/**
 * Layer Effects Store
 * Manages non-destructive visual effects for layers
 */

import { create } from 'zustand';
import { persist } from 'zustand/middleware';
import type {
  LayerEffect,
  LayerEffectsConfig,
  EffectType,
} from '@/types/layer-effects';
import {
  DEFAULT_DROP_SHADOW,
  DEFAULT_OUTER_GLOW,
  DEFAULT_STROKE,
  DEFAULT_COLOR_OVERLAY,
  DEFAULT_INNER_SHADOW,
  DEFAULT_INNER_GLOW,
  DEFAULT_BEVEL,
} from '@/types/layer-effects';

interface LayerEffectsStore {
  // Layer effects configurations (one per layer)
  layerEffects: Map<string, LayerEffectsConfig>;

  // Global light settings (shared across effects that use it)
  globalLightAngle: number;
  globalLightAltitude: number;

  // Actions
  getLayerEffects: (layerId: string) => LayerEffectsConfig | undefined;
  setLayerEffectsEnabled: (layerId: string, enabled: boolean) => void;
  addEffect: (layerId: string, effectType: EffectType) => void;
  removeEffect: (layerId: string, effectId: string) => void;
  updateEffect: (layerId: string, effectId: string, updates: Partial<LayerEffect>) => void;
  toggleEffect: (layerId: string, effectId: string) => void;
  reorderEffect: (layerId: string, effectId: string, newIndex: number) => void;
  duplicateEffect: (layerId: string, effectId: string) => void;
  clearLayerEffects: (layerId: string) => void;
  setGlobalLight: (angle: number, altitude: number) => void;

  // Preset management
  copyEffects: (fromLayerId: string) => LayerEffect[] | null;
  pasteEffects: (toLayerId: string, effects: LayerEffect[]) => void;
}

// Helper to create default effect by type
function createDefaultEffect(type: EffectType): Omit<LayerEffect, 'id'> {
  const defaults = {
    dropShadow: DEFAULT_DROP_SHADOW,
    outerGlow: DEFAULT_OUTER_GLOW,
    stroke: DEFAULT_STROKE,
    colorOverlay: DEFAULT_COLOR_OVERLAY,
    innerShadow: DEFAULT_INNER_SHADOW,
    innerGlow: DEFAULT_INNER_GLOW,
    bevel: DEFAULT_BEVEL,
    // TODO: Add defaults for remaining effect types
    gradientOverlay: DEFAULT_COLOR_OVERLAY, // Placeholder
    patternOverlay: DEFAULT_COLOR_OVERLAY, // Placeholder
    satin: DEFAULT_INNER_SHADOW, // Placeholder
  };

  return defaults[type] as Omit<LayerEffect, 'id'>;
}

export const useLayerEffectsStore = create<LayerEffectsStore>()(
  persist(
    (set, get) => ({
      layerEffects: new Map(),
      globalLightAngle: 120,
      globalLightAltitude: 30,

      getLayerEffects: (layerId: string) => {
        return get().layerEffects.get(layerId);
      },

      setLayerEffectsEnabled: (layerId: string, enabled: boolean) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);
          if (config) {
            newMap.set(layerId, { ...config, enabled });
          }
          return { layerEffects: newMap };
        }),

      addEffect: (layerId: string, effectType: EffectType) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          let config = newMap.get(layerId);

          const newEffect: LayerEffect = {
            ...createDefaultEffect(effectType),
            id: `effect-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
            type: effectType,
          } as LayerEffect;

          if (!config) {
            // Create new config for this layer
            config = {
              layerId,
              effects: [newEffect],
              enabled: true,
              globalLightAngle: state.globalLightAngle,
              globalLightAltitude: state.globalLightAltitude,
            };
          } else {
            // Add effect to existing config
            config = {
              ...config,
              effects: [...config.effects, newEffect],
            };
          }

          newMap.set(layerId, config);
          return { layerEffects: newMap };
        }),

      removeEffect: (layerId: string, effectId: string) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);

          if (config) {
            const newEffects = config.effects.filter((e) => e.id !== effectId);
            if (newEffects.length === 0) {
              // Remove config if no effects left
              newMap.delete(layerId);
            } else {
              newMap.set(layerId, { ...config, effects: newEffects });
            }
          }

