package handlers

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"

	"github.com/llamalink/llamalink/internal/api/middleware"
	"github.com/llamalink/llamalink/internal/auth"
)

type KeysHandler struct {
	authService *auth.Service
}

func NewKeysHandler(authService *auth.Service) *KeysHandler {
	return &KeysHandler{authService: authService}
}

type CreateKeyRequest struct {
	Name        string   `json:"name" binding:"required"`
	Scopes      []string `json:"scopes"`
	TokensLimit *int     `json:"tokens_limit"`
	WebhookURL  *string  `json:"webhook_url"`
	OwnerLabel  *string  `json:"owner_label"`
}

func (h *KeysHandler) ListKeys(c *gin.Context) {
	includeInactive := c.Query("include_inactive") == "true"

	keys, err := h.authService.List(includeInactive)
	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	// Don't expose key hash
	safeKeys := make([]gin.H, len(keys))
	for i, k := range keys {
		safeKeys[i] = gin.H{
			"id":           k.ID,
			"name":         k.Name,
			"key_prefix":   k.KeyPrefix,
			"scopes":       k.Scopes,
			"is_active":    k.IsActive,
			"is_admin":     k.IsAdmin,
			"owner_label":  k.OwnerLabel,
			"created_at":   k.CreatedAt,
			"last_used_at": k.LastUsedAt,
		}
	}

	c.JSON(http.StatusOK, safeKeys)
}

func (h *KeysHandler) CreateKey(c *gin.Context) {
	var req CreateKeyRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.Scopes == nil {
		req.Scopes = []string{"chat", "models", "usage"}
	}

	apiKey, rawKey, err := h.authService.Create(auth.CreateKeyRequest{
		Name:        req.Name,
		Scopes:      req.Scopes,
		TokensLimit: req.TokensLimit,
		WebhookURL:  req.WebhookURL,
		OwnerLabel:  req.OwnerLabel,
	})

	if err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":         apiKey.ID,
		"name":       apiKey.Name,
		"key":        rawKey,
		"key_prefix": apiKey.KeyPrefix,
		"scopes":     apiKey.Scopes,
		"is_admin":   apiKey.IsAdmin,
		"created_at": apiKey.CreatedAt,
	})
}

func (h *KeysHandler) RevokeKey(c *gin.Context) {
	idStr := c.Param("id")
	id, err := uuid.Parse(idStr)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid key id"})
		return
	}

	// Can't revoke own key
	currentKey := middleware.GetAPIKey(c)
	if currentKey.ID == id {
		c.JSON(http.StatusBadRequest, gin.H{
			"error": gin.H{
				"code":    "validation_error",
				"message": "Cannot revoke your own admin key",
			},
		})
		return
	}

	if err := h.authService.Revoke(id); err != nil {
		if err == auth.ErrKeyNotFound {
			c.JSON(http.StatusNotFound, gin.H{"error": "key not found"})
			return
		}
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.Status(http.StatusNoContent)
}