package plugin

import (
	"context"
	"encoding/json"
	"fmt"
	"os"
	"os/exec"
	"path/filepath"
	"strconv"
	"strings"
	"testing"
	"time"

	"reasonix/internal/secrets"
	"reasonix/internal/tool"
)

// TestChromeDevtoolsMCPLive is an opt-in release smoke test for the real npm
// package and local Chrome. It stays skipped in normal CI because it requires
// network access, npx, and a graphical Chrome installation.
//
// Run with:
//
//	REASONIX_LIVE_CHROME_MCP=1 go test ./internal/plugin \
//	  -run '^TestChromeDevtoolsMCPLive$' -v -count=1 -timeout=3m
func TestChromeDevtoolsMCPLive(t *testing.T) {
	if os.Getenv("REASONIX_LIVE_CHROME_MCP") != "1" {
		t.Skip("set REASONIX_LIVE_CHROME_MCP=1 to run the real Chrome MCP smoke test")
	}
	// The package TestMain redirects HOME to keep normal tests isolated. A login
	// shell under that empty home cannot load the user's Node manager and would
	// incorrectly prepend /usr/local/bin over the invoking shell's PATH. The live
	// test deliberately uses the caller's already-resolved PATH, matching a real
	// desktop process after its user-home shell probe.
	oldShellPATH := stdioShellPATH
	stdioShellPATH = func(context.Context) string { return os.Getenv("PATH") }
	t.Cleanup(func() { stdioShellPATH = oldShellPATH })

	lifeCtx := t.Context()
	callCtx, callCancel := context.WithTimeout(lifeCtx, 2*time.Minute)
	defer callCancel()

	workspaceRoot := t.TempDir()
	spec := Spec{
		Name:          "chrome-devtools-live",
		Command:       "npx",
		Args:          []string{"-y", "chrome-devtools-mcp@latest", "--isolated=true"},
		Authorized:    true,
		ProcessMode:   MCPProcessHost,
		StateDir:      t.TempDir(),
		WorkspaceRoot: workspaceRoot,
	}
	host := NewHost()
	defer host.Close()
	resolvedNPX, resolvedEnv, resolveErr := resolveStdioExecutable(callCtx, spec, mergeEnv(secrets.ProcessEnv(), spec.Env))
	if resolveErr != nil {
		t.Fatalf("resolve npx: %v", resolveErr)
	}
	resolvedNode, _ := lookPathInEnv("node", resolvedEnv)
	version := exec.Command(resolvedNode, "--version")
	version.Env = resolvedEnv
	versionOut, versionErr := version.CombinedOutput()
	if versionErr != nil {
		t.Fatalf("resolved node %q: %v: %s", resolvedNode, versionErr, strings.TrimSpace(string(versionOut)))
	}
	t.Logf("step 01/12 runtime: npx=%s node=%s version=%s", resolvedNPX, resolvedNode, strings.TrimSpace(string(versionOut)))
	if spec.ResolvedProcessMode() != MCPProcessHost {
		t.Fatalf("step 02/12 process mode = %q, want host", spec.ResolvedProcessMode())
	}
	t.Log("step 02/12 trusted host process mode selected")

	result, err := host.InstallAndConnect(callCtx, spec)
	if err != nil {
		t.Fatalf("InstallAndConnect: state=%s action=%s err=%v", result.State, result.Action, err)
	}
	if result.State != "ready" || result.ToolCount == 0 {
		t.Fatalf("install result = %+v, want ready with tools", result)
	}
	t.Logf("step 03/12 initialize + tools/list ready: tools=%d", result.ToolCount)

	tools, err := host.ToolsFor(callCtx, spec.Name)
	if err != nil {
		t.Fatalf("ToolsFor: %v", err)
	}
	requiredTools := []string{"list_pages", "new_page", "navigate_page", "wait_for", "take_snapshot", "evaluate_script", "list_console_messages", "list_network_requests", "take_screenshot"}
	for _, rawName := range requiredTools {
		if findLiveMCPTool(tools, rawName) == nil {
			t.Fatalf("step 04/12 required tool %q missing from %v", rawName, toolNames(tools))
		}
	}
	t.Logf("step 04/12 catalog contains all %d required browser tools", len(requiredTools))
	listPages := findLiveMCPTool(tools, "list_pages")
	if listPages == nil {
		t.Fatalf("list_pages missing from %v", toolNames(tools))
	}
	out, err := listPages.Execute(callCtx, json.RawMessage(`{}`))
	if err != nil {
		t.Fatalf("list_pages: %v", err)
	}
	if strings.TrimSpace(out) == "" {
		t.Fatal("list_pages returned empty output")
	}
	t.Logf("step 05/12 list_pages=%s", strings.TrimSpace(out))

	newPage := findLiveMCPTool(tools, "new_page")
	if newPage == nil {
		t.Fatalf("new_page missing from %v", toolNames(tools))
	}
	out, err = newPage.Execute(callCtx, json.RawMessage(`{"url":"about:blank"}`))
	if err != nil {
		t.Fatalf("new_page: %v", err)
	}
	if strings.TrimSpace(out) == "" {
		t.Fatal("new_page returned empty output")
	}
	t.Logf("step 06/12 new_page=%s", strings.TrimSpace(out))
	pageID, err := parseSelectedChromePageID(out)
	if err != nil {
		t.Fatalf("step 06/12 selected page ID: %v; output=%q", err, out)
	}

