package v1

import (
	"net/http"

	"github.com/gin-gonic/gin"
	"github.com/gochat/gochat/internal/model"
	"github.com/gochat/gochat/internal/service"
	applogger "github.com/gochat/gochat/pkg/logger"
	"github.com/gochat/gochat/pkg/response"
)

// CaptainScenarioHandler handles CaptainScenario REST API endpoints.
// Reference: Chatwoot enterprise/app/controllers/api/v1/captain/scenarios_controller.rb
type CaptainScenarioHandler struct {
	svc *service.CaptainScenarioService
}

// NewCaptainScenarioHandler creates a new CaptainScenarioHandler.
func NewCaptainScenarioHandler(svc *service.CaptainScenarioService) *CaptainScenarioHandler {
	return &CaptainScenarioHandler{svc: svc}
}

// Create creates a new scenario under an assistant.
// POST /api/v1/accounts/:account_id/captain_assistants/:assistant_id/scenarios
func (h *CaptainScenarioHandler) Create(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	assistantID, err := parseUintParam(c, "assistant_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid assistant_id")
		return
	}

	var req service.CreateScenarioRequest
	if err := bindNestedJSONPayload(c, "scenario", &req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	scenario, err := h.svc.Create(c.Request.Context(), accountID, assistantID, &req)
	if err != nil {
		applogger.L().Errorf("Create captain scenario: %v", err)
		response.AbortWithStatusError(c, captainAssistantErrorStatus(err), response.ErrInternal, "failed to create scenario")
		return
	}

	c.JSON(http.StatusOK, captainScenarioPayload(scenario))
}

// Get retrieves a scenario by ID.
// GET /api/v1/accounts/:account_id/captain_assistants/:assistant_id/scenarios/:id
func (h *CaptainScenarioHandler) Get(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	assistantID, err := parseUintParam(c, "assistant_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid assistant_id")
		return
	}
	id, err := parseUintAnyParam(c, "scenario_id", "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	scenario, err := h.svc.Get(c.Request.Context(), accountID, assistantID, id)
	if err != nil {
		applogger.L().Errorf("Get captain scenario: %v", err)
		response.AbortWithStatusError(c, http.StatusNotFound, response.ErrNotFound, "scenario not found")
		return
	}

	c.JSON(http.StatusOK, captainScenarioPayload(scenario))
}

// Update updates an existing scenario.
// PUT /api/v1/accounts/:account_id/captain_assistants/:assistant_id/scenarios/:id
func (h *CaptainScenarioHandler) Update(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	assistantID, err := parseUintParam(c, "assistant_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid assistant_id")
		return
	}
	id, err := parseUintAnyParam(c, "scenario_id", "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	var req service.UpdateScenarioRequest
	if err := bindNestedJSONPayload(c, "scenario", &req); err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrValidation, err.Error())
		return
	}

	scenario, err := h.svc.UpdateScoped(c.Request.Context(), accountID, assistantID, id, &req)
	if err != nil {
		applogger.L().Errorf("Update captain scenario: %v", err)
		response.AbortWithStatusError(c, captainAssistantErrorStatus(err), response.ErrInternal, "failed to update scenario")
		return
	}

	c.JSON(http.StatusOK, captainScenarioPayload(scenario))
}

// Delete deletes a scenario.
// DELETE /api/v1/accounts/:account_id/captain_assistants/:assistant_id/scenarios/:id
func (h *CaptainScenarioHandler) Delete(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	assistantID, err := parseUintParam(c, "assistant_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid assistant_id")
		return
	}
	id, err := parseUintAnyParam(c, "scenario_id", "id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid id")
		return
	}

	if err := h.svc.DeleteScoped(c.Request.Context(), accountID, assistantID, id); err != nil {
		applogger.L().Errorf("Delete captain scenario: %v", err)
		response.AbortWithStatusError(c, captainAssistantErrorStatus(err), response.ErrInternal, "failed to delete scenario")
		return
	}

	response.NoContent(c)
}

// List retrieves scenarios for an assistant.
// GET /api/v1/accounts/:account_id/captain_assistants/:assistant_id/scenarios
func (h *CaptainScenarioHandler) List(c *gin.Context) {
	accountID := parseAccountIDParam(c)
	if accountID == 0 {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid account_id")
		return
	}
	assistantID, err := parseUintParam(c, "assistant_id")
	if err != nil {
		response.AbortWithStatusError(c, http.StatusBadRequest, response.ErrBadRequest, "invalid assistant_id")
		return
	}

	scenarios, count, err := h.svc.ListByAccountAssistant(c.Request.Context(), accountID, assistantID)
	if err != nil {
		applogger.L().Errorf("List captain scenarios: %v", err)
		response.AbortWithStatusError(c, captainAssistantErrorStatus(err), response.ErrInternal, "failed to list scenarios")
		return
	}

	payload := make([]gin.H, 0, len(scenarios))
	for i := range scenarios {
		payload = append(payload, captainScenarioPayload(&scenarios[i]))
	}
	c.JSON(http.StatusOK, gin.H{"payload": payload, "meta": gin.H{"total_count": count, "page": 1}})
}

func captainScenarioPayload(scenario *model.CaptainScenario) gin.H {
	payload := gin.H{
		"id":           scenario.ID,
		"title":        scenario.Title,
		"description":  scenario.Description,
		"instruction":  scenario.Instruction,
		"tools":        rawJSONValue(scenario.Tools),
		"enabled":      scenario.Enabled,
		"assistant_id": scenario.AssistantID,
		"account_id":   scenario.AccountID,
		"created_at":   scenario.CreatedAt,
		"updated_at":   scenario.UpdatedAt,
	}
	if scenario.Assistant.ID != 0 {
		payload["assistant"] = gin.H{"id": scenario.Assistant.ID, "name": scenario.Assistant.Name}
	}
	return payload
}