(ns pocketbook.db-test
  (:require [clojure.test :refer [deftest is testing use-fixtures]]
            [pocketbook.db :as db])
  (:import [java.io File]))

(def ^:dynamic *ds* nil)

(defn- temp-db-path []
  (str (File/createTempFile "pocketbook-test" ".db")))

(use-fixtures :each
  (fn [f]
    (let [path (temp-db-path)
          ds   (db/open path)]
      (try
        (binding [*ds* ds]
          (f))
        (finally
          (.delete (File. path)))))))

;; ---------------------------------------------------------------------------
;; Basic CRUD
;; ---------------------------------------------------------------------------

(deftest upsert-new-doc
  (let [result (db/upsert! *ds* {:id "todo:1"
                                  :value {:text "Buy milk" :tags #{:groceries}}
                                  :base-version 0})]
    (is (= :ok (:status result)))
    (is (= 1 (:version result)))
    (let [doc (db/get-doc *ds* "todo:1")]
      (is (= "todo:1" (:id doc)))
      (is (= {:text "Buy milk" :tags #{:groceries}} (:value doc)))
      (is (= 1 (:version doc)))
      (is (false? (:deleted doc))))))

(deftest upsert-update-doc
  (db/upsert! *ds* {:id "todo:1" :value {:text "v1"} :base-version 0})
  (let [result (db/upsert! *ds* {:id "todo:1" :value {:text "v2"} :base-version 1})]
    (is (= :ok (:status result)))
    (is (= 2 (:version result)))
    (is (= {:text "v2"} (:value (db/get-doc *ds* "todo:1"))))))

(deftest upsert-conflict
  (db/upsert! *ds* {:id "todo:1" :value {:text "v1"} :base-version 0})
  (let [result (db/upsert! *ds* {:id "todo:1" :value {:text "bad"} :base-version 0})]
    (is (= :conflict (:status result)))
    (is (= 1 (:current-version result)))
    ;; Original doc unchanged
    (is (= {:text "v1"} (:value (db/get-doc *ds* "todo:1"))))))

(deftest upsert-conflict-stale-version
  (db/upsert! *ds* {:id "todo:1" :value {:text "v1"} :base-version 0})
  (db/upsert! *ds* {:id "todo:1" :value {:text "v2"} :base-version 1})
  (let [result (db/upsert! *ds* {:id "todo:1" :value {:text "bad"} :base-version 1})]
    (is (= :conflict (:status result)))
    (is (= 2 (:current-version result)))
    (is (= {:text "v2"} (:value result)))))

;; ---------------------------------------------------------------------------
;; Delete
;; ---------------------------------------------------------------------------

(deftest soft-delete
  (db/upsert! *ds* {:id "todo:1" :value {:text "v1"} :base-version 0})
  (let [result (db/delete! *ds* {:id "todo:1" :base-version 1})]
    (is (= :ok (:status result)))
    (is (= 2 (:version result)))
    (let [doc (db/get-doc *ds* "todo:1")]
      (is (true? (:deleted doc)))
      (is (= 2 (:version doc))))))

(deftest delete-conflict
  (db/upsert! *ds* {:id "todo:1" :value {:text "v1"} :base-version 0})
  (let [result (db/delete! *ds* {:id "todo:1" :base-version 0})]
    (is (= :conflict (:status result)))
    (is (= 1 (:current-version result)))))

;; ---------------------------------------------------------------------------
;; Queries
;; ---------------------------------------------------------------------------

(deftest docs-since-filters-by-group-and-time
  (db/upsert! *ds* {:id "todo:1" :value {:text "a"} :base-version 0})
  (Thread/sleep 10)
  (let [t (System/currentTimeMillis)]
    (Thread/sleep 10)
    (db/upsert! *ds* {:id "todo:2" :value {:text "b"} :base-version 0})
    (db/upsert! *ds* {:id "note:1" :value {:text "c"} :base-version 0})
    (let [docs (db/docs-since *ds* "todo" t)]
      (is (= 1 (count docs)))
      (is (= "todo:2" (:id (first docs)))))))

(deftest all-docs-excludes-deleted
  (db/upsert! *ds* {:id "todo:1" :value {:text "a"} :base-version 0})
  (db/upsert! *ds* {:id "todo:2" :value {:text "b"} :base-version 0})
  (db/delete! *ds* {:id "todo:1" :base-version 1})
  (let [docs (db/all-docs *ds* "todo")]
    (is (= 1 (count docs)))
    (is (= "todo:2" (:id (first docs))))))

;; ---------------------------------------------------------------------------
;; Clojure type preservation
;; ---------------------------------------------------------------------------

(deftest preserves-clojure-types
  (let [value {:keyword :hello
               :set     #{1 2 3}
               :vec     [1 "two" :three]
               :uuid    (java.util.UUID/randomUUID)
               :inst    #inst "2026-04-04T10:00:00Z"
               :nested  {:a {:b {:c 42}}}
               :nil-val nil
               :ratio   22/7
               :symbol  'my-sym}]
    (db/upsert! *ds* {:id "types:1" :value value :base-version 0})
    (let [doc (db/get-doc *ds* "types:1")]
      (is (= (:keyword value) (:keyword (:value doc))))
      (is (= (:set value)     (:set (:value doc))))
      (is (= (:vec value)     (:vec (:value doc))))
      (is (= (:uuid value)    (:uuid (:value doc))))
      (is (= (:inst value)    (:inst (:value doc))))
      (is (= (:nested value)  (:nested (:value doc))))
      (is (nil? (:nil-val (:value doc))))
      (is (= (:symbol value)  (:symbol (:value doc)))))))

;; ---------------------------------------------------------------------------
;; Purge
;; ---------------------------------------------------------------------------

(deftest purge-deleted-removes-old
  (db/upsert! *ds* {:id "todo:1" :value {:text "a"} :base-version 0})
  (db/delete! *ds* {:id "todo:1" :base-version 1})
  ;; Wait a tick so the updated timestamp is in the past
  (Thread/sleep 20)
  ;; Purge with a large max-age window — recent deletes are kept
  (db/purge-deleted! *ds* 999999)
  (is (some? (db/get-doc *ds* "todo:1")))
  ;; Purge with a tiny max-age — everything older than 10ms ago is removed
  (db/purge-deleted! *ds* 10)
  (is (nil? (db/get-doc *ds* "todo:1"))))