{% extends "base.html" %}
{% block title %}Pair Trader{% endblock %}

{% block content %}
<div x-data="pairTraderPanel()" x-init="init()" class="space-y-6">

    <!-- Header -->
    <div class="flex flex-col sm:flex-row sm:items-center justify-between gap-4">
        <div>
            <h1 class="text-2xl font-bold text-white flex items-center gap-3">
                <div class="p-2 bg-cyan-600/20 rounded-xl">
                    <svg class="w-6 h-6 text-cyan-400" fill="none" stroke="currentColor" stroke-width="2" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" d="M7.5 21L3 16.5m0 0L7.5 12M3 16.5h13.5m0-13.5L21 7.5m0 0L16.5 12M21 7.5H7.5"/></svg>
                </div>
                Pair Trader
            </h1>
            <p class="text-gray-400 text-sm mt-1">Correlated pair divergence/convergence opportunities</p>
        </div>
        <div class="flex items-center gap-3">
            <span class="text-xs text-gray-500" x-text="lastRefresh ? 'Updated: ' + lastRefresh : ''"></span>
            <button @click="fetchData()" :disabled="loading"
                    class="px-4 py-2 bg-cyan-600 hover:bg-cyan-500 text-white text-sm font-medium rounded-lg transition disabled:opacity-50 flex items-center gap-2">
                <svg x-show="loading" class="w-4 h-4 animate-spin" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"/><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"/></svg>
                <span x-text="loading ? 'Scanning...' : 'Refresh'"></span>
            </button>
        </div>
    </div>

    <!-- Loading -->
    <div x-show="loading && items.length === 0" x-cloak class="flex items-center justify-center py-16">
        <div class="text-center">
            <svg class="w-8 h-8 animate-spin text-cyan-400 mx-auto mb-3" fill="none" viewBox="0 0 24 24">
                <circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"/>
                <path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"/>
            </svg>
            <p class="text-sm text-gray-500">Finding pair trading opportunities...</p>
        </div>
    </div>

    <!-- Error -->
    <div x-show="error" x-cloak class="bg-red-900/20 border border-red-800 rounded-xl p-4">
        <p class="text-sm text-red-400" x-text="error"></p>
    </div>

    <!-- Content -->
    <div x-show="!loading || items.length > 0" x-cloak>

        <!-- Stat Cards -->
        <div class="grid grid-cols-2 md:grid-cols-4 gap-4 mb-6">
            <div class="bg-gray-800 border border-gray-700 rounded-xl p-4">
                <div class="text-xs text-gray-400 uppercase tracking-wider">Total Pairs</div>
                <div class="text-2xl font-bold text-white mt-1" x-text="stats.total || items.length"></div>
            </div>
            <div class="bg-gray-800 border border-emerald-700/30 rounded-xl p-4">
                <div class="text-xs text-gray-400 uppercase tracking-wider">Diverging</div>
                <div class="text-2xl font-bold text-emerald-400 mt-1" x-text="stats.diverging_count || 0"></div>
            </div>
            <div class="bg-gray-800 border border-amber-700/30 rounded-xl p-4">
                <div class="text-xs text-gray-400 uppercase tracking-wider">Converging</div>
                <div class="text-2xl font-bold text-amber-400 mt-1" x-text="stats.converging_count || 0"></div>
            </div>
            <div class="bg-gray-800 border border-cyan-700/30 rounded-xl p-4">
                <div class="text-xs text-gray-400 uppercase tracking-wider">Best Pair</div>
                <div class="text-lg font-bold text-cyan-400 mt-1 truncate" x-text="stats.best_pair_display || '-'"></div>
            </div>
        </div>

        <!-- Info Box -->
        <div class="bg-cyan-900/15 border border-cyan-700/25 rounded-xl p-4 mb-6">
            <div class="flex items-start gap-3">
                <svg class="w-5 h-5 text-cyan-400 mt-0.5 flex-shrink-0" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M13 16h-1v-4h-1m1-4h.01M21 12a9 9 0 11-18 0 9 9 0 0118 0z"/></svg>
                <div>
                    <h4 class="text-sm font-medium text-cyan-300">Pair Trading Opportunities</h4>
                    <p class="text-xs text-gray-400 mt-1">For each asset, the most correlated peer is identified. When the spread between them diverges beyond normal (high Z-score), a <strong class="text-gray-300">mean reversion</strong> trade opportunity exists. <strong class="text-emerald-400">DIVERGING</strong> = entry opportunity, <strong class="text-amber-400">CONVERGING</strong> = spread normalising.</p>
                </div>
            </div>
        </div>

