{% extends "base.html" %}
{% block title %}Insights{% endblock %}

{% block content %}
<div class="ins-page">
    <h1 class="ins-title">Financial Insights</h1>

    {% if months_with_data == 0 %}
    <div class="card-v3" style="color: var(--text-muted); text-align: center; padding: 48px;">
        No data yet. Add transactions to see your financial trends.
    </div>
    {% else %}

    <!-- ===== SUMMARY ROW ===== -->
    <div class="ins-summary">

        <div class="ins-metric-card">
            <div class="ins-metric-label">Avg Savings Rate</div>
            <div class="ins-metric-value">{{ "%.0f"|format(avg_savings_rate_pct) }}%</div>
            <div class="ins-metric-sub">last {{ months_with_data }} month{% if months_with_data != 1 %}s{% endif %}</div>
        </div>

        <div class="ins-metric-card">
            <div class="ins-metric-label">Income Stability</div>
            <div class="ins-metric-value ins-stability-{{ income_stability }}">
                {{ income_stability | capitalize }}
            </div>
            <div class="ins-metric-sub">
                {% if income_stability == "stable" %}CV &lt; 10%
                {% elif income_stability == "moderate" %}CV 10–25%
                {% else %}CV &gt; 25%{% endif %}
            </div>
        </div>

        <div class="ins-metric-card">
            <div class="ins-metric-label">Savings Streak</div>
            <div class="ins-metric-value">{{ savings_streak }}</div>
            <div class="ins-metric-sub">
                {% if savings_streak == 0 %}no positive months
                {% elif savings_streak == 1 %}month running
                {% else %}months running{% endif %}
            </div>
        </div>

    </div>

    <!-- ===== SPARKLINE ===== -->
    {% if savings_history | length > 1 %}
    {% set rates = savings_history | map(attribute='savings_rate_pct') | list %}
    {% set max_rate = rates | max %}
    {% set min_rate = rates | min %}
    {% set range_rate = (max_rate - min_rate) if (max_rate - min_rate) > 0 else 1 %}
    {% set chart_h = 80 %}
    {% set chart_w = 480 %}
    {% set n = savings_history | length %}
    {% set step = (chart_w / (n - 1)) if n > 1 else chart_w %}
    <div class="card-v3">
        <div class="card-title-v3">Savings Rate — {{ n }} Months</div>
        <svg viewBox="0 0 {{ chart_w }} {{ chart_h + 20 }}"
             style="width:100%;max-width:600px;display:block;overflow:visible;"
             aria-label="{{ n }}-month savings rate chart">
            <!-- 20% target line -->
            {% set target_y = chart_h - ((20 - min_rate) / range_rate * chart_h) %}
            {% if target_y >= 0 and target_y <= chart_h %}
            <line x1="0" y1="{{ target_y | int }}" x2="{{ chart_w }}" y2="{{ target_y | int }}"
                  stroke="#374151" stroke-width="1" stroke-dasharray="4 3"/>
            <text x="{{ chart_w - 2 }}" y="{{ (target_y - 3) | int }}"
                  font-size="9" fill="#6b7280" text-anchor="end">20% target</text>
            {% endif %}
            <!-- Sparkline polyline -->
            <polyline
                points="{% for entry in savings_history %}{{ ((loop.index0 * step) | int) }},{{ ((chart_h - ((entry.savings_rate_pct - min_rate) / range_rate * chart_h)) | int) }} {% endfor %}"
                fill="none" stroke="#60a5fa" stroke-width="2" stroke-linejoin="round"/>
            <!-- Data points -->
            {% for entry in savings_history %}
            {% set cx = (loop.index0 * step) | int %}
            {% set cy = (chart_h - ((entry.savings_rate_pct - min_rate) / range_rate * chart_h)) | int %}
            <circle cx="{{ cx }}" cy="{{ cy }}" r="3"
                fill="{% if entry.savings_rate_pct >= 30 %}#4ade80{% elif entry.savings_rate_pct >= 20 %}#60a5fa{% elif entry.savings_rate_pct > 0 %}#facc15{% else %}#f87171{% endif %}"/>
            {% endfor %}
            <!-- X-axis labels (first, mid, last) -->
            <text x="0" y="{{ chart_h + 14 }}" font-size="9" fill="#6b7280">{{ savings_history[0].label }}</text>
            {% if n > 2 %}
            {% set mid_i = (n // 2) %}
            <text x="{{ (mid_i * step) | int }}" y="{{ chart_h + 14 }}" font-size="9" fill="#6b7280" text-anchor="middle">{{ savings_history[mid_i].label }}</text>
            {% endif %}
            <text x="{{ chart_w }}" y="{{ chart_h + 14 }}" font-size="9" fill="#6b7280" text-anchor="end">{{ savings_history[-1].label }}</text>
        </svg>
    </div>
    {% endif %}

    <!-- ===== MONTHLY TABLE ===== -->
    <div class="card-v3">
        <div class="card-title-v3">Monthly Breakdown</div>
        <table class="ins-table">
            <thead>
                <tr>
                    <th>Month</th>
                    <th class="num">Income</th>
                    <th class="num">Saved</th>
                    <th class="num">Rate</th>
                </tr>
            </thead>
            <tbody>
            {% for entry in savings_history | reverse %}
            <tr>
                <td>{{ entry.label }}</td>
                <td class="num">${{ "%.0f"|format(entry.income_cents / 100) }}</td>
                <td class="num {% if entry.net_cents < 0 %}neg{% elif entry.net_cents > 0 %}pos{% endif %}">
                    {% if entry.net_cents >= 0 %}${{ "%.0f"|format(entry.net_cents / 100) }}{% else %}−${{ "%.0f"|format((entry.net_cents * -1) / 100) }}{% endif %}
                </td>
                <td class="num {% if entry.savings_rate_pct >= 20 %}pos{% elif entry.savings_rate_pct < 0 %}neg{% endif %}">
                    {{ "%.1f"|format(entry.savings_rate_pct) }}%
                </td>
            </tr>
            {% endfor %}
            </tbody>
        </table>
    </div>

    {% endif %}
</div>

<style>
.ins-page { max-width: 700px; margin: 0 auto; padding: 24px 16px; }
.ins-title { font-size: 1.25rem; font-weight: 600; margin-bottom: 20px; color: var(--text-primary); }

.ins-summary {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 12px;
    margin-bottom: 16px;
}
.ins-metric-card {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 16px;
}
.ins-metric-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 4px;
}
.ins-metric-value {
    font-size: 1.5rem;
    font-weight: 600;
    font-family: var(--font-mono);
    color: var(--text-primary);
}
.ins-metric-sub {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 2px;
}
.ins-stability-stable   { color: #4ade80; }
.ins-stability-moderate { color: #facc15; }
.ins-stability-variable { color: #f87171; }

.ins-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.8125rem;
}
.ins-table th {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-muted);
    padding: 6px 8px;
    border-bottom: 1px solid var(--border-color);
    font-weight: 500;
    text-align: left;
}
.ins-table td {
    padding: 7px 8px;
    border-bottom: 1px solid var(--border-color);
    color: var(--text-primary);
}
.ins-table tr:last-child td { border-bottom: none; }
.ins-table .num { text-align: right; font-family: var(--font-mono); }
.ins-table .pos { color: #4ade80; }
.ins-table .neg { color: #f87171; }
</style>
{% endblock %}