(binding [*compile-files* true]
  (require 'clojure.test))

(ns test-runner
  (:require [clojure.test :as t]))

(when-not (.exists (java.io.File. "classes"))
  (.. (java.io.File. "classes") mkdir))

(defmulti vim-report :type)

(defmethod vim-report :begin-test-ns [m]
  (println "\nTesting" (ns-name (:ns m))))

(defmethod vim-report :begin-test-var [m]
  (println "\nExecuting" (:name (meta (:var m)))))

(defmethod vim-report :fail
  [m]
  (t/with-test-out
    (when-let [source-file (some-> t/*testing-vars*
                                   first
                                   meta
                                   :file)]
      (println (str "FAIL:" source-file ":" (:line m) ":" (t/testing-vars-str m) ":" (t/testing-contexts-str) ":" (:message m "FAIL")))
      (println (str "FAIL-CONTINUE:EXPECTED:" (pr-str (:expected m))))
      (println (str "FAIL-CONTINUE:ACTUAL:" (pr-str (:actual m)))))))

(defn- find-line-number [source-file m]
  (if (instance? Throwable (:actual m))
    (let [fname (-> source-file (java.io.File.) (.getName))]
      (->> m
           :actual
           Throwable->map
           :trace
           (some (fn [[_ _ e-file e-line]]
                   (when (= e-file fname)
                     e-line)))))
    (:line m)))

(defmethod vim-report :error
  [m]
  (when-let [source-file (some-> t/*testing-vars*
                                 first
                                 meta
                                 :file)]
    (let [line (find-line-number source-file m)]
      (println (str "ERROR:" source-file ":" line ":" (t/testing-vars-str m) ":" (t/testing-contexts-str) ":" (:message m "FAIL")))
      (println (str "ERROR-CONTINUE:EXPECTED:" (pr-str (:expected m))))
      (println (str "ERROR-CONTINUE:ACTUAL:"
                    (if (instance? Throwable (:actual m))
                      (ex-message (:actual m))
                      (pr-str (:actual m))))))))

(defmethod vim-report :default
  [_])

(defn- clj-file? [f]
  (re-matches #"^.*\.cljs?$" (.getName f)))

(defn -main  [& {:strs [-test-file] :or {-test-file "test"}}]
  (binding  [*compile-files* true]
    (compile 'test-runner)
    (println "Detecting test files in" -test-file)
    (let [test-files (->> -test-file
                          (java.io.File.)
                          (file-seq)
                          (filter (memfn isFile))
                          (filter clj-file?)
                          (map (memfn getAbsolutePath))
                          (set))]
      (println "Loading test files...")
      (run! load-file test-files)
      (when (find-ns 'malli.core)
        (println "Malli detected. Instrument functions...")
        (require 'malli.dev)
        ((find-var 'malli.dev/start!)))
      (let [test-namespaces (->> (all-ns)
                                 (mapcat ns-publics)
                                 (map (comp meta second))
                                 (filter :test)
                                 (filter (comp test-files :file))
                                 (map :ns)
                                 (set))]
        (System/exit (if (pos? (reduce (fn [total-fails n]
                                         (with-redefs [t/report vim-report]
                                           (let [results (t/run-tests n)]
                                             (+ total-fails
                                                (:fail results 0)
                                                (:error results 0)))))
                                       0
                                       test-namespaces))
                       1
                       0))))))