/*
Package cmd defines user commands accessible from the cli tool.

Copyright © 2022 Joel D. Elkins <joel@elkins.co>

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/
package cmd

import (
	"encoding/json"
	"fmt"
	"slices"

	"gitea.elkins.co/Networking/ccl/internal/pkg/config"
	"gitea.elkins.co/Networking/ccl/internal/pkg/container"
	"github.com/juju/ansiterm"
	"github.com/spf13/cobra"
)

var (
	lsCountAll        bool
	lsCountRunning    bool
	lsCountNotRunning bool
	lsJsonFormat      bool
	lsSortRuntime     bool
	lsNoColor         bool
)

type lsContainerObj struct {
	Category   string `json:"category"`
	StartGroup int    `json:"group"`
	Name       string `json:"name"`
	Image      string `json:"image"`
	Created    bool   `json:"created"`
	Running    bool   `json:"running"`
}

type lsContainerStatsObj struct {
	CPU         float64 `json:"cpu_usage_pct"`
	CPUNano     uint64  `json:"cpu_nano"`
	MemUsage    uint64  `json:"mem_usage_bytes"`
	MemLimit    uint64  `json:"mem_limit_bytes"`
	MemPerc     float64 `json:"mem_usage_pct"`
	NetInput    uint64  `json:"net_input_bytes"`
	NetOutput   uint64  `json:"net_output_bytes"`
	BlockInput  uint64  `json:"block_input_bytes"`
	BlockOutput uint64  `json:"block_output_bytes"`
	UpTime      uint64  `json:"uptime_sec"`
	lsContainerObj
}

// lsCmd represents the ls command
var lsCmd = &cobra.Command{
	Use:               "ls",
	Aliases:           []string{"list"},
	Short:             "List configured containers",
	Args:              cobra.OnlyValidArgs,
	ValidArgsFunction: validNouns,
	Long: `List configured containers. You can provide one or more names
or categories to limit the list.`,
	Example: `ccl ls               # same as below
ccl ls all           # same as above
ccl ls default sub   # multiple ok
ccl ls squid`,
	Run: func(cmd *cobra.Command, args []string) {
		conts := config.Union(args, contMask)
		w := cmd.OutOrStdout()

		if lsCountAll {
			fmt.Fprintf(w, "%d\n", len(conts))
			return
		}

		if lsCountRunning || lsCountNotRunning {
			if conn != nil {
				r := 0
				for _, c := range conts {
					if c.IsRunning() {
						r += 1
					}
				}
				if lsCountRunning {
					fmt.Fprintf(w, "%d\n", r)
				} else {
					fmt.Fprintf(w, "%d\n", len(conts)-r)
				}
				return
			} else {
				fmt.Fprint(w, "Error\n")
				return
			}
		}

		if lsSortRuntime {
			slices.SortFunc(conts, func(a, b *container.Container) int {
				if a.RunningTime().Seconds() > b.RunningTime().Seconds() {
					return -1
				}
				if a.RunningTime().Seconds() < b.RunningTime().Seconds() {
					return 1
				}
				return 0
			})
		}

		if lsJsonFormat {
			out := make([]interface{}, 0)
			for _, c := range conts {
				run, cre := false, false
				if conn != nil {
					run, cre = c.IsRunning(), c.IsCreated()
				}
				baseObj := lsContainerObj{
					Category:   c.Category,
					StartGroup: c.StartGroup,
					Name:       c.Name,
					Image:      c.Image,
					Running:    run,
					Created:    cre,
				}
				if run {
					if stats := c.GetStats(); stats != nil {
						out = append(out, lsContainerStatsObj{
							CPUNano:        stats.CPUNano,
							CPU:            stats.CPU,
							MemUsage:       stats.MemUsage,
							MemLimit:       stats.MemLimit,
							MemPerc:        stats.MemPerc,
							NetInput:       stats.NetInput,
							NetOutput:      stats.NetOutput,
							BlockInput:     stats.BlockInput,
							BlockOutput:    stats.BlockOutput,
							UpTime:         uint64(c.RunningTime().Seconds()),
							lsContainerObj: baseObj,
						})
					} else {
						out = append(out, baseObj)
					}
				} else {
					out = append(out, baseObj)
				}
			}
			val, err := json.Marshal(out)
			if err != nil {
				fmt.Fprintf(cmd.OutOrStderr(), "Error marshalling results: %s", err)
			}
			fmt.Fprint(w, string(val))
			return
		}

