package httpapi

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

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

	"github.com/sundynix/pets-be/internal/model"
)

type petInput struct {
	Name         string  `json:"name" binding:"required"`
	Species      string  `json:"species"`
	Breed        string  `json:"breed"`
	Gender       string  `json:"gender"`
	BirthDate    string  `json:"birth_date"`
	WeightKg     float64 `json:"weight_kg"`
	AvatarFileID *string `json:"avatar_file_id"`
	Coat         string  `json:"coat"`
	Allergies    string  `json:"allergies"`
	CareNotes    string  `json:"care_notes"`
}

func (a *API) listPets(c *gin.Context) {
	var pets []model.Pet
	if err := a.db.Where("user_id = ? AND archived = false", actor(c)).Order("created_at ASC").Find(&pets).Error; err != nil {
		fail(c, http.StatusInternalServerError, "读取宠物失败")
		return
	}
	items := make([]gin.H, 0, len(pets))
	for _, pet := range pets {
		items = append(items, a.petView(pet))
	}
	ok(c, items)
}

func (a *API) getPet(c *gin.Context) {
	pet, err := a.ownedPet(actor(c), c.Param("id"))
	if err != nil {
		fail(c, http.StatusNotFound, "宠物不存在")
		return
	}
	ok(c, a.petView(pet))
}

func (a *API) createPet(c *gin.Context) {
	var in petInput
	if c.ShouldBindJSON(&in) != nil {
		fail(c, http.StatusBadRequest, "宠物资料无效")
		return
	}
	pet, valid := a.buildPet(c, in)
	if !valid {
		return
	}
	pet.UserID = actor(c)
	if err := a.db.Create(&pet).Error; err != nil {
		fail(c, http.StatusInternalServerError, "创建宠物失败")
		return
	}
	created(c, a.petView(pet))
}

func (a *API) updatePet(c *gin.Context) {
	pet, err := a.ownedPet(actor(c), c.Param("id"))
	if err != nil {
		fail(c, http.StatusNotFound, "宠物不存在")
		return
	}
	var in petInput
	if c.ShouldBindJSON(&in) != nil {
		fail(c, http.StatusBadRequest, "宠物资料无效")
		return
	}
	updated, valid := a.buildPet(c, in)
	if !valid {
		return
	}
	pet.Name, pet.Species, pet.Breed, pet.Gender = updated.Name, updated.Species, updated.Breed, updated.Gender
	pet.BirthDate, pet.WeightKg, pet.AvatarFileID = updated.BirthDate, updated.WeightKg, updated.AvatarFileID
	pet.Coat, pet.Allergies, pet.CareNotes = updated.Coat, updated.Allergies, updated.CareNotes
	if err := a.db.Save(&pet).Error; err != nil {
		fail(c, http.StatusInternalServerError, "更新宠物失败")
		return
	}
	ok(c, a.petView(pet))
}

func (a *API) buildPet(c *gin.Context, in petInput) (model.Pet, bool) {
	pet := model.Pet{}
	in.Name = strings.TrimSpace(in.Name)
	if in.Name == "" || len([]rune(in.Name)) > 64 || in.WeightKg < 0 || in.WeightKg > 200 {
		fail(c, http.StatusBadRequest, "名字或体重无效")
		return pet, false
	}
	if in.Species == "" {
		in.Species = "dog"
	}
	if in.Species != "dog" && in.Species != "cat" && in.Species != "other" {
		fail(c, http.StatusBadRequest, "宠物类型无效")
		return pet, false
	}
	if in.AvatarFileID != nil {
		var count int64
		if !validID(*in.AvatarFileID) || a.db.Model(&model.File{}).Where("id = ?", *in.AvatarFileID).Count(&count).Error != nil || count == 0 {
			fail(c, http.StatusBadRequest, "头像文件无效")
			return pet, false
		}
	}
	var birthday *time.Time
	if in.BirthDate != "" {
		d, err := parseDay(in.BirthDate)
		if err != nil || d.After(time.Now()) {
			fail(c, http.StatusBadRequest, "生日无效")
			return pet, false
		}
		birthday = &d
	}
	pet = model.Pet{Name: in.Name, Species: in.Species, Breed: strings.TrimSpace(in.Breed),
		Gender: in.Gender, BirthDate: birthday, WeightKg: in.WeightKg,
		AvatarFileID: in.AvatarFileID, Coat: in.Coat, Allergies: in.Allergies, CareNotes: in.CareNotes}
	return pet, true
}

func (a *API) archivePet(c *gin.Context) {
	pet, err := a.ownedPet(actor(c), c.Param("id"))
	if err != nil {
		fail(c, http.StatusNotFound, "宠物不存在")
		return
	}
	var active int64
	if err := a.db.Table("sundynix_walk_pet AS wp").Joins("JOIN sundynix_walk AS w ON w.id = wp.walk_id").
		Where("wp.pet_id = ? AND w.status IN ?", pet.ID, []string{"active", "paused"}).Count(&active).Error; err != nil {
		fail(c, http.StatusInternalServerError, "检查遛狗状态失败")
		return
	}
	if active > 0 {
		fail(c, http.StatusConflict, "这只宠物正在遛狗，结束后再归档")
		return
	}
	if err := a.db.Model(&model.Pet{}).Where("id = ? AND user_id = ?", pet.ID, actor(c)).Update("archived", true).Error; err != nil && err != gorm.ErrRecordNotFound {
		fail(c, http.StatusInternalServerError, "归档失败")
		return
	}
	ok(c, gin.H{"archived": true})
}