package Finance::QuoteHist;

# Simple aggregator for Finance::QuoteHist::Generic instances,
# the primary function of which is to specify the order in which
# to try the modules upon failure.

use strict;
use vars qw($VERSION $AUTOLOAD);
use Carp;

use Finance::QuoteHist::Generic;

$VERSION = '1.32';

my @DEFAULT_ENGINES = qw(
  Finance::QuoteHist::Yahoo
);

sub new {
  my $class = shift;
  my %parms = @_;
  if (!$parms{lineup}) {
    $parms{lineup} = [@DEFAULT_ENGINES];
  }
  elsif (! ref $parms{lineup}) {
    $parms{lineup} = [$parms{lineup}];
  }
  elsif (ref $parms{lineup} ne 'ARRAY') {
    croak "Lineup must be passed as an array ref or single-entry string\n";
  }

  # Instantiate the first, pass the rest as champions to the first
  my $first = shift @{$parms{lineup}};

  eval "require $first";
  croak $@ if $@;

  my $self = $first->new(%parms);

  $self;
}

sub default_lineup { @DEFAULT_ENGINES }

sub granularities { Finance::QuoteHist::Generic->granularities }

1;
__END__

=head1 NAME

Finance::QuoteHist - Perl module for fetching historical stock quotes.

=head1 SYNOPSIS

  use Finance::QuoteHist;
  $q = Finance::QuoteHist->new
     (
      symbols    => [qw(IBM UPS AMZN)],
      start_date => '01/01/2009', # or '1 year ago', see Date::Manip
      end_date   => 'today',
     );

  # Quotes
  foreach $row ($q->quotes()) {
    ($symbol, $date, $open, $high, $low, $close, $volume) = @$row;
    ...
  }

  # Splits
  foreach $row ($q->splits()) {
     ($symbol, $date, $post, $pre) = @$row;
  }

  # Dividends
  foreach $row ($q->dividends()) {
     ($symbol, $date, $dividend) = @$row;
  }

  # Culprit
  $fetch_class = $q->quote_source('IBM');

=head1 DESCRIPTION

Finance::QuoteHist is a top level interface for fetching historical
stock quotes from the web.

It is actually a front end to modules based on
Finance::QuoteHist::Generic, the main difference being that it has a
default I<lineup> of web sites from which to attempt quote retrieval. If
the prospect of mixing data from multiple sites seems scary to you, then
use one of the site-specific modules directly.

Unless otherwise defined via the I<lineup> attribute, this module will
select a I<lineup> for you, the default being:

    Finance::QutoeHist::Yahoo
    Finance::QutoeHist::Google

Once instantiated, this module behaves identically to the first module
in the I<lineup>, sharing all of that module's methods.

Most queries will likely be handled by the first module in the lineup.
If the site is down for some reason, or perhaps that site does not
provide quotes for defunct ticker symbols, then the other sites in the
lineup will be attempted.

See L<Finance::QuoteHist::Generic(3)> for gory details on all of the
parameters and methods this module accepts. The basic interface is
noted below.

=head1 METHODS

The basic user interface consists of several methods, as seen in the
example above. Those methods are:

=over

=item quotes()

Returns a list of rows (or a reference to an array containing those
rows, if in scalar context). Each row contains the B<Symbol>, B<Date>,
B<Open>, B<High>, B<Low>, B<Close>, and B<Volume> for that date.
Optionally, if non-adjusted values were requested, their will be an
extra element at the end of the row for the B<Adjusted> closing price.

=item dividends()

Returns a list of rows (or a reference to an array containing those
rows, if in scalar context). Each row contains the B<Date> and amount of
the B<Dividend>, in that order.

=item splits()

Returns a list of rows (or a reference to an array containing those
rows, if in scalar context). Each row contains the B<Date>, B<Post>
split shares, and B<Pre> split shares, in that order.

=item source($ticker, $target)

Each of these methods displays which site-specific class actually
retrieved the information, if any, for a particular ticker symbol and
target such as 'quote' (default), 'dividend', or 'split'.

=back

=head1 DISCLAIMER

The data returned from these modules is in no way guaranteed, nor are
the developers responsible in any way for how this data (or lack
thereof) is used. The interface is based on URLs and page layouts that
might change at any time. Even though these modules are designed to be
adaptive under these circumstances, they will at some point probably be
unable to retrieve data unless fixed or provided with new parameters.
Furthermore, the data from these web sites is usually not even
guaranteed by the web sites themselves, and oftentimes is acquired
elsewhere. See the documentation for each site-specific module for more
information regarding the disclaimer for that site.

=head1 AUTHOR

Matthew P. Sisk, E<lt>F<sisk@mojotoad.com>E<gt>

=head1 COPYRIGHT

Copyright (c) 2000-2021 Matthew P. Sisk. All rights reserved. All wrongs
revenged. This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

=head1 SEE ALSO

Finance::QuoteHist::Generic(3), Finance::QuoteHist::Yahoo(3), perl(1).

=cut
