// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
package cli

import (
	"bytes"
	"encoding/json"
	"os"
	"path/filepath"
	"testing"

	"github.com/spf13/cobra"
)

func TestCrossPlatformCoverageCanonicalCommandsAndFlags(t *testing.T) {
	mcp := NewMCPCommand()
	mcp.SetOut(&bytes.Buffer{})
	if err := mcp.Execute(); err != nil {
		t.Fatal(err)
	}
}

func TestCrossPlatformCoveragePriorityEdges(t *testing.T) {
	cmd := &cobra.Command{Use: "priority"}
	SetOverridePriority(cmd, 42)
	if got := OverridePriority(cmd); got != 42 {
		t.Fatalf("priority = %d", got)
	}
}

func TestCrossPlatformCoverageSchemaValidationCompleteMatrix(t *testing.T) {
	if err := ValidateInputSchema(nil, nil); err != nil {
		t.Fatal(err)
	}
	if err := ValidateInputSchema(nil, map[string]any{"type": "object", "required": []string{"x"}}); err == nil {
		t.Fatal("missing required property accepted")
	}
	schema := map[string]any{
		"type":     "object",
		"required": []any{"known", 1, ""},
		"properties": map[string]any{
			"known": map[string]any{"type": "array", "items": map[string]any{"type": "integer"}},
			"skip":  "invalid",
		},
		"additionalProperties": false,
	}
	if err := ValidateInputSchema(map[string]any{"known": []any{1, 2.5}}, schema); err == nil {
		t.Fatal("invalid array item accepted")
	}
	if err := ValidateInputSchema(map[string]any{"known": []any{1}, "extra": true}, schema); err == nil {
		t.Fatal("unknown property accepted")
	}
	additional := map[string]any{
		"type":                 "object",
		"properties":           map[string]any{"known": map[string]any{"type": "string"}},
		"additionalProperties": map[string]any{"type": "number"},
	}
	if err := ValidateInputSchema(map[string]any{"known": "x", "extra": "bad"}, additional); err == nil {
		t.Fatal("invalid additional property accepted")
	}
	if err := validateSchemaValue("$", "x", nil); err != nil {
		t.Fatal(err)
	}
	if err := validateSchemaValue("$", "x", map[string]any{"enum": []string{"y"}}); err == nil {
		t.Fatal("invalid enum accepted")
	}

	typeCases := []struct {
		value any
		typ   string
		want  bool
	}{
		{map[string]any{}, "object", true}, {[]any{}, "array", true}, {"x", "string", true},
		{true, "boolean", true}, {1.5, "number", true}, {"x", "number", false},
		{2, "integer", true}, {2.5, "integer", false}, {"x", "integer", false},
		{nil, "null", true}, {"x", "future", true},
	}
	for _, tc := range typeCases {
		if got := matchesType(tc.value, tc.typ); got != tc.want {
			t.Fatalf("matchesType(%#v,%q) = %v, want %v", tc.value, tc.typ, got, tc.want)
		}
	}
	for _, typed := range []any{"", "string", []string{"", "number"}, []any{"", 1, "boolean"}, 1} {
		_ = schemaTypes(map[string]any{"type": typed})
	}
	if hasType([]string{"a", "b"}, "c") || !hasType([]string{"a", "b"}, "b") {
		t.Fatal("hasType failed")
	}
	if matchesAnyType("x", []string{"number", "boolean"}) || !matchesAnyType("x", []string{"number", "string"}) {
		t.Fatal("matchesAnyType failed")
	}
	for _, enum := range []any{[]any{"x"}, []string{"x"}, "invalid"} {
		_ = schemaEnum(map[string]any{"enum": enum})
	}
	if valuesEqual("1", 1) || !valuesEqual(json.Number("1"), float64(1)) {
		t.Fatal("enum value equality failed")
	}
	for _, number := range []any{float64(1), float32(1), int(1), int8(1), int16(1), int32(1), int64(1), uint(1), uint8(1), uint16(1), uint32(1), uint64(1), json.Number("1"), json.Number("x"), "x"} {
		_, _ = numberValue(number)
	}
	if got := schemaProperties(map[string]any{}); len(got) != 0 {
		t.Fatal("missing properties were nonempty")
	}
	for _, required := range []any{[]string{"x"}, []any{"x", 1, ""}, "invalid"} {
		_ = schemaRequired(map[string]any{"required": required})
	}
	for _, additional := range []map[string]any{{}, {"additionalProperties": true}, {"additionalProperties": false}, {"additionalProperties": map[string]any{"type": "string"}}, {"additionalProperties": "invalid"}} {
		_, _, _ = additionalProperties(additional)
	}
}

