module main

import veb
import validation
import api

struct ItemWithUser[T] {
    item T
    user User
}

type IssueWithUser = ItemWithUser[Issue]
type CommentWithUser = ItemWithUser[Comment]

@['/api/v1/:username/:repo_name/issues/count']
fn (mut app App) handle_issues_count(username string, repo_name string) veb.Result {
    has_access := app.has_user_repo_read_access_by_repo_name(ctx, ctx.user.id, username, repo_name)
    if !has_access {
        return ctx.json_error('Not found')
    }
    repo := app.find_repo_by_name_and_username(repo_name, username) or {
        return ctx.json_error('Not found')
    }
    count := app.get_repo_issue_count(repo.id)
    return ctx.json(api.ApiIssueCount{
        success: true
        result:  count
    })
}

@['/:username/:repo_name/issues/new']
pub fn (mut app App) new_issue(mut ctx Context, username string, repo_name string) veb.Result {
    if !ctx.logged_in {
        return ctx.not_found()
    }
    repo := app.find_repo_by_name_and_username(repo_name, username) or { return ctx.not_found() }
    ctx.set_page_title(['New issue', '${repo.user_name}/${repo.name}'])
    return $veb.html()
}

@['/:username/issues']
pub fn (mut app App) handle_get_user_issues(mut ctx Context, username string) veb.Result {
    return app.user_issues(mut ctx, username, 'created')
}

@['/:username/:repo_name/issues'; post]
pub fn (mut app App) handle_add_repo_issue(mut ctx Context, username string, repo_name string) veb.Result {
    // TODO: use captcha instead of user restrictions
    if !ctx.logged_in || (ctx.logged_in && ctx.user.posts_count >= posts_per_day) {
        return ctx.redirect_to_index()
    }
    repo := app.find_repo_by_name_and_username(repo_name, username) or { return ctx.not_found() }
    title := ctx.form['title']
    text := ctx.form['text']
    is_title_empty := validation.is_string_empty(title)
    is_text_empty := validation.is_string_empty(text)
    if is_title_empty || is_text_empty {
        return ctx.redirect('/${username}/${repo_name}/issues/new')
    }
    app.increment_user_post(mut ctx.user) or { app.info(err.str()) }
    app.add_issue(repo.id, ctx.user.id, title, text) or { app.info(err.str()) }
    app.increment_repo_issues(repo.id) or { app.info(err.str()) }
    app.dispatch_webhook(repo.id, 'issue', WebhookIssuePayload{
        action: 'opened'
        repo:   '${username}/${repo_name}'
        title:  title
        author: ctx.user.username
    })
    has_first_issue_activity := app.has_activity(ctx.user.id, 'first_issue')
    if !has_first_issue_activity {
        app.add_activity(ctx.user.id, 'first_issue') or { app.info(err.str()) }
    }
    return ctx.redirect('/${username}/${repo_name}/issues')
}

@['/:username/:repo_name/issues']
pub fn (mut app App) handle_get_repo_issues(mut ctx Context, username string, repo_name string) veb.Result {
    return app.issues(mut ctx, username, repo_name, '0')
}

@['/:username/:repo_name/issues/:page']
pub fn (mut app App) issues(mut ctx Context, username string, repo_name string, page string) veb.Result {
    repo := app.find_repo_by_name_and_username(repo_name, username) or { return ctx.not_found() }
    page_i := page.int()
    mut issues_with_users := []IssueWithUser{}
    mut issue := Issue{}
    mut user := User{}
    repo_issues := app.find_repo_issues_as_page(repo.id, page_i)
    mut i := 0
    for i = 0; i < repo_issues.len; i++ {
        issue = repo_issues[i]
        user = app.get_user_by_id(issue.author_id) or { continue }
        issue.labels = app.get_issue_labels(issue.id)
        issue.repo_author = repo.user_name
        issue.repo_name = repo.name
        issues_with_users << IssueWithUser{
            item: issue
            user: user
        }
    }
    show_repo_link := false
    mut first := false
    mut last := false
    if repo.nr_open_issues > commits_per_page {
        offset := page_i * commits_per_page
        delta := repo.nr_open_issues - offset
        if delta > 0 {
            if delta == repo.nr_open_issues && page_i == 0 {
                first = true
            } else {
                last = true
            }
        }
    } else {
        last = true
        first = true
    }
    page_count := calculate_pages(repo.nr_open_issues, commits_per_page)
    prev_page, next_page := generate_prev_next_pages(page_i)
    ctx.set_page_title(['Issues', '${repo.user_name}/${repo.name}'])
    return $veb.html()
}

