// Package client provides the implementation for interacting with the WeKnora API
// The Model related interfaces are used to manage models for different tasks
// Models can be created, retrieved, updated, deleted, and queried
package client

import (
	"context"
	"fmt"
	"net/http"
)

// ModelType model type
type ModelType string

// ModelSource model source
type ModelSource string

// ModelParameters model parameters
type ModelParameters map[string]interface{}

// Model model information
type Model struct {
	ID          string          `json:"id"`
	TenantID    uint            `json:"tenant_id"`
	Name        string          `json:"name"`
	Type        ModelType       `json:"type"`
	Source      ModelSource     `json:"source"`
	Description string          `json:"description"`
	Parameters  ModelParameters `json:"parameters"`
	IsDefault   bool            `json:"is_default"`
	CreatedAt   string          `json:"created_at"`
	UpdatedAt   string          `json:"updated_at"`
}

// CreateModelRequest model creation request
type CreateModelRequest struct {
	Name        string          `json:"name"`
	Type        ModelType       `json:"type"`
	Source      ModelSource     `json:"source"`
	Description string          `json:"description"`
	Parameters  ModelParameters `json:"parameters"`
	IsDefault   bool            `json:"is_default"`
}

// UpdateModelRequest model update request
type UpdateModelRequest struct {
	Name        string          `json:"name"`
	Description string          `json:"description"`
	Parameters  ModelParameters `json:"parameters"`
	IsDefault   bool            `json:"is_default"`
}

// ModelResponse model response
type ModelResponse struct {
	Success bool  `json:"success"`
	Data    Model `json:"data"`
}

// ModelListResponse model list response
type ModelListResponse struct {
	Success bool    `json:"success"`
	Data    []Model `json:"data"`
}

// Model type constants
const (
	ModelTypeEmbedding ModelType = "embedding"
	ModelTypeChat      ModelType = "chat"
	ModelTypeRerank    ModelType = "rerank"
	ModelTypeSummary   ModelType = "summary"
)

// Model source constants
const (
	ModelSourceInternal ModelSource = "internal"
	ModelSourceExternal ModelSource = "external"
)

// CreateModel creates a model
func (c *Client) CreateModel(ctx context.Context, request *CreateModelRequest) (*Model, error) {
	resp, err := c.doRequest(ctx, http.MethodPost, "/api/v1/models", request, nil)
	if err != nil {
		return nil, err
	}

	var response ModelResponse
	if err := parseResponse(resp, &response); err != nil {
		return nil, err
	}

	return &response.Data, nil
}

// GetModel gets a model
func (c *Client) GetModel(ctx context.Context, modelID string) (*Model, error) {
	path := fmt.Sprintf("/api/v1/models/%s", modelID)
	resp, err := c.doRequest(ctx, http.MethodGet, path, nil, nil)
	if err != nil {
		return nil, err
	}

	var response ModelResponse
	if err := parseResponse(resp, &response); err != nil {
		return nil, err
	}

	return &response.Data, nil
}

// ListModels lists all models
func (c *Client) ListModels(ctx context.Context) ([]Model, error) {
	resp, err := c.doRequest(ctx, http.MethodGet, "/api/v1/models", nil, nil)
	if err != nil {
		return nil, err
	}

	var response ModelListResponse
	if err := parseResponse(resp, &response); err != nil {
		return nil, err
	}

	return response.Data, nil
}

// UpdateModel updates a model
func (c *Client) UpdateModel(ctx context.Context, modelID string, request *UpdateModelRequest) (*Model, error) {
	path := fmt.Sprintf("/api/v1/models/%s", modelID)
	resp, err := c.doRequest(ctx, http.MethodPut, path, request, nil)
	if err != nil {
		return nil, err
	}

	var response ModelResponse
	if err := parseResponse(resp, &response); err != nil {
		return nil, err
	}

	return &response.Data, nil
}

// DeleteModel deletes a model
func (c *Client) DeleteModel(ctx context.Context, modelID string) error {
	path := fmt.Sprintf("/api/v1/models/%s", modelID)
	resp, err := c.doRequest(ctx, http.MethodDelete, path, nil, nil)
	if err != nil {
		return err
	}

	var response struct {
		Success bool   `json:"success"`
		Message string `json:"message,omitempty"`
	}

	return parseResponse(resp, &response)
}