//go:build e2e

package main

import (
	"bytes"
	"context"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"strings"
	"testing"
	"time"

	"github.com/testcontainers/testcontainers-go"
	"github.com/testcontainers/testcontainers-go/log"
	"github.com/testcontainers/testcontainers-go/modules/mockserver"
	"github.com/testcontainers/testcontainers-go/network"
	"github.com/testcontainers/testcontainers-go/wait"
)

const mockServerImage = "mockserver/mockserver:5.15.0@sha256:0f9ef78c94894ac3e70135d156193b25e23872575d58e2228344964273b4af6b"

type mockRecordedRequest struct {
	Method  string              `json:"method"`
	Path    string              `json:"path"`
	Headers map[string][]string `json:"headers"`
	Body    struct {
		RawBytes string `json:"rawBytes"`
	} `json:"body"`
}

func TestContainerE2E(t *testing.T) {
	ctx, cancel := context.WithTimeout(context.Background(), 4*time.Minute)
	defer cancel()
	logger := log.TestLogger(t)

	testNetwork, err := network.New(ctx)
	if err != nil {
		t.Fatal(err)
	}
	testcontainers.CleanupNetwork(t, testNetwork)

	mock, err := mockserver.Run(ctx, mockServerImage,
		network.WithNetwork([]string{"discord-mock"}, testNetwork),
		testcontainers.WithLogger(logger),
	)
	testcontainers.CleanupContainer(t, mock)
	if err != nil {
		t.Fatalf("start MockServer: %v", err)
	}
	mockURL, err := mock.URL(ctx)
	if err != nil {
		t.Fatal(err)
	}

	buildPlatform := "linux/amd64"
	targetOS := "linux"
	targetArch := "amd64"
	app, err := testcontainers.Run(ctx, "",
		testcontainers.WithDockerfile(testcontainers.FromDockerfile{
			Context:    ".",
			Dockerfile: "Dockerfile",
			Repo:       "haven-notify-e2e",
			Tag:        "test",
			KeepImage:  false,
			BuildArgs: map[string]*string{
				"BUILDPLATFORM": &buildPlatform,
				"TARGETOS":      &targetOS,
				"TARGETARCH":    &targetArch,
			},
		}),
		network.WithNetwork([]string{"haven-notify"}, testNetwork),
		testcontainers.WithEnv(map[string]string{"WEBHOOK_URL": "http://discord-mock:1080/discord"}),
		testcontainers.WithExposedPorts("8080/tcp"),
		testcontainers.WithWaitStrategy(wait.ForHTTP("/ready").WithPort("8080/tcp").WithStartupTimeout(45*time.Second)),
		testcontainers.WithLogger(logger),
	)
	testcontainers.CleanupContainer(t, app)
	if err != nil {
		t.Fatalf("start Haven Notify: %v", err)
	}
	appURL, err := app.PortEndpoint(ctx, "8080/tcp", "http")
	if err != nil {
		t.Fatal(err)
	}
	inspect, err := app.Inspect(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if inspect.Config.User != "haven-notify" {
		t.Fatalf("container user = %q", inspect.Config.User)
	}

	t.Run("health probes", func(t *testing.T) {
		for path, body := range map[string]string{"/ready": "Ready", "/live": "Alive"} {
			response, err := http.Get(appURL + path)
			if err != nil {
				t.Fatal(err)
			}
			contents, _ := io.ReadAll(response.Body)
			_ = response.Body.Close()
			if response.StatusCode != 200 || string(contents) != body {
				t.Fatalf("%s = (%d, %q)", path, response.StatusCode, contents)
			}
		}
	})

