package api

import (
	"bytes"
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"testing"
	"time"

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

	"git.fabledsword.com/bvandeusen/minstrel/internal/auth"
	"git.fabledsword.com/bvandeusen/minstrel/internal/library"
)

func newAdminScheduleRouter(h *handlers) chi.Router {
	r := chi.NewRouter()
	r.Route("/api/admin", func(admin chi.Router) {
		admin.Use(auth.RequireAdmin())
		admin.Get("/scan/schedule", h.handleGetScanSchedule)
		admin.Patch("/scan/schedule", h.handlePatchScanSchedule)
	})
	return r
}

func TestAdminScanSchedule_Get_DefaultIsOff(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	s := library.NewScheduler(pool, h.logger, nil, nil, library.RunScanConfig{})
	h.scheduler = s
	admin := seedUser(t, pool, "schedget", "pw", true)

	req := httptest.NewRequest(http.MethodGet, "/api/admin/scan/schedule", nil)
	req = withUser(req, admin)
	rec := httptest.NewRecorder()
	newAdminScheduleRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp scanScheduleResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.Mode != "off" {
		t.Errorf("Mode = %q, want off", resp.Mode)
	}
	if resp.NextScheduledAt != nil {
		t.Errorf("NextScheduledAt = %v, want nil for mode=off", resp.NextScheduledAt)
	}
}

func TestAdminScanSchedule_Patch_DailyMode(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	s := library.NewScheduler(pool, h.logger, nil, nil, library.RunScanConfig{})
	h.scheduler = s
	admin := seedUser(t, pool, "schedpatch", "pw", true)

	body := `{"mode":"daily","time_of_day":"03:00"}`
	req := httptest.NewRequest(http.MethodPatch, "/api/admin/scan/schedule",
		bytes.NewReader([]byte(body)))
	req.Header.Set("Content-Type", "application/json")
	req = withUser(req, admin)
	rec := httptest.NewRecorder()
	newAdminScheduleRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}
	var resp scanScheduleResp
	if err := json.Unmarshal(rec.Body.Bytes(), &resp); err != nil {
		t.Fatalf("decode: %v", err)
	}
	if resp.Mode != "daily" {
		t.Errorf("Mode = %q, want daily", resp.Mode)
	}
	if resp.TimeOfDay == nil || *resp.TimeOfDay != "03:00" {
		t.Errorf("TimeOfDay = %v, want '03:00'", resp.TimeOfDay)
	}
	if resp.NextScheduledAt == nil {
		t.Errorf("NextScheduledAt = nil, want a future ISO timestamp")
	} else {
		next, err := time.Parse(time.RFC3339, *resp.NextScheduledAt)
		if err != nil {
			t.Errorf("NextScheduledAt parse: %v", err)
		} else if local := next.Local(); local.Hour() != 3 || local.Minute() != 0 {
			// Handler computes next-fire from time.Now() in the host zone, so
			// the local-time hour is what's stable across CI runners regardless
			// of TZ; the wire timestamp is UTC but parses back to the same
			// instant either way.
			t.Errorf("NextScheduledAt local time = %v, want 03:00 in host zone", local)
		}
	}
}

func TestAdminScanSchedule_Patch_WeeklyMissingDay_400(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	s := library.NewScheduler(pool, h.logger, nil, nil, library.RunScanConfig{})
	h.scheduler = s
	admin := seedUser(t, pool, "schedweekly", "pw", true)

	body := `{"mode":"weekly","time_of_day":"03:00"}`
	req := httptest.NewRequest(http.MethodPatch, "/api/admin/scan/schedule",
		bytes.NewReader([]byte(body)))
	req.Header.Set("Content-Type", "application/json")
	req = withUser(req, admin)
	rec := httptest.NewRecorder()
	newAdminScheduleRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusBadRequest {
		t.Errorf("status = %d, want 400; body=%s", rec.Code, rec.Body.String())
	}
}

func TestAdminScanSchedule_Patch_OffNormalizes(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	s := library.NewScheduler(pool, h.logger, nil, nil, library.RunScanConfig{})
	h.scheduler = s
	admin := seedUser(t, pool, "schedoff", "pw", true)

	if _, err := pool.Exec(context.Background(),
		`UPDATE scan_schedule SET mode='daily', time_of_day='03:00' WHERE id=true`,
	); err != nil {
		t.Fatalf("seed: %v", err)
	}

	body := `{"mode":"off","time_of_day":"03:00"}`
	req := httptest.NewRequest(http.MethodPatch, "/api/admin/scan/schedule",
		bytes.NewReader([]byte(body)))
	req.Header.Set("Content-Type", "application/json")
	req = withUser(req, admin)
	rec := httptest.NewRecorder()
	newAdminScheduleRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want 200; body=%s", rec.Code, rec.Body.String())
	}

	var timeOfDay *string
	if err := pool.QueryRow(context.Background(),
		`SELECT time_of_day FROM scan_schedule WHERE id=true`,
	).Scan(&timeOfDay); err != nil {
		t.Fatalf("verify: %v", err)
	}
	if timeOfDay != nil {
		t.Errorf("time_of_day = %v, want nil after mode=off normalize", timeOfDay)
	}
}

func TestAdminScanSchedule_NonAdmin_403(t *testing.T) {
	if os.Getenv("MINSTREL_TEST_DATABASE_URL") == "" {
		t.Skip("MINSTREL_TEST_DATABASE_URL not set")
	}
	h, pool := testHandlers(t)
	s := library.NewScheduler(pool, h.logger, nil, nil, library.RunScanConfig{})
	h.scheduler = s
	user := seedUser(t, pool, "schednonadmin", "pw", false)

	req := httptest.NewRequest(http.MethodGet, "/api/admin/scan/schedule", nil)
	req = withUser(req, user)
	rec := httptest.NewRecorder()
	newAdminScheduleRouter(h).ServeHTTP(rec, req)

	if rec.Code != http.StatusForbidden {
		t.Errorf("status = %d, want 403", rec.Code)
	}
}