### A Pluto.jl notebook ###
# v0.19.40

using Markdown
using InteractiveUtils

# This Pluto notebook uses @bind for interactivity. The macro is defined locally
# so the file remains a valid standalone Julia script when Pluto isn't running.
macro bind(def, element)
    #= none:1 =# quote
        local iv = try
            Base.loaded_modules[Base.PkgId(Base.UUID("6e696c72-6542-2067-7265-42206c756150"), "AbstractPlutoDingetjes")].Bonds.initial_value
        catch
            b -> missing
        end
        local el = $(esc(element))
        global $(esc(def)) = Core.applicable(Base.get, el) ? Base.get(el) : iv(el)
        el
    end
end

# ╔═╡ 9d14e486-1faa-45a9-b235-6367a039f9da
begin
    using Pkg
    Pkg.activate(@__DIR__)
    using JSON
    using PlutoUI
    using Plots
    using MAT
    gr()
end

# ╔═╡ 08e80248-89fe-4639-b55c-f10d96de6c31
md"""
# 🦎 Predicate Explorer

> *Hybrid-systems extension to FRET — the bridge between boolean predicates
>  and continuous-state halfspaces.*

This notebook is the visual companion to `reachability/predicates.json`.
Each FRET-spec predicate (a boolean condition over named variables) maps to a
**numerical halfspace** over the 10-state continuous vector
``x = [n,\, C_1, \ldots, C_6,\, T_f,\, T_c,\, T_{\mathrm{cold}}]``.

Use it to:
- Inspect what each predicate *physically means*.
- See how mode invariants compose from named safety limits.
- Trace which reach artifact has tried to discharge each obligation.
- Sketch edits in a UI that mirrors the JSON structure (read-only v1 — edits
  do not persist).

The data behind everything below is `../reachability/predicates.json`.
Edit the JSON, restart this notebook, results re-render.
"""

# ╔═╡ d7cadb58-e7c4-4701-8fcb-380f1e948d42
md"""
## 1 · Source of truth — load `predicates.json`
"""

# ╔═╡ c995a73a-c07e-415b-abe8-57abaf9f4b46
begin
    pred_path = joinpath(@__DIR__, "..", "reachability", "predicates.json")
    pred_raw  = JSON.parsefile(pred_path)
    md"Loaded `$(relpath(pred_path))`. Top-level keys: $(join(sort(collect(keys(pred_raw))), ", "))."
end

# ╔═╡ 48f4bec1-ac48-4318-ba6e-92dbf80a7b2d
md"""
## 2 · Plant-derived constants

These are computed once from `pke_params()` (the plant model in `../code/`)
and used as the basis for every halfspace.

| Symbol | Meaning | Value |
|---|---|---|
| `T_c0` | Operating-point average coolant T | $(round(308.349; digits=2)) °C |
| `T_f0` | Operating-point fuel T | $(round(328.349; digits=2)) °C |
| `T_cold0` | Operating-point cold-leg T | 290.00 °C |
| `T_standby` | Hot-standby T | $(round(308.349 + pred_raw["derived"]["T_standby_offset_C"]; digits=2)) °C |

Hot standby is defined as `T_c0 - 60 °F = T_c0 - 33.33 °C`. Source-of-truth
constants live under the `derived` key in the JSON.
"""

# ╔═╡ 7ec2cd9d-5c5c-47d7-aa3c-189091b97204
md"""
## 3 · Operational deadbands

Soft bands used by the **DRC** to switch modes. These are *not* safety
properties — violating them triggers a mode change or operator alert,
not damage.

| Predicate | Meaning |
|---|---|
$(join(["| `$name` | $(get(entry, "meaning", "")) |" for (name, entry) in pred_raw["operational_deadbands"] if !startswith(name, "_")], "\n"))
"""

# ╔═╡ e99c4c2b-7d29-49a4-a474-047f204e331f
md"""
### Concretization of `t_avg_in_range`

> *"Average coolant in tight operating band — used for heatup → operation transition."*

In FRET this is the boolean predicate `t_avg_in_range`. In the continuous
state space it concretizes to the box

```
T_c0 - 2.778 ≤ T_c ≤ T_c0 + 2.778   (°C)
```

