"""Create mesh and time boundary for the Okushiri island validation
"""

import numpy as num
from Scientific.IO.NetCDF import NetCDFFile

from anuga.pmesh.mesh import *
from anuga.coordinate_transforms.geo_reference import Geo_reference
from anuga.config import netcdf_float

import project


def prepare_timeboundary(filename):
    """Converting benchmark 2 time series to NetCDF tms file.
    This is a 'throw-away' code taylor made for files like
    'Benchmark_2_input.txt' from the LWRU2 benchmark
    """

    textversion = filename[:-4] + '.txt'

    print 'Preparing time boundary from %s' %textversion

    fid = open(textversion)

    #Skip first line
    line = fid.readline()

    #Read remaining lines
    lines = fid.readlines()
    fid.close()


    N = len(lines)
    T = num.zeros(N, num.float)  #Time
    Q = num.zeros(N, num.float)  #Values

    for i, line in enumerate(lines):
        fields = line.split()

        T[i] = float(fields[0])
        Q[i] = float(fields[1])


    #Create tms file
    print 'Writing to', filename
    fid = NetCDFFile(filename, 'w')

    fid.institution = 'Geoscience Australia'
    fid.description = 'Input wave for Benchmark 2'
    fid.starttime = 0.0
    fid.createDimension('number_of_timesteps', len(T))
    fid.createVariable('time', netcdf_float, ('number_of_timesteps',))
    fid.variables['time'][:] = T

    fid.createVariable('stage', netcdf_float, ('number_of_timesteps',))
    fid.variables['stage'][:] = Q[:]

    fid.createVariable('xmomentum', netcdf_float, ('number_of_timesteps',))
    fid.variables['xmomentum'][:] = 0.0

    fid.createVariable('ymomentum', netcdf_float, ('number_of_timesteps',))
    fid.variables['ymomentum'][:] = 0.0

    fid.close()


#-------------------------------------------------------------
if __name__ == "__main__":


    #Preparing points
    #(Only when using original Benchmark_2_Bathymetry.txt file)
    # FIXME: Replace by using geospatial data
    #
    #from anuga.abstract_2d_finite_volumes.data_manager import xya2pts
    #xya2pts(project.bathymetry_filename, verbose = True,
    #        z_func = lambda z: -z)


    # Prepare time boundary
    prepare_timeboundary(project.boundary_filename)


    # Create Mesh

    #Basic geometry
    
    xleft   = 0
    xright  = 5.448
    ybottom = 0
    ytop    = 3.402

    #Outline 
    point_sw = [xleft, ybottom]
    point_se = [xright, ybottom]
    point_nw = [xleft, ytop]    
    point_ne = [xright, ytop]

    #Midway points (left)
    point_mtop = [xleft + (xright-xleft)/3+1, ytop]
    point_mbottom = [xleft + (xright-xleft)/3+1, ybottom]


    geo = Geo_reference(xllcorner = xleft,
                        yllcorner = ybottom)
    
                        
    print "***********************"
    print "geo ref", geo
    print "***********************"
    
    m = Mesh(geo_reference=geo)

    #Boundary
    dict = {}
    dict['points'] = [point_se,   #se
                      point_ne,
                      point_mtop,
                      point_nw,
                      point_sw,
                      point_mbottom]

    
    dict['segments'] = [[0,1], [1,2], [2,3], [3,4],
                        [4,5], [5,0],  #The outer border
                        [2,5]]         #Separator
    
    dict['segment_tags'] = ['wall',
                            'wall',
                            'wall',
                            'wave',
                            'wall',
                            'wall',
                            '']           #Interior

        
    m.addVertsSegs(dict)





    #Localised refined area for gulleys
    dict = {}
    xl = 4.8
    xr = 5.3
    yb = 1.6
    yt = 2.3
    p0 = [xl, yb]
    p1 = [xr, yb]
    p2 = [xr, yt]
    p3 = [xl, yt]
    
    dict['points'] = [p0, p1, p2, p3]
    dict['segments'] = [[0,1], [1,2], [2,3], [3,0]]
    dict['segment_tags'] = ['', '', '', '']
    m.addVertsSegs(dict)    

    #Island area
    island_0 = [xleft + 2*(xright-xleft)/3+1.2, ytop-0.5]
    island_1 = [xleft + 2*(xright-xleft)/3+0.5, ybottom + 2*(ytop-ybottom)/3]
    island_2 = [xleft + (xright-xleft)/2+0.3, ybottom + 2*(ytop-ybottom)/3-0.3]
    island_3 = [xleft + (xright-xleft)/2+0.3, ybottom + (ytop-ybottom)/3+0.3]
    island_4 = [xleft + 2*(xright-xleft)/3+0.4, ybottom + (ytop-ybottom)/3-0.3] 
    island_5 = [xleft + 2*(xright-xleft)/3+1.2, ybottom+0.2]
    island_6 = [xl-.01, yb]  #OK
    island_7 = [xl-.01, yt]  #OK      
    

    dict['points'] = [island_0, island_1, island_2,
                      island_3, island_4, island_5,
                      #p0, p3]                      
                      island_6, island_7]

                      
    dict['segments'] = [[0,1], [1,2], [2,3], [3,4],
                        [4,5], [5,6], [6,7], [7,0]]
                        
    dict['segment_tags'] = ['', '', '', '', '', '', '', '']


    m.addVertsSegs(dict)    

    
#
    
    base_resolution = 1

    ocean = m.addRegionEN(xleft+.1, ybottom+.1)
    ocean.setMaxArea(0.1*base_resolution)

    mid = m.addRegionEN(point_mbottom[0]+.1, ybottom+.1)
    mid.setMaxArea(0.0005*base_resolution)
  

    #inner = m.addRegionEN(island_3[0]+.1, island_3[1]+.1)
    #inner.setMaxArea(0.00007*base_resolution)

    inner = m.addRegionEN(island_3[0]+.1, island_3[1]+.1)
    inner.setMaxArea(0.0003*base_resolution)    


    gulleys = m.addRegionEN(p0[0]+0.1, p0[1]+0.1)
    gulleys.setMaxArea(0.00003*base_resolution)


    # From r 1709 11 August 2005
    #base_resolution = 100
    #
    #ocean = m.addRegionEN(xleft+.1, ybottom+.1)
    #ocean.setMaxArea(0.01*base_resolution)
    #
    #mid = m.addRegionEN(point_mbottom[0]+.1, ybottom+.1)
    #mid.setMaxArea(0.001*base_resolution)

    #inner = m.addRegionEN(island_3[0]+.1, island_3[1]+.1)
    #inner.setMaxArea(0.0001*base_resolution)


    #gulleys = m.addRegionEN(p0[0]+0.1, p0[1]+0.1)
    #gulleys.setMaxArea(0.00001*base_resolution)        
    
    
    m.generateMesh('pzq28.0za1000000a')

    m.export_mesh_file(project.mesh_filename)