func TestCrossPlatformCoverageStdinCompleteMatrix(t *testing.T) {
	original := os.Stdin
	// Restore/close before t.TempDir cleanup. defer runs on return and on
	// t.Fatal (Goexit); open Windows handles otherwise block RemoveAll.
	defer func() {
		if current := os.Stdin; current != nil && current != original {
			os.Stdin = original
			_ = current.Close()
			return
		}
		os.Stdin = original
	}()
	setStdin := func(f *os.File) {
		if prev := os.Stdin; prev != nil && prev != original {
			_ = prev.Close()
		}
		os.Stdin = f
	}

	closed, err := os.CreateTemp(t.TempDir(), "closed")
	if err != nil {
		t.Fatal(err)
	}
	_ = closed.Close()
	setStdin(closed)
	if StdinIsPipe() {
		t.Fatal("closed stdin reported as pipe")
	}
	if _, err := ReadStdin(); err == nil {
		t.Fatal("closed stdin read succeeded")
	}

	stdin, err := os.CreateTemp(t.TempDir(), "stdin")
	if err != nil {
		t.Fatal(err)
	}
	if _, err := stdin.WriteString("piped"); err != nil {
		t.Fatal(err)
	}
	_, _ = stdin.Seek(0, 0)
	setStdin(stdin)
	if !StdinIsPipe() {
		t.Fatal("regular file stdin did not report pipe")
	}
	if got, err := ReadStdinIfPiped(); err != nil || got != "piped" {
		t.Fatalf("piped stdin = %q, %v", got, err)
	}
	_, _ = stdin.Seek(0, 0)
	guard := NewStdinGuard()
	if got, err := ResolveInputSource("@-", "text", guard); err != nil || got != "piped" {
		t.Fatalf("resolved stdin = %q, %v", got, err)
	}
	if _, err := ResolveInputSource("@-", "other", guard); err == nil {
		t.Fatal("stdin reused")
	}
	if _, err := ResolveInputSource("@-", "text", nil); err == nil {
		t.Fatal("nil stdin guard accepted")
	}

	dir := t.TempDir()
	if _, err := readFileBounded(dir); err == nil {
		t.Fatal("directory read as file")
	}
	large := filepath.Join(t.TempDir(), "large")
	if err := os.WriteFile(large, bytes.Repeat([]byte("x"), maxStdinSize+1), 0o600); err != nil {
		t.Fatal(err)
	}
	if _, err := readFileBounded(large); err == nil {
		t.Fatal("oversized file accepted")
	}
	largeStdin, err := os.Open(large)
	if err != nil {
		t.Fatal(err)
	}
	setStdin(largeStdin)
	if _, err := readStdinBounded(); err == nil {
		t.Fatal("oversized stdin accepted")
	}
	for _, value := range []string{"@A", "@a", "@1", "@.", "@/", "@~", "@_", "@-", "@!", "@所有人", "plain"} {
		_ = looksLikeFilePath(value)
	}
	if _, _, err := ReadFileArg("@"); err == nil {
		t.Fatal("bare file argument accepted")
	}
	if _, err := ResolveInputSource("@", "text", guard); err == nil {
		t.Fatal("bare input source accepted")
	}
}