	if err := configureMock(mockURL, []mockExpectation{{Status: 204}}); err != nil {
		t.Fatal(err)
	}
	cases := []struct {
		path string
		body string
		want discordPayload
	}{
		{
			path: "/notify",
			body: `{"title":"Título \"quoted\"","message":"line 1\nC:\\backups @everyone"}`,
			want: discordPayload{
				Content:         "**Título \"quoted\"**\nline 1\nC:\\backups @everyone",
				AllowedMentions: discordAllowedMentions{Parse: []string{}},
			},
		},
		{
			path: "/template/notify/backup",
			body: `{"title":"Nightly","asset":"photos","backupSizeInMB":1536,"extra":[{"name":"Host","value":"nebula"}]}`,
			want: discordPayload{
				Embeds: []discordEmbed{{
					Title:       "📦 Backup - Nightly",
					Description: "**photos** has been backed up successfully! ✅🫡\n",
					Color:       3066993,
					Fields: []discordEmbedField{
						{Name: "💾 Backup Size", Value: "1.50 GiB", Inline: true},
						{Name: "Host", Value: "nebula", Inline: true},
					},
					Footer: &discordEmbedFooter{Text: "✨ Haven Notify ✨"},
				}},
				AllowedMentions: discordAllowedMentions{Parse: []string{}},
			},
		},
		{
			path: "/template/notify/update",
			body: `{"host":"nexus","asset":"k3s","time":0}`,
			want: discordPayload{
				Embeds: []discordEmbed{{
					Title:       "🔄 Update - k3s",
					Description: "**nexus** has successfully updated **k3s**! ✅",
					Color:       3447003,
					Fields: []discordEmbedField{
						{Name: "⏱️ Time Taken", Value: "0 seconds", Inline: true},
					},
					Footer: &discordEmbedFooter{Text: "✨ Haven Notify ✨"},
				}},
				AllowedMentions: discordAllowedMentions{Parse: []string{}},
			},
		},
		{
			path: "/template/notify/error",
			body: `{"caller":"backup","message":"line 1\n\"quoted\" <tag>","critical":true}`,
			want: discordPayload{
				Embeds: []discordEmbed{{
					Title:       "❌ Error",
					Description: "**backup** encountered an error!",
					Color:       15158332,
					Fields: []discordEmbedField{
						{Name: "📄 Message", Value: "line 1\n\"quoted\" <tag>", Inline: false},
					},
					Footer: &discordEmbedFooter{Text: "✨ Haven Notify ✨"},
				}},
				AllowedMentions: discordAllowedMentions{Parse: []string{}},
			},
		},
	}
	for _, test := range cases {
		response, err := postJSON(appURL+test.path, test.body)
		if err != nil {
			t.Fatalf("POST %s: %v", test.path, err)
		}
		contents, _ := io.ReadAll(response.Body)
		_ = response.Body.Close()
		if response.StatusCode != 200 || string(contents) != "Notification sent" {
			t.Fatalf("POST %s = (%d, %q)", test.path, response.StatusCode, contents)
		}
	}
	recorded, err := retrieveMockRequests(mockURL)
	if err != nil {
		t.Fatal(err)
	}
	if len(recorded) != len(cases) {
		t.Fatalf("recorded requests = %d, want %d", len(recorded), len(cases))
	}
	for index, request := range recorded {
		if request.Method != http.MethodPost || request.Path != "/discord" || len(request.Headers["Content-Type"]) == 0 || request.Headers["Content-Type"][0] != "application/json" {
			t.Fatalf("recorded request %d = %+v", index, request)
		}
		body, err := base64.StdEncoding.DecodeString(request.Body.RawBytes)
		if err != nil || !json.Valid(body) || bytes.Contains(body, []byte("&#34;")) {
			t.Fatalf("recorded body %d = %s, %v", index, body, err)
		}
		want, err := json.Marshal(cases[index].want)
		if err != nil {
			t.Fatal(err)
		}
		if !bytes.Equal(body, want) {
			t.Fatalf("recorded body %d = %s, want %s", index, body, want)
		}
	}

