package html

import (
	"context"

	"github.com/MontFerret/ferret/pkg/drivers"
	"github.com/MontFerret/ferret/pkg/runtime/core"
	"github.com/MontFerret/ferret/pkg/runtime/values"
	"github.com/MontFerret/ferret/pkg/runtime/values/types"
)

// NAVIGATE_BACK navigates a given page back within its navigation history.
// The operation blocks the execution until the page gets loaded.
// If the history is empty, the function returns FALSE.
// @param {HTMLPage} page - Target page.
// @param {Int} [entry=1] - An integer value indicating how many pages to skip.
// @param {Int} [timeout=5000] - Navigation timeout.
// @return {Boolean} - True if history exists and the operation succeeded, otherwise false.
func NavigateBack(ctx context.Context, args ...core.Value) (core.Value, error) {
	err := core.ValidateArgs(args, 1, 3)

	if err != nil {
		return values.False, err
	}

	page, err := drivers.ToPage(args[0])

	if err != nil {
		return values.None, err
	}

	skip := values.NewInt(1)
	timeout := values.NewInt(drivers.DefaultWaitTimeout)

	if len(args) > 1 {
		err = core.ValidateType(args[1], types.Int)

		if err != nil {
			return values.None, err
		}

		skip = args[1].(values.Int)
	}

	if len(args) > 2 {
		err = core.ValidateType(args[2], types.Int)

		if err != nil {
			return values.None, err
		}

		timeout = args[2].(values.Int)
	}

	ctx, fn := waitTimeout(ctx, timeout)
	defer fn()

	return page.NavigateBack(ctx, skip)
}