		// By default, we are outputing to a terminal or pipe. Other cases
		// should have been handled above and returned.
		tw := ansiterm.NewTabWriter(w, 0, 0, 2, ' ', 0)
		defer tw.Flush()

		defcolor := ansiterm.Foreground(ansiterm.Default)
		red := ansiterm.Foreground(ansiterm.Red)
		yellow := ansiterm.Foreground(ansiterm.Yellow)
		title := ansiterm.Styles(ansiterm.Bold, ansiterm.Underline)
		name := ansiterm.Styles(ansiterm.Italic)
		const IMGLEN int = 20

		if conn != nil {
			title.Fprint(tw, "CATEGORY\tGROUP\tNAME\tIMAGE\tCREATED\t RUNNING\t CPU%\t MEM%\t\n")
			for _, c := range conts {
				defcolor.Fprintf(tw, "%s\t%5d\t", c.Category, c.StartGroup)
				name.Fprintf(tw, "%s\t", c.Name)

				dispimg := c.Image
				if len(dispimg) > IMGLEN {
					dispimg = dispimg[:IMGLEN] + "…"
				}
				defcolor.Fprintf(tw, "%s\t", dispimg)

				if c.IsCreated() {
					defcolor.Fprint(tw, "   ✓\t")
				} else {
					red.Fprint(tw, "   ✗\t")
				}

				if c.IsRunning() {
					raw := int64(c.RunningTime().Seconds())
					seconds := raw % 60
					minutes := (raw / 60) % 60
					hours := (raw / 60) / 60
					defcolor.Fprintf(tw, "%3d:%02d:%02d\t", hours, minutes, seconds)
				} else {
					red.Fprint(tw, "    ✗\t")
				}

				if stats := c.GetStats(); c.IsRunning() && stats != nil {
					for _, st := range []float64{stats.CPU, stats.MemPerc} {
						hi := defcolor
						if st > 5.0 {
							hi = yellow
						}
						if st > 20.0 {
							hi = red
						}
						hi.Fprintf(tw, "%5.1f\t", st)
					}
				} else {
					red.Fprint(tw, "   -\t   -\t")
				}
				fmt.Fprint(tw, "\n")
			}
		} else {
			titlemsg := "CATEGORY\tGROUP\tNAME\tIMAGE\n"
			title.Fprint(tw, titlemsg)

			for _, c := range conts {
				data := []interface{}{c.Category, c.StartGroup, c.Name, c.Image}
				defcolor.Fprintf(tw, "%s\t%5d\t%s\t%s\n", data...)
			}
		}
	},
}

func init() {
	lsCmd.Flags().BoolVarP(&lsCountAll, "count", "C", false, "Return only the count of configured items")
	lsCmd.Flags().BoolVarP(&lsCountRunning, "running", "R", false, "Return only the count of running items")
	lsCmd.Flags().BoolVarP(&lsCountNotRunning, "not-running", "N", false, "Return only the count of stopped/failed items")
	lsCmd.Flags().BoolVarP(&lsJsonFormat, "json", "J", false, "Output results as a json array")
	lsCmd.Flags().BoolVarP(&lsSortRuntime, "sort-runtime", "T", false, "Sort by running time (descending)")
	lsCmd.Flags().BoolVarP(&lsNoColor, "no-color", "K", false, "Suppress ansi color sequences in output")
	lsCmd.MarkFlagsMutuallyExclusive("count", "running", "not-running")
	lsCmd.MarkFlagsMutuallyExclusive("sort-runtime", "json")
	lsCmd.MarkFlagsMutuallyExclusive("sort-runtime", "running")
	lsCmd.MarkFlagsMutuallyExclusive("sort-runtime", "not-running")
	rootCmd.AddCommand(lsCmd)
}