package gateway

import (
	"encoding/json"
	"io"
	"net/http"
	"strings"

	"llmsproxy/internal/config"
)

type adapterPayload struct {
	Name string `json:"name"`
	Code string `json:"code"`
}

func (g *Gateway) handleAdaptersAPI(w http.ResponseWriter, r *http.Request) {
	path := strings.TrimPrefix(r.URL.Path, "/api/adapters")
	path = strings.Trim(path, "/")

	switch r.Method {
	case http.MethodGet:
		if path == "" {
			writeJSON(w, http.StatusOK, map[string]interface{}{"adapters": g.core.ListAdapters()})
			return
		}
		writeError(w, http.StatusNotFound, "not_found", "adapter code not exposed; edit in UI")
	case http.MethodPost:
		var p adapterPayload
		if err := json.NewDecoder(r.Body).Decode(&p); err != nil {
			writeError(w, http.StatusBadRequest, "invalid_request", "invalid json: "+err.Error())
			return
		}
		if err := g.core.UploadAdapter(p.Name, p.Code); err != nil {
			writeError(w, http.StatusBadRequest, "adapter_error", err.Error())
			return
		}
		writeJSON(w, http.StatusOK, map[string]interface{}{"ok": true, "name": p.Name})
	case http.MethodDelete:
		if path == "" {
			writeError(w, http.StatusBadRequest, "invalid_request", "adapter name required")
			return
		}
		if err := g.core.RemoveAdapter(path); err != nil {
			writeError(w, http.StatusBadRequest, "adapter_error", err.Error())
			return
		}
		writeJSON(w, http.StatusOK, map[string]interface{}{"ok": true})
	default:
		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "")
	}
}

// sourcePayload mirrors config.Source for JSON web UI editing.
type sourcePayload struct {
	Name          string                 `json:"name"`
	BaseURL       string                 `json:"base_url"`
	APIKey        string                 `json:"api_key"`
	Adapter       string                 `json:"adapter"`
	Endpoint      string                 `json:"endpoint"`
	ImageEndpoint string                 `json:"image_endpoint"`
	Models        []config.Model         `json:"models"`
	Headers       map[string]string      `json:"headers"`
	Meta          map[string]interface{} `json:"meta"`
	Temperature   float64                `json:"temperature"`
	MaxTokens     int                    `json:"max_tokens"`
	MaxConcurrent int                    `json:"max_concurrent"`
}

func (g *Gateway) handleSourcesAPI(w http.ResponseWriter, r *http.Request) {
	path := strings.TrimPrefix(r.URL.Path, "/api/sources")
	path = strings.Trim(path, "/")

	switch r.Method {
	case http.MethodGet:
		writeJSON(w, http.StatusOK, map[string]interface{}{"sources": g.core.Sources()})
	case http.MethodPost:
		var p sourcePayload
		body, _ := io.ReadAll(r.Body)
		if err := json.Unmarshal(body, &p); err != nil {
			writeError(w, http.StatusBadRequest, "invalid_request", "invalid json: "+err.Error())
			return
		}
		src := config.Source{
			Name:          p.Name,
			BaseURL:       p.BaseURL,
			APIKey:        p.APIKey,
			Adapter:       p.Adapter,
			Endpoint:      p.Endpoint,
			ImageEndpoint: p.ImageEndpoint,
			Models:        p.Models,
			Headers:       p.Headers,
			Meta:          p.Meta,
			Temperature:   p.Temperature,
			MaxTokens:     p.MaxTokens,
			MaxConcurrent: p.MaxConcurrent,
		}
		if err := g.core.AddSource(src); err != nil {
			writeError(w, http.StatusBadRequest, "source_error", err.Error())
			return
		}
		writeJSON(w, http.StatusOK, map[string]interface{}{"ok": true})
	case http.MethodDelete:
		if path == "" {
			writeError(w, http.StatusBadRequest, "invalid_request", "source name required")
			return
		}
		if err := g.core.RemoveSource(path); err != nil {
			writeError(w, http.StatusBadRequest, "source_error", err.Error())
			return
		}
		writeJSON(w, http.StatusOK, map[string]interface{}{"ok": true})
	default:
		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "")
	}
}