package handler

import (
	"net/http"
	"strings"

	"bj_power_wms/ent"
	"bj_power_wms/ent/permission"
	"bj_power_wms/ent/role"
	"bj_power_wms/ent/user"
	"bj_power_wms/internal/svc"

	"github.com/zeromicro/go-zero/core/logx"
)

// 种子权限定义：MENU=菜单权限(对应侧栏，path 为路由)；BUTTON=按钮级权限(页面内操作)
type seedPerm struct {
	Code string
	Name string
	Type string
	Path string
	Icon string
	Sort int
	// Parent 按钮所属菜单编码(BUTTON 填其所属 MENU code；导出等按钮已按菜单拆分，不再用全局 *)
	Parent string
}

var seedPermissions = []seedPerm{
	// ===== 菜单权限 =====
	{"dashboard:view", "工作台", "MENU", "/", "HomeFilled", 10, ""},
	{"inbound:view", "入库管理", "MENU", "/inbound", "Download", 20, ""},
	{"outbound:view", "出库管理", "MENU", "/outbound", "Upload", 30, ""},
	{"inventory:view", "库存查询", "MENU", "/inventory", "Search", 40, ""},
	{"inspection:view", "质量检验", "MENU", "/inspection", "CircleCheck", 50, ""},
	{"stocktake:view", "库存盘点", "MENU", "/stocktake", "List", 60, ""},
	{"semi:view", "半成品/成品", "MENU", "/semi", "Box", 70, ""},
	{"ledger:view", "备料台账", "MENU", "/ledger", "Tickets", 80, ""},
	{"zone:view", "区域维护", "MENU", "/zone", "Location", 90, ""},
	{"material:view", "物料档案", "MENU", "/material", "Goods", 100, ""},
	{"user:manage", "账号管理", "MENU", "/users", "EditPen", 110, ""},
	{"role:manage", "角色管理", "MENU", "/roles", "Key", 120, ""},
	// ===== 按钮权限 =====
	{"inbound:create", "批量入库", "BUTTON", "", "", 200, "inbound:view"},
	{"inbound:import", "Excel导入", "BUTTON", "", "", 201, "inbound:view"},
	{"inbound:export", "导出", "BUTTON", "", "", 202, "inbound:view"},
	{"outbound:create", "发起出库", "BUTTON", "", "", 210, "outbound:view"},
	{"outbound:export", "导出", "BUTTON", "", "", 211, "outbound:view"},
	{"inspection:create", "录入检验", "BUTTON", "", "", 220, "inspection:view"},
	{"inspection:export", "导出", "BUTTON", "", "", 221, "inspection:view"},
	{"inventory:export", "导出", "BUTTON", "", "", 204, "inventory:view"},
	{"stocktake:start", "发起盘点", "BUTTON", "", "", 230, "stocktake:view"},
	{"stocktake:writeback", "差异写回", "BUTTON", "", "", 231, "stocktake:view"},
	{"material:create", "新增物料", "BUTTON", "", "", 240, "material:view"},
	{"material:edit", "编辑物料", "BUTTON", "", "", 241, "material:view"},
	{"material:delete", "删除物料", "BUTTON", "", "", 242, "material:view"},
	{"material:import", "导入", "BUTTON", "", "", 243, "material:view"},
	{"material:export", "导出", "BUTTON", "", "", 244, "material:view"},
	{"zone:create", "新增区域", "BUTTON", "", "", 250, "zone:view"},
	{"zone:edit", "编辑区域", "BUTTON", "", "", 251, "zone:view"},
	{"zone:delete", "删除区域", "BUTTON", "", "", 252, "zone:view"},
	{"user:create", "新增账号", "BUTTON", "", "", 260, "user:manage"},
	{"user:edit", "编辑账号", "BUTTON", "", "", 261, "user:manage"},
	{"user:delete", "删除账号", "BUTTON", "", "", 262, "user:manage"},
	{"role:create", "新增角色", "BUTTON", "", "", 270, "role:manage"},
	{"role:edit", "编辑角色", "BUTTON", "", "", 271, "role:manage"},
	{"role:delete", "删除角色", "BUTTON", "", "", 272, "role:manage"},
	// 注：导出权限已按菜单拆分（inbound/outbound/inspection/inventory:export），
	// 不再使用全局 *:export，以更精细地控制“谁能在哪个菜单导出”。
}

