package net.fretux.skillengine.api;

import net.fretux.skillengine.SkillEngine;
import net.fretux.skillengine.capability.PlayerSkillData;
import net.fretux.skillengine.capability.SkillEngineCapabilities;
import net.fretux.skillengine.client.ClientSkillEngineBridge;
import net.fretux.skillengine.events.SkillPointsChangedEvent;
import net.fretux.skillengine.skilltree.AbilityNode;
import net.fretux.skillengine.skilltree.AbilityNodeRegistry;
import net.fretux.skillengine.skilltree.SkillLogic;
import net.fretux.skillengine.skilltree.SkillNode;
import net.fretux.skillengine.skilltree.SkillNodeRegistry;
import net.minecraft.resources.ResourceLocation;
import net.minecraft.world.entity.player.Player;
import net.minecraftforge.api.distmarker.Dist;
import net.minecraftforge.common.MinecraftForge;
import net.minecraftforge.fml.DistExecutor;
import net.minecraftforge.fml.loading.FMLEnvironment;

import java.util.List;
import java.util.Set;

public final class SkillEngineAPI {

    private SkillEngineAPI() {}

    public static ResourceLocation id(String path) {
        return ResourceLocation.fromNamespaceAndPath(SkillEngine.MODID, path);
    }

    public static ResourceLocation rl(String namespace, String path) {
        return ResourceLocation.fromNamespaceAndPath(namespace, path);
    }

    public static SkillNode getSkillNode(ResourceLocation id) {
        return SkillNodeRegistry.get(id);
    }

    public static AbilityNode getAbilityNode(ResourceLocation id) {
        return AbilityNodeRegistry.get(id);
    }

    public static boolean hasSkillNode(ResourceLocation id) {
        return SkillNodeRegistry.get(id) != null;
    }

    public static boolean hasAbilityNode(ResourceLocation id) {
        return AbilityNodeRegistry.get(id) != null;
    }

    public static List<SkillNode> getAllSkillNodes() {
        return List.copyOf(SkillNodeRegistry.all());
    }

    public static List<AbilityNode> getAllAbilityNodes() {
        return List.copyOf(AbilityNodeRegistry.all());
    }

    public static PlayerSkillData getPlayerData(Player player) {
        return player.getCapability(SkillEngineCapabilities.PLAYER_SKILLS).orElse(null);
    }

    public static int getSkillPoints(Player player) {
        PlayerSkillData data = getPlayerData(player);
        return data != null ? data.getSkillPoints() : 0;
    }

    public static void addSkillPoints(Player player, int amount) {
        PlayerSkillData data = getPlayerData(player);
        if (data != null) {
            data.addSkillPoints(amount);
            if (amount != 0) {
                MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                        player,
                        Math.abs(amount),
                        amount > 0 ? SkillPointsChangedEvent.Reason.GAINED : SkillPointsChangedEvent.Reason.SPENT,
                        null
                ));
            }
        }
    }

    public static boolean consumeSkillPoints(Player player, int amount) {
        if (amount <= 0) return false;
        PlayerSkillData data = getPlayerData(player);
        if (data != null && data.getSkillPoints() >= amount) {
            data.addSkillPoints(-amount);
            MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                    player,
                    amount,
                    SkillPointsChangedEvent.Reason.SPENT,
                    null
            ));
            return true;
        }
        return false;
    }
    
    public static Set<ResourceLocation> getUnlockedSkillNodes(Player player) {
        PlayerSkillData data = getPlayerData(player);
        return data != null ? data.getUnlockedNodes() : Set.of();
    }

    public static boolean isSkillUnlocked(Player player, ResourceLocation id) {
        PlayerSkillData data = getPlayerData(player);
        return data != null && data.isUnlocked(id);
    }

