package ckconfig

import (
	"errors"
	"fmt"

	commandkit "gitea.maximumdirect.net/eric/CommandKit"
)

func runConfigDiff[I, S any](invocation commandkit.Invocation, plan *configOperationPlan[I, S], state S) commandkit.Outcome {
	if plan.comparison == nil || plan.comparison.scope == nil {
		return configOperationFailure(errors.New("configuration comparison was not prepared"), nil, false)
	}
	selected := plan.comparison
	if err := invocation.Context.Err(); err != nil {
		return configOperationFailure(err, nil, false)
	}
	compare := selected.scope.scope.Compare
	if compare == nil {
		return configOperationFailure(fmt.Errorf("configuration scope %q has no comparison callback", selected.scope.scope.Name), nil, false)
	}
	acquired, err := compare(invocation.Context, selected.request, state)
	diagnostics := append([]commandkit.Diagnostic(nil), acquired.Diagnostics...)
	if err != nil {
		return configOperationFailure(err, diagnostics, false)
	}
	if err := invocation.Context.Err(); err != nil {
		return configOperationFailure(err, diagnostics, false)
	}
	report, err := renderDiffReport(acquired.Value)
	if err != nil {
		return configOperationFailure(err, diagnostics, false)
	}
	if err := invocation.Context.Err(); err != nil {
		return configOperationFailure(err, diagnostics, false)
	}
	if err := writeConfigReport(invocation.Streams.Out, report); err != nil {
		return configDeliveryFailure(err, diagnostics, true)
	}
	outcome := commandkit.Success()
	outcome.Diagnostics = diagnostics
	return outcome
}