package main

import (
	"bytes"
	"html/template"
	"net/http"
	"path/filepath"
	"strings"

	chroma_formatters_html "github.com/alecthomas/chroma/v2/formatters/html"
	chroma_lexers "github.com/alecthomas/chroma/v2/lexers"
	chroma_styles "github.com/alecthomas/chroma/v2/styles"
	"github.com/go-git/go-git/v5"
	"github.com/go-git/go-git/v5/plumbing/object"
	"github.com/microcosm-cc/bluemonday"
	"github.com/yuin/goldmark"
)

func handle_repo_tree(w http.ResponseWriter, r *http.Request) {
	data := make(map[string]any)
	// TODO: Sanitize path values
	category_name, repo_name, path_spec := r.PathValue("category_name"), r.PathValue("repo_name"), strings.TrimSuffix(r.PathValue("rest"), "/")
	data["category_name"], data["repo_name"], data["path_spec"] = category_name, repo_name, path_spec
	repo, err := git.PlainOpen(filepath.Join(config.Git.Root, category_name, repo_name+".git"))
	if err != nil {
		_, _ = w.Write([]byte("Error opening repo: " + err.Error()))
		return
	}
	head, err := repo.Head()
	if err != nil {
		_, _ = w.Write([]byte("Error getting repo HEAD: " + err.Error()))
		return
	}
	head_hash := head.Hash()
	commit_iter, err := repo.Log(&git.LogOptions{From: head_hash})
	if err != nil {
		_, _ = w.Write([]byte("Error getting repo commits: " + err.Error()))
		return
	}
	recent_commits := make([]*object.Commit, 0)
	defer commit_iter.Close()
	for range 3 {
		this_recent_commit, err := commit_iter.Next()
		if err != nil {
			_, _ = w.Write([]byte("Error getting a recent commit: " + err.Error()))
			return
		}
		recent_commits = append(recent_commits, this_recent_commit)
	}
	data["commits"] = recent_commits
	commit_object, err := repo.CommitObject(head_hash)
	if err != nil {
		_, _ = w.Write([]byte("Error getting commit object: " + err.Error()))
		return
	}
	tree, err := commit_object.Tree()
	if err != nil {
		_, _ = w.Write([]byte("Error getting file tree: " + err.Error()))
		return
	}

	target, err := tree.Tree(path_spec)
	if err != nil {
		file, err := tree.File(path_spec)
		if err != nil {
			_, _ = w.Write([]byte("Error retrieving path: " + err.Error()))
			return
		}
		file_contents, err := file.Contents()
		if err != nil {
			_, _ = w.Write([]byte("Error reading file: " + err.Error()))
			return
		}
		lexer := chroma_lexers.Match(path_spec)
		if lexer == nil {
			lexer = chroma_lexers.Fallback
		}
		iterator, err := lexer.Tokenise(nil, file_contents)
		if err != nil {
			_, _ = w.Write([]byte("Error rendering code: " + err.Error()))
			return
		}
		var formatted_unencapsulated bytes.Buffer

		style := chroma_styles.Get("xcode")

		style := chroma_styles.Get("autumn")

		formatter := chroma_formatters_html.New(chroma_formatters_html.WithClasses(true), chroma_formatters_html.TabWidth(8))
		formatter.Format(&formatted_unencapsulated, style, iterator)
		formatted_encapsulated := template.HTML(formatted_unencapsulated.Bytes())
		data["file_contents"] = formatted_encapsulated

		err = templates.ExecuteTemplate(w, "repo_tree_file", data)
		if err != nil {
			_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
			return
		}
		return
	}

	readme_file, err := target.File("README.md")
	if err != nil {
		data["readme"] = "There is no README for this directory."
	} else {
		readme_file_contents, err := readme_file.Contents()
		if err != nil {
			data["readme"] = "There is no README for this directory."
		} else {
			var readme_rendered_unsafe bytes.Buffer
			err = goldmark.Convert([]byte(readme_file_contents), &readme_rendered_unsafe)
			if err != nil {
				readme_rendered_unsafe.WriteString("Unable to render README: " + err.Error())
			}
			readme_rendered_safe := template.HTML(bluemonday.UGCPolicy().SanitizeBytes(readme_rendered_unsafe.Bytes()))
			data["readme"] = readme_rendered_safe
		}
	}

	display_git_tree := make([]display_git_tree_entry_t, 0)
	for _, entry := range target.Entries {
		display_git_tree_entry := display_git_tree_entry_t{}
		os_mode, err := entry.Mode.ToOSFileMode()
		if err != nil {
			display_git_tree_entry.Mode = "----"
		} else {
			display_git_tree_entry.Mode = os_mode.String()[:4]
		}
		display_git_tree_entry.Is_file = entry.Mode.IsFile()
		display_git_tree_entry.Size, err = target.Size(entry.Name)
		if err != nil {
			display_git_tree_entry.Size = 0
		}
		display_git_tree_entry.Name = entry.Name
		display_git_tree = append(display_git_tree, display_git_tree_entry)
	}
	data["files"] = display_git_tree

	err = templates.ExecuteTemplate(w, "repo_tree_dir", data)
	if err != nil {
		_, _ = w.Write([]byte("Error rendering template: " + err.Error()))
		return
	}
}

