From f5adc6c0ee7965abcad4cc73d0f36d1ed3cba3cc Mon Sep 17 00:00:00 2001
From: Boris Kolpackov <boris@codesynthesis.com>
Date: Tue, 29 Sep 2015 11:29:50 +0200
Subject: Complete pkg-status, rework object model

---
 bpkg/pkg-status.cxx | 124 ++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 106 insertions(+), 18 deletions(-)

(limited to 'bpkg/pkg-status.cxx')

diff --git a/bpkg/pkg-status.cxx b/bpkg/pkg-status.cxx
index c75019e..dbd2bd0 100644
--- a/bpkg/pkg-status.cxx
+++ b/bpkg/pkg-status.cxx
@@ -4,7 +4,8 @@
 
 #include <bpkg/pkg-status>
 
-#include <iostream> // cout
+#include <iostream>   // cout
+#include <functional> // function
 
 #include <bpkg/types>
 #include <bpkg/package>
@@ -39,39 +40,126 @@ namespace bpkg
 
     database db (open (c, trace));
     transaction t (db.begin ());
+    session s;
 
-    using query = odb::query<package>;
-    query q (query::name == n);
+    level4 ([&]{trace << "package " << n << "; version " << v;});
 
-    if (!v.empty ())
+    // First search in the packages that already exist in this configuration.
+    //
+    shared_ptr<package> p;
     {
-      q = q && (query::version.epoch == v.epoch () &&
-                query::version.revision == v.revision () &&
-                query::version.canonical_upstream == v.canonical_upstream ());
-    }
+      using query = query<package>;
+      query q (query::name == n);
 
-    shared_ptr<package> p (db.query_one<package> (q));
-    t.commit ();
+      if (!v.empty ())
+        q = q && query::version == v;
+
+      p = db.query_one<package> (q);
+    }
 
-    if (p == nullptr)
+    // Now look for available packages. If the user specified the version
+    // explicitly and we found the corresponding existing package, then
+    // no need to look for it in available packages.
+    //
+    vector<shared_ptr<available_package>> aps;
+    if (p == nullptr || v.empty ())
     {
-      // @@ TODO: This is where we search the packages available in
-      // the repositories and if found, print its status as 'available'
-      // plus a list of versions.
+      using query = query<available_package>;
+
+      query q (query::id.name == n);
+
+      // If we found an existing package, then only look for versions
+      // greater than what already exists.
       //
-      cout << "unknown";
+      if (p != nullptr)
+        q = q && query::id.version > p->version;
+      else if (!v.empty ())
+        //
+        // Otherwise, if the user specified the version, then only look for
+        // that specific version.
+        //
+        q = q && query::id.version == v;
+
+      q += order_by_version_desc (query::id.version);
+
+      // Only consider packages that are in repositories that were
+      // explicitly added to the configuration and their complements,
+      // transitively. While we could maybe come up with a (barely
+      // comprehensible) view/query to achieve this, doing it on the
+      // "client side" is definitely more straightforward.
+      //
+      shared_ptr<repository> root (db.load<repository> (""));
+
+      for (shared_ptr<available_package> ap:
+             pointer_result (db.query<available_package> (q)))
+      {
+        function<bool (const shared_ptr<repository>&)> find =
+          [&ap, &find](const shared_ptr<repository>& r) -> bool
+        {
+          const auto& cs (r->complements);
+
+          for (const package_location& pl: ap->locations)
+          {
+            // First check all the complements without loading them.
+            //
+            if (cs.find (pl.repository) != cs.end ())
+              return true;
+
+            // If not found, then load the complements and check them
+            // recursively.
+            //
+            for (lazy_shared_ptr<repository> cr: cs)
+            {
+              if (find (cr.load ()))
+                return true;
+            }
+          }
+
+          return false;
+        };
+
+        level4 ([&]{trace << "available " << ap->version;});
+
+        if (find (root))
+          aps.push_back (ap);
+      }
     }
-    else
+
+    t.commit ();
+
+    bool found (false);
+
+    if (p != nullptr)
     {
       cout << p->state;
 
-      // Also print the version of the package unless the user
-      // specified it.
+      // Also print the version of the package unless the user specified it.
       //
       if (v.empty ())
         cout << " " << p->version;
+
+      found = true;
     }
 
+    if (!aps.empty ())
+    {
+      cout << (found ? "; " : "") << "available";
+
+      // If the user specified the version, then there will be only one
+      // entry.
+      //
+      if (v.empty ())
+      {
+        for (shared_ptr<available_package> ap: aps)
+          cout << ' ' << ap->version;
+      }
+
+      found = true;
+    }
+
+    if (!found)
+      cout << "unknown";
+
     cout << endl;
   }
 }
-- 
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