from string import Template
import os.path
import os
from copy import deepcopy
import collections

# taken from https://stackoverflow.com/questions/6027558/flatten-nested-python-dictionaries-compressing-keys
def flatten(d, parent_key='', sep='_'):
    items = []
    for k, v in d.items():
        new_key = parent_key + sep + k if parent_key else k
        if isinstance(v, collections.MutableMapping):
            items.extend(flatten(v, new_key, sep=sep).items())
        else:
            items.append((new_key, v))
    return dict(items)

analysis_template = Template ('''
process ${id} {

    input:
    file fasta from for_${id}${chunks}

    output:
    file "$${fasta}.${id}.results" into ${id}_results

    script:
    """
    ${analysis_script} --fasta $$fasta --output $${fasta}.${id}.results ${analysis_params}
    """
}
''')
live_results_template = Template('''
process generate_${id}_live_results {

    publishDir "${output}/live", mode: 'copy', pattern: '*.*.json'

    input:
    file result from ${id}_json_live

    output:
    file "*.json" into ${id}_live_results

    script:
    """
    split_json_into_separate_files.py --json $$result --output . --tool ${id}
    """
}
''')
convert_live_template = Template ('''
process convert_${id}_to_json {

    input:
    file result from ${id}_results

    output:
    file "$${result}.json" into ${id}_json, ${id}_json_live

    script:
    """
    ${converter_script} --result $$result --output $${result}.json ${converter_params}
    """
}
''')
convert_info_template = Template ('''
process convert_${id}_to_json {

    input:
    file result from ${id}_results

    output:
    file "$${result}.json" into ${id}_json_info

    script:
    """
    ${converter_script} --result $$result --output $${result}.json ${converter_params}
    """
}
''')
convert_template = Template ('''
process convert_${id}_to_json {

    input:
    file result from ${id}_results

    output:
    file "$${result}.json" into ${id}_json

    script:
    """
    ${converter_script} --result $$result --output $${result}.json ${converter_params}
    """
}
''')
retrieve_informations_template = Template('''
process retrieve_informations_for_${id} {

    input:
    file result from ${id}_json_info

    output:
    file "$${result.baseName}_info.json" into ${id}_json

    script:
    """
    resolve_dbxrefs.py --input $$result --output $${result.baseName}_info.json
    """
}
''')
retrieve_informations_live_template = Template('''
process retrieve_informations_for_${id} {

    input:
    file result from ${id}_json_info

    output:
    file "$${result.baseName}_info.json" into ${id}_json, ${id}_json_live

    script:
    """
    resolve_dbxrefs.py --input $$result --output $${result.baseName}_info.json
    """
}
''')
input_template = Template('''file ${id}_result from ${id}_json.collect()''')
join_jsons_template = Template('''
process join_documents {

    input:
    ${inputs}

    output:
    file "joined.json" into joined_json

    script:
    """
    join_json_files.py --output joined.json *.json
    """
}
''')
split_jsons_template = Template('''
process split_documents {

    publishDir "${output}", mode: 'copy'

    input:
    file "input/json.json" from joined_json

    output:
    file "*.json" into result_documents

    script:
    """
    split_json_into_separate_files.py --json 'input/json.json' --output .
    """
}
''')
analysis_config_template = Template('''
    withName:${id}{
        executor = '${executor}'
        ${clusterOptions}
        ${beforeScript}
        ${container}
    }
    '''
    )
beforeScript_config_template = Template('''
    withName:${process_names}{
        ${beforeScript}
    }
    '''
    )

def setup_execution_directory(execution):
    directory = execution['directory']
    if not os.path.exists(directory):
        os.mkdir(directory)
    if not os.path.isdir(directory):
        exit()

    nextflow_script = generate_nextflow_script(execution)
    with open(directory + '/main.nf', 'w') as script_file:
        script_file.write(nextflow_script)
        
    nextflow_config = generate_nextflow_config(execution)
    with open(directory + '/nextflow.config', 'w') as config_file:
        config_file.write(nextflow_config)

    if not os.path.exists(directory + '/bin'):
        os.symlink(os.path.join(execution['install_path'], 'helpers'), directory + '/bin')
    #if not os.path.exists(directory + '/psot'):
    #    os.symlink(execution['psot_path'], directory + '/psot')

def execute_analysis(execution):
    old_cwd = os.getcwd()
    os.chdir(execution['directory'])
    os.system('nextflow run ' + execution['directory'] + '/main.nf --fasta ' + execution['fasta'] + ' --output ' + execution['output'])
    os.chdir(old_cwd)

def generate_nextflow_script(execution):
    modules = execution['modules']

    fragments = []
    fragments.append('''params.fasta = "'''+execution['fasta']+'''"
Channel.fromPath(params.fasta).set{fasta}''')
    target_channels = ["for_"+m['id'] for m in modules]
    fragments.append('fasta.into{'+';'.join(target_channels)+';}')

    for m in modules:
        config = flatten(m)
        config['output'] = execution['output']
        
        if execution['use_cluster']:
            config['chunks'] = ".splitFasta(by:300, file:'input')"
        else:
            config['chunks'] = ''

        fragments.append(analysis_template.substitute(config))
        if execution['mode'] == 'live' and not execution['fetch_informations']:
            fragments.append(convert_live_template.substitute(config))
            fragments.append(live_results_template.substitute(config))
        elif execution['mode'] == 'live' and execution['fetch_informations']:
            fragments.append(convert_info_template.substitute(config))
            fragments.append(retrieve_informations_live_template.substitute(config))
            fragments.append(live_results_template.substitute(config))
        elif execution['mode'] == 'complete' and execution['fetch_informations']:
          fragments.append(convert_info_template.substitute(config))
          fragments.append(retrieve_informations_template.substitute(config))
        else:
            fragments.append(convert_template.substitute(config))

    json_inputs = []
    for m in modules:
        json_inputs.append(input_template.substitute(m))

#   fragments.append(fetch_template.substitute(flatten(m)))
    fragments.append(join_jsons_template.substitute({'inputs': '\n    '.join(json_inputs)}))
    fragments.append(split_jsons_template.substitute(execution))

    nextflow_script = '\n'.join(fragments)
    return nextflow_script

def generate_nextflow_config(execution):
    modules = execution['modules']
    
    fragments = []
    fragments.append('''docker.enabled = true''')
    fragments.append('''process { ''')
            
    for m in modules:
        config = {}
        config['id'] = m['id']
        
        if m['analysis']['container']:
            config['container'] = "container = " + "'" + m['analysis']['container'] + "'"
        else:
            config['container'] = ''

        if execution['use_cluster']:
            config['executor'] = 'sge'
            config['clusterOptions'] = "clusterOptions = '-S /bin/bash'"
        else:
            config['executor'] = 'local'
            config['clusterOptions'] = ''
        
        if 'venv' in execution:
            config['beforeScript'] = "beforeScript = 'export PS1=; source " + execution['venv'] + "/bin/activate'"
            
            if execution['fetch_informations']:
                config['process_names'] = "'" + Template('convert_${id}_to_json|retrieve_informations_for_${id}').substitute(config) + "'"
            else:
                config['process_names'] = Template('convert_${id}_to_json').substitute(config)
                
            fragments.append(analysis_config_template.substitute(config))
            fragments.append(beforeScript_config_template.substitute(config))
        else:
            config['beforeScript'] = ''
            fragments.append(analysis_config_template.substitute(config))
        
    fragments.append('''}''')
    
    nextflow_config = '\n'.join(fragments)
    return nextflow_config