package db_test

import (
	"context"
	"encoding/base64"
	"path/filepath"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"lmika.dev/lmika/weiro/models"
	"lmika.dev/lmika/weiro/providers/db"

	_ "modernc.org/sqlite"
)

func newTestDB(t *testing.T) *db.Provider {
	t.Helper()
	dbFile := filepath.Join(t.TempDir(), "test.db")
	p, err := db.New(dbFile)
	require.NoError(t, err)
	t.Cleanup(func() { p.Close() })
	return p
}

func TestProvider_Users(t *testing.T) {
	ctx := context.Background()
	p := newTestDB(t)

	t.Run("save and select user", func(t *testing.T) {
		user := &models.User{
			Username:       "alice",
			PasswordHashed: []byte("hashed-password"),
		}

		err := p.SaveUser(ctx, user)
		require.NoError(t, err)
		assert.NotZero(t, user.ID)

		got, err := p.SelectUserByUsername(ctx, "alice")
		require.NoError(t, err)
		assert.Equal(t, user.ID, got.ID)
		assert.Equal(t, "alice", got.Username)
		assert.Equal(t, []byte("hashed-password"), got.PasswordHashed)
	})

	t.Run("update user", func(t *testing.T) {
		user := &models.User{
			Username:       "bob",
			PasswordHashed: []byte("old-password"),
		}
		err := p.SaveUser(ctx, user)
		require.NoError(t, err)

		user.Username = "bob"
		user.PasswordHashed = []byte("new-password")
		err = p.SaveUser(ctx, user)
		require.NoError(t, err)

		got, err := p.SelectUserByUsername(ctx, "bob")
		require.NoError(t, err)
		assert.Equal(t, []byte("new-password"), got.PasswordHashed)
	})
}

func TestProvider_Sites(t *testing.T) {
	ctx := context.Background()
	p := newTestDB(t)

	// Create a user first (sites need an owner)
	user := &models.User{
		Username:       "testuser",
		PasswordHashed: []byte("password"),
	}
	require.NoError(t, p.SaveUser(ctx, user))

	t.Run("save and select sites", func(t *testing.T) {
		site := &models.Site{
			OwnerID: user.ID,
			Title:   "My Blog",
			Tagline: "A test blog",
		}

		err := p.SaveSite(ctx, site)
		require.NoError(t, err)
		assert.NotZero(t, site.ID)

		sites, err := p.SelectSitesOwnedByUser(ctx, user.ID)
		require.NoError(t, err)
		require.Len(t, sites, 1)
		assert.Equal(t, site.ID, sites[0].ID)
		assert.Equal(t, user.ID, sites[0].OwnerID)
		assert.Equal(t, "My Blog", sites[0].Title)
		assert.Equal(t, "A test blog", sites[0].Tagline)
	})

	t.Run("select site by id", func(t *testing.T) {
		site := &models.Site{
			OwnerID: user.ID,
			Title:   "Lookup Blog",
			Tagline: "Find me by ID",
		}
		require.NoError(t, p.SaveSite(ctx, site))

		got, err := p.SelectSiteByID(ctx, site.ID)
		require.NoError(t, err)
		assert.Equal(t, site.ID, got.ID)
		assert.Equal(t, user.ID, got.OwnerID)
		assert.Equal(t, "Lookup Blog", got.Title)
		assert.Equal(t, "Find me by ID", got.Tagline)
	})

	t.Run("select sites for user with no sites", func(t *testing.T) {
		otherUser := &models.User{
			Username:       "otheruser",
			PasswordHashed: []byte("password"),
		}
		require.NoError(t, p.SaveUser(ctx, otherUser))

		sites, err := p.SelectSitesOwnedByUser(ctx, otherUser.ID)
		require.NoError(t, err)
		assert.Empty(t, sites)
	})
}

func TestProvider_Posts(t *testing.T) {
	ctx := context.Background()
	p := newTestDB(t)

	// Create user and site
	user := &models.User{
		Username:       "testuser",
		PasswordHashed: []byte("password"),
	}
	require.NoError(t, p.SaveUser(ctx, user))

	site := &models.Site{
		OwnerID: user.ID,
		Title:   "My Blog",
		Tagline: "A test blog",
	}
	require.NoError(t, p.SaveSite(ctx, site))

	t.Run("save and select posts", func(t *testing.T) {
		now := time.Date(2026, 2, 19, 12, 0, 0, 0, time.UTC)
		post := &models.Post{
			SiteID:      site.ID,
			GUID:        "post-001",
			Title:       "First Post",
			Body:        "Hello world",
			Slug:        "/2026/02/19/first-post",
			CreatedAt:   now,
			PublishedAt: now,
		}

		err := p.SavePost(ctx, post)
		require.NoError(t, err)
		assert.NotZero(t, post.ID)

