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#!/usr/bin/env python
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# Maps one datasource to another, using a map spreadsheet if needed
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# Exit status is the # of errors in the import, up to the maximum exit status
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# For outputting an XML file to a PostgreSQL database, use the general format of
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# http://vegbank.org/vegdocs/xml/vegbank_example_ver1.0.2.xml
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import csv
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import itertools
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import os.path
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import sys
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import xml.dom.minidom as minidom
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sys.path.append(os.path.dirname(__file__)+"/../lib")
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import csvs
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import exc
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import iters
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import maps
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import opts
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import parallel
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import Parser
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import profiling
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import sql
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import streams
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import strings
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import term
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import util
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import xpath
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import xml_dom
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import xml_func
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import xml_parse
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def get_with_prefix(map_, prefixes, key):
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    '''Gets all entries for the given key with any of the given prefixes'''
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    values = []
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    for key_ in strings.with_prefixes(['']+prefixes, key): # also with no prefix
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        try: value = map_[key_]
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        except KeyError, e: continue # keep going
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        values.append(value)
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    if values != []: return values
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    else: raise e # re-raise last KeyError
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def metadata_value(name): return None # this feature has been removed
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def cleanup(val):
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    if val == None: return val
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    return util.none_if(strings.cleanup(strings.ustr(val)), u'', u'\\N')
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def main_():
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    env_names = []
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    def usage_err():
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        raise SystemExit('Usage: '+opts.env_usage(env_names, True)+' '
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            +sys.argv[0]+' [map_path...] [<input] [>output]\n'
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            'Note: Row #s start with 1')
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    ## Get config from env vars
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    # Modes
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    test = opts.env_flag('test', False, env_names)
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    commit = opts.env_flag('commit', False, env_names) and not test
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        # never commit in test mode
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    redo = opts.env_flag('redo', test, env_names) and not commit
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        # never redo in commit mode (manually run `make empty_db` instead)
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    # Ranges
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    start = util.cast(int, opts.get_env_var('start', 1, env_names)) # 1-based
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    # Make start interally 0-based.
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    # It's 1-based to the user to match up with the staging table row #s.
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    start -= 1
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    if test: n_default = 1
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    else: n_default = None
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    n = util.cast(int, util.none_if(opts.get_env_var('n', n_default, env_names),
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        u''))
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    end = n
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    if end != None: end += start
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    # Debugging
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    debug = opts.env_flag('debug', False, env_names)
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    sql.run_raw_query.debug = debug
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    verbose = debug or opts.env_flag('verbose', not test, env_names)
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    opts.get_env_var('profile_to', None, env_names) # add to env_names
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    # DB
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    def get_db_config(prefix):
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        return opts.get_env_vars(sql.db_config_names, prefix, env_names)
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    in_db_config = get_db_config('in')
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    out_db_config = get_db_config('out')
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    in_is_db = 'engine' in in_db_config
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    out_is_db = 'engine' in out_db_config
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    in_schema = opts.get_env_var('in_schema', None, env_names)
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    in_table = opts.get_env_var('in_table', None, env_names)
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    # Optimization
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    by_col = in_db_config == out_db_config and opts.env_flag('by_col', False,
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        env_names) # by-column optimization only applies if mapping to same DB
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    if test: cpus_default = 0
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    else: cpus_default = None
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    cpus = util.cast(int, util.none_if(opts.get_env_var('cpus', cpus_default,
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        env_names), u''))
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    ##
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    # Logging
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    def log(msg, on=verbose):
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        if on: sys.stderr.write(msg+'\n')
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    if debug: log_debug = lambda msg: log(msg, debug)
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    else: log_debug = sql.log_debug_none
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    # Parse args
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    map_paths = sys.argv[1:]
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    if map_paths == []:
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        if in_is_db or not out_is_db: usage_err()
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        else: map_paths = [None]
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    def connect_db(db_config):
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        log('Connecting to '+sql.db_config_str(db_config))
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        return sql.connect(db_config, log_debug=log_debug)
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    if end != None: end_str = str(end-1) # end is one past the last #
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    else: end_str = 'end'
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    log('Processing input rows '+str(start)+'-'+end_str)
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    ex_tracker = exc.ExPercentTracker(iter_text='row')
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    profiler = profiling.ItersProfiler(start_now=True, iter_text='row')
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    # Parallel processing
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    pool = parallel.MultiProducerPool(cpus)
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    log('Using '+str(pool.process_ct)+' parallel CPUs')
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    doc = xml_dom.create_doc()
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    root = doc.documentElement
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    out_is_xml_ref = [False]
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    in_label_ref = [None]
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    def update_in_label():
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        if in_label_ref[0] != None:
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            xpath.get(root, '/_ignore/inLabel="'+in_label_ref[0]+'"', True)
