/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF 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 commands

import (
	"errors"
	"fmt"

	"github.com/apache/incubator-openwhisk-cli/wski18n"
	"github.com/apache/incubator-openwhisk-client-go/whisk"

	"github.com/fatih/color"
	"github.com/spf13/cobra"
)

// ruleCmd represents the rule command
var ruleCmd = &cobra.Command{
	Use:   "rule",
	Short: wski18n.T("work with rules"),
}

var ruleEnableCmd = &cobra.Command{
	Use:           "enable RULE_NAME",
	Short:         wski18n.T("enable rule"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 1, 1, "Rule enable", wski18n.T("A rule name is required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()

		_, _, err = Client.Rules.SetState(ruleName, "active")
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.SetState(%s, active) failed: %s\n", ruleName, err)
			errStr := wski18n.T("Unable to enable rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} enabled rule {{.name}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
		return nil
	},
}

var ruleDisableCmd = &cobra.Command{
	Use:           "disable RULE_NAME",
	Short:         wski18n.T("disable rule"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 1, 1, "Rule disable", wski18n.T("A rule name is required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()

		_, _, err = Client.Rules.SetState(ruleName, "inactive")
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.SetState(%s, inactive) failed: %s\n", ruleName, err)
			errStr := wski18n.T("Unable to disable rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} disabled rule {{.name}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
		return nil
	},
}

var ruleStatusCmd = &cobra.Command{
	Use:           "status RULE_NAME",
	Short:         wski18n.T("get rule status"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 1, 1, "Rule status", wski18n.T("A rule name is required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()

		rule, _, err := Client.Rules.Get(ruleName)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.Get(%s) failed: %s\n", ruleName, err)
			errStr := wski18n.T("Unable to get status of rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.DISPLAY_USAGE)
			return werr
		}

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} rule {{.name}} is {{.status}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName), "status": boldString(rule.Status)}))
		return nil
	},
}

var ruleCreateCmd = &cobra.Command{
	Use:           "create RULE_NAME TRIGGER_NAME ACTION_NAME",
	Short:         wski18n.T("create new rule"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 3, 3, "Rule create",
			wski18n.T("A rule, trigger and action name are required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()
		triggerName := getQualifiedName(args[1], Properties.Namespace)
		actionName := getQualifiedName(args[2], Properties.Namespace)

		rule := &whisk.Rule{
			Name:    ruleName,
			Trigger: triggerName,
			Action:  actionName,
		}

		whisk.Debug(whisk.DbgInfo, "Inserting rule:\n%+v\n", rule)
		var retRule *whisk.Rule
		retRule, _, err = Client.Rules.Insert(rule, false)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.Insert(%#v) failed: %s\n", rule, err)
			errStr := wski18n.T("Unable to create rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}
		whisk.Debug(whisk.DbgInfo, "Inserted rule:\n%+v\n", retRule)

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} created rule {{.name}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
		return nil
	},
}

var ruleUpdateCmd = &cobra.Command{
	Use:           "update RULE_NAME TRIGGER_NAME ACTION_NAME",
	Short:         wski18n.T("update an existing rule, or create a rule if it does not exist"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 3, 3, "Rule update",
			wski18n.T("A rule, trigger and action name are required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()
		triggerName := getQualifiedName(args[1], Properties.Namespace)
		actionName := getQualifiedName(args[2], Properties.Namespace)

		rule := &whisk.Rule{
			Name:    ruleName,
			Trigger: triggerName,
			Action:  actionName,
		}

		_, _, err = Client.Rules.Insert(rule, true)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.Insert(%#v) failed: %s\n", rule, err)
			errStr := wski18n.T("Unable to update rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": rule.Name, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} updated rule {{.name}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
		return nil
	},
}

var ruleGetCmd = &cobra.Command{
	Use:           "get RULE_NAME",
	Short:         wski18n.T("get rule"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var field string
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 1, 2, "Rule get", wski18n.T("A rule name is required.")); whiskErr != nil {
			return whiskErr
		}

		if len(args) > 1 {
			field = args[1]

			if !fieldExists(&whisk.Rule{}, field) {
				errMsg := wski18n.T("Invalid field filter '{{.arg}}'.", map[string]interface{}{"arg": field})
				whiskErr := whisk.MakeWskError(errors.New(errMsg), whisk.EXIT_CODE_ERR_GENERAL,
					whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
				return whiskErr
			}
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()

		rule, _, err := Client.Rules.Get(ruleName)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.Get(%s) failed: %s\n", ruleName, err)
			errStr := wski18n.T("Unable to get rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.DISPLAY_USAGE)
			return werr
		}

		if Flags.rule.summary {
			printRuleSummary(rule)
		} else {
			if len(field) > 0 {
				fmt.Fprintf(color.Output, wski18n.T("{{.ok}} got rule {{.name}}, displaying field {{.field}}\n",
					map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName),
						"field": field}))
				printField(rule, field)
			} else {
				fmt.Fprintf(color.Output, wski18n.T("{{.ok}} got rule {{.name}}\n",
					map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
				printJSON(rule)
			}
		}

		return nil
	},
}

var ruleDeleteCmd = &cobra.Command{
	Use:           "delete RULE_NAME",
	Short:         wski18n.T("delete rule"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 1, 1, "Rule delete", wski18n.T("A rule name is required.")); whiskErr != nil {
			return whiskErr
		}

		if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
			return NewQualifiedNameError(args[0], err)
		}