		posts, err := p.SelectPostsOfSite(ctx, site.ID)
		require.NoError(t, err)
		require.Len(t, posts, 1)
		assert.Equal(t, post.ID, posts[0].ID)
		assert.Equal(t, site.ID, posts[0].SiteID)
		assert.Equal(t, "post-001", posts[0].GUID)
		assert.Equal(t, "First Post", posts[0].Title)
		assert.Equal(t, "Hello world", posts[0].Body)
		assert.Equal(t, "/2026/02/19/first-post", posts[0].Slug)
		assert.Equal(t, now, posts[0].CreatedAt)
		assert.Equal(t, now, posts[0].PublishedAt)
	})

	t.Run("posts ordered by created_at desc", func(t *testing.T) {
		// Create a second site to isolate this test
		site2 := &models.Site{
			OwnerID: user.ID,
			Title:   "Second Blog",
			Tagline: "",
		}
		require.NoError(t, p.SaveSite(ctx, site2))

		earlier := time.Date(2026, 1, 1, 0, 0, 0, 0, time.UTC)
		later := time.Date(2026, 2, 1, 0, 0, 0, 0, time.UTC)

		post1 := &models.Post{
			SiteID:      site2.ID,
			GUID:        "old-post",
			Title:       "Old Post",
			Body:        "old",
			Slug:        "/old",
			CreatedAt:   earlier,
			PublishedAt: earlier,
		}
		post2 := &models.Post{
			SiteID:      site2.ID,
			GUID:        "new-post",
			Title:       "New Post",
			Body:        "new",
			Slug:        "/new",
			CreatedAt:   later,
			PublishedAt: later,
		}

		require.NoError(t, p.SavePost(ctx, post1))
		require.NoError(t, p.SavePost(ctx, post2))

		posts, err := p.SelectPostsOfSite(ctx, site2.ID)
		require.NoError(t, err)
		require.Len(t, posts, 2)
		assert.Equal(t, "New Post", posts[0].Title)
		assert.Equal(t, "Old Post", posts[1].Title)
	})

	t.Run("select posts for site with no posts", func(t *testing.T) {
		emptySite := &models.Site{
			OwnerID: user.ID,
			Title:   "Empty Blog",
			Tagline: "",
		}
		require.NoError(t, p.SaveSite(ctx, emptySite))

		posts, err := p.SelectPostsOfSite(ctx, emptySite.ID)
		require.NoError(t, err)
		assert.Empty(t, posts)
	})
}

func TestProvider_PublishTargets(t *testing.T) {
	ctx := context.Background()
	p := newTestDB(t)

	// Create user and site
	user := &models.User{
		Username:       "testuser",
		PasswordHashed: []byte("password"),
	}
	require.NoError(t, p.SaveUser(ctx, user))

	site := &models.Site{
		OwnerID: user.ID,
		Title:   "My Blog",
		Tagline: "A test blog",
	}
	require.NoError(t, p.SaveSite(ctx, site))

	t.Run("save and select publish targets", func(t *testing.T) {
		target := &models.SitePublishTarget{
			SiteID:     site.ID,
			TargetType: models.PublishTargetTypeNetlify,
			BaseURL:    "https://example.netlify.app",
			TargetRef:  "netlify-site-123",
			TargetKey:  "secret-key",
		}

		err := p.SavePublishTarget(ctx, target)
		require.NoError(t, err)
		assert.NotZero(t, target.ID)

		targets, err := p.SelectPublishTargetsOfSite(ctx, site.ID)
		require.NoError(t, err)
		require.Len(t, targets, 1)
		assert.Equal(t, target.ID, targets[0].ID)
		assert.Equal(t, site.ID, targets[0].SiteID)
		assert.Equal(t, models.PublishTargetTypeNetlify, targets[0].TargetType)
		assert.Equal(t, "https://example.netlify.app", targets[0].BaseURL)
		assert.Equal(t, "netlify-site-123", targets[0].TargetRef)
		assert.Equal(t, "secret-key", targets[0].TargetKey)
	})

	t.Run("select targets for site with no targets", func(t *testing.T) {
		emptySite := &models.Site{
			OwnerID: user.ID,
			Title:   "No Targets",
			Tagline: "",
		}
		require.NoError(t, p.SaveSite(ctx, emptySite))

		targets, err := p.SelectPublishTargetsOfSite(ctx, emptySite.ID)
		require.NoError(t, err)
		assert.Empty(t, targets)
	})
}

// Verify that password encoding roundtrips correctly through base64
func TestProvider_UserPasswordEncoding(t *testing.T) {
	ctx := context.Background()
	p := newTestDB(t)

	// Use bytes that aren't valid UTF-8 to verify binary safety
	rawPassword := []byte{0x00, 0xff, 0x80, 0x7f, 0x01}

	user := &models.User{
		Username:       "binuser",
		PasswordHashed: rawPassword,
	}
	require.NoError(t, p.SaveUser(ctx, user))

	got, err := p.SelectUserByUsername(ctx, "binuser")
	require.NoError(t, err)
	assert.Equal(t, rawPassword, got.PasswordHashed)

	// Verify it's stored as base64 (not raw bytes) - this is implicit
	// from the implementation but good to confirm the roundtrip works
	_ = base64.StdEncoding.EncodeToString(rawPassword)
}