package server

import (
	"net/http"
	"strings"

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

// The /api/v1/user/blocks/* handlers wire the per-user block list. A block is asymmetric:
// the blocker stops seeing everything from the blocked user (chat, nudge, requests,
// invitations, matchmaking) while the blocked user notices nothing; it overrides — but does
// not delete — any friendship (an unblock restores it). They reuse the friend handlers'
// targetIDRequest and account-ref resolution.

// blockListDTO is the accounts the caller has blocked, plus the per-game disguised-robot
// blocks (not real accounts), which the blocked list shows as distinct personalities.
type blockListDTO struct {
	Blocked []accountRefDTO `json:"blocked"`
	Robots  []robotBlockDTO `json:"robots"`
}

// robotBlockDTO is one per-game disguised-robot block: the row id (used to unblock it), the
// game name the player saw, and the game + seat it was blocked in (so the in-game card can
// re-mark that seat).
type robotBlockDTO struct {
	ID          string `json:"id"`
	DisplayName string `json:"display_name"`
	GameID      string `json:"game_id"`
	Seat        int    `json:"seat"`
}

// handleBlock blocks the body-supplied account.
func (s *Server) handleBlock(c *gin.Context) {
	uid, ok := userID(c)
	if !ok {
		abortBadRequest(c, "missing identity")
		return
	}
	var req targetIDRequest
	if err := c.ShouldBindJSON(&req); err != nil {
		abortBadRequest(c, "invalid request body")
		return
	}
	target, ok := parseUUIDField(req.AccountID)
	if !ok {
		abortBadRequest(c, "invalid account id")
		return
	}
	// An in-game block carries the game id, so a disguised-robot opponent is recorded as a
	// per-game block (BlockInGame); a settings-screen block (no game) blocks a human directly.
	var err error
	if strings.TrimSpace(req.GameID) == "" {
		err = s.social.Block(c.Request.Context(), uid, target)
	} else if gameID, ok := parseUUIDField(req.GameID); !ok {
		abortBadRequest(c, "invalid game id")
		return
	} else {
		err = s.social.BlockInGame(c.Request.Context(), uid, target, gameID)
	}
	if err != nil {
		s.abortErr(c, err)
		return
	}
	c.JSON(http.StatusOK, okResponse{OK: true})
}

// handleUnblock removes the caller's block on the :id account.
func (s *Server) handleUnblock(c *gin.Context) {
	uid, ok := userID(c)
	if !ok {
		abortBadRequest(c, "missing identity")
		return
	}
	target, err := uuid.Parse(c.Param("id"))
	if err != nil {
		abortBadRequest(c, "invalid account id")
		return
	}
	if err := s.social.Unblock(c.Request.Context(), uid, target); err != nil {
		s.abortErr(c, err)
		return
	}
	c.JSON(http.StatusOK, okResponse{OK: true})
}

// handleListBlocks returns the accounts the caller has blocked.
func (s *Server) handleListBlocks(c *gin.Context) {
	uid, ok := userID(c)
	if !ok {
		abortBadRequest(c, "missing identity")
		return
	}
	ctx := c.Request.Context()
	ids, err := s.social.ListBlocks(ctx, uid)
	if err != nil {
		s.abortErr(c, err)
		return
	}
	robots, err := s.social.ListRobotBlocks(ctx, uid)
	if err != nil {
		s.abortErr(c, err)
		return
	}
	dto := blockListDTO{Blocked: s.accountRefs(ctx, ids)}
	for _, r := range robots {
		dto.Robots = append(dto.Robots, robotBlockDTO{ID: r.ID.String(), DisplayName: r.DisplayName, GameID: r.GameID.String(), Seat: r.Seat})
	}
	c.JSON(http.StatusOK, dto)
}