digraph dataflow {
  rankdir=TB;
  pad="0.3";
  fontname="Helvetica";
  node [fontname="Helvetica", fontsize=12, margin="0.15,0.1"];
  edge [fontname="Helvetica", fontsize=10];

  labelloc="t";
  label="Deck in a Dash — dataflow for one reading";
  fontsize=16;

  node [shape=box, style="rounded,filled"];

  subgraph cluster_inputs {
    label="Inputs (two equivalent entry points)"; style=dashed; color=gray40; fontsize=11;
    cli    [label="Direct CLI flags\n--seed --birth-* --date --format", fillcolor="#e3e3e3"];
    runsh  [label="run.sh:\nOS clock  ->  seed + --date\nuser.properties  ->  birth-*", fillcolor="#e3e3e3"];
  }

  main [label="main.c\nparses args into:\nseed (string), BirthData, utc_moment", fillcolor="#cfe8fb"];

  reading_generate [label="reading_generate()\nreading.c", shape=box, style="rounded,filled", fillcolor="#9fd3f5", peripheries=2];

  natal_fn   [label="astro_compute_natal_chart()\nastro.c", fillcolor="#cfe8fb"];
  transit_fn [label="astro_compute_daily_transits()\nastro.c", fillcolor="#cfe8fb"];
  tarot_fn   [label="tarot_draw_celtic_cross()\ntarot.c", fillcolor="#cfe8fb"];

  natal_data   [label="NatalChart\nbodies[10]: sign + degree\nascendant_longitude\nhouses[12]  (whole-sign)", shape=note, fillcolor="#fdf3d0"];
  transit_data [label="DailyTransits\nbodies[10]\nmoon_phase\naspects[]: transiting/natal\nplanet, type, orb", shape=note, fillcolor="#fdf3d0"];
  spread_data  [label="CelticCrossSpread\npositions[10]: card, reversed", shape=note, fillcolor="#fdf3d0"];

  daily_reading [label="DailyReading\n{ natal, transits, spread }", shape=note, fillcolor="#fbe3c8", peripheries=2];

  print_text [label="reading_print_text()", fillcolor="#cfe8fb"];
  print_html [label="reading_print_html()", fillcolor="#cfe8fb"];
  watch_fn   [label="watchapp UI code\n(future — walks the struct\ndirectly, no print_* call)", fillcolor=white, color=firebrick, fontcolor=firebrick, style="rounded,dashed"];

  out_text [label="stdout: plain-text report", shape=parallelogram, fillcolor="#c8f0c8"];
  out_html [label="stdout: reading.html\n(<img src=\"img/...\"> per card)", shape=parallelogram, fillcolor="#c8f0c8"];
  out_watch [label="watch screens\n(future)", shape=parallelogram, fillcolor=white, color=firebrick, fontcolor=firebrick, style="dashed"];

  cli -> main;
  runsh -> main;
  main -> reading_generate [label="seed, birth,\nutc_moment"];

  reading_generate -> natal_fn [label="birth"];
  natal_fn -> natal_data;

  reading_generate -> transit_fn [label="utc_moment,\nNatalChart"];
  natal_data -> transit_fn [style=dotted, color=gray40, label="natal chart\nread-only"];
  transit_fn -> transit_data;

  reading_generate -> tarot_fn [label="seed"];
  tarot_fn -> spread_data;

  natal_data -> daily_reading;
  transit_data -> daily_reading;
  spread_data -> daily_reading;

  daily_reading -> print_text;
  daily_reading -> print_html;
  daily_reading -> watch_fn [style=dashed, color=firebrick];

  print_text -> out_text;
  print_html -> out_html;
  watch_fn -> out_watch [style=dashed, color=firebrick];
}