package admin

import (
	"net/http"
	"strconv"

	"github.com/gin-gonic/gin"
	"github.com/shopspring/decimal"
	"go.uber.org/zap"
	"gorm.io/gorm"

	"openteam/server/internal/pkg/httpx"
	"openteam/server/internal/store"
)

type modelHandler struct {
	db  *gorm.DB
	log *zap.Logger
}

type modelInput struct {
	Name            string `json:"name" binding:"required"`
	DisplayName     string `json:"displayName"`
	InputPrice      string `json:"inputPrice"`
	OutputPrice     string `json:"outputPrice"`
	CacheReadPrice  string `json:"cacheReadPrice"`
	Enabled         *bool  `json:"enabled"`
	Sort            *int   `json:"sort"`
}

// List handles GET /api/v1/admin/models.
func (h *modelHandler) List(c *gin.Context) {
	var models []store.Model
	if err := h.db.Order("sort ASC, id ASC").Find(&models).Error; err != nil {
		h.log.Warn("list models failed", zap.Error(err))
		httpx.Fail(c, http.StatusInternalServerError, "list models failed")
		return
	}
	out := make([]gin.H, 0, len(models))
	for i := range models {
		out = append(out, modelDTO(&models[i]))
	}
	httpx.OK(c, out)
}

// Create handles POST /api/v1/admin/models.
func (h *modelHandler) Create(c *gin.Context) {
	var in modelInput
	if !httpx.Bind(c, &in) {
		return
	}
	m := &store.Model{
		Name:        in.Name,
		DisplayName: in.DisplayName,
		InputPrice:      parsePrice(in.InputPrice),
		OutputPrice:     parsePrice(in.OutputPrice),
		CacheReadPrice:  parsePrice(in.CacheReadPrice),
		Enabled:         true,
	}
	if in.Enabled != nil {
		m.Enabled = *in.Enabled
	}
	if in.Sort != nil {
		m.Sort = *in.Sort
	}
	if err := h.db.Create(m).Error; err != nil {
		h.log.Warn("create model failed", zap.Error(err))
		httpx.Fail(c, http.StatusInternalServerError, "create model failed")
		return
	}
	httpx.Created(c, modelDTO(m))
}

// Update handles PUT /api/v1/admin/models/:id.
func (h *modelHandler) Update(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		httpx.Fail(c, http.StatusBadRequest, "invalid model id")
		return
	}
	var m store.Model
	if err := h.db.First(&m, id).Error; err != nil {
		httpx.Fail(c, http.StatusNotFound, "model not found")
		return
	}
	var in modelInput
	if !httpx.Bind(c, &in) {
		return
	}
	updates := map[string]any{
		"name": in.Name,
	}
	if in.DisplayName != "" {
		updates["display_name"] = in.DisplayName
	}
	if in.InputPrice != "" {
		updates["input_price"] = parsePrice(in.InputPrice)
	}
	if in.OutputPrice != "" {
		updates["output_price"] = parsePrice(in.OutputPrice)
	}
	if in.CacheReadPrice != "" {
		updates["cache_read_price"] = parsePrice(in.CacheReadPrice)
	}
	if in.Enabled != nil {
		updates["enabled"] = *in.Enabled
	}
	if in.Sort != nil {
		updates["sort"] = *in.Sort
	}
	if err := h.db.Model(&m).Updates(updates).Error; err != nil {
		h.log.Warn("update model failed", zap.Error(err))
		httpx.Fail(c, http.StatusInternalServerError, "update model failed")
		return
	}
	h.db.First(&m, id)
	httpx.OK(c, modelDTO(&m))
}

// UpdatePrice handles PUT /api/v1/admin/models/:id/price.
func (h *modelHandler) UpdatePrice(c *gin.Context) {
	id, err := strconv.ParseInt(c.Param("id"), 10, 64)
	if err != nil {
		httpx.Fail(c, http.StatusBadRequest, "invalid model id")
		return
	}
	var in struct {
		InputPrice     string `json:"inputPrice"`
		OutputPrice    string `json:"outputPrice"`
		CacheReadPrice string `json:"cacheReadPrice"`
	}
	if !httpx.Bind(c, &in) {
		return
	}
	updates := map[string]any{}
	if in.InputPrice != "" {
		updates["input_price"] = parsePrice(in.InputPrice)
	}
	if in.OutputPrice != "" {
		updates["output_price"] = parsePrice(in.OutputPrice)
	}
	if in.CacheReadPrice != "" {
		updates["cache_read_price"] = parsePrice(in.CacheReadPrice)
	}
	if len(updates) == 0 {
		httpx.Fail(c, http.StatusBadRequest, "no price fields provided")
		return
	}
	res := h.db.Model(&store.Model{}).Where("id = ?", id).Updates(updates)
	if res.RowsAffected == 0 {
		httpx.Fail(c, http.StatusNotFound, "model not found")
		return
	}
	httpx.OK(c, gin.H{"ok": true})
}

func parsePrice(s string) decimal.Decimal {
	d, err := decimal.NewFromString(s)
	if err != nil {
		return decimal.Zero
	}
	return d.Round(8)
}

func modelDTO(m *store.Model) gin.H {
	return gin.H{
		"id": m.ID, "name": m.Name, "displayName": m.DisplayName,
		"inputPrice": m.InputPrice.String(), "outputPrice": m.OutputPrice.String(),
		"cacheReadPrice": m.CacheReadPrice.String(), "enabled": m.Enabled, "sort": m.Sort,
	}
}