// Package api provides HTTP handlers for the API Gateway
package api

import (
	"net/http"
	"time"

	"github.com/gin-gonic/gin"
	"github.com/google/uuid"
)

// =============================================================================
// Controls
// =============================================================================

// GetControls retrieves controls for a tenant
func GetControls(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"controls": []interface{}{},
		"total":    0,
	})
}

// CreateControl creates a new control
func CreateControl(c *gin.Context) {
	var req map[string]interface{}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":         uuid.New().String(),
		"created_at": time.Now().Format(time.RFC3339),
	})
}

// UpdateControl updates a control
func UpdateControl(c *gin.Context) {
	controlID := c.Param("controlId")

	c.JSON(http.StatusOK, gin.H{
		"id":         controlID,
		"updated_at": time.Now().Format(time.RFC3339),
	})
}

// DeleteControl deletes a control
func DeleteControl(c *gin.Context) {
	c.JSON(http.StatusNoContent, nil)
}

// =============================================================================
// Evidence
// =============================================================================

// GetEvidence retrieves evidence for a tenant
func GetEvidence(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"evidence": []interface{}{},
		"total":    0,
	})
}

// UploadEvidence uploads new evidence
func UploadEvidence(c *gin.Context) {
	// Handle file upload
	file, err := c.FormFile("file")
	if err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": "No file provided"})
		return
	}

	c.JSON(http.StatusCreated, gin.H{
		"id":          uuid.New().String(),
		"filename":    file.Filename,
		"size":        file.Size,
		"uploaded_at": time.Now().Format(time.RFC3339),
	})
}

// UpdateEvidence updates evidence metadata
func UpdateEvidence(c *gin.Context) {
	evidenceID := c.Param("evidenceId")

	c.JSON(http.StatusOK, gin.H{
		"id":         evidenceID,
		"updated_at": time.Now().Format(time.RFC3339),
	})
}

// DeleteEvidence deletes evidence
func DeleteEvidence(c *gin.Context) {
	c.JSON(http.StatusNoContent, nil)
}

// =============================================================================
// Obligations
// =============================================================================

// GetObligations retrieves regulatory obligations
func GetObligations(c *gin.Context) {
	c.JSON(http.StatusOK, gin.H{
		"obligations": []interface{}{},
		"total":       0,
	})
}

// RunAssessment runs a compliance assessment
func RunAssessment(c *gin.Context) {
	var req map[string]interface{}
	if err := c.ShouldBindJSON(&req); err != nil {
		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
		return
	}

	// In production, this would call the compliance engine
	c.JSON(http.StatusOK, gin.H{
		"assessment_id": uuid.New().String(),
		"score":         78,
		"trend":         "UP",
		"by_regulation": gin.H{
			"DSGVO":  85,
			"NIS2":   72,
			"AI_Act": 65,
		},
		"completed_at": time.Now().Format(time.RFC3339),
	})
}

// =============================================================================
// Export
// =============================================================================

// ExportPDF exports a PDF report
func ExportPDF(c *gin.Context) {
	reportType := c.Query("type")
	if reportType == "" {
		reportType = "summary"
	}

	// In production, generate actual PDF
	c.Header("Content-Type", "application/pdf")
	c.Header("Content-Disposition", "attachment; filename=compliance-report.pdf")

	c.JSON(http.StatusOK, gin.H{
		"message": "PDF generation would happen here",
		"type":    reportType,
	})
}

// ExportDOCX exports a Word document
func ExportDOCX(c *gin.Context) {
	reportType := c.Query("type")
	if reportType == "" {
		reportType = "summary"
	}

	c.Header("Content-Type", "application/vnd.openxmlformats-officedocument.wordprocessingml.document")
	c.Header("Content-Disposition", "attachment; filename=compliance-report.docx")

	c.JSON(http.StatusOK, gin.H{
		"message": "DOCX generation would happen here",
		"type":    reportType,
	})
}