"""Architecture diagram, revealed in four chunks aligned to intro beats i1..i4."""
C = "\033[36m"; B = "\033[1m"; D = "\033[2m"; G = "\033[32m"; Y = "\033[33m"; R = "\033[0m"

CHUNKS = [
[
 f"  {B}{C}┌────────────────────────────────┐{R}",
 f"  {B}{C}│{R} Developer / process owner      {B}{C}│{R}   {D}\"change this config\"{R}",
 f"  {B}{C}└───────────────┬────────────────┘{R}",
 f"  {B}{C}                │{R}",
 f"  {B}{C}                ▼{R}",
 f"  {B}{C}┌────────────────────────────────┐{R}",
 f"  {B}{C}│{R} Business application on a VM   {B}{C}│{R}",
 f"  {B}{C}└───────────────┬────────────────┘{R}",
],
[
 f"  {D}                │ protected by{R}",
 f"  {D}                ▼{R}",
 f"  {B}{G}┌────────────────────────────────┐{R}        {D}┌───────────────────────────┐{R}",
 f"  {B}{G}│{R} Zerto continuous protection    {B}{G}│{R}   vs   {D}│ Nightly backup            │{R}",
 f"  {B}{G}│{R} {G}recovery point every few secs{R}  {B}{G}│{R}        {D}│ recovery point: hours old │{R}",
 f"  {B}{G}└────────────────────────────────┘{R}        {D}└───────────────────────────┘{R}",
],
[
 "",
 f"  {B}{Y}┌────────────────────────────────┐{R}",
 f"  {B}{Y}│{R} AI agent                       {B}{Y}│{R}  1. ask Zerto: is this protected?",
 f"  {B}{Y}│{R} authorised to make the change  {B}{Y}│{R}  2. tag a checkpoint in the journal",
 f"  {B}{Y}└────────────────────────────────┘{R}  3. make the change, and test it",
],
[
 "",
 f"                                       4. {B}broken, and the agent cannot fix it{R}",
 f"                                          recover the file, or the whole VM,",
 f"                                          {G}from the checkpoint taken at step 2{R}",
],
]


def frame(upto: int) -> str:
    """Everything revealed through chunk `upto` (1-based)."""
    out = ["\033[H\033[2J", f"  {B}{C}ZERTO AI REWIND{R}  {D}how it fits together{R}", ""]
    for chunk in CHUNKS[:upto]:
        out.extend(chunk)
    return "\n".join(out)