package formatter

import (
	"bytes"
	"testing"

	"github.com/docker/docker/pkg/stringid"
	"github.com/docker/docker/pkg/testutil/assert"
)

func TestContainerStatsContext(t *testing.T) {
	containerID := stringid.GenerateRandomID()

	var ctx containerStatsContext
	tt := []struct {
		stats     StatsEntry
		expValue  string
		expHeader string
		call      func() string
	}{
		{StatsEntry{Name: containerID}, containerID, containerHeader, ctx.Container},
		{StatsEntry{CPUPercentage: 5.5}, "5.50%", cpuPercHeader, ctx.CPUPerc},
		{StatsEntry{CPUPercentage: 5.5, IsInvalid: true}, "--", cpuPercHeader, ctx.CPUPerc},
		{StatsEntry{NetworkRx: 0.31, NetworkTx: 12.3}, "0.31 B / 12.3 B", netIOHeader, ctx.NetIO},
		{StatsEntry{NetworkRx: 0.31, NetworkTx: 12.3, IsInvalid: true}, "--", netIOHeader, ctx.NetIO},
		{StatsEntry{BlockRead: 0.1, BlockWrite: 2.3}, "0.1 B / 2.3 B", blockIOHeader, ctx.BlockIO},
		{StatsEntry{BlockRead: 0.1, BlockWrite: 2.3, IsInvalid: true}, "--", blockIOHeader, ctx.BlockIO},
		{StatsEntry{MemoryPercentage: 10.2}, "10.20%", memPercHeader, ctx.MemPerc},
		{StatsEntry{MemoryPercentage: 10.2, IsInvalid: true}, "--", memPercHeader, ctx.MemPerc},
		{StatsEntry{MemoryPercentage: 10.2, OSType: "windows"}, "--", memPercHeader, ctx.MemPerc},
		{StatsEntry{Memory: 24, MemoryLimit: 30}, "24 B / 30 B", memUseHeader, ctx.MemUsage},
		{StatsEntry{Memory: 24, MemoryLimit: 30, IsInvalid: true}, "-- / --", memUseHeader, ctx.MemUsage},
		{StatsEntry{Memory: 24, MemoryLimit: 30, OSType: "windows"}, "24 B", winMemUseHeader, ctx.MemUsage},
		{StatsEntry{PidsCurrent: 10}, "10", pidsHeader, ctx.PIDs},
		{StatsEntry{PidsCurrent: 10, IsInvalid: true}, "--", pidsHeader, ctx.PIDs},
		{StatsEntry{PidsCurrent: 10, OSType: "windows"}, "--", pidsHeader, ctx.PIDs},
	}

	for _, te := range tt {
		ctx = containerStatsContext{s: te.stats}
		if v := te.call(); v != te.expValue {
			t.Fatalf("Expected %q, got %q", te.expValue, v)
		}

		h := ctx.FullHeader()
		if h != te.expHeader {
			t.Fatalf("Expected %q, got %q", te.expHeader, h)
		}
	}
}

func TestContainerStatsContextWrite(t *testing.T) {
	tt := []struct {
		context  Context
		expected string
	}{
		{
			Context{Format: "{{InvalidFunction}}"},
			`Template parsing error: template: :1: function "InvalidFunction" not defined
`,
		},
		{
			Context{Format: "{{nil}}"},
			`Template parsing error: template: :1:2: executing "" at <nil>: nil is not a command
`,
		},
		{
			Context{Format: "table {{.MemUsage}}"},
			`MEM USAGE / LIMIT
20 B / 20 B
-- / --
`,
		},
		{
			Context{Format: "{{.Container}}  {{.CPUPerc}}"},
			`container1  20.00%
container2  --
`,
		},
	}

	for _, te := range tt {
		stats := []StatsEntry{
			{
				Name:             "container1",
				CPUPercentage:    20,
				Memory:           20,
				MemoryLimit:      20,
				MemoryPercentage: 20,
				NetworkRx:        20,
				NetworkTx:        20,
				BlockRead:        20,
				BlockWrite:       20,
				PidsCurrent:      2,
				IsInvalid:        false,
				OSType:           "linux",
			},
			{
				Name:             "container2",
				CPUPercentage:    30,
				Memory:           30,
				MemoryLimit:      30,
				MemoryPercentage: 30,
				NetworkRx:        30,
				NetworkTx:        30,
				BlockRead:        30,
				BlockWrite:       30,
				PidsCurrent:      3,
				IsInvalid:        true,
				OSType:           "linux",
			},
		}
		var out bytes.Buffer
		te.context.Output = &out
		err := ContainerStatsWrite(te.context, stats)
		if err != nil {
			assert.Error(t, err, te.expected)
		} else {
			assert.Equal(t, out.String(), te.expected)
		}
	}
}

func TestContainerStatsContextWriteWindows(t *testing.T) {
	tt := []struct {
		context  Context
		expected string
	}{
		{
			Context{Format: "table {{.MemUsage}}"},
			`PRIV WORKING SET
20 B
-- / --
`,
		},
		{
			Context{Format: "{{.Container}}  {{.CPUPerc}}"},
			`container1  20.00%
container2  --
`,
		},
		{
			Context{Format: "{{.Container}}  {{.MemPerc}}  {{.PIDs}}"},
			`container1  --  --
container2  --  --
`,
		},
	}

	for _, te := range tt {
		stats := []StatsEntry{
			{
				Name:             "container1",
				CPUPercentage:    20,
				Memory:           20,
				MemoryLimit:      20,
				MemoryPercentage: 20,
				NetworkRx:        20,
				NetworkTx:        20,
				BlockRead:        20,
				BlockWrite:       20,
				PidsCurrent:      2,
				IsInvalid:        false,
				OSType:           "windows",
			},
			{
				Name:             "container2",
				CPUPercentage:    30,
				Memory:           30,
				MemoryLimit:      30,
				MemoryPercentage: 30,
				NetworkRx:        30,
				NetworkTx:        30,
				BlockRead:        30,
				BlockWrite:       30,
				PidsCurrent:      3,
				IsInvalid:        true,
				OSType:           "windows",
			},
		}
		var out bytes.Buffer
		te.context.Output = &out
		err := ContainerStatsWrite(te.context, stats)
		if err != nil {
			assert.Error(t, err, te.expected)
		} else {
			assert.Equal(t, out.String(), te.expected)
		}
	}
}

func TestContainerStatsContextWriteWithNoStats(t *testing.T) {
	var out bytes.Buffer

	contexts := []struct {
		context  Context
		expected string
	}{
		{
			Context{
				Format: "{{.Container}}",
				Output: &out,
			},
			"",
		},
		{
			Context{
				Format: "table {{.Container}}",
				Output: &out,
			},
			"CONTAINER\n",
		},
		{
			Context{
				Format: "table {{.Container}}\t{{.CPUPerc}}",
				Output: &out,
			},
			"CONTAINER           CPU %\n",
		},
	}

	for _, context := range contexts {
		ContainerStatsWrite(context.context, []StatsEntry{})
		assert.Equal(t, context.expected, out.String())
		// Clean buffer
		out.Reset()
	}
}