#!/usr/bin/python3
'''Generate goofy composite material processing ideas.

Sometimes puts extra spaces inside paragraphs or chooses the same
ingredient twice.  Output isn't vaild Markdown.

'''
import random, textwrap

adhesives = '''
- PVA glue;
- epoxy resin and similar resin systems, if they don't attack the
  balloons;
- cyanoacrylate adhesive;
- plaster of Paris (thank you, Javier Candeira!);
- sodium silicate waterglass;
- slaked lime, if it doesn't attack the balloons or fibers;
- portland cement, if it doesn't attack the balloons or fibers and the
  color isn't a problem;
- calcium aluminate cement, if it doesn't attack the balloons or
  fibers, and refractoriness is desired;
- Sorel cement, if it doesn't attack the balloons or fibers, and
  maximal strength is desired;
- a so-called "geopolymer cement";
- latex paint;
- shellac;
- polyurethanes;
- urea-formaldehyde resin;
- phenolic resin;
- various kinds of solvent-based plastic cements such as PVC dissolved
  in acetone, if the solvent doesn't attack the balloons or fibers;
- clay, whether simply allowed to dry or later fired;
- tar, though probably using a solvent rather than heat;
- paraffin or other waxes, if the balloons can handle their melting
  temperatures;
- spray foam;
'''

fibers = '''
- nothing;
- heavily perforated paper;
- paper towels;
- cotton cloth, whether light like cotton tulle or heavy like canvas,
  and whether with a narrow weave like twill to maximize the strength
  of the fabric or a loose weave to ensure good adhesion between the
  adhesive on both sides of the fiber;
- burlap (aka Hessian), especially sisal or jute, to minimize cost and
  ensure good adhesion between the adhesive on both sides of the
  fiber;
- gauze, as in traditional plaster casts for broken bones (thank you,
  Javier Candeira!);
- mosquito netting;
- fiberglass cloth, as in traditional glass-reinforced polymer layups
  or in printed circuit boards, although if the binder is strongly
  basic you might need to use alkali-resistant fiberglass;
- carbon fiber;
- ceramic fiber like those used in refractory blankets and flocking,
  if resistance to high temperatures is desired (typically these
  fibers are mixes of mullite, alumina, zirconia, and silica);
- basalt fiber;
- steel window screens;
- aluminum or fiberglass window screens, if the binder is not strongly
  basic;
- stainless steel cloth;
- thicker and stronger metal reinforcement such as traditional rebar
  tie-ups, hardware cloth, chicken wire, or expanded sheet metal;
- copper wires;
- gel-spun ultra-high-molecular-weight polyethylene fibers;
'''

additives = '''
- pigments;
- quartz sand for extra strength;
- olivine or zircon sand for extra strength at higher temperatures;
- clay, such as bentonite, functionalized if necessary to bond well
  with the adhesive, in order to increase strength or decrease oxygen
  permeability;
- other soils, such as silt, as the lowest-cost fillers available;
- encapsulated air bubbles to reduce density, such as hollow
  microspheres of steel, glass, or plastic;
- vermiculite, perlite, pumice, or similar foamed minerals to reduce
  density;
- polystyrene foam beads or similar foamed plastic beads to reduce
  density;
- lead, bismuth, or steel particles to increase density;
- rubber particles to increase shock damping and reduce rigidity;
- graphite, amorphous carbon, or silicon carbide to increase
  electrical conductivity and/or heat resistance;
- donors of alkali metals and boron to reduce melting point and
  increase the thermal coefficient of expansion, for example to
  facilitate fire-glazing the surface afterwards — carbonates of
  sodium and potassium, boric acid, and borax are traditional here;
- foaming agents like baking powder;
- plasticizers like phthalate esters;
- chopped fibers, for example of basalt fiber or any of the other
  types mentioned earlier, or other fibers such as hair clippings,
  horsehair, paper fibers as in ordinary papier-mâché,
  sawdust or other wood fibers, grass clippings, used yerba mate,
  bamboo fibers, or straw;
- broken glass, for example for decorative purposes;
- abrasives, such as aluminum oxide or silicon carbide;
- pesticides such as copper chloride or blue vitriol to prevent
  biodegradation, for example by insects eating wheat paste and cotton
  fibers;
- UV blockers such as titanium dioxide to prevent photodegradation;
- additives to increase effective heat capacity, such as
  microencapsulated phase-change materials;
- milled mica, stainless steel, aluminum powder, or other glitters for
  a sparkly metallic appearance;
- catalysts;
- sodium polyacrylate or similar hygroscopic polymers to make the
  surface hygroscopic or cause changes in shape with environmental
  humidity;
'''

forms = '''
- 3-D printing;
- bending a wire armature;
- using an existing object such as a vase;
- blowing glass;
- vacuum-forming plastic;
- blow-molding plastic;
- electrotyping;
- modeling with clay or other modeling compounds;
- origami, whether with paper, sheets of PET or other plastic,
  aluminum foil, or other materials;
- commanding a motorized reusable "armature" to assume a certain
  position until the papier-mâché draped over it hardens;
- CNC machining;
- cutting, folding, and assembling shapes out of cardboard or MDF,
  though this requires special attention to the adhesive's water
  content;
- laser cutting;
- piling up sand or other soil, whether with an additional binder or
  not;
- assembling Legos, Meccano, Ramagon, Heckballs, modular T-slot
  aluminum framing, or other reusable "construction set" parts;
- building latticework structures out of other kinds of members, for
  example, metal trusses or Tensegrities like Kenneth Snelson's;
- manual carving of carveable materials such as metals, wood, foamed
  concrete, alabaster, graphite, lightweight refractory bricks, tuff,
  sandstone (natural or artificial), or papercrete;
- hot-wire cutting of fusible foams such as styrofoam or
  polyisocyanurate;
- inflatable shapes made in ways other than balloon twisting; for
  example, connecting sheets of polyethylene into a large balloon
  sculpture using a hot-wire heat-sealing machine;
- assembly of a variety of objects, for example with hot glue;
- forming sheet metal, for example by hammering, stamping,
  single-point incremental forming, or bead rolling;
- assembling panels or other shapes cut or otherwise shaped from
  closed-cell polymer foam or other materials;
- carpentry;
- basket weaving, whether from traditional materials such as bamboo
  and rattan or non-traditional materials such as Ethernet cable and
  sheet-metal strips;
- globoflexia
'''

def parse_items(s):
    return [' '.join(textwrap.wrap(item)) for item in s.split('\n- ')
            if item.strip()]

def format_list(items):
    return '\n'.join('- ' + '\n'.join(textwrap.wrap(item,
                                                    subsequent_indent='  '))
                     for item in items)

def select(item_string, termination_probability, min=1):
    items = parse_items(item_string)
    for _ in range(min):
        yield random.choice(items)
    while True:
        if random.random() <= termination_probability:
            return
        yield random.choice(items)

def choice():
    additive_list = format_list(select(additives, 0.7, min=0))
    additive_text = ('Additives:\n{}\n\n'.format(additive_list)
                     if additive_list else '')
    return 'Adhesives:\n{}\n\nFibers:\n{}\n\n{}Forms:\n{}\n'.format(
        format_list(select(adhesives, 0.9)),
        format_list(select(fibers, 0.9)),
        additive_text,
        format_list(select(forms, 0.9)))

def main():
    return '\n----\n\n'.join(choice() for _ in range(3))


if __name__ == '__main__':
    print(main())