Halfwidth = 2.778 °C ≈ 5 °F (typical PWR T_avg deadband). The two halfspace
rows live as `state_index = 9` (which is `T_c`) with coefficients ±1 and the
appropriate offset.
"""

# ╔═╡ 408432c8-2cc6-4505-8623-9f5614a72c4d
md"""
## 4 · Safety limits — the hard constraints

These are **one-sided halfspaces** corresponding to physical damage mechanisms
or reactor-trip setpoints. Asymmetric: the plant is not equally vulnerable on
both sides of the setpoint. These are what reach analyses target.
"""

# ╔═╡ 0ef6cd25-7f9c-4d64-afdb-ffe8af1ac967
begin
    safety_rows = []
    for (name, entry) in pred_raw["safety_limits"]
        startswith(name, "_") && continue
        meaning = get(entry, "meaning", "")
        concret = get(entry, "concretization", "")
        push!(safety_rows, (name=name, meaning=meaning, concretization=concret))
    end
    md_table = "| Limit | What it protects | Concretization |\n|---|---|---|\n"
    for r in safety_rows
        md_table *= "| `$(r.name)` | $(r.meaning) | `$(r.concretization)` |\n"
    end
    Markdown.parse(md_table)
end

# ╔═╡ 68b1c7bf-c498-41a9-a435-1332c8154035
md"""
## 5 · Mode invariants — conjunctions of safety limits

`inv1_holds` (heatup) and `inv2_holds` (operation) are safety envelopes,
declared as a conjunction of named entries from the safety-limits group.
Changing a limit propagates automatically.
"""

# ╔═╡ 06be0c87-2a28-4ab3-9fa1-ccde3a9b70d9
begin
    function render_invariant(name)
        haskey(pred_raw["mode_invariants"], name) || return md"_(not present)_"
        entry = pred_raw["mode_invariants"][name]
        components = entry["conjunction_of"]
        components = isa(components, String) ? [components] : components
        comp_md = join(["- `$c`" for c in components], "\n")
        Markdown.parse(
            "**`$name`**: $(get(entry, "meaning", ""))\n\nConjunction of:\n\n$comp_md\n"
        )
    end
    render_invariant("inv1_holds")
end

# ╔═╡ 8a24ff1e-0afb-4707-89d7-fa50e3b74dbd
render_invariant("inv2_holds")

# ╔═╡ e67f3259-ce97-4bf5-9e63-8f3aef7c6c56
md"""
## 6 · Mode boundaries — entry / safe / exit / time

For each DRC mode, the reach-analysis triple: where does state start, where
must it stay, where must it land, by when. **Equilibrium modes** have no
T_max (forever-invariance is the obligation). **Transition modes** have
both T_min and T_max (reach-avoid is the obligation).
"""

# ╔═╡ a17586e3-b8f5-4608-950b-69ae45edd6b8
begin
    mb = pred_raw["mode_boundaries"]
    function render_mode(name)
        haskey(mb, name) || return md"_(not present)_"
        m = mb[name]
        kind = get(m, "kind", "?")
        oblig = get(m, "obligation", "?")
        Tmax = get(m, "T_max_seconds", nothing)
        Tmin = get(m, "T_min_seconds", nothing)
        time_md = if Tmax === nothing
            "_(equilibrium mode — no time bound)_"
        else
            tmax_str = "$(round(Tmax / 60; digits=1)) min ($(Tmax) s)"
            tmin_str = Tmin === nothing ? "_unconstrained_" : "$(round(Tmin / 60; digits=1)) min ($(Tmin) s)"
            "T_min: $(tmin_str)  ·  T_max: $(tmax_str)"
        end
        x_entry = if haskey(m, "X_entry_polytope") && isa(m["X_entry_polytope"], AbstractDict)
            ranges = []
            for (k, v) in m["X_entry_polytope"]
                isa(v, Vector) && length(v) == 2 || continue
                push!(ranges, "  - `$k`: [$(v[1]), $(v[2])]")
            end
            join(ranges, "\n")
        else
            "_(non-polytope or referenced — see JSON)_"
        end
        x_safe = get(m, "X_safe_predicate", "?")
        x_exit = get(m, "X_exit_predicate", "?")
        Markdown.parse("""
        **`$name`** ($(kind))

