package smoke

import (
	"bytes"
	"encoding/json"
	"fmt"
	"testing"
	"text/template"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/target/goalert/test/smoke/harness"
	"github.com/target/goalert/user"
)

// TestGraphQLOnCall tests the logic behind `User.is_on_call`.
func TestGraphQLOnCall(t *testing.T) {
	t.Parallel()

	doQL := func(t *testing.T, h *harness.Harness, query string, res interface{}) {
		g := h.GraphQLQueryT(t, query)
		for _, err := range g.Errors {
			t.Error("GraphQL Error:", err.Message)
		}
		if len(g.Errors) > 0 {
			t.Fatal("errors returned from GraphQL")
		}
		t.Log("Response:", string(g.Data))

		if res == nil {
			return
		}
		err := json.Unmarshal(g.Data, &res)
		if err != nil {
			t.Fatal(err)
		}
	}

	var idCounter int

	check := func(name, tmplStr string, isUser1OnCall, isUser2OnCall bool) {
		t.Helper()
		var data struct {
			UniqName string
			User1    *user.User
			User2    *user.User
		}
		data.UniqName = fmt.Sprintf("generated%d", idCounter)
		idCounter++

		tmpl, err := template.New("mutation").Parse(tmplStr)
		require.NoError(t, err)

		t.Run(name, func(t *testing.T) {
			t.Parallel()
			h := harness.NewHarness(t, "", "escalation-policy-step-reorder")
			defer h.Close()

			u1, u2 := h.CreateUser(), h.CreateUser()
			data.User1 = u1
			data.User2 = u2

			var buf bytes.Buffer
			err = tmpl.Execute(&buf, data)
			require.NoError(t, err)

			query := buf.String()

			doQL(t, h, query, nil)
			h.Trigger()

			var onCall struct {
				User1, User2 struct {
					OnCallSteps []struct{ ID string }
				}
			}

			doQL(t, h, fmt.Sprintf(`
				query {
					user1: user(id: "%s") { onCallSteps{id} }
					user2: user(id: "%s") { onCallSteps{id} }
				}
			`, u1.ID, u2.ID), &onCall)

			assert.Equal(t, isUser1OnCall, len(onCall.User1.OnCallSteps) > 0, "User1 On-Call")
			assert.Equal(t, isUser2OnCall, len(onCall.User2.OnCallSteps) > 0, "User2 On-Call")
		})
	}

	// User directly on EP is always on call
	check("User EP Direct", `
		mutation{
			createService(input:{
				name: "{{.UniqName}}",
				newEscalationPolicy: {
					name: "{{.UniqName}}",
					steps: [{
						delayMinutes: 1,
						targets: [{type: user, id: "{{.User1.ID}}" }]
					}]
				}
			}){id}
		}
	`, true, false)

	// Active participant directly on EP is always on call
	check("User EP Rotation Direct", `
		mutation{
			createService(input:{
				name: "{{.UniqName}}",
				newEscalationPolicy: {
					name: "{{.UniqName}}",
					steps: [{
						delayMinutes: 1,
						newRotation: {
							name: "{{.UniqName}}",
							type: weekly,
							start: "2006-01-02T15:04:05Z",
							timeZone: "UTC",
							userIDs: ["{{.User1.ID}}"]
						}
					}]
				}
			}){id}
		}
	`, true, false)

	// EP -> Schedule, where there is an active ADD for a user
	check("User EP Schedule Add Override", `
		mutation{
			createService(input:{
				name: "{{.UniqName}}",
				newEscalationPolicy: {
					name: "{{.UniqName}}",
					steps: [{
						delayMinutes: 1,
						newSchedule: {
							name: "{{.UniqName}}",
							timeZone: "UTC",
							newUserOverrides: [{
								addUserID: "{{.User1.ID}}",
								start: "1006-01-02T15:04:05Z",
								end: "4006-01-02T15:04:05Z"
							}]
						}
					}]
				}
			}){id}
		}
	`, true, false)

	// Active schedule rule, user is replaced
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											target: { id: "{{.User2.ID}}", type: user }
											rules: [
												{
													start: "00:00"
													end: "23:59"
													weekdayFilter: [true, true, true, true, true, true, true]
												}
											]
										}
									]
									newUserOverrides: [
										{
											addUserID: "{{.User1.ID}}"
											removeUserID: "{{.User2.ID}}",
											start: "1006-01-02T15:04:05Z"
											end: "4006-01-02T15:04:05Z"
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, true, false)

	// Same scenario, user is NOT replaced (no override)
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											target: { id: "{{.User2.ID}}", type: user }
											rules: [
												{
													start: "00:00"
													end: "23:59"
													weekdayFilter: [true, true, true, true, true, true, true]
												}
											]
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, false, true)

	// Active schedule rule, active rotation participant is replaced
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											newRotation: {
												name: "{{.UniqName}}",
												type: weekly,
												start: "2006-01-02T15:04:05Z",
												timeZone: "UTC",
												userIDs: ["{{.User2.ID}}"]
											}
											rules: [{}]
										}
									]
									newUserOverrides: [
										{
											addUserID: "{{.User1.ID}}"
											removeUserID: "{{.User2.ID}}",
											start: "1006-01-02T15:04:05Z"
											end: "4006-01-02T15:04:05Z"
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, true, false)

	// Active schedule rule, active rotation participant is NOT replaced (no override)
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											newRotation: {
												name: "{{.UniqName}}",
												type: weekly,
												start: "2006-01-02T15:04:05Z",
												timeZone: "UTC",
												userIDs: ["{{.User2.ID}}"]
											}
											rules: [
												{
													start: "00:00"
													end: "23:59"
													weekdayFilter: [true, true, true, true, true, true, true]
												}
											]
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, false, true)

	// Active schedule rule, active rotation participant is removed
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											newRotation: {
												name: "{{.UniqName}}",
												type: weekly,
												start: "2006-01-02T15:04:05Z",
												timeZone: "UTC",
												userIDs: ["{{.User2.ID}}"]
											}
											rules: [
												{
													start: "00:00"
													end: "23:59"
													weekdayFilter: [true, true, true, true, true, true, true]
												}
											]
										}
									]
									newUserOverrides: [
										{
											removeUserID: "{{.User2.ID}}",
											start: "1006-01-02T15:04:05Z"
											end: "4006-01-02T15:04:05Z"
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, false, false)

	// Active schedule rule, user is removed
	check("User EP Schedule Add Override", `
		mutation {
			createService(
				input: {
					name: "{{.UniqName}}"
					newEscalationPolicy: {
						name: "{{.UniqName}}"
						steps: [
							{
								delayMinutes: 1
								newSchedule: {
									name: "{{.UniqName}}"
									timeZone: "UTC"
									targets: [
										{
											target: { id: "{{.User2.ID}}", type: user }
											rules: [
												{
													start: "00:00"
													end: "23:59"
													weekdayFilter: [true, true, true, true, true, true, true]
												}
											]
										}
									]
									newUserOverrides: [
										{
											removeUserID: "{{.User2.ID}}",
											start: "1006-01-02T15:04:05Z"
											end: "4006-01-02T15:04:05Z"
										}
									]
								}
							}
						]
					}
				}
			) {
				id
			}
			}
	`, false, false)
}