        <!-- Filters -->
        <div class="flex flex-col sm:flex-row gap-3 mb-6">
            <div class="flex gap-1 bg-gray-900 p-1 rounded-xl border border-gray-700">
                <template x-for="f in [{v:'all',l:'All'},{v:'diverging',l:'Diverging'},{v:'converging',l:'Converging'},{v:'correlated',l:'Correlated'},{v:'uncorrelated',l:'Uncorr.'}]" :key="f.v">
                    <button @click="statusFilter = f.v; fetchData()"
                            class="px-3 py-1.5 text-xs font-medium rounded-lg transition"
                            :class="statusFilter === f.v ? 'bg-cyan-600 text-white' : 'text-gray-400 hover:text-gray-300 hover:bg-gray-800'"
                            x-text="f.l"></button>
                </template>
            </div>
            <div class="relative flex-1">
                <svg class="absolute left-3 top-1/2 -translate-y-1/2 w-4 h-4 text-gray-500" fill="none" stroke="currentColor" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z"/></svg>
                <input type="text" x-model="search" placeholder="Search symbol or pair..."
                       class="w-full pl-10 pr-4 py-2 bg-gray-800 border border-gray-700 rounded-lg text-sm text-gray-200 focus:outline-none focus:ring-1 focus:ring-cyan-500">
            </div>
        </div>

        <!-- Cards Grid -->
        <div class="grid grid-cols-1 lg:grid-cols-2 gap-4">
            <template x-for="(item, idx) in filteredItems" :key="item.asset_id + '-' + idx">
                <div class="bg-gray-800 border border-gray-700 rounded-xl p-5 hover:border-gray-600 transition">
                    <!-- Header: symbol + pair + score -->
                    <div class="flex items-center justify-between mb-3">
                        <div class="flex items-center gap-2 min-w-0">
                            <img :src="item.icon_thumb_url" class="w-7 h-7 rounded-full bg-gray-700 flex-shrink-0" onerror="this.style.display='none'">
                            <div class="min-w-0">
                                <span class="text-white font-bold text-base" x-text="item.symbol"></span>
                                <span class="text-gray-500 text-xs ml-1 hidden sm:inline" x-text="item.name"></span>
                            </div>
                        </div>
                        <div class="text-right flex-shrink-0">
                            <div class="text-2xl font-black"
                                 :class="item.opportunity_score >= 70 ? 'text-cyan-400' : item.opportunity_score >= 40 ? 'text-amber-400' : 'text-gray-400'"
                                 x-text="fmt(item.opportunity_score, 0)"></div>
                            <div class="text-[10px] text-gray-500 -mt-0.5">opp. score</div>
                        </div>
                    </div>

                    <!-- Status Badge + Best Pair -->
                    <div class="flex items-center justify-between mb-3">
                        <span class="px-2.5 py-1 text-xs font-semibold rounded-full"
                              :class="statusBadge(item.status)"
                              x-text="item.status"></span>
                        <div class="flex items-center gap-1.5 text-sm">
                            <span class="text-gray-500">Pair:</span>
                            <img :src="item.best_pair_icon" class="w-4 h-4 rounded-full bg-gray-700" onerror="this.style.display='none'">
                            <span class="text-cyan-300 font-medium" x-text="item.best_pair_symbol"></span>
                        </div>
                    </div>

                    <!-- Spread Z-Score Bar -->
                    <div class="bg-gray-900/60 border border-gray-700/50 rounded-lg p-3 mb-3">
                        <div class="flex items-center justify-between text-xs mb-1.5">
                            <span class="text-gray-500">Spread Z-Score</span>
                            <span class="font-bold"
                                  :class="Math.abs(item.spread_z_score || 0) >= 1.5 ? 'text-cyan-400' : 'text-gray-300'"
                                  x-text="fmt(item.spread_z_score, 2)"></span>
                        </div>
                        <div class="relative w-full bg-gray-700 rounded-full h-2.5">
                            <div class="absolute left-1/2 top-0 w-0.5 h-2.5 bg-gray-500 z-10"></div>
                            <div class="absolute top-0 h-2.5 rounded-full transition-all"
                                 :class="(item.spread_z_score || 0) < 0 ? 'bg-emerald-500' : 'bg-red-500'"
                                 :style="zBarStyle(item.spread_z_score)"></div>
                        </div>
                        <div class="flex justify-between text-[10px] text-gray-600 mt-1">
                            <span>-3</span>
                            <span>0</span>
                            <span>+3</span>
                        </div>
                    </div>

