package controllers

import (
	"context"
	"lokistack/dto"
	"lokistack/models"
	"lokistack/services"
	"lokistack/utils"
	"time"

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

type DeploymentController struct {
	service *services.DeploymentService
}

func NewDeploymentController() *DeploymentController {
	return &DeploymentController{service: services.NewDeploymentService()}
}

func (ctrl *DeploymentController) Create(c *gin.Context) {
	var req dto.CreateDeploymentRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	deployment, err := ctrl.service.Create(&services.CreateDeploymentRequest{
		Name:            req.Name,
		Description:     req.Description,
		Version:         req.Version,
		Mode:            req.Mode,
		ClusterID:       req.ClusterID,
		HostID:          req.HostID,
		ListenIP:        req.ListenIP,
		ListenPort:      req.ListenPort,
		Namespace:       req.Namespace,
		StorageConfigID: req.StorageConfigID,
		AuthEnabled:     req.AuthEnabled,
		RetentionDays:   req.RetentionDays,
		Replicas:        req.Replicas,
		ResourcesCPU:    req.ResourcesCPU,
		ResourcesMem:    req.ResourcesMem,
		StorageSize:     req.StorageSize,
		GrafanaEnabled:  req.GrafanaEnabled,
		GrafanaVersion:  req.GrafanaVersion,
	})
	if err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, models.SanitizedJSON(deployment))
}

func (ctrl *DeploymentController) Get(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	deployment, err := ctrl.service.Get(uint(id))
	if err != nil {
		utils.NotFound(c, "部署不存在")
		return
	}
	utils.Success(c, models.SanitizedJSON(deployment))
}

// Ready 部署就绪探测(经自动注册的数据源访问 Loki /ready)
func (ctrl *DeploymentController) Ready(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	d, err := ctrl.service.Get(uint(id))
	if err != nil {
		utils.NotFound(c, "部署不存在")
		return
	}
	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()
	ready, msg := services.DeploymentReady(ctx, d.Name)
	utils.Success(c, gin.H{"ready": ready, "message": msg})
}

// Preflight 向导预检:聚合存储/集群/主机/Loki/采集器状态
func (ctrl *DeploymentController) Preflight(c *gin.Context) {
	utils.Success(c, ctrl.service.Preflight())
}

// GetVersions 返回支持的 Loki 版本列表（前端部署表单版本下拉数据源）
func (ctrl *DeploymentController) GetVersions(c *gin.Context) {
	utils.Success(c, gin.H{"versions": services.LokiVersionList})
}

func (ctrl *DeploymentController) List(c *gin.Context) {
	page, pageSize := utils.Pagination(c)
	deployments, total, err := ctrl.service.List(page, pageSize)
	if err != nil {
		utils.Error(c, 500, err.Error())
		return
	}
	utils.Success(c, utils.PageData{
		List: models.SanitizedJSON(deployments), Total: total, Page: page, PageSize: pageSize,
	})
}

func (ctrl *DeploymentController) Update(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	var updates map[string]interface{}
	if !utils.BindAndValidate(c, &updates) {
		return
	}
	if err := ctrl.service.Update(uint(id), updates); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "updated"})
}

// UpdateRetention 校验 YAML 片段，保存部署配置，并可立即重部署。
func (ctrl *DeploymentController) UpdateRetention(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	var req dto.UpdateRetentionRequest
	if !utils.BindAndValidate(c, &req) {
		return
	}
	days, err := ctrl.service.UpdateRetention(uint(id), req.YAML, req.Apply)
	if err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"retentionDays": days, "applying": req.Apply})
}

// GetLiveConfig 返回运行中的完整 Loki YAML，服务层会先遮盖凭证。
func (ctrl *DeploymentController) GetLiveConfig(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	ctx, cancel := context.WithTimeout(c.Request.Context(), 15*time.Second)
	defer cancel()
	result, err := ctrl.service.GetLiveConfig(ctx, uint(id))
	if err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, result)
}

func (ctrl *DeploymentController) Delete(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	if err := ctrl.service.Delete(uint(id)); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "deleted"})
}

func (ctrl *DeploymentController) Deploy(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	if err := ctrl.service.StartDeploy(uint(id)); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "deployment started"})
}

func (ctrl *DeploymentController) Stop(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	if err := ctrl.service.StopDeployment(uint(id)); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "deployment stopped"})
}

func (ctrl *DeploymentController) Restart(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	if err := ctrl.service.RestartDeployment(uint(id)); err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, gin.H{"message": "deployment restarted"})
}

// GetUsage 返回 Loki 实例的资源用量（CPU/内存/限流），供页面判断是否需要扩容。
func (ctrl *DeploymentController) GetUsage(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	usage, err := ctrl.service.GetUsage(uint(id))
	if err != nil {
		utils.Error(c, 400, err.Error())
		return
	}
	utils.Success(c, usage)
}

func (ctrl *DeploymentController) GetLogs(c *gin.Context) {
	id, err := utils.IntParam(c, "id")
	if err != nil {
		utils.BadRequest(c, "ID 无效")
		return
	}
	page, pageSize := utils.Pagination(c)
	logs, total, err := ctrl.service.GetLogs(uint(id), page, pageSize)
	if err != nil {
		utils.Error(c, 500, err.Error())
		return
	}
	utils.Success(c, utils.PageData{
		List: logs, Total: total, Page: page, PageSize: pageSize,
	})
}

func (ctrl *DeploymentController) GetStats(c *gin.Context) {
	stats, err := ctrl.service.GetStats()
	if err != nil {
		utils.Error(c, 500, err.Error())
		return
	}
	utils.Success(c, stats)
}