/**
 * BBTimeline
 * @version v0.1.1.121 beta (2023/10/18 2058)
 */
class BBTimeline {
  constructor(el) {
    const a = this;

    a.Container = document.getElementById(el);
    a.Padding = {
      Left: 20,
      Top: 20,
      Right: 20,
      Bottom: 0
    };
    a.Size = {
      W: a.Container.innerWidth || a.Container.clientWidth,
      H: a.Container.innerHeight || a.Container.clientHeight
    };
    a.Layer = {
      Background: null,
      Flourish: null,
      Markers: null
    };

    a.DateParsePattern = "yyyy-MM-dd";

    a.Axis = {
      LineColour1: "#CFCFCF",
      LineWidth: 1,
      Font: "8pt Arial",
      LabelColour: "#000000",
      LabelSpacing: 6,
      X: {
        NoPartPerDay: 4,
        HourLineSpace: 6,
        HourLineHeight: 10,
        HourLineColour: "#A6A6A6",
        DayLineHeight: 20,
        DayLineColour: "#282828"
      }
    };

    a.Marker = {
      BorderColour: "#3A5D9C",
      BorderWidth: 2,
      BackColour: "#D4DEEF",
      Width: 10,
      ForeColour: "#3A5D9C",
      Font: "9pt Arial",
      CollisionMargin: 8
    };

    a.HighlightLine = {
      Colour: "#A6A6A6",
      Width: 1,
    };

    a.Events = [];
    a.StartDate = a.DateToString(new Date(), a.DateParsePattern);
    a.ShowDate = a.StartDate;
    // a.GraphRectangle = a.calcGraphRectangle();

    a.Enabled = false;
    a.Debug = false;

    a.initialiseComponents();
  }

  AddEvent(date, label, options) {
    const a = this;

    const _options = Object.assign(a.GenerateEventItem(), options);

    let event = a.FindEvent(date);
    if (event == null) {
      a.Events.push(a.GenerateEvent(date));

      event = a.FindEvent(date);
    }

    if (label != null) {
      event.Label = label;
    }

    event.Events.push(_options);
  }

  CalcEndDate() {
    const a = this;
    const clientWidth = (a.Size.W - (a.Padding.Left + a.Padding.Right));
    const calcdays = Math.floor(clientWidth / (a.Axis.X.NoPartPerDay * a.Axis.X.HourLineSpace));

    let date = a.ConvertToDate(a.ShowDate);
    date.setDate(date.getDate() + calcdays);

    // Minus one for lead up
    date.setDate(date.getDate() - 1);

    return a.DateToString(date, a.DateParsePattern);
  }

  Clear() {
    const a = this;

    a.Layer.Background.Clear();
    a.Layer.Flourish.Clear();
    a.Layer.Markers.Clear();

    a.StartDate = a.DateToString(new Date(), a.DateParsePattern);
    a.ShowDate = a.StartDate;
    a.Enabled = false;
    a.Events = [];
  }

  DeleteMarker(date)
  {
    const a = this;

    for (let i=0; i<a.Events.length; i++) {
      if (a.Events[i].Date != date) {
        continue;
      }

      a.Events.splice(i, 1);
    }
  }

  FindDatePosition(date) {
    const a = this;

    const points = a.Layer.Background.calcXAxisPositions();
    for (let i=0; i<points.length; i++) {
      if (points[i].Date == date){
        return points[i];
      }
    }

    return null;
  }

  FindVisibleEvents() {
    const a = this;
    let result = [];

    const availableX = a.Layer.Background.calcXAxisPositions();

    availableX.forEach(function (e) {
      const event = a.FindEvent(e.Date);
      if (event == null) {
        return;
      }

      // Set offsetX on current view
      event.Position.X = e.X;

      result.push(event);
    });

    return result;
  }

  FindEvent(date) {
    const a = this;

    for (let i=0; i<a.Events.length; i++) {
      if (a.Events[i].Date == date) {
        return a.Events[i];
      }
    }

    return null;
  }

  FindEventsByCoords(x, y) {
    const a = this;

    for (let i=0; i<a.Events.length; i++) {
      const e = a.Events[i].HitBox;
      if (a.Events[i].HitBox == null) {
        continue;
      }

      const x2 = (e.X + e.W);
      const y2 = (e.Y + e.H);

      if ((x >= e.X) && (x <= x2) && (y >= e.Y) && (y <= y2)){
        return a.Events[i];
      }
    }

    return null;
  }

  Load(startDate) {
    const a = this;

    a.StartDate = startDate;

    a.Show(startDate);
  }

  Show(date) {
    const a = this;

    if (a.ConvertToDate(date) < a.ConvertToDate(a.StartDate)) {
      date = a.StartDate;
    }

    a.ShowDate = date;
    a.Enabled = true;

    a.Invalidate(true, true);
  }

  // ShowNext() {
  //   const a = this;

