<?php
// JARVIS Directives — OKR / mission goal tracking
// Actions: list | get | save | delete | key_result_update | link | unlink | review

switch ($action) {

    // GET directives/list  — all active directives with key results + progress
    case 'list':
        $status   = $_GET['status'] ?? 'active';
        $category = $_GET['category'] ?? '';
        $where    = '1=1';
        $params   = [];
        if ($status && $status !== 'all') { $where .= ' AND d.status=?';   $params[] = $status; }
        if ($category)                    { $where .= ' AND d.category=?'; $params[] = $category; }
        $rows = JarvisDB::query(
            "SELECT d.*,
                    COUNT(kr.id)                                          AS kr_count,
                    COALESCE(SUM(kr.current_value),0)                    AS kr_current_sum,
                    COALESCE(SUM(kr.target_value),0)                     AS kr_target_sum,
                    (SELECT COUNT(*) FROM directive_links dl WHERE dl.directive_id=d.id) AS link_count
             FROM directives d
             LEFT JOIN directive_key_results kr ON kr.directive_id=d.id
             WHERE {$where}
             GROUP BY d.id
             ORDER BY d.priority DESC, d.target_date ASC, d.created_at DESC",
            $params
        ) ?: [];
        // Compute progress pct per directive
        foreach ($rows as &$r) {
            $r['progress'] = ($r['kr_target_sum'] > 0)
                ? (float)round($r['kr_current_sum'] / $r['kr_target_sum'] * 100, 1)
                : 0;
        }
        unset($r);
        echo json_encode(['directives' => $rows]);
        break;

    // GET directives/get?id=X — full directive with key results and links
    case 'get':
        $id = (int)($_GET['id'] ?? 0);
        if (!$id) { echo json_encode(['error' => 'Missing id']); break; }
        $d = JarvisDB::single("SELECT * FROM directives WHERE id=?", [$id]);
        if (!$d)  { echo json_encode(['error' => 'Not found']); break; }
        $krs   = JarvisDB::query("SELECT * FROM directive_key_results WHERE directive_id=? ORDER BY id ASC", [$id]) ?: [];
        $links = JarvisDB::query(
            "SELECT dl.*, t.title AS task_title, a.title AS appt_title
             FROM directive_links dl
             LEFT JOIN tasks t ON dl.link_type='task' AND t.id=dl.link_id
             LEFT JOIN appointments a ON dl.link_type='appointment' AND a.id=dl.link_id
             WHERE dl.directive_id=?
             ORDER BY dl.created_at DESC",
            [$id]
        ) ?: [];
        $sum_cur = array_sum(array_column($krs, 'current_value'));
        $sum_tgt = array_sum(array_column($krs, 'target_value'));
        $d['progress']    = ($sum_tgt > 0) ? round($sum_cur / $sum_tgt * 100, 1) : 0;
        $d['key_results'] = $krs;
        $d['links']       = $links;
        echo json_encode($d);
        break;

    // POST directives/save — create or update directive + key results
    case 'save':
        $id          = (int)($data['id'] ?? 0);
        $title       = trim($data['title'] ?? '');
        $description = trim($data['description'] ?? '');
        $category    = $data['category'] ?? 'work';
        $status      = $data['status'] ?? 'active';
        $priority    = (int)($data['priority'] ?? 5);
        $target_date = !empty($data['target_date']) ? $data['target_date'] : null;
        if (!$title) { echo json_encode(['error' => 'Title required']); break; }
        if ($id) {
            JarvisDB::execute(
                "UPDATE directives SET title=?,description=?,category=?,status=?,priority=?,target_date=?,updated_at=NOW() WHERE id=?",
                [$title,$description,$category,$status,$priority,$target_date,$id]
            );
        } else {
            $id = JarvisDB::insert(
                "INSERT INTO directives (title,description,category,status,priority,target_date) VALUES (?,?,?,?,?,?)",
                [$title,$description,$category,$status,$priority,$target_date]
            );
        }
        // Replace key results if provided
        if (isset($data['key_results']) && is_array($data['key_results'])) {
            JarvisDB::execute("DELETE FROM directive_key_results WHERE directive_id=?", [$id]);
            foreach ($data['key_results'] as $kr) {
                $krtitle = trim($kr['title'] ?? ''); if (!$krtitle) continue;
                JarvisDB::execute(
                    "INSERT INTO directive_key_results (directive_id,title,current_value,target_value,unit) VALUES (?,?,?,?,?)",
                    [$id, $krtitle, (float)($kr['current_value']??0), (float)($kr['target_value']??100), $kr['unit']??'%']
                );
            }
        }
        echo json_encode(['ok' => true, 'id' => $id]);
        break;

