#set text(lang: "sl")
#import "@preview/fletcher:0.5.8" as fletcher: diagram, node, edge
#import fletcher.shapes: house, chevron, pill, hexagon

#diagram(debug: 1, node-stroke: 2pt, edge-stroke: 1pt,
    {
        let store = (1, 7)
        let (A, B, C, D, E, F, G) = ((2, 6), (2, 5), (2, 4), (2, 3), (2, 2), (2, 1), (2, 0))
        let (B1, B2) = ((3, 4.5), (3, 3.5))
        let (E1, E2, E3) = ((3, 1.5), (3, 0.5), (3, -0.5))
        let (Br1, Br2) = ((1, G.at(1)), (2.5, E2.at(1)))
        let (T1, T2) = ((1, E.at(1)), (1, B.at(1)))
        let refs = (3, 7)
        node(store, [Content addressable object store], width: 3cm)
        node(A, [A 16f299], shape: pill, name: <A>)
        node(B, [B 16f299], shape: pill)
        node(C, [C 16f299], shape: pill)
        node(D, [D 16f299], shape: pill)
        node(E, [E 16f299], shape: pill)
        node(F, [F 16f299], shape: pill)
        node(G, [16f299], shape: pill)
        // merged branch
        node(B1, [B1 16f299], shape: pill)
        node(B2, [B2 16f299], shape: pill)
        // unmerged branch
        node(E1, [E1 16f299], shape: pill)
        node(E2, [E2 16f299], shape: pill)
        node(E3, [E3 16f299], shape: pill, stroke: (dash: "dashed"))
        // branches
        node(Br1, [main], shape: hexagon, stroke: purple)
        node(Br2, [hotfix], shape: hexagon, stroke: purple)
        // tags
        node(T1, [v-1.0], shape: chevron, stroke: green)
        node(T2, [v-1.1], shape: chevron, stroke: green)
        // refs
        node(refs, stroke: none, snap: false, enclose: (refs, (refs.at(0)+2, refs.at(0)+2)), 
            table(columns: 1, align: left,  [*References* (`.git/refs`)], [*Tags* (`.git/refs/tags`)\ `tag-1`: `8dd6d4b...`], [*Branches* (`.git/refs/heads`) \ `main`: `8dd6d4b...`\
            `feature-1`: `8dd6d4b...`\
            `hotfix`: `8dd6d4b...`])
        )
        let branches = (2, -2)
        node(branches, [#text(stroke: purple.darken(50%))[BRANCH]\ reference that moves when commiting canges], 
        stroke: 0.5pt, corner-radius: 10pt, inset: 0pt,  width: 1cm,  enclose: ((2, -2), (3, -2)))
        let tags = (0, 3.5)
        node(tags, [#text(stroke: green.darken(50%))[TAG]\ reference that don't move], 
        stroke: 0.5pt, corner-radius: 10pt, inset: 0pt,  width: 1cm,  enclose: ((0, 3.5), (1, 4.5)))
        let commit = (3.5, 2.5)
        node(commit, [
            *COMMIT*\ snapshot of filesystem tree in object store\
            #rect[
        ```
tree 65c47fee...
parent 16f299...
author MV <mv@ex...
committer MV <mv...

Add bar.txt
        ```]
        ], width:5cm, stroke: 0.5pt, corner-radius: 10pt)
        node((2, 7), [*Version history*\ 
                      #text(size: 0.6em)[ 
                      Commits are nodes in _Directed Acyclic Graph (DAG)_ that describes version history
        ]], width: 4cm)
        // history
        edge(B, A, "->")
        edge(C, B, "->")
        edge(D, C, "->")
        edge(E, D, "->")
        edge(F, E, "->")
        edge(G, F, "->")
        // merged branch
        edge(B1, B, "->", layer: 1)
        edge(B2, B1, "->")
        edge(D, B2, "->")
        // unmerged branch
        edge(E1, E, "->")
        edge(E2, E1, "->")
        edge(E3, E2, "->", stroke: (dash: "dashed"))
        // refs
        edge(Br1, G)
        edge(Br2, E2)
        edge(T1, E)
        edge(T2, B)
        edge(Br1, branches, stroke: 0.5pt)
        edge(Br2, branches, stroke: 0.5pt)
        edge(T1, tags, stroke: 0.5pt)
        edge(T2, tags, stroke: 0.5pt)
        edge(commit, E, stroke: 0.5pt)
    }
)