package web

import (
	"net/http"
	"strconv"
	"strings"

	"daili/internal/domain"
	"daili/internal/store"
)

type packagesData struct {
	List []store.Package
}

func (s *Server) handlePackages(w http.ResponseWriter, r *http.Request) {
	list, err := s.db.ListPackages(true)
	if err != nil {
		http.Error(w, "读取套餐失败", http.StatusInternalServerError)
		return
	}
	p := s.newPage(r, "套餐", "packages")
	p.D = &packagesData{List: list}
	s.render(w, r, "packages", p)
}

type packageFormData struct {
	Package *store.Package
	IsNew   bool
}

func (s *Server) handlePackageNewPage(w http.ResponseWriter, r *http.Request) {
	p := s.newPage(r, "新增套餐", "packages")
	p.D = &packageFormData{
		Package: &store.Package{Unit: domain.UnitDay, DefaultAmount: 30, Color: "#2F5D50"},
		IsNew:   true,
	}
	s.render(w, r, "package_form", p)
}

func readPackageForm(r *http.Request) *store.Package {
	p := &store.Package{
		Name:          strings.TrimSpace(r.PostFormValue("name")),
		Unit:          strings.TrimSpace(r.PostFormValue("unit")),
		DefaultAmount: 0,
		Color:         strings.TrimSpace(r.PostFormValue("color")),
		Note:          strings.TrimSpace(r.PostFormValue("note")),
		SortOrder:     0,
	}
	if v, err := strconv.Atoi(strings.TrimSpace(r.PostFormValue("default_amount"))); err == nil {
		p.DefaultAmount = v
	}
	if v, err := strconv.Atoi(strings.TrimSpace(r.PostFormValue("sort_order"))); err == nil {
		p.SortOrder = v
	}
	if price := strings.TrimSpace(r.PostFormValue("price")); price != "" {
		if f, err := strconv.ParseFloat(price, 64); err == nil {
			p.PriceCents = int(f*100 + 0.5)
			p.HasPrice = true
		}
	}
	if p.Unit == "" {
		p.Unit = domain.UnitDay
	}
	return p
}

func validatePackage(p *store.Package) string {
	if p.Name == "" {
		return "套餐名称不能为空"
	}
	if len([]rune(p.Name)) > 32 {
		return "套餐名称最长 32 字"
	}
	if p.Unit != domain.UnitDay && p.Unit != domain.UnitCount {
		return "套餐类型不正确"
	}
	if p.DefaultAmount <= 0 {
		return "默认天数/次数必须大于 0"
	}
	if p.Color == "" || !strings.HasPrefix(p.Color, "#") {
		return "请选择套餐颜色"
	}
	return ""
}

func (s *Server) handlePackageCreate(w http.ResponseWriter, r *http.Request) {
	pkg := readPackageForm(r)
	p := s.newPage(r, "新增套餐", "packages")
	if msg := validatePackage(pkg); msg != "" {
		p.D = &packageFormData{Package: pkg, IsNew: true}
		s.fail(w, r, "package_form", msg, p)
		return
	}
	id, err := s.db.CreatePackage(pkg)
	if err != nil {
		p.D = &packageFormData{Package: pkg, IsNew: true}
		s.fail(w, r, "package_form", "保存失败："+err.Error(), p)
		return
	}
	s.logOp(r, "新增套餐", "package", id, "新增套餐 "+pkg.Name)
	s.redirect(w, r, "/packages", "套餐已创建，现在可以给客户开通了")
}

func (s *Server) handlePackageEditPage(w http.ResponseWriter, r *http.Request) {
	id := pathID(r)
	pkg, err := s.db.Package(id)
	if err != nil {
		http.NotFound(w, r)
		return
	}
	p := s.newPage(r, "编辑套餐", "packages")
	p.D = &packageFormData{Package: pkg, IsNew: false}
	s.render(w, r, "package_form", p)
}

func (s *Server) handlePackageUpdate(w http.ResponseWriter, r *http.Request) {
	id := pathID(r)
	pkg := readPackageForm(r)
	pkg.ID = id
	p := s.newPage(r, "编辑套餐", "packages")
	if msg := validatePackage(pkg); msg != "" {
		p.D = &packageFormData{Package: pkg, IsNew: false}
		s.fail(w, r, "package_form", msg, p)
		return
	}
	if err := s.db.UpdatePackage(pkg); err != nil {
		p.D = &packageFormData{Package: pkg, IsNew: false}
		s.fail(w, r, "package_form", "保存失败："+err.Error(), p)
		return
	}
	s.logOp(r, "编辑套餐", "package", id, "修改套餐 "+pkg.Name)
	s.redirect(w, r, "/packages", "套餐已保存")
}

func (s *Server) handlePackageArchive(w http.ResponseWriter, r *http.Request) {
	id := pathID(r)
	pkg, err := s.db.Package(id)
	if err != nil {
		http.NotFound(w, r)
		return
	}
	archived := !pkg.Archived
	if err := s.db.SetPackageArchived(id, archived); err != nil {
		s.redirect(w, r, "/packages", "操作失败："+err.Error())
		return
	}
	action := "归档套餐"
	msg := "套餐已归档，不再允许新订阅（已有订阅不受影响）"
	if !archived {
		action = "取消归档"
		msg = "套餐已恢复"
	}
	s.logOp(r, action, "package", id, action+" "+pkg.Name)
	s.redirect(w, r, "/packages", msg)
}