using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using UnityEngine;

public static class SettingsApplier
{
    public static (bool OK, string log) ApplySettings(
        Dictionary<string, string> keyValuePairs,
        bool assumeMissingBoolOff
    )
    {
        List<Setting> settings = SettingsManager.Container.Settings;

        foreach (var kv in keyValuePairs)
        {
            var searchResult = GetSettingById(kv.Key, settings);
            if (searchResult.found)
                InjectNewValueToSetting(kv.Value, searchResult.setting);
        }

        // ВАЖНО:
        // - true: старое поведение для submit формы — то чего нет в POST, считаем false.
        // - false: новое поведение для realtime — ничего не трогаем кроме пришедшего id.
        if (assumeMissingBoolOff)
        {
            foreach (string id in FalseBoolSettingIds(settings, keyValuePairs.Keys.ToList()))
            {
                InjectNewValueToSetting("off", GetSettingById(id, settings).setting);
            }
        }

        return (OK: true, log: "");
    }

    private static (bool found, Setting setting) GetSettingById(string settingId, List<Setting> settings)
    {
        Setting setting = settings.Find(s => s.Id == settingId);
        if (setting != null)
            return (found: true, setting);
        else
            return (found: false, setting);
    }

    private static void InjectNewValueToSetting(string newValue, Setting setting)
    {
        if (setting == null) return;

        if (setting.Type == SettingType.String)
        {
            if (setting.AllowedValues.Contains(newValue))
                setting.StringValue = newValue;
            else
                Debug.Log($"{setting.Id}: недопустимое значение \"{newValue}\"");
        }
        else if (setting.Type == SettingType.Float)
        {
            if (!float.TryParse(newValue, NumberStyles.Float, CultureInfo.InvariantCulture, out float value))
            {
                Debug.Log($"{setting.Id}: ошибка парсинга float \"{newValue}\"");
                return;
            }

            if (value <= setting.FloatMax && value >= setting.FloatMin)
                setting.FloatValue = value;
            else
                Debug.Log($"{setting.Id}: float вне диапазона \"{newValue}\"");
        }
        else if (setting.Type == SettingType.Bool)
        {
            setting.BoolValue = (newValue == "on" || newValue == "true" || newValue == "1");
        }
        else if (setting.Type == SettingType.Int)
        {
            if (int.TryParse(newValue, out int iv))
                setting.IntValue = iv;
            else
                Debug.Log($"{setting.Id}: ошибка парсинга int \"{newValue}\"");
        }
    }

    private static List<string> FalseBoolSettingIds(List<Setting> settings, List<string> entry)
    {
        var missing = new List<string>();
        foreach (Setting setting in settings)
        {
            if (entry.Contains(setting.Id)) continue;
            missing.Add(setting.Id);
        }

        var boolIds = new List<string>();
        foreach (string id in missing)
        {
            var searchResult = GetSettingById(id, settings);
            if (searchResult.found && searchResult.setting.Type == SettingType.Bool)
                boolIds.Add(id);
        }

        return boolIds;
    }
}