<?php

namespace Wavelog\Dxcc;

class Dxcc {
	protected $dxcc = array();
	protected $dxccexceptions = array();

	function __construct($date)
	{
		$this->read_data($date);
	}

	public function dxcc_lookup($call, $date) {

		$csadditions = '/^P$|^R$|^A$|^B$|^M$/';
		$CI =& get_instance();

		if (array_key_exists($call, $this->dxccexceptions)) {
			return $this->dxccexceptions[$call];
        } else {

			if (preg_match('/(^KG4)[A-Z09]{3}/', $call)) {       // KG4/ and KG4 5 char calls are Guantanamo Bay. If 4 or 6 char, it is USA
				$call = "K";
			} elseif (preg_match('/(^OH\/)|(\/OH[1-9]?$)/', $call)) {   # non-Aland prefix!
				$call = "OH";                                             # make callsign OH = finland
			} elseif (preg_match('/(^CX\/)|(\/CX[1-9]?$)/', $call)) {   # non-Antarctica prefix!
				$call = "CX";                                             # make callsign CX = Uruguay
			} elseif (preg_match('/(^3D2R)|(^3D2.+\/R)/', $call)) {     # seems to be from Rotuma
				$call = "3D2/R";                                          # will match with Rotuma
			} elseif (preg_match('/^3D2C/', $call)) {                   # seems to be from Conway Reef
				$call = "3D2/C";                                          # will match with Conway
			} elseif (preg_match('/(^LZ\/)|(\/LZ[1-9]?$)/', $call)) {   # LZ/ is LZ0 by DXCC but this is VP8h
				$call = "LZ";
			} elseif (preg_match('/(^KG4)[A-Z09]{2}/', $call)) {
				$call = "KG4";
			} elseif (preg_match('/(^KG4)[A-Z09]{1}/', $call)) {
				$call = "K";
			} elseif (preg_match('/\w\/\w/', $call)) {
				if (preg_match_all('/^((\d|[A-Z])+\/)?((\d|[A-Z]){3,})(\/(\d|[A-Z])+)?(\/(\d|[A-Z])+)?$/', $call, $matches)) {
					$prefix = $matches[1][0];
					$callsign = $matches[3][0];
					$suffix = $matches[5][0];
					if ($prefix) {
						$prefix = substr($prefix, 0, -1); # Remove the / at the end
					}
					if ($suffix) {
						$suffix = substr($suffix, 1); # Remove the / at the beginning
					};
					if (preg_match($csadditions, $suffix)) {
						if ($prefix) {
							$call = $prefix;
						} else {
							$call = $callsign;
						}
					} else {
						$result = $this->wpx($call, 1);                       # use the wpx prefix instead
						if ($result == '') {
							$row['adif'] = 0;
							$row['entity'] = '- NONE -';
							$row['cqz'] = 0;
							$row['long'] = '0';
							$row['lat'] = '0';
							return $row;
						} else {
							$call = $result . "AA";
						}
					}
				}
			}

			$len = strlen($call);

			// query the table, removing a character from the right until a match
			for ($i = $len; $i > 0; $i--){
				$result = '';

				if (array_key_exists(substr($call, 0, $i), $this->dxcc)) {
					return $this->dxcc[substr($call, 0, $i)];
				}
			}
		}

		return array("Not Found", "Not Found");
	}

	function wpx($testcall, $i) {
		$prefix = '';
		$a = '';
		$b = '';
		$c = '';

		$lidadditions = '/^QRP$|^LGT$/';
		$csadditions = '/^P$|^R$|^B$|^A$|^M$|^LH$/';
		$noneadditions = '/^MM$|^AM$/';

		# First check if the call is in the proper format, A/B/C where A and C
		# are optional (prefix of guest country and P, MM, AM etc) and B is the
		# callsign. Only letters, figures and "/" is accepted, no further check if the
		# callsign "makes sense".
		# 23.Apr.06: Added another "/X" to the regex, for calls like RV0AL/0/P
		# as used by RDA-DXpeditions....