/* Background */ .bg { background-color: #ffffff; }
/* PreWrapper */ .chroma { background-color: #ffffff; }

/* Error */ .chroma .err { color: #000000 }

/* Error */ .chroma .err { color: #ff0000; background-color: #ffaaaa }

/* LineLink */ .chroma .lnlinks { outline: none; text-decoration: none; color: inherit }
/* LineTableTD */ .chroma .lntd { vertical-align: top; padding: 0; margin: 0; border: 0; }
/* LineTable */ .chroma .lntable { border-spacing: 0; padding: 0; margin: 0; border: 0; }
/* LineHighlight */ .chroma .hl { background-color: #e5e5e5 }
/* LineNumbersTable */ .chroma .lnt { white-space: pre; -webkit-user-select: none; user-select: none; margin-right: 0.4em; padding: 0 0.4em 0 0.4em;color: #7f7f7f }
/* LineNumbers */ .chroma .ln { white-space: pre; -webkit-user-select: none; user-select: none; margin-right: 0.4em; padding: 0 0.4em 0 0.4em;color: #7f7f7f }
/* Line */ .chroma .line { display: flex; }

/* Keyword */ .chroma .k { color: #a90d91 }
/* KeywordConstant */ .chroma .kc { color: #a90d91 }
/* KeywordDeclaration */ .chroma .kd { color: #a90d91 }
/* KeywordNamespace */ .chroma .kn { color: #a90d91 }
/* KeywordPseudo */ .chroma .kp { color: #a90d91 }
/* KeywordReserved */ .chroma .kr { color: #a90d91 }
/* KeywordType */ .chroma .kt { color: #a90d91 }
/* Name */ .chroma .n { color: #000000 }
/* NameAttribute */ .chroma .na { color: #836c28 }
/* NameBuiltin */ .chroma .nb { color: #a90d91 }
/* NameBuiltinPseudo */ .chroma .bp { color: #5b269a }
/* NameClass */ .chroma .nc { color: #3f6e75 }
/* NameConstant */ .chroma .no { color: #000000 }
/* NameDecorator */ .chroma .nd { color: #000000 }
/* NameEntity */ .chroma .ni { color: #000000 }
/* NameException */ .chroma .ne { color: #000000 }
/* NameFunction */ .chroma .nf { color: #000000 }
/* NameFunctionMagic */ .chroma .fm { color: #000000 }
/* NameLabel */ .chroma .nl { color: #000000 }
/* NameNamespace */ .chroma .nn { color: #000000 }
/* NameOther */ .chroma .nx { color: #000000 }
/* NameProperty */ .chroma .py { color: #000000 }
/* NameTag */ .chroma .nt { color: #000000 }
/* NameVariable */ .chroma .nv { color: #000000 }
/* NameVariableClass */ .chroma .vc { color: #000000 }
/* NameVariableGlobal */ .chroma .vg { color: #000000 }
/* NameVariableInstance */ .chroma .vi { color: #000000 }
/* NameVariableMagic */ .chroma .vm { color: #000000 }
/* Literal */ .chroma .l { color: #1c01ce }
/* LiteralDate */ .chroma .ld { color: #1c01ce }
/* LiteralString */ .chroma .s { color: #c41a16 }
/* LiteralStringAffix */ .chroma .sa { color: #c41a16 }
/* LiteralStringBacktick */ .chroma .sb { color: #c41a16 }
/* LiteralStringChar */ .chroma .sc { color: #2300ce }
/* LiteralStringDelimiter */ .chroma .dl { color: #c41a16 }
/* LiteralStringDoc */ .chroma .sd { color: #c41a16 }
/* LiteralStringDouble */ .chroma .s2 { color: #c41a16 }
/* LiteralStringEscape */ .chroma .se { color: #c41a16 }
/* LiteralStringHeredoc */ .chroma .sh { color: #c41a16 }
/* LiteralStringInterpol */ .chroma .si { color: #c41a16 }
/* LiteralStringOther */ .chroma .sx { color: #c41a16 }
/* LiteralStringRegex */ .chroma .sr { color: #c41a16 }
/* LiteralStringSingle */ .chroma .s1 { color: #c41a16 }
/* LiteralStringSymbol */ .chroma .ss { color: #c41a16 }
/* LiteralNumber */ .chroma .m { color: #1c01ce }
/* LiteralNumberBin */ .chroma .mb { color: #1c01ce }
/* LiteralNumberFloat */ .chroma .mf { color: #1c01ce }
/* LiteralNumberHex */ .chroma .mh { color: #1c01ce }
/* LiteralNumberInteger */ .chroma .mi { color: #1c01ce }
/* LiteralNumberIntegerLong */ .chroma .il { color: #1c01ce }
/* LiteralNumberOct */ .chroma .mo { color: #1c01ce }
/* Operator */ .chroma .o { color: #000000 }
/* OperatorWord */ .chroma .ow { color: #000000 }
/* Comment */ .chroma .c { color: #177500 }
/* CommentHashbang */ .chroma .ch { color: #177500 }
/* CommentMultiline */ .chroma .cm { color: #177500 }
/* CommentSingle */ .chroma .c1 { color: #177500 }
/* CommentSpecial */ .chroma .cs { color: #177500 }
/* CommentPreproc */ .chroma .cp { color: #633820 }
/* CommentPreprocFile */ .chroma .cpf { color: #633820 }

