<?php

declare(strict_types=1);

namespace App\Repositories;

use Core\Database;

class TaskRepository
{
    public function __construct(protected ?Database $database = null)
    {
        $this->database ??= database();
    }

    public function create(int $projectId, array $data): int
    {
        $position = (int) ($this->database->first(
            'SELECT COALESCE(MAX(position), 0) + 1 AS next_position FROM tasks WHERE project_id = :project_id AND status = :status',
            [
                'project_id' => $projectId,
                'status' => $data['status'] ?? 'backlog',
            ]
        )['next_position'] ?? 1);

        $this->database->execute(
            'INSERT INTO tasks (
                project_id, title, description, status, priority, assignee, estimate_hours, due_date, position, completed_at
             ) VALUES (
                :project_id, :title, :description, :status, :priority, :assignee, :estimate_hours, :due_date, :position, :completed_at
             )',
            [
                'project_id' => $projectId,
                'title' => $data['title'],
                'description' => $data['description'] ?? '',
                'status' => $data['status'] ?? 'backlog',
                'priority' => $data['priority'] ?? 'normal',
                'assignee' => $data['assignee'] ?? '',
                'estimate_hours' => $data['estimate_hours'] ?? null,
                'due_date' => $data['due_date'] ?? null,
                'position' => $position,
                'completed_at' => ($data['status'] ?? 'backlog') === 'done' ? date('Y-m-d H:i:s') : null,
            ]
        );

        return (int) $this->database->pdo()->lastInsertId();
    }

    public function updateStatus(int $taskId, string $status): ?int
    {
        $task = $this->database->first('SELECT id, project_id, title, status FROM tasks WHERE id = :id', ['id' => $taskId]);

        if ($task === null) {
            return null;
        }

        $completedAt = $status === 'done' ? date('Y-m-d H:i:s') : null;

        $this->database->execute(
            'UPDATE tasks
             SET status = :status,
                 completed_at = :completed_at,
                 updated_at = CURRENT_TIMESTAMP
             WHERE id = :id',
            [
                'status' => $status,
                'completed_at' => $completedAt,
                'id' => $taskId,
            ]
        );

        return (int) $task['project_id'];
    }

    public function dueSoon(int $limit = 6): array
    {
        $limit = max(1, min(25, $limit));

        return $this->database->query(
            'SELECT t.*, p.name AS project_name, p.code AS project_code
             FROM tasks t
             INNER JOIN projects p ON p.id = t.project_id
             WHERE t.status != "done"
               AND t.due_date IS NOT NULL
               AND date(t.due_date) BETWEEN date("now") AND date("now", "+7 day")
             ORDER BY date(t.due_date) ASC, CASE t.priority WHEN "urgent" THEN 0 WHEN "high" THEN 1 WHEN "normal" THEN 2 ELSE 3 END, t.id DESC
             LIMIT ' . $limit
        );
    }

    public function overdue(int $limit = 6): array
    {
        $limit = max(1, min(25, $limit));

        return $this->database->query(
            'SELECT t.*, p.name AS project_name, p.code AS project_code
             FROM tasks t
             INNER JOIN projects p ON p.id = t.project_id
             WHERE t.status != "done"
               AND t.due_date IS NOT NULL
               AND date(t.due_date) < date("now")
             ORDER BY date(t.due_date) ASC, t.id DESC
             LIMIT ' . $limit
        );
    }

    public function countsByStatus(int $projectId): array
    {
        $rows = $this->database->query(
            'SELECT status, COUNT(*) AS total
             FROM tasks
             WHERE project_id = :project_id
             GROUP BY status',
            ['project_id' => $projectId]
        );

        $counts = [];
        foreach ($rows as $row) {
            $counts[$row['status']] = (int) $row['total'];
        }

        return $counts;
    }

    public function forProject(int $projectId): array
    {
        return $this->database->query(
            'SELECT *
             FROM tasks
             WHERE project_id = :project_id
             ORDER BY
                CASE status
                    WHEN "backlog" THEN 0
                    WHEN "in-progress" THEN 1
                    WHEN "review" THEN 2
                    WHEN "blocked" THEN 3
                    WHEN "done" THEN 4
                    ELSE 5
                END,
                CASE priority
                    WHEN "urgent" THEN 0
                    WHEN "high" THEN 1
                    WHEN "normal" THEN 2
                    ELSE 3
                END,
                due_date IS NULL,
                due_date ASC,
                position ASC,
                id ASC',
            ['project_id' => $projectId]
        );
    }
}