<?php

class ProgrammeService
{
    private string $timezone;

    public function __construct(string $timezone = 'Europe/Vienna')
    {
        $this->timezone = $timezone;
    }

    public function load(array $data, ?Config $config = null): array
    {
        $channelConfig = $config ? $config->getChannels() : [];
        $channels = [];
        $programmes = [];

        foreach ($data['channels'] ?? [] as $id => $channel) {
            $cfg = $channelConfig[$id] ?? [];

            if (($cfg['enabled'] ?? true) !== true) {
                continue;
            }

            $channels[$id] = [
                'id' => $id,
                'name' => $cfg['name'] ?? $channel['name'] ?? $id,
                'icon' => $cfg['icon'] ?? $channel['icon'] ?? '',
                'number' => (int)($cfg['number'] ?? 999999),
                'favorite' => (bool)($cfg['favorite'] ?? false),
            ];

            foreach ($channel['programmes'] ?? [] as $p) {
                $programmes[$id][] = [
                    'title' => $p['title'] ?? '',
                    'desc' => $p['description'] ?? '',
                    'category' => $p['category'] ?? '',
                    'metadata' => $p['metadata'] ?? [],
                    'start' => (new DateTime())->setTimestamp((int)$p['start'])->setTimezone(new DateTimeZone($this->timezone)),
                    'stop' => (new DateTime())->setTimestamp((int)$p['stop'])->setTimezone(new DateTimeZone($this->timezone)),
                ];
            }
        }

        uasort($channels, function ($a, $b) {
            return ($a['number'] ?? 999999) <=> ($b['number'] ?? 999999);
        });

        return [$channels, $programmes];
    }

    public function getCurrentProgrammes(array $data, ?Config $config = null): array
    {
        $channelConfig = $config ? $config->getChannels() : [];
        $now = time();
        $items = [];

        foreach ($data['channels'] ?? [] as $id => $channel) {
            $cfg = $channelConfig[$id] ?? [];

            if (($cfg['enabled'] ?? true) !== true) {
                continue;
            }

            $programmes = $channel['programmes'] ?? [];

            usort($programmes, function ($a, $b) {
                return ((int)($a['start'] ?? 0)) <=> ((int)($b['start'] ?? 0));
            });

            foreach ($programmes as $index => $p) {
                $start = (int)($p['start'] ?? 0);
                $stop = (int)($p['stop'] ?? 0);

                if ($now >= $start && $now < $stop) {
                    $duration = max(1, $stop - $start);
                    $elapsed = max(0, $now - $start);
                    $percent = min(100, round(($elapsed / $duration) * 100));

                    $next = $programmes[$index + 1] ?? null;

                    $items[] = [
                        'channel_id' => $id,
                        'channel_name' => $cfg['name'] ?? $channel['name'] ?? $id,
                        'channel_icon' => $cfg['icon'] ?? $channel['icon'] ?? '',
                        'channel_number' => (int)($cfg['number'] ?? 999999),
                        'favorite' => (bool)($cfg['favorite'] ?? false),

                        'title' => $p['title'] ?? '',
                        'subtitle' => $p['subtitle'] ?? '',
                        'description' => $p['description'] ?? '',
                        'category' => $p['category'] ?? '',
                        'genre_icon' => $this->getGenreIcon($p['category'] ?? ''),
                        'metadata' => $p['metadata'] ?? [],
                        'year' => $p['year'] ?? '',
                        'rating' => $p['rating'] ?? '',
                        'episode' => $p['episode'] ?? '',
                        'quality' => $this->detectQuality($p),

                        'start' => $start,
                        'stop' => $stop,
                        'percent' => $percent,
                        'remaining_minutes' => max(0, (int)ceil(($stop - $now) / 60)),

                        'next_title' => $next['title'] ?? '',
                        'next_subtitle' => $next['subtitle'] ?? '',
                        'next_start' => isset($next['start']) ? (int)$next['start'] : null,
                        'next_stop' => isset($next['stop']) ? (int)$next['stop'] : null,
                        'next_category' => $next['category'] ?? '',
                    ];

                    break;
                }
            }
        }

        usort($items, function ($a, $b) {
            return $a['channel_number'] <=> $b['channel_number'];
        });

        return $items;
    }

    public function getDayProgrammes(Config $config, array $data, string $date, ?string $channelId = null): array
    {
        $channelConfig = $config->getChannels();