// 三角色预置权限（对齐原硬编码 rolePermissions，并补充按钮权限）
// admin 全量；operator 除账号/角色管理外全部；inspector 仅质检相关
func seedRoleCodes() map[string][]string {
	all := make([]string, 0, len(seedPermissions))
	for _, p := range seedPermissions {
		all = append(all, p.Code)
	}
	oper := make([]string, 0, len(seedPermissions))
	for _, p := range seedPermissions {
		if p.Code == "user:manage" || p.Code == "role:manage" ||
			p.Code == "user:create" || p.Code == "user:edit" || p.Code == "user:delete" ||
			p.Code == "role:create" || p.Code == "role:edit" || p.Code == "role:delete" {
			continue
		}
		oper = append(oper, p.Code)
	}
	insp := []string{
		"dashboard:view", "inventory:view", "inspection:view", "inspection:create",
		"stocktake:view", "ledger:view", "zone:view", "material:view",
		"inventory:export", "inspection:export", "material:export",
	}
	return map[string][]string{"admin": all, "operator": oper, "inspector": insp}
}

var seedRoleMeta = []struct {
	Code   string
	Name   string
	Remark string
}{
	{"admin", "管理员", "系统管理员，拥有全部权限"},
	{"operator", "库房保管员", "入库/出库/库存/盘点等日常作业"},
	{"inspector", "质检员", "质量检验相关"},
}

// seedRbacHandler POST /api/rbac/seed 幂等初始化权限与角色（已存在按 code 跳过）
func seedRbacHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requireAdmin(func(w http.ResponseWriter, r *http.Request) {
		createdP, createdR := 0, 0
		for _, p := range seedPermissions {
			exist, _ := ctx.EntClient.Permission.Query().
				Where(permission.CodeEQ(p.Code)).Exist(ctx0())
			if exist {
				// 已存在：幂等补齐 parent_code（新增字段不影响已建角色权限）
				_, _ = ctx.EntClient.Permission.Update().
					Where(permission.CodeEQ(p.Code)).
					SetParentCode(p.Parent).
					Save(ctx0())
				continue
			}
			_, err := ctx.EntClient.Permission.Create().
				SetCode(p.Code).SetName(p.Name).SetType(p.Type).
				SetParentCode(p.Parent).
				SetPath(p.Path).SetIcon(p.Icon).SetSort(p.Sort).
				Save(ctx0())
			if err == nil {
				createdP++
			}
		}
		codes := seedRoleCodes()
		bound := 0
		for _, m := range seedRoleMeta {
			rl, err := ctx.EntClient.Role.Query().
				Where(role.CodeEQ(m.Code)).Only(ctx0())
			if err != nil {
				// 内置角色不存在则创建
				rl, err = ctx.EntClient.Role.Create().
					SetCode(m.Code).SetName(m.Name).SetRemark(m.Remark).
					SetPermissionCodes(codes[m.Code]).
					Save(ctx0())
				if err != nil {
					continue
				}
				createdR++
			}
			// 把「role 字符串 == 该角色 code」的历史用户绑定到 role_id（幂等，仅绑定 role_id 为空者）
			users, _ := ctx.EntClient.User.Query().
				Where(user.RoleEQ(m.Code), user.RoleIDIsNil()).All(ctx0())
			for _, u := range users {
				if _, err := ctx.EntClient.User.UpdateOneID(u.ID).SetRoleID(rl.ID).Save(ctx0()); err == nil {
					bound++
				}
			}
		}
		// 迁移历史角色：把“可查看的菜单”自动补上对应导出码（精细化：原全局 *:export 等价于“可见菜单均可导出”）
		// 同时清理可能残留的废弃 *:export。已有角色 seed 不会覆盖，故在此补齐导出能力。
		menuExport := map[string]string{}
		for _, p := range seedPermissions {
			if p.Type == "BUTTON" && p.Parent != "" && p.Name == "导出" {
				menuExport[p.Parent] = p.Code
			}
		}
		allRoles, _ := ctx.EntClient.Role.Query().All(ctx0())
		for _, rl := range allRoles {
			codes := rl.PermissionCodes
			changed := false
			set := map[string]bool{}
			for _, c := range codes {
				if c == "*:export" {
					changed = true // 移除废弃全局码
					continue
				}
				set[c] = true
			}
			for c := range set {
				if strings.HasSuffix(c, ":view") {
					// c 本身就是菜单权限码(如 inbound:view)，与 menuExport 的 key 一致
					if exp, ok := menuExport[c]; ok && !set[exp] {
						set[exp] = true
						changed = true
					}
				}
			}
			if !changed {
				continue
			}
			newCodes := make([]string, 0, len(set))
			for c := range set {
				newCodes = append(newCodes, c)
			}
			_, _ = ctx.EntClient.Role.UpdateOneID(rl.ID).SetPermissionCodes(newCodes).Save(ctx0())
		}
		// 强制管理员角色始终拥有全部权限（不允许被缩减），与“admin 拥有所有权限”一致
		if adminRole, aerr := ctx.EntClient.Role.Query().Where(role.CodeEQ("admin")).Only(ctx0()); aerr == nil {
			_ = ctx.EntClient.Role.UpdateOneID(adminRole.ID).SetPermissionCodes(codes["admin"]).Exec(ctx0())
		}
		// 清理已废弃的全局 *:export 权限行（迁移后无角色引用，幂等）
		_, _ = ctx.EntClient.Permission.Delete().Where(permission.CodeEQ("*:export")).Exec(ctx0())

		logx.Infof("rbac seed: 新增权限 %d 条、角色 %d 个、绑定历史用户 %d 个", createdP, createdR, bound)
		ok(w, map[string]any{"createdPermissions": createdP, "createdRoles": createdR, "boundUsers": bound})
	})
}