		if (preg_match_all('/^((\d|[A-Z])+\/)?((\d|[A-Z]){3,})(\/(\d|[A-Z])+)?(\/(\d|[A-Z])+)?$/', $testcall, $matches)) {

			# Now $1 holds A (incl /), $3 holds the callsign B and $5 has C
			# We save them to $a, $b and $c respectively to ensure they won't get
			# lost in further Regex evaluations.
			$a = $matches[1][0];
			$b = $matches[3][0];
			$c = $matches[5][0];

			if ($a) {
				$a = substr($a, 0, -1); # Remove the / at the end
			}
			if ($c) {
				$c = substr($c, 1); # Remove the / at the beginning
			};

			# In some cases when there is no part A but B and C, and C is longer than 2
			# letters, it happens that $a and $b get the values that $b and $c should
			# have. This often happens with liddish callsign-additions like /QRP and
			# /LGT, but also with calls like DJ1YFK/KP5. ~/.yfklog has a line called
			# "lidadditions", which has QRP and LGT as defaults. This sorts out half of
			# the problem, but not calls like DJ1YFK/KH5. This is tested in a second
			# try: $a looks like a call (.\d[A-Z]) and $b doesn't (.\d), they are
			# swapped. This still does not properly handle calls like DJ1YFK/KH7K where
			# only the OP's experience says that it's DJ1YFK on KH7K.
			if (!$c && $a && $b) {                          # $a and $b exist, no $c
				if (preg_match($lidadditions, $b)) {        # check if $b is a lid-addition
					$b = $a;
					$a = null;                              # $a goes to $b, delete lid-add
				} elseif ((preg_match('/\d[A-Z]+$/', $a)) && (preg_match('/\d$/', $b))) {   # check for call in $a
					$temp = $b;
					$b = $a;
					$a = $temp;
				}
			}

			# *** Added later ***  The check didn't make sure that the callsign
			# contains a letter. there are letter-only callsigns like RAEM, but not
			# figure-only calls.

			if (preg_match('/^[0-9]+$/', $b)) {            # Callsign only consists of numbers. Bad!
				return null;            # exit, undef
			}

			# Depending on these values we have to determine the prefix.
			# Following cases are possible:
			#
			# 1.    $a and $c undef --> only callsign, subcases
			# 1.1   $b contains a number -> everything from start to number
			# 1.2   $b contains no number -> first two letters plus 0
			# 2.    $a undef, subcases:
			# 2.1   $c is only a number -> $a with changed number
			# 2.2   $c is /P,/M,/MM,/AM -> 1.
			# 2.3   $c is something else and will be interpreted as a Prefix
			# 3.    $a is defined, will be taken as PFX, regardless of $c