		Client.Namespace = qualifiedName.GetNamespace()
		ruleName := qualifiedName.GetEntityName()

		if Flags.rule.disable {
			_, _, err := Client.Rules.SetState(ruleName, "inactive")
			if err != nil {
				whisk.Debug(whisk.DbgError, "Client.Rules.SetState(%s, inactive) failed: %s\n", ruleName, err)
				errStr := wski18n.T("Unable to disable rule '{{.name}}': {{.err}}",
					map[string]interface{}{"name": ruleName, "err": err})
				werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
				return werr
			}
		}

		_, err = Client.Rules.Delete(ruleName)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.Delete(%s) error: %s\n", ruleName, err)
			errStr := wski18n.T("Unable to delete rule '{{.name}}': {{.err}}",
				map[string]interface{}{"name": ruleName, "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		}

		fmt.Fprintf(color.Output,
			wski18n.T("{{.ok}} deleted rule {{.name}}\n",
				map[string]interface{}{"ok": color.GreenString("ok:"), "name": boldString(ruleName)}))
		return nil
	},
}

var ruleListCmd = &cobra.Command{
	Use:           "list [NAMESPACE]",
	Short:         wski18n.T("list all rules"),
	SilenceUsage:  true,
	SilenceErrors: true,
	PreRunE:       SetupClientConfig,
	RunE: func(cmd *cobra.Command, args []string) error {
		var err error
		var qualifiedName = new(QualifiedName)

		if whiskErr := CheckArgs(args, 0, 1, "Rule list",
			wski18n.T("An optional namespace is the only valid argument.")); whiskErr != nil {
			return whiskErr
		}

		if len(args) == 1 {
			if qualifiedName, err = NewQualifiedName(args[0]); err != nil {
				return NewQualifiedNameError(args[0], err)
			}

			if len(qualifiedName.GetEntityName()) > 0 {
				return entityNameError(qualifiedName.GetEntityName())
			}

			Client.Namespace = qualifiedName.GetNamespace()
		}

		ruleListOptions := &whisk.RuleListOptions{
			Skip:  Flags.common.skip,
			Limit: Flags.common.limit,
		}

		rules, _, err := Client.Rules.List(ruleListOptions)
		if err != nil {
			whisk.Debug(whisk.DbgError, "Client.Rules.List(%#v) error: %s\n", ruleListOptions, err)
			errStr := wski18n.T("Unable to obtain the list of rules for namespace '{{.name}}': {{.err}}",
				map[string]interface{}{"name": getClientNamespace(), "err": err})
			werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
			return werr
		} else {
			//No errors, lets attempt to retrieve the status of each rule #312
			for index, rule := range rules {
				ruleStatus, _, err := Client.Rules.Get(rule.Name)
				if err != nil {
					errStr := wski18n.T("Unable to get status of rule '{{.name}}': {{.err}}",
						map[string]interface{}{"name": rule.Name, "err": err})
					fmt.Println(errStr)
					werr := whisk.MakeWskErrorFromWskError(errors.New(errStr), err, whisk.EXIT_CODE_ERR_GENERAL, whisk.DISPLAY_MSG, whisk.NO_DISPLAY_USAGE)
					return werr
				}
				rules[index].Status = ruleStatus.Status
			}
		}

		sortByName := Flags.common.nameSort
		printList(rules, sortByName)
		return nil
	},
}

func init() {
	ruleDeleteCmd.Flags().BoolVar(&Flags.rule.disable, "disable", false, wski18n.T("automatically disable rule before deleting it"))

	ruleGetCmd.Flags().BoolVarP(&Flags.rule.summary, "summary", "s", false, wski18n.T("summarize rule details"))

	ruleListCmd.Flags().IntVarP(&Flags.common.skip, "skip", "s", 0, wski18n.T("exclude the first `SKIP` number of rules from the result"))
	ruleListCmd.Flags().IntVarP(&Flags.common.limit, "limit", "l", 30, wski18n.T("only return `LIMIT` number of rules from the collection"))
	ruleListCmd.Flags().BoolVarP(&Flags.common.nameSort, "name-sort", "n", false, wski18n.T("sorts a list alphabetically by entity name; only applicable within the limit/skip returned entity block"))

	ruleCmd.AddCommand(
		ruleCreateCmd,
		ruleEnableCmd,
		ruleDisableCmd,
		ruleStatusCmd,
		ruleUpdateCmd,
		ruleGetCmd,
		ruleDeleteCmd,
		ruleListCmd,
	)

}