/*
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 cmd

import (
	"bufio"
	"context"
	"fmt"
	"io"
	"os"
	"time"

	"github.com/apache/camel-k/v2/pkg/util"

	"github.com/spf13/cobra"
	v1 "k8s.io/api/core/v1"
	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"

	"github.com/apache/camel-k/v2/pkg/client"
	"github.com/apache/camel-k/v2/pkg/client/camel/clientset/versioned"
	"github.com/apache/camel-k/v2/pkg/util/kubernetes"
	"github.com/apache/camel-k/v2/pkg/util/tar"
)

func newCmdDump(rootCmdOptions *RootCmdOptions) (*cobra.Command, *dumpCmdOptions) {
	options := dumpCmdOptions{
		RootCmdOptions: rootCmdOptions,
	}
	cmd := cobra.Command{
		Use:     "dump [filename]",
		Short:   "Dump the state of namespace",
		Long:    `Dump the state of currently used namespace. If no filename will be specified, the output will be on stdout`,
		PreRunE: decode(&options, options.Flags),
		RunE:    options.dump,
		// Once we moved from the deprecation this should be hidden and only used internally for E2E test execution.
		Deprecated: "no longer supported.",
		// Hidden: true,
	}

	cmd.Flags().Int("logLines", 100, "Number of log lines to dump")
	cmd.Flags().Bool("compressed", false, "If the log file must be compressed in a tar.")

	return &cmd, &options
}

type dumpCmdOptions struct {
	*RootCmdOptions

	LogLines   int  `mapstructure:"logLines"`
	Compressed bool `mapstructure:"compressed" yaml:",omitempty"`
}

func (o *dumpCmdOptions) dump(cmd *cobra.Command, args []string) error {
	c, err := o.GetCmdClient()
	if err != nil {
		return err
	}

	if len(args) == 1 {
		err = util.WithFile(args[0], os.O_RDWR|os.O_CREATE, 0o644, func(file *os.File) error {
			if !o.Compressed {
				return dumpNamespace(o.Context, c, o.Namespace, file, o.LogLines)
			}
			err = dumpNamespace(o.Context, c, o.Namespace, file, o.LogLines)
			if err != nil {
				return err
			}
			tar.CreateTarFile([]string{file.Name()}, "dump."+file.Name()+"."+time.Now().Format(time.RFC3339)+".tar.gz", cmd.OutOrStdout())

			return nil
		})
	} else {
		return dumpNamespace(o.Context, c, o.Namespace, cmd.OutOrStdout(), o.LogLines)
	}

	return nil
}

func dumpNamespace(ctx context.Context, c client.Client, ns string, out io.Writer, logLines int) error {
	camelClient, err := versioned.NewForConfig(c.GetConfig())
	if err != nil {
		return err
	}

	// Integrations
	its, err := camelClient.CamelV1().Integrations(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d integrations:\n", len(its.Items))
	for _, integration := range its.Items {
		ref := integration
		pdata, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(pdata))
	}

	// IntegrationKits
	iks, err := camelClient.CamelV1().IntegrationKits(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d integration kits:\n", len(iks.Items))
	for _, ik := range iks.Items {
		ref := ik
		pdata, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(pdata))
	}

	// ConfigMaps
	cms, err := c.CoreV1().ConfigMaps(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d ConfigMaps:\n", len(cms.Items))
	for _, cm := range cms.Items {
		ref := cm
		pdata, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(pdata))
	}

	// Deployments
	deployments, err := c.AppsV1().Deployments(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d deployments:\n", len(deployments.Items))
	for _, deployment := range deployments.Items {
		ref := deployment
		data, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(data))
	}

	// IntegrationPlatforms
	pls, err := camelClient.CamelV1().IntegrationPlatforms(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d platforms:\n", len(pls.Items))
	for _, p := range pls.Items {
		ref := p
		pdata, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(pdata))
	}

	// CamelCatalogs
	cat, err := camelClient.CamelV1().CamelCatalogs(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}
	fmt.Fprintf(out, "Found %d catalogs:\n", len(pls.Items))
	for _, c := range cat.Items {
		ref := c
		cdata, err := kubernetes.ToYAML(&ref)
		if err != nil {
			return err
		}
		fmt.Fprintf(out, "---\n%s\n---\n", string(cdata))
	}

	// Pods and Logs
	lst, err := c.CoreV1().Pods(ns).List(ctx, metav1.ListOptions{})
	if err != nil {
		return err
	}

	fmt.Fprintf(out, "\nFound %d pods:\n", len(lst.Items))
	for _, pod := range lst.Items {
		fmt.Fprintf(out, "name=%s\n", pod.Name)
		dumpConditions("  ", pod.Status.Conditions, out)
		fmt.Fprintf(out, "  logs:\n")
		allContainers := make([]v1.Container, 0, len(pod.Spec.InitContainers)+len(pod.Spec.Containers))
		allContainers = append(allContainers, pod.Spec.InitContainers...)
		allContainers = append(allContainers, pod.Spec.Containers...)
		for _, container := range allContainers {
			pad := "    "
			fmt.Fprintf(out, "%s%s\n", pad, container.Name)
			err := dumpLogs(ctx, c, pad+"> ", ns, pod.Name, container.Name, out, logLines)
			if err != nil {
				fmt.Fprintf(out, "%sERROR while reading the logs: %v\n", pad, err)
			}
		}
	}

	return nil
}

func dumpConditions(prefix string, conditions []v1.PodCondition, out io.Writer) {
	for _, cond := range conditions {
		fmt.Fprintf(out, "%scondition type=%s, status=%s, reason=%s, message=%q\n", prefix, cond.Type, cond.Status, cond.Reason, cond.Message)
	}
}

func dumpLogs(ctx context.Context, c client.Client, prefix string, ns string, name string, container string, out io.Writer, logLines int) error {
	lines := int64(logLines)
	stream, err := c.CoreV1().Pods(ns).GetLogs(name, &v1.PodLogOptions{
		Container: container,
		TailLines: &lines,
	}).Stream(ctx)
	if err != nil {
		return err
	}

	scanner := bufio.NewScanner(stream)
	printed := false
	for scanner.Scan() {
		printed = true
		fmt.Fprintf(out, "%s%s\n", prefix, scanner.Text())
	}
	if !printed {
		fmt.Fprintf(out, "%s[no logs available]\n", prefix)
	}

	return stream.Close()
}
