package main

import (
	"errors"
	"log"
	"net/http"

	"github.com/gin-contrib/cors"
	"github.com/gin-gonic/gin"
	"github.com/joho/godotenv"
	"gorm.io/driver/sqlite"
	"gorm.io/gorm"

	"log101-blog-services/middleware"
)

var db *gorm.DB

// Emoji counts for each post are retrieved in this format
type PostReaction struct {
	Emoji      string
	TotalCount int
}

type EmojiReaction struct {
	UserAnonIp string
	PostId     string
	Emoji      string
}

// Get the emoji counts foe a given post id
func countEmojis(postId string) (map[string]int, error) {
	postReactions := []PostReaction{}

	// Get the emoji counts for each emoji
	// rows, err :=  db.Query("SELECT emoji, COUNT(*) FROM emoji_clicks WHERE post_id = ? GROUP BY emoji;", postId)
	rows := db.Model(&EmojiReaction{}).Where("post_id = ?", postId).Select([]string{"emoji", "COUNT(*) as total_count"}).Group("emoji").Find(&postReactions)
	if rows.Error != nil {
		return nil, errors.New("couldn't get emoji counts")
	}

	// Transform rows to map
	result := make(map[string]int)
	for _, reaction := range postReactions {
		result[reaction.Emoji] = reaction.TotalCount
	}

	return result, nil
}

func main() {
	// Load environment variables
	err := godotenv.Load()
	if err != nil {
		log.Fatal("Error loading .env file")
	}

	db, err = gorm.Open(sqlite.Open("test.db"), &gorm.Config{})
	if err != nil {
		panic("failed to connect database")
	}

	db.AutoMigrate(&EmojiReaction{})

	r := gin.Default()
	r.LoadHTMLGlob("templates/*")

	// CORS configuration
	corsConfig := cors.DefaultConfig()
	corsConfig.AllowOrigins = []string{"https://log101.dev"}

	ginMode := gin.Mode()
	if ginMode == gin.DebugMode {
		corsConfig.AllowOrigins = append(corsConfig.AllowOrigins, "http://localhost:4321")
	}

	corsConfig.AllowHeaders = []string{"hx-current-url", "hx-request", "hx-target", "hx-trigger"}

	// Middlewares
	r.Use(cors.New(corsConfig))
	r.Use(middleware.AnonymizeIPMiddleware())

	var hxPostUrl string
	if ginMode == gin.DebugMode {
		hxPostUrl = "http://localhost:8000/blog/api/forms/emoji/post"
	} else {
		hxPostUrl = "https://log101.dev/blog/api/forms/emoji/post"
	}

	blogForm := r.Group("/blog/api/")
	{
		// Get the emoji form, you must provide postId query parameter
		blogForm.GET("/forms/emoji", func(c *gin.Context) {
			postId := c.Query("postId")

			// get emoji counts for each emoji
			emojiCounter, err := countEmojis(postId)
			if err != nil {
				c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{"error": "error getting the emoji counts", "postId": postId, "hxPostUrl": hxPostUrl})
				return
			}

			// Return the html template
			c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{
				"postId":    c.Query("postId"),
				"results":   emojiCounter,
				"hxPostUrl": hxPostUrl,
			})
		})

		// Update the emoji counter, this handler will
		// add a new entry to the database with anonymized ip
		// then sums the results to get the emoji counter
		blogForm.POST("/forms/emoji/post", func(c *gin.Context) {
			reactedPostId := c.PostForm("postId")
			reaction := c.PostForm("emojiInput")

			// Check if parameters are missing
			if reactedPostId == "" || reaction == "" {
				c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{"error": "missing parameters", "postId": reactedPostId, "hxPostUrl": hxPostUrl})
				return
			}

			// Add the new emoji entry to the database
			// _, err := db.Exec("INSERT INTO emoji_clicks (user_anon_data, post_id, emoji) VALUES (?, ?, ?) ON DUPLICATE KEY UPDATE emoji = ?", c.Request.RemoteAddr, postId, emoji, emoji)
			result := db.Create(&EmojiReaction{UserAnonIp: c.Request.RemoteAddr, Emoji: reaction, PostId: reactedPostId})
			if result.Error != nil {
				c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{"error": "error writing to database", "postId": reactedPostId, "hxPostUrl": hxPostUrl})
				return
			}

			// get emoji counts for each emoji
			emojiCounter, err := countEmojis(reactedPostId)
			if err != nil {
				c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{"error": "error getting the emoji counts", "postId": reactedPostId, "hxPostUrl": hxPostUrl})
				return
			}

			// Return the html with the updated emoji counter
			c.HTML(http.StatusOK, "emoji_form.tmpl", gin.H{"postId": reactedPostId, "results": emojiCounter, "hxPostUrl": hxPostUrl})
		})
	}

	r.Run(":8000")
}