(ns ruuter.core-test
  #?(:clj (:require [clojure.test :refer :all]
                    [ruuter.core :as ruuter]))
  #?(:cljs (:require [cljs.test :refer-macros [deftest testing is]]
                     [ruuter.core :as ruuter])))

;; ── Required Param Tests ────────────────────────────────────────────────

(deftest no-params-test
  (testing "No params returns an empty params map"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/world" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world" :request-method :get})
      (is (= {} @params)))))

(deftest single-param-test
  (testing "Single required param"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world" :request-method :get})
      (is (= {:who "world"} @params))))

  (testing "Multiple required params"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who/:why" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world/because" :request-method :get})
      (is (= {:who "world" :why "because"} @params)))))

;; ── Optional Param Tests ───────────────────────────────────────────────

(deftest optional-param-test
  (testing "Required and optional param — both present"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who/:why?" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world/because" :request-method :get})
      (is (= {:who "world" :why "because"} @params))))

  (testing "Required and optional param — optional absent"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who/:why?" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world" :request-method :get})
      (is (= {:who "world"} @params))))

  (testing "Multiple optional params — all present"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who?/:why?" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world/because" :request-method :get})
      (is (= {:who "world" :why "because"} @params))))

  (testing "Multiple optional params — only first present"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who?/:why?" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/world" :request-method :get})
      (is (= {:who "world"} @params)))))

;; ── Wildcard Param Tests ───────────────────────────────────────────────

(deftest wildcard-param-test
  (testing "Wildcard param"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:everything*" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/hello/this/means/literally/everything" :request-method :get})
      (is (= {:everything "this/means/literally/everything"} @params))))

  (testing "Normal params and wildcard param"
    (let [params (atom nil)]
      (ruuter/route [{:path "/user/:id/file/:path*" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/user/123/file/foo.txt" :request-method :get})
      (is (= {:id "123" :path "foo.txt"} @params))))

  (testing "Normal params and wildcard with deep path"
    (let [params (atom nil)]
      (ruuter/route [{:path "/user/:id/file/:path*" :method :get
                      :response (fn [req] (reset! params (:params req)) {:status 200 :body ""})}]
                    {:uri "/user/123/file/a/b/c/foo.txt" :request-method :get})
      (is (= {:id "123" :path "a/b/c/foo.txt"} @params)))))

;; ── Route Matching Tests ───────────────────────────────────────────────

(deftest match-route-test
  (testing "Finds a matching route"
    (is (= {:status 200 :body "Hello."}
           (ruuter/route [{:path "/hello" :method :get
                           :response {:status 200 :body "Hello."}}]
                         {:uri "/hello" :request-method :get}))))

  (testing "No route found returns 404"
    (is (= {:status 404 :body "Not found."}
           (ruuter/route [] {:uri "/hello" :request-method :get}))))

  (testing "Method mismatch returns 404"
    (is (= {:status 404 :body "Not found."}
           (ruuter/route [{:path "/hello" :method :post
                           :response {:status 200 :body "Hello."}}]
                         {:uri "/hello" :request-method :get}))))

  (testing "Root path matches"
    (is (= {:status 200 :body "root"}
           (ruuter/route [{:path "/" :method :get
                           :response {:status 200 :body "root"}}]
                         {:uri "/" :request-method :get})))))

;; ── Response Tests ─────────────────────────────────────────────────────

(deftest response-test
  (testing "Returns a map when the response is a direct map"
    (is (= {:status 200 :body "Hello."}
           (ruuter/route [{:path "/hello" :method :get
                           :response {:status 200 :body "Hello."}}]
                         {:uri "/hello" :request-method :get}))))

  (testing "Returns a map via fn when the response is a fn"
    (is (= {:status 200 :body "Hello, world."}
           (ruuter/route [{:path "/hello/:who" :method :get
                           :response (fn [req]
                                       {:status 200
                                        :body (str "Hello, " (:who (:params req)) ".")})}]
                         {:uri "/hello/world" :request-method :get}))))

  (testing "Returns 404 when route is not found"
    (is (= {:status 404 :body "Not found."}
           (ruuter/route [] {:uri "/hello" :request-method :get}))))

  (testing "Returns combined :params map"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who" :method :get
                      :response (fn [req]
                                  (reset! params (:params req))
                                  {:status 200 :body ""})}]
                    {:uri "/hello/world"
                     :request-method :get
                     :params {:some-params :from-elsewhere}})
      (is (= {:who "world" :some-params :from-elsewhere} @params))))