			if (($a == null) && ($c == null)) {                     # Case 1
				if (preg_match('/\d/', $b)) {                       # Case 1.1, contains number
					preg_match('/(.+\d)[A-Z]*/', $b, $matches);     # Prefix is all but the last
					$prefix = $matches[1];                          # Letters
				} else {                                            # Case 1.2, no number
					$prefix = substr($b, 0, 2) . "0";               # first two + 0
				}
			} elseif (($a == null) && (isset($c))) {                # Case 2, CALL/X
				if (preg_match('/^(\d)/', $c)) {                    # Case 2.1, number
					preg_match('/(.+\d)[A-Z]*/', $b, $matches);     # regular Prefix in $1
					# Here we need to find out how many digits there are in the
					# prefix, because for example A45XR/0 is A40. If there are 2
					# numbers, the first is not deleted. If course in exotic cases
					# like N66A/7 -> N7 this brings the wrong result of N67, but I
					# think that's rather irrelevant cos such calls rarely appear
					# and if they do, it's very unlikely for them to have a number
					# attached.   You can still edit it by hand anyway..
					if (preg_match('/^([A-Z]\d)\d$/', $matches[1])) {        # e.g. A45   $c = 0
						$prefix = $matches[1] . $c;  # ->   A40
					} else {                         # Otherwise cut all numbers
						preg_match('/(.*[A-Z])\d+/', $matches[1], $match); # Prefix w/o number in $1
						$prefix = $match[1] . $c; # Add attached number
					}
				} elseif (preg_match($csadditions, $c)) {
					preg_match('/(.+\d)[A-Z]*/', $b, $matches);     # Known attachment -> like Case 1.1
					$prefix = $matches[1];
				} elseif (preg_match($noneadditions, $c)) {
					return '';
				} elseif (preg_match('/^\d\d+$/', $c)) {            # more than 2 numbers -> ignore
					preg_match('/(.+\d)[A-Z]* /', $b, $matches);    # see above
					$prefix = $matches[1][0];
				} else {                                            # Must be a Prefix!
					if (preg_match('/\d$/', $c)) {                  # ends in number -> good prefix
						$prefix = $c;
					} else {                                        # Add Zero at the end
						$prefix = $c . "0";
					}
				}
			} elseif (($a) && (preg_match($noneadditions, $c))) {                # Case 2.1, X/CALL/X ie TF/DL2NWK/MM - DXCC none
			return '';
			} elseif ($a) {
				# $a contains the prefix we want
				if (preg_match('/\d$/', $a)) {                      # ends in number -> good prefix
					$prefix = $a;
				} else {                                            # add zero if no number
					$prefix = $a . "0";
				}
			}
			# In very rare cases (right now I can only think of KH5K and KH7K and FRxG/T
			# etc), the prefix is wrong, for example KH5K/DJ1YFK would be KH5K0. In this
			# case, the superfluous part will be cropped. Since this, however, changes the
			# DXCC of the prefix, this will NOT happen when invoked from with an
			# extra parameter $_[1]; this will happen when invoking it from &dxcc.

			if (preg_match('/(\w+\d)[A-Z]+\d/', $prefix, $matches) && $i == null) {
				$prefix = $matches[1][0];
			}
			return $prefix;
		} else {
			return '';
		}
	}

	  /*
    * Read cty.dat from AD1C
    */
    function read_data($date) {
		$CI =& get_instance();
		$dxcc_exceptions = $CI->db->select('`entity`, `adif`, `cqz`, `start`, `end`, `call`, `cont`, `long`, `lat`')
		->where('(start <= ', $date)
		->or_where('start is null)', NULL, false)
		->where('(end >= ', $date)
		->or_where('end is null)', NULL, false)
		->get('dxcc_exceptions');

		if ($dxcc_exceptions->num_rows() > 0){
			foreach ($dxcc_exceptions->result() as $dxcce) {
				$this->dxccexceptions[$dxcce->call]['adif'] = $dxcce->adif;
				$this->dxccexceptions[$dxcce->call]['cont'] = $dxcce->cont;
				$this->dxccexceptions[$dxcce->call]['entity'] = $dxcce->entity;
				$this->dxccexceptions[$dxcce->call]['cqz'] = $dxcce->cqz;
				$this->dxccexceptions[$dxcce->call]['start'] = $dxcce->start;
				$this->dxccexceptions[$dxcce->call]['end'] = $dxcce->end;
				$this->dxccexceptions[$dxcce->call]['long'] = $dxcce->long;
				$this->dxccexceptions[$dxcce->call]['lat'] = $dxcce->lat;
			}
		}

		$dxcc_result = $CI->db->select('*')
		->where('(start <= ', $date)
		->or_where("start is null)", NULL, false)
		->where('(end >= ', $date)
		->or_where("end is null)", NULL, false)
		->get('dxcc_prefixes');

		if ($dxcc_result->num_rows() > 0){
			foreach ($dxcc_result->result() as $dx) {
				$this->dxcc[$dx->call]['adif'] = $dx->adif;
				$this->dxcc[$dx->call]['cont'] = $dx->cont;
				$this->dxcc[$dx->call]['entity'] = $dx->entity;
				$this->dxcc[$dx->call]['cqz'] = $dx->cqz;
				$this->dxcc[$dx->call]['start'] = $dx->start;
				$this->dxcc[$dx->call]['end'] = $dx->end;
				$this->dxcc[$dx->call]['long'] = $dx->long;
				$this->dxcc[$dx->call]['lat'] = $dx->lat;
			}
		}

    }

}
