import { useMemo } from 'react';

const LEVEL_THRESHOLDS = [
    { level: 1, xp: 0, title: 'Rookie' },
    { level: 2, xp: 1000, title: 'Scout' },
    { level: 3, xp: 2500, title: 'Trekker' },
    { level: 4, xp: 5000, title: 'Pathfinder' },
    { level: 5, xp: 10000, title: 'Roof Warrior' },
    { level: 6, xp: 15000, title: 'Storm Chaser' },
    { level: 7, xp: 25000, title: 'Elite Operator' },
    { level: 8, xp: 40000, title: 'Neighborhood Boss' },
    { level: 9, xp: 60000, title: 'Commanding Officer' },
    { level: 10, xp: 100000, title: 'Legend' }
];

export const useGamification = (user, role = 'FIELD_AGENT') => {
    return useMemo(() => {
        if (!user) return null;

        const xp = user.xp || 0;

        // Calculate Level
        let currentLevelObj = LEVEL_THRESHOLDS[0];
        let nextLevelObj = LEVEL_THRESHOLDS[1];

        for (let i = 0; i < LEVEL_THRESHOLDS.length; i++) {
            if (xp >= LEVEL_THRESHOLDS[i].xp) {
                currentLevelObj = LEVEL_THRESHOLDS[i];
                nextLevelObj = LEVEL_THRESHOLDS[i + 1] || LEVEL_THRESHOLDS[i]; // Max level fallback
            } else {
                break;
            }
        }

        const { level, title } = currentLevelObj;

        // XP Progress
        let xpProgress = 100;
        let xpToNext = 0;
        let nextLevelXp = nextLevelObj.xp;
        let currentLevelBaseXp = currentLevelObj.xp;

        if (level < LEVEL_THRESHOLDS[LEVEL_THRESHOLDS.length - 1].level) {
            const range = nextLevelXp - currentLevelBaseXp;
            const progress = xp - currentLevelBaseXp;
            xpProgress = Math.min(100, Math.max(0, (progress / range) * 100));
            xpToNext = nextLevelXp - xp;
        }

        // --- PHASE 3: CHECKPOINTS & STAGES ---
        let STAGES = [];
        if (role === 'OWNER') {
            STAGES = [
                { id: 1, title: "Q1 Launch", requirement: { type: "onboarding", amount: 3 }, reward: { type: "coupon", name: "Territory Expansion", icon: "map" }, progress: 1, goal: 3 },
                { id: 2, title: "Market Domination", requirement: { type: "revenue", amount: 100 }, reward: { type: "giftcard", name: "Executive Suite Unlock", icon: "star" }, progress: 85, goal: 100 },
                { id: 3, title: "Empire Builder", requirement: { type: "deals", amount: 50 }, reward: { type: "cash", name: "Profit Share Tier 2", icon: "cash" }, progress: 20, goal: 50 }
            ];
        } else if (role === 'ADMIN') {
            STAGES = [
                { id: 1, title: "Squad Setup", requirement: { type: "recruits", amount: 5 }, reward: { type: "coupon", name: "Team Bonus Unlock", icon: "users" }, progress: 3, goal: 5 },
                { id: 2, title: "Territory Control", requirement: { type: "regions", amount: 4 }, reward: { type: "giftcard", name: "Admin Power-Up", icon: "zap" }, progress: 4, goal: 4 },
                { id: 3, title: "Regional Manager", requirement: { type: "sales", amount: 20 }, reward: { type: "cash", name: "Override Commission", icon: "cash" }, progress: 12, goal: 20 }
            ];
        } else {
            STAGES = [
                {
                    id: 1,
                    title: "Daily Grind",
                    requirement: { type: "dailyQuests", amount: 5 },
                    reward: { type: "xp", name: "+500 XP Boost", icon: "zap" },
                    progress: 5,
                    goal: 5
                },
                {
                    id: 2,
                    title: "Door Warrior",
                    requirement: { type: "doorsKnocked", amount: 40 },
                    reward: { type: "coupon", name: "$25 Gift Card", icon: "gift" },
                    progress: 40,
                    goal: 40
                },
                {
                    id: 3,
                    title: "Lead Machine",
                    requirement: { type: "leadsGained", amount: 10 },
                    reward: { type: "cash", name: "$50 Cash Bonus", icon: "cash" },
                    progress: 4,
                    goal: 10
                },
                {
                    id: 4,
                    title: "Closer Mode",
                    requirement: { type: "appointmentsSet", amount: 5 },
                    reward: { type: "giftcard", name: "$100 Amazon", icon: "amazon" },
                    progress: 0,
                    goal: 5
                },
                {
                    id: 5,
                    title: "Legend Run",
                    requirement: { type: "deals", amount: 3 },
                    reward: { type: "cash", name: "$250 Bonus", icon: "cash" },
                    progress: 0,
                    goal: 3
                }
            ];
        }

        // Determine lock states
        const stages = STAGES.map((s, idx) => {
            let status = "locked";
            if (s.progress >= s.goal) {
                status = "completed";
            } else if (idx === 0 || STAGES[idx - 1].progress >= STAGES[idx - 1].goal) {
                status = "in-progress";
            }
            return { ...s, status };
        });

        const activeStage = stages.find(s => s.status === "in-progress") || stages[stages.length - 1];

        // --- PHASE 3: DETAILED BADGE ARCHITECTURE ---
        // Mapping known string arrays from mockStore into detailed objects
        const BADGE_DEFINITIONS = [
            { id: 'Hot Spot Hunter', title: "Hot Spot Hunter", desc: "Identify 10 high-damage zones.", criteria: "10 Hot Leads identified." },
            { id: 'Storm Chaser', title: "Storm Chaser", desc: "Canvass a territory within 48h of a storm.", criteria: "1 Storm deployed operation." },
            { id: 'Star Closer', title: "Star Closer", desc: "Maintain a 50% conversion rate.", criteria: "Convert 5 deals continuously." },
            { id: 'Map Master', title: "Map Master", desc: "Knock 500 total doors.", criteria: "500 Lifetime Doors." },
            { id: 'First Knock', title: "First Knock", desc: "Complete your first day in the field.", criteria: "Log your first shift." }
        ];

        const badges = BADGE_DEFINITIONS.map(def => {
            const isUnlocked = (user.achievements || []).includes(def.id);
            return { ...def, status: isUnlocked ? 'unlocked' : 'locked' };
        });

        // Derived Stats
        const stats = {
            doorsKnocked: user.doorsKnocked || 0,
            leadsGained: user.leadsGained || 0,
            appointmentsSet: user.appointmentsSet || 0,
            streakDays: user.streakDays || 0,
        };

        return {
            level,
            title,
            currentXp: xp,
            nextLevelXp,
            xpProgress,
            xpToNext,
            stats,
            badges,
            stages,
            activeStage,
            achievements: user.achievements || [] // keeping for legacy
        };
    }, [user]);
};