package controllers

import (
	"math"
	"strconv"
	"strings"

	"github.com/gofiber/fiber/v2"
	"github.com/sujit-baniya/fiber-boilerplate/pkg/models"
)

// AiConfigIndex renderiza la vista del panel de configuraciones de IA.
func AiConfigIndex(c *fiber.Ctx) error {
	data := fiber.Map{
		"user":    c.Locals("user").(map[string]interface{}),
		"modules": c.Locals("userModules"),
	}
	return c.Render("ai_config", data, "layouts/main")
}

// GetAiConfigs devuelve la lista paginada en JSON.
func GetAiConfigs(c *fiber.Ctx) error {
	page, _ := strconv.Atoi(c.Query("page", "1"))
	if page < 1 {
		page = 1
	}
	limit := 20
	offset := (page - 1) * limit
	search := c.Query("search", "")

	items, total, err := models.GetAllAiConfigs(limit, offset, search)
	if err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}

	// Ocultar la API key en el listado (mostrar solo últimos 4 chars)
	type safe struct {
		ID        uint   `json:"ID"`
		Nombre    string `json:"nombre"`
		Provider  string `json:"provider"`
		ApiKeyHint string `json:"api_key_hint"`
		BaseURL   string `json:"base_url"`
		ModelName string `json:"model_name"`
		IsActive  bool   `json:"is_active"`
		Notes     string `json:"notes"`
	}
	safeItems := make([]safe, len(items))
	for i, it := range items {
		hint := "••••"
		if len(it.ApiKey) > 4 {
			hint = "••••" + it.ApiKey[len(it.ApiKey)-4:]
		}
		safeItems[i] = safe{
			ID:         it.ID,
			Nombre:     it.Nombre,
			Provider:   it.Provider,
			ApiKeyHint: hint,
			BaseURL:    it.BaseURL,
			ModelName:  it.ModelName,
			IsActive:   it.IsActive,
			Notes:      it.Notes,
		}
	}

	return c.JSON(fiber.Map{
		"items":      safeItems,
		"total":      total,
		"totalPages": int(math.Ceil(float64(total) / float64(limit))),
		"page":       page,
	})
}

// CreateAiConfigHandler crea una nueva configuración de IA.
func CreateAiConfigHandler(c *fiber.Ctx) error {
	type Req struct {
		Nombre    string `json:"nombre"`
		Provider  string `json:"provider"`
		ApiKey    string `json:"api_key"`
		BaseURL   string `json:"base_url"`
		ModelName string `json:"model_name"`
		IsActive  bool   `json:"is_active"`
		Notes     string `json:"notes"`
	}
	var req Req
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "body inválido"})
	}
	if strings.TrimSpace(req.Nombre) == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "nombre es requerido"})
	}
	if strings.TrimSpace(req.Provider) == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "provider es requerido"})
	}
	if strings.TrimSpace(req.ApiKey) == "" {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "api_key es requerido"})
	}

	item := models.AiConfig{
		Nombre:    strings.TrimSpace(req.Nombre),
		Provider:  strings.ToLower(strings.TrimSpace(req.Provider)),
		ApiKey:    strings.TrimSpace(req.ApiKey),
		BaseURL:   strings.TrimSpace(req.BaseURL),
		ModelName: strings.TrimSpace(req.ModelName),
		IsActive:  req.IsActive,
		Notes:     req.Notes,
	}
	if err := models.CreateAiConfig(&item); err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}
	return c.JSON(fiber.Map{"ok": true, "id": item.ID})
}

// UpdateAiConfigHandler actualiza una configuración de IA existente.
func UpdateAiConfigHandler(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "id inválido"})
	}

	type Req struct {
		Nombre    string `json:"nombre"`
		Provider  string `json:"provider"`
		ApiKey    string `json:"api_key"` // vacío = no cambiar
		BaseURL   string `json:"base_url"`
		ModelName string `json:"model_name"`
		IsActive  bool   `json:"is_active"`
		Notes     string `json:"notes"`
	}
	var req Req
	if err := c.BodyParser(&req); err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "body inválido"})
	}

	updates := map[string]interface{}{
		"nombre":     strings.TrimSpace(req.Nombre),
		"provider":   strings.ToLower(strings.TrimSpace(req.Provider)),
		"base_url":   strings.TrimSpace(req.BaseURL),
		"model_name": strings.TrimSpace(req.ModelName),
		"is_active":  req.IsActive,
		"notes":      req.Notes,
	}
	if strings.TrimSpace(req.ApiKey) != "" {
		updates["api_key"] = strings.TrimSpace(req.ApiKey)
	}

	if err := models.UpdateAiConfig(uint(id), updates); err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}
	return c.JSON(fiber.Map{"ok": true})
}

// DeleteAiConfigHandler elimina una configuración de IA.
func DeleteAiConfigHandler(c *fiber.Ctx) error {
	id, err := strconv.ParseUint(c.Params("id"), 10, 64)
	if err != nil {
		return c.Status(fiber.StatusBadRequest).JSON(fiber.Map{"error": "id inválido"})
	}
	if err := models.DeleteAiConfig(uint(id)); err != nil {
		return c.Status(fiber.StatusInternalServerError).JSON(fiber.Map{"error": err.Error()})
	}
	return c.JSON(fiber.Map{"ok": true})
}