#include <set>
#include "comdel_validator.h"
#include "library.h"

namespace domain {

    std::vector<ValidationError> ComdelValidator::validateSchema(Schema &schema, ValidationContext context) {
        std::vector<ValidationError> errors;

        context.instance = nullptr;
        context.attribute = nullptr;

        for (auto &instance: schema.componentInstances) {
            auto result = validateComponent(instance.get(), context);
            errors.insert(errors.end(), result.begin(), result.end());
        }
        return errors;
    }

    std::vector<ValidationError>
    ComdelValidator::validateInstanceCount(Schema &schema, Library &library, ValidationContext context) {
        std::vector<ValidationError> errors;

        // validate instance count
        std::map<std::string, int> instanceMap;
        for (auto &inst: schema.componentInstances) {
            instanceMap[inst->component.getName()]++;
        }

        for (auto comp: library.getComponents()) {
            int count = instanceMap[comp.getName()];

            context.attributes["componentName"] = Value::fromString(comp.getName());
            context.attributes["min"] = Value::fromInt(comp.getCount().first);
            context.attributes["max"] = Value::fromInt(comp.getCount().second);
            context.attributes["count"] = Value::fromInt(count);

            if (count < comp.getCount().first) {
                auto message = populateMessage(
                        "Not enough instances of component '{componentName}' required at least {min}, found {count}",
                        context);
                errors.emplace_back(Action::ERROR, message);
            } else if (count > comp.getCount().second) {
                auto message = populateMessage(
                        "To many instances of component '{componentName}' allow at most {max}, found {count}", context);
                errors.emplace_back(Action::ERROR, message);
            }
        }


        // validate bus instance count
        std::map<std::string, int> busInstanceMap;
        for (auto &inst: schema.busInstances) {
            busInstanceMap[inst->bus.getName()]++;
        }

        for (auto bus: library.getBuses()) {
            int count = busInstanceMap[bus.getName()];

            context.attributes["busName"] = Value::fromString(bus.getName());
            context.attributes["min"] = Value::fromInt(bus.getCount().first);
            context.attributes["max"] = Value::fromInt(bus.getCount().second);
            context.attributes["count"] = Value::fromInt(count);

            if (count < bus.getCount().first) {
                auto message = populateMessage(
                        "Not enough instances of bus '{busName}' required at least {min}, found {count}", context);
                errors.emplace_back(Action::ERROR, message);
            } else if (count > bus.getCount().second) {
                auto message = populateMessage(
                        "To many instances of bus '{busName}' allow at most {max}, found {count}", context);
                errors.emplace_back(Action::ERROR, message);
            }
        }

        return errors;
    }

    std::vector<ValidationError>
    ComdelValidator::validatePinConnections(Schema &schema, Library &library, ValidationContext context) {
        std::vector<ValidationError> errors;

        for (auto &inst: schema.componentInstances) {
            for (auto &pin: inst->component.getPins()) {
                if (pin.getConnection().getType() == PinConnection::REQUIRED) {
                    if (!connectionExists(schema, inst, pin)) {
                        context.instance = inst.get();
                        context.attributes["instanceName"] = Value::fromString(inst->name);
                        auto message = populateMessage(pin.getConnection().getMessage(), context);
                        errors.emplace_back(Action::ERROR, message);
                    }
                }
            }
        }

        return errors;
    }

    std::vector<ValidationError>
    ComdelValidator::validateComponent(ComponentInstance *instance, ValidationContext context) {
        std::vector<ValidationError> errors;

        context.instance = instance;
        context.attributes.clear();

        for (auto &attribute: instance->attributes) {
            context.attributes[attribute.name] = attribute.value;
        }

        for (auto &rule: instance->component.getRules()) {
            auto result = validateRule(rule, context);
            if (result) {
                errors.push_back(*result);
            }
        }

        for (auto &attribute: instance->attributes) {
            auto result = validateAttribute(&attribute, context);
            errors.insert(errors.end(), result.begin(), result.end());
        }

        return errors;
    }

    std::vector<ValidationError>
    ComdelValidator::validateAttribute(InstanceAttribute *attribute, ValidationContext context) {
        std::vector<ValidationError> errors;
        if (attribute->attribute.getPopup()) {
            Popup popup = *attribute->attribute.getPopup();
            context.attribute = attribute;
            context.attributes = std::map<std::string, Value>{{attribute->name, attribute->value}};

            for (auto &rule: popup.getRules()) {
                auto result = validateRule(rule, context);
                if (result) {
                    errors.push_back(*result);
                }
            }
        }
        return errors;
    }

    std::optional<ValidationError> ComdelValidator::validateRule(Rule rule, ValidationContext context) {
        RuleContext ruleContext;
        ruleContext.addressSpaces = context.addressSpaces;
        ruleContext.attributes = context.attributes;
        ruleContext.function = validators;
        auto action = rule.evaluate(ruleContext);
        if (action) {
            std::string message = this->populateMessage(action->getMessage(), context);
            return ValidationError{context.instance, context.attribute, action->getType(), message};
        }
        return nullopt;
    }

    std::vector<ValidationError>
    ComdelValidator::validateInstanceNames(Schema &schema, Library &library, ValidationContext context) {
        std::set<std::string> names;
        std::vector<ValidationError> errors;

        for(auto& component: schema.componentInstances) {
            if(names.find(component->name) != names.end()) {
                context.attributes["componentName"] = Value::fromString(component->name);
                auto message = populateMessage(
                        "There are multiple component instances named '{componentName}'", context);
                errors.emplace_back(Action::ERROR, message);
            }
            names.insert(component->name);
        }
        return errors;
    }


    std::string ComdelValidator::populateMessage(string source, ValidationContext context) {
        for (auto &[key, value]: context.attributes) {
            source = replacePlaceholder(source, key, value);
        }
        return source;
    }

    string ComdelValidator::replacePlaceholder(string source, string key, Value value) {
        key = "{" + key + "}";
        auto placeholderValue = value.string();

        auto found = source.find(key);
        while (found != string::npos) {
            source.replace(found, key.length(), placeholderValue);
            found = source.find(key);
        }
        return source;
    }

    bool ComdelValidator::connectionExists(Schema &schema, shared_ptr<ComponentInstance> &component, Pin &pin) {
        for (auto conn: schema.connections) {
            auto busConnection = dynamic_cast<BusConnectionInstance *>(conn.get());
            if (busConnection != nullptr) {
                if (busConnection->instance->name == component->name &&
                    busConnection->connection.getComponent().pin == pin.getName()) {
                    return true;
                }
            }

            auto directConnection = dynamic_cast<DirectConnectionInstance *>(conn.get());
            if (directConnection != nullptr) {
                if (directConnection->instance->name == component->name &&
                    busConnection->connection.getComponent().pin == pin.getName()) {
                    return true;
                }
                if (directConnection->secondInstance->name == component->name &&
                    busConnection->connection.getSecondComponent()->pin == pin.getName()) {
                    return true;
                }
            }
        }
        return false;
    }

    ComdelValidator::ComdelValidator(std::vector<FunctionValidator *> validators) {
        for (auto *validator: validators) {
            validator->clear();
            this->validators.insert(std::make_pair(validator->getName(), validator));
        }
    }
}