using Sirenix.OdinInspector;
using UnityEngine;
using UnityEngine.UI;

namespace Ichni.Story.UI
{
    /// <summary>
    /// 故事树中单个 block 的视图基类。负责通用的定位、状态视觉与点击分发。
    /// 具体类型（文本 / 音乐 / 教程）由子类实现 <see cref="OnClicked"/>。
    /// </summary>
    public abstract class StoryBlockView : SerializedMonoBehaviour
    {
        [Header("Block State")]
        public string blockId;
        public StoryBlockState state;

        [Header("Common References")]
        public RectTransform blockRect;
        public RectTransform inPort;
        public RectTransform outPort;
        public Button button;

        // 关联的定义，供子类读取类型专属字段
        protected StoryBlockDefinition definition;

        /// <summary>
        /// 初始化 block 视图。逻辑坐标已由控制器按网格换算为 <paramref name="position"/>
        /// （以 BlockContainer 左侧中线为原点、x 向右为正、y 向下为正的 anchoredPosition）。
        /// </summary>
        /// <param name="def">block 定义（提供尺寸与类型专属数据）。</param>
        /// <param name="position">已换算好的 anchoredPosition。</param>
        /// <param name="blockState">推导得到的 block 状态。</param>
        public virtual void Initialize(StoryBlockDefinition def, Vector2 position, StoryBlockState blockState)
        {
            definition = def;
            blockId = def.blockId;
            state = blockState;

            // 统一坐标约定：以 BlockContainer 的左侧中线为原点，向右为 +x、向下为 +y。
            blockRect.anchorMin = new Vector2(0f, 0.5f);
            blockRect.anchorMax = new Vector2(0f, 0.5f);
            blockRect.pivot = new Vector2(0f, 0.5f);
            blockRect.sizeDelta = new Vector2(400, 200);
            blockRect.anchoredPosition = position;

            if (button != null)
                button.onClick.AddListener(HandleClick);

            ApplyState(state);
        }

        /// <summary>
        /// 应用状态并更新视觉。基类默认按状态切换按钮可交互性；
        /// 子类可 override 以更新锁定图标、颜色等具体表现。
        /// </summary>
        public virtual void ApplyState(StoryBlockState newState)
        {
            state = newState;

            if (button != null)
                button.interactable = state != StoryBlockState.Locked;
        }

        private void HandleClick()
        {
            if (state == StoryBlockState.Locked)
                return;

            if (StoryManager.instance != null && StoryManager.instance.treeController != null)
                StoryManager.instance.treeController.currentBlock = this;

            OnClicked();
        }

        /// <summary>
        /// 点击（非锁定状态）时的具体行为，由子类实现。
        /// </summary>
        protected abstract void OnClicked();
    }
}