package handler

import (
	"net/http"
	"strconv"

	"spider/internal/model"

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

// SeedHandler handles managed seed CRUD.
type SeedHandler struct {
	db *gorm.DB
}

// List returns seeds with optional status filter and pagination.
// GET /seeds?page=1&page_size=20&status=active
func (h *SeedHandler) List(c *gin.Context) {
	page, pageSize, offset := parsePage(c)

	query := h.db.Model(&model.ManagedSeed{})
	if status := c.Query("status"); status != "" {
		query = query.Where("status = ?", status)
	}

	var total int64
	if err := query.Count(&total).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	var seeds []model.ManagedSeed
	if err := query.Order("id DESC").Limit(pageSize).Offset(offset).Find(&seeds).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	PageOK(c, seeds, total, page, pageSize)
}

// Create creates a new seed.
// POST /seeds  body: {channel_name, note}
func (h *SeedHandler) Create(c *gin.Context) {
	var body struct {
		ChannelName string `json:"channel_name" binding:"required"`
		Note        string `json:"note"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, http.StatusBadRequest, err.Error())
		return
	}

	seed := model.ManagedSeed{
		ChannelName: body.ChannelName,
		Note:        body.Note,
		Status:      "active",
	}
	if err := h.db.Create(&seed).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, seed)
}

// Update modifies a seed's status and/or note.
// PUT /seeds/:id  body: {status, note}
func (h *SeedHandler) Update(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, http.StatusBadRequest, "invalid id")
		return
	}

	var body struct {
		Status string `json:"status"`
		Note   string `json:"note"`
	}
	if err := c.ShouldBindJSON(&body); err != nil {
		Fail(c, http.StatusBadRequest, err.Error())
		return
	}

	var seed model.ManagedSeed
	if err := h.db.First(&seed, id).Error; err != nil {
		Fail(c, 404, "seed not found")
		return
	}

	updates := map[string]interface{}{}
	if body.Status != "" {
		updates["status"] = body.Status
	}
	updates["note"] = body.Note

	if err := h.db.Model(&seed).Updates(updates).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}

	h.db.First(&seed, id)
	OK(c, seed)
}

// Delete removes a seed by ID.
// DELETE /seeds/:id
func (h *SeedHandler) Delete(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		Fail(c, http.StatusBadRequest, "invalid id")
		return
	}

	if err := h.db.Delete(&model.ManagedSeed{}, id).Error; err != nil {
		Fail(c, 500, err.Error())
		return
	}
	OK(c, nil)
}