  //   let date = a.ConvertToDate(a.ShowDate);
  //   date.setMonth(date.getMonth() + 1);

  //   a.Show(a.DateToString(date, a.DateParsePattern));
  // }

  // ShowPrevious() {
  //   const a = this;

  //   let date = a.ConvertToDate(a.ShowDate);
  //   date.setMonth(date.getMonth() - 1);

  //   a.Show(a.DateToString(date, a.DateParsePattern));
  // }

  UpdateLabel(date, label) {
    const a = this;

    let event = a.FindEvent(date);
    if (event == null) {
      return;
    }

    event.Label = label;

    a.Invalidate(false, true);
  }

  UpdateMarker(date, borderColour, backColour) {
    const a = this;

    let event = a.FindEvent(date);
    if (event == null) {
      return;
    }

    event.BorderColour = borderColour;
    event.BackColour = backColour;

    a.Invalidate(false, true);
  }

//   initialiseComponents2() {
//     const a = this;

//     a.ctx.canvas.addEventListener('mousedown', function (e) {
//       if (!a.Enabled) {
//         return;
//       }

//       var event = a.FindEventsByCoords(e.offsetX, e.offsetY);
//       if (event == null) {
//         return;
//       }

//       if (a.Debug) console.log(event);

//       a.OnMouseDown(this, e, event);
//    });

//    a.ctx.canvas.addEventListener('click', function (e) {
//     if (!a.Enabled) {
//       return;
//     }

//     var event = a.FindEventsByCoords(e.offsetX, e.offsetY);
//     if (event == null) {
//       return;
//     }

//     if (a.Debug) console.log(event);

//     a.OnClick(this, e, event);
//  });
//   }

  Invalidate(redrawAxis, redrawMarkers) {
    const a = this;

    if (redrawAxis) {
      a.Layer.Background.Invalidate();
    }

    if (redrawMarkers) {
      a.Layer.Markers.Invalidate();
    }


    return;

    if (redrawAxis) {
      a.ctx.clearRect(0, 0, a.ctx.canvas.width, a.ctx.canvas.height);

      a.drawAxis();
      a.drawXAxis();
      a.drawXAxisLabels();
    }

    if (redrawMarkers) {
      // a.clearChart();

      // const startPosY = (a.GraphRectangle.Y + a.Marker.Width);
      // const visibleEvents = a.FindVisibleEvents();

      // if (a.Debug) console.log(visibleEvents);

      visibleEvents.forEach(function (e, i) {
        // Calculate Y position
        let posY = a.calcMarkerPosition(e.Position.X, startPosY);

        a.drawVerticalLine(e.Position.X, posY);
        const markerRectangle = a.drawMarker(e.Position.X, posY, e.BorderColour, e.BackColour);
        const labelSize = a.drawText((markerRectangle.X + markerRectangle.W + a.GraphRectangle.Margin), markerRectangle.Y, e.Label, a.Marker.Font, a.Marker.ForeColour, "left");

        e.Position = { X: e.Position.X, Y: posY };

        e.HitBox = {
          X: markerRectangle.X,
          Y: markerRectangle.Y,
          W: (markerRectangle.W + a.GraphRectangle.Margin + labelSize.Width + a.Marker.CollisionMargin),
          H: markerRectangle.H
        };

        if (a.Debug) a.drawRectangle(e.HitBox);
        if (a.Debug) console.log(e);
      });
    }

    if (a.Debug) a.drawRectangle(a.GraphRectangle);

  }


  GenerateEvent(date) {
    const a = this;

    return {
      Date: date,
      Label: "",
      Position: { X: 0, Y: 0 },
      Events: [],
      HitBox: null,
      BorderColour: a.Marker.BorderColour,
      BackColour: a.Marker.BackColour
    };
  }

  GenerateEventItem() {
    return {
      Title: "",
      Description: "",
      Link: "",
      Tag: null
    };
  }

