<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Attributes\Fillable;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\BelongsToMany;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Support\Carbon;
use Illuminate\Support\Facades\DB;

#[Fillable([
    'number', 'customer_id', 'email', 'name', 'subcategory_id', 'subject', 'body',
    'status_key', 'priority_key', 'team_id', 'assignee_id', 'custom_fields', 'api_client_id',
    'sla_notified_at', 'last_customer_activity_at', 'time_spent_seconds', 'timer_started_at',
    'created_at', 'updated_at', 'csat_rating', 'csat_comment', 'csat_rated_at',
])]
class Ticket extends Model
{
    protected function casts(): array
    {
        return [
            'custom_fields' => 'array',
            'sla_notified_at' => 'datetime',
            'last_customer_activity_at' => 'datetime',
            'time_spent_seconds' => 'integer',
            'timer_started_at' => 'datetime',
            'csat_rating' => 'integer',
            'csat_rated_at' => 'datetime',
        ];
    }

    public function customer(): BelongsTo
    {
        return $this->belongsTo(User::class, 'customer_id');
    }

    public function assignee(): BelongsTo
    {
        return $this->belongsTo(User::class, 'assignee_id');
    }

    public function team(): BelongsTo
    {
        return $this->belongsTo(Team::class);
    }

    public function apiClient(): BelongsTo
    {
        return $this->belongsTo(ApiClient::class);
    }

    public function subcategory(): BelongsTo
    {
        return $this->belongsTo(Subcategory::class);
    }

    public function watchers(): BelongsToMany
    {
        return $this->belongsToMany(User::class, 'ticket_watchers');
    }

    public function isWatchedBy(User $user): bool
    {
        return $this->watchers()->where('users.id', $user->id)->exists();
    }

    public function status(): BelongsTo
    {
        return $this->belongsTo(Status::class, 'status_key');
    }

    public function priority(): BelongsTo
    {
        return $this->belongsTo(Priority::class, 'priority_key');
    }

    public function messages(): HasMany
    {
        return $this->hasMany(TicketMessage::class)->orderBy('created_at');
    }

    public function publicMessages(): HasMany
    {
        return $this->messages()->where('internal', false);
    }

    public function internalMessages(): HasMany
    {
        return $this->messages()->where('internal', true);
    }

    public function attachments(): HasMany
    {
        return $this->hasMany(TicketAttachment::class);
    }

    public function histories(): HasMany
    {
        return $this->hasMany(TicketHistory::class)->orderByDesc('created_at');
    }

    public function automationRuleLogs(): HasMany
    {
        return $this->hasMany(AutomationRuleTicketLog::class);
    }

    public static function nextNumber(): string
    {
        $max = static::query()->pluck('number')->map(fn ($n) => (int) $n)->max();

        return (string) (($max ?: 1000) + 1);
    }

    public function categoryLabel(): string
    {
        return $this->subcategory?->label() ?? '';
    }

    /**
     * Non-admin operators only see tickets belonging to one of their own
     * teams (or not yet routed to any team), plus anything assigned to them
     * personally regardless of team. Admins see everything.
     */
    public function scopeVisibleToOperator(Builder $query, User $user): Builder
    {
        if ($user->isAdmin()) {
            return $query;
        }

        $teamIds = $user->teams->pluck('id')->all();

        return $query->where(function ($q) use ($teamIds, $user) {
            $q->whereNull('team_id')
                ->orWhereIn('team_id', $teamIds)
                ->orWhere('assignee_id', $user->id);
        });
    }

    public function isVisibleToOperator(User $user): bool
    {
        if ($user->isAdmin()) {
            return true;
        }

        return $this->team_id === null
            || $user->teams->pluck('id')->contains($this->team_id)
            || $this->assignee_id === $user->id;
    }

