package manifest

import (
	"database/sql"
	"fmt"
	"os"
	"strings"
	"testing"

	_ "modernc.org/sqlite"
)

func TestSetJSONLSaveHook(t *testing.T) {
	old := SetJSONLSaveHook(func() error { return fmt.Errorf("hook error") })
	if old != nil {
		t.Error("expected nil old hook")
	}
	restore := SetJSONLSaveHook(old)
	if restore == nil {
		t.Error("expected non-nil restore function")
	}
}

func TestJSONLSaveHookError(t *testing.T) {
	dir := t.TempDir()
	m := LoadJSONL(dir)
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	old := SetJSONLSaveHook(func() error { return fmt.Errorf("hook error") })
	defer SetJSONLSaveHook(old)
	if err := m.Save(); err == nil {
		t.Error("expected hook error from Save")
	}
	m.Close()
}

func TestJSONLSyncFuncError(t *testing.T) {
	dir := t.TempDir()
	m := LoadJSONL(dir)
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.syncFunc = func() error { return fmt.Errorf("sync func error") }
	if err := m.Save(); err == nil {
		t.Error("expected syncFunc error from Save")
	}
	m.Close()
}

func TestSQLiteOpenAppendSQLError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	m.open = func(driverName, dataSourceName string) (*sql.DB, error) {
		return nil, fmt.Errorf("simulated open error")
	}
	if err := m.OpenAppend(); err == nil {
		t.Error("expected error from sql.Open failure")
	}
}

func TestSQLiteOpenAppendCreateTableError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	realOpen := m.open
	m.open = func(driverName, dataSourceName string) (*sql.DB, error) {
		db, err := realOpen(driverName, dataSourceName)
		if err != nil {
			return nil, err
		}
		db.Close()
		return db, nil
	}
	if err := m.OpenAppend(); err == nil {
		t.Error("expected error from closed DB CREATE TABLE")
	}
}

func TestSQLiteHasAfterClose(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.Close()
	if m.Has("x1") {
		t.Error("Has should return false after Close")
	}
}

func TestSQLiteEntriesAfterClose(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.Close()
	entries := m.Entries()
	if entries != nil {
		t.Errorf("Entries should return nil after Close, got %d entries", len(entries))
	}
}

func TestSQLiteOpenAppendMkdirAllError(t *testing.T) {
	m, err := LoadSQLite("/proc/cannot-write")
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err == nil {
		t.Error("expected error creating dir under /proc")
		m.Close()
	}
}

func TestSQLiteOpenAppendNilOpener(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	m.open = nil
	if err := m.OpenAppend(); err != nil {
		t.Errorf("expected nil opener to use sql.Open fallback, got err: %v", err)
	}
	m.Close()
}

func TestSQLiteOpenAppendCreateIndexError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	realOpen := m.open
	m.open = func(driverName, dataSourceName string) (*sql.DB, error) {
		db, err := realOpen(driverName, dataSourceName)
		if err != nil {
			return nil, err
		}
		db.Close()
		return db, nil
	}
	if err := m.OpenAppend(); err == nil {
		t.Error("expected error from closed DB")
	}
}

func TestSQLiteHasQueryError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	closedDB := m.db
	closedDB.Close()
	result := m.Has("x1")
	if result {
		t.Error("Has should return false with broken DB connection")
	}
}

func TestSQLiteEntriesQueryError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	closedDB := m.db
	closedDB.Close()
	entries := m.Entries()
	if entries == nil {
		t.Error("Entries should return non-nil map with broken DB connection")
	}
	if len(entries) != 0 {
		t.Errorf("Entries should be empty with broken DB connection, got %d", len(entries))
	}
}

func TestSQLiteHasQueryErrorWithOpenDB(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	closedDB := m.db
	closedDB.Close()
	if m.Has("x1") {
		t.Error("Has should return false with closed DB")
	}
}

func TestSQLiteEntriesQueryErrorWithOpenDB(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	closedDB := m.db
	closedDB.Close()
	entries := m.Entries()
	if entries != nil && len(entries) != 0 {
		t.Errorf("Entries should be empty with closed DB, got %d", len(entries))
	}
}