  (testing "External params overwrite route params"
    (let [params (atom nil)]
      (ruuter/route [{:path "/hello/:who" :method :get
                      :response (fn [req]
                                  (reset! params (:params req))
                                  {:status 200 :body ""})}]
                    {:uri "/hello/world"
                     :request-method :get
                     :params {:who "overwritten"}})
      (is (= {:who "overwritten"} @params)))))

;; ── Best-Match / Specificity Tests ─────────────────────────────────────

(deftest literal-beats-param-test
  (testing "Literal beats param regardless of route order"
    (is (= {:status 200 :body "literal"}
           (ruuter/route [{:path "/hello/:who" :method :get
                           :response {:status 200 :body "param"}}
                          {:path "/hello/world" :method :get
                           :response {:status 200 :body "literal"}}]
                         {:uri "/hello/world" :request-method :get}))))

  (testing "Literal beats param — reversed order"
    (is (= {:status 200 :body "literal"}
           (ruuter/route [{:path "/hello/world" :method :get
                           :response {:status 200 :body "literal"}}
                          {:path "/hello/:who" :method :get
                           :response {:status 200 :body "param"}}]
                         {:uri "/hello/world" :request-method :get})))))

(deftest param-specificity-test
  (testing "Required param beats optional param"
    (is (= {:status 200 :body "required"}
           (ruuter/route [{:path "/hello/:who?" :method :get
                           :response {:status 200 :body "optional"}}
                          {:path "/hello/:who" :method :get
                           :response {:status 200 :body "required"}}]
                         {:uri "/hello/world" :request-method :get}))))

  (testing "Required param beats wildcard"
    (is (= {:status 200 :body "param"}
           (ruuter/route [{:path "/hello/:catch*" :method :get
                           :response {:status 200 :body "wildcard"}}
                          {:path "/hello/:who" :method :get
                           :response {:status 200 :body "param"}}]
                         {:uri "/hello/world" :request-method :get}))))

  (testing "Param match still works when no literal matches"
    (is (= {:status 200 :body "param"}
           (ruuter/route [{:path "/hello/world" :method :get
                           :response {:status 200 :body "literal"}}
                          {:path "/hello/:who" :method :get
                           :response {:status 200 :body "param"}}]
                         {:uri "/hello/clojure" :request-method :get})))))

(deftest nested-specificity-test
  (testing "More specific nested path beats less specific"
    (is (= {:status 200 :body "specific"}
           (ruuter/route [{:path "/api/:resource" :method :get
                           :response {:status 200 :body "generic"}}
                          {:path "/api/users" :method :get
                           :response {:status 200 :body "specific"}}]
                         {:uri "/api/users" :request-method :get}))))

  (testing "Deeper literal path beats shallow param"
    (is (= {:status 200 :body "deep-literal"}
           (ruuter/route [{:path "/api/:resource/:id" :method :get
                           :response {:status 200 :body "params"}}
                          {:path "/api/users/me" :method :get
                           :response {:status 200 :body "deep-literal"}}]
                         {:uri "/api/users/me" :request-method :get}))))

  (testing "Wildcard is last resort"
    (is (= {:status 200 :body "wildcard"}
           (ruuter/route [{:path "/hello/world" :method :get
                           :response {:status 200 :body "literal"}}
                          {:path "/hello/:who" :method :get
                           :response {:status 200 :body "param"}}
                          {:path "/hello/:catch*" :method :get
                           :response {:status 200 :body "wildcard"}}]
                         {:uri "/hello/a/b/c" :request-method :get})))))

;; ── Not-Found Fallback Tests ───────────────────────────────────────────

(deftest not-found-test
  (testing "Custom :not-found route is used when no match"
    (is (= {:status 404 :body "custom 404"}
           (ruuter/route [{:path "/hello" :method :get
                           :response {:status 200 :body "hi"}}
                          {:path :not-found
                           :response {:status 404 :body "custom 404"}}]
                         {:uri "/nope" :request-method :get}))))

  (testing "Custom :not-found route with fn response"
    (is (= {:status 404 :body "Not found: /nope"}
           (ruuter/route [{:path :not-found
                           :response (fn [req]
                                       {:status 404
                                        :body (str "Not found: " (:uri req))})}]
                         {:uri "/nope" :request-method :get}))))

  (testing "Built-in 404 when no :not-found route"
    (is (= {:status 404 :body "Not found."}
           (ruuter/route [{:path "/hello" :method :get
                           :response {:status 200 :body "hi"}}]
                         {:uri "/nope" :request-method :get})))))