    /**
     * Matches ticket number/subject/name/email plus subject/body and reply
     * body text. Uses MySQL FULLTEXT (natural-language mode) on MySQL/MariaDB
     * — matching the indexes added in the 2026_07_22_000141 migration — and
     * falls back to plain LIKE on sqlite (used by the test suite), which has
     * no FULLTEXT equivalent.
     */
    public function scopeSearch(Builder $query, string $term): Builder
    {
        $term = trim($term);

        if ($term === '') {
            return $query;
        }

        $mysql = DB::connection()->getDriverName() === 'mysql';
        $like = '%'.$term.'%';

        $messageTicketIds = DB::table('ticket_messages')
            ->when(
                $mysql,
                fn ($q) => $q->whereFullText('body', $term),
                fn ($q) => $q->where('body', 'like', $like),
            )
            ->pluck('ticket_id');

        return $query->where(function (Builder $q) use ($term, $like, $mysql, $messageTicketIds) {
            if ($mysql) {
                $q->whereFullText(['subject', 'body'], $term);
            } else {
                $q->where('subject', 'like', $like)->orWhere('body', 'like', $like);
            }

            $q->orWhere('number', 'like', $like)
                ->orWhere('name', 'like', $like)
                ->orWhere('email', 'like', $like)
                ->orWhereIn('id', $messageTicketIds);
        });
    }

    public function addHistory(string $text): TicketHistory
    {
        return $this->histories()->create(['text' => $text, 'created_at' => now()]);
    }

    public function statusLabel(): string
    {
        return Status::labelFor($this->status_key);
    }

    public function priorityLabel(): string
    {
        return Priority::labelFor($this->priority_key);
    }

    public function statusStyle(): string
    {
        return static::tagStyleFromColor(Status::colorFor($this->status_key));
    }

    public function priorityStyle(): string
    {
        return static::tagStyleFromColor(Priority::colorFor($this->priority_key));
    }

    public static function tagStyleFromColor(string $hex): string
    {
        return 'display:inline-flex;align-items:center;font-size:11px;letter-spacing:0.02em;padding:3px 10px;border-radius:6px;'.
            "background:color-mix(in srgb, {$hex} 20%, transparent);color:{$hex};".
            "border:1px solid color-mix(in srgb, {$hex} 45%, transparent)";
    }

    public function isClosed(): bool
    {
        return Status::stageFor($this->status_key) === 'closed';
    }

    public function hasCsatRating(): bool
    {
        return $this->csat_rating !== null;
    }

    /**
     * A client can rate a ticket once it's closed, and only until they do —
     * there's no "change your rating" flow, mirroring how e.g. edit-message
     * doesn't apply once the underlying thing is done.
     */
    public function csatSubmittable(): bool
    {
        return $this->isClosed() && ! $this->hasCsatRating();
    }

    /**
     * A resolution time of 0 minutes means "no SLA" for that priority, not
     * "due instantly" — such tickets never count down and never breach.
     */
    protected function resolutionDeadline(): ?Carbon
    {
        $rule = $this->priority?->slaRule;

        return $rule && $rule->resolution_mins > 0
            ? $this->created_at->clone()->addMinutes($rule->resolution_mins)
            : null;
    }

    /**
     * Whether the SLA resolution deadline has already passed — used by the
     * scheduled SLA-breach check, kept separate from slaInfo() so it doesn't
     * depend on parsing that method's display text.
     */
    public function isOverdue(): bool
    {
        if ($this->isClosed()) {
            return false;
        }

        $deadline = $this->resolutionDeadline();

        return $deadline !== null && now()->isAfter($deadline);
    }

    /**
     * Mirrors the design prototype's slaInfo(): overdue / remaining-hours / closed.
     */
    public function slaInfo(): array
    {
        if ($this->isClosed()) {
            return ['text' => 'Zamknięte', 'short' => '—', 'cls' => 'tag tag-neutral'];
        }

        $rule = $this->priority?->slaRule;
        $deadline = $this->resolutionDeadline();

        if (! $rule || $deadline === null) {
            return ['text' => 'Brak SLA', 'short' => 'Brak SLA', 'cls' => 'tag tag-neutral'];
        }

