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package dal

import (
	"context"
	"io"
	"path/filepath"
	"rss_parrot/shared"
	"slices"
	"strings"
	"testing"
	"time"
)

const testHandle = "blog.example.org"

// newPublishRepo returns a fresh, migrated database with one feed account,
// and that account's id.
func newPublishRepo(t *testing.T) (*Repo, int) {
	t.Helper()
	cfg := &shared.Config{
		DbFile: filepath.Join(t.TempDir(), "test.db"),
		Birb:   &shared.UserInfo{User: "birb"},
	}
	repo := NewRepo(cfg, shared.NewLogger(io.Discard, "Error")).(*Repo)
	repo.InitUpdateDb()
	if _, err := repo.AddAccountIfNotExist(&Account{
		CreatedAt: time.Now(), Handle: testHandle, UserUrl: "https://kakapo.example.org/u/" + testHandle,
	}, ""); err != nil {
		t.Fatal(err)
	}
	acct, err := repo.GetAccount(testHandle)
	if err != nil {
		t.Fatal(err)
	}
	return repo, acct.Id
}

// addDueItem adds one item to the ledger, due for tooting.
func addDueItem(t *testing.T, repo *Repo, accountId int, guid string) *FeedItem {
	t.Helper()
	now := time.Now().UTC()
	itm := &FeedItem{
		AccountId: accountId, Guid: guid, LinkKey: "blog.example.org/" + guid,
		PostTime: now, FirstSeen: now, Status: ItemDue,
		Link: "https://blog.example.org/" + guid, Title: "Post " + guid, Description: "About " + guid,
	}
	if err := repo.AddFeedItems(accountId, []*FeedItem{itm}, true); err != nil {
		t.Fatal(err)
	}
	return itm
}

func countRows(t *testing.T, repo *Repo, table string) int {
	t.Helper()
	var n int
	if err := repo.db.QueryRow(`SELECT COUNT(*) FROM ` + table).Scan(&n); err != nil {
		t.Fatal(err)
	}
	return n
}

func itemStatus(t *testing.T, repo *Repo, id int64) int {
	t.Helper()
	var status int
	if err := repo.db.QueryRow(`SELECT status FROM feed_items WHERE id=?`, id).Scan(&status); err != nil {
		t.Fatal(err)
	}
	return status
}

func testToot(id string) *Toot {
	return &Toot{
		TootedAt: time.Now().UTC(), Content: "toot " + id,
		StatusId: "https://kakapo.example.org/u/" + testHandle + "/status/" + id,
	}
}

func TestPublishItemQueuesOncePerApprovedInbox(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	for _, f := range []*FollowerInfo{
		// Two on the same instance share its inbox.
		{UserUrl: "https://social.example/users/a", ApproveStatus: 1,
			UserInbox: "https://social.example/users/a/inbox", SharedInbox: "https://social.example/inbox"},
		{UserUrl: "https://social.example/users/b", ApproveStatus: 1,
			UserInbox: "https://social.example/users/b/inbox", SharedInbox: "https://social.example/inbox"},
		// One without a shared inbox gets its own.
		{UserUrl: "https://lone.example/users/c", ApproveStatus: 1,
			UserInbox: "https://lone.example/users/c/inbox"},
		// Not approved: gets nothing.
		{UserUrl: "https://other.example/users/d", ApproveStatus: 0,
			UserInbox: "https://other.example/users/d/inbox", SharedInbox: "https://other.example/inbox"},
	} {
		if err := repo.AddFollower(testHandle, f); err != nil {
			t.Fatal(err)
		}
	}
	itm := addDueItem(t, repo, acctId, "1")
	toot := testToot("1")

	published, err := repo.PublishItem(itm, toot, true)
	if err != nil || !published {
		t.Fatalf("PublishItem = %v, %v; want true, nil", published, err)
	}

	queued, err := repo.GetTootQueueItems(0, 100)
	if err != nil {
		t.Fatal(err)
	}
	var inboxes []string
	for _, q := range queued {
		inboxes = append(inboxes, q.ToInbox)
		if q.SendingUser != testHandle || q.StatusId != toot.StatusId || q.Content != toot.Content ||
			!q.TootedAt.Equal(toot.TootedAt) {
			t.Errorf("queued %+v, want the toot %+v sent by %s", q, toot, testHandle)
		}
	}
	slices.Sort(inboxes)
	if want := []string{"https://lone.example/users/c/inbox", "https://social.example/inbox"}; !slices.Equal(inboxes, want) {
		t.Errorf("queued for %v, want %v", inboxes, want)
	}

