package discord

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

	"git.daviestechlabs.io/daviestechlabs/ntfy-discord/internal/ntfy"
)

func TestClient_Send(t *testing.T) {
	tests := []struct {
		name       string
		msg        ntfy.Message
		wantStatus int
		wantErr    bool
	}{
		{
			name: "successful send",
			msg: ntfy.Message{
				ID:       "test-id",
				Topic:    "alerts",
				Title:    "Test Alert",
				Message:  "This is a test message",
				Priority: 3,
				Time:     time.Now().Unix(),
			},
			wantStatus: http.StatusNoContent,
			wantErr:    false,
		},
		{
			name: "high priority message",
			msg: ntfy.Message{
				ID:       "high-priority",
				Topic:    "urgent",
				Title:    "Urgent Alert",
				Message:  "Critical issue detected",
				Priority: 5,
				Tags:     []string{"warning", "fire"},
			},
			wantStatus: http.StatusNoContent,
			wantErr:    false,
		},
		{
			name: "server error",
			msg: ntfy.Message{
				ID:    "error-test",
				Topic: "test",
			},
			wantStatus: http.StatusInternalServerError,
			wantErr:    true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			var receivedPayload WebhookPayload

			server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				if r.Method != http.MethodPost {
					t.Errorf("expected POST, got %s", r.Method)
				}
				if r.Header.Get("Content-Type") != "application/json" {
					t.Errorf("expected application/json, got %s", r.Header.Get("Content-Type"))
				}

				if err := json.NewDecoder(r.Body).Decode(&receivedPayload); err != nil {
					t.Errorf("failed to decode payload: %v", err)
				}

				w.WriteHeader(tt.wantStatus)
			}))
			defer server.Close()

			client := NewClient()
			err := client.Send(context.Background(), server.URL, tt.msg)

			if (err != nil) != tt.wantErr {
				t.Errorf("Send() error = %v, wantErr %v", err, tt.wantErr)
			}

			if !tt.wantErr && len(receivedPayload.Embeds) != 1 {
				t.Errorf("expected 1 embed, got %d", len(receivedPayload.Embeds))
			}
		})
	}
}

func TestClient_Send_NoWebhookURL(t *testing.T) {
	client := NewClient()
	err := client.Send(context.Background(), "", ntfy.Message{})

	if err == nil {
		t.Error("expected error for empty webhook URL")
	}
}

func TestClient_buildEmbed(t *testing.T) {
	client := NewClient()

	tests := []struct {
		name      string
		msg       ntfy.Message
		wantColor int
		wantEmoji string
	}{
		{
			name: "default priority",
			msg: ntfy.Message{
				Title:    "Test",
				Message:  "Hello",
				Priority: 3,
			},
			wantColor: 3066993, // Blue
			wantEmoji: "",
		},
		{
			name: "max priority with warning tag",
			msg: ntfy.Message{
				Title:    "Alert",
				Message:  "Critical",
				Priority: 5,
				Tags:     []string{"warning"},
			},
			wantColor: 15158332, // Red
			wantEmoji: "⚠️",
		},
		{
			name: "low priority",
			msg: ntfy.Message{
				Title:    "Info",
				Message:  "Low priority",
				Priority: 2,
			},
			wantColor: 9807270, // Gray
			wantEmoji: "",
		},
		{
			name: "with check tag",
			msg: ntfy.Message{
				Title:    "Success",
				Message:  "Completed",
				Priority: 3,
				Tags:     []string{"check", "success"},
			},
			wantColor: 3066993,
			wantEmoji: "✅",
		},
		{
			name: "no title uses topic",
			msg: ntfy.Message{
				Topic:   "alerts",
				Message: "No title",
			},
			wantColor: 3066993,
			wantEmoji: "",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			embed := client.buildEmbed(tt.msg)

			if embed.Color != tt.wantColor {
				t.Errorf("Color = %d, want %d", embed.Color, tt.wantColor)
			}

			if tt.wantEmoji != "" {
				if len(embed.Title) < 2 || embed.Title[:len(tt.wantEmoji)] != tt.wantEmoji {
					t.Errorf("Title should start with emoji %s, got %s", tt.wantEmoji, embed.Title)
				}
			}

			if embed.Description != tt.msg.Message {
				t.Errorf("Description = %s, want %s", embed.Description, tt.msg.Message)
			}
		})
	}
}

func TestClient_extractEmoji(t *testing.T) {
	client := NewClient()

	tests := []struct {
		name string
		tags []string
		want string
	}{
		{"warning tag", []string{"warning"}, "⚠️"},
		{"check tag", []string{"check"}, "✅"},
		{"fire tag", []string{"fire"}, "🔥"},
		{"rocket tag", []string{"rocket"}, "🚀"},
		{"unknown tag", []string{"unknown"}, ""},
		{"empty tags", []string{}, ""},
		{"multiple tags first match", []string{"unknown", "fire", "warning"}, "🔥"},
		{"case insensitive", []string{"WARNING"}, "⚠️"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			got := client.extractEmoji(tt.tags)
			if got != tt.want {
				t.Errorf("extractEmoji(%v) = %s, want %s", tt.tags, got, tt.want)
			}
		})
	}
}

func TestPriorityColors(t *testing.T) {
	expected := map[int]int{
		1: 12370112, // Light Gray
		2: 9807270,  // Gray
		3: 3066993,  // Blue
		4: 15105570, // Orange
		5: 15158332, // Red
	}

	for priority, color := range expected {
		if priorityColors[priority] != color {
			t.Errorf("priorityColors[%d] = %d, want %d", priority, priorityColors[priority], color)
		}
	}
}

func TestWebhookPayload_JSON(t *testing.T) {
	payload := WebhookPayload{
		Embeds: []Embed{
			{
				Title:       "Test",
				Description: "Hello World",
				Color:       3066993,
				Fields: []Field{
					{Name: "Topic", Value: "alerts", Inline: true},
				},
				Footer: &Footer{Text: "ntfy"},
			},
		},
	}

	data, err := json.Marshal(payload)
	if err != nil {
		t.Fatalf("failed to marshal: %v", err)
	}

	var decoded WebhookPayload
	if err := json.Unmarshal(data, &decoded); err != nil {
		t.Fatalf("failed to unmarshal: %v", err)
	}

	if len(decoded.Embeds) != 1 {
		t.Errorf("expected 1 embed, got %d", len(decoded.Embeds))
	}

	if decoded.Embeds[0].Title != "Test" {
		t.Errorf("Title = %s, want Test", decoded.Embeds[0].Title)
	}
}