          return { layerEffects: newMap };
        }),

      updateEffect: (layerId: string, effectId: string, updates: Partial<LayerEffect>) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);

          if (config) {
            const newEffects = config.effects.map((effect) =>
              effect.id === effectId ? ({ ...effect, ...updates } as LayerEffect) : effect
            );
            newMap.set(layerId, { ...config, effects: newEffects });
          }

          return { layerEffects: newMap };
        }),

      toggleEffect: (layerId: string, effectId: string) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);

          if (config) {
            const newEffects = config.effects.map((effect) =>
              effect.id === effectId
                ? { ...effect, enabled: !effect.enabled }
                : effect
            );
            newMap.set(layerId, { ...config, effects: newEffects });
          }

          return { layerEffects: newMap };
        }),

      reorderEffect: (layerId: string, effectId: string, newIndex: number) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);

          if (config) {
            const effects = [...config.effects];
            const currentIndex = effects.findIndex((e) => e.id === effectId);

            if (currentIndex !== -1) {
              const [effect] = effects.splice(currentIndex, 1);
              effects.splice(newIndex, 0, effect);
              newMap.set(layerId, { ...config, effects });
            }
          }

          return { layerEffects: newMap };
        }),

      duplicateEffect: (layerId: string, effectId: string) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          const config = newMap.get(layerId);

          if (config) {
            const effect = config.effects.find((e) => e.id === effectId);
            if (effect) {
              const newEffect: LayerEffect = {
                ...effect,
                id: `effect-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
              };
              const effectIndex = config.effects.findIndex((e) => e.id === effectId);
              const newEffects = [
                ...config.effects.slice(0, effectIndex + 1),
                newEffect,
                ...config.effects.slice(effectIndex + 1),
              ];
              newMap.set(layerId, { ...config, effects: newEffects });
            }
          }

          return { layerEffects: newMap };
        }),

      clearLayerEffects: (layerId: string) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          newMap.delete(layerId);
          return { layerEffects: newMap };
        }),

      setGlobalLight: (angle: number, altitude: number) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);

          // Update global light for all layer configs
          newMap.forEach((config, layerId) => {
            newMap.set(layerId, {
              ...config,
              globalLightAngle: angle,
              globalLightAltitude: altitude,
            });
          });

          return {
            globalLightAngle: angle,
            globalLightAltitude: altitude,
            layerEffects: newMap,
          };
        }),

      copyEffects: (fromLayerId: string) => {
        const config = get().layerEffects.get(fromLayerId);
        return config ? [...config.effects] : null;
      },

      pasteEffects: (toLayerId: string, effects: LayerEffect[]) =>
        set((state) => {
          const newMap = new Map(state.layerEffects);
          let config = newMap.get(toLayerId);

          // Clone effects with new IDs
          const newEffects = effects.map((effect) => ({
            ...effect,
            id: `effect-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`,
          }));

          if (!config) {
            config = {
              layerId: toLayerId,
              effects: newEffects,
              enabled: true,
              globalLightAngle: state.globalLightAngle,
              globalLightAltitude: state.globalLightAltitude,
            };
          } else {
            config = {
              ...config,
              effects: [...config.effects, ...newEffects],
            };
          }

          newMap.set(toLayerId, config);
          return { layerEffects: newMap };
        }),
    }),
    {
      name: 'layer-effects-storage',
      partialize: (state) => ({
        layerEffects: Array.from(state.layerEffects.entries()),
        globalLightAngle: state.globalLightAngle,
        globalLightAltitude: state.globalLightAltitude,
      }),
      merge: (persistedState: any, currentState) => {
        // Convert array back to Map
        const layerEffects = new Map(
          (persistedState?.layerEffects || []) as [string, LayerEffectsConfig][]
        );

        return {
          ...currentState,
          layerEffects,
          globalLightAngle: persistedState?.globalLightAngle ?? currentState.globalLightAngle,
          globalLightAltitude:
            persistedState?.globalLightAltitude ?? currentState.globalLightAltitude,
        };
      },
    }
  )
);