	pageHTML := `data:text/html,<title>Reasonix%20MCP</title><h1>Reasonix%20MCP%20Ready</h1>`
	out = executeLiveChromeTool(t, callCtx, tools, "navigate_page", map[string]any{"pageId": pageID, "type": "url", "url": pageHTML})
	t.Logf("step 07/12 navigate_page=%s", strings.TrimSpace(out))
	out = executeLiveChromeTool(t, callCtx, tools, "wait_for", map[string]any{"pageId": pageID, "text": []string{"Reasonix MCP Ready"}, "timeout": 10_000})
	if !strings.Contains(out, "Reasonix MCP Ready") {
		t.Fatalf("step 08/12 wait_for output = %q", out)
	}
	t.Log("step 08/12 page content became observable")
	out = executeLiveChromeTool(t, callCtx, tools, "take_snapshot", map[string]any{"pageId": pageID})
	if !strings.Contains(out, "Reasonix MCP Ready") {
		t.Fatalf("step 09/12 snapshot output = %q", out)
	}
	t.Log("step 09/12 accessibility snapshot captured")
	out = executeLiveChromeTool(t, callCtx, tools, "evaluate_script", map[string]any{
		"pageId":   pageID,
		"function": `() => { console.log("reasonix-mcp-console"); return document.title; }`,
	})
	if !strings.Contains(out, "Reasonix MCP") {
		t.Fatalf("step 10/12 evaluate_script output = %q", out)
	}
	t.Log("step 10/12 evaluate_script returned the document title")
	consoleOut := executeLiveChromeTool(t, callCtx, tools, "list_console_messages", map[string]any{"pageId": pageID})
	networkOut := executeLiveChromeTool(t, callCtx, tools, "list_network_requests", map[string]any{"pageId": pageID})
	if !strings.Contains(consoleOut, "reasonix-mcp-console") || strings.TrimSpace(networkOut) == "" {
		t.Fatalf("step 11/12 diagnostics console=%q network=%q", consoleOut, networkOut)
	}
	t.Log("step 11/12 console and network diagnostics are readable")
	screenshotPath := filepath.Join(workspaceRoot, "chrome-devtools-live.png")
	_ = executeLiveChromeTool(t, callCtx, tools, "take_screenshot", map[string]any{"pageId": pageID, "filePath": screenshotPath, "format": "png"})
	info, statErr := os.Stat(screenshotPath)
	if statErr != nil || info.Size() == 0 {
		t.Fatalf("step 12/12 screenshot file: info=%v err=%v", info, statErr)
	}
	if host.client(spec.Name) == nil {
		t.Fatal("step 12/12 shared Chrome MCP client disappeared before host close")
	}
	t.Logf("step 12/12 screenshot persisted (%d bytes); shared client healthy before graceful close", info.Size())
}

func parseSelectedChromePageID(output string) (int, error) {
	selected := 0
	for rawLine := range strings.SplitSeq(output, "\n") {
		line := strings.TrimSpace(rawLine)
		if !strings.HasSuffix(line, "[selected]") {
			continue
		}
		rawID, _, ok := strings.Cut(line, ":")
		if !ok {
			return 0, fmt.Errorf("malformed selected page line %q", line)
		}
		pageID, err := strconv.Atoi(strings.TrimSpace(rawID))
		if err != nil || pageID <= 0 {
			return 0, fmt.Errorf("invalid selected page ID in %q", line)
		}
		if selected != 0 {
			return 0, fmt.Errorf("multiple selected pages in output")
		}
		selected = pageID
	}
	if selected == 0 {
		return 0, fmt.Errorf("selected page not found")
	}
	return selected, nil
}

func TestParseSelectedChromePageID(t *testing.T) {
	t.Parallel()
	tests := []struct {
		name    string
		output  string
		want    int
		wantErr bool
	}{
		{name: "new page", output: "## Pages\n1: about:blank\n2: about:blank [selected]", want: 2},
		{name: "URL with colon", output: "## Pages\r\n17: https://example.com:8443/docs [selected]\r\n", want: 17},
		{name: "missing selection", output: "## Pages\n1: about:blank", wantErr: true},
		{name: "invalid ID", output: "## Pages\npage-2: about:blank [selected]", wantErr: true},
		{name: "multiple selections", output: "## Pages\n1: about:blank [selected]\n2: about:blank [selected]", wantErr: true},
	}
	for _, test := range tests {
		t.Run(test.name, func(t *testing.T) {
			t.Parallel()
			got, err := parseSelectedChromePageID(test.output)
			if test.wantErr {
				if err == nil {
					t.Fatalf("parseSelectedChromePageID(%q) = %d, want error", test.output, got)
				}
				return
			}
			if err != nil {
				t.Fatalf("parseSelectedChromePageID(%q): %v", test.output, err)
			}
			if got != test.want {
				t.Fatalf("parseSelectedChromePageID(%q) = %d, want %d", test.output, got, test.want)
			}
		})
	}
}

func executeLiveChromeTool(t *testing.T, ctx context.Context, tools []tool.Tool, rawName string, args any) string {
	t.Helper()
	candidate := findLiveMCPTool(tools, rawName)
	if candidate == nil {
		t.Fatalf("%s missing from %v", rawName, toolNames(tools))
	}
	raw, err := json.Marshal(args)
	if err != nil {
		t.Fatalf("marshal %s args: %v", rawName, err)
	}
	out, err := candidate.Execute(ctx, raw)
	if err != nil {
		t.Fatalf("%s: %v", rawName, err)
	}
	return out
}

func findLiveMCPTool(tools []tool.Tool, rawName string) tool.Tool {
	for _, candidate := range tools {
		meta, ok := candidate.(tool.MCPMetadata)
		if ok && meta.MCPRawToolName() == rawName {
			return candidate
		}
	}
	return nil
}