package projectinstance

import (
	"errors"

	"chat-agent-system/internal/workflowdef"
)

var (
	ErrNotAvailable             = errors.New("project instance store not available")
	ErrProjectNotFound          = errors.New("project not found")
	ErrForbiddenNotCreator      = errors.New("forbidden: only project creator can configure workflow")
	ErrPlanFrozen               = errors.New("plan frozen: workflow already active")
	ErrWorkflowAlreadyActive    = errors.New("workflow already active for project")
	ErrPlanChangedReconfirm     = errors.New("plan changed: reconfirm required")
	ErrInvalidPlan              = errors.New("invalid workflow plan")
	ErrValidationFailed         = errors.New("workflow plan validation failed")
	ErrTokenInvalid             = errors.New("activation token invalid or expired")
	ErrConcurrentConflict       = errors.New("conflict: project version mismatch")
	ErrPlanRevisionConflict     = errors.New("conflict: plan revision mismatch")
	ErrWorkflowVersionNotFound  = errors.New("workflow version not found or not published")
	ErrLegacySwitchBlocked      = errors.New("legacy workflow switch blocked: use project settings activation")
	ErrInstanceNotFound         = errors.New("workflow instance not found")
	ErrStageGateNotReady        = errors.New("stage gate not ready: required documents not approved")
	ErrStageNotActive           = errors.New("stage is not the active stage")
	ErrInvalidStage             = errors.New("invalid stage key for instance")
	ErrInstanceRevisionConflict = errors.New("conflict: instance config revision mismatch")
	ErrEmptyWorkflow            = errors.New("empty workflow: at least one enabled document required to activate")
	ErrTerminationNotAllowed    = errors.New("termination not allowed for instance state")
)

// ValidationError 保留具体校验问题，供 HTTP 层返回可操作的错误信息。
type ValidationError struct {
	Issues []workflowdef.ValidationIssue
}

func (e *ValidationError) Error() string {
	return ErrValidationFailed.Error()
}

func (e *ValidationError) Unwrap() error {
	return ErrValidationFailed
}

func newValidationError(result workflowdef.ValidationResult) error {
	return &ValidationError{Issues: result.Issues}
}