  DateToString(date, pattern) {
    let result = pattern;

    result = result.replace("fffffff", date.getMilliseconds().toString().padStart(7, '0'));
    result = result.replace("ffffff", date.getMilliseconds().toString().padStart(6, '0'));
    result = result.replace("fffff", date.getMilliseconds().toString().padStart(5, '0'));
    result = result.replace("yyyy", date.getFullYear().toString().padStart(4, '0'));
    result = result.replace("MMMM", "{1}");
    result = result.replace("dddd", "{2}");
    result = result.replace("ffff", date.getMilliseconds().toString().padStart(4, '0'));
    result = result.replace("yyy", date.getFullYear().toString().padStart(3, '0'));
    result = result.replace("MMM", "{3}");
    result = result.replace("ddd", "{4}");
    result = result.replace("fff", date.getMilliseconds().toString().padStart(3, '0'));
    result = result.replace("zzz", "");
    result = result.replace("yy", date.getFullYear().toString().slice(-2));
    result = result.replace("MM", (date.getMonth() + 1).toString().padStart(2, '0'));
    result = result.replace("dd", date.getDate().toString().padStart(2, '0'));
    result = result.replace("HH", date.getHours().toString().padStart(2, '0'));
    result = result.replace("hh", (date.getHours() > 12 ? (date.getHours() - 12) : date.getHours()).toString().padStart(2, '0'));
    result = result.replace("mm", date.getMinutes().toString().padStart(2, '0'));
    result = result.replace("ss", date.getSeconds().toString().padStart(2, '0'));
    result = result.replace("ff", date.getMilliseconds().toString().padStart(2, '0'));
    result = result.replace("tt", "{5}");
    result = result.replace("zz", "");
    result = result.replace("y", date.getFullYear().toString());
    result = result.replace("M", (date.getMonth() + 1).toString());
    result = result.replace("d", date.getDate().toString());
    result = result.replace("H", date.getHours().toString());
    result = result.replace("h", (date.getHours() > 12 ? (date.getHours() - 12) : date.getHours()).toString());
    result = result.replace("m", date.getMinutes().toString());
    result = result.replace("s", date.getSeconds().toString());
    result = result.replace("z", "");
    result = result.replace("t", "{6}");
    result = result.replace("Z", "");

    result = result.replace("{1}", date.toLocaleString('default', { month: 'long' }));
    result = result.replace("{2}", date.toLocaleString('default', { weekday: 'long' }));
    result = result.replace("{3}", date.toLocaleString('default', { month: 'short' }));
    result = result.replace("{4}", date.toLocaleString('default', { weekday: 'short' }));
    result = result.replace("{5}", (date.getHours() >= 12 ? "PM" : "AM"));
    result = result.replace("{6}", (date.getHours() >= 12 ? "P" : "A"));

    return result;
  }

  OnMouseDown(sender, e, event) {
  }

  OnClick(sender, e, event) {
  }


  // calcGraphRectangle() {
  //   const a = this;

  //   // const xAxisHeight = a.calcXAxisHeight();

  //   // let result = {
  //   //   X: a.Padding.Left,
  //   //   Y: a.Padding.Top,
  //   //   W: (a.Size.W - (a.Padding.Left + a.Padding.Right)),
  //   //   H: (a.Size.H - (a.Padding.Top + a.Padding.Bottom) - xAxisHeight),
  //   //   Margin: (a.Marker.BorderWidth * 2)
  //   // };

  //   let result = {
  //     X: a.Padding.Left,
  //     Y: a.Padding.Top,
  //     W: (a.Size.W - (a.Padding.Left + a.Padding.Right)),
  //     H: (a.Size.H - (a.Padding.Top + a.Padding.Bottom)),
  //     Margin: (a.Marker.BorderWidth * 2)
  //   };

  //   result.StepHeight = a.Marker.Width + result.Margin;
  //   result.NoStep = Math.floor(result.H / result.StepHeight);

  //   return result;
  // }

  // calcXAxisHeight() {
  //   const a  = this;
  //   const labelSize = a.measureText(a.Axis.Font, "0");
  //   const result = labelSize.Height + a.Axis.LabelSpacing + (a.Axis.X.DayLineHeight * 2);

  //   return result;
  // }


  // calcMarkerPosition(x, y) {
  //   const a = this;

  //   // Calculate Y position
  //   let hasMoved = false;
  //   let posY = y;
  //   for (let i=0; i<a.GraphRectangle.NoStep; i++)
  //   {
  //     posY = y + (a.GraphRectangle.StepHeight * i);

