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

import (
	"encoding/json"
	"net/http"

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

// ProjectsHandler handles project-related endpoints.
type ProjectsHandler struct{}

// NewProjectsHandler creates a new projects handler.
func NewProjectsHandler() *ProjectsHandler {
	return &ProjectsHandler{}
}

// Mount registers the projects routes.
func (h *ProjectsHandler) Mount(r api.Router) {
	r.Route("/projects", func(r chi.Router) {
		r.Get("/", h.List)
		r.Get("/{id}", h.Get)
		r.Post("/{id}/claude", h.RunClaude)
		r.Post("/{id}/shell", h.RunShell)
		r.Post("/{id}/git", h.RunGit)
		r.Get("/{id}/events", h.Events)
	})
}

// List returns all available projects.
// GET /projects
func (h *ProjectsHandler) List(w http.ResponseWriter, r *http.Request) {
	// TODO: Implement project discovery from K8s
	projects := []map[string]any{
		{
			"id":          "pantheon",
			"name":        "Pantheon",
			"description": "Go API backend",
			"pod":         "claudebox-pantheon-0",
			"status":      "running",
		},
		{
			"id":          "aeries",
			"name":        "Aeries",
			"description": "Note community platform",
			"pod":         "claudebox-aeries-0",
			"status":      "running",
		},
	}

	api.WriteSuccess(w, r, projects)
}

// Get returns a specific project by ID.
// GET /projects/{id}
func (h *ProjectsHandler) Get(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	// TODO: Look up project from registry
	project := map[string]any{
		"id":          id,
		"name":        id,
		"description": "Project description",
		"pod":         "claudebox-" + id + "-0",
		"status":      "running",
		"workspace":   "/workspace",
		"config": map[string]any{
			"claude_auth":  true,
			"git_enabled":  true,
			"last_command": nil,
		},
	}

	api.WriteSuccess(w, r, project)
}

// RunClaude executes a Claude command in the project's claudebox.
// POST /projects/{id}/claude
func (h *ProjectsHandler) RunClaude(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	// TODO: Parse request body for prompt
	// TODO: Execute kubectl exec -n rdev claudebox-{id}-0 -- claude "{prompt}"

	result := map[string]any{
		"id":         "cmd-" + id + "-001",
		"project":    id,
		"type":       "claude",
		"status":     "queued",
		"stream_url": "/projects/" + id + "/events?stream_id=cmd-" + id + "-001",
	}

	api.WriteCreated(w, r, result)
}

// RunShell executes a shell command in the project's claudebox.
// POST /projects/{id}/shell
func (h *ProjectsHandler) RunShell(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	// TODO: Parse request body for command
	// TODO: Execute kubectl exec -n rdev claudebox-{id}-0 -- bash -c "{command}"

	result := map[string]any{
		"id":         "cmd-" + id + "-002",
		"project":    id,
		"type":       "shell",
		"status":     "queued",
		"stream_url": "/projects/" + id + "/events?stream_id=cmd-" + id + "-002",
	}

	api.WriteCreated(w, r, result)
}

// RunGit executes a git command in the project's claudebox.
// POST /projects/{id}/git
func (h *ProjectsHandler) RunGit(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")

	// TODO: Parse request body for git command
	// TODO: Execute kubectl exec -n rdev claudebox-{id}-0 -- git {args}

	result := map[string]any{
		"id":         "cmd-" + id + "-003",
		"project":    id,
		"type":       "git",
		"status":     "queued",
		"stream_url": "/projects/" + id + "/events?stream_id=cmd-" + id + "-003",
	}

	api.WriteCreated(w, r, result)
}

// Events streams command output via Server-Sent Events.
// GET /projects/{id}/events
func (h *ProjectsHandler) Events(w http.ResponseWriter, r *http.Request) {
	id := chi.URLParam(r, "id")
	streamID := r.URL.Query().Get("stream_id")

	// Set SSE headers
	w.Header().Set("Content-Type", "text/event-stream")
	w.Header().Set("Cache-Control", "no-cache")
	w.Header().Set("Connection", "keep-alive")
	w.Header().Set("Access-Control-Allow-Origin", "*")

	flusher, ok := w.(http.Flusher)
	if !ok {
		http.Error(w, "SSE not supported", http.StatusInternalServerError)
		return
	}

	// TODO: Stream actual command output
	// For now, send mock events

	// Send initial connected event
	writeSSE(w, flusher, "connected", map[string]any{
		"project":   id,
		"stream_id": streamID,
	})

	// Send mock output
	writeSSE(w, flusher, "output", map[string]any{
		"line":   "Starting command execution...",
		"stream": "stdout",
	})

	writeSSE(w, flusher, "output", map[string]any{
		"line":   "Command completed successfully.",
		"stream": "stdout",
	})

	// Send complete event
	writeSSE(w, flusher, "complete", map[string]any{
		"exit_code":   0,
		"duration_ms": 1234,
	})
}

// writeSSE writes a Server-Sent Event.
func writeSSE(w http.ResponseWriter, flusher http.Flusher, event string, data map[string]any) {
	dataBytes, _ := jsonMarshal(data)
	w.Write([]byte("event: " + event + "\n"))
	w.Write([]byte("data: " + string(dataBytes) + "\n\n"))
	flusher.Flush()
}

// jsonMarshal is a simple JSON marshal helper.
func jsonMarshal(v any) ([]byte, error) {
	return json.Marshal(v)
}