	// The content is stored once, in toots; a delivery only refers to it.
	var copies int
	if err := repo.db.QueryRow(`SELECT COUNT(*) FROM toots WHERE content=?`, toot.Content).Scan(&copies); err != nil ||
		copies != 1 {
		t.Errorf("content stored %d times (%v), want once", copies, err)
	}
	if n := countRows(t, repo, "toot_deliveries"); n != 2 {
		t.Errorf("%d deliveries, want 2", n)
	}

	if got, err := repo.GetToot(toot.StatusId); err != nil || got == nil || got.Content != toot.Content {
		t.Errorf("GetToot = %+v, %v; want the toot", got, err)
	}
	posts, err := repo.GetPostsPage(acctId, 0, 10)
	if err != nil {
		t.Fatal(err)
	}
	if len(posts) != 1 || posts[0].Link != itm.Link || posts[0].Title != itm.Title {
		t.Errorf("posts = %+v, want the item's", posts)
	}
	if s := itemStatus(t, repo, itm.Id); s != ItemPublished {
		t.Errorf("item status %d, want %d (published)", s, ItemPublished)
	}
}

func TestPublishItemWithoutBroadcastQueuesNothing(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	if err := repo.AddFollower(testHandle, &FollowerInfo{
		UserUrl: "https://social.example/users/a", ApproveStatus: 1, UserInbox: "https://social.example/users/a/inbox",
	}); err != nil {
		t.Fatal(err)
	}
	itm := addDueItem(t, repo, acctId, "1")

	if published, err := repo.PublishItem(itm, testToot("1"), false); err != nil || !published {
		t.Fatalf("PublishItem = %v, %v; want true, nil", published, err)
	}
	if n := countRows(t, repo, "toot_deliveries"); n != 0 {
		t.Errorf("%d toots queued, want none", n)
	}
	if n := countRows(t, repo, "toots"); n != 1 {
		t.Errorf("%d toots, want 1", n)
	}
}

// Two publishers racing for the same item (the check loop and a new follow,
// or a retry after a crash) publish it once.
func TestPublishItemTwiceWritesOnce(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	itm := addDueItem(t, repo, acctId, "1")

	if published, err := repo.PublishItem(itm, testToot("1"), true); err != nil || !published {
		t.Fatalf("first PublishItem = %v, %v; want true, nil", published, err)
	}
	if published, err := repo.PublishItem(itm, testToot("2"), true); err != nil || published {
		t.Fatalf("second PublishItem = %v, %v; want false, nil", published, err)
	}
	if n := countRows(t, repo, "feed_posts"); n != 1 {
		t.Errorf("%d posts, want 1", n)
	}
	if n := countRows(t, repo, "toots"); n != 1 {
		t.Errorf("%d toots, want 1", n)
	}
}

// A failure halfway through leaves nothing behind, and the item due.
func TestPublishItemFailureWritesNothing(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	if err := repo.AddFollower(testHandle, &FollowerInfo{
		UserUrl: "https://social.example/users/a", ApproveStatus: 1, UserInbox: "https://social.example/users/a/inbox",
	}); err != nil {
		t.Fatal(err)
	}
	first := addDueItem(t, repo, acctId, "1")
	if published, err := repo.PublishItem(first, testToot("1"), true); err != nil || !published {
		t.Fatalf("PublishItem = %v, %v; want true, nil", published, err)
	}
	posts, toots, queued := countRows(t, repo, "feed_posts"), countRows(t, repo, "toots"), countRows(t, repo, "toot_deliveries")

	// The same status id again violates toots' unique index, after the item
	// was marked and its post stored.
	second := addDueItem(t, repo, acctId, "2")
	if published, err := repo.PublishItem(second, testToot("1"), true); err == nil || published {
		t.Fatalf("PublishItem = %v, %v; want false and an error", published, err)
	}
	if s := itemStatus(t, repo, second.Id); s != ItemDue {
		t.Errorf("item status %d, want %d (still due)", s, ItemDue)
	}
	if n := countRows(t, repo, "feed_posts"); n != posts {
		t.Errorf("%d posts, want %d", n, posts)
	}
	if n := countRows(t, repo, "toots"); n != toots {
		t.Errorf("%d toots, want %d", n, toots)
	}
	if n := countRows(t, repo, "toot_deliveries"); n != queued {
		t.Errorf("%d queued, want %d", n, queued)
	}
}