  //     var clippedEvent = a.FindEventsByCoords(x, posY);
  //     if (clippedEvent == null) {
  //       hasMoved = true;
  //       break;
  //     }
  //   }

  //   if (!hasMoved) {
  //     posY = y;
  //   }

  //   return posY;
  // }

  // clearChart() {
  //   const a = this;
  //   const rect = {
  //     X: a.GraphRectangle.X,
  //     Y: a.GraphRectangle.Y,
  //     W: a.GraphRectangle.W,
  //     H: a.GraphRectangle.H
  //   };

  //   rect.X += a.Axis.LineWidth;
  //   rect.Y -= a.Padding.Top;
  //   rect.W -= a.Axis.LineWidth;
  //   rect.W += a.Padding.Right;
  //   rect.H -= a.Axis.LineWidth;
  //   rect.H += a.Padding.Top;

  //   a.ctx.clearRect(rect.X, rect.Y, rect.W, rect.H);

  //   if (a.Debug) a.drawRectangle(rect);

  //   // Clear marker positions
  //   const visibleEvents = a.FindVisibleEvents();
  //   visibleEvents.forEach(function (e, i) {
  //     e.Position = { X: 0, Y: 0 };
  //     e.HitBox = null;
  //   });
  // }

  // drawAxis() {
  //   const a = this;

  //   a.ctx.beginPath();
  //   a.ctx.moveTo(a.GraphRectangle.X, a.GraphRectangle.Y);
  //   a.ctx.lineTo(a.GraphRectangle.X, (a.GraphRectangle.H + a.GraphRectangle.Y));
  //   a.ctx.lineTo((a.GraphRectangle.W + a.GraphRectangle.X), (a.GraphRectangle.H + a.GraphRectangle.Y));
  //   a.ctx.lineWidth = a.Axis.LineWidth;
  //   a.ctx.strokeStyle = a.Axis.LineColour1;
  //   a.ctx.stroke();
  // }

  // drawXAxis() {
  //   const a = this;

  //   let startPosX = a.GraphRectangle.X;
  //   const endPosX = (a.GraphRectangle.X + a.GraphRectangle.W);
  //   const posY = (a.GraphRectangle.Y + a.GraphRectangle.H) + a.Axis.LineWidth;

  //   let i = 0;

  //   while (true) {
  //     if (startPosX >= endPosX) {
  //       break;
  //     }

  //     a.ctx.beginPath();
  //     a.ctx.moveTo(startPosX, posY);

  //     if ((i % a.Axis.X.NoPartPerDay) == 0) {
  //       a.ctx.lineTo(startPosX, (posY + a.Axis.X.DayLineHeight));
  //       a.ctx.strokeStyle = a.Axis.X.DayLineColour;
  //     } else {
  //       a.ctx.lineTo(startPosX, (posY + a.Axis.X.HourLineHeight));
  //       a.ctx.strokeStyle = a.Axis.X.HourLineColour;
  //     }

  //     a.ctx.lineWidth = a.Axis.LineWidth;
  //     a.ctx.stroke();

  //     startPosX += a.Axis.X.HourLineSpace;

  //     i++;
  //   }
  // }

  // drawXAxisLabels() {
  //   const a = this;

  //   const result = a.getXAxis();
  //   const posY = (a.GraphRectangle.Y + a.GraphRectangle.H) + a.Axis.LineWidth;

  //   result.forEach(function(e, i) {
  //     const date = a.ConvertToDate(e.Date);

  //     let writeLabel = false;
  //     if ((i == 0)) {
  //       // Don't label first entry if too close to the next month
  //       if (date.getDate() < 25) {
  //         writeLabel = true;
  //       }
  //     } else if (date.getDate() == 1) {
  //       writeLabel = true;
  //     }

  //     // if (i == 0) {
  //     //   return;
  //     // }

  //     const labelSize = a.drawText(e.X, (posY + a.Axis.X.DayLineHeight), a.DateToString(date, "dd"), a.Axis.Font, a.Axis.LabelColour, "center");

  //     // Write month on first of the month
  //     if (writeLabel) {
  //       a.drawText(e.X, (posY + a.Axis.X.DayLineHeight + labelSize.Height + a.Axis.LabelSpacing), a.DateToString(date, "MMMM yyyy"), a.Axis.Font, a.Axis.LabelColour, "left");
  //     }
  //   });
  // }

