// enemy_config.cpp - Implementació del parser de EnemyConfig
// © 2026 JailDesigner

#include "game/entities/enemy_config.hpp"

#include <cstdint>
#include <exception>
#include <iostream>
#include <string>

namespace {

    auto parseColor(const fkyaml::node& node, SDL_Color& out) -> bool {
        if (!node.is_sequence() || node.size() != 3) {
            return false;
        }
        const auto R = node[0].get_value<uint32_t>();
        const auto G = node[1].get_value<uint32_t>();
        const auto B = node[2].get_value<uint32_t>();
        out = SDL_Color{
            .r = static_cast<uint8_t>(R),
            .g = static_cast<uint8_t>(G),
            .b = static_cast<uint8_t>(B),
            .a = 255};
        return true;
    }

    auto aiTypeFromString(const std::string& s) -> std::optional<EnemyType> {
        if (s == "pentagon") { return EnemyType::PENTAGON; }
        if (s == "square") { return EnemyType::SQUARE; }
        if (s == "pinwheel") { return EnemyType::PINWHEEL; }
        return std::nullopt;
    }

}  // namespace

auto EnemyConfig::fromYaml(const fkyaml::node& node, EnemyType expected_ai_type)
    -> std::optional<EnemyConfig> {
    try {
        EnemyConfig cfg;

        cfg.name = node.contains("name") ? node["name"].get_value<std::string>() : "enemy";

        // ai_type — validació estricta contra el tipus esperat
        if (!node.contains("ai_type")) {
            std::cerr << "[EnemyConfig] Error: falta 'ai_type' a " << cfg.name << '\n';
            return std::nullopt;
        }
        const auto AI_STR = node["ai_type"].get_value<std::string>();
        const auto PARSED = aiTypeFromString(AI_STR);
        if (!PARSED) {
            std::cerr << "[EnemyConfig] Error: ai_type desconegut '" << AI_STR << "' a " << cfg.name << '\n';
            return std::nullopt;
        }
        if (*PARSED != expected_ai_type) {
            std::cerr << "[EnemyConfig] Error: ai_type '" << AI_STR
                      << "' no coincideix amb el tipus esperat (per directori) a " << cfg.name << '\n';
            return std::nullopt;
        }
        cfg.ai_type = *PARSED;

        // shape
        if (!node.contains("shape") || !node["shape"].contains("path")) {
            std::cerr << "[EnemyConfig] Error: falta 'shape.path' a " << cfg.name << '\n';
            return std::nullopt;
        }
        cfg.shape.path = node["shape"]["path"].get_value<std::string>();

        // physics
        if (!node.contains("physics")) {
            std::cerr << "[EnemyConfig] Error: falta 'physics' a " << cfg.name << '\n';
            return std::nullopt;
        }
        const auto& physics = node["physics"];
        cfg.physics.mass = physics["mass"].get_value<float>();
        cfg.physics.speed = physics["speed"].get_value<float>();
        cfg.physics.rotation_delta_min = physics["rotation_delta_min"].get_value<float>();
        cfg.physics.rotation_delta_max = physics["rotation_delta_max"].get_value<float>();
        cfg.physics.collision_radius = physics["collision_radius"].get_value<float>();

        // behavior — tots els camps són opcionals; només l'AI corresponent els consumeix.
        if (node.contains("behavior")) {
            const auto& b = node["behavior"];
            if (b.contains("zigzag_prob_per_second")) {
                cfg.behavior.zigzag_prob_per_second = b["zigzag_prob_per_second"].get_value<float>();
            }
            if (b.contains("angle_change_max")) {
                cfg.behavior.angle_change_max = b["angle_change_max"].get_value<float>();
            }
            if (b.contains("tracking_strength")) {
                cfg.behavior.tracking_strength = b["tracking_strength"].get_value<float>();
            }
            if (b.contains("tracking_interval")) {
                cfg.behavior.tracking_interval = b["tracking_interval"].get_value<float>();
            }
            if (b.contains("rotation_proximity_multiplier")) {
                cfg.behavior.rotation_proximity_multiplier = b["rotation_proximity_multiplier"].get_value<float>();
            }
            if (b.contains("proximity_distance")) {
                cfg.behavior.proximity_distance = b["proximity_distance"].get_value<float>();
            }
        }

        // colors
        if (!node.contains("colors") ||
            !parseColor(node["colors"]["normal"], cfg.colors.normal) ||
            !parseColor(node["colors"]["wounded"], cfg.colors.wounded)) {
            std::cerr << "[EnemyConfig] Error: 'colors.normal' / 'colors.wounded' no són [r,g,b] a " << cfg.name << '\n';
            return std::nullopt;
        }

        // score
        if (!node.contains("score")) {
            std::cerr << "[EnemyConfig] Error: falta 'score' a " << cfg.name << '\n';
            return std::nullopt;
        }
        cfg.score = node["score"].get_value<int>();

        return cfg;
    } catch (const std::exception& e) {
        std::cerr << "[EnemyConfig] Excepció parsejant: " << e.what() << '\n';
        return std::nullopt;
    }
}