import Mathlib
import OAI.Computability.DirectedFeedback.Machines.MachineExpanderFamilyTapes

namespace OAI

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namespace DFVSGames.Foundations.Complexity.MachineExpanderRow

open Turing
open PCP.ExpanderTables PCP.ExpanderRowControl PCP.ExpanderTableWords
open MachineComposition

def lookupPhaseLabel {d : Nat} (second : Bool)
    (l : MachinePreservingLookupClean.Label) : Label d :=
  if second then .secondLookup l else .firstLookup l

def scanPhaseLabel {d : Nat} (second : Bool) : Label d :=
  if second then .secondScan else .firstScan

def reversePhaseLabel {d : Nat} (second : Bool) : Label d :=
  if second then .secondReverse else .firstReverse

def lookupPhasePort {d : Nat} (second : Bool) (control : Control d) : Fin (degree d) :=
  if second then secondOffset control else firstOffset control

def lookupPhaseAddress {d : Nat} (second : Bool) (vertex : Nat) (control : Control d) : Nat :=
  if second then secondAddress vertex control else firstAddress vertex control

theorem lookupPhaseAddress_eq_rowIndex {v d : Nat} (second : Bool)
    (vertex : Fin v) (control : Control d) :
    lookupPhaseAddress second vertex.val control =
      (rowIndex v (degree d) (vertex, lookupPhasePort second control)).val := by
  cases second
  · exact firstAddress_eq_rowIndex vertex control
  · exact secondAddress_eq_rowIndex vertex control

theorem lookupTape_injective : Function.Injective lookupTape := by decide

variable {K Λ ρ : Type} [DecidableEq K] [Fintype ρ]

def lookupResultTapes (ports : Tape → K) (base : K → List Bool)
    (value : Nat) (indexSuffix : List Bool) : K → List Bool :=
  MachinePreservingLookup.initialTapes (ports ∘ lookupTape) base 0 indexSuffix []
    (encodeWord value ++ base (ports .lookupOutput))

theorem lookupResultTapes_index (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) (value : Nat) (indexSuffix : List Bool) :
    lookupResultTapes ports base value indexSuffix (ports .queryIndex) =
      encodeWord 0 ++ indexSuffix := by
  apply MachineLookup.tapes_index
  · exact fun h => (by decide : Tape.queryIndex ≠ .lookupWork) (distinct h)
  · exact fun h => (by decide : Tape.queryIndex ≠ .lookupOutput) (distinct h)

theorem lookupResultTapes_work (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) (value : Nat) (indexSuffix : List Bool) :
    lookupResultTapes ports base value indexSuffix (ports .lookupWork) = [] := by
  apply MachineLookup.tapes_source
  exact fun h => (by decide : Tape.lookupWork ≠ .lookupOutput) (distinct h)

theorem lookupResultTapes_output (ports : Tape → K)
    (base : K → List Bool) (value : Nat) (indexSuffix : List Bool) :
    lookupResultTapes ports base value indexSuffix (ports .lookupOutput) =
      encodeWord value ++ base (ports .lookupOutput) := by
  apply MachineLookup.tapes_destination

theorem lookupResultTapes_other (ports : Tape → K) (base : K → List Bool)
    (value : Nat) (indexSuffix : List Bool) (p : K)
    (hi : p ≠ ports .queryIndex) (hw : p ≠ ports .lookupWork)
    (ho : p ≠ ports .lookupOutput) :
    lookupResultTapes ports base value indexSuffix p = base p := by
  exact MachineLookup.tapes_other _ _ _ p hi hw ho _ _ _ _

theorem lookupResultTapes_table (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) (value : Nat) (indexSuffix : List Bool) :
    lookupResultTapes ports base value indexSuffix (ports .table) = base (ports .table) := by
  apply lookupResultTapes_other
  all_goals intro h; have := distinct h; cases this

theorem lookupResultTapes_restore (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) (value : Nat) (indexSuffix : List Bool) :
    lookupResultTapes ports base value indexSuffix (ports .lookupRestore) =
      base (ports .lookupRestore) := by
  apply lookupResultTapes_other
  all_goals intro h; have := distinct h; cases this

section Lookup

variable {v d : Nat} (second : Bool) (positive : 0 < d)
    (H : Table (cloudSize d) d) (ports : Tape → K)
    (distinct : Function.Injective ports) (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ l, target (labels l) = statement positive H ports labels exit l)
    (base : K → List Bool) (G : Table v (degree d))
    (tableWord : base (ports .table) = encodeWords (rotationWords G))
    (scratchEmpty : base (ports .lookupRestore) = [])
    (x : Fin v × Fin (degree d)) (indexSuffix : List Bool)
    (counterWord : base (ports .queryIndex) =
      encodeWord (rowIndex v (degree d) x).val ++ indexSuffix)
    (workEmpty : base (ports .lookupWork) = [])
    (ambient : (Ambient ρ d × Fin (degree d)) × Unit) (register : Option Bool)

include positive H distinct exit code tableWord scratchEmpty counterWord workEmpty

