package handlers

import (
	"context"
	"net/http"

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

// AddTaskRequest is the request body for POST /projects/{id}/sdlc/features/{slug}/tasks.
type AddTaskRequest struct {
	Title string `json:"title"`
}

// ListTasks returns all tasks for a feature.
// GET /projects/{id}/sdlc/features/{slug}/tasks
func (h *SDLCHandler) ListTasks(w http.ResponseWriter, r *http.Request) {
	projectID := chi.URLParam(r, "id")
	slug := chi.URLParam(r, "slug")

	ctx, cancel := context.WithTimeout(r.Context(), TimeoutStandard)
	defer cancel()

	tasks, err := h.sdlcService.ListTasks(ctx, projectID, slug)
	if err != nil {
		writeSDLCError(w, r, err)
		return
	}

	if tasks == nil {
		tasks = []sdlc.Task{}
	}
	api.WriteSuccess(w, r, tasks)
}

// AddTask adds a new task to a feature.
// POST /projects/{id}/sdlc/features/{slug}/tasks
func (h *SDLCHandler) AddTask(w http.ResponseWriter, r *http.Request) {
	projectID := chi.URLParam(r, "id")
	slug := chi.URLParam(r, "slug")

	var req AddTaskRequest
	if err := api.DecodeJSON(r, &req); err != nil {
		api.WriteBadRequest(w, r, "invalid request body")
		return
	}

	v := validate.New()
	v.Required(req.Title, "title")
	if err := v.Error(); err != nil {
		api.WriteBadRequest(w, r, err.Error())
		return
	}

	ctx, cancel := context.WithTimeout(r.Context(), TimeoutHeavyWrite)
	defer cancel()

	task, err := h.sdlcService.AddTask(ctx, projectID, slug, req.Title)
	if err != nil {
		writeSDLCError(w, r, err)
		return
	}

	api.WriteCreated(w, r, task)
}

// StartTask marks a task as in-progress.
// POST /projects/{id}/sdlc/features/{slug}/tasks/{taskId}/start
func (h *SDLCHandler) StartTask(w http.ResponseWriter, r *http.Request) {
	projectID := chi.URLParam(r, "id")
	slug := chi.URLParam(r, "slug")
	taskID := chi.URLParam(r, "taskId")

	ctx, cancel := context.WithTimeout(r.Context(), TimeoutHeavyWrite)
	defer cancel()

	if err := h.sdlcService.StartTask(ctx, projectID, slug, taskID); err != nil {
		writeSDLCError(w, r, err)
		return
	}

	api.WriteSuccess(w, r, map[string]any{
		"feature": slug,
		"task_id": taskID,
		"status":  "in_progress",
	})
}

// CompleteTask marks a task as complete.
// POST /projects/{id}/sdlc/features/{slug}/tasks/{taskId}/complete
func (h *SDLCHandler) CompleteTask(w http.ResponseWriter, r *http.Request) {
	projectID := chi.URLParam(r, "id")
	slug := chi.URLParam(r, "slug")
	taskID := chi.URLParam(r, "taskId")

	ctx, cancel := context.WithTimeout(r.Context(), TimeoutHeavyWrite)
	defer cancel()

	if err := h.sdlcService.CompleteTask(ctx, projectID, slug, taskID); err != nil {
		writeSDLCError(w, r, err)
		return
	}

	api.WriteSuccess(w, r, map[string]any{
		"feature": slug,
		"task_id": taskID,
		"status":  "complete",
	})
}

// BlockTask marks a task as blocked.
// POST /projects/{id}/sdlc/features/{slug}/tasks/{taskId}/block
func (h *SDLCHandler) BlockTask(w http.ResponseWriter, r *http.Request) {
	projectID := chi.URLParam(r, "id")
	slug := chi.URLParam(r, "slug")
	taskID := chi.URLParam(r, "taskId")

	ctx, cancel := context.WithTimeout(r.Context(), TimeoutHeavyWrite)
	defer cancel()

	if err := h.sdlcService.BlockTask(ctx, projectID, slug, taskID); err != nil {
		writeSDLCError(w, r, err)
		return
	}

	api.WriteSuccess(w, r, map[string]any{
		"feature": slug,
		"task_id": taskID,
		"status":  "blocked",
	})
}