package connector

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

	"gitea.com/gitea/gitea-mcp/pkg/flag"

	"github.com/modelcontextprotocol/go-sdk/mcp"
)

func withTestServer(t *testing.T, handler http.HandlerFunc) {
	t.Helper()
	server := httptest.NewServer(handler)
	t.Cleanup(server.Close)

	origHost, origToken := flag.Host, flag.Token
	flag.Host, flag.Token = server.URL, ""
	t.Cleanup(func() { flag.Host, flag.Token = origHost, origToken })
}

func resultText(t *testing.T, result *mcp.CallToolResult) string {
	t.Helper()
	text, ok := result.Content[0].(*mcp.TextContent)
	if !ok {
		t.Fatalf("result content = %T, want *mcp.TextContent", result.Content[0])
	}
	return text.Text
}

func TestSearchFnReturnsConciseRepoEntries(t *testing.T) {
	withTestServer(t, func(w http.ResponseWriter, r *http.Request) {
		if strings.HasSuffix(r.URL.Path, "/version") {
			_, _ = w.Write([]byte(`{"version":"1.26.0"}`))
			return
		}
		if !strings.HasSuffix(r.URL.Path, "/repos/search") {
			t.Fatalf("unexpected request path %q", r.URL.Path)
		}
		if q := r.URL.Query().Get("q"); q != "gitea-mcp" {
			t.Fatalf("query q = %q, want gitea-mcp", q)
		}
		_, _ = w.Write([]byte(`{"data":[{"id":42,"name":"gitea-mcp","full_name":"gitea/gitea-mcp","html_url":"https://gitea.com/gitea/gitea-mcp","description":"MCP server"}]}`))
	})

	result, err := SearchFn(context.Background(), map[string]any{"query": "gitea-mcp"})
	if err != nil {
		t.Fatalf("SearchFn() error = %v", err)
	}

	var entries []map[string]any
	if err := json.Unmarshal([]byte(resultText(t, result)), &entries); err != nil {
		t.Fatalf("unmarshal result: %v", err)
	}
	if len(entries) != 1 {
		t.Fatalf("len(entries) = %d, want 1", len(entries))
	}
	entry := entries[0]
	if entry["id"] != float64(42) {
		t.Errorf("id = %v, want 42", entry["id"])
	}
	if entry["name"] != "gitea-mcp" {
		t.Errorf("name = %v, want gitea-mcp", entry["name"])
	}
	if entry["url"] != "https://gitea.com/gitea/gitea-mcp" {
		t.Errorf("url = %v, want the repo html_url", entry["url"])
	}
	if entry["html_url"] != "https://gitea.com/gitea/gitea-mcp" {
		t.Errorf("html_url = %v, want the repo html_url", entry["html_url"])
	}
}

func TestSearchFnRequiresQuery(t *testing.T) {
	result, err := SearchFn(context.Background(), map[string]any{})
	if err != nil {
		t.Fatalf("SearchFn() error = %v", err)
	}
	if !result.IsError {
		t.Fatal("SearchFn() result.IsError = false, want true for a missing query")
	}
}

func TestSearchFnResolvesOwnerFilterToOwnerID(t *testing.T) {
	withTestServer(t, func(w http.ResponseWriter, r *http.Request) {
		switch {
		case strings.HasSuffix(r.URL.Path, "/version"):
			_, _ = w.Write([]byte(`{"version":"1.26.0"}`))
		case strings.HasSuffix(r.URL.Path, "/users/octo"):
			_, _ = w.Write([]byte(`{"id":7,"login":"octo"}`))
		case strings.HasSuffix(r.URL.Path, "/repos/search"):
			if uid := r.URL.Query().Get("uid"); uid != "7" {
				t.Fatalf("uid = %q, want 7", uid)
			}
			_, _ = w.Write([]byte(`{"data":[]}`))
		default:
			t.Fatalf("unexpected request path %q", r.URL.Path)
		}
	})

	if _, err := SearchFn(context.Background(), map[string]any{"query": "demo", "owner": "octo"}); err != nil {
		t.Fatalf("SearchFn() error = %v", err)
	}
}

func TestFetchFnReturnsDecodedContentAndMetadata(t *testing.T) {
	withTestServer(t, func(w http.ResponseWriter, r *http.Request) {
		if !strings.Contains(r.URL.Path, "/contents/") {
			t.Fatalf("unexpected request path %q", r.URL.Path)
		}
		_, _ = w.Write([]byte(`{"name":"README.md","path":"README.md","sha":"abc123","type":"file","size":11,"encoding":"base64","content":"aGVsbG8gd29ybGQ="}`))
	})

	result, err := FetchFn(context.Background(), map[string]any{
		"owner": "octo",
		"repo":  "demo",
		"path":  "README.md",
	})
	if err != nil {
		t.Fatalf("FetchFn() error = %v", err)
	}

	var got map[string]any
	if err := json.Unmarshal([]byte(resultText(t, result)), &got); err != nil {
		t.Fatalf("unmarshal result: %v", err)
	}
	if got["content"] != "hello world" {
		t.Errorf("content = %v, want decoded %q", got["content"], "hello world")
	}
	if got["path"] != "README.md" {
		t.Errorf("path = %v, want README.md", got["path"])
	}
	if got["sha"] != "abc123" {
		t.Errorf("sha = %v, want abc123", got["sha"])
	}
	if got["size"] != float64(11) {
		t.Errorf("size = %v, want 11", got["size"])
	}
	if got["encoding"] != "base64" {
		t.Errorf("encoding = %v, want base64", got["encoding"])
	}
}

func TestFetchFnRequiresPath(t *testing.T) {
	result, err := FetchFn(context.Background(), map[string]any{"owner": "octo", "repo": "demo"})
	if err != nil {
		t.Fatalf("FetchFn() error = %v", err)
	}
	if !result.IsError {
		t.Fatal("FetchFn() result.IsError = false, want true for a missing path")
	}
}