"""$ fio collect"""


from functools import partial
import json
import logging

import click
import cligj

from fiona.fio import helpers
from fiona.fio import options
from fiona.transform import transform_geom


@click.command(short_help="Collect a sequence of features.")
@cligj.precision_opt
@cligj.indent_opt
@cligj.compact_opt
@click.option('--record-buffered/--no-record-buffered', default=False,
              help="Economical buffering of writes at record, not collection "
              "(default), level.")
@click.option('--ignore-errors/--no-ignore-errors', default=False,
              help="log errors but do not stop serialization.")
@options.src_crs_opt
@click.option('--with-ld-context/--without-ld-context', default=False,
              help="add a JSON-LD context to JSON output.")
@click.option('--add-ld-context-item', multiple=True,
              help="map a term to a URI and add it to the output's JSON LD "
                   "context.")
@click.option('--parse/--no-parse', default=True,
              help="load and dump the geojson feature (default is True)")
@click.pass_context
def collect(ctx, precision, indent, compact, record_buffered, ignore_errors,
            src_crs, with_ld_context, add_ld_context_item, parse):
    """Make a GeoJSON feature collection from a sequence of GeoJSON
    features and print it."""
    verbosity = (ctx.obj and ctx.obj['verbosity']) or 2
    logger = logging.getLogger('fio')
    stdin = click.get_text_stream('stdin')
    sink = click.get_text_stream('stdout')

    dump_kwds = {'sort_keys': True}
    if indent:
        dump_kwds['indent'] = indent
    if compact:
        dump_kwds['separators'] = (',', ':')
    item_sep = compact and ',' or ', '

    if src_crs:
        if not parse:
            raise click.UsageError("Can't specify --src-crs with --no-parse")
        transformer = partial(transform_geom, src_crs, 'EPSG:4326',
                              antimeridian_cutting=True, precision=precision)
    else:
        transformer = lambda x: x

    first_line = next(stdin)

    # If parsing geojson
    if parse:
        # If input is RS-delimited JSON sequence.
        if first_line.startswith(u'\x1e'):
            def feature_text_gen():
                buffer = first_line.strip(u'\x1e')
                for line in stdin:
                    if line.startswith(u'\x1e'):
                        if buffer:
                            feat = json.loads(buffer)
                            feat['geometry'] = transformer(feat['geometry'])
                            yield json.dumps(feat, **dump_kwds)
                        buffer = line.strip(u'\x1e')
                    else:
                        buffer += line
                else:
                    feat = json.loads(buffer)
                    feat['geometry'] = transformer(feat['geometry'])
                    yield json.dumps(feat, **dump_kwds)
        else:
            def feature_text_gen():
                feat = json.loads(first_line)
                feat['geometry'] = transformer(feat['geometry'])
                yield json.dumps(feat, **dump_kwds)

                for line in stdin:
                    feat = json.loads(line)
                    feat['geometry'] = transformer(feat['geometry'])
                    yield json.dumps(feat, **dump_kwds)

    # If *not* parsing geojson
    else:
        # If input is RS-delimited JSON sequence.
        if first_line.startswith(u'\x1e'):
            def feature_text_gen():
                buffer = first_line.strip(u'\x1e')
                for line in stdin:
                    if line.startswith(u'\x1e'):
                        if buffer:
                            yield buffer
                        buffer = line.strip(u'\x1e')
                    else:
                        buffer += line
                else:
                    yield buffer
        else:
            def feature_text_gen():
                yield first_line
                for line in stdin:
                    yield line

    try:
        source = feature_text_gen()

        if record_buffered:
            # Buffer GeoJSON data at the feature level for smaller
            # memory footprint.
            indented = bool(indent)
            rec_indent = "\n" + " " * (2 * (indent or 0))

            collection = {
                'type': 'FeatureCollection',
                'features': []}
            if with_ld_context:
                collection['@context'] = helpers.make_ld_context(
                    add_ld_context_item)

            head, tail = json.dumps(collection, **dump_kwds).split('[]')

            sink.write(head)
            sink.write("[")

            # Try the first record.
            try:
                i, first = 0, next(source)
                if with_ld_context:
                    first = helpers.id_record(first)
                if indented:
                    sink.write(rec_indent)
                sink.write(first.replace("\n", rec_indent))
            except StopIteration:
                pass
            except Exception as exc:
                # Ignoring errors is *not* the default.
                if ignore_errors:
                    logger.error(
                        "failed to serialize file record %d (%s), "
                        "continuing",
                        i, exc)
                else:
                    # Log error and close up the GeoJSON, leaving it
                    # more or less valid no matter what happens above.
                    logger.critical(
                        "failed to serialize file record %d (%s), "
                        "quiting",
                        i, exc)
                    sink.write("]")
                    sink.write(tail)
                    if indented:
                        sink.write("\n")
                    raise

            # Because trailing commas aren't valid in JSON arrays
            # we'll write the item separator before each of the
            # remaining features.
            for i, rec in enumerate(source, 1):
                try:
                    if with_ld_context:
                        rec = helpers.id_record(rec)
                    if indented:
                        sink.write(rec_indent)
                    sink.write(item_sep)
                    sink.write(rec.replace("\n", rec_indent))
                except Exception as exc:
                    if ignore_errors:
                        logger.error(
                            "failed to serialize file record %d (%s), "
                            "continuing",
                            i, exc)
                    else:
                        logger.critical(
                            "failed to serialize file record %d (%s), "
                            "quiting",
                            i, exc)
                        sink.write("]")
                        sink.write(tail)
                        if indented:
                            sink.write("\n")
                        raise

            # Close up the GeoJSON after writing all features.
            sink.write("]")
            sink.write(tail)
            if indented:
                sink.write("\n")

        else:
            # Buffer GeoJSON data at the collection level. The default.
            collection = {
                'type': 'FeatureCollection',
                'features': []}
            if with_ld_context:
                collection['@context'] = helpers.make_ld_context(
                    add_ld_context_item)

            head, tail = json.dumps(collection, **dump_kwds).split('[]')
            sink.write(head)
            sink.write("[")
            sink.write(",".join(source))
            sink.write("]")
            sink.write(tail)
            sink.write("\n")

    except Exception:
        logger.exception("Exception caught during processing")
        raise click.Abort()