theorem lookupPhaseTrace :
    (advance (TM2.step target))^[MachinePreservingLookupClean.steps
        (rotationWords G) (rowIndex v (degree d) x).val]
      (some ⟨some (labels (lookupPhaseLabel second (.run .copyFirst))),
        (ambient, register), base⟩) =
      some ⟨some (labels (scanPhaseLabel second)), (ambient, none),
        lookupResultTapes ports base (reverseIndex G (rowIndex v (degree d) x)).val
          indexSuffix⟩ := by
  apply MachinePreservingLookupClean.traceAt_fromTapes (ports ∘ lookupTape)
    (distinct.comp lookupTape_injective)
    (fun l => labels (lookupPhaseLabel second l)) (some (labels (scanPhaseLabel second)))
    target
  · intro l
    cases second
    · exact code (.firstLookup l)
    · exact code (.secondLookup l)
  · exact tableWord
  · exact scratchEmpty
  · exact rotationWords_getElem? G (rowIndex v (degree d) x)
  · exact counterWord
  · exact workEmpty

def lookupPhaseInTime :
    StateTransition.EvalsToInTime (TM2.step target)
      ⟨some (labels (lookupPhaseLabel second (.run .copyFirst))),
        (ambient, register), base⟩
      (some ⟨some (labels (scanPhaseLabel second)), (ambient, none),
        lookupResultTapes ports base (reverseIndex G (rowIndex v (degree d) x)).val
          indexSuffix⟩)
      (6 * (encodeWords (rotationWords G)).length + 4) where
  steps := MachinePreservingLookupClean.steps (rotationWords G) (rowIndex v (degree d) x).val
  evals_in_steps := lookupPhaseTrace second positive H ports distinct labels exit target code
    base G tableWord scratchEmpty x indexSuffix counterWord workEmpty ambient register
  steps_le_m := MachinePreservingLookupClean.steps_le (rotationWords G) _ _
    (rotationWords_getElem? G (rowIndex v (degree d) x))

end Lookup

section Reverse

variable {d : Nat} (second : Bool) (positive : 0 < d)
    (H : Table (cloudSize d) d) (ports : Tape → K)
    (distinct : Function.Injective ports) (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ l, target (labels l) = statement positive H ports labels exit l)
    (base : K → List Bool)
    (ambient : (Ambient ρ d × Fin (degree d)) × Unit) (register : Option Bool)

include positive H distinct exit code

theorem reversePhaseTrace :
    (advance (TM2.step target))^[(base (ports .queryReverse)).length + 1]
      (some ⟨some (labels (reversePhaseLabel second)), (ambient, register), base⟩) =
      some ⟨some (labels (lookupPhaseLabel second (.run .copyFirst))), (ambient, none),
        Reduction.MachineTransfer.tapesAt (ports .queryReverse) (ports .queryIndex) base []
          ((base (ports .queryReverse)).reverse ++ base (ports .queryIndex))⟩ := by
  have h := Reduction.MachineTransfer.transferAt_fromTapes
    (ports .queryReverse) (ports .queryIndex)
    (fun h => (by decide : Tape.queryReverse ≠ .queryIndex) (distinct h))
    id false (labels (reversePhaseLabel second))
    (some (labels (lookupPhaseLabel second (.run .copyFirst)))) target
    (by cases second <;> exact code _) base ambient register
  unfold Reduction.MachineTransfer.nextAt at h
  unfold advance
  simpa only [List.map_id] using h

def reversePhaseInTime :
    StateTransition.EvalsToInTime (TM2.step target)
      ⟨some (labels (reversePhaseLabel second)), (ambient, register), base⟩
      (some ⟨some (labels (lookupPhaseLabel second (.run .copyFirst))), (ambient, none),
        Reduction.MachineTransfer.tapesAt (ports .queryReverse) (ports .queryIndex) base []
          ((base (ports .queryReverse)).reverse ++ base (ports .queryIndex))⟩)
      ((base (ports .queryReverse)).length + 1) where
  steps := (base (ports .queryReverse)).length + 1
  evals_in_steps := reversePhaseTrace second positive H ports distinct labels exit target code
    base ambient register
  steps_le_m := Nat.le_refl _

theorem reversePhaseTrace_unary (index : Nat) (suffix : List Bool)
    (queryWord : base (ports .queryReverse) = (encodeWord index).reverse)
    (indexWord : base (ports .queryIndex) = suffix) :
    (advance (TM2.step target))^[index + 2]
      (some ⟨some (labels (reversePhaseLabel second)), (ambient, register), base⟩) =
      some ⟨some (labels (lookupPhaseLabel second (.run .copyFirst))), (ambient, none),
        Reduction.MachineTransfer.tapesAt (ports .queryReverse) (ports .queryIndex) base []
          (encodeWord index ++ suffix)⟩ := by
  have h := reversePhaseTrace second positive H ports distinct labels exit target code
    base ambient register
  simpa only [queryWord, indexWord, List.length_reverse, encodeWord_length,
    List.reverse_reverse, Nat.add_assoc] using h

