/*
   Copyright 2024 Docker Compose CLI authors

   Licensed 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 compose

import (
	"bytes"
	"strings"
	"testing"

	"github.com/docker/compose/v2/pkg/api"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

var topTestCases = []struct {
	name   string
	titles []string
	procs  [][]string

	header  topHeader
	entries []topEntries
	output  string
}{
	{
		name:    "noprocs",
		titles:  []string{"UID", "PID", "PPID", "C", "STIME", "TTY", "TIME", "CMD"},
		procs:   [][]string{},
		header:  topHeader{"SERVICE": 0},
		entries: []topEntries{},
		output:  "",
	},
	{
		name:   "simple",
		titles: []string{"UID", "PID", "PPID", "C", "STIME", "TTY", "TIME", "CMD"},
		procs:  [][]string{{"root", "1", "1", "0", "12:00", "?", "00:00:01", "/entrypoint"}},
		header: topHeader{
			"SERVICE": 0,
			"UID":     1,
			"PID":     2,
			"PPID":    3,
			"C":       4,
			"STIME":   5,
			"TTY":     6,
			"TIME":    7,
			"CMD":     8,
		},
		entries: []topEntries{
			{
				"SERVICE": "simple",
				"UID":     "root",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:01",
				"CMD":     "/entrypoint",
			},
		},
		output: trim(`
			SERVICE   UID    PID   PPID   C    STIME   TTY   TIME       CMD
			simple    root   1     1      0    12:00   ?     00:00:01   /entrypoint
		`),
	},
	{
		name:   "noppid",
		titles: []string{"UID", "PID", "C", "STIME", "TTY", "TIME", "CMD"},
		procs:  [][]string{{"root", "1", "0", "12:00", "?", "00:00:02", "/entrypoint"}},
		header: topHeader{
			"SERVICE": 0,
			"UID":     1,
			"PID":     2,
			"C":       3,
			"STIME":   4,
			"TTY":     5,
			"TIME":    6,
			"CMD":     7,
		},
		entries: []topEntries{
			{
				"SERVICE": "noppid",
				"UID":     "root",
				"PID":     "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:02",
				"CMD":     "/entrypoint",
			},
		},
		output: trim(`
			SERVICE   UID    PID   C    STIME   TTY   TIME       CMD
			noppid    root   1     0    12:00   ?     00:00:02   /entrypoint
		`),
	},
	{
		name:   "extra-hdr",
		titles: []string{"UID", "GID", "PID", "PPID", "C", "STIME", "TTY", "TIME", "CMD"},
		procs:  [][]string{{"root", "1", "1", "1", "0", "12:00", "?", "00:00:03", "/entrypoint"}},
		header: topHeader{
			"SERVICE": 0,
			"UID":     1,
			"GID":     2,
			"PID":     3,
			"PPID":    4,
			"C":       5,
			"STIME":   6,
			"TTY":     7,
			"TIME":    8,
			"CMD":     9,
		},
		entries: []topEntries{
			{
				"SERVICE": "extra-hdr",
				"UID":     "root",
				"GID":     "1",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:03",
				"CMD":     "/entrypoint",
			},
		},
		output: trim(`
			SERVICE     UID    GID   PID   PPID   C    STIME   TTY   TIME       CMD
			extra-hdr   root   1     1     1      0    12:00   ?     00:00:03   /entrypoint
		`),
	},
	{
		name:   "multiple",
		titles: []string{"UID", "PID", "PPID", "C", "STIME", "TTY", "TIME", "CMD"},
		procs: [][]string{
			{"root", "1", "1", "0", "12:00", "?", "00:00:04", "/entrypoint"},
			{"root", "123", "1", "0", "12:00", "?", "00:00:42", "sleep infinity"},
		},
		header: topHeader{
			"SERVICE": 0,
			"UID":     1,
			"PID":     2,
			"PPID":    3,
			"C":       4,
			"STIME":   5,
			"TTY":     6,
			"TIME":    7,
			"CMD":     8,
		},
		entries: []topEntries{
			{
				"SERVICE": "multiple",
				"UID":     "root",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:04",
				"CMD":     "/entrypoint",
			},
			{
				"SERVICE": "multiple",
				"UID":     "root",
				"PID":     "123",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:42",
				"CMD":     "sleep infinity",
			},
		},
		output: trim(`
			SERVICE    UID    PID   PPID   C    STIME   TTY   TIME       CMD
			multiple   root   1     1      0    12:00   ?     00:00:04   /entrypoint
			multiple   root   123   1      0    12:00   ?     00:00:42   sleep infinity
		`),
	},
}

// TestRunTopCore only tests the core functionality of runTop: formatting
// and printing of the output of (api.Service).Top().
func TestRunTopCore(t *testing.T) {
	t.Parallel()

	all := []api.ContainerProcSummary{}

	for _, tc := range topTestCases {
		summary := api.ContainerProcSummary{
			Name:      tc.name,
			Titles:    tc.titles,
			Processes: tc.procs,
		}
		all = append(all, summary)

		t.Run(tc.name, func(t *testing.T) {
			header, entries := collectTop([]api.ContainerProcSummary{summary})
			assert.EqualValues(t, tc.header, header)
			assert.EqualValues(t, tc.entries, entries)

			var buf bytes.Buffer
			err := topPrint(&buf, header, entries)

			require.NoError(t, err)
			assert.Equal(t, tc.output, buf.String())
		})
	}

	t.Run("all", func(t *testing.T) {
		header, entries := collectTop(all)
		assert.EqualValues(t, topHeader{
			"SERVICE": 0,
			"UID":     1,
			"PID":     2,
			"PPID":    3,
			"C":       4,
			"STIME":   5,
			"TTY":     6,
			"TIME":    7,
			"CMD":     8,
			"GID":     9,
		}, header)
		assert.EqualValues(t, []topEntries{
			{
				"SERVICE": "simple",
				"UID":     "root",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:01",
				"CMD":     "/entrypoint",
			}, {
				"SERVICE": "noppid",
				"UID":     "root",
				"PID":     "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:02",
				"CMD":     "/entrypoint",
			}, {
				"SERVICE": "extra-hdr",
				"UID":     "root",
				"GID":     "1",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:03",
				"CMD":     "/entrypoint",
			}, {
				"SERVICE": "multiple",
				"UID":     "root",
				"PID":     "1",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:04",
				"CMD":     "/entrypoint",
			}, {
				"SERVICE": "multiple",
				"UID":     "root",
				"PID":     "123",
				"PPID":    "1",
				"C":       "0",
				"STIME":   "12:00",
				"TTY":     "?",
				"TIME":    "00:00:42",
				"CMD":     "sleep infinity",
			},
		}, entries)

		var buf bytes.Buffer
		err := topPrint(&buf, header, entries)
		require.NoError(t, err)
		assert.Equal(t, trim(`
			SERVICE     UID    PID   PPID   C    STIME   TTY   TIME       CMD              GID
			simple      root   1     1      0    12:00   ?     00:00:01   /entrypoint      -
			noppid      root   1     -      0    12:00   ?     00:00:02   /entrypoint      -
			extra-hdr   root   1     1      0    12:00   ?     00:00:03   /entrypoint      1
			multiple    root   1     1      0    12:00   ?     00:00:04   /entrypoint      -
			multiple    root   123   1      0    12:00   ?     00:00:42   sleep infinity   -
		`), buf.String())

	})
}

func trim(s string) string {
	var out bytes.Buffer
	for _, line := range strings.Split(strings.TrimSpace(s), "\n") {
		out.WriteString(strings.TrimSpace(line))
		out.WriteRune('\n')
	}
	return out.String()
}