package server

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

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

	"git.wntrmute.dev/mc/mcr/internal/auth"
	"git.wntrmute.dev/mc/mcr/internal/db"
)

// AdminListReposHandler handles GET /v1/repositories.
func AdminListReposHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		limit := 50
		offset := 0
		if n := r.URL.Query().Get("n"); n != "" {
			if v, err := strconv.Atoi(n); err == nil && v > 0 {
				limit = v
			}
		}
		if o := r.URL.Query().Get("offset"); o != "" {
			if v, err := strconv.Atoi(o); err == nil && v >= 0 {
				offset = v
			}
		}

		repos, err := database.ListRepositoriesWithMetadata(limit, offset)
		if err != nil {
			writeAdminError(w, http.StatusInternalServerError, "internal error")
			return
		}
		if repos == nil {
			repos = []db.RepoMetadata{}
		}
		writeJSON(w, http.StatusOK, repos)
	}
}

// AdminGetRepoHandler handles GET /v1/repositories/*.
func AdminGetRepoHandler(database *db.DB) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		name := chi.URLParam(r, "*")
		if name == "" {
			writeAdminError(w, http.StatusBadRequest, "repository name required")
			return
		}

		detail, err := database.GetRepositoryDetail(name)
		if err != nil {
			if errors.Is(err, db.ErrRepoNotFound) {
				writeAdminError(w, http.StatusNotFound, "repository not found")
				return
			}
			writeAdminError(w, http.StatusInternalServerError, "internal error")
			return
		}
		writeJSON(w, http.StatusOK, detail)
	}
}

// AdminDeleteRepoHandler handles DELETE /v1/repositories/*.
// Requires admin role (enforced by RequireAdmin middleware).
func AdminDeleteRepoHandler(database *db.DB, auditFn AuditFunc) http.HandlerFunc {
	return func(w http.ResponseWriter, r *http.Request) {
		name := chi.URLParam(r, "*")
		if name == "" {
			writeAdminError(w, http.StatusBadRequest, "repository name required")
			return
		}

		if err := database.DeleteRepository(name); err != nil {
			if errors.Is(err, db.ErrRepoNotFound) {
				writeAdminError(w, http.StatusNotFound, "repository not found")
				return
			}
			writeAdminError(w, http.StatusInternalServerError, "internal error")
			return
		}

		if auditFn != nil {
			claims := auth.ClaimsFromContext(r.Context())
			actorID := ""
			if claims != nil {
				actorID = claims.Subject
			}
			auditFn("repo_deleted", actorID, name, "", r.RemoteAddr, nil)
		}

		w.WriteHeader(http.StatusNoContent)
	}
}