/**
 * ╔═══════════════════════════════════════════════════════════════════════════╗
 * ║                    PREFRONTAL CORTEX SERVICE                               ║
 * ║═══════════════════════════════════════════════════════════════════════════║
 * ║  The system's executive function - strategic planning, goal management,   ║
 * ║  decision making, and coordinating other cognitive modules                ║
 * ║  • Goal Management: Define and track objectives                           ║
 * ║  • Strategic Planning: Break goals into actionable plans                  ║
 * ║  • Decision Making: Evaluate options with trade-off analysis              ║
 * ║  • Executive Control: Coordinate actions across modules                   ║
 * ╚═══════════════════════════════════════════════════════════════════════════╝
 */

import { neo4jAdapter } from '../adapters/Neo4jAdapter.js';
import { v4 as uuidv4 } from 'uuid';

// ═══════════════════════════════════════════════════════════════════════════
// Types
// ═══════════════════════════════════════════════════════════════════════════

export type GoalStatus = 'DRAFT' | 'ACTIVE' | 'IN_PROGRESS' | 'BLOCKED' | 'COMPLETED' | 'ABANDONED';
export type GoalPriority = 'CRITICAL' | 'HIGH' | 'MEDIUM' | 'LOW';
export type GoalTimeframe = 'IMMEDIATE' | 'SHORT_TERM' | 'MEDIUM_TERM' | 'LONG_TERM';

export interface Goal {
    id: string;
    title: string;
    description: string;
    status: GoalStatus;
    priority: GoalPriority;
    timeframe: GoalTimeframe;
    parentGoalId?: string; // For sub-goals
    successCriteria: string[];
    progress: number; // 0-100
    blockers: string[];
    dependencies: string[]; // Other goal IDs
    tags: string[];
    createdAt: string;
    updatedAt: string;
    targetDate?: string;
    completedAt?: string;
}

export interface Plan {
    id: string;
    goalId: string;
    title: string;
    steps: PlanStep[];
    status: 'DRAFT' | 'APPROVED' | 'EXECUTING' | 'COMPLETED' | 'FAILED';
    estimatedEffort: string; // e.g., "2 hours", "3 days"
    risks: PlanRisk[];
    createdAt: string;
    approvedAt?: string;
    approvedBy?: string;
}

export interface PlanStep {
    id: string;
    order: number;
    description: string;
    actionType?: string;
    status: 'PENDING' | 'IN_PROGRESS' | 'COMPLETED' | 'SKIPPED' | 'FAILED';
    dependencies: string[]; // Other step IDs
    output?: string;
    completedAt?: string;
}

export interface PlanRisk {
    id: string;
    description: string;
    probability: 'LOW' | 'MEDIUM' | 'HIGH';
    impact: 'LOW' | 'MEDIUM' | 'HIGH';
    mitigation: string;
}

export interface Decision {
    id: string;
    question: string;
    context: string;
    options: DecisionOption[];
    selectedOption?: string;
    rationale?: string;
    status: 'PENDING' | 'DECIDED' | 'IMPLEMENTED';
    decidedAt?: string;
    decidedBy?: string;
    createdAt: string;
}

export interface DecisionOption {
    id: string;
    name: string;
    description: string;
    pros: string[];
    cons: string[];
    risks: string[];
    score?: number; // Calculated score
}

// ═══════════════════════════════════════════════════════════════════════════
// Prefrontal Cortex Service
// ═══════════════════════════════════════════════════════════════════════════

class PrefrontalCortexService {
    private static instance: PrefrontalCortexService;

    private goals: Map<string, Goal> = new Map();
    private plans: Map<string, Plan> = new Map();
    private decisions: Map<string, Decision> = new Map();