end Reverse

end DFVSGames.Foundations.Complexity.MachineExpanderRow
end

section

namespace DFVSGames.Foundations.Complexity.MachineExpanderRow

open Turing MachineComposition
open PCP.ExpanderTables PCP.ExpanderRowControl

@[simp] private theorem dirtyTape_zero : dirtyTape 0 = .queryIndex := rfl
@[simp] private theorem dirtyTape_one : dirtyTape 1 = .lookupOutput := rfl
@[simp] private theorem dirtyTape_two : dirtyTape 2 = .quotientFirst := rfl
@[simp] private theorem dirtyTape_three : dirtyTape 3 = .quotientSecond := rfl
@[simp] private theorem dirtyTape_four : dirtyTape 4 = .remainderFirst := rfl
@[simp] private theorem dirtyTape_five : dirtyTape 5 = .remainderSecond := rfl

variable {K Λ ρ : Type} [DecidableEq K]

def cleanupTapes (ports : Tape → K) (base : K → List Bool) : K → List Bool :=
  Function.update
    (Function.update
      (Function.update
        (Function.update
          (Function.update
            (Function.update base (ports .queryIndex) [])
            (ports .lookupOutput) [])
          (ports .quotientFirst) [])
        (ports .quotientSecond) [])
      (ports .remainderFirst) [])
    (ports .remainderSecond) []

def cleanupSteps (ports : Tape → K) (base : K → List Bool) : Nat :=
  ((base (ports .queryIndex)).length + 1) +
  ((base (ports .lookupOutput)).length + 1) +
  ((base (ports .quotientFirst)).length + 1) +
  ((base (ports .quotientSecond)).length + 1) +
  ((base (ports .remainderFirst)).length + 1) +
  ((base (ports .remainderSecond)).length + 1)

omit [DecidableEq K] in
theorem cleanupSteps_eq_sum (ports : Tape → K) (base : K → List Bool) :
    cleanupSteps ports base = ∑ i : Fin 6, ((base (ports (dirtyTape i))).length + 1) := by
  simp [cleanupSteps, Fin.sum_univ_succ, Nat.add_assoc]

@[simp] theorem cleanupTapes_dirty (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) (i : Fin 6) :
    cleanupTapes ports base (ports (dirtyTape i)) = [] := by
  fin_cases i <;>
    simp [cleanupTapes, distinct.eq_iff]

theorem cleanupTapes_other (ports : Tape → K) (base : K → List Bool) (k : K)
    (outside : ∀ i : Fin 6, k ≠ ports (dirtyTape i)) :
    cleanupTapes ports base k = base k := by
  have h0 := outside 0
  have h1 := outside 1
  have h2 := outside 2
  have h3 := outside 3
  have h4 := outside 4
  have h5 := outside 5
  change k ≠ ports .queryIndex at h0
  change k ≠ ports .lookupOutput at h1
  change k ≠ ports .quotientFirst at h2
  change k ≠ ports .quotientSecond at h3
  change k ≠ ports .remainderFirst at h4
  change k ≠ ports .remainderSecond at h5
  simp [cleanupTapes, h0, h1, h2, h3, h4, h5]

@[simp] theorem cleanupTapes_table (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) :
    cleanupTapes ports base (ports .table) = base (ports .table) := by
  simp [cleanupTapes, distinct.eq_iff]

@[simp] theorem cleanupTapes_inputVertex (ports : Tape → K)
    (distinct : Function.Injective ports) (base : K → List Bool) :
    cleanupTapes ports base (ports .inputVertex) = base (ports .inputVertex) := by
  simp [cleanupTapes, distinct.eq_iff]

@[simp] theorem cleanupTapes_output (ports : Tape → K) (distinct : Function.Injective ports)
    (base : K → List Bool) :
    cleanupTapes ports base (ports .output) = base (ports .output) := by
  simp [cleanupTapes, distinct.eq_iff]

private theorem join_trace_inline_MachineExpanderRowCleanup {A : Type*} {f : A → A} {m n : Nat} {a b c : A}
    (first : f^[m] a = b) (second : f^[n] b = c) : f^[m + n] a = c := by
  rw [Nat.add_comm m n, Function.iterate_add_apply, first, second]

variable [Fintype ρ] {d : Nat}

theorem cleanupOneTraceAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (i : Fin 6) (base : K → List Bool) (state : State ρ d) :
    (advance (TM2.step target))^[((base (ports (dirtyTape i))).length + 1)]
      (some ⟨some (labels (.cleanup i)), state, base⟩) =
      some ⟨some (if hi : i.val + 1 < 6 then labels (.cleanup ⟨i.val + 1, hi⟩)
          else labels .done),
        (state.1, none), Function.update base (ports (dirtyTape i)) []⟩ := by
  have run := MachineDrain.drainTrace (ports (dirtyTape i)) (labels (.cleanup i))
    (some (if hi : i.val + 1 < 6 then labels (.cleanup ⟨i.val + 1, hi⟩)
      else labels .done)) target
    (by simpa only [statement] using code (.cleanup i))
    base (base (ports (dirtyTape i))) state.1 state.2
  simpa only [Function.update_eq_self] using run

