package store

import (
	"context"
	"path/filepath"
	"testing"
	"time"
)

func TestOpenCreatesSchema(t *testing.T) {
	ctx := context.Background()
	path := filepath.Join(t.TempDir(), "nested", "email_agent.db")

	s, err := Open(ctx, path)
	if err != nil {
		t.Fatalf("Open() error = %v", err)
	}
	defer s.Close()

	v, err := s.SchemaVersion(ctx)
	if err != nil {
		t.Fatalf("SchemaVersion() error = %v", err)
	}
	if v < 1 {
		t.Fatalf("SchemaVersion() = %d, want >= 1", v)
	}

	wantTables := []string{
		"messages", "classifications", "rules", "actions_log",
		"unsubscribe", "drafts", "summaries",
	}
	for _, table := range wantTables {
		var name string
		err := s.DB().QueryRowContext(ctx,
			`SELECT name FROM sqlite_master WHERE type='table' AND name=?`, table).Scan(&name)
		if err != nil {
			t.Errorf("table %q missing: %v", table, err)
		}
	}
}

func TestOpenIsIdempotent(t *testing.T) {
	ctx := context.Background()
	path := filepath.Join(t.TempDir(), "email_agent.db")

	s1, err := Open(ctx, path)
	if err != nil {
		t.Fatalf("first Open() error = %v", err)
	}
	_ = s1.Close()

	s2, err := Open(ctx, path)
	if err != nil {
		t.Fatalf("second Open() error = %v", err)
	}
	defer s2.Close()

	if err := s2.Ping(ctx); err != nil {
		t.Fatalf("Ping() error = %v", err)
	}
}

func TestMessagesInsertAndRead(t *testing.T) {
	ctx := context.Background()
	s, err := Open(ctx, filepath.Join(t.TempDir(), "email_agent.db"))
	if err != nil {
		t.Fatalf("Open() error = %v", err)
	}
	defer s.Close()

	_, err = s.DB().ExecContext(ctx,
		`INSERT INTO messages (gmail_id, subject, source_address) VALUES (?, ?, ?)`,
		"abc123", "Hello", "hello@where-woof.com")
	if err != nil {
		t.Fatalf("insert message: %v", err)
	}

	var subject string
	if err := s.DB().QueryRowContext(ctx,
		`SELECT subject FROM messages WHERE gmail_id = ?`, "abc123").Scan(&subject); err != nil {
		t.Fatalf("select message: %v", err)
	}
	if subject != "Hello" {
		t.Errorf("subject = %q, want %q", subject, "Hello")
	}
}

func TestUpsertAndListMessages(t *testing.T) {
	ctx := context.Background()
	s, err := Open(ctx, filepath.Join(t.TempDir(), "email_agent.db"))
	if err != nil {
		t.Fatalf("Open() error = %v", err)
	}
	defer s.Close()

	m := &Message{
		GmailID:         "1234000000000000000",
		ThreadID:        "999",
		FromAddr:        "favrolfe@gmail.com",
		ToAddr:          "Hello@where-woof.com",
		Subject:         "A forwarded hello",
		BodyText:        "body text",
		SourceAddress:   "Hello@where-woof.com",
		DateSent:        time.Date(2026, 10, 1, 9, 30, 0, 0, time.UTC),
		IMAPUID:         42,
		IMAPUIDValidity: 7,
	}
	id, err := s.UpsertMessage(ctx, m)
	if err != nil {
		t.Fatalf("UpsertMessage() error = %v", err)
	}
	if id == 0 {
		t.Fatal("UpsertMessage() returned id 0")
	}

	// A second upsert with the same Gmail id must update, not duplicate, and
	// must not move received_at.
	m.Subject = "Updated subject"
	id2, err := s.UpsertMessage(ctx, m)
	if err != nil {
		t.Fatalf("second UpsertMessage() error = %v", err)
	}
	if id2 != id {
		t.Errorf("second upsert id = %d, want %d", id2, id)
	}

	n, err := s.CountMessages(ctx)
	if err != nil {
		t.Fatalf("CountMessages() error = %v", err)
	}
	if n != 1 {
		t.Fatalf("CountMessages() = %d, want 1", n)
	}

	list, err := s.ListMessages(ctx, 10)
	if err != nil {
		t.Fatalf("ListMessages() error = %v", err)
	}
	if len(list) != 1 {
		t.Fatalf("ListMessages() len = %d, want 1", len(list))
	}
	got := list[0]
	if got.Subject != "Updated subject" {
		t.Errorf("Subject = %q, want updated value", got.Subject)
	}
	if got.SourceAddress != "Hello@where-woof.com" {
		t.Errorf("SourceAddress = %q", got.SourceAddress)
	}
	if got.IMAPUID != 42 || got.IMAPUIDValidity != 7 {
		t.Errorf("IMAP bookkeeping = (%d, %d), want (42, 7)", got.IMAPUID, got.IMAPUIDValidity)
	}
	if got.HasClassification {
		t.Error("HasClassification = true with no classifications row")
	}
}

func TestMigrationAddsIMAPColumns(t *testing.T) {
	ctx := context.Background()
	s, err := Open(ctx, filepath.Join(t.TempDir(), "email_agent.db"))
	if err != nil {
		t.Fatalf("Open() error = %v", err)
	}
	defer s.Close()

	v, err := s.SchemaVersion(ctx)
	if err != nil {
		t.Fatalf("SchemaVersion() error = %v", err)
	}
	if v < 2 {
		t.Errorf("SchemaVersion() = %d, want >= 2", v)
	}

	for _, col := range []string{"imap_uid", "imap_uidvalidity"} {
		var found bool
		rows, err := s.DB().QueryContext(ctx, `SELECT name FROM pragma_table_info('messages')`)
		if err != nil {
			t.Fatalf("pragma_table_info: %v", err)
		}
		for rows.Next() {
			var name string
			if err := rows.Scan(&name); err != nil {
				t.Fatalf("scan: %v", err)
			}
			if name == col {
				found = true
			}
		}
		_ = rows.Close()
		if !found {
			t.Errorf("column %q missing after migration", col)
		}
	}
}