package admin

import (
	"fmt"
	"net/http"
	"os"
	"path/filepath"
	"strings"

	"thehouseoficarus/internal/behavior"
)

func (s *AdminServer) handleDrops(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case http.MethodGet:
		ids, err := listYAMLFiles(s.dataDir, "drops")
		if err != nil {
			writeJSON(w, map[string]any{"error": err.Error()})
			return
		}
		if ids == nil {
			ids = []string{}
		}
		writeJSON(w, ids)

	case http.MethodPost:
		s.createDrop(w, r)

	default:
		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
	}
}

func (s *AdminServer) handleDropByID(w http.ResponseWriter, r *http.Request) {
	id := strings.TrimPrefix(r.URL.Path, "/api/drops/")
	if id == "" {
		http.Error(w, `{"error":"missing drop id"}`, http.StatusBadRequest)
		return
	}

	switch r.Method {
	case http.MethodGet:
		s.getDrop(w, r, id)
	case http.MethodPut:
		s.updateDrop(w, r, id)
	case http.MethodDelete:
		s.deleteDrop(w, r, id)
	default:
		http.Error(w, `{"error":"method not allowed"}`, http.StatusMethodNotAllowed)
	}
}

func (s *AdminServer) getDrop(w http.ResponseWriter, r *http.Request, id string) {
	data, path, err := readYAMLFile(s.dataDir, "drops", id)
	if err != nil {
		http.Error(w, `{"error":"drop not found"}`, http.StatusNotFound)
		return
	}
	m, err := yamlToMap(data)
	if err != nil {
		http.Error(w, `{"error":"failed to parse drop yaml"}`, http.StatusInternalServerError)
		return
	}
	m["_path"] = path
	m["_raw"] = string(data)
	writeJSON(w, m)
}

func (s *AdminServer) updateDrop(w http.ResponseWriter, r *http.Request, id string) {
	_, path, err := readYAMLFile(s.dataDir, "drops", id)
	if err != nil {
		http.Error(w, `{"error":"drop not found"}`, http.StatusNotFound)
		return
	}

	var m map[string]any
	if err := readJSON(r, &m); err != nil {
		http.Error(w, `{"error":"invalid json body"}`, http.StatusBadRequest)
		return
	}
	m["id"] = id

	oldContent, err := snapshotFile(path)
	if err != nil {
		http.Error(w, `{"error":"failed to read existing drop"}`, http.StatusInternalServerError)
		return
	}

	newContent, err := writeMapAsYAML(path, m)
	if err != nil {
		http.Error(w, `{"error":"failed to write drop"}`, http.StatusInternalServerError)
		return
	}

	behavior.ClearDropIndex()

	s.undoStack.Push(ChangeDesc{
		Description: fmt.Sprintf("Update drop %s", id),
		FilePath:    path,
		OldContent:  oldContent,
		NewContent:  newContent,
	})

	writeJSON(w, m)
}

func (s *AdminServer) deleteDrop(w http.ResponseWriter, r *http.Request, id string) {
	_, path, err := readYAMLFile(s.dataDir, "drops", id)
	if err != nil {
		http.Error(w, `{"error":"drop not found"}`, http.StatusNotFound)
		return
	}

	oldContent := backupFile(path)

	if err := os.Remove(path); err != nil {
		http.Error(w, `{"error":"failed to delete drop"}`, http.StatusInternalServerError)
		return
	}

	behavior.ClearDropIndex()

	s.undoStack.Push(ChangeDesc{
		Description: fmt.Sprintf("Delete drop %s", id),
		FilePath:    path,
		OldContent:  oldContent,
		IsDelete:    true,
	})

	writeJSON(w, map[string]any{"deleted": id})
}

func (s *AdminServer) createDrop(w http.ResponseWriter, r *http.Request) {
	var m map[string]any
	if err := readJSON(r, &m); err != nil {
		http.Error(w, `{"error":"invalid json body"}`, http.StatusBadRequest)
		return
	}

	id, ok := m["id"].(string)
	if !ok || strings.TrimSpace(id) == "" {
		http.Error(w, `{"error":"missing drop id"}`, http.StatusBadRequest)
		return
	}

	path := filepath.Join(s.dataDir, "drops", id+".yaml")
	if _, err := os.Stat(path); err == nil {
		http.Error(w, `{"error":"drop already exists"}`, http.StatusConflict)
		return
	}

	newContent, err := writeMapAsYAML(path, m)
	if err != nil {
		http.Error(w, `{"error":"failed to write drop"}`, http.StatusInternalServerError)
		return
	}

	behavior.ClearDropIndex()

	s.undoStack.Push(ChangeDesc{
		Description: fmt.Sprintf("Create drop %s", id),
		FilePath:    path,
		NewContent:  newContent,
		IsCreate:    true,
	})

	writeJSON(w, m)
}