// Niche Service - Niche selection and management
// Path: src/modules/content-generation/services/niche.service.ts

import { Injectable, Logger } from '@nestjs/common';

export interface Niche {
    id: string;
    name: string;
    slug: string;
    category: NicheCategory;
    description: string;
    targetAudience: string[];
    painPoints: string[];
    keywords: string[];
    contentAngles: string[];
    competitors: string[];
    monetization: string[];
    difficulty: 'beginner' | 'intermediate' | 'advanced';
    growthPotential: number; // 1-100
    engagement: {
        avgLikes: number;
        avgComments: number;
        avgShares: number;
    };
}

export type NicheCategory =
    | 'business'
    | 'finance'
    | 'health'
    | 'tech'
    | 'lifestyle'
    | 'education'
    | 'entertainment'
    | 'creative'
    | 'personal_development'
    | 'relationships'
    | 'career'
    | 'parenting';

export interface NicheAnalysis {
    niche: Niche;
    saturation: 'low' | 'medium' | 'high';
    competition: number; // 1-100
    opportunity: number; // 1-100
    trendingTopics: string[];
    contentGaps: string[];
    recommendedPlatforms: string[];
    monetizationPotential: number; // 1-100
}

@Injectable()
export class NicheService {
    private readonly logger = new Logger(NicheService.name);