                    <!-- Metrics Grid -->
                    <div class="grid grid-cols-3 gap-2 mb-3">
                        <div class="bg-gray-900/40 rounded-lg p-2 text-center">
                            <div class="text-[10px] text-gray-500">Correlation</div>
                            <div class="text-sm font-bold mt-0.5"
                                 :class="(item.correlation || 0) >= 0.8 ? 'text-emerald-400' : (item.correlation || 0) >= 0.55 ? 'text-amber-400' : 'text-red-400'"
                                 x-text="fmt(item.correlation, 3)"></div>
                        </div>
                        <div class="bg-gray-900/40 rounded-lg p-2 text-center">
                            <div class="text-[10px] text-gray-500">Half-Life</div>
                            <div class="text-sm font-medium text-gray-300 mt-0.5"
                                 x-text="item.half_life != null ? fmt(item.half_life, 1) + 'd' : '-'"></div>
                        </div>
                        <div class="bg-gray-900/40 rounded-lg p-2 text-center">
                            <div class="text-[10px] text-gray-500">MR Conf.</div>
                            <div class="text-sm font-medium mt-0.5"
                                 :class="item.mr_confidence === 'HIGH' ? 'text-emerald-400' : item.mr_confidence === 'MEDIUM' ? 'text-amber-400' : 'text-gray-500'"
                                 x-text="item.mr_confidence || '-'"></div>
                        </div>
                    </div>

                    <!-- Price Changes -->
                    <div class="grid grid-cols-2 gap-2 mb-3">
                        <div class="bg-gray-900/30 rounded-lg px-3 py-2">
                            <div class="text-[10px] text-gray-500 mb-0.5" x-text="item.symbol + ' 24h'"></div>
                            <span class="text-xs font-medium"
                                  :class="(item.price_change_24h || 0) >= 0 ? 'text-emerald-400' : 'text-red-400'"
                                  x-text="fmtPct(item.price_change_24h)"></span>
                        </div>
                        <div class="bg-gray-900/30 rounded-lg px-3 py-2">
                            <div class="text-[10px] text-gray-500 mb-0.5" x-text="item.best_pair_symbol + ' 24h'"></div>
                            <span class="text-xs font-medium"
                                  :class="(item.best_pair_change_24h || 0) >= 0 ? 'text-emerald-400' : 'text-red-400'"
                                  x-text="fmtPct(item.best_pair_change_24h)"></span>
                        </div>
                    </div>

                    <!-- Spread Direction + Range Position -->
                    <div class="flex items-center justify-between text-xs border-t border-gray-700 pt-2.5">
                        <span class="px-2 py-0.5 rounded text-[10px] font-medium"
                              :class="item.spread_direction === 'WIDENING' ? 'bg-red-900/30 text-red-400' : item.spread_direction === 'NARROWING' ? 'bg-emerald-900/30 text-emerald-400' : 'bg-gray-700 text-gray-400'"
                              x-text="'Spread: ' + (item.spread_direction || '-')"></span>
                        <span class="text-gray-400" x-show="item.range_position != null">
                            Range: <span class="font-medium text-gray-300" x-text="fmt(item.range_position, 0) + '%'"></span>
                        </span>
                        <span class="text-gray-500" x-text="fmtPrice(item.current_price_idr)"></span>
                    </div>
                </div>
            </template>
        </div>

        <!-- Load More -->
        <div x-show="hasMore" class="text-center mt-6">
            <button @click="loadMore()" :disabled="loading"
                    class="px-6 py-2 bg-gray-800 border border-gray-700 text-gray-300 hover:text-white hover:border-gray-600 text-sm rounded-lg transition disabled:opacity-50">
                Load More
            </button>
        </div>