        $tz = new DateTimeZone($this->timezone);
        $dayStart = new DateTime($date . ' 00:00:00', $tz);
        $dayEnd = clone $dayStart;
        $dayEnd->modify('+1 day');

        $startTs = $dayStart->getTimestamp();
        $endTs = $dayEnd->getTimestamp();

        $items = [];

        foreach ($data['channels'] ?? [] as $id => $channel) {
            if ($channelId !== null && $id !== $channelId) {
                continue;
            }

            $cfg = $channelConfig[$id] ?? [];

            if (($cfg['enabled'] ?? true) !== true) {
                continue;
            }

            $programmes = [];

            foreach ($channel['programmes'] ?? [] as $p) {
                $start = (int)($p['start'] ?? 0);
                $stop = (int)($p['stop'] ?? 0);

                if ($start < $endTs && $stop > $startTs) {
                    $visibleStart = max($start, $startTs);
                    $visibleStop = min($stop, $endTs);

                    $startDt = (new DateTime())->setTimestamp($visibleStart)->setTimezone($tz);
                    $stopDt = (new DateTime())->setTimestamp($visibleStop)->setTimezone($tz);

                    $startMinute = ((int)$startDt->format('H') * 60) + (int)$startDt->format('i');
                    $stopMinute = ((int)$stopDt->format('H') * 60) + (int)$stopDt->format('i');

                    if ($visibleStop >= $endTs) {
                        $stopMinute = 1440;
                    }

                    $durationMinutes = max(1, (int)(($visibleStop - $visibleStart) / 60));

                    $programmes[] = [
                        'id' => md5($id . '|' . $start . '|' . $stop . '|' . ($p['title'] ?? '')),
                        'title' => $p['title'] ?? '',
                        'subtitle' => $p['subtitle'] ?? '',
                        'description' => $p['description'] ?? '',
                        'category' => $p['category'] ?? '',
                        'metadata' => $p['metadata'] ?? [],
                        'start' => $start,
                        'stop' => $stop,
                        'visible_start' => $visibleStart,
                        'visible_stop' => $visibleStop,
                        'start_minute' => $startMinute,
                        'stop_minute' => $stopMinute,
                        'duration_minutes' => $durationMinutes,
                        'is_current' => time() >= $start && time() < $stop,
                        'is_past' => $stop < time(),
                    ];
                }
            }

            if (!$programmes) {
                continue;
            }

            usort($programmes, function ($a, $b) {
                return $a['start'] <=> $b['start'];
            });

            $items[] = [
                'channel_id' => $id,
                'channel_name' => $cfg['name'] ?? $channel['name'] ?? $id,
                'channel_icon' => $cfg['icon'] ?? $channel['icon'] ?? '',
                'channel_number' => (int)($cfg['number'] ?? 999999),
                'favorite' => (bool)($cfg['favorite'] ?? false),
                'programmes' => $programmes,
            ];
        }

        usort($items, function ($a, $b) {
            return $a['channel_number'] <=> $b['channel_number'];
        });

        return $items;
    }

    public function search(
        Config $config,
        array $data,
        string $query,
        int $limit = 20
    ): array {
        $query = trim($query);
        $limit = max(1, min(50, $limit));
    
        if (mb_strlen($query) < 2) {
            return [];
        }
    
        $channelConfig = $config->getChannels();
        $tz = new DateTimeZone($this->timezone);
    
        $dayStart = new DateTime('today', $tz);
        $dayEnd = clone $dayStart;
        $dayEnd->modify('+1 day');
    
        $startTs = $dayStart->getTimestamp();
        $endTs = $dayEnd->getTimestamp();
    
        $channelResults = [];
        $programmeResults = [];
    
        foreach ($data['channels'] ?? [] as $channelId => $channel) {
            $cfg = $channelConfig[$channelId] ?? [];
    
            if (($cfg['enabled'] ?? true) !== true) {
                continue;
            }
    