        $oblig

        **X_entry:**
        $x_entry

        **X_safe:** `$x_safe`

        **X_exit:** `$x_exit`

        **Time:** $time_md
        """)
    end
    render_mode("q_shutdown")
end

# ╔═╡ dc8758ad-904c-4917-9fba-9a3e42e05e34
render_mode("q_heatup")

# ╔═╡ 60bd9d1d-9a04-48e3-a3c9-a84b8bc91009
render_mode("q_operation")

# ╔═╡ 561c3d22-4d11-4511-90b7-63b77829454b
render_mode("q_scram")

# ╔═╡ f50515e2-b205-45ed-acc9-9790697345f8
md"""
## 7 · Visualization — `t_avg_in_range` × `n_high_trip` projection

A 2D slice through state space showing the operational deadband on `T_c`
(blue band) inside the high-flux trip on `n` (red ceiling). The intersection
is the comfortable operating polytope — where reach tubes should live.
"""

# ╔═╡ 015fa1f4-9813-4ede-ad42-8b4f2340bbb8
begin
    T_c0 = 308.349
    Tc_lo = T_c0 - 2.778
    Tc_hi = T_c0 + 2.778
    n_high = 1.15
    n_low  = 0.15
    p = plot(xlabel="T_avg [°C]", ylabel="n",
             xlim=(280, 322), ylim=(-0.1, 1.4),
             title="Operating polytope (intersection of t_avg_in_range × n bounds)",
             size=(700, 450), legend=:topleft)
    # Operating box
    plot!(p, [Tc_lo, Tc_hi, Tc_hi, Tc_lo, Tc_lo],
             [n_low, n_low, n_high, n_high, n_low],
             linewidth=2, color=:green, label="t_avg_in_range × n bounds")
    # Trip lines
    hline!(p, [n_high], ls=:dash, color=:red, label="n_high_trip = 1.15")
    hline!(p, [n_low],  ls=:dash, color=:red, label="n_low_operation = 0.15")
    vline!(p, [Tc_lo, Tc_hi], ls=:dot, color=:blue, label="t_avg_in_range ± 2.78 °C")
    scatter!(p, [T_c0], [1.0], color=:black, markersize=8, label="x_op (operating point)")
end

# ╔═╡ 210a3da2-6a5d-48b2-a48e-d87132d5a32f
md"""
## 8 · Edit panel (UX preview — does not persist)

This panel shows what live editing would look like. **Sliders below do not
write back to `predicates.json`** in v1. Use it to feel out the workflow;
file an issue if a key knob is missing.
"""

# ╔═╡ 3770e247-c2bd-41a1-9470-0f145f73a894
@bind ui_t_avg_halfwidth Slider(0.5:0.25:8.0, default=2.78, show_value=true)

# ╔═╡ 8c67770b-58f8-4868-a3e2-53620565ab5d
@bind ui_n_high_trip Slider(1.05:0.01:1.30, default=1.15, show_value=true)

# ╔═╡ f88f6809-ad3e-4696-bb12-ad8c30d66a9a
@bind ui_t_standby_offset_F Slider(-90.0:5.0:-30.0, default=-60.0, show_value=true)

# ╔═╡ b7fdf92d-948b-41f2-8516-dd8fc20c2efe
md"""
**Sketched changes (preview only):**

- `t_avg_in_range_halfwidth`: $(ui_t_avg_halfwidth) °C  (current JSON: 2.778)
- `n_high_trip`: $(ui_n_high_trip)  (current JSON: 1.15)
- `T_standby` offset from T_c0: $(ui_t_standby_offset_F) °F (current JSON: -60.0)

To apply, edit `../reachability/predicates.json` directly. (Write access
will land in app v2.)
"""

# ╔═╡ 0560c66a-c12f-4f15-bc49-2c9c8164abd1
md"""
## 9 · Reach traceability

Which reach artifact has covered which mode invariant? Manual map for now —
later versions will pull this from the latest reach-result `.mat` files.
"""

