## test_stats.nim
## ==============
## Tests unitaires des statistiques (compteurs jour/semaine et streak).
## Aucune écriture disque : on manipule directement la table `daily`.

import std/unittest
import std/times
import std/tables
import std/os
import std/strutils
import ../src/stats

suite "stats":
  test "initStats starts empty":
    let st = initStats()
    check st.completedToday() == 0
    check st.completedThisWeek() == 0
    check st.streak() == 0

  test "completedToday counts today's pomodoros":
    var st = initStats()
    st.daily[todayStr()] = 5
    check st.completedToday() == 5

  test "streak counts consecutive days ending today":
    var st = initStats()
    let today = now()
    for i in 0 ..< 3:
      st.daily[(today - i.days).format("yyyy-MM-dd")] = 1
    check st.streak() == 3

  test "streak starts from yesterday when today has no entry":
    var st = initStats()
    let today = now()
    st.daily[(today - 1.days).format("yyyy-MM-dd")] = 1
    st.daily[(today - 2.days).format("yyyy-MM-dd")] = 1
    check st.streak() == 2

  test "streak stops at the first gap":
    var st = initStats()
    let today = now()
    st.daily[today.format("yyyy-MM-dd")] = 1
    st.daily[(today - 1.days).format("yyyy-MM-dd")] = 1
    # jour -2 manquant (gap)
    st.daily[(today - 3.days).format("yyyy-MM-dd")] = 1
    check st.streak() == 2

  test "completedThisWeek sums the last 7 days":
    var st = initStats()
    let today = now()
    for i in 0 ..< 7:
      st.daily[(today - i.days).format("yyyy-MM-dd")] = 1
    check st.completedThisWeek() == 7

  test "totalPomodoros sums the whole history":
    var st = initStats()
    st.daily["2026-01-01"] = 2
    st.daily["2026-01-02"] = 3
    st.daily["2026-01-03"] = 5
    check st.totalPomodoros() == 10

  test "goalReached is true only when the goal is exactly met":
    var st = initStats()
    st.daily[todayStr()] = 8
    check st.goalReached(8)
    check not st.goalReached(4)
    check not st.goalReached(0)   # objectif 0 = désactivé

  test "lastNDays returns n entries including empty days":
    var st = initStats()
    let today = now()
    st.daily[today.format("yyyy-MM-dd")] = 4
    let rows = st.lastNDays(7)
    check rows.len == 7
    # Le dernier élément correspond à aujourd'hui.
    check rows[^1][0] == today.format("yyyy-MM-dd")
    check rows[^1][1] == 4

  test "exportCsv writes date,count lines":
    var st = initStats()
    st.daily["2026-08-13"] = 3
    st.daily["2026-08-14"] = 5
    let path = getTempDir() / "nimpulse_test_export.csv"
    check st.exportCsv(path)
    let content = readFile(path)
    check content.contains("date,count")
    check content.contains("2026-08-13,3")
    check content.contains("2026-08-14,5")
    removeFile(path)

suite "stats persistence":
  test "saveStats then loadStats round-trips":
    # Isole l'écriture disque dans un APPDATA temporaire.
    let tmpApd = getTempDir() / "nimpulse_test_stats"
    if dirExists(tmpApd):
      removeDir(tmpApd)
    putEnv("APPDATA", tmpApd)

    var st = initStats()
    st.daily["2026-08-13"] = 3
    st.daily["2026-08-14"] = 5
    saveStats(st)

    let loaded = loadStats()
    check loaded.daily["2026-08-13"] == 3
    check loaded.daily["2026-08-14"] == 5