// Copyright 2014, Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package vtgate

import (
	"io/ioutil"
	"os"
	"time"

	mproto "github.com/youtube/vitess/go/mysql/proto"
	"github.com/youtube/vitess/go/vt/topo"
	"github.com/youtube/vitess/go/vt/vtgate/planbuilder"
	"github.com/youtube/vitess/go/vt/vtgate/proto"
	_ "github.com/youtube/vitess/go/vt/vtgate/vindexes"
	"golang.org/x/net/context"
)

var routerSchema = createTestSchema(`
{
  "Keyspaces": {
    "TestRouter": {
      "Sharded": true,
      "Vindexes": {
        "user_index": {
          "Type": "hash_autoinc",
          "Owner": "user",
          "Params": {
            "Table": "user_idx",
            "Column": "id"
          }
        },
        "music_user_map": {
          "Type": "lookup_hash_unique_autoinc",
          "Owner": "music",
          "Params": {
            "Table": "music_user_map",
            "From": "music_id",
            "To": "user_id"
          }
        },
        "name_user_map": {
          "Type": "lookup_hash",
          "Owner": "user",
          "Params": {
            "Table": "name_user_map",
            "From": "name",
            "To": "user_id"
          }
        },
        "idx1": {
          "Type": "hash_autoinc",
          "Owner": "multi_autoinc_table",
          "Params": {
            "Table": "idx1",
            "Column": "id1"
          }
        },
        "idx2": {
          "Type": "lookup_hash_autoinc",
          "Owner": "multi_autoinc_table",
          "Params": {
            "Table": "idx2",
            "From": "id",
            "To": "val"
          }
        },
        "idx_noauto": {
          "Type": "hash",
          "Owner": "noauto_table"
        },
        "keyspace_id": {
          "Type": "numeric"
        }
      },
      "Classes": {
        "user": {
          "ColVindexes": [
            {
              "Col": "id",
              "Name": "user_index"
            },
            {
              "Col": "name",
              "Name": "name_user_map"
            }
          ]
        },
        "user_extra": {
          "ColVindexes": [
            {
              "Col": "user_id",
              "Name": "user_index"
            }
          ]
        },
        "music": {
          "ColVindexes": [
            {
              "Col": "user_id",
              "Name": "user_index"
            },
            {
              "Col": "id",
              "Name": "music_user_map"
            }
          ]
        },
        "music_extra": {
          "ColVindexes": [
            {
              "Col": "user_id",
              "Name": "user_index"
            },
            {
              "Col": "music_id",
              "Name": "music_user_map"
            }
          ]
        },
        "music_extra_reversed": {
          "ColVindexes": [
            {
              "Col": "music_id",
              "Name": "music_user_map"
            },
            {
              "Col": "user_id",
              "Name": "user_index"
            }
          ]
        },
        "multi_autoinc_table": {
          "ColVindexes": [
            {
              "Col": "id1",
              "Name": "idx1"
            },
            {
              "Col": "id2",
              "Name": "idx2"
            }
          ]
        },
        "noauto_table": {
          "ColVindexes": [
            {
              "Col": "id",
              "Name": "idx_noauto"
            }
          ]
        },
        "ksid_table": {
          "ColVindexes": [
            {
              "Col": "keyspace_id",
              "Name": "keyspace_id"
            }
          ]
        }
      },
      "Tables": {
        "user": "user",
        "user_extra": "user_extra",
        "music": "music",
        "music_extra": "music_extra",
        "music_extra_reversed": "music_extra_reversed",
        "multi_autoinc_table": "multi_autoinc_table",
        "noauto_table": "noauto_table",
        "ksid_table": "ksid_table"
      }
    },
    "TestBadSharding": {
      "Sharded": false,
      "Tables": {
        "sharded_table": ""
      }
    },
    "TestUnsharded": {
      "Sharded": false,
      "Tables": {
        "user_idx": "",
        "music_user_map": "",
        "name_user_map": "",
        "idx1": "",
        "idx2": ""
      }
    }
  }
}
`)

// createTestSchema creates a schema based on the JSON specs.
// It panics on failure.
func createTestSchema(schemaJSON string) *planbuilder.Schema {
	f, err := ioutil.TempFile("", "vtgate_schema")
	if err != nil {
		panic(err)
	}
	fname := f.Name()
	f.Close()
	defer os.Remove(fname)

	err = ioutil.WriteFile(fname, []byte(schemaJSON), 0644)
	if err != nil {
		panic(err)
	}
	schema, err := planbuilder.LoadSchemaJSON(fname)
	if err != nil {
		panic(err)
	}
	return schema
}

func createRouterEnv() (router *Router, sbc1, sbc2, sbclookup *sandboxConn) {
	s := createSandbox("TestRouter")
	sbc1 = &sandboxConn{}
	sbc2 = &sandboxConn{}
	s.MapTestConn("-20", sbc1)
	s.MapTestConn("40-60", sbc2)

	l := createSandbox(TEST_UNSHARDED)
	sbclookup = &sandboxConn{}
	l.MapTestConn("0", sbclookup)

	createSandbox("TestBadSharding")

	serv := new(sandboxTopo)
	scatterConn := NewScatterConn(serv, "", "aa", 1*time.Second, 10, 1*time.Millisecond)
	router = NewRouter(serv, "aa", routerSchema, "", scatterConn)
	return router, sbc1, sbc2, sbclookup
}

func routerExec(router *Router, sql string, bv map[string]interface{}) (*mproto.QueryResult, error) {
	return router.Execute(context.Background(), &proto.Query{
		Sql:           sql,
		BindVariables: bv,
		TabletType:    topo.TYPE_MASTER,
	})
}

func routerStream(router *Router, q *proto.Query) (qr *mproto.QueryResult, err error) {
	results := make(chan *mproto.QueryResult, 10)
	err = router.StreamExecute(context.Background(), q, func(qr *mproto.QueryResult) error {
		results <- qr
		return nil
	})
	close(results)
	if err != nil {
		return nil, err
	}
	first := true
	for r := range results {
		if first {
			qr = &mproto.QueryResult{Fields: r.Fields}
			first = false
		}
		qr.Rows = append(qr.Rows, r.Rows...)
		qr.RowsAffected += r.RowsAffected
	}
	return qr, nil
}