// publishToFollower publishes one item per guid, each tooted at its time and
// broadcast to one follower, so that each queues one delivery.
func publishToFollower(t *testing.T, repo *Repo, acctId int, tootedAt map[string]time.Time) {
	t.Helper()
	if err := repo.AddFollower(testHandle, &FollowerInfo{
		UserUrl: "https://social.example/users/a", ApproveStatus: 1, UserInbox: "https://social.example/users/a/inbox",
	}); err != nil {
		t.Fatal(err)
	}
	for guid, at := range tootedAt {
		toot := testToot(guid)
		toot.TootedAt = at
		if published, err := repo.PublishItem(addDueItem(t, repo, acctId, guid), toot, true); err != nil || !published {
			t.Fatalf("PublishItem = %v, %v; want true, nil", published, err)
		}
	}
}

// Purging a toot drops what was still to be delivered of it, and nothing else.
func TestPurgeDropsPendingDeliveries(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	now := time.Now().UTC()
	publishToFollower(t, repo, acctId, map[string]time.Time{"old": now.Add(-48 * time.Hour), "new": now})

	if err := repo.PurgePostsAndToots(acctId, now.Add(-24*time.Hour)); err != nil {
		t.Fatal(err)
	}
	queued, err := repo.GetTootQueueItems(0, 100)
	if err != nil {
		t.Fatal(err)
	}
	if len(queued) != 1 || queued[0].StatusId != testToot("new").StatusId {
		t.Errorf("queued %+v; want only the new toot", queued)
	}
}

// Deleting an account drops what was still to be delivered of its toots.
func TestDeleteAccountDropsPendingDeliveries(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	publishToFollower(t, repo, acctId, map[string]time.Time{"1": time.Now().UTC()})

	if err := repo.BruteDeleteAccount(acctId); err != nil {
		t.Fatal(err)
	}
	if n := countRows(t, repo, "toot_deliveries"); n != 0 {
		t.Errorf("%d deliveries left, want none", n)
	}
}

// A database at version 10 keeps its queue through migration 11, which
// replaces the copies of the toot by references to it.
func TestMigrationKeepsTheQueue(t *testing.T) {
	cfg := &shared.Config{
		DbFile: filepath.Join(t.TempDir(), "test.db"),
		Birb:   &shared.UserInfo{User: "birb"},
	}
	repo := NewRepo(cfg, shared.NewLogger(io.Discard, "Error")).(*Repo)
	repo.migrateTo(10)
	if _, err := repo.AddAccountIfNotExist(&Account{
		CreatedAt: time.Now(), Handle: testHandle, UserUrl: "https://kakapo.example.org/u/" + testHandle,
	}, ""); err != nil {
		t.Fatal(err)
	}
	acct, err := repo.GetAccount(testHandle)
	if err != nil {
		t.Fatal(err)
	}
	tootedAt := time.Date(2026, 10, 1, 12, 0, 0, 0, time.UTC)
	statusId := "https://kakapo.example.org/u/blog.example.org/status/1"
	if _, err := repo.db.Exec(`INSERT INTO toots (account_id, tooted_at, status_id, content)
		VALUES (?, ?, ?, 'toot one')`, acct.Id, tootedAt, statusId); err != nil {
		t.Fatal(err)
	}
	inboxes := []string{"https://b.example/inbox", "https://a.example/inbox"}
	for _, inbox := range inboxes {
		if _, err := repo.db.Exec(`INSERT INTO toot_queue (sending_user, to_inbox, tooted_at, status_id, content)
			VALUES (?, ?, ?, ?, 'toot one')`, testHandle, inbox, tootedAt, statusId); err != nil {
			t.Fatal(err)
		}
	}

	repo.InitUpdateDb()

	queued, err := repo.GetTootQueueItems(0, 100)
	if err != nil {
		t.Fatal(err)
	}
	if len(queued) != 2 {
		t.Fatalf("queued %+v; want 2", queued)
	}
	for i, q := range queued {
		// In the order they were queued.
		if q.ToInbox != inboxes[i] || q.SendingUser != testHandle || q.StatusId != statusId ||
			q.Content != "toot one" || !q.TootedAt.Equal(tootedAt) {
			t.Errorf("queued[%d] = %+v, want toot one to %s", i, q, inboxes[i])
		}
	}
	var gone int
	if err := repo.db.QueryRow(`SELECT COUNT(*) FROM sqlite_master WHERE name='toot_queue'`).Scan(&gone); err != nil ||
		gone != 0 {
		t.Errorf("toot_queue still exists (%d, %v)", gone, err)
	}
}

