(3) + " | "
            );*/
            stack.AddStackPosition(c, pos);
        }

        /// <summary>
        /// Writes all data from a stack into a container
        /// </summary>
        /// <param name="stackId">The Stack-ID</param>
        private void WriteAllStack(int stackId) {
            // Get best container
            this.WriteAllStack(this._stack[stackId]);
        }

        /// <summary>
        /// Writes all data from a stack into a container
        /// </summary>
        /// <param name="stack">The Stack</param>
        private void WriteAllStack(ContainerStack stack) {
            while (stack.Size > 0) {
                Container c = this.GetBestContainer(stack);
                ushort pos = c.WriteChunk(stack.read(c.ChunkSize));
                System.Diagnostics.Debug.WriteLine("Writ: " +
                    c.GroupId.ToString().PadLeft(3) + " | " +
                    c.ContainerId.ToString().PadLeft(3) + " | " +
                    pos.ToString().PadLeft(3) + " | "
                );
                stack.AddStackPosition(c, pos);
            }
        }

    }

}