<?php

namespace App\Models;

use Database\Factories\CharacterFactory;
use Illuminate\Database\Eloquent\Attributes\Fillable;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;

/**
 * In-world avatar of a platform user (or NPC child without a user).
 *
 * Stores position, survival needs, employment and social state. The world
 * ticker mutates needs and job progress continuously while nobody is online.
 */
#[Fillable([
    'user_id', 'city_id', 'name', 'skin', 'hair', 'shirt',
    'pos_x', 'pos_y', 'pos_z', 'money', 'energy', 'hunger', 'thirst', 'health',
    'state', 'job_id', 'house_id', 'education', 'exercise_count', 'is_online', 'last_tick_at',
    'hospitalized_until',
])]
class Character extends Model
{
    /** @use HasFactory<CharacterFactory, $this> */
    use HasFactory;

    public const STATE_AWAKE = 'awake';

    public const STATE_SLEEPING = 'sleeping';

    public const STATE_WORKING = 'working';

    public const STATE_STUDYING = 'studying';

    /**
     * Character is exercising on public plaza gym equipment.
     *
     * @var string
     */
    public const STATE_EXERCISING = 'exercising';

    /**
     * Character admitted to the hospital after a traffic accident.
     *
     * @var string
     */
    public const STATE_HOSPITAL = 'hospital';

    /**
     * Hospital stay length in seconds (one game hour).
     *
     * The day/night cycle is 240 real seconds per 24 game hours, so one
     * game hour equals 10 real seconds.
     *
     * @var int
     */
    public const HOSPITAL_STAY_SECONDS = 10;

    /**
     * Default hospital bed coordinates used when no hospital building exists.
     * Kept mid-block (away from road lanes) so vehicles never hit the bed.
     *
     * @var array{0: float, 1: float}
     */
    public const HOSPITAL_POS = [60.0, -51.0];

    /**
     * Owning user account (null for NPC children).
     *
     * @return BelongsTo<User, $this>
     */
    public function user(): BelongsTo
    {
        return $this->belongsTo(User::class);
    }

    /**
     * City where this character lives.
     *
     * @return BelongsTo<City, $this>
     */
    public function city(): BelongsTo
    {
        return $this->belongsTo(City::class);
    }

    /**
     * Current job position, when employed.
     *
     * @return BelongsTo<Job, $this>
     */
    public function job(): BelongsTo
    {
        return $this->belongsTo(Job::class);
    }

    /**
     * Complete house owned by this character, when any.
     *
     * @return BelongsTo<Building, $this>
     */
    public function house(): BelongsTo
    {
        return $this->belongsTo(Building::class, 'house_id');
    }

    /**
     * Buildings constructed by this character.
     *
     * @return HasMany<Building, $this>
     */
    public function buildings(): HasMany
    {
        return $this->hasMany(Building::class, 'owner_character_id');
    }

    /**
     * Inventory stacks owned by this character.
     *
     * @return HasMany<InventoryItem, $this>
     */
    public function inventory(): HasMany
    {
        return $this->hasMany(InventoryItem::class);
    }

    /**
     * Character of a linked user, when this account has one.
     */
    public function forUser(int $userId): bool
    {
        return (int) $this->user_id === $userId;
    }

    /**
     * Get or create the character for an approved user in the given city.
     */
    public static function ensureForUser(User $user, ?City $city = null): self
    {
        $existing = self::query()->where('user_id', $user->id)->first();
        if ($existing) {
            return $existing;
        }

        $city ??= City::active();
        abort_if($city === null, 500, 'No active city available.');

        $firstName = trim(explode(' ', $user->name)[0] ?? $user->email);

        $character = self::create([
            'user_id' => $user->id,
            'city_id' => $city->id,
            'name' => $firstName,
            'skin' => random_int(1, 4),
            'hair' => random_int(1, 4),
            'shirt' => random_int(1, 5),
            'pos_x' => 0,
            'pos_y' => 0,
            'pos_z' => 25,
            'money' => 100,
            'energy' => 100,
            'hunger' => 100,
            'thirst' => 100,
            'health' => 100,
            'state' => self::STATE_AWAKE,
            'education' => 0,
            'exercise_count' => 0,
            'is_online' => false,
        ]);

        // Starter kit so new citizens can eat, drink and build immediately.
        foreach ([
            InventoryItem::ITEM_FOOD => 3,
            InventoryItem::ITEM_WATER => 3,
            InventoryItem::ITEM_MATERIALS => 60,
        ] as $item => $qty) {
            InventoryItem::create([
                'character_id' => $character->id,
                'item' => $item,
                'qty' => $qty,
            ]);
        }

        return $character;
    }

    /**
     * Get the attributes that should be cast.
     *
     * @return array<string, string>
     */
    protected function casts(): array
    {
        return [
            'pos_x' => 'float',
            'pos_y' => 'float',
            'pos_z' => 'float',
            'money' => 'float',
            'energy' => 'integer',
            'hunger' => 'integer',
            'thirst' => 'integer',
            'health' => 'integer',
            'education' => 'integer',
            'exercise_count' => 'integer',
            'is_online' => 'boolean',
            'last_tick_at' => 'datetime',
            'hospitalized_until' => 'datetime',
        ];
    }

    /**
     * Determine whether the character is currently admitted to the hospital.
     */
    public function isHospitalized(): bool
    {
        return $this->state === self::STATE_HOSPITAL
            && $this->hospitalized_until !== null
            && $this->hospitalized_until->isFuture();
    }

    /**
     * Admit the character to the hospital for one game hour after an accident.
     *
     * Teleports them to the city hospital bed and returns the bed position.
     *
     * @return array{0: float, 1: float}
     */
    public function admitToHospital(): array
    {
        $hospital = Building::query()
            ->where('city_id', $this->city_id)
            ->where('type', Building::TYPE_HOSPITAL)
            ->where('is_complete', true)
            ->first();

        $x = $hospital ? (float) $hospital->pos_x : self::HOSPITAL_POS[0];
        $z = $hospital ? (float) ($hospital->pos_z + $hospital->depth / 2 + 3) : self::HOSPITAL_POS[1];

        $this->forceFill([
            'state' => self::STATE_HOSPITAL,
            'hospitalized_until' => now()->addSeconds(self::HOSPITAL_STAY_SECONDS),
            'pos_x' => $x,
            'pos_z' => $z,
            'pos_y' => 0,
        ])->save();

        return [$x, $z];
    }

    /**
     * Release the character from the hospital when the one-hour stay has elapsed.
     */
    public function releaseIfHospitalStayOver(): bool
    {
        if ($this->state !== self::STATE_HOSPITAL) {
            return false;
        }

        if ($this->hospitalized_until === null || $this->hospitalized_until->isPast()) {
            $this->forceFill([
                'state' => self::STATE_AWAKE,
                'hospitalized_until' => null,
            ])->save();

            return true;
        }

        return false;
    }
}