package handler

import (
	"time"

	"github.com/gin-gonic/gin"
	"gorm.io/datatypes"

	"github.com/sundynix/pets-be/internal/middleware"
	"github.com/sundynix/pets-be/internal/model"
	"github.com/sundynix/pets-be/internal/service"
	"github.com/sundynix/pets-be/pkg/response"
)

type petReq struct {
	Name         string   `json:"name"`
	Emoji        string   `json:"emoji"`
	Type         string   `json:"type"`
	Gender       string   `json:"gender"`
	Birthday     string   `json:"birthday"`   // YYYY-MM-DD
	ArrivedAt    string   `json:"arrived_at"` // YYYY-MM-DD，到家日期
	Weight       string   `json:"weight"`
	Stage        string   `json:"stage"`
	Age          string   `json:"age"`
	Color        string   `json:"color"`
	Breed        string   `json:"breed"`
	AvatarFileID string   `json:"avatar_file_id"`
	Goals        []string `json:"goals"`
}

func (r petReq) toInput() service.PetInput {
	in := service.PetInput{
		Name: r.Name, Emoji: r.Emoji, Type: r.Type, Gender: r.Gender,
		Weight: r.Weight, Stage: r.Stage, Age: r.Age, Color: r.Color, Breed: r.Breed,
		AvatarFileID: r.AvatarFileID,
	}
	if r.Birthday != "" {
		if t, err := time.ParseInLocation("2006-01-02", r.Birthday, time.Local); err == nil {
			// 生日不接受未来日期：前端限制过一道，服务端不能只信前端
			if !t.After(time.Now()) {
				in.Birthday = &t
			}
		}
	}
	if r.ArrivedAt != "" {
		if t, err := time.ParseInLocation("2006-01-02", r.ArrivedAt, time.Local); err == nil && !t.After(time.Now()) {
			in.ArrivedAt = &t
		}
	}
	// 阶段归一化不在这里做：狗要按品种查体型才能定阈值，需要访问 DB。
	// 交给 handler 里 h.svc.NormalizeStage 处理。
	if r.Goals != nil {
		if b, err := jsonMarshal(r.Goals); err == nil {
			in.Goals = datatypes.JSON(b)
		}
	}
	return in
}

// ListPets GET /api/pets
func (h *Handler) ListPets(c *gin.Context) {
	pets, err := h.svc.ListPets(middleware.UserID(c))
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, pets)
}

// CreatePet POST /api/pets
func (h *Handler) CreatePet(c *gin.Context) {
	var req petReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	in := req.toInput()
	in.Stage = h.svc.NormalizeStage(service.SpeciesOf(req.Type), req.Breed, in.Stage, in.Birthday)
	pet, err := h.svc.CreatePet(middleware.UserID(c), in)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, pet)
}

// GetPet GET /api/pets/:id
func (h *Handler) GetPet(c *gin.Context) {
	pet, err := h.svc.GetPet(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, pet)
}

// UpdatePet PUT /api/pets/:id
func (h *Handler) UpdatePet(c *gin.Context) {
	var req petReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	fields := map[string]any{}
	if req.Name != "" {
		fields["name"] = req.Name
	}
	if req.Emoji != "" {
		fields["emoji"] = req.Emoji
	}
	if req.Weight != "" {
		fields["weight"] = req.Weight
	}
	if req.Stage != "" {
		fields["stage"] = req.Stage
	}
	if req.Gender != "" {
		fields["gender"] = req.Gender
	}
	if req.Age != "" {
		fields["age"] = req.Age
	}
	if req.Color != "" {
		fields["color"] = req.Color
	}
	if req.Breed != "" {
		fields["breed"] = req.Breed
	}
	if req.AvatarFileID != "" {
		fields["avatar_file_id"] = req.AvatarFileID
	}
	pet, err := h.svc.UpdatePet(middleware.UserID(c), idParam(c, "id"), fields)
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, pet)
}

// DeletePet DELETE /api/pets/:id
func (h *Handler) DeletePet(c *gin.Context) {
	if err := h.svc.DeletePet(middleware.UserID(c), idParam(c, "id")); err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, gin.H{"deleted": true})
}

// Onboarding POST /api/onboarding
func (h *Handler) Onboarding(c *gin.Context) {
	var req petReq
	if err := c.ShouldBindJSON(&req); err != nil {
		response.FailParams(c, err.Error())
		return
	}
	in := req.toInput()
	in.Stage = h.svc.NormalizeStage(service.SpeciesOf(req.Type), req.Breed, in.Stage, in.Birthday)
	pet, err := h.svc.Onboarding(middleware.UserID(c), in)
	if err != nil {
		response.FailErr(c, err)
		return
	}
	response.OK(c, pet)
}

// Breeds GET /api/breeds?species=cat 品种，按首字母分组。
// 建档第二步的选择器直接照这个渲染，前端不做分组也不做排序
func (h *Handler) Breeds(c *gin.Context) {
	response.OK(c, h.svc.ListBreeds(c.Query("species")))
}

// LifeStages GET /api/life-stages?species=dog&size=large
// 生命阶段的划分标准。建档时选阶段那里、和「该换方案了」的提示里都要展示依据，
// 所以直接把驱动判定的那张表吐出来 —— 不另写一份说明文案，免得两边漂
func (h *Handler) LifeStages(c *gin.Context) {
	species := c.Query("species")
	if species == "" {
		species = model.SpeciesCat
	}
	response.OK(c, gin.H{
		"species": species,
		"size":    c.Query("size"),
		"stages":  service.StageRules(species, c.Query("size")),
		"sizes":   service.SizeLabels,
	})
}

// PetStageDrift GET /api/pets/:id/stage-drift
// 存的阶段和按生日算的对不上时，告诉前端可以提示用户换一套方案
func (h *Handler) PetStageDrift(c *gin.Context) {
	pet, err := h.svc.GetPet(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, h.svc.CheckStageDrift(pet))
}

// PetIDCard GET /api/pets/:id/id-card 宠物身份卡内容（含小程序码，未发布时无码）
func (h *Handler) PetIDCard(c *gin.Context) {
	card, err := h.svc.GetIDCard(middleware.UserID(c), idParam(c, "id"))
	if err != nil {
		respondErr(c, err)
		return
	}
	response.OK(c, card)
}