    public static boolean unlockSkill(Player player, ResourceLocation id) {
        PlayerSkillData data = getPlayerData(player);
        if (data == null) return false;
        SkillNode node = SkillNodeRegistry.get(id);
        if (node == null) return false;
        List<SkillNode> unlockPlan = SkillLogic.getUnlockPlan(data, player, node).orElse(null);
        if (unlockPlan == null) return false;
        for (SkillNode plannedNode : unlockPlan) {
            data.unlockNode(plannedNode);
            if (plannedNode.getCost() > 0) {
                MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                        player,
                        plannedNode.getCost(),
                        SkillPointsChangedEvent.Reason.SPENT,
                        plannedNode.getId()
                ));
            }
        }
        return true;
    }

    public static boolean refundSkill(Player player, ResourceLocation id) {
        PlayerSkillData data = getPlayerData(player);
        SkillNode node = SkillNodeRegistry.get(id);
        if (data == null || node == null || !data.refundNode(id)) return false;
        MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                player,
                node.getCost(),
                SkillPointsChangedEvent.Reason.REFUNDED,
                id
        ));
        return true;
    }

    public static int refundBranch(Player player, ResourceLocation rootId) {
        PlayerSkillData data = getPlayerData(player);
        if (data == null) return 0;
        int refunded = data.refundBranch(rootId);
        if (refunded > 0) {
            MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                    player,
                    refunded,
                    SkillPointsChangedEvent.Reason.REFUNDED,
                    rootId
            ));
        }
        return refunded;
    }

    public static int resetSkills(Player player) {
        PlayerSkillData data = getPlayerData(player);
        if (data == null) return 0;
        int refunded = data.resetAllNodesPreserveEarnedPoints();
        if (refunded > 0) {
            MinecraftForge.EVENT_BUS.post(new SkillPointsChangedEvent(
                    player,
                    refunded,
                    SkillPointsChangedEvent.Reason.REFUNDED,
                    null
            ));
        }
        return refunded;
    }

    public static boolean isAbilityUnlocked(Player player, ResourceLocation id) {
        PlayerSkillData data = getPlayerData(player);
        return data != null && data.isAbilityUnlocked(id);
    }

    public static Set<ResourceLocation> getUnlockedAbilities(Player player) {
        PlayerSkillData data = getPlayerData(player);
        return data != null ? data.getUnlockedAbilities() : Set.of();
    }

    public static boolean unlockAbility(Player player, ResourceLocation id) {
        PlayerSkillData data = getPlayerData(player);
        if (data == null) return false;
        AbilityNode ability = AbilityNodeRegistry.get(id);
        if (ability == null) return false;
        data.unlockAbility(ability);
        return true;
    }

    public static void bindAbility(Player player, int slot, ResourceLocation abilityId) {
        PlayerSkillData data = getPlayerData(player);
        if (data == null) return;
        data.bindAbility(slot, abilityId);
    }

    public static ResourceLocation getAbilityInSlot(Player player, int slot) {
        PlayerSkillData data = getPlayerData(player);
        return data != null ? data.getAbilityInSlot(slot) : null;
    }

    public static ResourceLocation[] getAbilitySlots(Player player) {
        PlayerSkillData data = getPlayerData(player);
        return data != null ? data.getAbilitySlots() : new ResourceLocation[3];
    }

    public static boolean clientHasSkill(ResourceLocation id) {
        if (FMLEnvironment.dist != Dist.CLIENT) {
            return false;
        }
        return DistExecutor.unsafeCallWhenOn(Dist.CLIENT, () -> () -> ClientSkillEngineBridge.clientHasSkill(id));
    }

    public static int clientGetAbilitySlot(ResourceLocation id) {
        if (FMLEnvironment.dist != Dist.CLIENT) {
            return -1;
        }
        return DistExecutor.unsafeCallWhenOn(Dist.CLIENT, () -> () -> ClientSkillEngineBridge.clientGetAbilitySlot(id));
    }

    public static ResourceLocation[] clientGetAbilitySlots() {
        if (FMLEnvironment.dist != Dist.CLIENT) {
            return new ResourceLocation[3];
        }
        return DistExecutor.unsafeCallWhenOn(Dist.CLIENT, () -> ClientSkillEngineBridge::clientGetAbilitySlots);
    }
}