theorem cleanupTraceAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (distinct : Function.Injective ports)
    (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (base : K → List Bool) (state : State ρ d) :
    (advance (TM2.step target))^[cleanupSteps ports base]
      (some ⟨some (labels (.cleanup 0)), state, base⟩) =
      some ⟨some (labels .done), (state.1, none), cleanupTapes ports base⟩ := by
  let t1 := Function.update base (ports .queryIndex) []
  let t2 := Function.update t1 (ports .lookupOutput) []
  let t3 := Function.update t2 (ports .quotientFirst) []
  let t4 := Function.update t3 (ports .quotientSecond) []
  let t5 := Function.update t4 (ports .remainderFirst) []
  have h0 := cleanupOneTraceAt positive H ports labels exit target code 0 base state
  have h1 := cleanupOneTraceAt positive H ports labels exit target code 1 t1 (state.1, none)
  have h2 := cleanupOneTraceAt positive H ports labels exit target code 2 t2 (state.1, none)
  have h3 := cleanupOneTraceAt positive H ports labels exit target code 3 t3 (state.1, none)
  have h4 := cleanupOneTraceAt positive H ports labels exit target code 4 t4 (state.1, none)
  have h5 := cleanupOneTraceAt positive H ports labels exit target code 5 t5 (state.1, none)
  simp [t1, t2, t3, t4, t5, distinct.eq_iff,
    -Function.iterate_succ] at h0 h1 h2 h3 h4 h5
  have finished := join_trace_inline_MachineExpanderRowCleanup (join_trace_inline_MachineExpanderRowCleanup (join_trace_inline_MachineExpanderRowCleanup (join_trace_inline_MachineExpanderRowCleanup (join_trace_inline_MachineExpanderRowCleanup h0 h1) h2) h3) h4) h5
  simpa only [cleanupSteps, cleanupTapes] using finished

theorem doneStepAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (base : K → List Bool) (state : State ρ d) :
    TM2.step target ⟨some (labels .done), state, base⟩ = some ⟨exit, state, base⟩ := by
  change some (TM2.stepAux (target (labels .done)) state base) = _
  rw [code]
  cases exit <;> rfl

theorem cleanupExitTraceAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (distinct : Function.Injective ports)
    (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (base : K → List Bool) (state : State ρ d) :
    (advance (TM2.step target))^[cleanupSteps ports base + 1]
      (some ⟨some (labels (.cleanup 0)), state, base⟩) =
      some ⟨exit, (state.1, none), cleanupTapes ports base⟩ := by
  have cleaned := cleanupTraceAt positive H ports distinct labels exit target code base state
  have done : (advance (TM2.step target))^[1]
      (some ⟨some (labels .done), (state.1, none), cleanupTapes ports base⟩) =
      some ⟨exit, (state.1, none), cleanupTapes ports base⟩ := by
    simpa only [Function.iterate_one, advance_some] using
      doneStepAt positive H ports labels exit target code (cleanupTapes ports base) (state.1, none)
  exact join_trace_inline_MachineExpanderRowCleanup cleaned done

def initializedTapes (ports : Tape → K) (base : K → List Bool) : K → List Bool :=
  Function.update
    (Function.update
      (Function.update
        (Function.update base (ports .quotientFirst) (false :: base (ports .quotientFirst)))
        (ports .quotientSecond) (false :: base (ports .quotientSecond)))
      (ports .remainderFirst) (false :: base (ports .remainderFirst)))
    (ports .remainderSecond) (false :: base (ports .remainderSecond))

theorem initializeStepAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (distinct : Function.Injective ports)
    (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (base : K → List Bool) (state : State ρ d) :
    TM2.step target ⟨some (labels .initialize), state, base⟩ =
      some ⟨some (labels (.firstEmit (PCP.AlphabetTable.Emitter.labelAt 3 _ 0 .entry))),
        (state.1, none), initializedTapes ports base⟩ := by
  change some (TM2.stepAux (target (labels .initialize)) state base) = _
  rw [code]
  simp [statement, TM2.stepAux, initializedTapes, distinct.eq_iff]

def clearedQueryTapes (ports : Tape → K) (base : K → List Bool) : K → List Bool :=
  Function.update
    (Function.update base (ports .queryIndex) (base (ports .queryIndex)).tail)
    (ports .lookupOutput) (base (ports .lookupOutput)).tail

theorem clearQueryStepAt (positive : 0 < d) (H : Table (cloudSize d) d)
    (ports : Tape → K) (distinct : Function.Injective ports)
    (labels : Label d → Λ) (exit : Option Λ)
    (target : Λ → TM2.Stmt (fun _ : K => Bool) Λ (State ρ d))
    (code : ∀ label, target (labels label) = statement positive H ports labels exit label)
    (base : K → List Bool) (state : State ρ d) :
    TM2.step target ⟨some (labels .clearQuery), state, base⟩ =
      some ⟨some (labels (.secondEmit (PCP.AlphabetTable.Emitter.labelAt 3 _ 0 .entry))),
        state, clearedQueryTapes ports base⟩ := by
  change some (TM2.stepAux (target (labels .clearQuery)) state base) = _
  rw [code]
  simp [statement, TM2.stepAux, clearedQueryTapes, distinct.eq_iff]

