/**
 * usePanelStore - Centralized state management for canvas panels
 * 
 * This store manages the visibility and state of all panels in the canvas view.
 * Panels persist their state even when the user clicks elsewhere on the canvas.
 * 
 * Panel Types:
 * - introspection: Model introspection results (floating, draggable)
 * - validation: Spec validation errors/warnings (floating)
 * - results: Trial results details (floating)
 * - error: Error display with recovery options (floating)
 */

import { create } from 'zustand';
import { persist } from 'zustand/middleware';

// ============================================================================
// Types
// ============================================================================

export interface IntrospectionData {
  filePath: string;
  studyId?: string;
  selectedFile?: string;
  result?: Record<string, unknown>;
  isLoading?: boolean;
  error?: string | null;
}

export interface ValidationError {
  code: string;
  severity: 'error' | 'warning';
  path: string;
  message: string;
  suggestion?: string;
  nodeId?: string;
}

export interface ValidationData {
  valid: boolean;
  errors: ValidationError[];
  warnings: ValidationError[];
  checkedAt: number;
}

export interface OptimizationError {
  type: 'nx_crash' | 'solver_fail' | 'extractor_error' | 'config_error' | 'system_error' | 'unknown';
  trial?: number;
  message: string;
  details?: string;
  recoverable: boolean;
  suggestions: string[];
  timestamp: number;
}

export interface TrialResultData {
  trialNumber: number;
  params: Record<string, number>;
  objectives: Record<string, number>;
  constraints?: Record<string, { value: number; feasible: boolean }>;
  isFeasible: boolean;
  isBest: boolean;
  timestamp: number;
}

export interface PanelPosition {
  x: number;
  y: number;
}

export interface PanelState {
  open: boolean;
  position?: PanelPosition;
  minimized?: boolean;
}

export interface IntrospectionPanelState extends PanelState {
  data?: IntrospectionData;
}

export interface ValidationPanelState extends PanelState {
  data?: ValidationData;
}

export interface ErrorPanelState extends PanelState {
  errors: OptimizationError[];
}

export interface ResultsPanelState extends PanelState {
  data?: TrialResultData;
}

// ============================================================================
// Store Interface
// ============================================================================

interface PanelStore {
  // Panel states
  introspection: IntrospectionPanelState;
  validation: ValidationPanelState;
  error: ErrorPanelState;
  results: ResultsPanelState;
  
  // Generic panel actions
  openPanel: (panel: 'introspection' | 'validation' | 'error' | 'results') => void;
  closePanel: (panel: 'introspection' | 'validation' | 'error' | 'results') => void;
  togglePanel: (panel: 'introspection' | 'validation' | 'error' | 'results') => void;
  minimizePanel: (panel: 'introspection' | 'validation' | 'error' | 'results') => void;
  setPanelPosition: (panel: 'introspection' | 'validation' | 'error' | 'results', position: PanelPosition) => void;
  
  // Introspection-specific actions
  setIntrospectionData: (data: IntrospectionData) => void;
  updateIntrospectionResult: (result: Record<string, unknown>) => void;
  setIntrospectionLoading: (loading: boolean) => void;
  setIntrospectionError: (error: string | null) => void;
  setIntrospectionFile: (fileName: string) => void;
  
  // Validation-specific actions
  setValidationData: (data: ValidationData) => void;
  clearValidation: () => void;
  
  // Error-specific actions
  addError: (error: OptimizationError) => void;
  clearErrors: () => void;
  dismissError: (timestamp: number) => void;
  
  // Results-specific actions
  setTrialResult: (data: TrialResultData) => void;
  clearTrialResult: () => void;
  
  // Utility
  closeAllPanels: () => void;
  hasOpenPanels: () => boolean;
}

// ============================================================================
// Default States
// ============================================================================

const defaultIntrospection: IntrospectionPanelState = {
  open: false,
  position: { x: 100, y: 100 },
  minimized: false,
  data: undefined,
};

const defaultValidation: ValidationPanelState = {
  open: false,
  position: { x: 150, y: 150 },
  minimized: false,
  data: undefined,
};

const defaultError: ErrorPanelState = {
  open: false,
  position: { x: 200, y: 100 },
  minimized: false,
  errors: [],
};

const defaultResults: ResultsPanelState = {
  open: false,
  position: { x: 250, y: 150 },
  minimized: false,
  data: undefined,
};

// ============================================================================
// Store Implementation
// ============================================================================

export const usePanelStore = create<PanelStore>()(
  persist(
    (set, get) => ({
      // Initial states
      introspection: defaultIntrospection,
      validation: defaultValidation,
      error: defaultError,
      results: defaultResults,
      
