package gas

import (
	"strings"

	"git.apinb.com/bsm-sdk/core/crypto/token"
	"git.apinb.com/bsm-sdk/core/env"
	"git.apinb.com/bsm-sdk/core/errcode"
	"git.apinb.com/bsm-sdk/core/infra"
	"git.apinb.com/bsm-sdk/core/middleware"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/impl"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/logic/common"
	"git.apinb.com/heqiapp/platforms/backend/api/internal/models"
	"github.com/gin-gonic/gin"
	"golang.org/x/crypto/bcrypt"
	"gorm.io/gorm"
)

type loginRequest struct {
	Username string `json:"username" binding:"required,max=64"`
	Password string `json:"password" binding:"required"`
}

// Login 校验气站账号并签发独立 gas_admin JWT。
func Login(ctx *gin.Context) {
	var request loginRequest
	if err := ctx.ShouldBindJSON(&request); err != nil {
		infra.Response.Error(ctx, errcode.ErrInvalidArgument)
		return
	}
	var account models.GasAccount
	err := impl.DBService.Where("username = ?", strings.TrimSpace(request.Username)).First(&account).Error
	if err != nil {
		infra.Response.Error(ctx, errcode.ErrPassword)
		return
	}
	var station models.GasBasic
	if account.Status != common.StatusEnable || account.RoleCode != "admin" ||
		impl.DBService.First(&station, account.GasBasicID).Error != nil || station.Status != common.StatusEnable ||
		bcrypt.CompareHashAndPassword([]byte(account.PasswordHash), []byte(request.Password)) != nil {
		infra.Response.Error(ctx, errcode.ErrPassword)
		return
	}
	accessToken, err := token.New(env.Runtime.JwtSecretKey).GenerateJwt(
		0, account.Identity, "gas_admin", account.RoleCode, nil,
		map[string]string{"gas_basic_identity": station.Identity, "username": account.Username, "display_name": account.DisplayName},
	)
	if err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	infra.Response.Success(ctx, gin.H{
		"access_token": accessToken, "token_type": "JWT", "identity": account.Identity,
		"display_name": account.DisplayName, "role_code": account.RoleCode, "gas_basic_identity": station.Identity,
	})
}

// RequireGasAdmin 拒绝平台令牌和非本站管理员令牌。
func RequireGasAdmin() gin.HandlerFunc {
	return func(ctx *gin.Context) {
		claims, err := middleware.ParseAuth(ctx)
		if err != nil || claims.Client != "gas_admin" || claims.Role != "admin" || claims.Extend["gas_basic_identity"] == "" {
			infra.Response.Error(ctx, errcode.ErrPermissionDenied)
			ctx.Abort()
			return
		}
		var count int64
		err = impl.DBService.Model(&models.GasAccount{}).
			Joins("JOIN gas_basic ON gas_basic.id = gas_account.gas_basic_id").
			Where("gas_account.identity = ? AND gas_account.status = ? AND gas_account.role_code = ? AND gas_basic.identity = ? AND gas_basic.status = ?",
				claims.Identity, common.StatusEnable, "admin", claims.Extend["gas_basic_identity"], common.StatusEnable).
			Count(&count).Error
		if err != nil || count != 1 {
			infra.Response.Error(ctx, errcode.ErrPermissionDenied)
			ctx.Abort()
			return
		}
		ctx.Next()
	}
}

// CurrentProfile 返回气站账号、所属气站和菜单。
func CurrentProfile(ctx *gin.Context) {
	account, station, ok := CurrentGasAccount(ctx)
	if !ok {
		return
	}
	menus := MenusForRole(account.RoleCode)
	menuCodes := make([]string, 0, len(menus))
	for _, menu := range menus {
		menuCodes = append(menuCodes, menu.Identity)
	}
	infra.Response.Success(ctx, gin.H{
		"identity": account.Identity, "username": account.Username, "display_name": account.DisplayName,
		"role_code": account.RoleCode, "gas_basic_identity": station.Identity, "gas_basic_name": station.Name,
		"menu_codes": menuCodes,
	})
}

// ChangePassword 修改当前气站账号密码。
func ChangePassword(ctx *gin.Context) {
	var request struct {
		CurrentPassword string `json:"current_password" binding:"required"`
		NewPassword     string `json:"new_password" binding:"required"`
	}
	if err := ctx.ShouldBindJSON(&request); err != nil || !common.IsValidAccountPassword(request.NewPassword) {
		infra.Response.Error(ctx, errcode.ErrInvalidArgument)
		return
	}
	claims, _ := middleware.ParseAuth(ctx)
	var account models.GasAccount
	if err := impl.DBService.Where("identity = ?", claims.Identity).First(&account).Error; err != nil {
		infra.Response.Error(ctx, errcode.ErrRecordNotFound)
		return
	}
	if bcrypt.CompareHashAndPassword([]byte(account.PasswordHash), []byte(request.CurrentPassword)) != nil {
		infra.Response.Error(ctx, errcode.ErrPassword)
		return
	}
	hash, err := common.PasswordHash(request.NewPassword)
	if err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	if err := impl.DBService.Model(&account).Update("password_hash", hash).Error; err != nil {
		infra.Response.Error(ctx, err)
		return
	}
	infra.Response.Success(ctx, gin.H{"changed": true})
}

// CurrentGasAccount 解析当前账户和气站。
func CurrentGasAccount(ctx *gin.Context) (models.GasAccount, models.GasBasic, bool) {
	claims, err := middleware.ParseAuth(ctx)
	if err != nil {
		infra.Response.Error(ctx, err)
		return models.GasAccount{}, models.GasBasic{}, false
	}
	var account models.GasAccount
	if err := impl.DBService.Where("identity = ?", claims.Identity).First(&account).Error; err != nil {
		if err == gorm.ErrRecordNotFound {
			infra.Response.Error(ctx, errcode.ErrRecordNotFound)
		} else {
			infra.Response.Error(ctx, err)
		}
		return models.GasAccount{}, models.GasBasic{}, false
	}
	var station models.GasBasic
	if err := impl.DBService.First(&station, account.GasBasicID).Error; err != nil {
		infra.Response.Error(ctx, errcode.ErrRecordNotFound)
		return models.GasAccount{}, models.GasBasic{}, false
	}
	return account, station, true
}