// Copyright 2025 The Gitea Authors. All rights reserved.
// SPDX-License-Identifier: MIT

package repo

import (
	"net/http"

	"code.gitea.io/gitea/modules/markup"
	"code.gitea.io/gitea/modules/markup/markdown"
	"code.gitea.io/gitea/modules/setting"
	"code.gitea.io/gitea/services/context"
	sourcegraph_service "code.gitea.io/gitea/services/sourcegraph"
)

// sourcegraphRepoName returns the full repository name for Sourcegraph,
// which includes the server domain prefix (e.g., "git.example.com/owner/repo")
func sourcegraphRepoName(ctx *context.APIContext) string {
	return setting.Domain + "/" + ctx.Repo.Repository.FullName()
}

// SourcegraphHover returns hover information at a position
func SourcegraphHover(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/sourcegraph/hover repository repoSourcegraphHover
	// ---
	// summary: Get code intelligence hover info
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: path
	//   in: query
	//   description: file path
	//   type: string
	//   required: true
	// - name: line
	//   in: query
	//   description: line number (0-indexed)
	//   type: integer
	//   required: true
	// - name: character
	//   in: query
	//   description: character position (0-indexed)
	//   type: integer
	//   required: true
	// - name: ref
	//   in: query
	//   description: git ref (commit SHA, branch, tag)
	//   type: string
	//   required: true
	// responses:
	//   "200":
	//     description: hover information
	//   "400":
	//     "$ref": "#/responses/error"
	//   "404":
	//     "$ref": "#/responses/notFound"
	//   "503":
	//     description: Sourcegraph integration not available

	if !setting.Sourcegraph.Enabled {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph integration is not enabled")
		return
	}

	path := ctx.FormString("path")
	line := ctx.FormInt("line")
	char := ctx.FormInt("character")
	ref := ctx.FormString("ref")

	if path == "" || ref == "" {
		ctx.APIError(http.StatusBadRequest, "path and ref are required")
		return
	}

	client := sourcegraph_service.GetClient()
	if client == nil {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph client not initialized")
		return
	}

	result, err := client.Hover(ctx, sourcegraphRepoName(ctx), ref, path, line, char)
	if err != nil {
		ctx.APIError(http.StatusBadGateway, err)
		return
	}

	if result == nil {
		ctx.JSON(http.StatusOK, map[string]any{})
		return
	}

	// Render markdown content to HTML
	if result.Contents != "" {
		rendered, err := markdown.RenderString(markup.NewRenderContext(ctx).WithMetas(markup.ComposeSimpleDocumentMetas()), result.Contents)
		if err == nil {
			result.Contents = string(rendered)
		}
	}

	ctx.JSON(http.StatusOK, result)
}

// SourcegraphDefinition returns definition locations for a symbol
func SourcegraphDefinition(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/sourcegraph/definition repository repoSourcegraphDefinition
	// ---
	// summary: Get code intelligence definition locations
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: path
	//   in: query
	//   description: file path
	//   type: string
	//   required: true
	// - name: line
	//   in: query
	//   description: line number (0-indexed)
	//   type: integer
	//   required: true
	// - name: character
	//   in: query
	//   description: character position (0-indexed)
	//   type: integer
	//   required: true
	// - name: ref
	//   in: query
	//   description: git ref (commit SHA, branch, tag)
	//   type: string
	//   required: true
	// responses:
	//   "200":
	//     description: definition locations
	//   "400":
	//     "$ref": "#/responses/error"
	//   "404":
	//     "$ref": "#/responses/notFound"
	//   "503":
	//     description: Sourcegraph integration not available

	if !setting.Sourcegraph.Enabled {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph integration is not enabled")
		return
	}

	path := ctx.FormString("path")
	line := ctx.FormInt("line")
	char := ctx.FormInt("character")
	ref := ctx.FormString("ref")

	if path == "" || ref == "" {
		ctx.APIError(http.StatusBadRequest, "path and ref are required")
		return
	}

	client := sourcegraph_service.GetClient()
	if client == nil {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph client not initialized")
		return
	}

	result, err := client.Definition(ctx, sourcegraphRepoName(ctx), ref, path, line, char)
	if err != nil {
		ctx.APIError(http.StatusBadGateway, err)
		return
	}

	if result == nil {
		result = []sourcegraph_service.Location{}
	}

	ctx.JSON(http.StatusOK, result)
}

// SourcegraphReferences returns reference locations for a symbol
func SourcegraphReferences(ctx *context.APIContext) {
	// swagger:operation GET /repos/{owner}/{repo}/sourcegraph/references repository repoSourcegraphReferences
	// ---
	// summary: Get code intelligence reference locations
	// produces:
	// - application/json
	// parameters:
	// - name: owner
	//   in: path
	//   description: owner of the repo
	//   type: string
	//   required: true
	// - name: repo
	//   in: path
	//   description: name of the repo
	//   type: string
	//   required: true
	// - name: path
	//   in: query
	//   description: file path
	//   type: string
	//   required: true
	// - name: line
	//   in: query
	//   description: line number (0-indexed)
	//   type: integer
	//   required: true
	// - name: character
	//   in: query
	//   description: character position (0-indexed)
	//   type: integer
	//   required: true
	// - name: ref
	//   in: query
	//   description: git ref (commit SHA, branch, tag)
	//   type: string
	//   required: true
	// responses:
	//   "200":
	//     description: reference locations
	//   "400":
	//     "$ref": "#/responses/error"
	//   "404":
	//     "$ref": "#/responses/notFound"
	//   "503":
	//     description: Sourcegraph integration not available

	if !setting.Sourcegraph.Enabled {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph integration is not enabled")
		return
	}

	path := ctx.FormString("path")
	line := ctx.FormInt("line")
	char := ctx.FormInt("character")
	ref := ctx.FormString("ref")

	if path == "" || ref == "" {
		ctx.APIError(http.StatusBadRequest, "path and ref are required")
		return
	}

	client := sourcegraph_service.GetClient()
	if client == nil {
		ctx.APIError(http.StatusServiceUnavailable, "Sourcegraph client not initialized")
		return
	}

	result, err := client.References(ctx, sourcegraphRepoName(ctx), ref, path, line, char)
	if err != nil {
		ctx.APIError(http.StatusBadGateway, err)
		return
	}

	if result == nil {
		result = []sourcegraph_service.Location{}
	}

	ctx.JSON(http.StatusOK, result)
}