package api

import (
	"net/http"
	"strconv"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/openteam/server/internal/pkg/apikey"
	"github.com/openteam/server/internal/pkg/resp"
	"github.com/openteam/server/internal/store"
)

type createKeyReq struct {
	Name              string    `json:"name" binding:"required,min=1,max=64"`
	QuotaTokensPerDay *int64    `json:"quota_tokens_per_day"`
	QuotaRequestsPerDay *int    `json:"quota_requests_per_day"`
	AllowedModels     []string  `json:"allowed_models"`
	ExpiresAt         *string   `json:"expires_at"` // RFC3339
}

// CreateKey POST /api/v1/keys — 创建密钥，明文仅此一次返回。
func (h *Handler) CreateKey(c *gin.Context) {
	u, ok := userFromContext(c)
	if !ok {
		resp.Fail(c, http.StatusUnauthorized, "authentication required")
		return
	}
	var req createKeyReq
	if err := c.ShouldBindJSON(&req); err != nil {
		resp.Fail(c, http.StatusBadRequest, "invalid input: "+err.Error())
		return
	}
	plain, hash, prefix, err := apikey.Generate()
	if err != nil {
		resp.Fail(c, http.StatusInternalServerError, "failed to generate key")
		return
	}
	k := store.APIKey{
		UserID:            u.ID,
		Name:              req.Name,
		KeyHash:           hash,
		KeyPrefix:         prefix,
		QuotaTokensPerDay: req.QuotaTokensPerDay,
		QuotaRequestsPerDay: req.QuotaRequestsPerDay,
		AllowedModels:     req.AllowedModels,
		Status:            store.KeyStatusActive,
	}
	if req.ExpiresAt != nil {
		t, err := time.Parse(time.RFC3339, *req.ExpiresAt)
		if err != nil {
			resp.Fail(c, http.StatusBadRequest, "expires_at must be RFC3339")
			return
		}
		k.ExpiresAt = &t
	}
	if err := h.a.DB.Create(&k).Error; err != nil {
		resp.Fail(c, http.StatusInternalServerError, "failed to create key")
		return
	}
	resp.Created(c, gin.H{
		"id":         k.ID,
		"name":       k.Name,
		"key":        plain, // 仅此一次
		"key_prefix": k.KeyPrefix,
		"created_at": k.CreatedAt,
	})
}

// ListKeys GET /api/v1/keys
func (h *Handler) ListKeys(c *gin.Context) {
	u, ok := userFromContext(c)
	if !ok {
		resp.Fail(c, http.StatusUnauthorized, "authentication required")
		return
	}
	var keys []store.APIKey
	if err := h.a.DB.Where("user_id = ?", u.ID).Order("id DESC").Find(&keys).Error; err != nil {
		resp.Fail(c, http.StatusInternalServerError, "failed to load keys")
		return
	}
	out := make([]gin.H, 0, len(keys))
	for _, k := range keys {
		out = append(out, gin.H{
			"id":                    k.ID,
			"name":                  k.Name,
			"key_prefix":            k.KeyPrefix,
			"quota_tokens_per_day":  k.QuotaTokensPerDay,
			"quota_requests_per_day": k.QuotaRequestsPerDay,
			"allowed_models":        k.AllowedModels,
			"expires_at":            k.ExpiresAt,
			"status":                k.Status,
			"last_used_at":          k.LastUsedAt,
			"created_at":            k.CreatedAt,
		})
	}
	resp.OK(c, gin.H{"items": out})
}

// PatchKey PATCH /api/v1/keys/:id — 改名、限额、白名单、启停。
func (h *Handler) PatchKey(c *gin.Context) {
	u, ok := userFromContext(c)
	if !ok {
		resp.Fail(c, http.StatusUnauthorized, "authentication required")
		return
	}
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		resp.Fail(c, http.StatusBadRequest, "invalid key id")
		return
	}
	var req struct {
		Name              *string   `json:"name"`
		QuotaTokensPerDay *int64    `json:"quota_tokens_per_day"`
		QuotaRequestsPerDay *int    `json:"quota_requests_per_day"`
		AllowedModels     *[]string `json:"allowed_models"`
		Status            *string   `json:"status"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		resp.Fail(c, http.StatusBadRequest, "invalid input")
		return
	}
	var k store.APIKey
	if err := h.a.DB.Where("id = ? AND user_id = ?", id, u.ID).First(&k).Error; err != nil {
		resp.Fail(c, http.StatusNotFound, "key not found")
		return
	}
	updates := map[string]any{}
	if req.Name != nil {
		updates["name"] = *req.Name
	}
	if req.QuotaTokensPerDay != nil {
		updates["quota_tokens_per_day"] = *req.QuotaTokensPerDay
	}
	if req.QuotaRequestsPerDay != nil {
		updates["quota_requests_per_day"] = *req.QuotaRequestsPerDay
	}
	if req.AllowedModels != nil {
		updates["allowed_models"] = *req.AllowedModels
	}
	if req.Status != nil {
		if *req.Status != store.KeyStatusActive && *req.Status != store.KeyStatusRevoked {
			resp.Fail(c, http.StatusBadRequest, "status must be active or revoked")
			return
		}
		updates["status"] = *req.Status
	}
	if len(updates) > 0 {
		if err := h.a.DB.Model(&k).Updates(updates).Error; err != nil {
			resp.Fail(c, http.StatusInternalServerError, "failed to update key")
			return
		}
	}
	resp.OK(c, gin.H{"ok": true})
}

// DeleteKey DELETE /api/v1/keys/:id — 吊销。
func (h *Handler) DeleteKey(c *gin.Context) {
	u, ok := userFromContext(c)
	if !ok {
		resp.Fail(c, http.StatusUnauthorized, "authentication required")
		return
	}
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		resp.Fail(c, http.StatusBadRequest, "invalid key id")
		return
	}
	res := h.a.DB.Model(&store.APIKey{}).
		Where("id = ? AND user_id = ?", id, u.ID).
		Update("status", store.KeyStatusRevoked)
	if res.Error != nil {
		resp.Fail(c, http.StatusInternalServerError, "failed to revoke key")
		return
	}
	if res.RowsAffected == 0 {
		resp.Fail(c, http.StatusNotFound, "key not found")
		return
	}
	resp.OK(c, gin.H{"ok": true})
}