    // Focus tracking
    private currentFocus: string | null = null;
    private focusHistory: { goalId: string; startedAt: string; endedAt?: string }[] = [];

    private constructor() {
        this.loadFromNeo4j();
    }

    public static getInstance(): PrefrontalCortexService {
        if (!PrefrontalCortexService.instance) {
            PrefrontalCortexService.instance = new PrefrontalCortexService();
        }
        return PrefrontalCortexService.instance;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Goal Management
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Create a new goal
     */
    public async createGoal(params: {
        title: string;
        description: string;
        priority?: GoalPriority;
        timeframe?: GoalTimeframe;
        parentGoalId?: string;
        successCriteria?: string[];
        targetDate?: string;
        tags?: string[];
    }): Promise<Goal> {
        const goal: Goal = {
            id: `goal-${uuidv4()}`,
            title: params.title,
            description: params.description,
            status: 'DRAFT',
            priority: params.priority || 'MEDIUM',
            timeframe: params.timeframe || 'MEDIUM_TERM',
            parentGoalId: params.parentGoalId,
            successCriteria: params.successCriteria || [],
            progress: 0,
            blockers: [],
            dependencies: [],
            tags: params.tags || [],
            createdAt: new Date().toISOString(),
            updatedAt: new Date().toISOString(),
            targetDate: params.targetDate
        };

        this.goals.set(goal.id, goal);
        await this.persistGoal(goal);

        console.error(`[PrefrontalCortex] 🎯 Created goal: ${goal.title}`);

        return goal;
    }

    /**
     * Activate a goal (move from DRAFT to ACTIVE)
     */
    public async activateGoal(goalId: string): Promise<Goal | null> {
        const goal = this.goals.get(goalId);
        if (!goal) return null;

        goal.status = 'ACTIVE';
        goal.updatedAt = new Date().toISOString();

        await this.persistGoal(goal);

        return goal;
    }

    /**
     * Update goal progress
     */
    public async updateGoalProgress(goalId: string, progress: number, status?: GoalStatus): Promise<Goal | null> {
        const goal = this.goals.get(goalId);
        if (!goal) return null;

        goal.progress = Math.min(100, Math.max(0, progress));
        goal.updatedAt = new Date().toISOString();

        if (status) {
            goal.status = status;
        } else if (progress >= 100) {
            goal.status = 'COMPLETED';
            goal.completedAt = new Date().toISOString();
        } else if (progress > 0 && goal.status === 'ACTIVE') {
            goal.status = 'IN_PROGRESS';
        }

        await this.persistGoal(goal);

        return goal;
    }

    /**
     * Add blocker to goal
     */
    public async addBlocker(goalId: string, blocker: string): Promise<Goal | null> {
        const goal = this.goals.get(goalId);
        if (!goal) return null;

        goal.blockers.push(blocker);
        goal.status = 'BLOCKED';
        goal.updatedAt = new Date().toISOString();

        await this.persistGoal(goal);

        console.error(`[PrefrontalCortex] 🚧 Goal blocked: ${goal.title} - ${blocker}`);

        return goal;
    }

    /**
     * Remove blocker from goal
     */
    public async removeBlocker(goalId: string, blockerIndex: number): Promise<Goal | null> {
        const goal = this.goals.get(goalId);
        if (!goal) return null;

        goal.blockers.splice(blockerIndex, 1);

        if (goal.blockers.length === 0 && goal.status === 'BLOCKED') {
            goal.status = goal.progress > 0 ? 'IN_PROGRESS' : 'ACTIVE';
        }

        goal.updatedAt = new Date().toISOString();
        await this.persistGoal(goal);

        return goal;
    }

    /**
     * Get goals by status or priority
     */
    public getGoals(filter?: {
        status?: GoalStatus;
        priority?: GoalPriority;
        timeframe?: GoalTimeframe;
        parentGoalId?: string;
    }): Goal[] {
        let results = Array.from(this.goals.values());

        if (filter?.status) {
            results = results.filter(g => g.status === filter.status);
        }
        if (filter?.priority) {
            results = results.filter(g => g.priority === filter.priority);
        }
        if (filter?.timeframe) {
            results = results.filter(g => g.timeframe === filter.timeframe);
        }
        if (filter?.parentGoalId !== undefined) {
            results = results.filter(g => g.parentGoalId === filter.parentGoalId);
        }

        // Sort by priority
        const priorityOrder = { CRITICAL: 0, HIGH: 1, MEDIUM: 2, LOW: 3 };
        return results.sort((a, b) => priorityOrder[a.priority] - priorityOrder[b.priority]);
    }