      // Generic panel actions
      openPanel: (panel) => set((state) => ({
        [panel]: { ...state[panel], open: true, minimized: false }
      })),
      
      closePanel: (panel) => set((state) => ({
        [panel]: { ...state[panel], open: false }
      })),
      
      togglePanel: (panel) => set((state) => ({
        [panel]: { ...state[panel], open: !state[panel].open, minimized: false }
      })),
      
      minimizePanel: (panel) => set((state) => ({
        [panel]: { ...state[panel], minimized: !state[panel].minimized }
      })),
      
      setPanelPosition: (panel, position) => set((state) => ({
        [panel]: { ...state[panel], position }
      })),
      
      // Introspection actions
      setIntrospectionData: (data) => set((state) => ({
        introspection: { 
          ...state.introspection, 
          open: true, 
          data 
        }
      })),
      
      updateIntrospectionResult: (result) => set((state) => ({
        introspection: {
          ...state.introspection,
          data: state.introspection.data 
            ? { ...state.introspection.data, result, isLoading: false, error: null }
            : undefined
        }
      })),
      
      setIntrospectionLoading: (loading) => set((state) => ({
        introspection: {
          ...state.introspection,
          data: state.introspection.data
            ? { ...state.introspection.data, isLoading: loading }
            : undefined
        }
      })),
      
      setIntrospectionError: (error) => set((state) => ({
        introspection: {
          ...state.introspection,
          data: state.introspection.data
            ? { ...state.introspection.data, error, isLoading: false }
            : undefined
        }
      })),
      
      setIntrospectionFile: (fileName) => set((state) => ({
        introspection: {
          ...state.introspection,
          data: state.introspection.data
            ? { ...state.introspection.data, selectedFile: fileName }
            : undefined
        }
      })),
      
      // Validation actions
      setValidationData: (data) => set((state) => ({
        validation: { 
          ...state.validation, 
          open: true, 
          data 
        }
      })),
      
      clearValidation: () => set((state) => ({
        validation: { 
          ...state.validation, 
          data: undefined 
        }
      })),
      
      // Error actions
      addError: (error) => set((state) => ({
        error: {
          ...state.error,
          open: true,
          errors: [...state.error.errors, error]
        }
      })),
      
      clearErrors: () => set((state) => ({
        error: {
          ...state.error,
          errors: [],
          open: false
        }
      })),
      
      dismissError: (timestamp) => set((state) => {
        const newErrors = state.error.errors.filter(e => e.timestamp !== timestamp);
        return {
          error: {
            ...state.error,
            errors: newErrors,
            open: newErrors.length > 0
          }
        };
      }),
      
      // Results actions
      setTrialResult: (data) => set((state) => ({
        results: {
          ...state.results,
          open: true,
          data
        }
      })),
      
      clearTrialResult: () => set((state) => ({
        results: {
          ...state.results,
          data: undefined,
          open: false
        }
      })),
      
      // Utility
      closeAllPanels: () => set({
        introspection: { ...get().introspection, open: false },
        validation: { ...get().validation, open: false },
        error: { ...get().error, open: false },
        results: { ...get().results, open: false },
      }),
      
      hasOpenPanels: () => {
        const state = get();
        return state.introspection.open || 
               state.validation.open || 
               state.error.open || 
               state.results.open;
      },
    }),
    {
      name: 'atomizer-panel-store',
      // Only persist certain fields (not loading states or errors)
      partialize: (state) => ({
        introspection: {
          position: state.introspection.position,
          // Don't persist open state - start fresh each session
        },
        validation: {
          position: state.validation.position,
        },
        error: {
          position: state.error.position,
        },
        results: {
          position: state.results.position,
        },
      }),
    }
  )
);

// ============================================================================
// Selector Hooks (for convenience)
// ============================================================================

export const useIntrospectionPanel = () => usePanelStore((state) => state.introspection);
export const useValidationPanel = () => usePanelStore((state) => state.validation);
export const useErrorPanel = () => usePanelStore((state) => state.error);
export const useResultsPanel = () => usePanelStore((state) => state.results);

// Actions
export const usePanelActions = () => usePanelStore((state) => ({
  openPanel: state.openPanel,
  closePanel: state.closePanel,
  togglePanel: state.togglePanel,
  minimizePanel: state.minimizePanel,
  setPanelPosition: state.setPanelPosition,
  setIntrospectionData: state.setIntrospectionData,
  updateIntrospectionResult: state.updateIntrospectionResult,
  setIntrospectionLoading: state.setIntrospectionLoading,
  setIntrospectionError: state.setIntrospectionError,
  setIntrospectionFile: state.setIntrospectionFile,
  setValidationData: state.setValidationData,
  clearValidation: state.clearValidation,
  addError: state.addError,
  clearErrors: state.clearErrors,
  dismissError: state.dismissError,
  setTrialResult: state.setTrialResult,
  clearTrialResult: state.clearTrialResult,
  closeAllPanels: state.closeAllPanels,
}));