"""Script for running a dam break simulation of UQ's dam break tank.

The simulation is based on the simulation Matt has presented and will
form part of the ANUGA validation paper.

i want to compare the stage at .4m and the velocity at .45m.


Ole Nielsen and Duncan Gray, GA - 2006 
"""


#----------------------------------------------------------------------------
# Import necessary modules
#----------------------------------------------------------------------------

# Standard modules
import time
import sys
from shutil import copy
from os import path

# Related major packages
from anuga.shallow_water import Domain, Reflective_boundary, \
                            Dirichlet_boundary, Time_boundary, File_boundary
from anuga.abstract_2d_finite_volumes.region import Set_region 
from anuga.fit_interpolate.interpolate import interpolate_sww2csv
from anuga.abstract_2d_finite_volumes.util import start_screen_catcher, \
     copy_code_files
import create_mesh

import project


# Application specific imports


def main():
     
    slope= 0
    friction = 0.01 
    inital_depth = 0.2
    gate_position = 0.75
   
    return scenario(slope, friction, inital_depth, gate_position)
            

def scenario(slope, friction, inital_depth, gate_position):

    #-------------------------------------------------------------------------
    # Create the triangular mesh
    #-------------------------------------------------------------------------

    create_mesh.generate(project.mesh_filename,
                         gate_position,
                         #is_course=True) # this creates the mesh
                         is_course=False) # this creates the mesh

    head,tail = path.split(project.mesh_filename)
    #-------------------------------------------------------------------------
    # Setup computational domain
    #-------------------------------------------------------------------------
    domain = Domain(project.mesh_filename, use_cache = False, verbose = True)
   

    print 'Number of triangles = ', len(domain)
    print 'The extent is ', domain.get_extent()
    print domain.statistics()

    
    domain.set_name(project.basename)
    domain.set_datadir('.')
    domain.set_quantities_to_be_stored(['stage', 'xmomentum', 'ymomentum'])
    domain.set_minimum_storable_height(0.001)
    domain.set_store_vertices_uniquely(True)  # for writting to sww

    #-------------------------------------------------------------------------
    # Setup initial conditions
    #-------------------------------------------------------------------------


    def elevation_tilt(x, y):
        return x*slope
        
    domain.set_quantity('stage', elevation_tilt)
    domain.set_quantity('friction', friction) 
    domain.set_quantity('elevation',elevation_tilt)

    print 'Available boundary tags', domain.get_boundary_tags()
    domain.set_region('dam','stage',inital_depth,
                                 location = 'unique vertices') 

    Br = Reflective_boundary(domain)
    Bd = Dirichlet_boundary([0,0,0])  # to drain the water out.
    domain.set_boundary( {'wall': Br, 'edge': Bd} )

    #-------------------------------------------------------------------------
    # Evolve system through time
    #-------------------------------------------------------------------------
    t0 = time.time()

    for t in domain.evolve(yieldstep = 0.1, finaltime = 10): #enter timestep and final time
        domain.write_time()
    
        print 'That took %.2f seconds' %(time.time()-t0)
        print 'finished'
        
    points = [[0.4,0.2], [0.45,0.2]]
    #-------------------------------------------------------------------------
    # Calculate gauge info
    #-------------------------------------------------------------------------
    print "name",project.basename +".sww"
    interpolate_sww2csv( project.basename +".sww",
                        points,
                        project.depth_filename ,
                        project.velocity_x_filename,
                        project.velocity_y_filename )


#-------------------------------------------------------------
if __name__ == "__main__":
    main()