// listRolesHandler GET /api/roles 角色列表（含权限码）
func listRolesHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requirePerm(ctx, "role:manage", func(w http.ResponseWriter, r *http.Request) {
		list, err := ctx.EntClient.Role.Query().Order(ent.Asc("id")).All(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, map[string]any{"list": list})
	})
}

// createRoleHandler POST /api/roles 新增角色
func createRoleHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requirePerm(ctx, "role:create", func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			Name            string   `json:"name"`
			Code            string   `json:"code"`
			Remark          string   `json:"remark"`
			PermissionCodes []string `json:"permissionCodes"`
		}
		if err := parseJSON(r, &req); err != nil || req.Code == "" || req.Name == "" {
			fail(w, http.StatusBadRequest, "角色名称与编码必填")
			return
		}
		exist, _ := ctx.EntClient.Role.Query().Where(role.CodeEQ(req.Code)).Exist(ctx0())
		if exist {
			fail(w, http.StatusConflict, "角色编码已存在: "+req.Code)
			return
		}
		codes := req.PermissionCodes
		if codes == nil {
			codes = []string{}
		}
		rl, err := ctx.EntClient.Role.Create().
			SetName(req.Name).SetCode(req.Code).
			SetNillableRemark(strPtr(req.Remark)).
			SetPermissionCodes(codes).Save(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, rl)
	})
}

// updateRoleHandler POST /api/roles/update 编辑角色（含权限勾选）
func updateRoleHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requirePerm(ctx, "role:edit", func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			ID              int      `json:"id"`
			Name            string   `json:"name"`
			Remark          string   `json:"remark"`
			PermissionCodes []string `json:"permissionCodes"`
		}
		if err := parseJSON(r, &req); err != nil || req.ID <= 0 {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		// 内置管理员角色不允许修改其权限（admin 拥有所有权限，且不可被缩减）
		target, err := ctx.EntClient.Role.Get(ctx0(), req.ID)
		if err != nil {
			fail(w, http.StatusNotFound, "角色不存在")
			return
		}
		if target.Code == "admin" {
			fail(w, http.StatusBadRequest, "内置管理员角色不允许修改其权限")
			return
		}
		// 角色编码创建后不可修改（前端亦置灰），此处只改名称/备注/权限
		upd := ctx.EntClient.Role.UpdateOneID(req.ID)
		if req.Name != "" {
			upd = upd.SetName(req.Name)
		}
		if req.Remark != "" {
			upd = upd.SetRemark(req.Remark)
		}
		if req.PermissionCodes != nil {
			upd = upd.SetPermissionCodes(req.PermissionCodes)
		}
		rl, err := upd.Save(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, rl)
	})
}

// deleteRoleHandler POST /api/roles/delete 删除角色（内置三角色禁止删除）
func deleteRoleHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return requirePerm(ctx, "role:delete", func(w http.ResponseWriter, r *http.Request) {
		var req struct {
			ID int `json:"id"`
		}
		if err := parseJSON(r, &req); err != nil || req.ID <= 0 {
			fail(w, http.StatusBadRequest, "参数错误")
			return
		}
		target, err := ctx.EntClient.Role.Get(ctx0(), req.ID)
		if err != nil {
			fail(w, http.StatusNotFound, "角色不存在")
			return
		}
		if target.Code == "admin" || target.Code == "operator" || target.Code == "inspector" {
			fail(w, http.StatusBadRequest, "内置角色不可删除: "+target.Code)
			return
		}
		if err := ctx.EntClient.Role.DeleteOneID(req.ID).Exec(ctx0()); err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, nil)
	})
}

// listPermissionsHandler GET /api/permissions 权限列表（菜单+按钮，按 sort 排序）
func listPermissionsHandler(ctx *svc.ServiceContext) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		list, err := ctx.EntClient.Permission.Query().
			Order(ent.Asc("sort"), ent.Asc("id")).All(ctx0())
		if err != nil {
			fail(w, http.StatusInternalServerError, err.Error())
			return
		}
		ok(w, map[string]any{"list": list})
	}
}