/*
   GoToSocial
   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package blocks

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

	"github.com/gin-gonic/gin"
	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
	"github.com/superseriousbusiness/gotosocial/internal/oauth"
)

// BlocksGETHandler swagger:operation GET /api/v1/blocks blocksGet
//
// Get an array of accounts that requesting account has blocked.
//
// The next and previous queries can be parsed from the returned Link header.
// Example:
//
// ```
// <https://example.org/api/v1/blocks?limit=80&max_id=01FC0SKA48HNSVR6YKZCQGS2V8>; rel="next", <https://example.org/api/v1/blocks?limit=80&min_id=01FC0SKW5JK2Q4EVAV2B462YY0>; rel="prev"
// ````
//
//	---
//	tags:
//	- blocks
//
//	produces:
//	- application/json
//
//	parameters:
//	-
//		name: limit
//		type: integer
//		description: Number of blocks to return.
//		default: 20
//		in: query
//	-
//		name: max_id
//		type: string
//		description: >-
//			Return only blocks *OLDER* than the given block ID.
//			The block with the specified ID will not be included in the response.
//		in: query
//	-
//		name: since_id
//		type: string
//		description: >-
//		  Return only blocks *NEWER* than the given block ID.
//		  The block with the specified ID will not be included in the response.
//		in: query
//
//	security:
//	- OAuth2 Bearer:
//		- read:blocks
//
//	responses:
//		'200':
//			headers:
//				Link:
//					type: string
//					description: Links to the next and previous queries.
//			schema:
//				type: array
//				items:
//					"$ref": "#/definitions/account"
//		'400':
//			description: bad request
//		'401':
//			description: unauthorized
//		'404':
//			description: not found
//		'406':
//			description: not acceptable
//		'500':
//			description: internal server error
func (m *Module) BlocksGETHandler(c *gin.Context) {
	authed, err := oauth.Authed(c, true, true, true, true)
	if err != nil {
		apiutil.ErrorHandler(c, gtserror.NewErrorUnauthorized(err, err.Error()), m.processor.InstanceGet)
		return
	}

	if _, err := apiutil.NegotiateAccept(c, apiutil.JSONAcceptHeaders...); err != nil {
		apiutil.ErrorHandler(c, gtserror.NewErrorNotAcceptable(err, err.Error()), m.processor.InstanceGet)
		return
	}

	maxID := ""
	maxIDString := c.Query(MaxIDKey)
	if maxIDString != "" {
		maxID = maxIDString
	}

	sinceID := ""
	sinceIDString := c.Query(SinceIDKey)
	if sinceIDString != "" {
		sinceID = sinceIDString
	}

	limit := 20
	limitString := c.Query(LimitKey)
	if limitString != "" {
		i, err := strconv.ParseInt(limitString, 10, 32)
		if err != nil {
			err := fmt.Errorf("error parsing %s: %s", LimitKey, err)
			apiutil.ErrorHandler(c, gtserror.NewErrorBadRequest(err, err.Error()), m.processor.InstanceGet)
			return
		}
		limit = int(i)
	}

	resp, errWithCode := m.processor.BlocksGet(c.Request.Context(), authed, maxID, sinceID, limit)
	if errWithCode != nil {
		apiutil.ErrorHandler(c, errWithCode, m.processor.InstanceGet)
		return
	}

	if resp.LinkHeader != "" {
		c.Header("Link", resp.LinkHeader)
	}
	c.JSON(http.StatusOK, resp.Accounts)
}