package handler

import (
	"fmt"
	"net/http"

	"gpt-plus/internal/db"
	"gpt-plus/internal/service"

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

func RegisterAccountRoutes(api *gin.RouterGroup) {
	api.GET("/accounts", ListAccounts)
	api.GET("/accounts/:id", GetAccount)
	api.POST("/accounts/check", CheckAccounts)
	api.POST("/accounts/:id/check", CheckSingleAccount)
	api.POST("/accounts/test-model", TestModel)
	api.PUT("/accounts/:id/note", UpdateAccountNote)
	api.POST("/accounts/export", ExportAccounts)
	api.POST("/accounts/:id/transfer-to-cpa", TransferToCPA)
}

func ListAccounts(c *gin.Context) {
	d := db.GetDB()
	query := d.Model(&db.Account{}).Order("created_at DESC")

	plan := c.Query("plan")
	if plan != "" && plan != "all" {
		query = query.Where("plan = ?", plan)
	}
	// "all" or empty: show everything

	if status := c.Query("status"); status != "" {
		query = query.Where("status = ?", status)
	}

	if search := c.Query("search"); search != "" {
		query = query.Where("email LIKE ?", "%"+search+"%")
	}

	p := db.PaginationParams{Page: intQuery(c, "page", 1), Size: intQuery(c, "size", 20)}
	var accounts []db.Account
	result, err := db.Paginate(query, p, &accounts)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	for i := range accounts {
		if accounts[i].Plan == "team_owner" {
			d.Where("parent_id = ?", accounts[i].ID).Find(&accounts[i].SubAccounts)
		}
		if accounts[i].Plan == "team_member" && accounts[i].ParentID != nil {
			var parent db.Account
			if d.First(&parent, *accounts[i].ParentID).Error == nil {
				accounts[i].Parent = &parent
			}
		}
	}
	result.Items = accounts

	c.JSON(http.StatusOK, result)
}

func GetAccount(c *gin.Context) {
	var account db.Account
	d := db.GetDB()
	if err := d.First(&account, c.Param("id")).Error; err != nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "账号不存在"})
		return
	}
	if account.Plan == "team_owner" {
		d.Where("parent_id = ?", account.ID).Find(&account.SubAccounts)
	}
	c.JSON(http.StatusOK, account)
}

func CheckAccounts(c *gin.Context) {
	var req struct {
		IDs []uint `json:"ids" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	results := service.CheckAccountStatuses(db.GetDB(), req.IDs)
	c.JSON(http.StatusOK, gin.H{"message": "状态检查完成", "results": results})
}

func CheckSingleAccount(c *gin.Context) {
	id := c.Param("id")
	var uid uint
	if _, err := fmt.Sscanf(id, "%d", &uid); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的 ID"})
		return
	}
	results := service.CheckAccountStatuses(db.GetDB(), []uint{uid})
	if len(results) > 0 {
		c.JSON(http.StatusOK, results[0])
	} else {
		c.JSON(http.StatusNotFound, gin.H{"error": "账号不存在"})
	}
}

func TestModel(c *gin.Context) {
	var req struct {
		ID    uint   `json:"id" binding:"required"`
		Model string `json:"model"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	result := service.TestModelAvailability(db.GetDB(), req.ID, req.Model)
	c.JSON(http.StatusOK, result)
}

func UpdateAccountNote(c *gin.Context) {
	var req struct {
		Note string `json:"note"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}
	if err := db.GetDB().Model(&db.Account{}).Where("id = ?", c.Param("id")).Update("note", req.Note).Error; err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, gin.H{"message": "备注已更新"})
}

func TransferToCPA(c *gin.Context) {
	id := c.Param("id")
	var uid uint
	if _, err := fmt.Sscanf(id, "%d", &uid); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "无效的 ID"})
		return
	}
	result := service.TransferAccountToCPA(db.GetDB(), uid)
	if result.OK {
		c.JSON(http.StatusOK, result)
	} else {
		c.JSON(http.StatusInternalServerError, result)
	}
}

func ExportAccounts(c *gin.Context) {
	var req struct {
		IDs  []uint `json:"ids" binding:"required"`
		Note string `json:"note"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	data, filename, err := service.ExportAccounts(db.GetDB(), req.IDs, req.Note)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.Header("Content-Disposition", "attachment; filename=\""+filename+"\"")
	if len(req.IDs) > 1 {
		c.Data(http.StatusOK, "application/zip", data)
	} else {
		c.Data(http.StatusOK, "application/json", data)
	}
}