            $channelName = $cfg['name'] ?? $channel['name'] ?? $channelId;
            $channelNumber = (int)($cfg['number'] ?? 999999);
            $channelIcon = $cfg['icon'] ?? $channel['icon'] ?? '';
            $favorite = (bool)($cfg['favorite'] ?? false);
    
            if (mb_stripos($channelName, $query) !== false) {
                $channelResults[] = [
                    'type' => 'channel',
                    'channel_id' => $channelId,
                    'channel_name' => $channelName,
                    'channel_number' => $channelNumber,
                    'channel_icon' => $channelIcon,
                    'favorite' => $favorite,
                ];
            }
    
            foreach ($channel['programmes'] ?? [] as $programme) {
                $start = (int)($programme['start'] ?? 0);
                $stop = (int)($programme['stop'] ?? 0);
    
                // Nur Sendungen, die den heutigen Tag berühren
                if ($start >= $endTs || $stop <= $startTs) {
                    continue;
                }
    
                $title = trim((string)($programme['title'] ?? ''));
                $subtitle = trim((string)($programme['subtitle'] ?? ''));
    
                $matches =
                    mb_stripos($title, $query) !== false ||
                    mb_stripos($subtitle, $query) !== false;
    
                if (!$matches) {
                    continue;
                }
    
                $startDateTime = (new DateTime())
                    ->setTimestamp($start)
                    ->setTimezone($tz);
    
                $stopDateTime = (new DateTime())
                    ->setTimestamp($stop)
                    ->setTimezone($tz);
    
                $programmeResults[] = [
                    'type' => 'programme',
                    'id' => md5(
                        $channelId . '|' .
                        $start . '|' .
                        $stop . '|' .
                        $title
                    ),
    
                    'channel_id' => $channelId,
                    'channel_name' => $channelName,
                    'channel_number' => $channelNumber,
                    'channel_icon' => $channelIcon,
                    'favorite' => $favorite,
    
                    'title' => $title,
                    'subtitle' => $subtitle,
                    'description' => $programme['description'] ?? '',
                    'category' => $programme['category'] ?? '',
                    'metadata' => $programme['metadata'] ?? [],
                    'year' => $programme['year'] ?? '',
                    'rating' => $programme['rating'] ?? '',
                    'episode' => $programme['episode'] ?? '',
                    'icon' => $programme['icon'] ?? '',
    
                    'start' => $start,
                    'stop' => $stop,
                    'start_time' => $startDateTime->format('H:i'),
                    'stop_time' => $stopDateTime->format('H:i'),
                    'date' => $startDateTime->format('Y-m-d'),
                    'is_current' => time() >= $start && time() < $stop,
                    'is_past' => $stop <= time(),
                ];
            }
        }
    
        usort($channelResults, function (array $a, array $b): int {
            return [
                $a['channel_number'],
                mb_strtolower($a['channel_name']),
            ] <=> [
                $b['channel_number'],
                mb_strtolower($b['channel_name']),
            ];
        });
    
        usort($programmeResults, function (array $a, array $b): int {
            return [
                $a['start'],
                $a['channel_number'],
            ] <=> [
                $b['start'],
                $b['channel_number'],
            ];
        });
    
        return array_slice(
            array_merge($channelResults, $programmeResults),
            0,
            $limit
        );
    }

    private function getGenreIcon(string $category): string
    {
        $category = mb_strtolower($category);

        return match (true) {
            str_contains($category, 'film'),
            str_contains($category, 'movie'),
            str_contains($category, 'kino') => '🎬',

            str_contains($category, 'serie'),
            str_contains($category, 'series') => '📺',

            str_contains($category, 'sport'),
            str_contains($category, 'football'),
            str_contains($category, 'fußball'),
            str_contains($category, 'fussball') => '⚽',

            str_contains($category, 'news'),
            str_contains($category, 'nachrichten'),
            str_contains($category, 'journal') => '📰',

            str_contains($category, 'doku'),
            str_contains($category, 'documentary') => '🌍',

            str_contains($category, 'kinder'),
            str_contains($category, 'kids'),
            str_contains($category, 'children') => '🧸',

            str_contains($category, 'musik'),
            str_contains($category, 'music') => '🎵',

            default => '▶',
        };
    }

    private function detectQuality(array $programme): string
    {
        $text = mb_strtolower(
            ($programme['title'] ?? '') . ' ' .
            ($programme['subtitle'] ?? '') . ' ' .
            ($programme['description'] ?? '')
        );

        return match (true) {
            str_contains($text, 'uhd'),
            str_contains($text, '4k') => 'UHD',

            str_contains($text, 'hd') => 'HD',

            default => '',
        };
    }
}