        $diffMinutes = now()->diffInMinutes($deadline, false);

        if ($diffMinutes < 0) {
            return ['text' => 'Przekroczono SLA', 'short' => 'Przekroczono', 'cls' => 'tag tag-accent'];
        }

        $hrs = (int) round($diffMinutes / 60);
        $warn = $diffMinutes < ($rule->resolution_mins * 0.25);

        return [
            'text' => "Pozostało {$hrs} godz.",
            'short' => "{$hrs} godz.",
            'cls' => $warn ? 'tag tag-outline' : 'tag tag-neutral',
        ];
    }

    /**
     * Total seconds an operator has spent with this ticket's detail view
     * open, including the currently running segment (if the timer is active).
     */
    public function timerElapsedSeconds(): int
    {
        $running = $this->timer_started_at ? $this->secondsSinceTimerStarted() : 0;

        return $this->time_spent_seconds + $running;
    }

    /**
     * Whole seconds between timer_started_at and now, via raw timestamp
     * subtraction rather than diffInSeconds() — Carbon 3 made the sign and
     * float-vs-int return type of diffInSeconds() depend on argument order,
     * which is easy to get backwards.
     */
    protected function secondsSinceTimerStarted(): int
    {
        return max(0, now()->getTimestamp() - $this->timer_started_at->getTimestamp());
    }

    public function timeSpentLabel(): string
    {
        $seconds = $this->timerElapsedSeconds();
        $hrs = intdiv($seconds, 3600);
        $mins = intdiv($seconds % 3600, 60);

        return $hrs > 0 ? "{$hrs} godz. {$mins} min." : "{$mins} min.";
    }

    /**
     * Checkpoints the running segment into the stored total without pausing
     * — called on every operator action so progress survives even if the
     * ticket is never explicitly stopped.
     */
    public function flushTimer(): void
    {
        if ($this->timer_started_at) {
            $this->update([
                'time_spent_seconds' => $this->time_spent_seconds + $this->secondsSinceTimerStarted(),
                'timer_started_at' => now(),
            ]);
        }
    }

    public function stopTimer(): void
    {
        if ($this->timer_started_at) {
            $this->update([
                'time_spent_seconds' => $this->time_spent_seconds + $this->secondsSinceTimerStarted(),
                'timer_started_at' => null,
            ]);
        }
    }

    /**
     * No-ops on a closed ticket — time tracking only applies to open work,
     * so a closed ticket's timer should never start (whether via auto-resume
     * on open or the manual "Wznów" button).
     */
    public function resumeTimer(): void
    {
        if ($this->isClosed()) {
            return;
        }

        if (! $this->timer_started_at) {
            $this->update(['timer_started_at' => now()]);
        }
    }

    public function resetTimer(): void
    {
        $this->update(['time_spent_seconds' => 0, 'timer_started_at' => null]);
    }

    /**
     * Manually overrides the tracked total (an operator correcting the
     * timer). If it's currently running, the running segment is re-based to
     * start now, so the edited value takes effect immediately instead of
     * being added to on top of the segment already in progress.
     */
    public function setTimeSpent(int $seconds): void
    {
        $this->update([
            'time_spent_seconds' => max(0, $seconds),
            'timer_started_at' => $this->timer_started_at ? now() : null,
        ]);
    }

    /**
     * Custom field values for this ticket's subcategory, in display order, skipping blanks.
     *
     * @return array<int, array{id: int, label: string, value: string}>
     */
    public function customFieldEntries(): array
    {
        if (! $this->subcategory_id) {
            return [];
        }

        $values = $this->custom_fields ?? [];

        return $this->subcategory->customFields
            ->filter(fn (CustomField $field) => array_key_exists($field->id, $values) && $values[$field->id] !== '' && $values[$field->id] !== null)
            ->map(fn (CustomField $field) => [
                'id' => $field->id,
                'label' => $field->label,
                'value' => $field->type === 'checkbox'
                    ? ($values[$field->id] ? 'Tak' : 'Nie')
                    : (string) $values[$field->id],
            ])
            ->values()
            ->all();
    }
}