package handler

import (
	"database/sql"
	"encoding/json"
	"net/http"
	"strconv"
	"time"

	"gpt-manager-go/internal/models"
	"gpt-manager-go/internal/repository"
	"gpt-manager-go/internal/service"
)

// ChatGPTAccountHandler ChatGPT 账号处理器
type ChatGPTAccountHandler struct {
	repo           *repository.ChatGPTAccountRepository
	chatgptService *service.ChatGPTService
}

// NewChatGPTAccountHandler 创建处理器
func NewChatGPTAccountHandler(repo *repository.ChatGPTAccountRepository, chatgptService *service.ChatGPTService) *ChatGPTAccountHandler {
	return &ChatGPTAccountHandler{
		repo:           repo,
		chatgptService: chatgptService,
	}
}

// CreateAccountRequest 创建账号请求
type CreateAccountRequest struct {
	Name          string `json:"name"`
	TeamAccountID string `json:"team_account_id"`
	AuthToken     string `json:"auth_token"`
}

// AccountResponse 账号响应
type AccountResponse struct {
	Success bool                   `json:"success"`
	Message string                 `json:"message"`
	Data    *models.ChatGPTAccount `json:"data,omitempty"`
}

// ListResponse 列表响应
type ListResponse struct {
	Success bool                     `json:"success"`
	Message string                   `json:"message"`
	Data    []*models.ChatGPTAccount `json:"data,omitempty"`
}

// Create 创建账号
func (h *ChatGPTAccountHandler) Create(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		respondJSON(w, http.StatusMethodNotAllowed, AccountResponse{
			Success: false,
			Message: "Method not allowed",
		})
		return
	}

	var req CreateAccountRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		respondJSON(w, http.StatusBadRequest, AccountResponse{
			Success: false,
			Message: "Invalid request body",
		})
		return
	}

	// 验证必填字段
	if req.TeamAccountID == "" || req.AuthToken == "" {
		respondJSON(w, http.StatusBadRequest, AccountResponse{
			Success: false,
			Message: "team_account_id and auth_token are required",
		})
		return
	}

	// 检查是否已存在
	existing, err := h.repo.FindByTeamAccountID(req.TeamAccountID)
	if err != nil {
		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Database error: " + err.Error(),
		})
		return
	}
	if existing != nil {
		respondJSON(w, http.StatusConflict, AccountResponse{
			Success: false,
			Message: "Team account already exists",
		})
		return
	}

	// 调用 ChatGPT API 获取订阅信息
	subInfo, err := h.chatgptService.GetSubscription(req.TeamAccountID, req.AuthToken)
	if err != nil {
		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Failed to verify team account: " + err.Error(),
		})
		return
	}

	// 设置账号名称
	name := req.Name
	if name == "" {
		name = "Team-" + req.TeamAccountID[:8]
	}

	// 创建账号
	account := &models.ChatGPTAccount{
		Name:          name,
		AuthToken:     req.AuthToken,
		TeamAccountID: req.TeamAccountID,
		SeatsInUse:    subInfo.SeatsInUse,
		SeatsEntitled: subInfo.SeatsEntitled,
		IsActive:      subInfo.IsValid,
	}

	// 设置时间
	if subInfo.IsValid {
		account.ActiveStart = sql.NullTime{Time: subInfo.ActiveStart, Valid: !subInfo.ActiveStart.IsZero()}
		account.ActiveUntil = sql.NullTime{Time: subInfo.ActiveUntil, Valid: !subInfo.ActiveUntil.IsZero()}
		account.LastCheck = sql.NullTime{Time: time.Now(), Valid: true}
	}

	if err := h.repo.Create(account); err != nil {
		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Failed to create account: " + err.Error(),
		})
		return
	}

	// 隐藏敏感信息
	account.AuthToken = ""

	respondJSON(w, http.StatusCreated, AccountResponse{
		Success: true,
		Message: "Account created successfully",
		Data:    account,
	})
}

// List 获取账号列表
func (h *ChatGPTAccountHandler) List(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		respondJSON(w, http.StatusMethodNotAllowed, ListResponse{
			Success: false,
			Message: "Method not allowed",
		})
		return
	}

	accounts, err := h.repo.FindAll()
	if err != nil {
		respondJSON(w, http.StatusInternalServerError, ListResponse{
			Success: false,
			Message: "Failed to fetch accounts",
		})
		return
	}

	// 隐藏敏感信息
	for _, a := range accounts {
		a.AuthToken = ""
	}

	respondJSON(w, http.StatusOK, ListResponse{
		Success: true,
		Message: "OK",
		Data:    accounts,
	})
}

// Refresh 刷新账号信息
func (h *ChatGPTAccountHandler) Refresh(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		respondJSON(w, http.StatusMethodNotAllowed, AccountResponse{
			Success: false,
			Message: "Method not allowed",
		})
		return
	}

	// 获取账号 ID
	idStr := r.URL.Query().Get("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		respondJSON(w, http.StatusBadRequest, AccountResponse{
			Success: false,
			Message: "Invalid account ID",
		})
		return
	}

	account, err := h.repo.FindByID(id)
	if err != nil || account == nil {
		respondJSON(w, http.StatusNotFound, AccountResponse{
			Success: false,
			Message: "Account not found",
		})
		return
	}

	// 调用 ChatGPT API 获取订阅信息
	subInfo, err := h.chatgptService.GetSubscription(account.TeamAccountID, account.AuthToken)
	if err != nil {
		// API 调用失败，增加失败计数并设为不活跃
		account.ConsecutiveFailures++
		account.IsActive = false
		account.LastCheck = sql.NullTime{Time: time.Now(), Valid: true}
		h.repo.Update(account)

		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Failed to refresh: " + err.Error(),
		})
		return
	}

	// 更新账号信息
	if subInfo.IsValid {
		account.SeatsInUse = subInfo.SeatsInUse
		account.SeatsEntitled = subInfo.SeatsEntitled
		account.ActiveStart = sql.NullTime{Time: subInfo.ActiveStart, Valid: !subInfo.ActiveStart.IsZero()}
		account.ActiveUntil = sql.NullTime{Time: subInfo.ActiveUntil, Valid: !subInfo.ActiveUntil.IsZero()}
		account.IsActive = true
		account.ConsecutiveFailures = 0
	} else {
		account.IsActive = false
		account.ConsecutiveFailures++
	}
	account.LastCheck = sql.NullTime{Time: time.Now(), Valid: true}

	if err := h.repo.Update(account); err != nil {
		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Failed to update account",
		})
		return
	}

	// 隐藏敏感信息
	account.AuthToken = ""

	respondJSON(w, http.StatusOK, AccountResponse{
		Success: true,
		Message: "Account refreshed successfully",
		Data:    account,
	})
}

// Delete 删除账号
func (h *ChatGPTAccountHandler) Delete(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodDelete {
		respondJSON(w, http.StatusMethodNotAllowed, AccountResponse{
			Success: false,
			Message: "Method not allowed",
		})
		return
	}

	idStr := r.URL.Query().Get("id")
	id, err := strconv.Atoi(idStr)
	if err != nil {
		respondJSON(w, http.StatusBadRequest, AccountResponse{
			Success: false,
			Message: "Invalid account ID",
		})
		return
	}

	if err := h.repo.Delete(id); err != nil {
		respondJSON(w, http.StatusInternalServerError, AccountResponse{
			Success: false,
			Message: "Failed to delete account",
		})
		return
	}

	respondJSON(w, http.StatusOK, AccountResponse{
		Success: true,
		Message: "Account deleted successfully",
	})
}