<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;

class Interview extends Model
{
    use HasFactory;

    protected $fillable = [
        'candidate_name',
        'candidate_email',
        'candidate_phone',
        'job_title',
        'round',
        'description',
        'resume_path',
        'temp_password',
        'scheduled_at',
        'expires_at',
        'reminder_sent_at',
        'language',
        'status',
        'assigned_interviewers',
        'proctor_logs',
        'submitted_code',
        'submitted_language',
        'code_output',
        'recording_path',
        'recordings',
        'submission_unique_id',
        'candidate_notes',
        'candidate_drawing',
        'blocked_ip',
        'created_by',
        'call_status',
        'call_started_by',
        'call_started_at',
        'enable_tab_switch_screenshot',
        'tab_switch_screenshots',
        'active_peers',
    ];

    protected $casts = [
        'scheduled_at' => 'datetime',
        'expires_at' => 'datetime',
        'reminder_sent_at' => 'datetime',
        'call_started_at' => 'datetime',
        'enable_tab_switch_screenshot' => 'boolean',
        'assigned_interviewers' => 'array',
        'proctor_logs' => 'array',
        'recordings' => 'array',
        'tab_switch_screenshots' => 'array',
        'active_peers' => 'array',
    ];

    public function creator()
    {
        return $this->belongsTo(User::class, 'created_by');
    }

    public function callStarter()
    {
        return $this->belongsTo(User::class, 'call_started_by');
    }

    public function warnings()
    {
        return $this->hasMany(InterviewWarning::class, 'interview_id');
    }

    public function isExpired(): bool
    {
        return now()->greaterThan($this->expires_at);
    }

    /**
     * Check if the interview call is active and unexpired.
     */
    public function isCallActive(): bool
    {
        if ($this->isExpired() || in_array($this->status, ['completed', 'expired'])) {
            return false;
        }

        return $this->call_status === 'active';
    }

    /**
     * Check if the current time is within the interview timeline.
     */
    public function isActiveTimeline(): bool
    {
        $now = now();
        $start = $this->scheduled_at ?? $this->created_at;

        if ($now->lessThan($start)) {
            return false;
        }

        if ($now->greaterThan($this->expires_at)) {
            return false;
        }

        return ! in_array($this->status, ['completed', 'expired']);
    }

    /**
     * Check if a specific user is assigned as an interviewer.
     */
    public function isAssignedInterviewer($userId): bool
    {
        if (empty($this->assigned_interviewers)) {
            return false;
        }

        $interviewers = array_map('strval', (array) $this->assigned_interviewers);

        return in_array((string) $userId, $interviewers, true);
    }

    /**
     * Get computed initials for candidate (e.g. "John Doe" -> "JD").
     */
    public function getCandidateInitialsAttribute(): string
    {
        $parts = preg_split('/\s+/', trim($this->candidate_name ?? ''));
        if (count($parts) >= 2) {
            return strtoupper(substr($parts[0], 0, 1).substr(end($parts), 0, 1));
        }
        $nameStr = trim($this->candidate_name ?? '');

        return strtoupper(substr($nameStr, 0, 1).(strlen($nameStr) > 1 ? substr($nameStr, -1) : ''));
    }

    /**
     * Get proctoring alert metrics summary.
     */
    public function getProctorMetricsAttribute(): array
    {
        $logs = $this->proctor_logs ?? [];

        return [
            'tab_switches' => count(array_filter($logs, fn ($l) => ($l['type'] ?? '') === 'tab_switch')),
            'focus_lost' => count(array_filter($logs, fn ($l) => ($l['type'] ?? '') === 'focus_lost')),
            'gaze_alerts' => count(array_filter($logs, fn ($l) => in_array($l['type'] ?? '', ['gaze_anomaly', 'gaze_fixed_staring', 'looking_away']))),
            'lower_gaze' => count(array_filter($logs, fn ($l) => ($l['type'] ?? '') === 'gaze_lower_device')),
            'question_repeat' => count(array_filter($logs, fn ($l) => in_array($l['type'] ?? '', ['question_repeat_lower', 'question_repetition']))),
            'external_ai' => count(array_filter($logs, fn ($l) => ($l['type'] ?? '') === 'external_ai_detected')),
            'paste_events' => count(array_filter($logs, fn ($l) => ($l['type'] ?? '') === 'paste_event')),
            'total_incidents' => count($logs),
        ];
    }

    /**
     * Format timeline string: "M d, H:i – H:i".
     */
    public function getFormattedTimelineAttribute(): string
    {
        $start = $this->scheduled_at ?? $this->created_at;

        return $start->format('M d, H:i').' – '.$this->expires_at->format('H:i');
    }

    /**
     * Get the standardized iCalendar event title / name.
     * Pattern: Interview Invitation_{Round}_{Candidate First & Last Name}_{Job Title}_{Date}_{Time}
     * Example: Interview Invitation_R1_Soumyadeep Mondal_AIML (Computer Vision & Agentic AI) Engineer_11/8/2026_1700
     */
    public function getEventTitleAttribute(): string
    {
        $round = ! empty($this->round) ? $this->round : 'R1';
        $candidateName = ! empty($this->candidate_name) ? $this->candidate_name : 'Candidate';
        $jobTitle = ! empty($this->job_title) ? $this->job_title : 'Candidate Assessment';
        $scheduled = $this->scheduled_at ?? $this->created_at ?? now();
        $dateStr = $scheduled->format('j/n/Y');
        $timeStr = $scheduled->format('Hi');

        return "Interview Invitation_{$round}_{$candidateName}_{$jobTitle}_{$dateStr}_{$timeStr}";
    }

    /**
     * Get the User models corresponding to the assigned interviewers.
     */
    public function assignedUsers()
    {
        if (empty($this->assigned_interviewers)) {
            return collect();
        }

        return User::whereIn('id', (array) $this->assigned_interviewers)->get();
    }

    /**
     * Get the URL to view the candidate's resume.
     */
    public function getResumeUrlAttribute(): ?string
    {
        if (! $this->resume_path) {
            return null;
        }

        return route('interview.resume', $this->id);
    }
}