package server

import (
	"encoding/json"
	"errors"
	"net/http"
	"strconv"

	"github.com/go-chi/chi/v5"

	"git.wntrmute.dev/kyle/mcns/internal/db"
)

type createRecordRequest struct {
	Name  string `json:"name"`
	Type  string `json:"type"`
	Value string `json:"value"`
	TTL   int    `json:"ttl"`
}

func listRecordsHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		zoneName := chi.URLParam(r, "zone")
		nameFilter := r.URL.Query().Get("name")
		typeFilter := r.URL.Query().Get("type")

		records, err := database.ListRecords(zoneName, nameFilter, typeFilter)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "zone not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to list records")
			return
		}
		if records == nil {
			records = []db.Record{}
		}
		writeJSON(w, http.StatusOK, map[string]any{"records": records})
	}
}

func getRecordHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid record ID")
			return
		}

		record, err := database.GetRecord(id)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "record not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to get record")
			return
		}

		writeJSON(w, http.StatusOK, record)
	}
}

func createRecordHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		zoneName := chi.URLParam(r, "zone")

		var req createRecordRequest
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			writeError(w, http.StatusBadRequest, "invalid request body")
			return
		}

		if req.Name == "" {
			writeError(w, http.StatusBadRequest, "name is required")
			return
		}
		if req.Type == "" {
			writeError(w, http.StatusBadRequest, "type is required")
			return
		}
		if req.Value == "" {
			writeError(w, http.StatusBadRequest, "value is required")
			return
		}

		record, err := database.CreateRecord(zoneName, req.Name, req.Type, req.Value, req.TTL)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "zone not found")
			return
		}
		if errors.Is(err, db.ErrConflict) {
			writeError(w, http.StatusConflict, err.Error())
			return
		}
		if err != nil {
			writeError(w, http.StatusBadRequest, err.Error())
			return
		}

		writeJSON(w, http.StatusCreated, record)
	}
}

func updateRecordHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid record ID")
			return
		}

		var req createRecordRequest
		if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
			writeError(w, http.StatusBadRequest, "invalid request body")
			return
		}

		if req.Name == "" {
			writeError(w, http.StatusBadRequest, "name is required")
			return
		}
		if req.Type == "" {
			writeError(w, http.StatusBadRequest, "type is required")
			return
		}
		if req.Value == "" {
			writeError(w, http.StatusBadRequest, "value is required")
			return
		}

		record, err := database.UpdateRecord(id, req.Name, req.Type, req.Value, req.TTL)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "record not found")
			return
		}
		if errors.Is(err, db.ErrConflict) {
			writeError(w, http.StatusConflict, err.Error())
			return
		}
		if err != nil {
			writeError(w, http.StatusBadRequest, err.Error())
			return
		}

		writeJSON(w, http.StatusOK, record)
	}
}

func deleteRecordHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		idStr := chi.URLParam(r, "id")
		id, err := strconv.ParseInt(idStr, 10, 64)
		if err != nil {
			writeError(w, http.StatusBadRequest, "invalid record ID")
			return
		}

		err = database.DeleteRecord(id)
		if errors.Is(err, db.ErrNotFound) {
			writeError(w, http.StatusNotFound, "record not found")
			return
		}
		if err != nil {
			writeError(w, http.StatusInternalServerError, "failed to delete record")
			return
		}

		w.WriteHeader(http.StatusNoContent)
	}
}