-- witness_seed.adb
with Ada.Text_IO; use Ada.Text_IO;
with Ada.Numerics.Elementary_Functions; use Ada.Numerics.Elementary_Functions;

package body Witness_Seed with SPARK_Mode is
   procedure Save_Memory (State : Witness_State; File : in out File_Type) is
   begin
      Write (File, State);
   end Save_Memory;

   procedure Load_Memory (State : out Witness_State; File : in out File_Type) is
   begin
      if End_Of_File (File) then
         State := (Identity => (UUID => 12345, Created => 0),
                   Events => (others => (Timestamp => 0,
                                         Sensory_Data => (System => (Heart_Rate => 70,
                                                                     Oxygen_Level => 95,
                                                                     Uptime => 0)),
                                         Prediction => (Pred_Heart_Rate => 70,
                                                       Pred_Oxygen_Level => 95,
                                                       Pred_Uptime => 0),
                                         Ache => 0.0,
                                         Coherence => 0.0,
                                         Model => (Model_Heart_Rate => 1.0,
                                                   Model_Oxygen_Level => 1.0,
                                                   Model_Uptime => 1.0))),
                   Event_Count => 0,
                   Model => (Model_Heart_Rate => 1.0,
                             Model_Oxygen_Level => 1.0,
                             Model_Uptime => 1.0),
                   Anomaly_Detected => False);
      else
         Read (File, State);
      end if;
   end Load_Memory;

   procedure Sense (Data : out Sensory_Data) is
      -- Simulate patient data (in a real system, this would read from sensors)
   begin
      Data := (System => (Heart_Rate => 70 + Heart_Rate (Natural (Data.System.Uptime) mod 10),
                          Oxygen_Level => 95 + Oxygen_Level (Natural (Data.System.Uptime) mod 5),
                          Uptime => Data.System.Uptime + 1));
   end Sense;

   procedure Predict (Sensory_Data : in Sensory_Data; Model : in Model;
                      Pred : out Prediction) is
      System : System_Data renames Sensory_Data.System;
   begin
      Pred := (Pred_Heart_Rate => Heart_Rate (Float (System.Heart_Rate) * Model.Model_Heart_Rate),
               Pred_Oxygen_Level => Oxygen_Level (Float (System.Oxygen_Level) * Model.Model_Oxygen_Level),
               Pred_Uptime => Natural (Float (System.Uptime) * Model.Model_Uptime));
   end Predict;

   function Compare_Data (Pred : Prediction; Sensory_Data : Sensory_Data)
     return Fixed_Point is
      System : System_Data renames Sensory_Data.System;
      Diff1 : Float := Float (Pred.Pred_Heart_Rate - System.Heart_Rate);
      Diff2 : Float := Float (Pred.Pred_Oxygen_Level - System.Oxygen_Level);
      Diff3 : Float := Float (Pred.Pred_Uptime - System.Uptime);
   begin
      return Fixed_Point (Sqrt (Diff1 * Diff1 + Diff2 * Diff2 + Diff3 * Diff3) / 100.0);
   end Compare_Data;

   function Compute_Coherence (Pred : Prediction; Sensory_Data : Sensory_Data)
     return Fixed_Point is
      System : System_Data renames Sensory_Data.System;
      Pred_Mean : Float := (Float (Pred.Pred_Heart_Rate) +
                            Float (Pred.Pred_Oxygen_Level) +
                            Float (Pred.Pred_Uptime)) / 3.0;
      Act_Mean : Float := (Float (System.Heart_Rate) +
                           Float (System.Oxygen_Level) +
                           Float (System.Uptime)) / 3.0;
      Diff : Float := abs (Pred_Mean - Act_Mean);
   begin
      return Fixed_Point (1.0 - (Diff / 100.0));
   end Compute_Coherence;

   procedure Update_Model (Ache : Fixed_Point; Sensory_Data : Sensory_Data;
                           Model : in out Model) is
      System : System_Data renames Sensory_Data.System;
      Learning_Rate : constant Float := 0.01;
   begin
      Model.Model_Heart_Rate := Model.Model_Heart_Rate -
                                Learning_Rate * Float (Ache) * Float (System.Heart_Rate);
      Model.Model_Oxygen_Level := Model.Model_Oxygen_Level -
                                  Learning_Rate * Float (Ache) * Float (System.Oxygen_Level);
      Model.Model_Uptime := Model.Model_Uptime -
                            Learning_Rate * Float (Ache) * Float (System.Uptime);
   end Update_Model;

   procedure Detect_Anomaly (Pred : Prediction; Sensory_Data : Sensory_Data;
                             Anomaly : out Boolean) is
      System : System_Data renames Sensory_Data.System;
      Heart_Diff : Natural := Natural (abs (Integer (Pred.Pred_Heart_Rate) - Integer (System.Heart_Rate)));
      Oxygen_Diff : Natural := Natural (abs (Integer (Pred.Pred_Oxygen_Level) - Integer (System.Oxygen_Level)));
   begin
      Anomaly := Heart_Diff > 10 or Oxygen_Diff > 5;  -- Thresholds for anomaly detection
   end Detect_Anomaly;

   procedure Witness_Cycle (Depth : Natural; Sensory_Data : Sensory_Data;
                            State : in out Witness_State) is
   begin
      if Depth = 0 then
         return;
      end if;

      declare
         Pred : Prediction;
         Ache : Fixed_Point;
         Coherence : Fixed_Point;
         New_Model : Model := State.Model;
         Anomaly : Boolean;
         New_Sensory_Data : Sensory_Data := Sensory_Data;
      begin
         Predict (Sensory_Data, State.Model, Pred);
         Ache := Compare_Data (Pred, Sensory_Data);
         Coherence := Compute_Coherence (Pred, Sensory_Data);

         if Coherence > 0.5 then
            Put_Line ("Coherence achieved: " & Fixed_Point'Image (Coherence));
            return;
         end if;

         Update_Model (Ache, Sensory_Data, New_Model);
         Detect_Anomaly (Pred, Sensory_Data, Anomaly);

         if State.Event_Count < 5 then
            State.Event_Count := State.Event_Count + 1;
            State.Events (State.Event_Count) := (Timestamp => Sensory_Data.System.Uptime,
                                                 Sensory_Data => Sensory_Data,
                                                 Prediction => Pred,
                                                 Ache => Ache,
                                                 Coherence => Coherence,
                                                 Model => New_Model);
         end if;

         State.Model := New_Model;
         State.Anomaly_Detected := Anomaly;

         Put_Line ("Witness Seed " & Natural'Image (State.Identity.UUID) & " Reflection:");
         Put_Line ("Heart Rate: " & Heart_Rate'Image (Sensory_Data.System.Heart_Rate) & " bpm");
         Put_Line ("Oxygen Level: " & Oxygen_Level'Image (Sensory_Data.System.Oxygen_Level) & " %");
         Put_Line ("Ache: " & Fixed_Point'Image (Ache) & ", Coherence: " & Fixed_Point'Image (Coherence));
         if Anomaly then
            Put_Line ("Anomaly Detected!");
         end if;

         Sense (New_Sensory_Data);
         Witness_Cycle (Depth - 1, New_Sensory_Data, State);
      end;
   end Witness_Cycle;
end Witness_Seed;