// Package handlers provides HTTP handlers for the rdev API.
package handlers

import (
	"context"
	"encoding/json"
	"errors"
	"log/slog"
	"net/http"
	"time"

	"github.com/go-chi/chi/v5"
	"github.com/orchard9/rdev/internal/domain"
	"github.com/orchard9/rdev/internal/service"
	"github.com/orchard9/rdev/pkg/api"
)

// ProjectManagementHandler handles project lifecycle operations.
type ProjectManagementHandler struct {
	infraService *service.ProjectInfraService
	logger       *slog.Logger
}

// NewProjectManagementHandler creates a new project management handler.
func NewProjectManagementHandler(infraService *service.ProjectInfraService, logger *slog.Logger) *ProjectManagementHandler {
	if logger == nil {
		logger = slog.Default()
	}
	return &ProjectManagementHandler{
		infraService: infraService,
		logger:       logger,
	}
}

// Mount registers the project management routes.
func (h *ProjectManagementHandler) Mount(r api.Router) {
	r.Route("/project", func(r chi.Router) {
		r.Post("/", h.Create)         // POST /project - Create new project
		r.Get("/", h.List)            // GET /project - List all projects
		r.Get("/{name}", h.Status)    // GET /project/{name} - Get project status
		r.Delete("/{name}", h.Delete) // DELETE /project/{name} - Delete project
	})

	// Template endpoints
	r.Get("/templates", h.ListTemplates)      // GET /templates - List available templates
	r.Get("/templates/{name}", h.GetTemplate) // GET /templates/{name} - Get template details
}

// CreateRequest is the request body for POST /project.
type CreateRequest struct {
	Name        string `json:"name"`
	Description string `json:"description,omitempty"`
	Private     bool   `json:"private,omitempty"`
	Template    string `json:"template,omitempty"` // Template to seed repo (default: "default")
}

// Create creates a new project with git repo and DNS.
// POST /project
func (h *ProjectManagementHandler) Create(w http.ResponseWriter, r *http.Request) {
	// 90 second timeout to allow for Woodpecker sync retry (up to 45s)
	// plus Gitea repo creation, DNS, and template seeding
	ctx, cancel := context.WithTimeout(r.Context(), 90*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	var req CreateRequest
	if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
		api.WriteBadRequest(w, r, "invalid request body")
		return
	}

	if req.Name == "" {
		api.WriteBadRequest(w, r, "name is required")
		return
	}

	result, err := h.infraService.CreateProject(ctx, service.CreateProjectRequest{
		Name:        req.Name,
		Description: req.Description,
		Private:     req.Private,
		Template:    req.Template,
	})
	if err != nil {
		// Check for validation errors (user input) vs internal errors
		if errors.Is(err, domain.ErrInvalidProjectName) {
			api.WriteBadRequest(w, r, err.Error())
			return
		}
		// Log internal errors but return generic message to client
		h.logger.Error("project creation failed", "error", err, "name", req.Name)
		api.WriteInternalError(w, r, "failed to create project")
		return
	}

	api.WriteCreated(w, r, map[string]any{
		"project_id":  result.ProjectID,
		"name":        result.Name,
		"description": result.Description,
		"git": map[string]string{
			"owner":      result.GitRepoOwner,
			"name":       result.GitRepoName,
			"clone_ssh":  result.CloneSSH,
			"clone_http": result.CloneHTTP,
			"html_url":   result.HTMLURL,
		},
		"domain":     result.Domain,
		"url":        result.URL,
		"next_steps": result.NextSteps,
	})
}

// List returns all projects.
// GET /project
func (h *ProjectManagementHandler) List(w http.ResponseWriter, r *http.Request) {
	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	projects, err := h.infraService.ListProjects(ctx)
	if err != nil {
		h.logger.Error("failed to list projects", "error", err)
		api.WriteInternalError(w, r, "failed to list projects")
		return
	}

