package main

import (
	"bytes"
	"context"
	"log"
	"os"
	"path/filepath"
	"strings"
	"testing"
	"time"

	"naviwatcher/internal/config"
	"naviwatcher/internal/database"
)

func TestAppRun_ScanLogsMissingReleases(t *testing.T) {
	// Verify the compute-only run() hook scans monitored artists and returns
	// nil without starting notifier/web. Uses an in-memory DB with one
	// monitored artist that has one missing release (Animals) vs a local album
	// (The Wall). The context is left live so the scan actually executes; we
	// cancel shortly after to let run() return cleanly.
	db, err := database.New(":memory:")
	if err != nil {
		t.Fatalf("database.New() error: %v", err)
	}
	defer db.Close()

	if err := database.SaveArtistSettings(db, &database.ArtistSettings{
		ID:        "artist-1",
		Name:      "Pink Floyd",
		Monitored: true,
	}); err != nil {
		t.Fatalf("seed artist: %v", err)
	}
	if err := database.SaveLocalAlbum(db, &database.LocalAlbum{
		ID:       "l1",
		ArtistID: "artist-1",
		Title:    "The Wall",
	}); err != nil {
		t.Fatalf("seed local album: %v", err)
	}
	if err := database.SaveExternalRelease(db, &database.ExternalRelease{
		RGID:     "rg2",
		ArtistID: "artist-1",
		Title:    "Animals",
	}); err != nil {
		t.Fatalf("seed external release: %v", err)
	}

	app := &App{
		cfg: &config.Config{Scanner: config.ScannerConfig{FuzzyThreshold: 0.85}},
		db:  db,
	}

	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Capture run()'s log output so we assert that run() ITSELF performed
	// the scan (not a separately re-run ScanAll). This guards against the
	// hook silently becoming a no-op while still passing.
	var buf bytes.Buffer
	log.SetOutput(&buf)
	defer log.SetOutput(os.Stderr)

	// Run the (blocking) hook in a goroutine; cancel after it has had time to
	// perform the scan so run() returns nil via the ctx.Done() path.
	done := make(chan error, 1)
	go func() { done <- app.run(ctx) }()

	time.Sleep(50 * time.Millisecond)
	cancel()

	if err := <-done; err != nil {
		t.Fatalf("app.run() returned error: %v", err)
	}

	// run() must have logged the missing release (Animals) for artist-1.
	out := buf.String()
	if !strings.Contains(out, "missing: artist=artist-1") || !strings.Contains(out, "Animals") {
		t.Fatalf("app.run() did not log the expected missing release; log output:\n%s", out)
	}
}

func TestConfigIntegration(t *testing.T) {
	// Integration test: write a minimal valid config and load it via config.LoadConfig,
	// verifying the full path that main() uses.
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")

	yaml := `server:
  host: "127.0.0.1"
  port: 9090
navidrome:
  url: "http://localhost:4533"
  user: "test"
  password: "test"
musicbrainz:
  user_agent: "NaviWatcher/1.0 ( test@example.com )"
`
	if err := os.WriteFile(path, []byte(yaml), 0644); err != nil {
		t.Fatalf("failed to write config: %v", err)
	}

	cfg, err := config.LoadConfig(path)
	if err != nil {
		t.Fatalf("LoadConfig returned error: %v", err)
	}

	if cfg.Server.Host != "127.0.0.1" {
		t.Errorf("expected host 127.0.0.1, got %q", cfg.Server.Host)
	}
	if cfg.Server.Port != 9090 {
		t.Errorf("expected port 9090, got %d", cfg.Server.Port)
	}
	if cfg.Navidrome.URL != "http://localhost:4533" {
		t.Errorf("expected navidrome url http://localhost:4533, got %q", cfg.Navidrome.URL)
	}
}

func TestNewApp_CreatesMusicBrainzClient(t *testing.T) {
	// Verify that NewApp initializes the MusicBrainz client from config.
	cfg := &config.Config{
		Server: config.ServerConfig{
			Host: "127.0.0.1",
			Port: 9090,
		},
		Navidrome: config.NavidromeConfig{
			URL:      "http://localhost:4533",
			User:     "test",
			Password: "test",
		},
		MusicBrainz: config.MusicBrainzConfig{
			UserAgent: "NaviWatcher/1.0 ( test@example.com )",
		},
	}

	ctx := context.Background()
	app, err := NewApp(ctx, cfg, ":memory:")
	if err != nil {
		t.Fatalf("NewApp returned error: %v", err)
	}
	defer app.Close()

	if app.mbClient == nil {
		t.Fatal("expected MusicBrainz client to be initialized, got nil")
	}
	if app.db == nil {
		t.Fatal("expected database to be initialized, got nil")
	}
	if app.cfg != cfg {
		t.Fatal("expected app.cfg to be the config passed to NewApp")
	}
}

func TestNewApp_GracefulShutdown(t *testing.T) {
	// Verify that App.Close() cleans up resources without error.
	cfg := &config.Config{
		Server: config.ServerConfig{
			Host: "127.0.0.1",
			Port: 9090,
		},
		Navidrome: config.NavidromeConfig{
			URL:      "http://localhost:4533",
			User:     "test",
			Password: "test",
		},
		MusicBrainz: config.MusicBrainzConfig{
			UserAgent: "NaviWatcher/1.0 ( test@example.com )",
		},
	}

	ctx := context.Background()
	app, err := NewApp(ctx, cfg, ":memory:")
	if err != nil {
		t.Fatalf("NewApp returned error: %v", err)
	}

	// Close should not panic or return error.
	app.Close()
}

func TestAppRun_GracefulShutdown(t *testing.T) {
	// Verify that app.run() returns nil when context is cancelled.
	cfg := &config.Config{
		Server: config.ServerConfig{
			Host: "127.0.0.1",
			Port: 9090,
		},
		Navidrome: config.NavidromeConfig{
			URL:      "http://localhost:4533",
			User:     "test",
			Password: "test",
		},
		MusicBrainz: config.MusicBrainzConfig{
			UserAgent: "NaviWatcher/1.0 ( test@example.com )",
		},
	}

	ctx, cancel := context.WithCancel(context.Background())

	app, err := NewApp(ctx, cfg, ":memory:")
	if err != nil {
		t.Fatalf("NewApp returned error: %v", err)
	}
	defer app.Close()

	// Cancel the context to trigger shutdown.
	cancel()

	if err := app.run(ctx); err != nil {
		t.Fatalf("app.run returned error: %v", err)
	}
}

func TestMusicBrainzUserAgentValidation(t *testing.T) {
	// Verify that config validation requires MusicBrainz.UserAgent to be set.
	dir := t.TempDir()
	path := filepath.Join(dir, "config.yaml")

	yaml := `server:
  host: "127.0.0.1"
  port: 9090
navidrome:
  url: "http://localhost:4533"
  user: "test"
  password: "test"
musicbrainz:
  user_agent: ""
`
	if err := os.WriteFile(path, []byte(yaml), 0644); err != nil {
		t.Fatalf("failed to write config: %v", err)
	}

	_, err := config.LoadConfig(path)
	if err == nil {
		t.Fatal("expected config validation error for empty musicbrainz.user_agent, got nil")
	}
}