    // Popular niches database
    private readonly niches: Niche[] = [
        {
            id: 'personal-finance',
            name: 'Personal Finance',
            slug: 'personal-finance',
            category: 'finance',
            description: 'Money management, investing, budgeting, and financial freedom',
            targetAudience: ['millennials', 'young professionals', 'families', 'retirees'],
            painPoints: ['debt', 'saving money', 'investing confusion', 'retirement anxiety'],
            keywords: ['budgeting', 'investing', 'passive income', 'financial freedom', 'side hustle'],
            contentAngles: ['beginner guides', 'investment strategies', 'debt payoff stories', 'money mistakes'],
            competitors: ['The Financial Diet', 'Graham Stephan', 'Dave Ramsey'],
            monetization: ['affiliate marketing', 'courses', 'coaching', 'sponsored content'],
            difficulty: 'intermediate',
            growthPotential: 85,
            engagement: { avgLikes: 500, avgComments: 50, avgShares: 100 },
        },
        {
            id: 'productivity',
            name: 'Productivity & Time Management',
            slug: 'productivity',
            category: 'personal_development',
            description: 'Work efficiency, habits, systems, and getting more done',
            targetAudience: ['entrepreneurs', 'remote workers', 'students', 'executives'],
            painPoints: ['procrastination', 'overwhelm', 'work-life balance', 'focus issues'],
            keywords: ['productivity tips', 'time management', 'habits', 'morning routine', 'deep work'],
            contentAngles: ['system breakdowns', 'tool reviews', 'habit building', 'workflow optimization'],
            competitors: ['Ali Abdaal', 'Thomas Frank', 'Cal Newport'],
            monetization: ['digital products', 'consulting', 'affiliate marketing', 'memberships'],
            difficulty: 'intermediate',
            growthPotential: 80,
            engagement: { avgLikes: 800, avgComments: 80, avgShares: 200 },
        },
        {
            id: 'ai-tech',
            name: 'AI & Technology',
            slug: 'ai-tech',
            category: 'tech',
            description: 'Artificial intelligence, automation, and emerging technology',
            targetAudience: ['tech enthusiasts', 'developers', 'entrepreneurs', 'business owners'],
            painPoints: ['keeping up with change', 'implementation', 'job automation fears', 'tool overload'],
            keywords: ['AI tools', 'ChatGPT', 'automation', 'machine learning', 'future of work'],
            contentAngles: ['tool tutorials', 'trend analysis', 'use cases', 'predictions'],
            competitors: ['Matt Wolfe', 'Linus Tech Tips', 'Fireship'],
            monetization: ['sponsorships', 'affiliate marketing', 'consulting', 'SaaS products'],
            difficulty: 'advanced',
            growthPotential: 95,
            engagement: { avgLikes: 1200, avgComments: 150, avgShares: 400 },
        },
        {
            id: 'content-creation',
            name: 'Content Creation & Social Media',
            slug: 'content-creation',
            category: 'creative',
            description: 'Growing on social media, creating content, and building an audience',
            targetAudience: ['aspiring creators', 'small businesses', 'influencers', 'marketers'],
            painPoints: ['algorithm changes', 'consistency', 'monetization', 'growth plateaus'],
            keywords: ['grow on Instagram', 'content strategy', 'viral content', 'engagement tips'],
            contentAngles: ['platform strategies', 'case studies', 'tool recommendations', 'growth hacks'],
            competitors: ['Vanessa Lau', 'Jade Darmawangsa', 'Roberto Blake'],
            monetization: ['courses', 'coaching', 'agency services', 'brand deals'],
            difficulty: 'intermediate',
            growthPotential: 75,
            engagement: { avgLikes: 600, avgComments: 100, avgShares: 150 },
        },
        {
            id: 'mental-health',
            name: 'Mental Health & Wellness',
            slug: 'mental-health',
            category: 'health',
            description: 'Mental wellness, anxiety, stress management, and self-care',
            targetAudience: ['young adults', 'stressed professionals', 'students', 'parents'],
            painPoints: ['anxiety', 'burnout', 'depression', 'overwhelm', 'self-doubt'],
            keywords: ['mental health tips', 'anxiety relief', 'self-care', 'therapy', 'mindfulness'],
            contentAngles: ['personal stories', 'coping strategies', 'professional insights', 'resources'],
            competitors: ['Therapy in a Nutshell', 'Dr. Julie Smith', 'The Holistic Psychologist'],
            monetization: ['books', 'courses', 'therapy referrals', 'speaking'],
            difficulty: 'advanced',
            growthPotential: 90,
            engagement: { avgLikes: 2000, avgComments: 300, avgShares: 500 },
        },
        {
            id: 'entrepreneurship',
            name: 'Entrepreneurship & Startups',
            slug: 'entrepreneurship',
            category: 'business',
            description: 'Starting and growing businesses, startup culture, and business strategy',
            targetAudience: ['founders', 'aspiring entrepreneurs', 'small business owners', 'investors'],
            painPoints: ['funding', 'scaling', 'finding customers', 'team building', 'failure fear'],
            keywords: ['startup tips', 'business ideas', 'entrepreneurship', 'funding', 'growth strategies'],
            contentAngles: ['founder stories', 'business frameworks', 'failure lessons', 'growth strategies'],
            competitors: ['GaryVee', 'Alex Hormozi', 'My First Million'],
            monetization: ['coaching', 'events', 'investments', 'courses'],
            difficulty: 'advanced',
            growthPotential: 85,
            engagement: { avgLikes: 1500, avgComments: 200, avgShares: 350 },
        },
        {
            id: 'fitness',
            name: 'Fitness & Exercise',
            slug: 'fitness',
            category: 'health',
            description: 'Workouts, gym routines, home fitness, and physical health',
            targetAudience: ['beginners', 'fitness enthusiasts', 'athletes', 'busy professionals'],
            painPoints: ['motivation', 'time constraints', 'plateau', 'injuries', 'gym intimidation'],
            keywords: ['workout routine', 'home workout', 'weight loss', 'muscle building', 'fitness tips'],
            contentAngles: ['workout demos', 'transformation stories', 'nutrition tips', 'myth busting'],
            competitors: ['Jeff Nippard', 'Athlean-X', 'Whitney Simmons'],
            monetization: ['programs', 'supplements', 'apparel', 'coaching'],
            difficulty: 'beginner',
            growthPotential: 70,
            engagement: { avgLikes: 3000, avgComments: 200, avgShares: 400 },
        },
        {
            id: 'parenting',
            name: 'Parenting & Family',
            slug: 'parenting',
            category: 'parenting',
            description: 'Raising children, family life, and parenting strategies',
            targetAudience: ['new parents', 'expecting parents', 'parents of teens', 'grandparents'],
            painPoints: ['sleep deprivation', 'discipline', 'education', 'work-life balance', 'screen time'],
            keywords: ['parenting tips', 'baby care', 'toddler', 'teen parenting', 'family activities'],
            contentAngles: ['age-specific tips', 'product reviews', 'real-life stories', 'expert advice'],
            competitors: ['Janet Lansbury', 'Dr. Becky', 'Big Little Feelings'],
            monetization: ['affiliate marketing', 'books', 'courses', 'brand partnerships'],
            difficulty: 'beginner',
            growthPotential: 75,
            engagement: { avgLikes: 1000, avgComments: 250, avgShares: 300 },
        },
    ];

    /**
     * Get all niches
     */
    getAllNiches(): Niche[] {
        return this.niches;
    }

