package httpapi

import (
	"fmt"
	"net/http"
	"strconv"
	"strings"

	"inbox/internal/base/httpx"
	"inbox/internal/domain/topic"
	"inbox/internal/domain/workspace"
)

func (h *Handler) dashboardMessages(w http.ResponseWriter, r *http.Request) {
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.Messages(r.Context(), ws)
	})
}

func (h *Handler) dashboardTopics(w http.ResponseWriter, r *http.Request) {
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.Topics(r.Context(), ws)
	})
}

func (h *Handler) dashboardTopicRecords(w http.ResponseWriter, r *http.Request) {
	spaceFilter := strings.TrimSpace(r.URL.Query().Get("space"))
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.TopicRecords(r.Context(), ws, spaceFilter)
	})
}

func (h *Handler) dashboardSpaceTopics(w http.ResponseWriter, r *http.Request) {
	space, err := parseTopicSpace(r.PathValue("space"))
	if err != nil {
		httpx.WriteError(w, http.StatusBadRequest, err.Error())
		return
	}
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.SpaceTopics(r.Context(), ws, space)
	})
}

func (h *Handler) dashboardSpaceMessages(w http.ResponseWriter, r *http.Request) {
	space, err := parseTopicSpace(r.PathValue("space"))
	if err != nil {
		httpx.WriteError(w, http.StatusBadRequest, err.Error())
		return
	}
	topicSlug := strings.TrimSpace(r.URL.Query().Get("topic"))
	if topicSlug == "" {
		httpx.WriteError(w, http.StatusBadRequest, "topic is required")
		return
	}
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.SpaceMessages(r.Context(), ws, space, topicSlug)
	})
}

func (h *Handler) dashboardDispatch(w http.ResponseWriter, r *http.Request) {
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.Dispatch(r.Context(), ws)
	})
}

func (h *Handler) dashboardDispatchLive(w http.ResponseWriter, r *http.Request) {
	topicSlug := strings.TrimSpace(r.URL.Query().Get("topic"))
	roleName := strings.TrimSpace(r.URL.Query().Get("role"))
	if topicSlug == "" || roleName == "" {
		httpx.WriteError(w, http.StatusBadRequest, "topic and role are required")
		return
	}
	afterSeq, err := parseIntQuery(r, "offset")
	if err != nil {
		httpx.WriteError(w, http.StatusBadRequest, "offset must be an integer")
		return
	}
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.DispatchLive(r.Context(), ws, topicSlug, roleName, afterSeq)
	})
}

func (h *Handler) dashboardRoles(w http.ResponseWriter, r *http.Request) {
	ws, ok := h.optionalWorkspace(w, r)
	if !ok {
		return
	}
	payload, err := h.Dashboard.Roles(r.Context(), ws)
	writePayload(w, http.StatusOK, payload, err)
}

func (h *Handler) dashboardWorkflowBoard(w http.ResponseWriter, r *http.Request) {
	activeTopic := strings.TrimSpace(r.URL.Query().Get("topic"))
	h.writeWorkspacePayload(w, r, http.StatusOK, func(ws workspace.Workspace) (any, error) {
		return h.Dashboard.WorkflowBoard(r.Context(), ws, activeTopic)
	})
}

func (h *Handler) resolveWorkspace(r *http.Request) (workspace.Workspace, error) {
	return h.Workspaces.Resolve(
		r.Context(),
		r.URL.Query().Get("workspace_id"),
		firstNonEmpty(r.URL.Query().Get("workspace"), r.URL.Query().Get("workspace_slug")),
	)
}

func (h *Handler) requireWorkspace(w http.ResponseWriter, r *http.Request) (workspace.Workspace, bool) {
	ws, err := h.resolveWorkspace(r)
	if err != nil {
		writeStoreError(w, err)
		return workspace.Workspace{}, false
	}
	return ws, true
}

func (h *Handler) optionalWorkspace(w http.ResponseWriter, r *http.Request) (*workspace.Workspace, bool) {
	if strings.TrimSpace(firstNonEmpty(
		r.URL.Query().Get("workspace_id"),
		r.URL.Query().Get("workspace"),
		r.URL.Query().Get("workspace_slug"),
	)) == "" {
		return nil, true
	}
	ws, err := h.resolveWorkspace(r)
	if err != nil {
		writeStoreError(w, err)
		return nil, false
	}
	return &ws, true
}

func (h *Handler) writeWorkspacePayload(w http.ResponseWriter, r *http.Request, status int, load func(workspace.Workspace) (any, error)) {
	ws, ok := h.requireWorkspace(w, r)
	if !ok {
		return
	}
	payload, err := load(ws)
	writePayload(w, status, payload, err)
}

func writePayload(w http.ResponseWriter, status int, payload any, err error) {
	if err != nil {
		writeStoreError(w, err)
		return
	}
	httpx.WriteJSON(w, status, payload)
}

func parseTopicSpace(value string) (topic.Space, error) {
	switch topic.Space(value) {
	case topic.SpaceClarify, topic.SpaceWorkflow:
		return topic.Space(value), nil
	default:
		return "", fmt.Errorf("invalid space %q", value)
	}
}

func parseIntQuery(r *http.Request, key string) (int, error) {
	value := strings.TrimSpace(r.URL.Query().Get(key))
	if value == "" {
		return 0, nil
	}
	return strconv.Atoi(value)
}

func firstNonEmpty(values ...string) string {
	for _, value := range values {
		if strings.TrimSpace(value) != "" {
			return value
		}
	}
	return ""
}