end DFVSGames.Foundations.Complexity.MachineExpanderRow
end

section

namespace DFVSGames.Foundations.Complexity.MachineExpanderRow

open PCP.ExpanderTables PCP.ExpanderRowControl PCP.ExpanderTableWords

structure RowData (v d : Nat) where
  oldTable : Table v (degree d)
  smallTable : Table (cloudSize d) d
  inputVertex : Fin v
  inputCloud : Fin (cloudSize d)
  inputPort : Fin (degree d)

def rowData {v d : Nat} (G : Table v (degree d)) (H : Table (cloudSize d) d)
    (vertex : Fin v) (cloud : Fin (cloudSize d)) (port : Fin (degree d)) : RowData v d :=
  ⟨G, H, vertex, cloud, port⟩

namespace RowData

variable {v d : Nat} (r : RowData v d)

def control0 : Control d := start r.smallTable r.inputCloud r.inputPort
def firstRow : Fin (v * degree d) := rowIndex v (degree d) (r.inputVertex, firstOffset r.control0)
def firstValue : Nat := (reverseIndex r.oldTable r.firstRow).val
def firstPair : Fin v × Fin (degree d) := lookup r.oldTable (r.inputVertex, firstOffset r.control0)
def firstVertex : Fin v := r.firstPair.1
def firstReturn : Fin (degree d) := r.firstPair.2
def control1 : Control d := receiveFirst r.control0 r.firstReturn
def secondRow : Fin (v * degree d) := rowIndex v (degree d) (r.firstVertex, secondOffset r.control1)
def secondValue : Nat := (reverseIndex r.oldTable r.secondRow).val
def secondPair : Fin v × Fin (degree d) := lookup r.oldTable (r.firstVertex, secondOffset r.control1)
def secondVertex : Fin v := r.secondPair.1
def secondReturn : Fin (degree d) := r.secondPair.2
def control2 : Control d := receiveSecond r.smallTable r.control1 r.secondReturn
def query1 : Nat := firstAddress r.inputVertex.val r.control0
def query2 : Nat := secondAddress r.firstVertex.val r.control1
def finalValue : Nat := outputAddress r.secondVertex.val r.control2
def tableLength : Nat := (encodeWords (rotationWords r.oldTable)).length

theorem query1_eq_firstRow : r.query1 = r.firstRow.val :=
  firstAddress_eq_rowIndex r.inputVertex r.control0

theorem query2_eq_secondRow : r.query2 = r.secondRow.val :=
  secondAddress_eq_rowIndex r.firstVertex r.control1

@[simp] theorem firstValue_div_degree : r.firstValue / degree d = r.firstVertex.val := rfl
@[simp] theorem firstValue_mod_degree : r.firstValue % degree d = r.firstReturn.val := rfl
@[simp] theorem secondValue_div_degree : r.secondValue / degree d = r.secondVertex.val := rfl
@[simp] theorem secondValue_mod_degree : r.secondValue % degree d = r.secondReturn.val := rfl

theorem firstReturn_eq_residue (positive : 0 < d) :
    r.firstReturn = MachineFixedDivMod.residue (degree d) (Nat.mul_pos positive positive)
      r.firstValue := Fin.ext rfl

theorem secondReturn_eq_residue (positive : 0 < d) :
    r.secondReturn = MachineFixedDivMod.residue (degree d) (Nat.mul_pos positive positive)
      r.secondValue := Fin.ext rfl

theorem receiveFirst_residue_eq_control1 (positive : 0 < d) :
    receiveFirst r.control0 (MachineFixedDivMod.residue (degree d)
      (Nat.mul_pos positive positive) r.firstValue) = r.control1 := by
  rw [← r.firstReturn_eq_residue positive]
  rfl

theorem receiveSecond_residue_eq_control2 (positive : 0 < d) :
    receiveSecond r.smallTable r.control1 (MachineFixedDivMod.residue (degree d)
      (Nat.mul_pos positive positive) r.secondValue) = r.control2 := by
  rw [← r.secondReturn_eq_residue positive]
  rfl

theorem firstSelected : (rotationWords r.oldTable)[r.query1]? = some r.firstValue := by
  rw [query1_eq_firstRow]
  exact rotationWords_getElem? r.oldTable r.firstRow

theorem secondSelected : (rotationWords r.oldTable)[r.query2]? = some r.secondValue := by
  rw [query2_eq_secondRow]
  exact rotationWords_getElem? r.oldTable r.secondRow

theorem evaluateRow_eq : evaluateRow r.oldTable r.smallTable r.inputVertex r.inputCloud r.inputPort =
    (r.secondVertex, r.control2) := rfl

theorem finalValue_eq_step_reverseIndex :
    r.finalValue = (reverseIndex (step r.oldTable r.smallTable)
      (rowIndex (v * cloudSize d) (degree d)
        (rowIndex v (cloudSize d) (r.inputVertex, r.inputCloud), r.inputPort))).val := by
  simpa only [evaluateRow_eq, finalValue] using outputAddress_eq_step_reverseIndex
    r.oldTable r.smallTable r.inputVertex r.inputCloud r.inputPort