# ╔═╡ 1f6abf31-3618-46a5-9f57-4cb3c8022f89
md"""
| Mode | Invariant | Reach status | Artifact |
|---|---|---|---|
| `q_operation` | `inv2_holds` | ✅ all 6 halfspaces pass (linear, approximate) | `code/scripts/reach_operation.jl` |
| `q_operation` | `inv2_holds` | ❌ Lyapunov barrier fails all 6 (anisotropy) | `code/scripts/barrier_lyapunov.jl` |
| `q_heatup` | `inv1_holds` | ⚠️ TMJets nonlinear works to 10s only (stiffness) | `code/scripts/reach_heatup_nonlinear.jl` |
| `q_heatup` | `inv1_holds` | ❌ no linear reach (time-varying ref needs LTV) | — |
| `q_scram` | (TBD) | ❌ not started | — |
| `q_shutdown` | (TBD) | ❌ not started (trivial — constant u) | — |
"""

# ╔═╡ a74106fb-d501-428a-a02e-41f55b49b3da
md"""
## 9b · Live reach result ingestion

If `code/scripts/reach_operation.jl` has been run, `reach_operation_result.mat`
exists in `../reachability/`.  Load it and show per-halfspace margins live —
no more hand-maintained traceability table.
"""

# ╔═╡ 37d6b212-9f00-4684-9f91-50c7e17cbd62
begin
    reach_mat_path = joinpath(@__DIR__, "..", "results", "reach_operation_result.mat")
    have_reach_mat = isfile(reach_mat_path)
    if have_reach_mat
        reach_mat = matread(reach_mat_path)
        md"""**Loaded** `reach_operation_result.mat` — keys: $(join(sort(collect(keys(reach_mat))), ", "))."""
    else
        md"""_(no `reach_operation_result.mat` found — run `cd code && julia --project=. scripts/reach_operation.jl`)_"""
    end
end

# ╔═╡ df53126a-1efa-4cc7-87f4-be4ff0808513
begin
    inv2_haspath = haskey(pred_raw["mode_invariants"], "inv2_holds")
    if have_reach_mat && inv2_haspath
        # Reconstruct per-halfspace margins from the loaded reach tube.
        T_op_const  = 308.349
        T_f0_const  = 328.349
        Tcold0_const = 290.0
        Tstandby_local = T_op_const + pred_raw["derived"]["T_standby_offset_C"]
        eval_local(expr) = let T_c0=T_op_const, T_f0=T_f0_const, T_cold0=Tcold0_const, T_standby=Tstandby_local
            eval(Meta.parse(expr))
        end

        # Build A_inv, b_inv from JSON for inv2_holds (same logic as load_predicates).
        inv2_entry = pred_raw["mode_invariants"]["inv2_holds"]
        components = inv2_entry["conjunction_of"]
        A_inv = zeros(0, 10)
        b_inv = zeros(0)
        labels = String[]
        for comp in components
            entry = pred_raw["safety_limits"][comp]
            for hs in entry["halfspaces"]
                row = zeros(1, 10)
                if haskey(hs, "row")
                    for pair in hs["row"]
                        row[1, Int(pair[1])] = Float64(pair[2])
                    end
                else
                    row[1, Int(hs["state_index"])] = Float64(hs["coeff"])
                end
                A_inv = vcat(A_inv, row)
                b = eval_local(hs["rhs_expr"])
                b_inv = vcat(b_inv, b)
                push!(labels, comp)
            end
        end

        X_lo_mat = reach_mat["X_lo"]
        X_hi_mat = reach_mat["X_hi"]

        rows = String[]
        push!(rows, "| Safety halfspace | Limit | Reach max | Margin | |")
        push!(rows, "|---|---:|---:|---:|---|")
        for k in 1:size(A_inv, 1)
            a = A_inv[k, :]
            env = (a .> 0) .* X_hi_mat .+ (a .< 0) .* X_lo_mat
            zero_mask = (a .== 0)
            env[zero_mask, :] .= X_hi_mat[zero_mask, :]
            max_ax = maximum(a' * env)
            margin = b_inv[k] - max_ax
            badge  = margin >= 0 ? "✅" : "❌"
            push!(rows, "| `$(labels[k])` | $(round(b_inv[k]; digits=3)) | $(round(max_ax; digits=3)) | $(round(margin; digits=3)) | $badge |")
        end
        Markdown.parse(join(rows, "\n"))
    else
        md"_(reach result or inv2_holds unavailable; cannot render live margins)_"
    end
end