	t.Run("invalid request does not call webhook", func(t *testing.T) {
		if err := configureMock(mockURL, []mockExpectation{{Status: 204}}); err != nil {
			t.Fatal(err)
		}
		response, err := postJSON(appURL+"/notify", `{"title":"missing message"}`)
		if err != nil {
			t.Fatal(err)
		}
		_ = response.Body.Close()
		if response.StatusCode != 400 {
			t.Fatalf("status = %d", response.StatusCode)
		}
		recorded, err := retrieveMockRequests(mockURL)
		if err != nil || len(recorded) != 0 {
			t.Fatalf("recorded = %d, error = %v", len(recorded), err)
		}
	})

	t.Run("transient failure retries", func(t *testing.T) {
		if err := configureMock(mockURL, []mockExpectation{{Status: 500, Times: 1, Priority: 10}, {Status: 204}}); err != nil {
			t.Fatal(err)
		}
		response, err := postJSON(appURL+"/notify", `{"title":"retry","message":"once"}`)
		if err != nil {
			t.Fatal(err)
		}
		_ = response.Body.Close()
		if response.StatusCode != 200 {
			t.Fatalf("status = %d", response.StatusCode)
		}
		recorded, err := retrieveMockRequests(mockURL)
		if err != nil || len(recorded) != 2 {
			t.Fatalf("recorded = %d, error = %v", len(recorded), err)
		}
	})

	bad, err := testcontainers.Run(ctx, "haven-notify-e2e:test",
		testcontainers.WithWaitStrategy(wait.ForExit().WithExitTimeout(15*time.Second)),
		testcontainers.WithLogger(logger),
	)
	testcontainers.CleanupContainer(t, bad)
	if err != nil {
		t.Fatalf("start unconfigured container: %v", err)
	}
	state, err := bad.State(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if state.Running || state.ExitCode == 0 {
		t.Fatalf("unconfigured container state = %+v", state)
	}
}

type mockExpectation struct {
	Status   int
	Times    int
	Priority int
}

func configureMock(baseURL string, expectations []mockExpectation) error {
	request, _ := http.NewRequest(http.MethodPut, baseURL+"/mockserver/reset", nil)
	response, err := http.DefaultClient.Do(request)
	if err != nil {
		return err
	}
	_ = response.Body.Close()
	for _, expectation := range expectations {
		payload := map[string]any{
			"httpRequest":  map[string]any{"method": "POST", "path": "/discord"},
			"httpResponse": map[string]any{"statusCode": expectation.Status},
			"priority":     expectation.Priority,
		}
		if expectation.Times > 0 {
			payload["times"] = map[string]any{"remainingTimes": expectation.Times, "unlimited": false}
		}
		body, _ := json.Marshal(payload)
		request, _ = http.NewRequest(http.MethodPut, baseURL+"/mockserver/expectation", bytes.NewReader(body))
		request.Header.Set("Content-Type", "application/json")
		response, err = http.DefaultClient.Do(request)
		if err != nil {
			return err
		}
		_ = response.Body.Close()
		if response.StatusCode < 200 || response.StatusCode >= 300 {
			return fmt.Errorf("MockServer expectation returned %d", response.StatusCode)
		}
	}
	return nil
}

func retrieveMockRequests(baseURL string) ([]mockRecordedRequest, error) {
	request, _ := http.NewRequest(http.MethodPut, baseURL+"/mockserver/retrieve?type=REQUESTS&format=JSON", strings.NewReader(`{"path":"/discord"}`))
	request.Header.Set("Content-Type", "application/json")
	response, err := http.DefaultClient.Do(request)
	if err != nil {
		return nil, err
	}
	defer response.Body.Close()
	var recorded []mockRecordedRequest
	err = json.NewDecoder(response.Body).Decode(&recorded)
	return recorded, err
}

func postJSON(url, body string) (*http.Response, error) {
	request, err := http.NewRequest(http.MethodPost, url, strings.NewReader(body))
	if err != nil {
		return nil, err
	}
	request.Header.Set("Content-Type", "application/json")
	return http.DefaultClient.Do(request)
}