theorem rows_le_tableLength : v * degree d ≤ r.tableLength := by
  simp only [tableLength, encodeWords_length, rotationWords_length]
  omega

theorem query1_le_tableLength : r.query1 ≤ r.tableLength := by
  rw [query1_eq_firstRow]
  exact r.firstRow.isLt.le.trans r.rows_le_tableLength

theorem query2_le_tableLength : r.query2 ≤ r.tableLength := by
  rw [query2_eq_secondRow]
  exact r.secondRow.isLt.le.trans r.rows_le_tableLength

theorem firstValue_le_tableLength : r.firstValue ≤ r.tableLength :=
  (reverseIndex r.oldTable r.firstRow).isLt.le.trans r.rows_le_tableLength

theorem secondValue_le_tableLength : r.secondValue ≤ r.tableLength :=
  (reverseIndex r.oldTable r.secondRow).isLt.le.trans r.rows_le_tableLength

theorem inputVertex_le_tableLength : r.inputVertex.val ≤ r.tableLength := by
  have hq : 1 ≤ degree d := Nat.zero_lt_of_lt r.inputPort.isLt
  have hv : v ≤ v * degree d := by simpa using Nat.mul_le_mul_left v hq
  exact r.inputVertex.isLt.le.trans (hv.trans r.rows_le_tableLength)

theorem firstVertex_le_tableLength : r.firstVertex.val ≤ r.tableLength := by
  rw [← firstValue_div_degree]
  exact (Nat.div_le_self r.firstValue (degree d)).trans r.firstValue_le_tableLength

theorem secondVertex_le_tableLength : r.secondVertex.val ≤ r.tableLength := by
  rw [← secondValue_div_degree]
  exact (Nat.div_le_self r.secondValue (degree d)).trans r.secondValue_le_tableLength

theorem firstReturn_le_tableLength : r.firstReturn.val ≤ r.tableLength := by
  rw [← firstValue_mod_degree]
  exact (Nat.mod_le r.firstValue (degree d)).trans r.firstValue_le_tableLength

theorem secondReturn_le_tableLength : r.secondReturn.val ≤ r.tableLength := by
  rw [← secondValue_mod_degree]
  exact (Nat.mod_le r.secondValue (degree d)).trans r.secondValue_le_tableLength

end RowData

variable {v d : Nat}

def frameContents (r : RowData v d) (output : List Bool)
    (qr qi lo q1 q2 r1 r2 : List Bool) : Tape → List Bool
  | .inputVertex => encodeWord r.inputVertex.val
  | .table => encodeWords (rotationWords r.oldTable)
  | .output => output
  | .queryReverse => qr
  | .queryIndex => qi
  | .lookupOutput => lo
  | .quotientFirst => q1
  | .quotientSecond => q2
  | .remainderFirst => r1
  | .remainderSecond => r2
  | _ => []

def frame0 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  frameContents r output [] [] [] [] [] [] []
def frame1 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  initializedTapes id (frame0 r output)
def frame2 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  emittedWord .queryReverse (frame1 r output) r.query1
def frame3 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  Reduction.MachineTransfer.tapesAt .queryReverse .queryIndex (frame2 r output) []
    (encodeWord r.query1)
def frame4 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  lookupResultTapes id (frame3 r output) r.firstValue []
def frame5 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  divisionOutput d id .quotientFirst .remainderFirst (frame4 r output) r.firstValue [] [] []
def frame6 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  clearedQueryTapes id (frame5 r output)
def frame7 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  emittedWord .queryReverse (frame6 r output) r.query2
def frame8 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  Reduction.MachineTransfer.tapesAt .queryReverse .queryIndex (frame7 r output) []
    (encodeWord r.query2)
def frame9 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  lookupResultTapes id (frame8 r output) r.secondValue []
def frame10 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  divisionOutput d id .quotientSecond .remainderSecond (frame9 r output) r.secondValue [] [] []
def frame11 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  emittedWord .output (frame10 r output) r.finalValue
def frame12 (r : RowData v d) (output : List Bool) : Tape → List Bool :=
  cleanupTapes id (frame11 r output)

private theorem lookupResultTapes_id_eq_inline_MachineExpanderRowFrames (base : Tape → List Bool)
    (value : Nat) (suffix : List Bool) :
    lookupResultTapes id base value suffix =
      Function.update
        (Function.update (Function.update base .queryIndex (encodeWord 0 ++ suffix))
          .lookupWork [])
        .lookupOutput (encodeWord value ++ base .lookupOutput) := rfl

@[simp] theorem frame1_eq (r : RowData v d) (output : List Bool) :
    frame1 r output = frameContents r output [] [] []
      (encodeWord 0) (encodeWord 0) (encodeWord 0) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame1, frame0, frameContents, initializedTapes, encodeWord]

@[simp] theorem frame2_eq (r : RowData v d) (output : List Bool) :
    frame2 r output = frameContents r output (encodeWord r.query1).reverse [] []
      (encodeWord 0) (encodeWord 0) (encodeWord 0) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame2, frameContents, emittedWord]