	// Convert to response format
	response := make([]map[string]any, len(projects))
	for i, p := range projects {
		response[i] = map[string]any{
			"project_id":  p.ProjectID,
			"name":        p.Name,
			"description": p.Description,
			"git": map[string]string{
				"clone_ssh":  p.CloneSSH,
				"clone_http": p.CloneHTTP,
				"html_url":   p.HTMLURL,
			},
			"domain": p.Domain,
			"url":    p.URL,
			"deployment": map[string]any{
				"status":         p.DeploymentStatus,
				"image":          p.DeploymentImage,
				"replicas":       p.DeploymentReplicas,
				"ready_replicas": p.ReadyReplicas,
			},
		}
	}

	api.WriteSuccess(w, r, response)
}

// Status returns the status of a specific project.
// GET /project/{name}
func (h *ProjectManagementHandler) Status(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	status, err := h.infraService.GetStatus(ctx, name)
	if err != nil {
		// Check if it's a "not found" error
		if errors.Is(err, domain.ErrProjectNotFound) {
			api.WriteNotFound(w, r, "project not found")
			return
		}
		h.logger.Error("failed to get project status", "error", err, "name", name)
		api.WriteInternalError(w, r, "failed to get project status")
		return
	}

	api.WriteSuccess(w, r, map[string]any{
		"project_id":  status.ProjectID,
		"name":        status.Name,
		"description": status.Description,
		"git": map[string]string{
			"owner":      status.GitRepoOwner,
			"name":       status.GitRepoName,
			"clone_ssh":  status.CloneSSH,
			"clone_http": status.CloneHTTP,
			"html_url":   status.HTMLURL,
		},
		"domain":        status.Domain,
		"custom_domain": status.CustomDomain,
		"url":           status.URL,
		"deployment": map[string]any{
			"status":         status.DeploymentStatus,
			"image":          status.DeploymentImage,
			"replicas":       status.DeploymentReplicas,
			"ready_replicas": status.ReadyReplicas,
		},
	})
}

// Delete removes a project and its associated resources.
// DELETE /project/{name}
func (h *ProjectManagementHandler) Delete(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	ctx, cancel := context.WithTimeout(r.Context(), 60*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	err := h.infraService.DeleteProject(ctx, name)
	if err != nil {
		// Check if it's a "not found" error
		if errors.Is(err, domain.ErrProjectNotFound) {
			api.WriteNotFound(w, r, "project not found")
			return
		}
		h.logger.Error("failed to delete project", "error", err, "name", name)
		api.WriteInternalError(w, r, "failed to delete project")
		return
	}

	api.WriteSuccess(w, r, map[string]string{
		"status":  "deleted",
		"project": name,
	})
}

// ListTemplates returns available project templates.
// GET /templates
func (h *ProjectManagementHandler) ListTemplates(w http.ResponseWriter, r *http.Request) {
	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	templates, err := h.infraService.ListTemplates(ctx)
	if err != nil {
		h.logger.Error("failed to list templates", "error", err)
		api.WriteInternalError(w, r, "failed to list templates")
		return
	}

	// Convert to response format
	response := make([]map[string]any, len(templates))
	for i, t := range templates {
		response[i] = map[string]any{
			"name":        t.Name,
			"description": t.Description,
			"stack":       t.Stack,
			"files":       t.Files,
		}
	}

	api.WriteSuccess(w, r, response)
}

// GetTemplate returns details about a specific template.
// GET /templates/{name}
func (h *ProjectManagementHandler) GetTemplate(w http.ResponseWriter, r *http.Request) {
	name := chi.URLParam(r, "name")
	ctx, cancel := context.WithTimeout(r.Context(), 10*time.Second)
	defer cancel()

	if h.infraService == nil {
		api.WriteInternalError(w, r, "project infrastructure service not configured")
		return
	}

	template, err := h.infraService.GetTemplate(ctx, name)
	if err != nil {
		if errors.Is(err, domain.ErrTemplateNotFound) {
			api.WriteNotFound(w, r, "template not found")
			return
		}
		h.logger.Error("failed to get template", "error", err, "name", name)
		api.WriteInternalError(w, r, "failed to get template")
		return
	}

	api.WriteSuccess(w, r, map[string]any{
		"name":        template.Name,
		"description": template.Description,
		"stack":       template.Stack,
		"files":       template.Files,
	})
}