package api

import (
	"net/http"
	"strconv"
	"strings"

	"home-vue-go/internal/database"
	"home-vue-go/internal/ent"
	"home-vue-go/internal/ent/contact"

	"github.com/gin-gonic/gin"
)

func GetContacts(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		ctx := c.Request.Context()
		contacts, err := db.Client.Contact.Query().Order(contact.BySortOrder(), contact.ByID()).All(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		result := make([]gin.H, len(contacts))
		for i, contact := range contacts {
			result[i] = gin.H{
				"id":         contact.ID,
				"type":       contact.Type,
				"icon":       contact.Icon,
				"url":        contact.URL,
				"qrCode":     contact.QrCode,
				"hoverColor": contact.HoverColor,
				"sortOrder":  contact.SortOrder,
			}
		}

		c.JSON(http.StatusOK, result)
	}
}

func ReorderContacts(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		var req struct {
			IDs []int `json:"ids" binding:"required"`
		}

		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		if len(req.IDs) == 0 {
			c.JSON(http.StatusBadRequest, gin.H{"error": "排序列表不能为空"})
			return
		}

		seen := make(map[int]bool, len(req.IDs))
		for _, id := range req.IDs {
			if id <= 0 {
				c.JSON(http.StatusBadRequest, gin.H{"error": "排序列表包含无效ID"})
				return
			}
			if seen[id] {
				c.JSON(http.StatusBadRequest, gin.H{"error": "排序列表包含重复ID"})
				return
			}
			seen[id] = true
		}

		ctx := c.Request.Context()
		existingIDs, err := db.Client.Contact.Query().IDs(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}
		if len(existingIDs) != len(req.IDs) {
			c.JSON(http.StatusBadRequest, gin.H{"error": "排序列表与当前联系方式数量不一致"})
			return
		}
		existing := make(map[int]bool, len(existingIDs))
		for _, id := range existingIDs {
			existing[id] = true
		}
		for _, id := range req.IDs {
			if !existing[id] {
				c.JSON(http.StatusBadRequest, gin.H{"error": "排序列表包含不存在的联系方式"})
				return
			}
		}

		tx, err := db.Client.Tx(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		for index, id := range req.IDs {
			if _, err := tx.Contact.UpdateOneID(id).SetSortOrder((index + 1) * 10).Save(ctx); err != nil {
				_ = tx.Rollback()
				c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
				return
			}
		}

		if err := tx.Commit(); err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		contacts, err := db.Client.Contact.Query().Order(contact.BySortOrder(), contact.ByID()).All(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		result := make([]gin.H, len(contacts))
		for i, contact := range contacts {
			result[i] = gin.H{
				"id":         contact.ID,
				"type":       contact.Type,
				"icon":       contact.Icon,
				"url":        contact.URL,
				"qrCode":     contact.QrCode,
				"hoverColor": contact.HoverColor,
				"sortOrder":  contact.SortOrder,
			}
		}

		c.JSON(http.StatusOK, result)
	}
}

func CreateContact(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		var req struct {
			Type       string `json:"type" binding:"required"`
			Icon       string `json:"icon" binding:"required"`
			URL        string `json:"url"`
			QrCode     string `json:"qrCode"`
			HoverColor string `json:"hoverColor"`
			SortOrder  int    `json:"sortOrder"`
		}

		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		req.Type = strings.TrimSpace(req.Type)
		req.Icon = strings.TrimSpace(req.Icon)
		req.URL = strings.TrimSpace(req.URL)
		req.QrCode = strings.TrimSpace(req.QrCode)
		req.HoverColor = strings.TrimSpace(req.HoverColor)
		if req.Type == "" || req.Icon == "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "类型和图标不能为空"})
			return
		}

		if req.URL != "" && !validContactURL(req.URL) {
			c.JSON(http.StatusBadRequest, gin.H{"error": "联系方式URL必须是有效的http/https/mailto/tel地址"})
			return
		}
		if req.QrCode != "" && !validQRCode(req.QrCode) {
			c.JSON(http.StatusBadRequest, gin.H{"error": "二维码必须使用本地上传路径或安全的http/https图片地址"})
			return
		}
		if req.URL != "" && req.QrCode != "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "联系方式不能同时设置链接和二维码"})
			return
		}
		if req.URL == "" && req.QrCode == "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "链接或二维码不能为空"})
			return
		}

