<?php

declare(strict_types=1);

namespace Monitor\Api\Repository;

use InvalidArgumentException;
use Monitor\Api\Db\Database;
use Monitor\Api\Http\NotFoundException;

/**
 * Verwaltet die Codeberg-Projekte, aus denen CodebergSyncService liest (Issue #27: vorher
 * CODEBERG_REPOS-Umgebungsvariable, siehe 003_repo_configs.sql). Der Sync-Dauerlaeufer ruft
 * all() bei jedem Lauf frisch ab, damit eine Aenderung ueber das Frontend-Modal ohne
 * Neustart des sync-Containers wirkt.
 */
final class RepoConfigRepository
{
    public function __construct(private readonly Database $db)
    {
    }

    /** @return array<int, array{owner: string, repo: string, color: string}> */
    public function all(): array
    {
        $stmt = $this->db->pdo()->query('SELECT * FROM repo_configs ORDER BY sort_order ASC, id ASC');

        return $stmt->fetchAll();
    }

    /** @return array<string, mixed>|null */
    public function find(int $id): ?array
    {
        $stmt = $this->db->pdo()->prepare('SELECT * FROM repo_configs WHERE id = :id');
        $stmt->execute(['id' => $id]);
        $row = $stmt->fetch();

        return $row === false ? null : $row;
    }

    /** @param array<string, mixed> $data @return array<string, mixed> */
    public function create(array $data): array
    {
        [$owner, $repo, $color] = $this->validate($data, null);
        $now = $this->db->now();

        $stmt = $this->db->pdo()->prepare(
            'INSERT INTO repo_configs (owner, repo, color, sort_order, created_at, updated_at)
             VALUES (:owner, :repo, :color, :sort_order, :created_at, :updated_at)'
        );
        $stmt->execute([
            'owner' => $owner,
            'repo' => $repo,
            'color' => $color,
            'sort_order' => $this->nextSortOrder(),
            'created_at' => $now,
            'updated_at' => $now,
        ]);

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

    /** @param array<string, mixed> $data @return array<string, mixed> */
    public function update(int $id, array $data): array
    {
        if ($this->find($id) === null) {
            throw new NotFoundException('Projekt nicht gefunden: ' . $id);
        }

        [$owner, $repo, $color] = $this->validate($data, $id);

        $stmt = $this->db->pdo()->prepare(
            'UPDATE repo_configs SET owner = :owner, repo = :repo, color = :color, updated_at = :updated_at
             WHERE id = :id'
        );
        $stmt->execute([
            'id' => $id,
            'owner' => $owner,
            'repo' => $repo,
            'color' => $color,
            'updated_at' => $this->db->now(),
        ]);

        return $this->find($id);
    }

    public function delete(int $id): void
    {
        if ($this->find($id) === null) {
            throw new NotFoundException('Projekt nicht gefunden: ' . $id);
        }

        $stmt = $this->db->pdo()->prepare('DELETE FROM repo_configs WHERE id = :id');
        $stmt->execute(['id' => $id]);
    }

    /**
     * Prueft Pflichtfelder + Farbformat vorab, statt eine Verletzung der UNIQUE-Constraint
     * (owner, repo) als PDOException auflaufen zu lassen (Konvention wie
     * AgentRepository::updateActivity() fuer das Fremdschluessel-Pendant bei Tickets).
     *
     * @param array<string, mixed> $data
     * @param int|null $excludeId - beim Update die eigene Zeile von der Duplikatspruefung ausnehmen.
     * @return array{0: string, 1: string, 2: string}
     */
    private function validate(array $data, ?int $excludeId): array
    {
        $owner = trim((string) ($data['owner'] ?? ''));
        $repo = trim((string) ($data['repo'] ?? ''));
        $color = $data['color'] ?? null;

        if ($owner === '' || $repo === '') {
            throw new InvalidArgumentException('Felder "owner" und "repo" sind erforderlich.');
        }

        if (!is_string($color) || !preg_match('/^#?[0-9a-fA-F]{6}$/', $color)) {
            throw new InvalidArgumentException('Feld "color" muss ein 6-stelliger Hex-Farbwert sein (z. B. "#fbca04").');
        }

        if ($this->existsWithOwnerRepo($owner, $repo, $excludeId)) {
            throw new InvalidArgumentException(sprintf('Projekt "%s/%s" ist bereits konfiguriert.', $owner, $repo));
        }

        return [$owner, $repo, '#' . ltrim($color, '#')];
    }

    private function existsWithOwnerRepo(string $owner, string $repo, ?int $excludeId): bool
    {
        $sql = 'SELECT COUNT(*) FROM repo_configs WHERE owner = :owner AND repo = :repo';
        $params = ['owner' => $owner, 'repo' => $repo];
        if ($excludeId !== null) {
            $sql .= ' AND id != :exclude_id';
            $params['exclude_id'] = $excludeId;
        }

        $stmt = $this->db->pdo()->prepare($sql);
        $stmt->execute($params);

        return ((int) $stmt->fetchColumn()) > 0;
    }

    private function nextSortOrder(): int
    {
        $row = $this->db->pdo()->query('SELECT COALESCE(MAX(sort_order), -1) + 1 AS next FROM repo_configs')->fetch();

        return (int) $row['next'];
    }
}