/* Keyword */ .chroma .k { color: #0000aa }
/* KeywordConstant */ .chroma .kc { color: #0000aa }
/* KeywordDeclaration */ .chroma .kd { color: #0000aa }
/* KeywordNamespace */ .chroma .kn { color: #0000aa }
/* KeywordPseudo */ .chroma .kp { color: #0000aa }
/* KeywordReserved */ .chroma .kr { color: #0000aa }
/* KeywordType */ .chroma .kt { color: #00aaaa }
/* NameAttribute */ .chroma .na { color: #1e90ff }
/* NameBuiltin */ .chroma .nb { color: #00aaaa }
/* NameClass */ .chroma .nc { color: #00aa00; text-decoration: underline }
/* NameConstant */ .chroma .no { color: #aa0000 }
/* NameDecorator */ .chroma .nd { color: #888888 }
/* NameEntity */ .chroma .ni { color: #880000; font-weight: bold }
/* NameFunction */ .chroma .nf { color: #00aa00 }
/* NameNamespace */ .chroma .nn { color: #00aaaa; text-decoration: underline }
/* NameTag */ .chroma .nt { color: #1e90ff; font-weight: bold }
/* NameVariable */ .chroma .nv { color: #aa0000 }
/* LiteralString */ .chroma .s { color: #aa5500 }
/* LiteralStringAffix */ .chroma .sa { color: #aa5500 }
/* LiteralStringBacktick */ .chroma .sb { color: #aa5500 }
/* LiteralStringChar */ .chroma .sc { color: #aa5500 }
/* LiteralStringDelimiter */ .chroma .dl { color: #aa5500 }
/* LiteralStringDoc */ .chroma .sd { color: #aa5500 }
/* LiteralStringDouble */ .chroma .s2 { color: #aa5500 }
/* LiteralStringEscape */ .chroma .se { color: #aa5500 }
/* LiteralStringHeredoc */ .chroma .sh { color: #aa5500 }
/* LiteralStringInterpol */ .chroma .si { color: #aa5500 }
/* LiteralStringOther */ .chroma .sx { color: #aa5500 }
/* LiteralStringRegex */ .chroma .sr { color: #009999 }
/* LiteralStringSingle */ .chroma .s1 { color: #aa5500 }
/* LiteralStringSymbol */ .chroma .ss { color: #0000aa }
/* LiteralNumber */ .chroma .m { color: #009999 }
/* LiteralNumberBin */ .chroma .mb { color: #009999 }
/* LiteralNumberFloat */ .chroma .mf { color: #009999 }
/* LiteralNumberHex */ .chroma .mh { color: #009999 }
/* LiteralNumberInteger */ .chroma .mi { color: #009999 }
/* LiteralNumberIntegerLong */ .chroma .il { color: #009999 }
/* LiteralNumberOct */ .chroma .mo { color: #009999 }
/* OperatorWord */ .chroma .ow { color: #0000aa }
/* Comment */ .chroma .c { color: #aaaaaa; font-style: italic }
/* CommentHashbang */ .chroma .ch { color: #aaaaaa; font-style: italic }
/* CommentMultiline */ .chroma .cm { color: #aaaaaa; font-style: italic }
/* CommentSingle */ .chroma .c1 { color: #aaaaaa; font-style: italic }
/* CommentSpecial */ .chroma .cs { color: #0000aa; font-style: italic }
/* CommentPreproc */ .chroma .cp { color: #4c8317 }
/* CommentPreprocFile */ .chroma .cpf { color: #4c8317 }
/* GenericDeleted */ .chroma .gd { color: #aa0000 }
/* GenericEmph */ .chroma .ge { font-style: italic }
/* GenericError */ .chroma .gr { color: #aa0000 }
/* GenericHeading */ .chroma .gh { color: #000080; font-weight: bold }
/* GenericInserted */ .chroma .gi { color: #00aa00 }
/* GenericOutput */ .chroma .go { color: #888888 }
/* GenericPrompt */ .chroma .gp { color: #555555 }
/* GenericStrong */ .chroma .gs { font-weight: bold }
/* GenericSubheading */ .chroma .gu { color: #800080; font-weight: bold }
/* GenericTraceback */ .chroma .gt { color: #aa0000 }
/* GenericUnderline */ .chroma .gl { text-decoration: underline }
/* TextWhitespace */ .chroma .w { color: #bbbbbb }