# ╔═╡ 9bd8d609-ffa4-46a7-8f0f-d093d87e45e9
md"""
## 9c · 2D projection chooser

Pick any two state coordinates; render the operating polytope inside the
safety limits, with the reach tube envelope overlaid (if loaded).
"""

# ╔═╡ e4d56600-7a46-46a1-a7c9-f65a5db95f66
@bind proj_x Select(["n", "T_f", "T_c", "T_cold"], default="T_c")

# ╔═╡ 4fdf70de-3f58-4a38-917b-62b3689ce534
@bind proj_y Select(["n", "T_f", "T_c", "T_cold"], default="n")

# ╔═╡ 37251c95-dd46-402f-9579-d4ede2c1e5ff
begin
    state_idx = Dict("n"=>1, "T_f"=>8, "T_c"=>9, "T_cold"=>10)
    state_units = Dict("n"=>"", "T_f"=>" [°C]", "T_c"=>" [°C]", "T_cold"=>" [°C]")

    px_idx = state_idx[proj_x]
    py_idx = state_idx[proj_y]

    # Determine reasonable axis ranges from operating point + 5% margins.
    x_op_demo = [1.0,
                 173.4, 467.0, 114.8, 85.3, 6.56, 0.91,
                 328.35, 308.35, 290.0]
    px_op = x_op_demo[px_idx]
    py_op = x_op_demo[py_idx]
    px_span = max(0.2 * abs(px_op), 5.0)
    py_span = max(0.2 * abs(py_op), 5.0)

    p_proj = plot(xlim=(px_op - px_span, px_op + px_span),
                  ylim=(py_op - py_span, py_op + py_span),
                  xlabel=proj_x * state_units[proj_x],
                  ylabel=proj_y * state_units[proj_y],
                  title="Projection: $proj_y vs $proj_x",
                  size=(700, 450), legend=:topleft)

    # Overlay reach tube envelope as a rectangle.
    if have_reach_mat
        X_lo_local = reach_mat["X_lo"]
        X_hi_local = reach_mat["X_hi"]
        rx_lo = minimum(X_lo_local[px_idx, :])
        rx_hi = maximum(X_hi_local[px_idx, :])
        ry_lo = minimum(X_lo_local[py_idx, :])
        ry_hi = maximum(X_hi_local[py_idx, :])
        plot!(p_proj, [rx_lo, rx_hi, rx_hi, rx_lo, rx_lo],
                      [ry_lo, ry_lo, ry_hi, ry_hi, ry_lo],
                      lw=2, color=:red, label="reach tube envelope")
    end

    # Operating point.
    scatter!(p_proj, [px_op], [py_op], color=:black, markersize=8,
             label="x_op")
    p_proj
end

# ╔═╡ 4d8459c1-a937-4b53-9eca-975261d6a2cd
md"""
## 9d · Prompt-jump heatup reach (if available)

If `code/scripts/reach_heatup_pj.jl` has been run, the latest result
shows up here as a T_c reach envelope vs time.

This is the singular-perturbation reduction that lets nonlinear reach
extend past the ~10 s prompt-neutron stiffness wall.
"""

# ╔═╡ 45e8962a-873e-48d3-aac4-70ea0cf36c97
begin
    pj_mat_path = joinpath(@__DIR__, "..", "results", "reach_heatup_pj_result.mat")
    if isfile(pj_mat_path)
        pj_mat = matread(pj_mat_path)
        md"""**Loaded** `reach_heatup_pj_result.mat` — pending plot rendering."""
    else
        md"""_(no `reach_heatup_pj_result.mat` yet — run `cd code && julia --project=. scripts/reach_heatup_pj.jl`)_"""
    end
end

# ╔═╡ de922a70-b653-4b2c-bb13-ccc14b14ac91
md"""
## 10 · Notes for the next pass

- v2 should add **write-back** to `predicates.json` (slider → JSON).
- v3: **derive** halfspace concretizations directly from the FRET spec
  + a structured vocabulary of physical bounds. The dream FRET-extension
  feature.
- Hooks into the latest reach-result MAT files, parsed and shown
  per-halfspace.
- 2D projection chooser (currently fixed to T_c × n).
- Mode-transition graph rendered live from `mode_boundaries`.

---

*"Looks ordinary on the surface but is something else underneath."* 🦎
"""

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