package service

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

	"github.com/stretchr/testify/require"
)

func TestApplyCodexOAuthTransform_ToolContinuationPreservesInput(t *testing.T) {
	// 续链场景：保留 item_reference 与 id，并启用 store。
	setupCodexCache(t)

	reqBody := map[string]any{
		"model": "gpt-5.2",
		"input": []any{
			map[string]any{"type": "item_reference", "id": "ref1", "text": "x"},
			map[string]any{"type": "function_call_output", "call_id": "call_1", "output": "ok", "id": "o1"},
		},
		"tool_choice": "auto",
	}

	applyCodexOAuthTransform(reqBody)

	store, ok := reqBody["store"].(bool)
	require.True(t, ok)
	require.True(t, store)

	input, ok := reqBody["input"].([]any)
	require.True(t, ok)
	require.Len(t, input, 2)

	first := input[0].(map[string]any)
	require.Equal(t, "item_reference", first["type"])
	require.Equal(t, "ref1", first["id"])

	second := input[1].(map[string]any)
	require.Equal(t, "o1", second["id"])
}

func TestApplyCodexOAuthTransform_ToolContinuationForcesStoreTrue(t *testing.T) {
	// 续链场景：显式 store=false 也会被强制为 true。
	setupCodexCache(t)

	reqBody := map[string]any{
		"model": "gpt-5.1",
		"store": false,
		"input": []any{
			map[string]any{"type": "function_call_output", "call_id": "call_1"},
		},
		"tool_choice": "auto",
	}

	applyCodexOAuthTransform(reqBody)

	store, ok := reqBody["store"].(bool)
	require.True(t, ok)
	require.True(t, store)
}

func TestApplyCodexOAuthTransform_NonContinuationForcesStoreFalseAndStripsIDs(t *testing.T) {
	// 非续链场景：强制 store=false，并移除 input 中的 id。
	setupCodexCache(t)

	reqBody := map[string]any{
		"model": "gpt-5.1",
		"store": true,
		"input": []any{
			map[string]any{"type": "text", "id": "t1", "text": "hi"},
		},
	}

	applyCodexOAuthTransform(reqBody)

	store, ok := reqBody["store"].(bool)
	require.True(t, ok)
	require.False(t, store)

	input, ok := reqBody["input"].([]any)
	require.True(t, ok)
	require.Len(t, input, 1)
	item := input[0].(map[string]any)
	_, hasID := item["id"]
	require.False(t, hasID)
}

func TestFilterCodexInput_RemovesItemReferenceWhenNotPreserved(t *testing.T) {
	input := []any{
		map[string]any{"type": "item_reference", "id": "ref1"},
		map[string]any{"type": "text", "id": "t1", "text": "hi"},
	}

	filtered := filterCodexInput(input, false)
	require.Len(t, filtered, 1)
	item := filtered[0].(map[string]any)
	require.Equal(t, "text", item["type"])
	_, hasID := item["id"]
	require.False(t, hasID)
}

func TestApplyCodexOAuthTransform_EmptyInput(t *testing.T) {
	// 空 input 应保持为空且不触发异常。
	setupCodexCache(t)

	reqBody := map[string]any{
		"model": "gpt-5.1",
		"input": []any{},
	}

	applyCodexOAuthTransform(reqBody)

	input, ok := reqBody["input"].([]any)
	require.True(t, ok)
	require.Len(t, input, 0)
}

func setupCodexCache(t *testing.T) {
	t.Helper()

	// 使用临时 HOME 避免触发网络拉取 header。
	tempDir := t.TempDir()
	t.Setenv("HOME", tempDir)

	cacheDir := filepath.Join(tempDir, ".opencode", "cache")
	require.NoError(t, os.MkdirAll(cacheDir, 0o755))
	require.NoError(t, os.WriteFile(filepath.Join(cacheDir, "opencode-codex-header.txt"), []byte("header"), 0o644))

	meta := map[string]any{
		"etag":        "",
		"lastFetch":   time.Now().UTC().Format(time.RFC3339),
		"lastChecked": time.Now().UnixMilli(),
	}
	data, err := json.Marshal(meta)
	require.NoError(t, err)
	require.NoError(t, os.WriteFile(filepath.Join(cacheDir, "opencode-codex-header-meta.json"), data, 0o644))
}