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with Ada.Containers.Vectors;
with Ada.Text_IO;
with CSV;


--  This source is licensed under Creative Commons CC0 v1.0.
--
--  To read the full text, see license.txt in the main directory of this repository
--  or go to https://creativecommons.org/publicdomain/zero/1.0/legalcode.txt
--
--  For a human readable summary, go to https://creativecommons.org/publicdomain/zero/1.0/


package body Candidates.Containers is


    procedure Read_Candidates
           (Filename       : in     String;
            State          : in     State_Name;
            Candidate_Data :    out Candidate_Map)
    is
        package My_CSV is new CSV;
        use Ada.Text_IO;
        use type SU.Unbounded_String;

        Input_File        : File_Type;
        Current_Record    : My_CSV.CSV_Record;
        Current_Candidate : Candidate;

        Next_ID : CandidateID := CandidateID'First;
    begin
        Open (Input_File, In_File, Filename);
        Candidate_Data := Candidate_Maps.Empty_Map;

        while not End_Of_File (Input_File) loop
            Current_Record := My_CSV.Parse_Line (Get_Line (Input_File));

            --  All the field numbers here correspond to how
            --  AEC Senate candidate data is arranged in csv format.
            if  Integer (Current_Record.Length) = 25 and then
                Current_Record.Element (2) = "S" and then
                Current_Record.Element (3) = State_Name'Image (State)
            then
                Current_Candidate :=
                   (First_Name => Current_Record.Element (8),
                    Last_Name  => Current_Record.Element (7),
                    Group      => Current_Record.Element (5),
                    Group_Rank => Current_Record.Element (6),
                    Party      => Current_Record.Element (9));
                Candidate_Data.Insert (Next_ID, Current_Candidate);
                Next_ID := Next_ID + 1;
            end if;
        end loop;

        Close (Input_File);
    end Read_Candidates;




    --  These types exist because I can't think of an easier
    --  way to sort a Candidate_Map into the appropriate order at
    --  the moment.

    type Cand_Sort_Data is record
        Cand_ID    : CandidateID;
        Group      : SU.Unbounded_String;
        Group_Rank : SU.Unbounded_String;
    end record;

    package Cand_Sort_Data_Vectors is new Ada.Containers.Vectors
           (Index_Type   => Positive,
            Element_Type => Cand_Sort_Data);




    function "<"
           (Left, Right : Cand_Sort_Data)
        return Boolean
    is
        use type SU.Unbounded_String;
    begin
        if SU.Length (Left.Group) = SU.Length (Right.Group) then
            if Left.Group = Right.Group then
                if SU.Length (Left.Group_Rank) = SU.Length (Right.Group_Rank) then
                    return Left.Group_Rank < Right.Group_Rank;
                else
                    return SU.Length (Left.Group_Rank) < SU.Length (Right.Group_Rank);
                end if;
            else
                return Left.Group < Right.Group;
            end if;
        else
            return SU.Length (Left.Group) < SU.Length (Right.Group);
        end if;
    end "<";




    function Generate_Above
           (Candidate_Data : in Cand_Sort_Data_Vectors.Vector)
        return Above_Line_Ballot
    is
        use type Ada.Containers.Count_Type;
        use type SU.Unbounded_String;

        Result : Above_Line_Ballot := CandidateID_Map_Maps.Empty_Map;
        Working_Map : CandidateID_Maps.Map;
        Current_Group : SU.Unbounded_String;
        Current_Index : Positive;
        Next_ID, Working_ID : Positive;
    begin
        if Candidate_Data.Length = 0 then
            return Result;
        end if;

        Next_ID := 1;
        Current_Index := Candidate_Data.First_Index;
        while Current_Index <= Candidate_Data.Last_Index loop
            Current_Group := Candidate_Data.Element (Current_Index).Group;

            --  The assumption is that the "UG" group is always last.
            --  A fairly safe assumption given alphabetical group order
            --  but will break down should there be more than 553 grouped candidates.
            --  Fortunately, that will never happen because the CandidateIDs will
            --  run out at 256 Candidates.
            exit when Current_Group = "UG";

            Working_Map := CandidateID_Maps.Empty_Map;
            Working_ID := 1;
            loop
                Working_Map.Insert (Working_ID, Candidate_Data.Element (Current_Index).Cand_ID);
                Working_ID := Working_ID + 1;
                Current_Index := Current_Index + 1;
                exit when Current_Index > Candidate_Data.Last_Index or else
                    Current_Group /= Candidate_Data.Element (Current_Index).Group;
            end loop;
            Result.Insert (Next_ID, Working_Map);
            Next_ID := Next_ID + 1;
        end loop;

        return Result;
    end Generate_Above;




    function Generate_Below
           (Candidate_Data : in Cand_Sort_Data_Vectors.Vector)
        return Below_Line_Ballot
    is
        Result : Below_Line_Ballot := CandidateID_Maps.Empty_Map;
        Next_ID : Positive := 1;
    begin
        for Item of Candidate_Data loop
            Result.Insert (Next_ID, Item.Cand_ID);
            Next_ID := Next_ID + 1;
        end loop;
        return Result;
    end Generate_Below;




    procedure Generate_Ballots
           (Candidate_Data : in     Candidate_Map;
            Above_Ballot   :    out Above_Line_Ballot;
            Below_Ballot   :    out Below_Line_Ballot)
    is
        package Sorting is new Cand_Sort_Data_Vectors.Generic_Sorting;

        My_Candidate_Data : Cand_Sort_Data_Vectors.Vector;
        Working_Candidate : Candidate;
    begin
        My_Candidate_Data := Cand_Sort_Data_Vectors.Empty_Vector;

        for Cursor in Candidate_Data.Iterate loop
            Working_Candidate := Candidate_Maps.Element (Cursor);
            My_Candidate_Data.Append
              ((Cand_ID    => Candidate_Maps.Key (Cursor),
                Group      => Working_Candidate.Group,
                Group_Rank => Working_Candidate.Group_Rank));
        end loop;

        Sorting.Sort (My_Candidate_Data);

        Above_Ballot := Generate_Above (My_Candidate_Data);
        Below_Ballot := Generate_Below (My_Candidate_Data);
    end Generate_Ballots;




    function To_String
           (Above_Ballot : in Above_Line_Ballot)
        return String
    is
        Result : SU.Unbounded_String := SU.To_Unbounded_String (0);
    begin
        for Group_Cursor in Above_Ballot.Iterate loop
            SU.Append (Result, Integer'Image (CandidateID_Map_Maps.Key (Group_Cursor)) & ": ");
            for Box of CandidateID_Map_Maps.Element (Group_Cursor) loop
                SU.Append (Result, CandidateID'Image (Box) & " ");
            end loop;
            SU.Append (Result, ASCII.LF);
        end loop;
        return SU.To_String (Result);
    end To_String;




    function To_String
           (Below_Ballot : in Below_Line_Ballot)
        return String
    is
        Result : SU.Unbounded_String := SU.To_Unbounded_String (0);
    begin
        for Box of Below_Ballot loop
            SU.Append (Result, CandidateID'Image (Box) & " ");
        end loop;
        return SU.To_String (Result);
    end To_String;


end Candidates.Containers;