    /**
     * Get sub-goals for a goal
     */
    public getSubGoals(parentGoalId: string): Goal[] {
        return this.getGoals({ parentGoalId });
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Strategic Planning
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Create a plan for a goal
     */
    public async createPlan(params: {
        goalId: string;
        title: string;
        steps: Omit<PlanStep, 'id' | 'status' | 'completedAt'>[];
        estimatedEffort: string;
        risks?: Omit<PlanRisk, 'id'>[];
    }): Promise<Plan> {
        const plan: Plan = {
            id: `plan-${uuidv4()}`,
            goalId: params.goalId,
            title: params.title,
            steps: params.steps.map((s, i) => ({
                ...s,
                id: `step-${uuidv4()}`,
                order: i + 1,
                status: 'PENDING' as const
            })),
            status: 'DRAFT',
            estimatedEffort: params.estimatedEffort,
            risks: (params.risks || []).map(r => ({ ...r, id: `risk-${uuidv4()}` })),
            createdAt: new Date().toISOString()
        };

        this.plans.set(plan.id, plan);
        await this.persistPlan(plan);

        console.error(`[PrefrontalCortex] 📋 Created plan: ${plan.title} (${plan.steps.length} steps)`);

        return plan;
    }

    /**
     * Approve a plan
     */
    public async approvePlan(planId: string, approvedBy: string): Promise<Plan | null> {
        const plan = this.plans.get(planId);
        if (!plan) return null;

        plan.status = 'APPROVED';
        plan.approvedAt = new Date().toISOString();
        plan.approvedBy = approvedBy;

        await this.persistPlan(plan);

        return plan;
    }

    /**
     * Update plan step status
     */
    public async updatePlanStep(planId: string, stepId: string, status: PlanStep['status'], output?: string): Promise<Plan | null> {
        const plan = this.plans.get(planId);
        if (!plan) return null;

        const step = plan.steps.find(s => s.id === stepId);
        if (!step) return null;

        step.status = status;
        step.output = output;

        if (status === 'COMPLETED' || status === 'SKIPPED' || status === 'FAILED') {
            step.completedAt = new Date().toISOString();
        }

        // Update plan status
        const allComplete = plan.steps.every(s => s.status === 'COMPLETED' || s.status === 'SKIPPED');
        const anyFailed = plan.steps.some(s => s.status === 'FAILED');
        const anyInProgress = plan.steps.some(s => s.status === 'IN_PROGRESS');

        if (allComplete) {
            plan.status = 'COMPLETED';
        } else if (anyFailed) {
            plan.status = 'FAILED';
        } else if (anyInProgress) {
            plan.status = 'EXECUTING';
        }

        // Update goal progress
        const goal = this.goals.get(plan.goalId);
        if (goal) {
            const completedSteps = plan.steps.filter(s => s.status === 'COMPLETED').length;
            goal.progress = Math.round((completedSteps / plan.steps.length) * 100);
            await this.persistGoal(goal);
        }

        await this.persistPlan(plan);

        return plan;
    }

    /**
     * Get next step to execute in a plan
     */
    public getNextStep(planId: string): PlanStep | null {
        const plan = this.plans.get(planId);
        if (!plan || plan.status !== 'APPROVED' && plan.status !== 'EXECUTING') return null;

        // Find first pending step whose dependencies are met
        for (const step of plan.steps) {
            if (step.status !== 'PENDING') continue;

            const depsComplete = step.dependencies.every(depId => {
                const depStep = plan.steps.find(s => s.id === depId);
                return depStep && (depStep.status === 'COMPLETED' || depStep.status === 'SKIPPED');
            });

            if (depsComplete) {
                return step;
            }
        }

        return null;
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Decision Making
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Create a decision to be made
     */
    public async createDecision(params: {
        question: string;
        context: string;
        options: Omit<DecisionOption, 'id' | 'score'>[];
    }): Promise<Decision> {
        const decision: Decision = {
            id: `decision-${uuidv4()}`,
            question: params.question,
            context: params.context,
            options: params.options.map(o => ({
                ...o,
                id: `option-${uuidv4()}`,
                score: this.scoreOption(o)
            })),
            status: 'PENDING',
            createdAt: new Date().toISOString()
        };

        this.decisions.set(decision.id, decision);
        await this.persistDecision(decision);

        console.error(`[PrefrontalCortex] ❓ Decision pending: ${decision.question}`);

        return decision;
    }

    /**
     * Score a decision option based on pros/cons/risks
     */
    private scoreOption(option: Omit<DecisionOption, 'id' | 'score'>): number {
        let score = 50; // Start neutral

