package themes_handler

import (
	"bytes"
	"encoding/base64"
	"encoding/json"
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"strings"

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

func (h *Handler) GetUserRole(c *gin.Context) {
	userID, _ := c.Get("user_id")
	userName, _ := c.Get("user_name")
	displayName, _ := c.Get("display_name")
	isAdmin, _ := c.Get("is_admin")
	userTag, _ := c.Get("user_tag")

	isAdminBool := false
	if isAdmin != nil {
		isAdminBool = isAdmin.(bool)
	}
	displayNameStr := ""
	if displayName != nil {
		displayNameStr = displayName.(string)
	}
	userTagStr := ""
	if userTag != nil {
		userTagStr = userTag.(string)
	}

	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > user role",
		"data": gin.H{
			"user_id":      userID,
			"user_name":    userName,
			"display_name": displayNameStr,
			"is_admin":     isAdminBool,
			"is_verified":  isAdminBool || userTagStr == "verified",
		},
	})
}

// GET /api/user/downloads (stretch goal)

func (h *Handler) GetUserDownloads(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > download history not yet implemented",
		"data": []interface{}{},
	})
}

// GET /api/marketplace/auth/captcha

func (h *Handler) GetCaptcha(c *gin.Context) {
	id := captcha.NewLen(4)
	var buf bytes.Buffer
	if err := captcha.WriteImage(&buf, id, 150, 50); err != nil {
		log.Printf("[E] CAPTCHA > failed to generate: %v", err)
		c.JSON(http.StatusInternalServerError, gin.H{"code": http.StatusInternalServerError, "msg": "captcha generation failed", "data": nil})
		return
	}
	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > captcha",
		"data": gin.H{
			"captchaId":    id,
			"captchaImage": "data:image/png;base64," + base64.StdEncoding.EncodeToString(buf.Bytes()),
		},
	})
}

// GET /api/marketplace/auth/config

func (h *Handler) GetAuthConfig(c *gin.Context) {
	cfg := h.Config
	casdoorConfigured := cfg.Backend.Casdoor.Endpoint != "" && cfg.Backend.Casdoor.ClientID != ""

	c.JSON(http.StatusOK, gin.H{
		"code": http.StatusOK,
		"msg":  "GET > auth config",
		"data": gin.H{
			"casdoor_configured":   casdoorConfigured,
			"casdoor_endpoint":     cfg.Backend.Casdoor.Endpoint,
			"casdoor_client_id":    cfg.Backend.Casdoor.ClientID,
			"casdoor_organization": cfg.Backend.Casdoor.Organization,
			"casdoor_application":  cfg.Backend.Casdoor.Application,
		},
	})
}

// POST /api/marketplace/auth/login

func (h *Handler) LoginProxy(c *gin.Context) {
	cfg := h.Config

	var req struct {
		Username string `json:"username"`
		Password string `json:"password"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": http.StatusBadRequest, "msg": "PUT > invalid request body", "data": nil})
		return
	}

	// Proxy to Casdoor OAuth token endpoint
	tokenURL := cfg.Backend.Casdoor.Endpoint + "/api/login/oauth/access_token"
	values := url.Values{
		"grant_type":    {"password"},
		"client_id":     {cfg.Backend.Casdoor.ClientID},
		"client_secret": {cfg.Backend.Casdoor.ClientSecret},
		"username":      {req.Username},
		"password":      {req.Password},
		"scope":         {"read"},
	}
	reqHTTP, err := http.NewRequestWithContext(c.Request.Context(), http.MethodPost, tokenURL, strings.NewReader(values.Encode()))
	if err != nil {
		fail(c, http.StatusBadGateway, "Invalid authentication server configuration")
		return
	}
	reqHTTP.Header.Set("Content-Type", "application/x-www-form-urlencoded")
	resp, err := h.HTTP.Do(reqHTTP)
	if err != nil {
		log.Printf("[E] AUTH > login proxy error: %v", err)
		c.JSON(http.StatusBadGateway, gin.H{"code": http.StatusBadGateway, "msg": "auth server unreachable", "data": nil})
		return
	}
	defer resp.Body.Close()

	body, readErr := io.ReadAll(io.LimitReader(resp.Body, 2<<20))
	if readErr != nil {
		fail(c, http.StatusBadGateway, "Unable to read authentication response")
		return
	}
	if resp.StatusCode != http.StatusOK {
		c.JSON(http.StatusUnauthorized, gin.H{"code": http.StatusUnauthorized, "msg": "invalid credentials", "data": nil})
		return
	}

	c.Header("Content-Type", "application/json")
	c.String(http.StatusOK, string(body))
}

// POST /api/marketplace/auth/signup

func (h *Handler) SignupProxy(c *gin.Context) {
	cfg := h.Config

	var req struct {
		Username    string `json:"username"`
		Password    string `json:"password"`
		Email       string `json:"email"`
		Name        string `json:"name"`
		CaptchaId   string `json:"captchaId"`
		CaptchaCode string `json:"captchaCode"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"code": http.StatusBadRequest, "msg": "PUT > invalid request body", "data": nil})
		return
	}
	if req.Username == "" || req.Password == "" {
		c.JSON(http.StatusBadRequest, gin.H{"code": http.StatusBadRequest, "msg": "用户名和密码为必填项", "data": nil})
		return
	}

	// Validate captcha
	if !captcha.VerifyString(req.CaptchaId, req.CaptchaCode) {
		c.JSON(http.StatusBadRequest, gin.H{"code": http.StatusBadRequest, "msg": "验证码错误或已过期", "data": nil})
		return
	}

	// Proxy to Casdoor signup API
	signupData := map[string]interface{}{
		"organization": cfg.Backend.Casdoor.Organization,
		"username":     req.Username,
		"password":     req.Password,
		"application":  cfg.Backend.Casdoor.Application,
	}
	if req.Email != "" {
		signupData["email"] = req.Email
	}
	if req.Name != "" {
		signupData["name"] = req.Name
	}
	signupURL := cfg.Backend.Casdoor.Endpoint + "/api/signup"
	signupBody, _ := json.Marshal(signupData)
	reqHTTP, err := http.NewRequestWithContext(c.Request.Context(), http.MethodPost, signupURL, bytes.NewReader(signupBody))
	if err != nil {
		fail(c, http.StatusBadGateway, "Invalid authentication server configuration")
		return
	}
	reqHTTP.Header.Set("Content-Type", "application/json")
	resp, err := h.HTTP.Do(reqHTTP)
	if err != nil {
		log.Printf("[E] AUTH > signup proxy error: %v", err)
		c.JSON(http.StatusBadGateway, gin.H{"code": http.StatusBadGateway, "msg": "auth server unreachable", "data": nil})
		return
	}
	defer resp.Body.Close()

	body, _ := io.ReadAll(resp.Body)

	var result map[string]interface{}
	json.Unmarshal(body, &result)

	if status, ok := result["status"]; !ok || status != "ok" {
		msg := "注册失败"
		if m, ok := result["msg"]; ok {
			msg = fmt.Sprintf("%v", m)
		}
		c.JSON(http.StatusBadRequest, gin.H{"code": http.StatusBadRequest, "msg": msg, "data": nil})
		return
	}

	log.Printf("[I] AUTH > signup successful for user: %s", req.Username)
	c.Header("Content-Type", "application/json")
	c.String(http.StatusOK, string(body))
}