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// license agreements. See the NOTICE file distributed with
// this work for additional information regarding copyright
// ownership. Elasticsearch B.V. licenses this file to you under
// the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing,
// software distributed under the License is distributed on an
// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
// KIND, either express or implied.  See the License for the
// specific language governing permissions and limitations
// under the License.

package kafka

import (
	"fmt"

	"github.com/Shopify/sarama"
)

// Version is a kafka version
type Version string

// TODO: remove me.
// Compat version overwrite for missing versions in sarama
// Public API is compatible between these versions.
var (
	v0_10_2_1 = parseKafkaVersion("0.10.2.1")
	v0_11_0_1 = parseKafkaVersion("0.11.0.1")
	v0_11_0_2 = parseKafkaVersion("0.11.0.2")
	v1_0_1    = parseKafkaVersion("1.0.1")
	v1_0_2    = parseKafkaVersion("1.0.2")
	v1_1_1    = parseKafkaVersion("1.1.1")

	kafkaVersions = map[string]sarama.KafkaVersion{
		"0.8.2.0": sarama.V0_8_2_0,
		"0.8.2.1": sarama.V0_8_2_1,
		"0.8.2.2": sarama.V0_8_2_2,
		"0.8.2":   sarama.V0_8_2_2,
		"0.8":     sarama.V0_8_2_2,

		"0.9.0.0": sarama.V0_9_0_0,
		"0.9.0.1": sarama.V0_9_0_1,
		"0.9.0":   sarama.V0_9_0_1,
		"0.9":     sarama.V0_9_0_1,

		"0.10.0.0": sarama.V0_10_0_0,
		"0.10.0.1": sarama.V0_10_0_1,
		"0.10.0":   sarama.V0_10_0_1,
		"0.10.1.0": sarama.V0_10_1_0,
		"0.10.1":   sarama.V0_10_1_0,
		"0.10.2.0": sarama.V0_10_2_0,
		"0.10.2.1": v0_10_2_1,
		"0.10.2":   v0_10_2_1,
		"0.10":     v0_10_2_1,

		"0.11.0.0": sarama.V0_11_0_0,
		"0.11.0.1": v0_11_0_1,
		"0.11.0.2": v0_11_0_2,
		"0.11.0":   v0_11_0_2,
		"0.11":     v0_11_0_2,

		"1.0.0": sarama.V1_0_0_0,
		"1.0.1": v1_0_1,
		"1.0.2": v1_0_2,
		"1.0":   v1_0_2,
		"1.1.0": sarama.V1_1_0_0,
		"1.1.1": v1_1_1,
		"1.1":   v1_1_1,
		"1":     v1_1_1,

		"2.0.0": sarama.V2_0_0_0,
		"2.0":   sarama.V2_0_0_0,
		"2":     sarama.V2_0_0_0,
	}
)

func parseKafkaVersion(s string) sarama.KafkaVersion {
	v, err := sarama.ParseKafkaVersion(s)
	if err != nil {
		panic(err)
	}
	return v
}

// Validate that a kafka version is among the possible options
func (v *Version) Validate() error {
	if _, ok := kafkaVersions[string(*v)]; !ok {
		return fmt.Errorf("unknown/unsupported kafka vesion '%v'", *v)
	}

	return nil
}

// Unpack a kafka version
func (v *Version) Unpack(s string) error {
	tmp := Version(s)
	if err := tmp.Validate(); err != nil {
		return err
	}

	*v = tmp
	return nil
}

// Get a sarama kafka version
func (v Version) Get() (sarama.KafkaVersion, bool) {
	kv, ok := kafkaVersions[string(v)]
	return kv, ok
}