        <!-- Empty States -->
        <div x-show="filteredItems.length === 0 && items.length > 0" x-cloak class="text-center py-16">
            <svg class="w-12 h-12 text-gray-600 mx-auto mb-3" fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" d="M21 21l-5.197-5.197m0 0A7.5 7.5 0 105.196 5.196a7.5 7.5 0 0010.607 10.607z"/></svg>
            <p class="text-gray-500">No pairs matching your filters</p>
        </div>
        <div x-show="items.length === 0 && !loading && !error" x-cloak class="text-center py-16">
            <svg class="w-12 h-12 text-gray-600 mx-auto mb-3" fill="none" stroke="currentColor" stroke-width="1.5" viewBox="0 0 24 24"><path stroke-linecap="round" stroke-linejoin="round" d="M7.5 21L3 16.5m0 0L7.5 12M3 16.5h13.5m0-13.5L21 7.5m0 0L16.5 12M21 7.5H7.5"/></svg>
            <p class="text-gray-500">No pair data available. Click Refresh to scan.</p>
        </div>
    </div>
</div>
{% endblock %}

{% block scripts %}
<script>
function pairTraderPanel() {
    return {
        loading: false, error: null, lastRefresh: null,
        items: [], stats: {},
        search: '', statusFilter: 'all',
        currentPage: 1, hasMore: false,

        get filteredItems() {
            if (!this.search) return this.items;
            const q = this.search.toUpperCase();
            return this.items.filter(i =>
                (i.symbol || '').toUpperCase().includes(q) ||
                (i.name || '').toUpperCase().includes(q) ||
                (i.best_pair_symbol || '').toUpperCase().includes(q)
            );
        },

        statusBadge(s) {
            const m = {
                'DIVERGING': 'bg-emerald-900/50 text-emerald-300 border border-emerald-700/30',
                'CONVERGING': 'bg-amber-900/50 text-amber-300 border border-amber-700/30',
                'CORRELATED': 'bg-cyan-900/50 text-cyan-300 border border-cyan-700/30',
                'UNCORRELATED': 'bg-gray-700 text-gray-400',
            };
            return m[(s || '').toUpperCase()] || 'bg-gray-700 text-gray-400';
        },

        zBarStyle(z) {
            const val = Math.max(-3, Math.min(3, z || 0));
            const pct = ((val + 3) / 6) * 100;
            const center = 50;
            if (pct < center) {
                return 'left:' + pct + '%;width:' + (center - pct) + '%';
            } else {
                return 'left:' + center + '%;width:' + (pct - center) + '%';
            }
        },

        init() { this.fetchData(); },

        async fetchData() {
            this.loading = true; this.error = null; this.currentPage = 1;
            try {
                const params = new URLSearchParams({
                    asset_type: '{{ asset_mode }}',
                    limit: '50', page: '1',
                    status: this.statusFilter,
                });
                const res = await fetch('/api/v1/market/screener/pair-trader?' + params);
                if (res.redirected) { window.location.href = res.url; return; }
                const json = await res.json();
                if (json.error) { this.error = json.error; }
                else {
                    this.items = json.items || [];
                    this.stats = json.stats || {};
                    this.hasMore = json.has_more || false;
                }
            } catch (e) { this.error = 'Failed to load: ' + e.message; }
            finally { this.loading = false; this.lastRefresh = new Date().toLocaleTimeString('id-ID'); }
        },

        async loadMore() {
            if (this.loading || !this.hasMore) return;
            this.loading = true;
            this.currentPage++;
            try {
                const params = new URLSearchParams({
                    asset_type: '{{ asset_mode }}',
                    limit: '50', page: String(this.currentPage),
                    status: this.statusFilter,
                });
                const res = await fetch('/api/v1/market/screener/pair-trader?' + params);
                const json = await res.json();
                if (json.items) {
                    this.items = this.items.concat(json.items);
                    this.hasMore = json.has_more || false;
                }
            } catch (e) { this.error = 'Load more failed: ' + e.message; }
            finally { this.loading = false; }
        },

        fmt(n, d=2) { return n != null ? Number(n).toFixed(d) : '-'; },
        fmtPct(n) { return n != null ? (n >= 0 ? '+' : '') + Number(n).toFixed(2) + '%' : '-'; },
        fmtPrice(n) { return n != null ? 'Rp ' + Number(n).toLocaleString('id-ID') : '-'; },
    };
}
</script>
{% endblock %}