package sqlite

import (
	"context"
	"database/sql"
	"errors"
	"path/filepath"
	"testing"
)

func TestOpenClose(t *testing.T) {
	store := openTestDB(t)
	if store == nil {
		t.Fatal("Open() returned nil")
	}
}

func TestOpenInvalidDSN(t *testing.T) {
	_, err := Open(context.Background(), "file:/nonexistent/dir/test.db?_pragma=foreign_keys(0)")
	if err == nil {
		t.Fatal("Open() with invalid dsn error = nil, want error")
	}
}

func TestWithTxCommit(t *testing.T) {
	store := openTestDB(t)

	err := store.WithTx(context.Background(), func(q *Queries) error {
		_, err := q.Hosts.Create(context.Background(), Host{
			HostID: "tx-host", BaseURL: "https://tx.com", HostVersion: "1.0",
		})
		return err
	})
	if err != nil {
		t.Fatalf("WithTx() error = %v", err)
	}

	host, err := store.Hosts().GetByHostID(context.Background(), "tx-host")
	if err != nil {
		t.Fatalf("GetByHostID() after tx = %v", err)
	}
	if host.HostID != "tx-host" {
		t.Fatalf("host = %+v, want tx-host", host)
	}
}

func TestWithTxRollbackOnError(t *testing.T) {
	store := openTestDB(t)

	err := store.WithTx(context.Background(), func(q *Queries) error {
		q.Hosts.Create(context.Background(), Host{
			HostID: "rollback-host", BaseURL: "https://r.com", HostVersion: "1.0",
		})
		return errors.New("rollback")
	})
	if err == nil {
		t.Fatal("WithTx() error = nil, want rollback error")
	}

	_, err = store.Hosts().GetByHostID(context.Background(), "rollback-host")
	if !errors.Is(err, sql.ErrNoRows) {
		t.Fatalf("GetByHostID() after rollback error = %v, want sql.ErrNoRows", err)
	}
}

func TestTableExists(t *testing.T) {
	store := openTestDB(t)
	db := store.SQLDB()

	found, err := tableExists(context.Background(), db, "hosts")
	if err != nil {
		t.Fatalf("tableExists('hosts') error = %v", err)
	}
	if !found {
		t.Fatal("tableExists('hosts') = false, want true")
	}

	found, err = tableExists(context.Background(), db, "nonexistent")
	if err != nil {
		t.Fatalf("tableExists('nonexistent') error = %v", err)
	}
	if found {
		t.Fatal("tableExists('nonexistent') = true, want false")
	}
}

func TestDetectLegacy0001Schema(t *testing.T) {
	store := openTestDB(t)
	db := store.SQLDB()

	tx, err := db.BeginTx(context.Background(), nil)
	if err != nil {
		t.Fatalf("BeginTx error = %v", err)
	}
	defer tx.Rollback()

	// After migration all three host/packs/providers tables exist,
	// so detectLegacy0001Schema reports complete=true.
	complete, partial, err := detectLegacy0001Schema(context.Background(), tx)
	if err != nil {
		t.Fatalf("detectLegacy0001Schema() error = %v", err)
	}
	if !complete {
		t.Fatalf("detectLegacy0001Schema() = (complete=%v, partial=%v), want (true, false)", complete, partial)
	}
	if partial {
		t.Fatal("partial should be false when all 3 tables exist")
	}
}

func TestWithForeignKeysEnabled(t *testing.T) {
	if got := withForeignKeysEnabled("file:test.db"); got != "file:test.db?_pragma=foreign_keys(1)" {
		t.Fatalf("withForeignKeysEnabled no query = %q", got)
	}
	if got := withForeignKeysEnabled("file:test.db?a=1"); got != "file:test.db?a=1&_pragma=foreign_keys(1)" {
		t.Fatalf("withForeignKeysEnabled with query = %q", got)
	}
}

func TestSQLDB(t *testing.T) {
	store := openTestDB(t)
	db := store.SQLDB()
	if db == nil {
		t.Fatal("SQLDB() returned nil")
	}
	if err := db.PingContext(context.Background()); err != nil {
		t.Fatalf("Ping() error = %v", err)
	}
}

func TestMigrationFileNames(t *testing.T) {
	names, err := migrationFileNames()
	if err != nil {
		t.Fatalf("migrationFileNames() error = %v", err)
	}
	if len(names) == 0 {
		t.Fatal("migrationFileNames() returned empty")
	}
	for _, name := range names {
		if filepath.Ext(name) != ".sql" {
			t.Fatalf("migrationFileNames() entry %q not .sql file", name)
		}
	}
}

func TestReadMigration(t *testing.T) {
	content, err := readMigration("0001_init.sql")
	if err != nil {
		t.Fatalf("readMigration('0001_init.sql') error = %v", err)
	}
	if len(content) == 0 {
		t.Fatal("readMigration() returned empty content")
	}
}

func TestReadMigrationNotFound(t *testing.T) {
	_, err := readMigration("nonexistent.sql")
	if err == nil {
		t.Fatal("readMigration('nonexistent.sql') error = nil, want error")
	}
}