;; ── Compile-Routes Tests ───────────────────────────────────────────────

(deftest compile-routes-test
  (testing "Pre-compiled routes work the same as raw routes"
    (let [routes [{:path "/hello/:who" :method :get
                   :response (fn [req]
                               {:status 200
                                :body (str "Hello, " (:who (:params req)))})}
                  {:path :not-found
                   :response {:status 404 :body "custom 404"}}]
          compiled (ruuter/compile-routes routes)]
      (is (= {:status 200 :body "Hello, world"}
             (ruuter/route compiled {:uri "/hello/world" :request-method :get})))
      (is (= {:status 404 :body "custom 404"}
             (ruuter/route compiled {:uri "/nope" :request-method :get}))))))

;; ── Edge Case Tests ────────────────────────────────────────────────────

(deftest trie-node-reuse-test
  (testing "Two routes sharing same param slot — trie reuses param node"
    (let [routes [{:path "/users/:id/profile" :method :get
                   :response {:status 200 :body "profile"}}
                  {:path "/users/:id/settings" :method :get
                   :response {:status 200 :body "settings"}}]]
      (is (= {:status 200 :body "profile"}
             (ruuter/route routes {:uri "/users/42/profile" :request-method :get})))
      (is (= {:status 200 :body "settings"}
             (ruuter/route routes {:uri "/users/42/settings" :request-method :get})))))

  (testing "Two routes sharing same optional slot — trie reuses optional node"
    (let [routes [{:path "/search/:q?/page" :method :get
                   :response {:status 200 :body "page"}}
                  {:path "/search/:q?/sort" :method :get
                   :response {:status 200 :body "sort"}}]]
      (is (= {:status 200 :body "page"}
             (ruuter/route routes {:uri "/search/foo/page" :request-method :get})))
      (is (= {:status 200 :body "sort"}
             (ruuter/route routes {:uri "/search/foo/sort" :request-method :get}))))))

(deftest edge-cases-test
  (testing "Trailing slash on root"
    (is (= {:status 200 :body "root"}
           (ruuter/route [{:path "/" :method :get
                           :response {:status 200 :body "root"}}]
                         {:uri "/" :request-method :get}))))

  (testing "Multiple HTTP methods on same path"
    (let [routes [{:path "/items" :method :get
                   :response {:status 200 :body "list"}}
                  {:path "/items" :method :post
                   :response {:status 201 :body "created"}}]]
      (is (= {:status 200 :body "list"}
             (ruuter/route routes {:uri "/items" :request-method :get})))
      (is (= {:status 201 :body "created"}
             (ruuter/route routes {:uri "/items" :request-method :post})))))

  (testing "Many overlapping routes — best match wins"
    (let [routes [{:path "/:catch*" :method :get
                   :response {:status 200 :body "catch-all"}}
                  {:path "/api/:resource" :method :get
                   :response {:status 200 :body "api-resource"}}
                  {:path "/api/users" :method :get
                   :response {:status 200 :body "api-users"}}
                  {:path "/api/users/:id" :method :get
                   :response {:status 200 :body "api-user-id"}}
                  {:path "/api/users/me" :method :get
                   :response {:status 200 :body "api-users-me"}}]]
      (is (= {:status 200 :body "api-users"}
             (ruuter/route routes {:uri "/api/users" :request-method :get})))
      (is (= {:status 200 :body "api-users-me"}
             (ruuter/route routes {:uri "/api/users/me" :request-method :get})))
      (is (= {:status 200 :body "api-user-id"}
             (ruuter/route routes {:uri "/api/users/42" :request-method :get})))
      (is (= {:status 200 :body "api-resource"}
             (ruuter/route routes {:uri "/api/posts" :request-method :get})))
      (is (= {:status 200 :body "catch-all"}
             (ruuter/route routes {:uri "/random/deep/path" :request-method :get}))))))

(deftest wildcard-reuse-test
  (testing "Multiple wildcards at same position in different routes"
    (is (= {:status 200 :body "get-files"}
           (ruuter/route [{:path "/files/:path*" :method :get
                           :response {:status 200 :body "get-files"}}
                          {:path "/files/:path*" :method :delete
                           :response {:status 200 :body "delete-files"}}]
                         {:uri "/files/a/b/c" :request-method :get})))
    (is (= {:status 200 :body "delete-files"}
           (ruuter/route [{:path "/files/:path*" :method :get
                           :response {:status 200 :body "get-files"}}
                          {:path "/files/:path*" :method :delete
                           :response {:status 200 :body "delete-files"}}]
                         {:uri "/files/a/b/c" :request-method :delete}))))

  (testing "Non-map non-fn response returns 404"
    (is (= {:status 404 :body "Not found."}
           (ruuter/route [{:path "/hello" :method :get
                           :response "just a string"}]
                         {:uri "/hello" :request-method :get})))))