CREATE OR REPLACE PACKAGE BODY app_actions AS

    PROCEDURE nav_remove_pages (
        in_page_id              navigation.page_id%TYPE         := NULL
    )
    AS
    BEGIN
        app.log_module(in_page_id);

        -- remove references
        FOR c IN (
            SELECT n.app_id, n.page_id
            FROM navigation n
            JOIN nav_pages_to_remove p
                ON p.page_id        = n.parent_id
                AND n.page_id       = NVL(in_page_id, n.page_id)
            WHERE n.app_id          = app.get_app_id()
        ) LOOP
            app.log_debug('REMOVING_PARENT', c.page_id);
            --
            UPDATE navigation n
            SET n.parent_id         = NULL
            WHERE n.app_id          = c.app_id
                AND n.page_id       = c.page_id;
        END LOOP;

        -- remove rows for pages which dont exists
        FOR c IN (
            SELECT p.page_id
            FROM nav_pages_to_remove p
            WHERE p.page_id         = NVL(in_page_id, p.page_id)
        ) LOOP
            app.log_debug('DELETING', c.page_id);
            --
            DELETE FROM navigation n
            WHERE n.app_id          = app.get_app_id()
                AND n.page_id       = c.page_id;
        END LOOP;
        --
        app.log_success();
    END;



    PROCEDURE nav_add_pages (
        in_page_id              navigation.page_id%TYPE         := NULL
    )
    AS
        rec         navigation%ROWTYPE;
    BEGIN
        app.log_module(in_page_id);

        -- add pages which are present in APEX but missing in Navigation table
        FOR c IN (
            SELECT n.*
            FROM nav_pages_to_add n
            WHERE n.page_id = NVL(in_page_id, n.page_id)
        ) LOOP
            app.log_debug('ADDING', c.page_id);
            --
            rec.app_id      := c.app_id;
            rec.page_id     := c.page_id;
            rec.parent_id   := c.parent_id;
            rec.order#      := c.order#;
            rec.is_hidden   := c.is_hidden;
            rec.is_reset    := c.is_reset;
            --
            INSERT INTO navigation VALUES rec;
        END LOOP;
        --
        app.log_success();
    END;



    PROCEDURE nav_autoupdate
    AS
    BEGIN
        app.log_module();
        --
        nav_remove_pages();
        nav_add_pages();
        --
        app.log_success();
    END;



    FUNCTION get_role_name (
        in_role_id              roles.role_id%TYPE
    )
    RETURN roles.role_name%TYPE
    AS
        out_name                roles.role_name%TYPE;
    BEGIN
        SELECT NVL(r.role_name, r.role_id) INTO out_name
        FROM roles r
        WHERE r.app_id          = app.get_app_id()
            AND r.role_id       = in_role_id;
        --
        RETURN out_name;
    EXCEPTION
    WHEN NO_DATA_FOUND THEN
        RETURN in_role_id;
    END;



    PROCEDURE prep_user_roles_pivot (
        in_page_id              apex_application_pages.page_id%TYPE
    ) AS
        in_collection           CONSTANT apex_collections.collection_name%TYPE := 'P' || TO_CHAR(in_page_id);
        --
        v_query                 VARCHAR2(32767);
        v_cols                  PLS_INTEGER;
        v_cursor                PLS_INTEGER                 := DBMS_SQL.OPEN_CURSOR;
        v_desc                  DBMS_SQL.DESC_TAB;
    BEGIN
        -- build query
        v_query := v_query || 'SELECT' || CHR(10) || '    u.user_id,';
        --
        FOR r IN (
            SELECT r.role_id
            FROM roles r
            WHERE r.app_id = app.get_app_id()
            ORDER BY r.role_group NULLS LAST, r.order# NULLS LAST, r.role_id
        ) LOOP
            v_query := v_query || CHR(10) || '    MAX(CASE WHEN r.role_id = ''' || r.role_id || ''' THEN ''Y'' END) AS ' || LOWER(r.role_id) || '_, ';
        END LOOP;
        --
        v_query := RTRIM(v_query, ', ') || CHR(10) || 'FROM users u LEFT JOIN user_roles r ON r.app_id = app.get_app_id() AND r.user_id = u.user_id' || CHR(10) || 'GROUP BY u.user_id';
        --
        DBMS_OUTPUT.PUT_LINE(v_query);

        -- initialize and populate collection
        IF APEX_COLLECTION.COLLECTION_EXISTS(in_collection) THEN
            APEX_COLLECTION.DELETE_COLLECTION(in_collection);
        END IF;
        --
        APEX_COLLECTION.CREATE_COLLECTION_FROM_QUERY (
            p_collection_name   => in_collection,
            p_query             => v_query
        );

        -- pass proper column names via page items
        DBMS_SQL.PARSE(v_cursor, v_query, DBMS_SQL.NATIVE);
        DBMS_SQL.DESCRIBE_COLUMNS(v_cursor, v_cols, v_desc);
        DBMS_SQL.CLOSE_CURSOR(v_cursor);
        --
        FOR i IN 1 .. v_desc.COUNT LOOP
            BEGIN
                APEX_UTIL.SET_SESSION_STATE (
                    p_name      => 'P' || in_page_id || '_C' || LPAD(i, 3, 0),
                    p_value     => get_role_name(RTRIM(v_desc(i).col_name, '_')),
                    p_commit    => FALSE
                );
            EXCEPTION
            WHEN OTHERS THEN
                NULL;           -- item might not exists
            END;
        END LOOP;
    END;

END;
/