        // Pros add points
        score += option.pros.length * 10;

        // Cons subtract points
        score -= option.cons.length * 8;

        // Risks subtract based on severity (assumed from description length as proxy)
        score -= option.risks.length * 5;

        return Math.max(0, Math.min(100, score));
    }

    /**
     * Make a decision
     */
    public async makeDecision(decisionId: string, optionId: string, rationale: string, decidedBy: string): Promise<Decision | null> {
        const decision = this.decisions.get(decisionId);
        if (!decision) return null;

        decision.selectedOption = optionId;
        decision.rationale = rationale;
        decision.status = 'DECIDED';
        decision.decidedAt = new Date().toISOString();
        decision.decidedBy = decidedBy;

        await this.persistDecision(decision);

        const option = decision.options.find(o => o.id === optionId);
        console.error(`[PrefrontalCortex] ✅ Decision made: ${option?.name || optionId}`);

        return decision;
    }

    /**
     * Get pending decisions
     */
    public getPendingDecisions(): Decision[] {
        return Array.from(this.decisions.values()).filter(d => d.status === 'PENDING');
    }

    /**
     * Get recommendation for a decision
     */
    public getRecommendation(decisionId: string): { option: DecisionOption; rationale: string } | null {
        const decision = this.decisions.get(decisionId);
        if (!decision || decision.options.length === 0) return null;

        // Sort by score
        const sorted = [...decision.options].sort((a, b) => (b.score || 0) - (a.score || 0));
        const best = sorted[0];

        const rationale = `Recommended "${best.name}" based on: ${best.pros.length} pros vs ${best.cons.length} cons. Key advantages: ${best.pros.slice(0, 2).join(', ')}`;

        return { option: best, rationale };
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Executive Control / Focus Management
    // ═══════════════════════════════════════════════════════════════════════

    /**
     * Set current focus to a goal
     */
    public setFocus(goalId: string): void {
        if (this.currentFocus) {
            // End previous focus
            const lastFocus = this.focusHistory[this.focusHistory.length - 1];
            if (lastFocus && !lastFocus.endedAt) {
                lastFocus.endedAt = new Date().toISOString();
            }
        }

        this.currentFocus = goalId;
        this.focusHistory.push({
            goalId,
            startedAt: new Date().toISOString()
        });

        const goal = this.goals.get(goalId);
        console.error(`[PrefrontalCortex] 🎯 Focus set: ${goal?.title || goalId}`);
    }

    /**
     * Get current focus
     */
    public getCurrentFocus(): Goal | null {
        if (!this.currentFocus) return null;
        return this.goals.get(this.currentFocus) || null;
    }

    /**
     * Get executive summary
     */
    public getExecutiveSummary(): {
        currentFocus: Goal | null;
        activeGoals: number;
        blockedGoals: number;
        pendingDecisions: number;
        activePlans: number;
        overallProgress: number;
    } {
        const goals = Array.from(this.goals.values());
        const plans = Array.from(this.plans.values());

        const activeGoals = goals.filter(g => g.status === 'ACTIVE' || g.status === 'IN_PROGRESS');
        const totalProgress = activeGoals.reduce((sum, g) => sum + g.progress, 0);

        return {
            currentFocus: this.getCurrentFocus(),
            activeGoals: activeGoals.length,
            blockedGoals: goals.filter(g => g.status === 'BLOCKED').length,
            pendingDecisions: this.getPendingDecisions().length,
            activePlans: plans.filter(p => p.status === 'APPROVED' || p.status === 'EXECUTING').length,
            overallProgress: activeGoals.length > 0 ? Math.round(totalProgress / activeGoals.length) : 0
        };
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Persistence
    // ═══════════════════════════════════════════════════════════════════════