@[simp] theorem frame3_eq (r : RowData v d) (output : List Bool) :
    frame3 r output = frameContents r output [] (encodeWord r.query1) []
      (encodeWord 0) (encodeWord 0) (encodeWord 0) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame3, frameContents, Reduction.MachineTransfer.tapesAt]

@[simp] theorem frame4_eq (r : RowData v d) (output : List Bool) :
    frame4 r output = frameContents r output [] (encodeWord 0) (encodeWord r.firstValue)
      (encodeWord 0) (encodeWord 0) (encodeWord 0) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame4, lookupResultTapes_id_eq_inline_MachineExpanderRowFrames, frameContents]

@[simp] theorem frame5_eq (r : RowData v d) (output : List Bool) :
    frame5 r output = frameContents r output [] (encodeWord 0) (encodeWord 0)
      (encodeWord r.firstVertex.val) (encodeWord 0)
      (encodeWord r.firstReturn.val) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame5, divisionOutput, MachineFixedDivMod.unaryTapes,
    MachineFixedDivMod.tapes, MachineCopy.forkTapes, frameContents]

@[simp] theorem frame6_eq (r : RowData v d) (output : List Bool) :
    frame6 r output = frameContents r output [] [] [] (encodeWord r.firstVertex.val)
      (encodeWord 0) (encodeWord r.firstReturn.val) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame6, clearedQueryTapes, frameContents, encodeWord]

@[simp] theorem frame7_eq (r : RowData v d) (output : List Bool) :
    frame7 r output = frameContents r output (encodeWord r.query2).reverse [] []
      (encodeWord r.firstVertex.val) (encodeWord 0)
      (encodeWord r.firstReturn.val) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame7, emittedWord, frameContents]

@[simp] theorem frame8_eq (r : RowData v d) (output : List Bool) :
    frame8 r output = frameContents r output [] (encodeWord r.query2) []
      (encodeWord r.firstVertex.val) (encodeWord 0)
      (encodeWord r.firstReturn.val) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame8, Reduction.MachineTransfer.tapesAt, frameContents]

@[simp] theorem frame9_eq (r : RowData v d) (output : List Bool) :
    frame9 r output = frameContents r output [] (encodeWord 0) (encodeWord r.secondValue)
      (encodeWord r.firstVertex.val) (encodeWord 0)
      (encodeWord r.firstReturn.val) (encodeWord 0) := by
  funext tape
  cases tape <;> simp [frame9, lookupResultTapes_id_eq_inline_MachineExpanderRowFrames, frameContents]

@[simp] theorem frame10_eq (r : RowData v d) (output : List Bool) :
    frame10 r output = frameContents r output [] (encodeWord 0) (encodeWord 0)
      (encodeWord r.firstVertex.val) (encodeWord r.secondVertex.val)
      (encodeWord r.firstReturn.val) (encodeWord r.secondReturn.val) := by
  funext tape
  cases tape <;> simp [frame10, divisionOutput, MachineFixedDivMod.unaryTapes,
    MachineFixedDivMod.tapes, MachineCopy.forkTapes, frameContents]

@[simp] theorem frame11_eq (r : RowData v d) (output : List Bool) :
    frame11 r output = frameContents r ((encodeWord r.finalValue).reverse ++ output)
      [] (encodeWord 0) (encodeWord 0)
      (encodeWord r.firstVertex.val) (encodeWord r.secondVertex.val)
      (encodeWord r.firstReturn.val) (encodeWord r.secondReturn.val) := by
  funext tape
  cases tape <;> simp [frame11, emittedWord, frameContents]

@[simp] theorem frame12_eq (r : RowData v d) (output : List Bool) :
    frame12 r output = frameContents r ((encodeWord r.finalValue).reverse ++ output)
      [] [] [] [] [] [] [] := by
  funext tape
  cases tape <;> simp [frame12, cleanupTapes, frameContents]

theorem final_frame_eq (r : RowData v d) (output : List Bool) :
    frame12 r output = emittedWord .output (frame0 r output) r.finalValue := by
  funext tape
  cases tape <;> simp [frame0, emittedWord, frameContents]

@[simp] theorem frame0_inputVertex (r : RowData v d) (output : List Bool) :
    frame0 r output .inputVertex = encodeWord r.inputVertex.val := rfl

@[simp] theorem frame0_table (r : RowData v d) (output : List Bool) :
    frame0 r output .table = encodeWords (rotationWords r.oldTable) := rfl

@[simp] theorem frame0_output (r : RowData v d) (output : List Bool) :
    frame0 r output .output = output := rfl

@[simp] theorem frame1_inputVertex (r : RowData v d) (output : List Bool) :
    frame1 r output .inputVertex = encodeWord r.inputVertex.val := by simp [frameContents]

@[simp] theorem frame1_emitScratch (r : RowData v d) (output : List Bool) :
    frame1 r output .emitScratch = [] := by simp [frameContents]

@[simp] theorem frame2_queryReverse (r : RowData v d) (output : List Bool) :
    frame2 r output .queryReverse = (encodeWord r.query1).reverse := by simp [frameContents]

@[simp] theorem frame2_queryIndex (r : RowData v d) (output : List Bool) :
    frame2 r output .queryIndex = [] := by simp [frameContents]