  // drawMarker(x, y, borderColour, backColour) {
  //   const a = this;
  //   const width = a.Marker.Width - (a.Marker.BorderWidth * 2);

  //   a.ctx.beginPath();
  //   a.ctx.arc(x, y, width, 0, 2 * Math.PI, false);
  //   a.ctx.fillStyle = backColour;
  //   a.ctx.fill();
  //   a.ctx.lineWidth = a.Marker.BorderWidth;
  //   a.ctx.strokeStyle = borderColour;
  //   a.ctx.stroke();

  //   return a.measureMarker(x, y);
  // }

  // drawText(x, y, label, font, foreColour, align) {
  //   const a = this;

  //   a.ctx.font = font;
  //   a.ctx.fillStyle = foreColour;

  //   const size = a.measureText(font, label);

  //   switch (align) {
  //     case "center":
  //       x = (x - size.OffsetLeft);
  //       break;
  //     case "right":
  //       x = (x - size.Width);
  //       break;
  //     case "left":
  //     default:
  //       // do nothing
  //       break;
  //   }

  //   a.ctx.fillText(label, x, (y + size.Height));

  //   return size;
  // }

  // drawRectangle(rectangle) {
  //   const a = this;

  //   a.ctx.beginPath();
  //   a.ctx.rect(rectangle.X, rectangle.Y, rectangle.W, rectangle.H);
  //   //a.ctx.fillStyle = 'yellow';
  //   //a.ctx.fill();
  //   a.ctx.lineWidth = 1;
  //   a.ctx.strokeStyle = 'red';
  //   a.ctx.stroke();
  // }

  // drawVerticalLine(x, y) {
  //   const a = this;
  //   const linePosY = (a.GraphRectangle.Y + a.GraphRectangle.H);

  //   if (y <= 0) {
  //     y = (a.GraphRectangle.Y + a.HighlightLine.Width);
  //   }

  //   a.ctx.beginPath();
  //   a.ctx.moveTo(x, y);
  //   a.ctx.lineTo(x, (linePosY - a.HighlightLine.Width));
  //   a.ctx.lineWidth = a.HighlightLine.Width;
  //   a.ctx.strokeStyle = a.HighlightLine.Colour;
  //   a.ctx.stroke();
  // }

  // getXAxis() {
  //   const a = this;
  //   const endPosX = (a.GraphRectangle.X + a.GraphRectangle.W);

  //   let result = [];
  //   let x = a.GraphRectangle.X;
  //   let date = a.ConvertToDate(a.ShowDate);

  //   // Rollback one day
  //   date.setDate(date.getDate() - 1);

  //   while (true) {
  //     if (x >= endPosX) {
  //       break;
  //     }

  //     result.push({
  //       Date: a.DateToString(date, a.DateParsePattern),
  //       X: x
  //     });

  //     x += (a.Axis.X.HourLineSpace * a.Axis.X.NoPartPerDay);
  //     date.setDate(date.getDate() + 1);
  //   }

  //   return result;
  // }

  // half(value) {
  //   return (value / 2);
  // }

  // measureMarker(x, y) {
  //   const a = this;
  //   const offset = a.half(a.Marker.Width);

  //   const result = {
  //     X: x - (offset + a.Marker.BorderWidth),
  //     Y: y - (offset + a.Marker.BorderWidth),
  //     W: (a.Marker.Width + (a.Marker.BorderWidth * 2)),
  //     H: (a.Marker.Width + (a.Marker.BorderWidth * 2))
  //   };

  //   return result;
  // }

  // measureText(font, value) {
  //   const a = this;

  //   a.ctx.font = font;
  //   const size = a.ctx.measureText(value);

  //   return {
  //     Width: size.width,
  //     Height: size.fontBoundingBoxAscent,
  //     OffsetLeft: a.half(size.width),
  //     OffsetTop: a.half(size.fontBoundingBoxAscent)
  //   };
  // }

  ConvertToDate(value) {
    return new Date(Date.parse(value));
  }




  initialiseComponents() {
    const a = this;

    a.Container.innerHTML = "<canvas></canvas><canvas></canvas><canvas></canvas>";

    const canvasList = a.Container.getElementsByTagName("canvas");

    a.Layer.Background = new BBTimelineBackgroundCanvas(a, canvasList[0]);
    a.Layer.Flourish = new BBTimelineCanvas(a, canvasList[1]);
    a.Layer.Markers = new BBTimelineForegroundCanvas(a, canvasList[2]);

  }

}