package handlers

import (
	"auto-ssl/config"
	"encoding/json"
	"net/http"
	"strconv"

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

type CredentialHandler struct{}

func NewCredentialHandler() *CredentialHandler {
	return &CredentialHandler{}
}

type CreateCredentialRequest struct {
	Name string              `json:"name" binding:"required"`
	Type config.CredentialType `json:"type" binding:"required"`
	Data string              `json:"data" binding:"required"` // JSON key-value pairs
}

type UpdateCredentialRequest struct {
	Name string              `json:"name"`
	Type config.CredentialType `json:"type"`
	Data string              `json:"data"` // JSON key-value pairs (or "********" to keep)
}

// ListCredentials returns all credentials (without secrets)
func (h *CredentialHandler) ListCredentials(c *gin.Context) {
	creds := config.CredStore.GetAll()
	c.JSON(http.StatusOK, creds)
}

// GetCredential returns a single credential
func (h *CredentialHandler) GetCredential(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}

	cred := config.CredStore.GetByID(uint(id))
	if cred == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "credential not found"})
		return
	}

	// Never expose raw secrets in API
	cred.Data = cred.Masked
	c.JSON(http.StatusOK, cred)
}

// CreateCredential creates a new credential
func (h *CredentialHandler) CreateCredential(c *gin.Context) {
	var req CreateCredentialRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Validate JSON data
	var testData map[string]string
	if err := json.Unmarshal([]byte(req.Data), &testData); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "data must be valid JSON key-value pairs"})
		return
	}

	// Validate fields for the provider type
	fields := config.CredentialTypeMeta(req.Type)
	for _, f := range fields {
		if f.Required {
			if _, ok := testData[f.Key]; !ok || testData[f.Key] == "" {
				c.JSON(http.StatusBadRequest, gin.H{"error": f.Label + " 是必填项"})
				return
			}
		}
	}

	cred := &config.Credential{
		Name: req.Name,
		Type: req.Type,
		Data: req.Data,
	}

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

	// Return without secrets
	cred.Data = cred.Masked
	c.JSON(http.StatusCreated, cred)
}

// UpdateCredential updates a credential
func (h *CredentialHandler) UpdateCredential(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}

	existing := config.CredStore.GetByID(uint(id))
	if existing == nil {
		c.JSON(http.StatusNotFound, gin.H{"error": "credential not found"})
		return
	}

	var req UpdateCredentialRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	if req.Name != "" {
		existing.Name = req.Name
	}
	if req.Type != "" {
		existing.Type = req.Type
	}
	if req.Data != "" {
		// If it's the masked placeholder, keep existing data
		if req.Data == "********" {
			existing.Data = existing.Data
		} else {
			var testData map[string]string
			if err := json.Unmarshal([]byte(req.Data), &testData); err != nil {
				c.JSON(http.StatusBadRequest, gin.H{"error": "data must be valid JSON"})
				return
			}
			existing.Data = req.Data
		}
	}

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

	existing.Data = existing.Masked
	c.JSON(http.StatusOK, existing)
}

// DeleteCredential deletes a credential
func (h *CredentialHandler) DeleteCredential(c *gin.Context) {
	id, err := strconv.ParseUint(c.Param("id"), 10, 64)
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid id"})
		return
	}

	if err := config.CredStore.Delete(uint(id)); err != nil {
		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusOK, gin.H{"message": "credential deleted"})
}

// GetCredentialTypes returns available credential types and their fields
func (h *CredentialHandler) GetCredentialTypes(c *gin.Context) {
	types := []gin.H{
		{
			"type":   config.CredentialAliDNS,
			"label":  "阿里云 DNS (Aliyun)",
			"fields": config.CredentialTypeMeta(config.CredentialAliDNS),
		},
		{
			"type":   config.CredentialCloudflare,
			"label":  "Cloudflare",
			"fields": config.CredentialTypeMeta(config.CredentialCloudflare),
		},
		{
			"type":   config.CredentialDNSPod,
			"label":  "DNSPod",
			"fields": config.CredentialTypeMeta(config.CredentialDNSPod),
		},
	}
	c.JSON(http.StatusOK, types)
}