package main

import (
	"embed"
	"fmt"
	"net/http"

	"f1-game/internal/algorithm/astar"
	"f1-game/internal/algorithm/astar6"
	"f1-game/internal/types"

	cherryTime "github.com/cherry-game/cherry/extend/time"
	"github.com/gin-gonic/gin"
)

//go:embed index.html
var staticFiles embed.FS

var (
	aStar   *astar.AStar
	aStarV6 *astar6.AStar
	// mapSize represents the width and height of the grid
	mapSize int32 = 1000
)

// PathRequest represents the request body for finding a path
// Contains start point, end point, and optional obstacle points
type PathRequest struct {
	StartX    int32   `json:"startX"`
	StartY    int32   `json:"startY"`
	EndX      int32   `json:"endX"`
	EndY      int32   `json:"endY"`
	Obstacles []Point `json:"obstacles"` // 障碍点列表
}

type Point struct {
	X int32 `json:"x"`
	Y int32 `json:"y"`
}

func main() {
	// Initialize A*
	// Initializing with all 1 (walkable)
	mapData := make([][]int32, mapSize)
	for i := range mapData {
		mapData[i] = make([]int32, mapSize)
		for j := range mapData[i] {
			mapData[i][j] = 1 //可走
		}
	}

	config := astar.Config{
		Width:          mapSize,
		Height:         mapSize,
		MapData:        mapData,
		IsWalkableFunc: nil,
		IsDebug:        false,
	}

	aStar = astar.New(config)

	// 初始化 astar6 算法
	config6 := astar6.Config{
		Min:            types.NewPoint(1, 1),
		Max:            types.NewPoint(mapSize, mapSize),
		MapData:        mapData,
		IsWalkableFunc: nil,
		IsDebug:        false,
	}

	aStarV6 = astar6.New(config6)

	r := gin.Default()

	r.GET("/", func(c *gin.Context) {
		// Serve the embedded index.html
		content, err := staticFiles.ReadFile("index.html")
		if err != nil {
			c.String(http.StatusInternalServerError, "Could not read index.html")
			return
		}
		c.Data(http.StatusOK, "text/html; charset=utf-8", content)
	})

	// POST /find-path - 寻找路径接口
	// 功能：根据起点、终点和障碍点列表，使用A*算法计算最优路径
	r.POST("/find-path", func(c *gin.Context) {
		var req PathRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}

		// 重置缓存
		aStar.ResetCache()

		// 设置障碍点（0表示不可行走）
		for _, obs := range req.Obstacles {
			aStar.SetObstacles(obs.X, obs.Y, false)
		}

		ct := cherryTime.Now()
		pathNodes, err := aStar.FindPath(req.StartX, req.StartY, req.EndX, req.EndY)
		costTime := ct.NowDiffMillisecond()

		if !err {
			c.JSON(http.StatusOK, gin.H{"path": []Point{}, "error": err}) // Return empty path on error (no path found)
			return
		}

		// Convert to simple Point struct for JSON
		path := make([]Point, len(pathNodes))
		for i, node := range pathNodes {
			path[i] = Point{
				X: node.X(),
				Y: node.Y(),
			}
		}

		c.JSON(http.StatusOK, gin.H{
			"path":     path,
			"costTime": costTime,
		})
	})

	// POST /find-path-astar6 - 使用 astar6 寻找路径接口
	// 功能：根据起点、终点和障碍点列表，使用 astar6 算法计算最优路径
	r.POST("/find-path-astar6", func(c *gin.Context) {
		var req PathRequest
		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}

		aStarV6.ResetCache()

		// 设置障碍点（0表示不可行走）
		for _, obs := range req.Obstacles {
			aStarV6.SetNode(obs.X, obs.Y, false)
		}

		ct := cherryTime.Now()
		pathNodes, found := aStarV6.FindPath(astar6.DefaultFindContext(req.StartX, req.StartY, req.EndX, req.EndY))
		costTime := ct.NowDiffMillisecond()

		if !found {
			c.JSON(http.StatusOK, gin.H{"path": []Point{}, "error": "No path found"})
			return
		}

		// Convert to simple Point struct for JSON
		path := make([]Point, len(pathNodes))
		for i, node := range pathNodes {
			path[i] = Point{
				X: node.X(),
				Y: node.Y(),
			}
		}

		c.JSON(http.StatusOK, gin.H{
			"path":     path,
			"costTime": costTime,
		})
	})

	fmt.Println("Server running on http://localhost:8080")
	r.Run(":8080")
}