package v1

import (
	"errors"
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/llm"
	"github.com/gochat/gochat/internal/service"
	"github.com/gochat/gochat/pkg/response"
)

// CopilotConfigHandler exposes typed platform and account configuration APIs.
// Platform mutations are registered behind middleware.SuperAdmin; account
// configuration remains administrator scoped.
type CopilotConfigHandler struct {
	platform *service.CopilotConfigService
	account  *service.CaptainPreferenceService
}

func NewCopilotConfigHandler(platform *service.CopilotConfigService, account *service.CaptainPreferenceService) *CopilotConfigHandler {
	return &CopilotConfigHandler{platform: platform, account: account}
}

func (h *CopilotConfigHandler) PlatformGet(c *gin.Context) {
	payload, err := h.platform.Get(c.Request.Context())
	if err != nil {
		handleServiceError(c, err)
		return
	}
	c.JSON(http.StatusOK, payload)
}

func (h *CopilotConfigHandler) PlatformUpdate(c *gin.Context) {
	var input service.CopilotProviderConfigInput
	if err := c.ShouldBindJSON(&input); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	payload, err := h.platform.Update(c.Request.Context(), input)
	if err != nil {
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, payload)
}

func (h *CopilotConfigHandler) PlatformTest(c *gin.Context) {
	var input service.CopilotProviderConfigInput
	if err := c.ShouldBindJSON(&input); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	payload, err := h.platform.Test(c.Request.Context(), input)
	if err != nil {
		status := http.StatusUnprocessableEntity
		if errors.Is(err, llm.ErrProviderNotConfigured) {
			status = http.StatusConflict
		}
		c.JSON(status, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, payload)
}

func (h *CopilotConfigHandler) AccountGet(c *gin.Context) {
	if !captainPreferencesCanUpdate(c) {
		response.AbortWithStatusError(c, http.StatusForbidden, response.ErrForbidden, "administrator role required")
		return
	}
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	payload, err := h.account.GetConfig(c.Request.Context(), accountID)
	if err != nil {
		handleServiceError(c, err)
		return
	}
	c.JSON(http.StatusOK, payload)
}

func (h *CopilotConfigHandler) AccountUpdate(c *gin.Context) {
	if !captainPreferencesCanUpdate(c) {
		response.AbortWithStatusError(c, http.StatusForbidden, response.ErrForbidden, "administrator role required")
		return
	}
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	var input service.UpdateCaptainConfigRequest
	if err := c.ShouldBindJSON(&input); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}
	payload, err := h.account.UpdateConfig(c.Request.Context(), accountID, &input)
	if err != nil {
		c.JSON(http.StatusUnprocessableEntity, gin.H{"error": err.Error()})
		return
	}
	c.JSON(http.StatusOK, payload)
}