		ctx := c.Request.Context()
		create := db.Client.Contact.Create().
			SetType(req.Type).
			SetIcon(req.Icon).
			SetSortOrder(req.SortOrder)

		if req.URL != "" {
			create.SetURL(req.URL)
		}
		if req.QrCode != "" {
			create.SetQrCode(req.QrCode)
		}
		if req.HoverColor != "" {
			create.SetHoverColor(req.HoverColor)
		}

		contact, err := create.Save(ctx)
		if err != nil {
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		c.JSON(http.StatusOK, gin.H{
			"id":         contact.ID,
			"type":       contact.Type,
			"icon":       contact.Icon,
			"url":        contact.URL,
			"qrCode":     contact.QrCode,
			"hoverColor": contact.HoverColor,
			"sortOrder":  contact.SortOrder,
		})
	}
}

func UpdateContact(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := strconv.Atoi(c.Param("id"))
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "无效的ID"})
			return
		}

		var req struct {
			Type       string `json:"type" binding:"required"`
			Icon       string `json:"icon" binding:"required"`
			URL        string `json:"url"`
			QrCode     string `json:"qrCode"`
			HoverColor string `json:"hoverColor"`
			SortOrder  int    `json:"sortOrder"`
		}

		if err := c.ShouldBindJSON(&req); err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
			return
		}
		req.Type = strings.TrimSpace(req.Type)
		req.Icon = strings.TrimSpace(req.Icon)
		req.URL = strings.TrimSpace(req.URL)
		req.QrCode = strings.TrimSpace(req.QrCode)
		req.HoverColor = strings.TrimSpace(req.HoverColor)
		if req.Type == "" || req.Icon == "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "类型和图标不能为空"})
			return
		}

		if req.URL != "" && !validContactURL(req.URL) {
			c.JSON(http.StatusBadRequest, gin.H{"error": "联系方式URL必须是有效的http/https/mailto/tel地址"})
			return
		}
		if req.QrCode != "" && !validQRCode(req.QrCode) {
			c.JSON(http.StatusBadRequest, gin.H{"error": "二维码必须使用本地上传路径或安全的http/https图片地址"})
			return
		}
		if req.URL != "" && req.QrCode != "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "联系方式不能同时设置链接和二维码"})
			return
		}
		if req.URL == "" && req.QrCode == "" {
			c.JSON(http.StatusBadRequest, gin.H{"error": "链接或二维码不能为空"})
			return
		}

		ctx := c.Request.Context()
		update := db.Client.Contact.UpdateOneID(id)
		update.SetType(req.Type)
		update.SetIcon(req.Icon)
		if req.URL != "" {
			update.SetURL(req.URL)
		} else {
			update.ClearURL()
		}
		if req.QrCode != "" {
			update.SetQrCode(req.QrCode)
		} else {
			update.ClearQrCode()
		}
		if req.HoverColor != "" {
			update.SetHoverColor(req.HoverColor)
		} else {
			update.ClearHoverColor()
		}
		update.SetSortOrder(req.SortOrder)

		contact, err := update.Save(ctx)
		if err != nil {
			if ent.IsNotFound(err) {
				c.JSON(http.StatusNotFound, gin.H{"error": "联系方式不存在"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		c.JSON(http.StatusOK, gin.H{
			"id":         contact.ID,
			"type":       contact.Type,
			"icon":       contact.Icon,
			"url":        contact.URL,
			"qrCode":     contact.QrCode,
			"hoverColor": contact.HoverColor,
			"sortOrder":  contact.SortOrder,
		})
	}
}

func DeleteContact(db *database.Database) gin.HandlerFunc {
	return func(c *gin.Context) {
		id, err := strconv.Atoi(c.Param("id"))
		if err != nil {
			c.JSON(http.StatusBadRequest, gin.H{"error": "无效的ID"})
			return
		}

		ctx := c.Request.Context()
		if err := db.Client.Contact.DeleteOneID(id).Exec(ctx); err != nil {
			if ent.IsNotFound(err) {
				c.JSON(http.StatusNotFound, gin.H{"error": "联系方式不存在"})
				return
			}
			c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
			return
		}

		c.JSON(http.StatusOK, gin.H{"message": "删除成功"})
	}
}