package api_test

import (
	"net/http"
	"testing"
)

// TestConfigSetVersioning exercises the set update/version/promote/fork/diff and
// snapshot endpoints that the base end-to-end test does not reach.
func TestConfigSetVersioning(t *testing.T) {
	srv, teardown := setup(t)
	defer teardown()

	mk := func(name string) string {
		resp := postJSON(t, srv, "/api/v1/config/sets", map[string]any{
			"name": name,
			"parameters": []map[string]any{
				{"key": "sp", "ds": "stub", "signal": "setpoint", "type": "float64", "default": 1.0},
			},
		})
		assertStatus(t, resp, http.StatusCreated)
		var s struct {
			ID string `json:"id"`
		}
		readJSON(t, resp, &s)
		return s.ID
	}

	id := mk("Set A")

	// Update → version bump + backup.
	resp := putRaw(t, srv, "/api/v1/config/sets/"+id, "application/json",
		[]byte(`{"name":"Set A v2","parameters":[{"key":"sp","ds":"stub","signal":"setpoint","type":"float64","default":2.0}]}`))
	assertStatus(t, resp, http.StatusOK)

	// List versions.
	resp = get(t, srv, "/api/v1/config/sets/"+id+"/versions")
	assertStatus(t, resp, http.StatusOK)
	var versions []map[string]any
	readJSON(t, resp, &versions)
	if len(versions) < 2 {
		t.Fatalf("expected >=2 set versions, got %d", len(versions))
	}

	// Get a specific version.
	resp = get(t, srv, "/api/v1/config/sets/"+id+"/versions/1")
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Promote v1.
	resp = postRaw(t, srv, "/api/v1/config/sets/"+id+"/versions/1/promote", "application/json", nil)
	assertStatus(t, resp, http.StatusOK)

	// Fork v1 → new set id.
	resp = postRaw(t, srv, "/api/v1/config/sets/"+id+"/versions/1/fork", "application/json", nil)
	assertStatus(t, resp, http.StatusCreated)
	var fork struct {
		ID string `json:"id"`
	}
	readJSON(t, resp, &fork)
	if fork.ID == "" || fork.ID == id {
		t.Errorf("fork id = %q, want fresh id", fork.ID)
	}

	// Diff the original against the fork.
	resp = get(t, srv, "/api/v1/config/sets/diff?a="+id+"&b="+fork.ID)
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Diff with a missing left id → 400.
	resp = get(t, srv, "/api/v1/config/sets/diff?a=&b="+fork.ID)
	assertStatus(t, resp, http.StatusBadRequest)

	// Snapshot the set into a new instance.
	resp = postJSON(t, srv, "/api/v1/config/sets/"+id+"/snapshot", map[string]any{"name": "snap-1"})
	assertStatus(t, resp, http.StatusCreated)
	resp.Body.Close()
}

// TestConfigInstanceVersioning exercises the instance update/version/promote/
// fork/validate and live-diff endpoints.
func TestConfigInstanceVersioning(t *testing.T) {
	srv, teardown := setup(t)
	defer teardown()

	// A set to bind instances to.
	resp := postJSON(t, srv, "/api/v1/config/sets", map[string]any{
		"name": "Set B",
		"parameters": []map[string]any{
			{"key": "sp", "ds": "stub", "signal": "setpoint", "type": "float64", "default": 1.0},
		},
	})
	assertStatus(t, resp, http.StatusCreated)
	var set struct {
		ID string `json:"id"`
	}
	readJSON(t, resp, &set)

	// Create an instance.
	resp = postJSON(t, srv, "/api/v1/config/instances", map[string]any{
		"name": "inst", "setId": set.ID, "values": map[string]any{"sp": 5.0},
	})
	assertStatus(t, resp, http.StatusCreated)
	var inst struct {
		ID string `json:"id"`
	}
	readJSON(t, resp, &inst)

	// Get it.
	resp = get(t, srv, "/api/v1/config/instances/"+inst.ID)
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// List instances.
	resp = get(t, srv, "/api/v1/config/instances")
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Update → version bump.
	resp = putRaw(t, srv, "/api/v1/config/instances/"+inst.ID, "application/json",
		[]byte(`{"name":"inst v2","setId":"`+set.ID+`","values":{"sp":7.0}}`))
	assertStatus(t, resp, http.StatusOK)

	// List versions.
	resp = get(t, srv, "/api/v1/config/instances/"+inst.ID+"/versions")
	assertStatus(t, resp, http.StatusOK)
	var versions []map[string]any
	readJSON(t, resp, &versions)
	if len(versions) < 2 {
		t.Fatalf("expected >=2 instance versions, got %d", len(versions))
	}

	// Get a version.
	resp = get(t, srv, "/api/v1/config/instances/"+inst.ID+"/versions/1")
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Promote + fork.
	resp = postRaw(t, srv, "/api/v1/config/instances/"+inst.ID+"/versions/1/promote", "application/json", nil)
	assertStatus(t, resp, http.StatusOK)
	resp = postRaw(t, srv, "/api/v1/config/instances/"+inst.ID+"/versions/1/fork", "application/json", nil)
	assertStatus(t, resp, http.StatusCreated)
	resp.Body.Close()

	// Validate against the (empty) rule set → 200.
	resp = postJSON(t, srv, "/api/v1/config/instances/"+inst.ID+"/validate", nil)
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Live diff against current signal values → 200.
	resp = get(t, srv, "/api/v1/config/instances/"+inst.ID+"/livediff")
	assertStatus(t, resp, http.StatusOK)
	resp.Body.Close()

	// Delete the instance.
	resp = deleteReq(t, srv, "/api/v1/config/instances/"+inst.ID)
	assertStatus(t, resp, http.StatusNoContent)
}