package sheets

import (
	"context"
	"fmt"
)

// Fake is an in-memory replacement for Client used in tests.
// Values maps a "<spreadsheetID>/<a1Range>" key to pre-seeded rows.
type Fake struct {
	// Values maps "spreadsheetID/range" → rows returned by GetValues.
	Values map[string][][]any
	// Appended collects rows passed to AppendValues for assertion.
	Appended []AppendCall
	// BatchUpdated collects calls to BatchUpdateValues.
	BatchUpdated []BatchCall
}

// AppendCall records one AppendValues invocation.
type AppendCall struct {
	SpreadsheetID string
	Range         string
	Rows          [][]any
}

// BatchCall records one BatchUpdateValues invocation.
type BatchCall struct {
	SpreadsheetID string
	Updates       []ValueRange
}

func (f *Fake) GetValues(_ context.Context, spreadsheetID, a1Range string) ([][]any, error) {
	key := spreadsheetID + "/" + a1Range
	rows, ok := f.Values[key]
	if !ok {
		return nil, fmt.Errorf("sheets fake: no seed for %q", key)
	}
	return rows, nil
}

func (f *Fake) AppendValues(_ context.Context, spreadsheetID, a1Range string, rows [][]any) error {
	f.Appended = append(f.Appended, AppendCall{SpreadsheetID: spreadsheetID, Range: a1Range, Rows: rows})
	return nil
}

func (f *Fake) BatchUpdateValues(_ context.Context, spreadsheetID string, updates []ValueRange) error {
	f.BatchUpdated = append(f.BatchUpdated, BatchCall{SpreadsheetID: spreadsheetID, Updates: updates})
	return nil
}

func (f *Fake) WriteHeader(_ context.Context, _ string, _ []string) error { return nil }

func (f *Fake) SortByDateColumn(_ context.Context, _ string) error { return nil }