package backup

import (
	"fmt"
	"net/http"

	"github.com/atlasos/calypso/internal/common/logger"
	"github.com/gin-gonic/gin"
)

// Handler handles backup-related API requests
type Handler struct {
	service *Service
	logger  *logger.Logger
}

// NewHandler creates a new backup handler
func NewHandler(service *Service, log *logger.Logger) *Handler {
	return &Handler{
		service: service,
		logger:  log,
	}
}

// ListJobs lists backup jobs with optional filters
func (h *Handler) ListJobs(c *gin.Context) {
	opts := ListJobsOptions{
		Status:     c.Query("status"),
		JobType:    c.Query("job_type"),
		ClientName: c.Query("client_name"),
		JobName:    c.Query("job_name"),
	}

	// Parse pagination
	var limit, offset int
	if limitStr := c.Query("limit"); limitStr != "" {
		if _, err := fmt.Sscanf(limitStr, "%d", &limit); err == nil {
			opts.Limit = limit
		}
	}
	if offsetStr := c.Query("offset"); offsetStr != "" {
		if _, err := fmt.Sscanf(offsetStr, "%d", &offset); err == nil {
			opts.Offset = offset
		}
	}

	jobs, totalCount, err := h.service.ListJobs(c.Request.Context(), opts)
	if err != nil {
		h.logger.Error("Failed to list jobs", "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to list jobs"})
		return
	}

	if jobs == nil {
		jobs = []Job{}
	}

	c.JSON(http.StatusOK, gin.H{
		"jobs":   jobs,
		"total":  totalCount,
		"limit":  opts.Limit,
		"offset": opts.Offset,
	})
}

// GetJob retrieves a job by ID
func (h *Handler) GetJob(c *gin.Context) {
	id := c.Param("id")

	job, err := h.service.GetJob(c.Request.Context(), id)
	if err != nil {
		if err.Error() == "job not found" {
			c.JSON(http.StatusNotFound, gin.H{"error": "job not found"})
			return
		}
		h.logger.Error("Failed to get job", "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to get job"})
		return
	}

	c.JSON(http.StatusOK, job)
}

// CreateJob creates a new backup job
func (h *Handler) CreateJob(c *gin.Context) {
	var req CreateJobRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// Validate job type
	validJobTypes := map[string]bool{
		"Backup": true, "Restore": true, "Verify": true, "Copy": true, "Migrate": true,
	}
	if !validJobTypes[req.JobType] {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid job_type"})
		return
	}

	// Validate job level
	validJobLevels := map[string]bool{
		"Full": true, "Incremental": true, "Differential": true, "Since": true,
	}
	if !validJobLevels[req.JobLevel] {
		c.JSON(http.StatusBadRequest, gin.H{"error": "invalid job_level"})
		return
	}

	job, err := h.service.CreateJob(c.Request.Context(), req)
	if err != nil {
		h.logger.Error("Failed to create job", "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{"error": "failed to create job"})
		return
	}

	c.JSON(http.StatusCreated, job)
}

// ExecuteBconsoleCommand executes a bconsole command
func (h *Handler) ExecuteBconsoleCommand(c *gin.Context) {
	var req struct {
		Command string `json:"command" binding:"required"`
	}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "command is required"})
		return
	}

	output, err := h.service.ExecuteBconsoleCommand(c.Request.Context(), req.Command)
	if err != nil {
		h.logger.Error("Failed to execute bconsole command", "error", err, "command", req.Command)
		c.JSON(http.StatusInternalServerError, gin.H{
			"error":   "failed to execute command",
			"output":  output,
			"details": err.Error(),
		})
		return
	}

	c.JSON(http.StatusOK, gin.H{
		"output": output,
	})
}

// ListClients lists all backup clients with optional filters
func (h *Handler) ListClients(c *gin.Context) {
	opts := ListClientsOptions{}

	// Parse enabled filter
	if enabledStr := c.Query("enabled"); enabledStr != "" {
		enabled := enabledStr == "true"
		opts.Enabled = &enabled
	}

	// Parse search query
	opts.Search = c.Query("search")

	clients, err := h.service.ListClients(c.Request.Context(), opts)
	if err != nil {
		h.logger.Error("Failed to list clients", "error", err)
		c.JSON(http.StatusInternalServerError, gin.H{
			"error":   "failed to list clients",
			"details": err.Error(),
		})
		return
	}

	if clients == nil {
		clients = []Client{}
	}

	c.JSON(http.StatusOK, gin.H{
		"clients": clients,
		"total":   len(clients),
	})
}