@startuml
!includeurl https://raw.githubusercontent.com/plantuml-stdlib/C4-PlantUML/ce5a3ea16aee1b07487f9960633057d102b626a6/C4_Container.puml
skinparam WrapWidth 80
skinparam ranksep 10
skinparam dpi 200

LAYOUT_LANDSCAPE()
HIDE_STEREOTYPE()

skinparam rectangle {
   BorderColor<<diagram>> transparent
   BackgroundColor<<diagram>> transparent
}
sprite slicing slicing.png

Boundary(input, "**1) Process Input Files**") {
  Boundary(simple, "Read Simple Sources", "Natural Earth & Shapefiles") {
    System(sr, "Reader")
  }

  Boundary(osm, "Read OpenStreetMap Data", ".osm.pbf files") {
    System(profile2, "Profile")
    Boundary(pass1, "pass 1") {
      System(osm1n, "Nodes")
      System(osm1w, "Ways")
      System(osm1r, "Relations")
      ' enforce ordering
      osm1r -[hidden]> osm1w
      osm1w -[hidden]> osm1n
    }
    BiRel_Up(osm1r, profile2, " ")
    SystemDb(osmnl, "Node locations")
    SystemDb(osmmem, "Relation Members")
    SystemDb(osmmp, "Multipolygon geometries")
    SystemDb(osmrl, "Relation Info")
    Boundary(pass2, "pass 2") {
      System(osm2n, "Nodes")
      System(osm2w, "Ways")
      System(osm2r, "Relations")
      ' enforce ordering
      osm2r -[hidden]> osm2w
      osm2w -[hidden]> osm2n
    }
    Rel(osm1n, osmnl, " ")
    Rel(osm1r, osmmem, " ")
    Rel(osm1r, osmrl, " ")

    Rel(osmnl, osm2w, " ")
    Rel(osmmem, osm2w, " ")
    Rel(osmrl, osm2w, " ")
    Rel_Left(osm2w, osmmp, " ")
    Rel(osmmp, osm2r, " ")
  }

  Boundary(workers, "Process Workers", "1 per core") {
    System(profile, "Profile")
    System(render, "Render Vector Tile Features")
  }

  ' slicing diagram
  rectangle "<$slicing{scale=0.5}>" as slicing <<diagram>>
  slicing -[hidden]> render

  System(writer, "Writer")

  Rel(sr, profile, " ")
  Rel(osm2n, profile, " ")
  Rel(osm2w, profile, " ")
  Rel(osm2r, profile, " ")

  Rel(profile, render, " ")
  Rel(render, writer, " ")
}

Boundary(sort, "**2) Sort Features**") {
    SystemDb(fc1, "Chunk")
    SystemDb(fc2, "Chunk")
    SystemDb(fc3, "Chunk")
    ' enforce ordering
    fc1 -[hidden]> fc2
    fc2 -[hidden]> fc3
    System(sorters, "Sort Workers\n1 per core")
    BiRel_Up(fc3, sorters, " ")
}

Rel(writer, fc1, " ")
Rel(writer, fc2, " ")
Rel(writer, fc3, " ")

Boundary(mbtiles, "**3) Emit Vector Tiles**") {
    System(mbtread, "Read Features\nand group into tiles")
    System(mbtprocess, "Encode & gzip\n1 worker per core")
    System(mbtwriter, "Batched Writer")
}

SystemDb(mbtilesdb, "MBTiles", "x,y,z,data")

Rel(fc1, mbtread, " ")
Rel(fc2, mbtread, " ")
Rel(fc3, mbtread, " ")
Rel(mbtread, mbtprocess, " ")
Rel(mbtprocess, mbtwriter, " ")
Rel(mbtwriter, mbtilesdb, " ")


@enduml