package dyzurbot

import (
	"fmt"
	"testing"
	"time"
)

func TestLoadConfigDefaults(t *testing.T) {
	t.Setenv("GOOGLE_SHEETS_ID", "sheet-123")
	t.Setenv("SHEET_RANGE", "")
	t.Setenv("ROTA_CACHE_PATH", "")
	t.Setenv("SYNC_INTERVAL", "")

	cfg, err := LoadConfig()
	if err != nil {
		t.Fatalf("LoadConfig: %v", err)
	}
	if cfg.SpreadsheetID != "sheet-123" {
		t.Errorf("SpreadsheetID: got %q", cfg.SpreadsheetID)
	}
	wantRange := fmt.Sprintf("%d!A1:F100", time.Now().Year())
	if cfg.SheetRange != wantRange {
		t.Errorf("SheetRange default: got %q, want %q", cfg.SheetRange, wantRange)
	}
	if cfg.CachePath != "rota.json" {
		t.Errorf("CachePath default: got %q", cfg.CachePath)
	}
	if cfg.SyncInterval != 30*time.Minute {
		t.Errorf("SyncInterval default: got %v", cfg.SyncInterval)
	}
}

func TestLoadConfigRequiresSpreadsheetID(t *testing.T) {
	t.Setenv("GOOGLE_SHEETS_ID", "")
	if _, err := LoadConfig(); err == nil {
		t.Fatal("expected error when GOOGLE_SHEETS_ID is missing")
	}
}

func TestLoadConfigRejectsBadInterval(t *testing.T) {
	t.Setenv("GOOGLE_SHEETS_ID", "sheet-123")
	t.Setenv("SYNC_INTERVAL", "not-a-duration")
	if _, err := LoadConfig(); err == nil {
		t.Fatal("expected error for unparseable SYNC_INTERVAL")
	}
}

func TestLoadConfigRejectsNonPositiveInterval(t *testing.T) {
	t.Setenv("GOOGLE_SHEETS_ID", "sheet-123")
	t.Setenv("SYNC_INTERVAL", "0s")
	if _, err := LoadConfig(); err == nil {
		t.Fatal("expected error for non-positive SYNC_INTERVAL")
	}
}