    /**
     * Get niche by ID or slug
     */
    getNiche(idOrSlug: string): Niche | null {
        return this.niches.find((n) => n.id === idOrSlug || n.slug === idOrSlug) || null;
    }

    /**
     * Get niches by category
     */
    getNichesByCategory(category: NicheCategory): Niche[] {
        return this.niches.filter((n) => n.category === category);
    }

    /**
     * Analyze a niche
     */
    analyzeNiche(nicheId: string): NicheAnalysis | null {
        const niche = this.getNiche(nicheId);
        if (!niche) return null;

        const saturation = niche.growthPotential < 60 ? 'high' : niche.growthPotential < 80 ? 'medium' : 'low';
        const competition = 100 - niche.growthPotential + Math.random() * 20;

        return {
            niche,
            saturation,
            competition: Math.min(100, Math.round(competition)),
            opportunity: niche.growthPotential,
            trendingTopics: this.getTrendingTopics(niche),
            contentGaps: this.findContentGaps(niche),
            recommendedPlatforms: this.recommendPlatforms(niche),
            monetizationPotential: this.calculateMonetizationPotential(niche),
        };
    }

    /**
     * Recommend niches based on interests
     */
    recommendNiches(interests: string[]): Niche[] {
        const scored = this.niches.map((niche) => {
            let score = 0;
            const nicheText = [
                niche.name,
                niche.description,
                ...niche.keywords,
                ...niche.contentAngles,
            ].join(' ').toLowerCase();

            for (const interest of interests) {
                if (nicheText.includes(interest.toLowerCase())) {
                    score += 10;
                }
            }
            score += niche.growthPotential / 10;

            return { niche, score };
        });

        return scored
            .sort((a, b) => b.score - a.score)
            .slice(0, 5)
            .map((s) => s.niche);
    }

    /**
     * Get content ideas for a niche
     */
    getContentIdeas(nicheId: string, count: number = 10): string[] {
        const niche = this.getNiche(nicheId);
        if (!niche) return [];

        const ideas: string[] = [];
        const templates = [
            `${count} things nobody tells you about {keyword}`,
            `How to {keyword} without {pain_point}`,
            `Why most people fail at {keyword}`,
            `The complete guide to {keyword} for beginners`,
            `{keyword} mistakes I made (so you don't have to)`,
            `How I {keyword} in {time_period}`,
            `Stop doing this if you want to {keyword}`,
            `The truth about {keyword} that experts won't tell you`,
            `{keyword} tips that actually work in 2024`,
            `My {keyword} system that changed everything`,
        ];

        for (let i = 0; i < count; i++) {
            const template = templates[i % templates.length];
            const keyword = niche.keywords[i % niche.keywords.length];
            const painPoint = niche.painPoints[i % niche.painPoints.length];

            let idea = template
                .replace('{keyword}', keyword)
                .replace('{pain_point}', painPoint)
                .replace('{time_period}', '30 days')
                .replace('{count}', String(Math.floor(Math.random() * 7 + 3)));

            ideas.push(idea);
        }

        return ideas;
    }

    // Private helper methods

    private getTrendingTopics(niche: Niche): string[] {
        // Mock trending topics
        return niche.keywords.slice(0, 3).map((k) => `${k} 2024`);
    }

    private findContentGaps(niche: Niche): string[] {
        return [
            `Advanced ${niche.keywords[0]} strategies`,
            `${niche.name} for complete beginners`,
            `Common ${niche.keywords[1]} mistakes`,
            `${niche.name} case studies`,
        ];
    }

    private recommendPlatforms(niche: Niche): string[] {
        const platforms: string[] = [];

        if (niche.engagement.avgLikes > 1000) platforms.push('instagram', 'tiktok');
        if (niche.category === 'business' || niche.category === 'career') platforms.push('linkedin');
        if (niche.engagement.avgShares > 200) platforms.push('twitter');
        if (niche.difficulty === 'advanced') platforms.push('youtube');

        return platforms.length > 0 ? platforms : ['instagram', 'twitter'];
    }

    private calculateMonetizationPotential(niche: Niche): number {
        const monetizationScore = niche.monetization.length * 15;
        const difficultyBonus = niche.difficulty === 'advanced' ? 20 : niche.difficulty === 'intermediate' ? 10 : 0;
        return Math.min(100, monetizationScore + difficultyBonus);
    }
}