package services

import (
	"github.com/libaxuan/cursor2api-go/models"
	"github.com/libaxuan/cursor2api-go/utils"
	"encoding/json"
	"strings"
)

// BuildResponseOutputFromMessage converts a chat completion message into response output items.
func BuildResponseOutputFromMessage(message models.Message, adapter *ResponseToolAdapter) ([]interface{}, string) {
	output := make([]interface{}, 0, 1+len(message.ToolCalls))
	var outputText string

	text := message.GetStringContent()
	if text != "" {
		msgItem := buildResponseMessageItem(text)
		output = append(output, msgItem)
		outputText = text
	}

	for _, toolCall := range message.ToolCalls {
		output = append(output, buildResponseToolCallItem(toolCall, adapter))
	}

	return output, outputText
}

func buildResponseMessageItem(text string) models.ResponseOutputMessage {
	return models.ResponseOutputMessage{
		ID:     utils.GenerateResponseItemID("msg_"),
		Type:   "message",
		Status: "completed",
		Role:   "assistant",
		Content: []models.ResponseOutputTextContent{
			{
				Type:        "output_text",
				Text:        text,
				Annotations: []interface{}{},
			},
		},
	}
}

func buildResponseToolCallItem(toolCall models.ToolCall, adapter *ResponseToolAdapter) interface{} {
	name := strings.TrimSpace(toolCall.Function.Name)
	if name == "" {
		name = "tool"
	}

	if adapter == nil || adapter.ToolTypesByName == nil {
		return buildFunctionCallItem(toolCall, name)
	}

	switch adapterType := adapter.ToolTypesByName[name]; adapterType {
	case "apply_patch":
		return buildApplyPatchCallItem(toolCall)
	case "shell":
		return buildShellCallItem(toolCall, adapter.ShellEnvironment)
	case "local_shell":
		return buildLocalShellCallItem(toolCall)
	default:
		return buildFunctionCallItem(toolCall, name)
	}
}

func buildFunctionCallItem(toolCall models.ToolCall, name string) models.ResponseFunctionCall {
	args := strings.TrimSpace(toolCall.Function.Arguments)
	if args == "" {
		args = "{}"
	}
	callID := toolCall.ID
	if callID == "" {
		callID = utils.GenerateResponseItemID("call_")
	}
	return models.ResponseFunctionCall{
		ID:        utils.GenerateResponseItemID("fc_"),
		Type:      "function_call",
		Status:    "completed",
		CallID:    callID,
		Name:      name,
		Arguments: args,
	}
}

func buildApplyPatchCallItem(toolCall models.ToolCall) models.ResponseApplyPatchCall {
	op := parseOperation(toolCall.Function.Arguments)
	callID := toolCall.ID
	if callID == "" {
		callID = utils.GenerateResponseItemID("call_")
	}
	return models.ResponseApplyPatchCall{
		ID:        utils.GenerateResponseItemID("apc_"),
		Type:      "apply_patch_call",
		Status:    "completed",
		CallID:    callID,
		Operation: op,
	}
}

func buildShellCallItem(toolCall models.ToolCall, environment interface{}) models.ResponseShellCall {
	action := parseShellAction(toolCall.Function.Arguments)
	callID := toolCall.ID
	if callID == "" {
		callID = utils.GenerateResponseItemID("call_")
	}
	return models.ResponseShellCall{
		ID:          utils.GenerateResponseItemID("sc_"),
		Type:        "shell_call",
		Status:      "completed",
		CallID:      callID,
		Action:      action,
		Environment: environment,
	}
}

func buildLocalShellCallItem(toolCall models.ToolCall) models.ResponseLocalShellCall {
	action := parseLocalShellAction(toolCall.Function.Arguments)
	callID := toolCall.ID
	if callID == "" {
		callID = utils.GenerateResponseItemID("call_")
	}
	return models.ResponseLocalShellCall{
		ID:     utils.GenerateResponseItemID("lsc_"),
		Type:   "local_shell_call",
		Status: "completed",
		CallID: callID,
		Action: action,
	}
}

func parseOperation(arguments string) map[string]interface{} {
	args := strings.TrimSpace(arguments)
	if args == "" {
		return map[string]interface{}{}
	}

	var payload map[string]interface{}
	if err := json.Unmarshal([]byte(args), &payload); err == nil {
		if op, ok := payload["operation"].(map[string]interface{}); ok {
			return op
		}
		if hasKeys(payload, "type", "path") {
			return payload
		}
		return payload
	}

	return map[string]interface{}{
		"diff": args,
	}
}

func parseShellAction(arguments string) map[string]interface{} {
	args := strings.TrimSpace(arguments)
	if args == "" {
		return map[string]interface{}{"commands": []string{}}
	}

	var payload map[string]interface{}
	if err := json.Unmarshal([]byte(args), &payload); err == nil {
		if action, ok := payload["action"].(map[string]interface{}); ok {
			return normalizeShellAction(action)
		}
		return normalizeShellAction(payload)
	}

	return map[string]interface{}{
		"commands": []string{args},
	}
}

func parseLocalShellAction(arguments string) map[string]interface{} {
	args := strings.TrimSpace(arguments)
	if args == "" {
		return map[string]interface{}{"command": ""}
	}

	var payload map[string]interface{}
	if err := json.Unmarshal([]byte(args), &payload); err == nil {
		if action, ok := payload["action"].(map[string]interface{}); ok {
			return normalizeLocalShellAction(action)
		}
		return normalizeLocalShellAction(payload)
	}

	return map[string]interface{}{
		"command": args,
	}
}

func normalizeShellAction(payload map[string]interface{}) map[string]interface{} {
	action := map[string]interface{}{}

	if cmds, ok := payload["commands"]; ok {
		action["commands"] = normalizeStringSlice(cmds)
	} else if cmd, ok := payload["command"]; ok {
		action["commands"] = normalizeStringSlice(cmd)
	}

	if timeout, ok := payload["timeout_ms"]; ok {
		action["timeout_ms"] = timeout
	}
	if maxOut, ok := payload["max_output_length"]; ok {
		action["max_output_length"] = maxOut
	}

	if _, exists := action["commands"]; !exists {
		action["commands"] = []string{}
	}

	return action
}

func normalizeLocalShellAction(payload map[string]interface{}) map[string]interface{} {
	action := map[string]interface{}{}

	if cmd, ok := payload["command"]; ok {
		action["command"] = cmd
	} else if cmds, ok := payload["commands"]; ok {
		action["command"] = cmds
	}

	if timeout, ok := payload["timeout_ms"]; ok {
		action["timeout_ms"] = timeout
	}
	if wd, ok := payload["working_directory"]; ok {
		action["working_directory"] = wd
	}
	if env, ok := payload["env"]; ok {
		action["env"] = env
	}
	if maxOut, ok := payload["max_output_length"]; ok {
		action["max_output_length"] = maxOut
	}

	if _, exists := action["command"]; !exists {
		action["command"] = ""
	}

	return action
}

func normalizeStringSlice(value interface{}) []string {
	switch v := value.(type) {
	case []interface{}:
		result := make([]string, 0, len(v))
		for _, item := range v {
			if text, ok := item.(string); ok {
				result = append(result, text)
			}
		}
		return result
	case []string:
		return v
	case string:
		return []string{v}
	default:
		return []string{}
	}
}

func hasKeys(payload map[string]interface{}, keys ...string) bool {
	for _, key := range keys {
		if _, ok := payload[key]; !ok {
			return false
		}
	}
	return true
}