using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class CharacterManager : MonoBehaviour
{
    // ========== SerializeField ==============
    [SerializeField] private Camera mainCamera;
    [SerializeField] private Transform characterContainer;
    [SerializeField] private float screenOffsetLeft = 8f;
    [SerializeField] private float screenOffsetRight = 6f;

    // ========== Private ======================
    private List<Character> characterList = new();
    private readonly List<Vector3> characterPositionList = new();

    private void Start()
    {
        if (mainCamera == null) mainCamera = Camera.main;
        MathWorldPositionPoint(); // 计算每个单位的站位
    }


    public void SetFightCharacter(List<Character> characters) => characterList = characters;

    public List<Card> RenderCharacterSprite()
    {
        List<Card> fightCharacterOwnedCard = new();
        for (var i = 0; i < characterList.Count; i++)
        {
            DATACLASS_CHARACTER_RENDER_DATA render_data;
            render_data.IS_ENEMY = false;
            render_data.RENDER_POSITION = characterPositionList[i];
            render_data.ROTATION = Quaternion.identity;
            GameObject character_prefab = Instantiate<GameObject>(
                characterList[i].gameObject,
                position: render_data.RENDER_POSITION,
                rotation: Quaternion.identity,
                parent: characterContainer
            );
            character_prefab.name = $"Character_{i}";
            characterList[i].RecordRenderData(render_data);
            var character_card = characterList[i].SetCardID();
            fightCharacterOwnedCard.AddRange(character_card);
        }

        return fightCharacterOwnedCard;
    }

    private void MathWorldPositionPoint()
    {
        // 计算屏幕边界
        float screen_half = Screen.width / 2f;
        float screen_offset_right = screen_half / screenOffsetRight; // 屏幕右边的偏移 
        float screen_offset_left = screen_half / screenOffsetLeft; // 屏幕左边的偏移
        float in_fact_space = screen_half - screen_offset_right - screen_offset_left; // 屏幕内实际可用空间
        float sprite_space = in_fact_space / 3f; // 3张牌的实际可用空间
        float sprite_offset = (sprite_space * 0 + sprite_space * 1) / 2f; // 每个角色偏移一个单位
        for (int i = 0; i < 3; i++)
        {
            float position_x = screen_offset_left + i * sprite_space + sprite_offset;
            characterPositionList.Add(switch_screen_position_to_world_position(position_x));
            // float position_x_enemy = screen_half + screen_offset_right + i * sprite_space + _sprite_offset;
            // enemyPositionList.Add(switch_screen_position_to_world_position(position_x_enemy));
        }

        Vector3 switch_screen_position_to_world_position(float screen_position_x)
        {
            Vector3 world_position = mainCamera!.ScreenToWorldPoint(
                new Vector3(screen_position_x, Screen.height / 2f, 0));
            world_position.y += characterContainer.transform.position.y;
            world_position.z = 0;
            return world_position;
        }
    }
}