package api

import (
	"database/sql/driver"
	"encoding/json"
	"fmt"
)

type ToolSpec struct {
	Name        string
	Description string
	Parameters  []ToolParameter
	Impl        func(*ToolSpec, map[string]interface{}) (string, error)
}

type ToolParameter struct {
	Name        string   `json:"name"`
	Type        string   `json:"type"` // "string", "integer", "boolean"
	Required    bool     `json:"required"`
	Description string   `json:"description"`
	Enum        []string `json:"enum,omitempty"`
}

type ToolCall struct {
	ID         string                 `json:"id" yaml:"-"`
	Name       string                 `json:"name" yaml:"tool"`
	Parameters map[string]interface{} `json:"parameters" yaml:"parameters"`
}

type ToolResult struct {
	ToolCallID string `json:"toolCallID" yaml:"-"`
	ToolName   string `json:"toolName,omitempty" yaml:"tool"`
	Result     string `json:"result,omitempty" yaml:"result"`
}

type ToolCalls []ToolCall

func (tc *ToolCalls) Scan(value any) (err error) {
	s := value.(string)
	if value == nil || s == "" {
		*tc = nil
		return
	}
	err = json.Unmarshal([]byte(s), tc)
	return
}

func (tc ToolCalls) Value() (driver.Value, error) {
	if len(tc) == 0 {
		return "", nil
	}
	jsonBytes, err := json.Marshal(tc)
	if err != nil {
		return "", fmt.Errorf("Could not marshal ToolCalls to JSON: %v\n", err)
	}
	return string(jsonBytes), nil
}

type ToolResults []ToolResult

func (tr *ToolResults) Scan(value any) (err error) {
	s := value.(string)
	if value == nil || s == "" {
		*tr = nil
		return
	}
	err = json.Unmarshal([]byte(s), tr)
	return
}

func (tr ToolResults) Value() (driver.Value, error) {
	if len(tr) == 0 {
		return "", nil
	}
	jsonBytes, err := json.Marshal([]ToolResult(tr))
	if err != nil {
		return "", fmt.Errorf("Could not marshal ToolResults to JSON: %v\n", err)
	}
	return string(jsonBytes), nil
}

type CallResult struct {
	Message string `json:"message"`
	Result  any    `json:"result,omitempty"`
}

func (r CallResult) ToJson() (string, error) {
	if r.Message == "" {
		// When message not supplied, assume success
		r.Message = "success"
	}

	jsonBytes, err := json.Marshal(r)
	if err != nil {
		return "", fmt.Errorf("Could not marshal CallResult to JSON: %v\n", err)
	}
	return string(jsonBytes), nil
}