@['/:username/:repo_name/issue/:id']
pub fn (mut app App) issue(mut ctx Context, username string, repo_name string, id string) veb.Result {
    repo := app.find_repo_by_name_and_username(repo_name, username) or { return ctx.not_found() }
    issue := app.find_issue_by_id(id.int()) or { return ctx.not_found() }
    issue_author := app.get_user_by_id(issue.author_id) or { return ctx.not_found() }
    ctx.set_page_title(['${issue.title} #${issue.id}', '${repo.user_name}/${repo.name}'])
    mut comments_with_users := []CommentWithUser{}
    mut comment := Comment{}
    mut comment_author := User{}
    issue_comments := app.get_all_issue_comments(issue.id)
    mut i := 0
    for i = 0; i < issue_comments.len; i++ {
        comment = issue_comments[i]
        comment_author = app.get_user_by_id(comment.author_id) or { continue }
        comments_with_users << CommentWithUser{
            item: comment
            user: comment_author
        }
    }
    return $veb.html()
}

@['/:username/issues/:tab']
pub fn (mut app App) user_issues(mut ctx Context, username string, tab string) veb.Result {
    if !ctx.logged_in {
        return ctx.not_found()
    }
    if ctx.user.username != username {
        return ctx.not_found()
    }
    exists, user := app.check_username(username)
    if !exists {
        return ctx.not_found()
    }
    current_tab := if tab in ['assigned', 'created', 'mentioned', 'activity'] {
        tab
    } else {
        'created'
    }
    mut issues := match current_tab {
        'assigned' { []Issue{} }
        'mentioned' { app.find_user_mentioned_issues(user.username) }
        'activity' { app.find_user_recent_issues(user.id) }
        else { app.find_user_issues(user.id) }
    }

    mut issue_repo := Repo{}
    for mut issue in issues {
        issue_repo = app.find_repo_by_id(issue.repo_id) or { continue }
        issue.repo_author = issue_repo.user_name
        issue.repo_name = issue_repo.name
        issue.labels = app.get_issue_labels(issue.id)
    }
    mut issues_with_users := []IssueWithUser{}
    for issue in issues {
        issue_author := app.get_user_by_id(issue.author_id) or { continue }
        issues_with_users << IssueWithUser{
            item: issue
            user: issue_author
        }
    }
    tab_assigned_class := if current_tab == 'assigned' {
        'user-issues-sidebar__item user-issues-sidebar__item--active'
    } else {
        'user-issues-sidebar__item'
    }
    tab_created_class := if current_tab == 'created' {
        'user-issues-sidebar__item user-issues-sidebar__item--active'
    } else {
        'user-issues-sidebar__item'
    }
    tab_mentioned_class := if current_tab == 'mentioned' {
        'user-issues-sidebar__item user-issues-sidebar__item--active'
    } else {
        'user-issues-sidebar__item'
    }
    tab_activity_class := if current_tab == 'activity' {
        'user-issues-sidebar__item user-issues-sidebar__item--active'
    } else {
        'user-issues-sidebar__item'
    }
    show_repo_link := true
    tab_title := match current_tab {
        'assigned' { 'Assigned issues' }
        'mentioned' { 'Mentioned issues' }
        'activity' { 'Issue activity' }
        else { 'Created issues' }
    }

    ctx.set_page_title([tab_title, user.username])
    return $veb.html()
}