package api

import (
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/ponzischeme89/memby/server/internal/appupdate"
	"github.com/ponzischeme89/memby/server/internal/config"
	serverlogging "github.com/ponzischeme89/memby/server/internal/logging"
	"github.com/ponzischeme89/memby/server/internal/store"
)

func TestUpdateStatusIsPublicAndAvailableDuringMaintenance(t *testing.T) {
	server := testServer(config.Config{})
	server.updatePolicy.set(appupdate.Policy{
		Enabled:        true,
		LatestVersion:  "0.3.0",
		MinimumVersion: "0.2.9",
		DownloadURL:    "/updates/memby-0.3.0.apk?token=signed",
	})
	server.maintenance.set(store.Maintenance{Enabled: true, Message: "Deploying"})

	req := httptest.NewRequest(http.MethodGet, "/v1/update", nil)
	req.Header.Set("X-Memby-Version", "0.2.8")
	rec := httptest.NewRecorder()
	// Deliberately no Authorization header: update policy must precede login.
	server.Routes().ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body = %s", rec.Code, rec.Body.String())
	}
	var decision appupdate.Decision
	if err := json.Unmarshal(rec.Body.Bytes(), &decision); err != nil {
		t.Fatalf("decode decision: %v", err)
	}
	if decision.Status != appupdate.StatusMandatory {
		t.Fatalf("status = %q, want mandatory", decision.Status)
	}
}

func TestUpdateOfferLogNamesTheAffectedViewer(t *testing.T) {
	logger, events := serverlogging.NewBuffered(io.Discard, slog.LevelInfo, 10, serverlogging.FormatConsole)
	server := New(config.Config{}, Deps{Log: logger, Events: events})
	server.updatePolicy.set(appupdate.Policy{
		Enabled:       true,
		LatestVersion: "0.2.44",
		DownloadURL:   "/updates/memby-0.2.44.apk",
	})

	req := httptest.NewRequest(http.MethodGet, "/v1/update", nil)
	req.Header.Set("X-Memby-Version", "0.2.38")
	req, _ = withRequestIdentity(req)
	identify(req.Context(), store.Session{Username: "matt", DeviceName: "Living room"})
	server.handleUpdate(httptest.NewRecorder(), req)

	page := events.Events(0, 10)
	if len(page.Events) != 1 {
		t.Fatalf("events = %d, want 1", len(page.Events))
	}
	event := page.Events[0]
	if event.Message != "update offered" || event.Attributes["user"] != "matt" {
		t.Fatalf("update event was not attributed to the viewer: %+v", event)
	}
}

func TestConfiguredFloorForcesClientsBelow0244(t *testing.T) {
	server := testServer(config.Config{})
	server.updatePolicy.set(appupdate.Policy{
		Enabled:            true,
		LatestVersion:      "0.2.44",
		RetireBelowVersion: "0.2.44",
		DownloadURL:        "/updates/memby-0.2.44.apk?token=signed",
	})

	for version, want := range map[string]string{
		"0.2.43": appupdate.StatusMandatory,
		"0.2.44": appupdate.StatusNone,
		"0.2.45": appupdate.StatusNone,
	} {
		req := httptest.NewRequest(http.MethodGet, "/v1/update", nil)
		req.Header.Set("X-Memby-Version", version)
		rec := httptest.NewRecorder()
		server.handleUpdate(rec, req)

		var decision appupdate.Decision
		if err := json.Unmarshal(rec.Body.Bytes(), &decision); err != nil {
			t.Fatalf("%s: decode decision: %v", version, err)
		}
		if decision.Status != want {
			t.Errorf("%s: status = %q, want %q", version, decision.Status, want)
		}
	}
}

func TestConfiguredFloorWaitsForAnActionableRelease(t *testing.T) {
	for name, policy := range map[string]appupdate.Policy{
		"disabled": {
			LatestVersion: "0.2.44", RetireBelowVersion: "0.2.44",
			DownloadURL: "/updates/memby-0.2.44.apk",
		},
		"missing download": {
			Enabled: true, LatestVersion: "0.2.44", RetireBelowVersion: "0.2.44",
		},
		"release too old": {
			Enabled: true, LatestVersion: "0.2.43", RetireBelowVersion: "0.2.44",
			DownloadURL: "/updates/memby-0.2.43.apk",
		},
	} {
		t.Run(name, func(t *testing.T) {
			decision := appupdate.Decide(effectiveUpdatePolicy(policy), "0.2.43")
			if mustRetireForUpdate(decision, "0.2.43", destructiveUpdateFloor(policy)) {
				t.Fatal("client would be retired without an actionable release at the configured floor")
			}
		})
	}
}

func TestSelectedDestructiveFloorRetiresClientsBelowRelease(t *testing.T) {
	policy := appupdate.Policy{
		Enabled:            true,
		LatestVersion:      "0.3.0",
		RetireBelowVersion: "0.3.0",
		DownloadURL:        "/updates/memby-0.3.0.apk?token=signed",
	}

	for version, want := range map[string]bool{
		"0.2.99": true,
		"0.3.0":  false,
		"0.3.1":  false,
	} {
		decision := appupdate.Decide(effectiveUpdatePolicy(policy), version)
		if got := mustRetireForUpdate(decision, version, destructiveUpdateFloor(policy)); got != want {
			t.Errorf("%s: retired = %t, want %t", version, got, want)
		}
	}
}

func TestRequiredUpdateDoesNotRetireSupportedClient(t *testing.T) {
	policy := appupdate.Policy{
		Enabled:        true,
		LatestVersion:  "0.3.0",
		MinimumVersion: "0.3.0",
		DownloadURL:    "/updates/memby-0.3.0.apk?token=signed",
	}
	decision := appupdate.Decide(effectiveUpdatePolicy(policy), "0.2.44")
	if decision.Status != appupdate.StatusMandatory {
		t.Fatalf("status = %q, want mandatory", decision.Status)
	}
	if mustRetireForUpdate(decision, "0.2.44", destructiveUpdateFloor(policy)) {
		t.Fatal("ordinary required update retired a supported client")
	}
}

func TestRetiredClientCannotSignBackIn(t *testing.T) {
	server := testServer(config.Config{})
	server.updatePolicy.set(appupdate.Policy{
		Enabled:            true,
		LatestVersion:      "0.2.44",
		RetireBelowVersion: "0.2.44",
		DownloadURL:        "/updates/memby-0.2.44.apk?token=signed",
	})
	reached := false
	handler := server.requireSupportedClient(func(http.ResponseWriter, *http.Request) {
		reached = true
	})
	req := httptest.NewRequest(http.MethodPost, "/v1/auth/login", nil)
	req.Header.Set("X-Memby-Version", "0.2.43")
	rec := httptest.NewRecorder()

	handler(rec, req)

	if reached {
		t.Fatal("retired client reached the login handler")
	}
	if rec.Code != http.StatusUpgradeRequired {
		t.Fatalf("status = %d, want 426", rec.Code)
	}
	if rec.Header().Get("X-Memby-Update-Required") != "0.2.44" {
		t.Fatalf("required update header = %q", rec.Header().Get("X-Memby-Update-Required"))
	}
}