@[simp] theorem frame3_table (r : RowData v d) (output : List Bool) :
    frame3 r output .table = encodeWords (rotationWords r.oldTable) := by simp [frameContents]

@[simp] theorem frame3_lookupRestore (r : RowData v d) (output : List Bool) :
    frame3 r output .lookupRestore = [] := by simp [frameContents]

@[simp] theorem frame3_lookupWork (r : RowData v d) (output : List Bool) :
    frame3 r output .lookupWork = [] := by simp [frameContents]

@[simp] theorem frame3_lookupOutput (r : RowData v d) (output : List Bool) :
    frame3 r output .lookupOutput = [] := by simp [frameContents]

@[simp] theorem frame3_queryIndex (r : RowData v d) (output : List Bool) :
    frame3 r output .queryIndex = encodeWord r.query1 := by simp [frameContents]

@[simp] theorem frame4_lookupOutput (r : RowData v d) (output : List Bool) :
    frame4 r output .lookupOutput = encodeWord r.firstValue := by simp [frameContents]

@[simp] theorem frame4_quotientFirst (r : RowData v d) (output : List Bool) :
    frame4 r output .quotientFirst = encodeWord 0 := by simp [frameContents]

@[simp] theorem frame4_remainderFirst (r : RowData v d) (output : List Bool) :
    frame4 r output .remainderFirst = encodeWord 0 := by simp [frameContents]

@[simp] theorem frame6_quotientFirst (r : RowData v d) (output : List Bool) :
    frame6 r output .quotientFirst = encodeWord r.firstVertex.val := by simp [frameContents]

@[simp] theorem frame6_emitScratch (r : RowData v d) (output : List Bool) :
    frame6 r output .emitScratch = [] := by simp [frameContents]

@[simp] theorem frame7_queryReverse (r : RowData v d) (output : List Bool) :
    frame7 r output .queryReverse = (encodeWord r.query2).reverse := by simp [frameContents]

@[simp] theorem frame7_queryIndex (r : RowData v d) (output : List Bool) :
    frame7 r output .queryIndex = [] := by simp [frameContents]

@[simp] theorem frame8_table (r : RowData v d) (output : List Bool) :
    frame8 r output .table = encodeWords (rotationWords r.oldTable) := by simp [frameContents]

@[simp] theorem frame8_lookupRestore (r : RowData v d) (output : List Bool) :
    frame8 r output .lookupRestore = [] := by simp [frameContents]

@[simp] theorem frame8_lookupWork (r : RowData v d) (output : List Bool) :
    frame8 r output .lookupWork = [] := by simp [frameContents]

@[simp] theorem frame8_lookupOutput (r : RowData v d) (output : List Bool) :
    frame8 r output .lookupOutput = [] := by simp [frameContents]

@[simp] theorem frame8_queryIndex (r : RowData v d) (output : List Bool) :
    frame8 r output .queryIndex = encodeWord r.query2 := by simp [frameContents]

@[simp] theorem frame9_lookupOutput (r : RowData v d) (output : List Bool) :
    frame9 r output .lookupOutput = encodeWord r.secondValue := by simp [frameContents]

@[simp] theorem frame9_quotientSecond (r : RowData v d) (output : List Bool) :
    frame9 r output .quotientSecond = encodeWord 0 := by simp [frameContents]

@[simp] theorem frame9_remainderSecond (r : RowData v d) (output : List Bool) :
    frame9 r output .remainderSecond = encodeWord 0 := by simp [frameContents]

@[simp] theorem frame10_quotientSecond (r : RowData v d) (output : List Bool) :
    frame10 r output .quotientSecond = encodeWord r.secondVertex.val := by simp [frameContents]

@[simp] theorem frame10_emitScratch (r : RowData v d) (output : List Bool) :
    frame10 r output .emitScratch = [] := by simp [frameContents]

@[simp] theorem frame10_output (r : RowData v d) (output : List Bool) :
    frame10 r output .output = output := by simp [frameContents]

theorem final_dirty_word_length_le (r : RowData v d) (output : List Bool) (i : Fin 6) :
    ((frame11 r output) (dirtyTape i)).length ≤ r.tableLength + 1 := by
  have h1 := r.firstVertex_le_tableLength
  have h2 := r.secondVertex_le_tableLength
  have h3 := r.firstReturn_le_tableLength
  have h4 := r.secondReturn_le_tableLength
  fin_cases i <;> simp only [frame11_eq, dirtyTape, frameContents, encodeWord_length] <;> omega

theorem cleanupSteps_le_tableLength (r : RowData v d) (output : List Bool) :
    cleanupSteps id (frame11 r output) ≤ 6 * (r.tableLength + 1) + 6 := by
  have h1 := r.firstVertex_le_tableLength
  have h2 := r.secondVertex_le_tableLength
  have h3 := r.firstReturn_le_tableLength
  have h4 := r.secondReturn_le_tableLength
  simp only [cleanupSteps, frame11_eq, id_eq, frameContents, encodeWord_length]
  omega

end DFVSGames.Foundations.Complexity.MachineExpanderRow
end

end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end
end

end OAI