package main

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

	"github.com/multica-ai/multica/server/internal/cli"
)

func TestResolveAgent(t *testing.T) {
	agentsResp := []map[string]any{
		{"id": "11111111-1111-1111-1111-111111111111", "name": "Lambda"},
		{"id": "22222222-2222-2222-2222-222222222222", "name": "Codex Agent"},
		{"id": "33333333-3333-3333-3333-333333333333", "name": "Claude Reviewer"},
	}

	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path == "/api/agents" {
			json.NewEncoder(w).Encode(agentsResp)
			return
		}
		http.NotFound(w, r)
	}))
	defer srv.Close()

	client := cli.NewAPIClient(srv.URL, "ws-1", "test-token")
	ctx := context.Background()

	t.Run("passes through a UUID without lookup", func(t *testing.T) {
		id := "44444444-4444-4444-4444-444444444444"
		got, err := resolveAgent(ctx, client, id)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got != id {
			t.Errorf("got %q, want %q", got, id)
		}
	})

	t.Run("exact name match", func(t *testing.T) {
		got, err := resolveAgent(ctx, client, "Lambda")
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got != "11111111-1111-1111-1111-111111111111" {
			t.Errorf("got %q, want Lambda's UUID", got)
		}
	})

	t.Run("case-insensitive substring", func(t *testing.T) {
		got, err := resolveAgent(ctx, client, "codex")
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got != "22222222-2222-2222-2222-222222222222" {
			t.Errorf("got %q, want Codex Agent's UUID", got)
		}
	})

	t.Run("no match", func(t *testing.T) {
		_, err := resolveAgent(ctx, client, "nobody")
		if err == nil {
			t.Fatal("expected error for no match")
		}
	})

	t.Run("ambiguous match", func(t *testing.T) {
		_, err := resolveAgent(ctx, client, "a") // matches Lambda, Codex Agent, Claude Reviewer
		if err == nil {
			t.Fatal("expected error for ambiguous match")
		}
		if !strings.Contains(err.Error(), "ambiguous") {
			t.Errorf("expected ambiguous error, got: %v", err)
		}
	})

	t.Run("missing workspace ID for name lookup", func(t *testing.T) {
		noWSClient := cli.NewAPIClient(srv.URL, "", "test-token")
		_, err := resolveAgent(ctx, noWSClient, "Lambda")
		if err == nil {
			t.Fatal("expected error when workspace ID is missing")
		}
	})

	t.Run("UUID works without workspace ID", func(t *testing.T) {
		noWSClient := cli.NewAPIClient(srv.URL, "", "test-token")
		id := "55555555-5555-5555-5555-555555555555"
		got, err := resolveAgent(ctx, noWSClient, id)
		if err != nil {
			t.Fatalf("unexpected error: %v", err)
		}
		if got != id {
			t.Errorf("got %q, want %q", got, id)
		}
	})
}

func TestUUIDRegexp(t *testing.T) {
	tests := []struct {
		in   string
		want bool
	}{
		{"11111111-1111-1111-1111-111111111111", true},
		{"A1B2C3D4-1111-1111-1111-111111111111", true},
		{"not-a-uuid", false},
		{"11111111-1111-1111-1111-11111111111", false},   // too short
		{"11111111111111111111111111111111", false},      // missing dashes
		{"11111111-1111-1111-1111-1111111111111", false}, // too long
		{"", false},
	}
	for _, tt := range tests {
		if got := uuidRegexp.MatchString(tt.in); got != tt.want {
			t.Errorf("uuidRegexp.MatchString(%q) = %v, want %v", tt.in, got, tt.want)
		}
	}
}