package main

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"

	"naviwatcher/internal/config"
	"naviwatcher/internal/database"
	"naviwatcher/internal/notifier"
	"naviwatcher/internal/scanner"
	"naviwatcher/internal/web"
)

// TestDataFlowSmoke seeds an in-memory DB with a monitored artist, one local
// album, and a missing external release, then exercises the full
// scan -> notify -> web pipeline end to end:
//   - ScanAll reports the missing release
//   - NotifyOnce (with a stub sender) sends exactly the missing release and
//     marks it as sent, so a second run reports nothing
//   - The Web UI dashboard requires auth and renders the artist + missing count,
//     and the artist detail page renders the missing release
//
// This is the acceptance smoke check for Task 9.
func TestDataFlowSmoke(t *testing.T) {
	db, err := database.New(":memory:")
	if err != nil {
		t.Fatalf("open :memory: db: %v", err)
	}
	defer db.Close()

	ctx := context.Background()

	// Seed: one monitored artist with one local album ...
	if err := database.SaveArtistSettings(db, &database.ArtistSettings{
		ID:        "ar1",
		Name:      "Pink Floyd",
		MBID:      "abcdef",
		Monitored: true,
	}); err != nil {
		t.Fatalf("seed artist: %v", err)
	}
	if err := database.SaveLocalAlbum(db, &database.LocalAlbum{
		ID:       "al1",
		ArtistID: "ar1",
		Title:    "The Wall",
	}); err != nil {
		t.Fatalf("seed local album: %v", err)
	}
	// ... and a missing external release (not present locally).
	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
		RGID:        "rg-missing",
		ArtistID:    "ar1",
		Title:       "Animals",
		Type:        "Album",
		ReleaseDate: "1977-01-01",
	}); err != nil {
		t.Fatalf("seed external release: %v", err)
	}

	// 1) ScanAll should surface exactly the missing release.
	missing, err := scanner.ScanAll(ctx, db, 0.85)
	if err != nil {
		t.Fatalf("ScanAll: %v", err)
	}
	if len(missing) != 1 {
		t.Fatalf("expected 1 missing release, got %d", len(missing))
	}
	if missing[0].RGID != "rg-missing" || missing[0].Title != "Animals" {
		t.Fatalf("unexpected missing release: %+v", missing[0])
	}

	// 2) Notifier: stub sender, first run notifies 1, second run notifies 0.
	var sent []string
	stub := stubSender{onSend: func(msg string) error {
		sent = append(sent, msg)
		return nil
	}}
	tgCfg := config.TelegramConfig{Enabled: true}

	n1, err := notifier.NotifyOnce(ctx, db, stub, tgCfg, "http://localhost:8080")
	if err != nil {
		t.Fatalf("NotifyOnce #1: %v", err)
	}
	if n1 != 1 {
		t.Fatalf("expected NotifyOnce to send 1, got %d", n1)
	}
	if len(sent) != 1 || !strings.Contains(sent[0], "Animals") {
		t.Fatalf("digest missing expected content: %v", sent)
	}

	n2, err := notifier.NotifyOnce(ctx, db, stub, tgCfg, "http://localhost:8080")
	if err != nil {
		t.Fatalf("NotifyOnce #2: %v", err)
	}
	if n2 != 0 {
		t.Fatalf("expected second NotifyOnce to send 0 (already sent), got %d", n2)
	}

	// 3) Web UI: dashboard requires basic auth and renders the artist.
	srvCfg := &config.ServerConfig{
		Host:     "localhost",
		Port:     0,
		Username: "admin",
		Password: "secret",
	}
	srv := web.NewServer(srvCfg, db, "http://localhost:8080", 0)

	// Unauthenticated -> 401.
	rec := httptest.NewRecorder()
	req := httptest.NewRequest(http.MethodGet, "/", nil)
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusUnauthorized {
		t.Fatalf("expected 401 for unauthenticated dashboard, got %d", rec.Code)
	}

	// Authenticated -> 200 with the artist name and missing count.
	rec = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodGet, "/", nil)
	req.SetBasicAuth("admin", "secret")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200 for authenticated dashboard, got %d", rec.Code)
	}
	body := rec.Body.String()
	if !strings.Contains(body, "Pink Floyd") {
		t.Fatalf("dashboard did not render artist name; body head:\n%s", body[:min(400, len(body))])
	}

	// Artist detail page renders the missing release.
	rec = httptest.NewRecorder()
	req = httptest.NewRequest(http.MethodGet, "/artist/ar1", nil)
	req.SetBasicAuth("admin", "secret")
	srv.Handler().ServeHTTP(rec, req)
	if rec.Code != http.StatusOK {
		t.Fatalf("expected 200 for artist page, got %d", rec.Code)
	}
	if !strings.Contains(rec.Body.String(), "Animals") {
		t.Fatalf("artist page did not render missing release 'Animals'")
	}
}

func min(a, b int) int {
	if a < b {
		return a
	}
	return b
}

// stubSender is a test double for notifier.Sender.
type stubSender struct {
	onSend func(message string) error
}

func (s stubSender) Send(_ context.Context, message string) error {
	return s.onSend(message)
}