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    def prep_root():
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        root.clear()
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        update_in_label()
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    prep_root()
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    # Define before the out_is_db section because it's used by by_col
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    row_ins_ct_ref = [0]
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    def process_input(root, row_ready, map_path):
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        '''Inputs datasource to XML tree, mapping if needed'''
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        # Load map header
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        in_is_xpaths = True
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        out_is_xpaths = True
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        out_label = None
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        if map_path != None:
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            metadata = []
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            mappings = []
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            stream = open(map_path, 'rb')
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            reader = csv.reader(stream)
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            in_label, out_label = reader.next()[:2]
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            def split_col_name(name):
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                label, sep, root = name.partition(':')
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                label, sep2, prefixes_str = label.partition('[')
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                prefixes_str = strings.remove_suffix(']', prefixes_str)
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                prefixes = strings.split(',', prefixes_str)
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                return label, sep != '', root, prefixes
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                    # extract datasrc from "datasrc[data_format]"
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            in_label, in_root, prefixes = maps.col_info(in_label)
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            in_is_xpaths = in_root != None
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            in_label_ref[0] = in_label
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            update_in_label()
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            out_label, out_root = maps.col_info(out_label)[:2]
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            out_is_xpaths = out_root != None
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            if out_is_xpaths: has_types = out_root.find('/*s/') >= 0
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                # outer elements are types
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            for row in reader:
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                in_, out = row[:2]
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                if out != '':
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                    if out_is_xpaths: out = xpath.parse(out_root+out)
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                    mappings.append((in_, out))
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            stream.close()
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            root.ownerDocument.documentElement.tagName = out_label
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        in_is_xml = in_is_xpaths and not in_is_db
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        out_is_xml_ref[0] = out_is_xpaths and not out_is_db
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        def process_rows(process_row, rows, rows_start=0):
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            '''Processes input rows      
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            @param process_row(in_row, i)
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            @rows_start The (0-based) row # of the first row in rows. Set this
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                only if the pre-start rows have already been skipped.
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            '''
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            rows = iter(rows)
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            if end != None: row_nums = xrange(rows_start, end)
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            else: row_nums = itertools.count(rows_start)
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            for i in row_nums:
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                try: row = rows.next()
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                except StopIteration: break # no more rows
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                if i < start: continue # not at start row yet
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                process_row(row, i)
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                row_ready(i, row)
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            row_ct = i-start
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            return row_ct
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        def map_rows(get_value, rows, **kw_args):
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            '''Maps input rows
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            @param get_value(in_, row):str
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            '''
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            def process_row(row, i):
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                row_id = str(i)
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                for in_, out in mappings:
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                    value = metadata_value(in_)
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                    if value == None:
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                        log_debug('Getting '+str(in_))
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                        value = cleanup(get_value(in_, row))
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                    if value != None:
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                        log_debug('Putting '+str(out))
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                        xpath.put_obj(root, out, row_id, has_types, value)
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            return process_rows(process_row, rows, **kw_args)
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        def map_table(col_names, rows, **kw_args):
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            col_names_ct = len(col_names)
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            col_idxs = util.list_flip(col_names)
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            i = 0
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            while i < len(mappings): # mappings len changes in loop
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                in_, out = mappings[i]
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                if metadata_value(in_) == None:
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                    try: mappings[i] = (
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                        get_with_prefix(col_idxs, prefixes, in_), out)
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                    except KeyError:
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                        del mappings[i]
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                        continue # keep i the same
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                i += 1
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            def get_value(in_, row):
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                return util.coalesce(*util.list_subset(row.list, in_))
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            def wrap_row(row):
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                return util.ListDict(util.list_as_length(row, col_names_ct),
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                    col_names, col_idxs) # handle CSV rows of different lengths
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            return map_rows(get_value, util.WrapIter(wrap_row, rows), **kw_args)
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        stdin = streams.LineCountStream(sys.stdin)
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        def on_error(e):
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            exc.add_msg(e, term.emph('input line #:')+' '+str(stdin.line_num))
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            ex_tracker.track(e)
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        if in_is_db:
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            in_db = connect_db(in_db_config)
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            # Get table and schema name
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            schema = in_schema # modified, so can't have same name as outer var
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            table = in_table # modified, so can't have same name as outer var
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            if table == None:
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                assert in_is_xpaths
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                schema, sep, table = in_root.partition('.')