    private async persistGoal(goal: Goal): Promise<void> {
        try {
            await neo4jAdapter.executeQuery(`
                MERGE (g:Goal {id: $id})
                SET g.title = $title,
                    g.description = $description,
                    g.status = $status,
                    g.priority = $priority,
                    g.timeframe = $timeframe,
                    g.progress = $progress,
                    g.tags = $tags,
                    g.createdAt = $createdAt,
                    g.updatedAt = $updatedAt
            `, {
                id: goal.id,
                title: goal.title,
                description: goal.description,
                status: goal.status,
                priority: goal.priority,
                timeframe: goal.timeframe,
                progress: goal.progress,
                tags: goal.tags,
                createdAt: goal.createdAt,
                updatedAt: goal.updatedAt
            });
        } catch (error) {
            console.warn('[PrefrontalCortex] Failed to persist goal:', error);
        }
    }

    private async persistPlan(plan: Plan): Promise<void> {
        try {
            await neo4jAdapter.executeQuery(`
                MERGE (p:Plan {id: $id})
                SET p.goalId = $goalId,
                    p.title = $title,
                    p.status = $status,
                    p.estimatedEffort = $estimatedEffort,
                    p.stepCount = $stepCount,
                    p.createdAt = $createdAt
            `, {
                id: plan.id,
                goalId: plan.goalId,
                title: plan.title,
                status: plan.status,
                estimatedEffort: plan.estimatedEffort,
                stepCount: plan.steps.length,
                createdAt: plan.createdAt
            });
        } catch (error) {
            console.warn('[PrefrontalCortex] Failed to persist plan:', error);
        }
    }

    private async persistDecision(decision: Decision): Promise<void> {
        try {
            await neo4jAdapter.executeQuery(`
                MERGE (d:Decision {id: $id})
                SET d.question = $question,
                    d.status = $status,
                    d.optionCount = $optionCount,
                    d.selectedOption = $selectedOption,
                    d.createdAt = $createdAt,
                    d.decidedAt = $decidedAt
            `, {
                id: decision.id,
                question: decision.question,
                status: decision.status,
                optionCount: decision.options.length,
                selectedOption: decision.selectedOption || '',
                createdAt: decision.createdAt,
                decidedAt: decision.decidedAt || ''
            });
        } catch (error) {
            console.warn('[PrefrontalCortex] Failed to persist decision:', error);
        }
    }

    private async loadFromNeo4j(): Promise<void> {
        try {
            const goalResults = await neo4jAdapter.executeQuery(`
                MATCH (g:Goal)
                WHERE g.status IN ['ACTIVE', 'IN_PROGRESS', 'BLOCKED']
                RETURN g
                ORDER BY g.priority
                LIMIT 100
            `);

            for (const r of goalResults) {
                const g = r.g.properties;
                this.goals.set(g.id, {
                    id: g.id,
                    title: g.title,
                    description: g.description,
                    status: g.status,
                    priority: g.priority,
                    timeframe: g.timeframe,
                    progress: g.progress,
                    successCriteria: [],
                    blockers: [],
                    dependencies: [],
                    tags: g.tags || [],
                    createdAt: g.createdAt,
                    updatedAt: g.updatedAt
                });
            }

            console.error(`[PrefrontalCortex] 🔄 Loaded ${goalResults.length} active goals`);
        } catch (error) {
            console.warn('[PrefrontalCortex] Failed to load from Neo4j:', error);
        }
    }

    // ═══════════════════════════════════════════════════════════════════════
    // Status
    // ═══════════════════════════════════════════════════════════════════════

    public getStatus(): {
        totalGoals: number;
        activePlans: number;
        pendingDecisions: number;
        currentFocus: string | null;
    } {
        return {
            totalGoals: this.goals.size,
            activePlans: Array.from(this.plans.values()).filter(p => p.status === 'EXECUTING').length,
            pendingDecisions: this.getPendingDecisions().length,
            currentFocus: this.currentFocus
        };
    }
}

export const prefrontalCortex = PrefrontalCortexService.getInstance();