package main

import (
	"bytes"
	"context"
	"encoding/csv"
	"encoding/json"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"path"
	"strconv"
	"strings"
	"testing"
	"time"
)

func TestRun(t *testing.T) {
	ctx, can := context.WithTimeout(context.Background(), time.Second*10)
	defer can()

	port := func() int {
		s := httptest.NewServer(http.HandlerFunc(http.NotFound))
		s.Close()
		u, err := url.Parse(s.URL)
		if err != nil {
			t.Fatal(err)
		}
		portS := strings.Split(u.Host, ":")[1]
		port, err := strconv.ParseInt(portS, 10, 32)
		if err != nil {
			t.Fatal(err)
		}
		return int(port)
	}()
	u := fmt.Sprintf("http://localhost:%d", port)

	cfg := Config{}
	cfg.DatacenterPattern = renderDatacenterPattern
	cfg.AssetPattern = renderAssetPattern
	cfg.EventNamePattern = renderEventNamePattern
	cfg.Port = port
	cfg.driver, _ = NewDriver(ctx, "")
	cfg.slackToMessagePipeline, _ = NewSlackToMessagePipeline(ctx, cfg)
	cfg.SlackToken = "redacted"
	cfg.SlackChannels = []string{"C06U1DDBBU4"}

	go func() {
		if err := run(ctx, cfg); err != nil && ctx.Err() == nil {
			t.Fatal(err)
		}
	}()

	for {
		if resp, err := http.Get(u); err == nil {
			resp.Body.Close()
			break
		}
		select {
		case <-ctx.Done():
			t.Fatal(ctx.Err())
		case <-time.After(time.Millisecond * 50):
		}
	}

	t.Run("POST /api/v1/events/slack", func(t *testing.T) {
		b, err := os.ReadFile(path.Join("testdata", "slack_events", "opsgenie_alert_3.json"))
		if err != nil {
			t.Fatal(err)
		}
		resp, err := http.Post(fmt.Sprintf("%s/api/v1/events/slack", u), "application/json", bytes.NewReader(b))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}
	})

	t.Run("GET /api/v1/messages", func(t *testing.T) {
		resp, err := http.Get(fmt.Sprintf("%s/api/v1/messages", u))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}
		var result struct {
			Messages []Message
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			t.Fatal(err)
		} else if len(result.Messages) != 1 {
			t.Fatal(result.Messages)
		} else {
			t.Logf("%+v", result)
		}
	})

	t.Run("GET /api/v1/eventnames", func(t *testing.T) {
		resp, err := http.Get(fmt.Sprintf("%s/api/v1/eventnames", u))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}
		var result struct {
			EventNames []string
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			t.Fatal(err)
		} else if result.EventNames[0] != "Wal Receive Count Alert" {
			t.Fatal(result.EventNames)
		} else {
			t.Logf("%+v", result)
		}
	})

	t.Run("GET /api/v1/events", func(t *testing.T) {
		resp, err := http.Get(fmt.Sprintf("%s/api/v1/events", u))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}
		var result struct {
			Events []string
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			t.Fatal(err)
		} else if result.Events[0] != "11067" {
			t.Fatal(result.Events)
		} else {
			t.Logf("%+v", result)
		}
	})

	t.Run("GET /api/v1/threads", func(t *testing.T) {
		resp, err := http.Get(fmt.Sprintf("%s/api/v1/threads", u))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}
		var result struct {
			Threads []string
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			t.Fatal(err)
		} else if result.Threads[0] != "1712911957.023359" {
			t.Fatal(result.Threads)
		} else {
			t.Logf("%+v", result)
		}
	})

	t.Run("GET /api/v1/threads/1712911957.023359", func(t *testing.T) {
		resp, err := http.Get(fmt.Sprintf("%s/api/v1/threads/1712911957.023359", u))
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}

		var result struct {
			Thread []Message
		}
		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			t.Fatal(err)
		} else if len(result.Thread) != 1 {
			t.Fatal(result.Thread)
		} else {
			t.Logf("%+v", result)
		}
	})

	t.Run("CSV GET /api/v1/threads/1712911957.023359", func(t *testing.T) {
		req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/api/v1/threads/1712911957.023359", u), nil)
		if err != nil {
			t.Fatal(err)
		}
		req.Header.Set("Accept", "text/csv")

		resp, err := http.DefaultClient.Do(req)
		if err != nil {
			t.Fatal(err)
		}
		defer resp.Body.Close()

		if resp.StatusCode != http.StatusOK {
			b, _ := io.ReadAll(resp.Body)
			t.Fatalf("(%d) %s", resp.StatusCode, b)
		}

		b, _ := io.ReadAll(resp.Body)
		t.Logf("whole csv: \n%s", b)

		dec := csv.NewReader(bytes.NewReader(b))
		var lastLine []string
		for {
			line, err := dec.Read()
			if err == io.EOF {
				break
			} else if err != nil {
				t.Error("unexpected error while reading csv line:", err)
			}

			if lastLine == nil {
			} else if len(lastLine) != len(line) {
				t.Errorf("last line had %v elements but this line has %v", len(lastLine), len(line))
			}

			t.Logf("CSV line: %+v", line)
			lastLine = line
		}
		if lastLine == nil {
			t.Error("no lines found")
		}

	})
}