func TestSQLiteCreateIndexError(t *testing.T) {
	dir := t.TempDir()
	m, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	realOpen := m.open
	callCount := 0
	m.open = func(driverName, dataSourceName string) (*sql.DB, error) {
		db, err := realOpen(driverName, dataSourceName)
		if err != nil {
			return nil, err
		}
		m.execFunc = func(query string, args ...any) (sql.Result, error) {
			callCount++
			if callCount == 2 {
				return nil, fmt.Errorf("injected CREATE INDEX error")
			}
			return db.Exec(query, args...)
		}
		return db, nil
	}
	if err := m.OpenAppend(); err == nil {
		t.Error("expected error from CREATE INDEX")
		m.Close()
	}
}

func TestConvertFromJSONLOpenAppendSQLError(t *testing.T) {
	dir := t.TempDir()
	m := LoadJSONL(dir)
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.Close()
	oldOpen := sqliteOpenFunc
	sqliteOpenFunc = func(driverName, dataSourceName string) (*sql.DB, error) {
		return nil, fmt.Errorf("simulated sqlite open error")
	}
	defer func() { sqliteOpenFunc = oldOpen }()
	_, err := ConvertFromJSONL(dir)
	if err == nil {
		t.Error("expected error from dst.OpenAppend during ConvertFromJSONL")
	}
}

func TestConvertFromJSONLDstOpenAppendError(t *testing.T) {
	dir := t.TempDir()
	m := LoadJSONL(dir)
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.Close()
	realOpen := defaultSQLOpener()
	oldOpen := sqliteOpenFunc
	sqliteOpenFunc = func(driverName, dataSourceName string) (*sql.DB, error) {
		db, err := realOpen(driverName, dataSourceName)
		if err != nil {
			return nil, err
		}
		db.Close()
		return db, nil
	}
	defer func() { sqliteOpenFunc = oldOpen }()
	_, err := ConvertFromJSONL(dir)
	if err == nil {
		t.Error("expected error from dst.OpenAppend during ConvertFromJSONL")
	}
}

func TestConvertFromSQLiteSrcOpenAppendError(t *testing.T) {
	dir := t.TempDir()
	src, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := src.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	src.Add("x1", "photo.jpg", 1024, "local")
	src.Close()
	realOpen := defaultSQLOpener()
	callCount := 0
	oldOpen := sqliteOpenFunc
	sqliteOpenFunc = func(driverName, dataSourceName string) (*sql.DB, error) {
		callCount++
		db, err := realOpen(driverName, dataSourceName)
		if err != nil {
			return nil, err
		}
		if callCount > 0 {
			db.Close()
		}
		return db, nil
	}
	defer func() { sqliteOpenFunc = oldOpen }()
	_, err = ConvertFromSQLite(dir)
	if err == nil {
		t.Error("expected error from src.OpenAppend during ConvertFromSQLite")
	}
}

func TestConvertFromSQLiteDstOpenAppendError(t *testing.T) {
	dir := t.TempDir()
	src, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := src.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	src.Add("x1", "photo.jpg", 1024, "local")
	src.Close()
	jsonlPath := JSONLPath(dir)
	f, err := os.Create(jsonlPath)
	if err != nil {
		t.Fatal(err)
	}
	f.Close()
	os.Chmod(jsonlPath, 0444)
	defer os.Chmod(jsonlPath, 0644)
	_, err = ConvertFromSQLite(dir)
	if err == nil {
		t.Error("expected error from dst.OpenAppend during ConvertFromSQLite")
	}
}

func TestJSONLSaveError(t *testing.T) {
	dir := t.TempDir()
	m := LoadJSONL(dir)
	if err := m.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	m.Add("x1", "photo.jpg", 1024, "local")
	m.file.Close()
	if err := m.Save(); err == nil {
		t.Error("expected Sync error on closed file")
	}
	m.Close()
}

func TestConvertFromSQLiteSaveError(t *testing.T) {
	dir := t.TempDir()
	src, err := LoadSQLite(dir)
	if err != nil {
		t.Fatal(err)
	}
	if err := src.OpenAppend(); err != nil {
		t.Fatal(err)
	}
	src.Add("x1", "photo.jpg", 1024, "local")
	src.Close()
	oldHook := jsonlSaveHook
	jsonlSaveHook = func() error { return fmt.Errorf("simulated sync error") }
	defer func() { jsonlSaveHook = oldHook }()
	_, err = ConvertFromSQLite(dir)
	if err == nil {
		t.Error("expected error from dst.Save during ConvertFromSQLite")
	}
	if err != nil && !strings.Contains(err.Error(), "save jsonl") {
		t.Errorf("expected save jsonl error, got: %v", err)
	}
}