// Foreign keys are enforced: a toot cannot belong to an account that does not
// exist, on any connection of the pool.
func TestForeignKeysEnforced(t *testing.T) {
	repo, acctId := newPublishRepo(t)
	// Held open at once, so that each is a connection of its own.
	for range 3 {
		conn, err := repo.db.Conn(context.Background())
		if err != nil {
			t.Fatal(err)
		}
		defer conn.Close()
		var on int
		if err := conn.QueryRowContext(context.Background(), `PRAGMA foreign_keys`).Scan(&on); err != nil || on != 1 {
			t.Fatalf("foreign_keys = %d, %v; want 1", on, err)
		}
	}
	if _, err := repo.db.Exec(`INSERT INTO toots (account_id, tooted_at, status_id, content)
		VALUES (?, ?, 'https://kakapo.example.org/u/x/status/1', 'orphan')`, acctId+1, time.Now()); err == nil {
		t.Error("inserted a toot for an account that does not exist")
	}
}

// A database at version 9 keeps its rows through migration 10, which drops
// the hash columns.
func TestMigrationDropsTheItemHash(t *testing.T) {
	cfg := &shared.Config{
		DbFile: filepath.Join(t.TempDir(), "test.db"),
		Birb:   &shared.UserInfo{User: "birb"},
	}
	repo := NewRepo(cfg, shared.NewLogger(io.Discard, "Error")).(*Repo)
	repo.migrateTo(9)
	if _, err := repo.AddAccountIfNotExist(&Account{
		CreatedAt: time.Now(), Handle: testHandle, UserUrl: "https://kakapo.example.org/u/" + testHandle,
	}, ""); err != nil {
		t.Fatal(err)
	}
	acct, err := repo.GetAccount(testHandle)
	if err != nil {
		t.Fatal(err)
	}
	postTime := time.Date(2026, 10, 1, 12, 0, 0, 0, time.UTC)
	for _, q := range []string{
		`INSERT INTO feed_posts (account_id, post_guid_hash, post_time, link, title, description)
			VALUES (?1, 42, ?2, 'https://blog.example.org/1', 'One', 'About one')`,
		`INSERT INTO toots (account_id, post_guid_hash, tooted_at, status_id, content)
			VALUES (?1, 42, ?2, 'https://kakapo.example.org/u/blog.example.org/status/1', 'toot one')`,
		`INSERT INTO feed_items (account_id, guid, link_key, post_guid_hash, post_time, first_seen, status)
			VALUES (?1, 'g1', 'blog.example.org/1', 42, ?2, ?2, 1)`,
	} {
		if _, err := repo.db.Exec(q, acct.Id, postTime); err != nil {
			t.Fatal(err)
		}
	}

	repo.InitUpdateDb()

	var ver int
	if err := repo.db.QueryRow(`SELECT val FROM sys_params WHERE name='schema_ver'`).Scan(&ver); err != nil || ver != schemaVer {
		t.Fatalf("schema_ver = %d, %v; want %d", ver, err, schemaVer)
	}
	for _, table := range []string{"feed_posts", "toots", "feed_items"} {
		var n int
		if err := repo.db.QueryRow(`SELECT COUNT(*) FROM pragma_table_info(?) WHERE name='post_guid_hash'`,
			table).Scan(&n); err != nil || n != 0 {
			t.Errorf("%s still has post_guid_hash (%d, %v)", table, n, err)
		}
		if c := countRows(t, repo, table); c != 1 {
			t.Errorf("%s has %d rows, want 1", table, c)
		}
	}
	posts, err := repo.GetPostsPage(acct.Id, 0, 10)
	if err != nil || len(posts) != 1 || posts[0].Title != "One" || !posts[0].PostTime.Equal(postTime) {
		t.Errorf("GetPostsPage = %+v, %v; want the post", posts, err)
	}
	if toot, err := repo.GetToot("https://kakapo.example.org/u/blog.example.org/status/1"); err != nil ||
		toot == nil || toot.Content != "toot one" {
		t.Errorf("GetToot = %+v, %v; want the toot", toot, err)
	}
	if links, err := repo.GetFeedPostLinks(acct.Id); err != nil || !slices.Equal(links, []string{"https://blog.example.org/1"}) {
		t.Errorf("GetFeedPostLinks = %v, %v", links, err)
	}
	if byGuid, byLink, err := repo.FindSeenItem(acct.Id, "g1", "blog.example.org/1"); err != nil || !byGuid || !byLink {
		t.Errorf("FindSeenItem = %v, %v, %v; want the item", byGuid, byLink, err)
	}
	// The posts' new index serves the web page.
	var plan string
	if err := repo.db.QueryRow(`EXPLAIN QUERY PLAN SELECT post_time FROM feed_posts
		WHERE account_id=? ORDER BY post_time DESC`, acct.Id).Scan(new(int), new(int), new(int), &plan); err != nil {
		t.Fatal(err)
	}
	if !strings.Contains(plan, "idx_121") {
		t.Errorf("query plan %q, want it to use idx_121", plan)
	}
}