    // POST directives/delete?id=X
    case 'delete':
        $id = (int)($_GET['id'] ?? $data['id'] ?? 0);
        if (!$id) { echo json_encode(['error' => 'Missing id']); break; }
        JarvisDB::execute("DELETE FROM directive_key_results WHERE directive_id=?", [$id]);
        JarvisDB::execute("DELETE FROM directive_links WHERE directive_id=?", [$id]);
        JarvisDB::execute("DELETE FROM directives WHERE id=?", [$id]);
        echo json_encode(['ok' => true]);
        break;

    // POST directives/key_result_update — update a single KR's current value
    case 'key_result_update':
        $krid  = (int)($data['id'] ?? 0);
        $value = (float)($data['current_value'] ?? 0);
        if (!$krid) { echo json_encode(['error' => 'Missing kr id']); break; }
        JarvisDB::execute(
            "UPDATE directive_key_results SET current_value=?, updated_at=NOW() WHERE id=?",
            [$value, $krid]
        );
        echo json_encode(['ok' => true]);
        break;

    // POST directives/link — link a task or appointment to a directive
    case 'link':
        $did       = (int)($data['directive_id'] ?? 0);
        $link_type = $data['link_type'] ?? 'task';
        $link_id   = (int)($data['link_id'] ?? 0);
        $note      = trim($data['note'] ?? '');
        if (!$did) { echo json_encode(['error' => 'Missing directive_id']); break; }
        JarvisDB::execute(
            "INSERT INTO directive_links (directive_id,link_type,link_id,note) VALUES (?,?,?,?)",
            [$did, $link_type, $link_id ?: null, $note]
        );
        echo json_encode(['ok' => true]);
        break;

    // POST directives/unlink?id=X — remove a link
    case 'unlink':
        $lid = (int)($_GET['id'] ?? $data['id'] ?? 0);
        if (!$lid) { echo json_encode(['error' => 'Missing id']); break; }
        JarvisDB::execute("DELETE FROM directive_links WHERE id=?", [$lid]);
        echo json_encode(['ok' => true]);
        break;

    // GET directives/summary — compact progress snapshot for chat/briefing injection
    case 'summary':
        $rows = JarvisDB::query(
            "SELECT d.id, d.title, d.category, d.target_date,
                    COALESCE(SUM(kr.current_value),0) AS kr_cur,
                    COALESCE(SUM(kr.target_value),1)  AS kr_tgt
             FROM directives d
             LEFT JOIN directive_key_results kr ON kr.directive_id=d.id
             WHERE d.status='active'
             GROUP BY d.id
             ORDER BY d.priority DESC, d.target_date ASC
             LIMIT 10"
        ) ?: [];
        $summary = [];
        foreach ($rows as $r) {
            $pct = round($r['kr_cur'] / max($r['kr_tgt'], 1) * 100, 0);
            $summary[] = [
                'id'          => $r['id'],
                'title'       => $r['title'],
                'category'    => $r['category'],
                'target_date' => $r['target_date'],
                'progress'    => $pct,
            ];
        }
        echo json_encode(['directives' => $summary]);
        break;

    default:
        http_response_code(404);
        echo json_encode(['error' => "Unknown directives action: {$action}"]);
}