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                if sep == '': # only the table name was specified
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                    table = schema
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                    schema = None
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            table_is_esc = False
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            if schema != None:
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                table = sql.qual_name(in_db, schema, table)
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                table_is_esc = True
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            # Fetch rows
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            if by_col: limit = 0 # only fetch column names
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            else: limit = n
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            cur = sql.select(in_db, table, limit=limit, start=start,
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                table_is_esc=table_is_esc)
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            col_names = list(sql.col_names(cur))
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            if by_col:
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                row_ready = lambda row_num, input_row: None# disable row_ready()
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                row = ['$'+v for v in col_names] # values are the column names
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                map_table(col_names, [row]) # map just the sample row
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                xml_func.strip(root)
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                db_xml.put_table(in_db, root.firstChild, table, commit,
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                    row_ins_ct_ref, table_is_esc)
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            else:
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                # Use normal by-row method
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                row_ct = map_table(col_names, sql.rows(cur), rows_start=start)
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                    # rows_start: pre-start rows have been skipped
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            in_db.db.close()
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        elif in_is_xml:
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            def get_rows(doc2rows):
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                return iters.flatten(itertools.imap(doc2rows,
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                    xml_parse.docs_iter(stdin, on_error)))
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            if map_path == None:
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                def doc2rows(in_xml_root):
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                    iter_ = xml_dom.NodeElemIter(in_xml_root)
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                    util.skip(iter_, xml_dom.is_text) # skip metadata
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                    return iter_
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                row_ct = process_rows(lambda row, i: root.appendChild(row),
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                    get_rows(doc2rows))
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            else:
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                def doc2rows(in_xml_root):
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                    rows = xpath.get(in_xml_root, in_root, limit=end)
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                    if rows == []: raise SystemExit('Map error: Root "'
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                        +in_root+'" not found in input')
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                    return rows
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                def get_value(in_, row):
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                    in_ = './{'+(','.join(strings.with_prefixes(
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                        ['']+prefixes, in_)))+'}' # also with no prefix
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                    nodes = xpath.get(row, in_, allow_rooted=False)
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                    if nodes != []: return xml_dom.value(nodes[0])
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                    else: return None
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                row_ct = map_rows(get_value, get_rows(doc2rows))
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        else: # input is CSV
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            map_ = dict(mappings)
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            reader, col_names = csvs.reader_and_header(sys.stdin)
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            row_ct = map_table(col_names, reader)
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        return row_ct
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    def process_inputs(root, row_ready):
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        row_ct = 0
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        for map_path in map_paths:
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            row_ct += process_input(root, row_ready, map_path)
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        return row_ct
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    pool.share_vars(locals())
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    if out_is_db:
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        import db_xml
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        out_db = connect_db(out_db_config)
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        try:
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            if redo: sql.empty_db(out_db)
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            pool.share_vars(locals())
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            def row_ready(row_num, input_row):
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                def on_error(e):
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                    exc.add_msg(e, term.emph('row #:')+' '+str(row_num+1))
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                        # row # is interally 0-based, but 1-based to the user
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                    exc.add_msg(e, term.emph('input row:')+'\n'+str(input_row))
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                    exc.add_msg(e, term.emph('output row:')+'\n'+str(root))
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                    ex_tracker.track(e, row_num)
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                pool.share_vars(locals())
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                xml_func.process(root, on_error)
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                if not xml_dom.is_empty(root):
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                    assert xml_dom.has_one_child(root)
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                    try:
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                        sql.with_savepoint(out_db,
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                            lambda: db_xml.put(out_db, root.firstChild,
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                                row_ins_ct_ref, on_error))
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                        if commit: out_db.db.commit()
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                    except sql.DatabaseErrors, e: on_error(e)
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                prep_root()
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            row_ct = process_inputs(root, row_ready)
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            sys.stdout.write('Inserted '+str(row_ins_ct_ref[0])+
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                ' new rows into database\n')
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            # Consume asynchronous tasks
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            pool.main_loop()
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        finally:
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            out_db.db.rollback()
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            out_db.db.close()
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    else:
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        def on_error(e): ex_tracker.track(e)
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        def row_ready(row_num, input_row): pass
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        row_ct = process_inputs(root, row_ready)
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        xml_func.process(root, on_error)
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        if out_is_xml_ref[0]:
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            doc.writexml(sys.stdout, **xml_dom.prettyxml_config)
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        else: # output is CSV
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            raise NotImplementedError('CSV output not supported yet')
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    # Consume any asynchronous tasks not already consumed above
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    pool.main_loop()
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    profiler.stop(row_ct)
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    ex_tracker.add_iters(row_ct)
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    if verbose:
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        sys.stderr.write('Processed '+str(row_ct)+' input rows\n')
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        sys.stderr.write(profiler.msg()+'\n')
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        sys.stderr.write(ex_tracker.msg()+'\n')
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    ex_tracker.exit()
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def main():
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    try: main_()
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    except Parser.SyntaxError, e: raise SystemExit(str(e))
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if __name__ == '__main__':
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    profile_to = opts.get_env_var('profile_to', None)
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    if profile_to != None:
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        import cProfile
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        sys.stderr.write('Profiling to '+profile_to+'\n')
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        cProfile.run(main.func_code, profile_to)
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    else: main()
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