package handler

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

	"memora-api/internal/request"
	"memora-api/internal/service"

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

type WordHandler struct {
	wordService *service.WordService
}

func NewWordHandler(wordService *service.WordService) *WordHandler {
	return &WordHandler{wordService: wordService}
}

// 添加单词（记忆模式）
func (h *WordHandler) AddWord(c *gin.Context) {
	var req request.AddWordRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// 调用有道API查询
	youdaoResp, err := h.wordService.QueryWord(req.Word)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "查询失败: " + err.Error()})
		return
	}

	if youdaoResp.ErrorCode != "0" && youdaoResp.ErrorCode != "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": fmt.Sprintf("有道API错误: %s", youdaoResp.ErrorCode)})
		return
	}

	// 保存到数据库
	word, err := h.wordService.SaveWord(req.Word, youdaoResp)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": "保存失败: " + err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"message": "单词添加成功",
		"data":    word,
	})
}

// 获取复习单词列表
func (h *WordHandler) GetReviewWords(c *gin.Context) {
	mode := c.DefaultQuery("mode", "spelling")
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "10"))

	words, err := h.wordService.GetReviewWords(mode, limit)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": words})
}

// 提交复习答案
func (h *WordHandler) SubmitReview(c *gin.Context) {
	var req request.ReviewAnswerRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	result, err := h.wordService.SubmitReviewAnswer(req)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": result})
}

// 获取所有单词
func (h *WordHandler) GetWords(c *gin.Context) {
	limit, _ := strconv.Atoi(c.DefaultQuery("limit", "20"))
	offset, _ := strconv.Atoi(c.DefaultQuery("offset", "0"))

	words, total, err := h.wordService.GetAllWords(limit, offset)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"data":  words,
		"total": total,
	})
}

// 获取统计信息
func (h *WordHandler) GetStatistics(c *gin.Context) {
	stats, err := h.wordService.GetStatistics()
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"data": stats})
}

// 获取音频文件
func (h *WordHandler) GetAudio(c *gin.Context) {
	word := c.Query("word")
	audioType := c.DefaultQuery("type", "uk")

	if word == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "缺少word参数"})
		return
	}

	// very small sanitization
	word = strings.TrimSpace(word)
	if word == "" {
		c.JSON(http.StatusBadRequest, gin.H{"error": "word为空"})
		return
	}
	for _, r := range word {
		if !(r >= 'a' && r <= 'z' || r >= 'A' && r <= 'Z') {
			c.JSON(http.StatusBadRequest, gin.H{"error": "word包含非法字符"})
			return
		}
	}
	filename := word + "_" + audioType + ".mp3"
	path := "./audio/" + filename
	c.File(path)
}