package handler

import (
	"net/http"
	"strings"
	"time"

	"bj_power_workstation/internal/auth"
	"bj_power_workstation/internal/svc"

	"golang.org/x/crypto/bcrypt"
)

func healthHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		if err := ctx.Store.Ping(); err == nil {
			ok(w, map[string]any{
				"status":  "UP",
				"time":    time.Now().Format("2006-01-02 15:04:05"),
				"service": "bj_power_workstation",
			})
			return
		}
		fail(w, http.StatusServiceUnavailable, "本地数据库不可用")
	}
}

// loginHandler 本地 SQLite + bcrypt 校验登录，返回 {token, expireAt, user}。
// 账号自动记录为操作人（前端通过 localStorage 的 user 保存操作人）。
func loginHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Username string `json:"username"`
			Password string `json:"password"`
		}
		if err := parseJSON(r, &req); err != nil {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		if strings.TrimSpace(req.Username) == "" || req.Password == "" {
			fail(w, http.StatusBadRequest, "用户名和密码必填")
			return
		}

		u, err := ctx.Store.GetUserByUsername(strings.TrimSpace(req.Username))
		if err != nil {
			fail(w, http.StatusUnauthorized, "用户名或密码错误")
			return
		}
		if bcrypt.CompareHashAndPassword([]byte(u.PasswordHash), []byte(req.Password)) != nil {
			fail(w, http.StatusUnauthorized, "用户名或密码错误")
			return
		}

		token, expireAt, err := auth.SignToken(
			ctx.Config.Auth.AccessSecret,
			ctx.Config.Auth.AccessExpire,
			auth.TokenInfo{UserID: u.ID, Username: u.Username, RealName: u.RealName, Role: u.Role},
		)
		if err != nil {
			fail(w, http.StatusInternalServerError, "签发 token 失败")
			return
		}

		ctx.Store.AddEventLog("", u.RealName, "login", "账号登录")
		ok(w, map[string]any{
			"token":    token,
			"expireAt": expireAt,
			"user": map[string]any{
				"id":       u.ID,
				"username": u.Username,
				"realName": u.RealName,
				"role":     u.Role,
			},
		})
	}
}

// configHandler GET /api/config 返回工位配置：
// 固定工位号（Station.Code 为空则前端可自选）、本工位需拧紧的螺丝颗数。
func configHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		ok(w, map[string]any{
			"station":    ctx.Config.Station.Code,
			"screwCount": ctx.Config.Station.ScrewCount,
		})
	}
}